Method and apparatus for controlling the amount of power supplied to a conditioning device

[0002] The present invention is concerned with a method and an apparatus for controlling the amount of power supplied to a conditioning device such as, for example, a heating device acting on the value of a predetermined physical parameter within an area in relation to a setting signal. In the following description, reference will be made to temperature control but the present invention may be also applied to the control of humidity, pressure, or any other physical parameter.

[0003] Changes in temperature in a house or building tend to be required at specific periods of the day. For example, in a cold environment, the temperature setting is lower for the night and higher at wake-up time. This produces an instant high electrical power demand coming from a multitude of houses around the same time, which results in problems for electricity supply companies.

[0004] Known in the art, there is the U.S. Pat. No. 4,228,511 of SIMCOE et al., describing a system and a method for limiting power demand and for temperature control. According to this invention, a room thermostatic control provides for automatic power defer, i.e. modification of load consumption of electrically energized heating and cooling systems during intervals when there is a peak load demand on the electrical supply system. During power defer ambient indoor temperature is controlled by set point adjustment to minimize discomfort, e.g. by pre-boosting, by ramped temperature deferral at controlled rates, and thereafter by ramped recovery at controlled rates to the reference, i.e. desired, temperature. A circuit sensing external conditions, e.g. outdoor temperature, indicative of power defer, is utilized to generate a power defer signal for enabling modification of the set point. Digital signals are stored for each of a plurality of consecutive real time intervals for heating and cooling modes. A real time clock is utilized to access the digital signals for the current time interval. During presence of a power defer signal set point variation is controlled in accordance to the relevant digital signals for each current time interval.

[0005] The following patents also describe different systems or methods for power demand control or temperature control: U.S. Pat. Nos. 4,100,428; 4,167,965; 4,228,511; 4,509,585; 4,909,041; 5,095,715; 5,285,963; 5,361,982; 5,501,268; 5,467,812; 5,678,626 and 5,682,949.

[0006] A drawback with the systems or methods of the prior art is that although some of them allow a deferring of the power demand when a peak load occurs, none of them is concerned with a method or a system for spreading over a time period and reducing in intensity the amount of power supplied to a conditioning device when a new setting signal is issued.

[0007] An object of the present invention is to provide a method and an apparatus for spreading over a time period and reducing in intensity the amount of power supplied to a conditioning device when a new setting signal is issued.

[0008] Another object of the present invention is to perform the above-mentioned spreading over a time period and reducing in intensity in a way where the discomfort for the user is controlled and limited.

[0009] According to the present invention, there is provided a method for controlling an amount of power supplied to a conditioning device acting on an actual value of a predetermined physical parameter within an area in relation to a setting signal, the method comprising steps of:

[0010] (a) monitoring the setting signal to detect a change thereof;

[0011] (b) if the monitoring of step (a) fails to detect the change of the setting signal, controlling the amount of power supplied to the conditioning device to maintain the actual value of the predetermined physical parameter within a range of desired values determined by the setting signal, and returning to step (a); and

[0012] (c) if the monitoring of step (a) detects a changed setting signal:

[0013] (i) determining a time period and a uniform amount of power required by the conditioning device to cause the actual value of the predetermined physical parameter to theoretically reach a new range of desired values corresponding to the changed setting signal;

[0014] (ii) establishing time-related upper and lower limit profiles HLV(t) and LLV(t) of the predetermined physical parameter for the time period determined in step (i), the upper and lower limit profiles HLV(t) and LLV(t) having respectively different starting values and converging toward the new range of desired values at an end of the time period, the actual value of the predetermined physical parameter being included in a range delimited by the starting values;

[0015] (iii) supplying the uniform amount of power determined in step (i) to the conditioning device;

[0016] (iv) monitoring the actual value of the predetermined physical parameter during the time period in view of the upper and lower limit profiles HLV(t) and LLV(t) to detect when the actual value of the predetermined physical parameter reaches one of the limit profiles HLV(t) and LLV(t);

[0017] (v) when the actual value of the predetermined physical parameter reaches one of the limit profiles HLV(t) and LLV(t), controlling the amount of power supplied to the conditioning device to cause the actual value of the predetermined physical parameter to follow substantially the limit profile HLV(t) or LLV(t) that has been reached for a remaining portion of the time period; and

[0018] (vi) monitoring time from a beginning of the time period and when the time period ends returning to step (a).

[0019] Preferably, the range of desired values is limited to a single desired value, the amount of power supplied to the conditioning device is limited to a maximum power amount, and, in step (i), the uniform amount of power is determined by steps of:

[0020] calculating a value A where A=(the single desired value−the actual value);

[0021] measuring an actual amount of power supplied to the conditioning device, and calculating a first percentage of the maximum power amount that represents the actual amount; and

[0022] calculating a second percentage of the maximum power amount where the second percentage=(the first percentage+(A*a power command error)), the uniform amount of power being determined as the second percentage of the maximum power.

[0023] Preferably, in step (ii), the time-related upper and lower limit profiles HLV(t) and LLV(t) are established by steps of:

[0024] determining whether the value A is positive or negative;

[0025] if the value A is positive, which means that the actual value of the predetermined physical parameter has to be raised, establishing:

[0026] the lower limit profile LLV(t) of step (ii) by means of the following equation: LLV(t)=the single desired value−((the time period−Δt)*(A+a predetermined tolerance margin)/the time period), Δt representing time elapsed since the beginning of the time period; and

[0027] the upper limit profile HLV(t) of step (ii) by means of the following equation: HLV(t)=the single desired value; and

[0028] if the value A is negative, which means that the actual value of the predetermined physical parameter has to be lowered, establishing:

[0029] the upper limit profile HLV(t) of step (ii) by means of the following equation: HLV(t)=the single desired value−((the time period−Δt)*(A−a predetermined tolerance margin)/the time period); and

[0030] the lower limit profile LLV(t) of step (ii) by means of the following equation: LLV(t)=the single desired value.

[0031] Preferably, in step (i), when a first changed setting signal is detected, the time period is determined in relation to a predetermined initialization value, and for each subsequent changed setting signal that is detected, the time period is upgraded by means of the following steps:

[0032] calculating the following equation:

[0033] the time period=a precedent time period+a gain*(a previous amount of power determined in step (i)−a predetermined fraction of the maximum power amount), where the gain and the predetermined fraction are fixed values determined by previous experimentations; and

[0034] comparing the time period with a range of acceptable time periods, if the time period is within the range of acceptable time periods then the time period is used, otherwise the time period is set to a closest value within the range of acceptable time periods.

[0035] Preferably, the steps (iii), (iv), (v) and (vi) are deferred at a time T1 to obtain the new range of desired values at a predetermined time T2, T1 being equal to T2 minus the time period; and the controlling of the step (b) is performed as long as steps (iii), (iv), (v) and (vi) are deferred.

[0036] According to the present invention, there is also provided an apparatus for controlling an amount of power supplied to an conditioning device acting on an actual value of a predetermined physical parameter within an area in relation to a setting signal, the apparatus comprising:

[0037] first monitoring means for monitoring the setting signal to detect a change thereof;

[0038] first controlling means for controlling the amount of power supplied to the conditioning device as long as the first monitoring means fails to detect the change of the setting signal, the first controlling means controlling then the amount of power to maintain the actual value of the predetermined physical parameter within a range of desired values determined by the setting signal; and

[0039] second controlling means for controlling the amount of power supplied to the conditioning device when the first monitoring means detects a changed setting signal, the second controlling means comprising:

[0040] first estimating means for estimating a time period and a uniform amount of power required by the conditioning device to cause the actual value of the predetermined physical parameter to theoretically reach a new range of desired values corresponding to the changed setting signal;

[0041] second estimating means for estimating time-related upper and lower limit profiles HLV(t) and LLV(t) of the predetermined physical parameter for the time period estimated by the first estimating means, the upper and lower limit profiles HLV(t) and LLV(t) having respectively different starting values and converging toward the new range of desired values at an end of the time period, the actual value of the predetermined physical parameter being included in a range delimited by the starting values;

[0042] supplying means for supplying the uniform amount of power determined by the first estimating means to the conditioning device;

[0043] second monitoring means for monitoring the actual value of the predetermined physical parameter during the time period in view of the upper and lower limit profiles HLV(t) and LLV(t) to detect when the actual value of the predetermined physical parameter reaches one of the limit profiles HLV(t) and LLV(t);

[0044] third controlling means for controlling the amount of power supplied to the conditioning device when the actual value of the predetermined physical parameter reaches one of the limit profiles HLV(t) and LLV(t), to cause the actual value of the predetermined physical parameter to follow substantially the limit profile HLV(t) or LLV(t) that has been reached for a remaining portion of the time period; and

[0045] third monitoring means for monitoring time from a beginning of the time period and, when the time period ends, returning the control of the amount of power supplied to the conditioning device to the first controlling means.

[0046] Preferably, the apparatus further comprising a third estimating means for estimating a power command error of the uniform amount of power estimated by the first estimating means by integrating, over the remaining portion of the time period, a difference between the amount of power supplied to the conditioning device during said remaining portion of the time period and the uniform amount of power estimated by the first estimating means so that when a next changed setting signal is detected, the first estimating means takes into account the power command error.

[0047] Preferably, the range of desired values is limited to a single desired value, the conditioning device is a heating device, the amount of power supplied to the conditioning device is limited to a maximum power amount, and the first estimating means for estimating the uniform amount of power comprises:

[0048] calculating means for calculating a value A where A=(the single desired value−the actual value);

[0049] measuring means for measuring an actual amount of power supplied to the heating device;

[0050] calculating means for calculating a first percentage of the maximum power amount that represents the actual amount; and

[0051] calculating means for calculating a second percentage of the maximum power amount where the second percentage=(the first percentage+(A*the power command error)), the uniform amount of power being determined as the second percentage of the maximum power;

[0052] Preferably, the second estimating means for estimating the time-related upper and lower limit profiles HLV(t) and LLV(t) comprises:

[0053] determining means for determining whether the value A is positive or negative;

[0054] establishing means for establishing the lower limit profile LLV(t) by means of the following equation: LLV(t)=the single desired value−((the time period−Δt)*(A+a predetermined tolerance margin)/the time period) if the value A is positive which means that the actual value of the predetermined physical parameter has to be raised, Δt representing time elapsed since the beginning of the time period; and

[0055] establishing means for establishing the upper limit profile HLV(t) by means of the following equation: HLV(t)=the single desired value if the value A is positive which means that the actual value of the predetermined physical parameter has to be raised;

[0056] establishing means for establishing the upper limit profile HLV(t) by means of the following equation: HLV(t)=the single desired value−((the time period−Δt)*(A−a predetermined tolerance margin)/the time period) if the value A is negative which means that the actual value of the predetermined physical parameter has to be lowered; and

[0057] establishing means for establishing the lower limit profile LLV(t) by means of the following equation: LLV(t)=the single desired value if the value A is negative which means that the actual value of the predetermined physical parameter has to be lowered.

[0058] Preferably, the first estimating means sets the time period in relation to a predetermined initialization value when a first changed setting signal is detected, and it comprises the following means for upgrading the time period for each subsequent changed setting signal that is detected:

[0059] calculating means for calculating the following equation:

[0060] the time period=a precedent time period+a gain*(a previous amount of power determined in step (i)−a predetermined fraction of the maximum power amount), where the gain and the predetermined fraction are fixed values determined by previous experimentations; and

[0061] comparing means for comparing the time period with a range of acceptable time periods, if the time period is within the range of acceptable time periods then the time period is used, otherwise the time period is set to a closest value within the range of acceptable time periods.

[0062] Preferably, the apparatus comprises deferring means for deferring operation of the supplying means, the second monitoring means, the third controlling means and the third monitoring means at a time T1 to obtain the new range of desired values at a predetermined time T2, T1 being equal to T2 minus the time period, the first controlling means being in operation as long as the operations of the supplying means, the second monitoring means, the third controlling means and the third monitoring means are deferred.

[0063] The objects, advantages and other features of the present invention will become more apparent upon reading of the following non-restrictive description of preferred embodiments thereof, given for the purpose of exemplification only with reference to the accompanying drawings.

[0064] FIGS. 1aand 1bare an algorithm showing a preferred embodiment of a method according to the present invention;

[0065] FIG. 2 is a block diagram of a preferred embodiment of the hardware environment into which the present invention is implemented;

[0066] FIG. 3 illustrates upper and lower diagrams showing respectively the power supplied to the heating device and the temperature versus time for an operating scenario according to the present invention;

[0067] FIG. 4 illustrates upper and lower diagrams showing respectively the power supplied to the heating device and the temperature versus time for another operating scenario according to the present invention;

[0068] FIG. 5 illustrates upper and lower diagrams showing respectively the power supplied to the heating device and the temperature verses time for another operating scenario according the present invention;

[0069] FIGS. 6a-6dillustrate an algorithm showing another preferred embodiment of a method according to the present invention;

[0070] FIG. 7 is a block diagram of another preferred embodiment of the hardware environment into which the present invention is implemented;

[0071] FIG. 8 illustrates upper and lower diagrams showing respectively the power supplied to the heating device and the temperature versus time for another operating scenario according the present invention;

[0072] FIG. 9 illustrates upper and lower diagrams showing respectively the power supplied to the heating device and the temperature versus time for another operating scenario according to the present invention;

[0073] FIG. 10 illustrates upper and lower diagrams showing respectively the power supplied to the heating device and the temperature versus time for another operating scenario according to the present invention;

[0074] FIG. 11 illustrates upper and lower diagrams showing respectively the power supplied to the heating device a the temperature versus time for another operating scenario according to the present invention; and

[0075] FIGS. 12a-12ean illustrate algorithm showing another preferred embodiment of a method according to the present invention;

[0076] In the following description, similar elements throughout the drawings are identified by the same reference numbers. Referring now to FIG. 1, there are shown the steps of a method according to the present invention. The method is for controlling the amount of power supplied to a conditioning device acting on the actual value of a predetermined physical parameter within an area in relation to a setting signal. In the following description, we will consider that the predetermined physical parameter is temperature, and that the conditioning device is a heating device but the invention can be applied to other physical parameters and other conditioning devices.

[0077] The method is presented as an algorithm. The algorithm is used to limit power demand when a change in the temperature setting for an area is issued. The algorithm can be applied with different settings respectively to several areas such as the rooms of a house. In the present application, we will consider that each of the areas is heated by electrical energy but other types of energy can be used.

[0078] The method comprises three main steps. The first step consists in (a) monitoring the setting signal to detect a change thereof. As long as no change is detected, step (b) is executed. But when a new setting signal is issued and detected then the algorithm proceeds to step (c).

[0079] As mentioned above, step (b) is executed as long as the monitoring of step (a) fails to detect a change of the setting signal. This step (b) consists in controlling the amount of power supplied to the heating device to maintain the actual value of the temperature within a range of desired values determined by the current setting signal. This step (b) is essentially the normal operating mode where the heating device is controlled to react to the conditions and no effort is directed to spread over time the amount of power supplied to the heating device.

[0080] Also as mentioned above, step (c) is executed when the monitoring of step (a) detects a changed setting signal. This step (c) consists in performing several substeps. The substeps of step (c) includes steps (i) to (vi). Step (i) consists in determining both a time period and a uniform amount of power required by the heating device to cause the actual value of the temperature to theoretically reach a new range of desired values corresponding to the changed setting signal. The time period may be a predetermined fixed time period or a variable time period that is reevaluated and modified every time step (c) is executed.

[0081] Step (ii) consists in establishing time-related upper and lower limit profiles HLV(t) and LLV(t) of the temperature for the time period determined in step (i). The upper and lower limit profiles HLV(t) and LLV(t) have respectively different starting values, and converge toward the new range of desired values at the end of the time period. The actual value of the temperature is included in the range delimited by the starting values. The limit profiles define a range of temperature values within which the actual temperature is confined during the heating period to optimize the power distribution over that period.

[0082] Step (iii) consists in supplying the uniform amount of power determined in step (i) to the heating device. Step (iv) consists in monitoring the actual value of the temperature during the time period , and comparing it to the upper and lower limit profiles HLV(t) and LLV(t) to detect when the actual value of the temperature reaches one of these limit profiles.

[0083] Step (v) consists in, when the actual value of the temperature reaches one of the limit profiles HLV(t) and LLV(t), controlling the amount of power supplied to the heating device to cause the actual value of the temperature to follow substantially the limit profile HLV(t) or LLV(t) that has been reached for the remaining portion of the time period.

[0084] Step (vi) consists in monitoring time from the beginning of the time period and returning to step (a) when the time period ends.

[0085] The present invention can be implemented in different environments for process or ambient control. A person skilled in the art will understand that the environment may be completely hardware or a combination of hardware and software. In the present description, a preferred embodiment of the invention will be described as a combination of hardware and software. The software is described by means of algorithms.

[0086] Referring now to FIG. 2, there is shown a block diagram of a preferred embodiment of an apparatus with its environment according to the present invention. The apparatus is for controlling the amount of power supplied to a heating device 26 acting on the actual value of a temperature within an area in relation to a setting signal.

[0087] The apparatus comprises a power profiler 2 and a controller 16 which are provided with appropriate softwares for implementing all the means described hereafter. These means can be implemented in different manners and it is believed that a person skilled in the art will understand how to implement these means from the teaching of the present application.

[0088] The apparatus comprises a first monitoring means for monitoring the setting signal to detect a change thereof. This first monitoring means is preferably implemented by a power profiler 2 which receives the setting signal at its input 36.

[0089] The apparatus also comprises a first controlling means. This first controlling means controls the amount of power supplied to the heating device 26 as long as the first monitoring means does not to detect a change in the setting signal. The first controlling means maintain the actual value of the temperature in the area within a range of desired values determined by the setting signal. This first controlling means is implemented by the controller 16, the temperature measuring device 28 which measure the temperature within the room and the power regulator 24 which applies high power signal to the heating device 26. The controller 16 receives the setting signal from output 4 of the power profiler 2. The power profiler 2 can activate/deactivate the controller 16 by means of its output 6.

[0090] The apparatus also comprises a second controlling means. This second controlling means controls the amount of power supplied to the heating device 16 when the first monitoring means detects a changed setting signal. This second controlling means is implemented by means of the power profiler 2 that operates then through the controller 16, the temperature measuring device 28 and the power regulator 22. When the second controlling means is in operation, the power profiler 2 deactivates the controller 16 and controls the power regulator 22 through the controller 16 which is now transparent for control signals sent from the power profiler 2 to the power regulator 22.

[0091] This second controlling means comprises a determining means for determining a time period and a uniform amount of power required by the heating device 26 to cause the actual value of the temperature to theoretically reach a new range of desired values corresponding to the changed setting signal. The second controlling means also comprises an establishing means for establishing the time-related upper and lower limit profiles HLV(t) and LLV(t) as explained above, for the time period determined by the determining means. Both the determining means and the establishing means are implemented by the power profiler 2.

[0092] The second controlling means also comprises a supplying means for supplying the uniform amount of power determined by the determining means to the heating device 26. The supplying is implemented by the power regulator 22.

[0093] The second controlling means further comprises a second monitoring means for monitoring the actual value of the temperature during the time period to detect when the actual value of the temperature reaches one of the limit profiles HLV(t) and LLV(t). This second monitoring means uses the temperature signal produced by the temperature measuring device 28 and received at the input 34 of the power profiler 2. The second monitoring means is implemented by means of the temperature measuring device 28 and the power profiler 2.

[0094] The second controlling means further comprises a third controlling means for controlling the amount of power supplied to the heating device when the actual value of the temperature reaches one of the limit profiles HLV(t) and LLV(t). The action of this third controlling means is to cause the actual value of the temperature to follow substantially the limit profile HLV(t) or LLV(t) that has been reached for the remaining portion of the time period. The third controlling means is also implemented by means of the power profiler 2.

[0095] The second controlling means also comprises a third monitoring means for monitoring time from the beginning of the time period and returning the control of the amount of power supplied to the heating device to the first controlling means when the time period ends. The return of the power control to the first controlling means implies that the controller 16 is reactivated. The third monitoring means is implemented by means of the power profiler 2.

[0096] In the embodiment shown in FIG. 2, the power profiler 2 has three outputs 4, 6 and 8 connected respectively to three inputs 10, 12 and 14 of the controller 16. Output 18 of the controller 16 is connected to input 20 of a power regulator 22. The controller 16 is an integrated controller 16, which means that it can be activated and deactivated by the power profiler 2. For this purpose, the power profiler 2 has an output 6 that generates a signal for activating/deactivating the controller 16 via the input 12 thereof. When the controller 16 is activated, it operates in proportional mode which means that the output signal generated by the output 18 of the controller 16 is in relation to a setting signal received at input 10.

[0097] When the controller 16 is deactivated, it operates in command mode which means that the power profiler 2 takes over the command of the power regulator 22 through the controller 16 which is then transparent. The output signal generated by the output 18 of the controller 16 is then only determined by the command signal received at input 14 from the power profiler 2.

[0098] The proportional mode is in operation as long as there is no change in the setting signal received at input 36, this setting signal being directly sent to the controller 16 via output 4. The command mode is initiated when there is a change in the setting signal received at input 36. Then, the output signal generated at the output 18 of the controller 16 is directly determined by the output 8 of the power profiler 2.

[0099] The output 24 of the power regulator 22 is connected to heating device 26. The temperature is measured by a temperature measuring device 28 which has an output 30 connected respectively to inputs 32 and 34 of the controller 16 and the power profiler 2. This way, the power profiler 2 and the controller 16 are informed in real time of the actual temperature in the area. The setting signal for the area is sent to the power profiler 2 via input 36. The power profiler 2 also receives a feedback signal from the output 18 of the controller 16 via its input 38 to monitor the output signal sent to the power regulator 22. The power regulator 22 sends a power signal to the heating device 26 via its output 24.

[0100] All the steps of the method according to the present invention are performed by the power profiler 2, the controller 16, the power regulator 22 and the temperature measuring device 28, and therefore all the means of the apparatus according to the present invention are embodied by the power profiler 2, the controller 16, the power regulator 22 and the temperature measuring device 28.

[0101] When the apparatus shown in FIG. 2 is first put into operation, an initialization of the variables necessary for the operation of the apparatus is done. After initialization, the apparatus performs the steps of the method by executing the loop shown in FIG. 1. The variables which have been initialized are modified in view of the operating conditions each time a loop is executed. The setting signal received via input 36 is an external variable introduced within the loop. The steps of the loop are repeated according to regular time steps.

[0102] Referring now to FIG. 3 which will be described in relation to FIG. 2, there is shown in the upper part thereof a diagram illustrating power along axis Y versus time along axis X, and in the lower part thereof a diagram illustrating temperature along axis Z versus time along axis X. Similar diagrams also appear in FIGS. 4, 5, 8, 9, 10 and 11. The operating scenario that will be described takes into consideration that the power profiler 2 can deactivate the controller 16 and that the time period ΔT allowed to change the actual temperature in view of a new setting signal is fixed. These operating conditions also apply to scenarios shown in FIGS. 4 and 5.

[0103] During time period A, no change in the setting signal for the area is detected, the controller 16 being activated and commanding the necessary power for the heating device 26 to maintain the temperature according to the setting signal. Time period A can be considered as a standby operating period.

[0104] As soon as a new setting signal is detected for the area, time period A ends and time period B begins. In this case the new setting signal indicates that the temperature has to be raised. During time period B, the controller 16 is deactivated and the power profiler 2, first, determines a uniform amount of power 5 to be supplied, and upper and lower limit profiles HLV(t) and LLV(t), and, second, commands the uniform amount of power 5 for the heating device 26. While the uniform amount of power 5 is supplied to the heating device 26, the actual temperature within the area increases.

[0105] After a while the actual temperature reaches the lower limit profiles LLV(t). The reaching of one of the limit profiles by the actual temperature ends time period B, and time period C begins.

[0106] During time period C, the controller 16 is brought back into operation and commands the necessary amount of power for the heating device 26 so that the actual temperature follows the limit profile that has been reached for the remaining portion of the time period ΔT. In this case the lower limit profile LLV(t) has been reached by the actual temperature which means that the uniform amount of power 5 determined by the power profiler 2 has been under estimated. During time period C, there is also performed a step of estimating the power command error of the uniform amount of power by integrating, over time period C, the difference between the amount of power supplied to the heating device 26 during time period C and the uniform amount of power determined by the power profiler 2. The area to be integrated is hatched in the upper diagram of FIG. 3. This step of estimating is performed by the power profiler 2. When a next changed setting signal is detected, the uniform amount is determined by the power profiler 2 by taking into account the power command error.

[0107] The end of time period ΔT also ends time period C, and time period D begins. During time period D the operating conditions are the same as those of time period A, which means that time period D can also be considered as a standby operating period.

[0108] Referring now to FIG. 4, it will be described in relation to FIG. 2. In this case the new setting signal indicates that the temperature has to be dropped. While the uniform amount of power 5 is supplied to the heating device 26, the actual temperature within the area decreases.

[0109] After a while the actual temperature reaches the lower limit profile LLV(t), which means that the uniform amount of power 5 determined by the power profiler 2 has been under estimated.

[0110] Referring now to FIG. 5, it will be described in relation to FIG. 2. In this case the new setting signal indicates that the temperature has to be dropped. While the uniform amount of power 5 is supplied to the heating device 26, the actual temperature within the area decreases.

[0111] After a while the actual temperature reaches the upper limit profile HLV(t), which means that the uniform amount of power 5 determined by the power profiler has been over estimated.

[0112] Referring now to FIG. 6 which will be described in relation to FIGS. 2 and 3, there is shown an algorithm showing a preferred embodiment of the method according to the present invention. In this example, the time period ΔT is a fixed time period of one hour. The controller 16 is an integrated controller 16, which means that it can be activated or deactivated by means of the power profiler 2.

[0113] The predetermined physical parameter to be controlled is the temperature of a room in a house. In this example, the new setting signal commands a raise of the temperature but the method can also be applied to a case where the new setting signal commands a drop of the temperature. The controller 16 is part of a thermostat. The heating device 26 is a baseboard heater located in the room. The thermostat is also provided with the temperature measuring device 28 for measuring the temperature in the room. The temporary values of the variables used throughout the algorithm are stored in RAM memories of the power profiler 2 and controller 16.

[0114] The occupant of the house sets a new desired temperature of 20° C. and a corresponding new setting signal is received at input 36 of the power profiler 2. The actual temperature is 18,3° C. and the previous setting signal was 18° C. The amount of power actually supplied to the heating device 26 to maintain the previous temperature of 18° C. represents 34% of the maximum power.

[0115] Before the first iteration within the loop shown in FIG. 6, the algorithm compares the new setting signal 20° C. to the previous setting signal of 18° C., 20° C.=18° C.±tolerance value?, sets a variable called new setting signal to 1 and memorizes it.

[0116] During the first iteration, as the variable called new setting signal has been set to 1, the response to the question step 11 is yes. The mode is set to 1 and stored. The algorithm also calculates the temperature difference between the new and previous setting signals and stores the result thereof in a variable called A, A=(20° C.−18,3° C.)=+1,7° C.

[0117] The response to question step 13 is also yes as the mode has been set to 1. Then, the algorithm determines whether the new setting signal means a temperature raise or a temperature drop. The algorithm compares the value A which is +1,7° C. to a tolerance value which is, for example, 0,5° C. As the result of the comparison is positive, the response to question step 15 is yes. But if the response had been no, the algorithm tests by means of question step 17 whether a temperature drop is requested by the occupant. If the response to the last question is still no, it means that the actual temperature is close to the desired temperature, within a range determined by the tolerance value of 0,5° C.

[0118] As the response to question step 15 is yes, the mode is set to 3 and memorized. The time period ΔT, the uniform amount of power to be supplied and the time-related upper and lower limit profiles HLV(t) and LLV(t) are determined by the power profiler 2. Also, the controller 16 is deactivated and the power profiler 2 takes over the control of the output signal sent to the power regulator 22 through the controller 16. The controller 16 is deactivated by a signal sent from output 6 of the power profiler 2 to input 12 of the controller 16. The calculation of the uniform amount of power is done by the following equation: (minimum(maximum (previous command %+gain*A), minimal command), maximum command))=(minimum(maximum (34%+18,8%/° C.*1,7° C.),0%), 100%)=66%. This means that the uniform amount of power is 66% of the available maximum power. The gain 18,8%/° C. is read from the RAM memory and is regularly adjusted every time the algorithm is executed by means of the learning for adjusting steps which will be described later on.

[0119] The time period ΔT is a predetermined time period of one hour, which means 3600 s. The occupant can decide whether he wants that the time period ΔT be started right away or be deferred so that the desired temperature be obtained later on at a specific time. In the present example, the period of time ΔT starts immediately. The algorithm calculates the theoretical time at which the applying of the uniform amount of power should be stopped. This time is equal to the actual time plus the time period ΔT. The actual time is set at 0 s so the time at which the applying of the uniform amount of power should stop is 3600 s. A timer is reset to 0 s every time the mode is set to 1. As shown in FIG. 3, the lower limit profile LLV(t) has a slope. This slope is determined by the following equation: (A+tolerance)/ΔT=(1,7° C.+0,5° C.)/3600 s=0,000611° C./s. As also shown in FIG. 3, the upper limit profile HLV(t) is a constant equal to 20° C. The first iteration of the loop is now terminated. The uniform amount of power supplied to the heating device 26 is 66% of the available maximum power. A new iteration of the loop is started every 10 s.

[0120] During the second iteration, the responses to question steps 11, 13, 19 and 21 are respectively no, no, no and yes because the setting signal has not changed since the first iteration and because the mode has been set to b 3 which indicates that a raise was requested by the occupant. We will describe the steps that are performed when the mode is set to 3 but one will understand that analogue steps as shown in FIG. 6 are performed when a temperature drop is requested by the occupant and the mode is set to 2.

[0121] The algorithm monitors the actual temperature in view of the upper and lower limit profiles HLV(t) and LLV(t) by means of question steps 23 and 25 to detect when the actual temperature reaches one of the limit profiles HLV(t) and LLV(t). To perform the question step 23, first, the lower limit profile LLV(t) is calculated and, second, it is compared with the actual temperature. The lower limit profile LLV(t) is defined by the following equation: the new setting signal−(time at which the applying of the uniform amount of power ends−actual time)*slope of the lower limit profile LLV(t)=20° C.−(3600 s−10 s)*0,000611° C./s=17,81° C. The actual temperature measured by the temperature measuring device is 18,4° C. As this temperature is higher than the lower limit profile LLV(t) and lower than the upper limit profile HLV(t), then the responses to question steps 23 and 25 are respectively no and no. This iteration is now terminated. The algorithm will test the actual temperature with respect to the lower and upper limit profiles LLV(t) and HLV(t) every 10 s and responses to question steps 23 and 25 will be no and no until the 255th iteration which occurs at 2550 s from the beginning.

[0122] At the beginning of the 255th iteration, the actual temperature is 19,35° C. and the mode is still set to 3. The calculation of the lower limit profile LLV(t) is now (20° C.−(3600 s−2550 s)*0,000611° C./s)=19,36° C. As the actual temperature 19,35° C. is now lower than the lower limit profile which is 19,36° C., then the response to the question step 23 is yes. Then, the mode is set to 4 and memorized. The amount of power supplied to the heating device 26 is controlled to cause the actual temperature to follow substantially the lower limit profile LLV(t) for the remaining portion of the time period ΔT. In practice, the control of the amount of power supplied to the heating device 26 is now returned to the controller 16. The command signal sent from output 4 of the power profiler to input 10 of the controller 16 is set with a slope of 0,000611° C./s, which is the slope of the lower limit profile LLV(t) so that the actual temperature will follow substantially the lower limit profile LLV(t) as shown in the lower diagram of FIG. 3. Also, the estimation of the power command error is initialized to 0,0% s. This iteration is now terminated.

[0123] During the 256th iteration, as the mode has been set to 4, the response to question step 27 is yes and the algorithm enters the learning for adjusting steps shown in the lower part of FIG. 6. The algorithm integrates the power command error by calculating the following equation: power command error=previous power command error+(the actual amount of power supplied to the heating device 26−the uniform amount of power previously calculated)*one time step=0,0% s+(66%−66%)*10 s. The result of this equation is 0,0% s at this time but in the following iterations while the actual amount of power supplied to the heating device 26 will increase to 100% the power command error will also increase, as shown in the upper diagram of FIG. 3.

[0124] Then, the algorithm tests the actual time with respect to the time limit ΔT by means of question step 29. At this time, the actual time is 2560 s and the time period ΔT is 3600 s, which means that the time period ΔT is not over yet. The setting signal sent from output 4 of the power profiler 2 to input 10 of the controller 16 is calculated by means of the following equation: setting signal=previous setting signal−(ΔT−actual time)* slope of the lower limit profile LLV(t)=20° C.−(3600 s−2560 s)*0,000611° C./s=19,37° C. This iteration is now terminated.

[0125] In the following iterations, the setting signal applied to input 10 of the controller 2 is regularly adjusted in view of the slope 0,000611° C/s. The actual temperature will reached 19,97° C. around the 361st iteration, which occurs at time 3610 s.

[0126] During the 361st iteration, the setting signal applied to input 10 of the controller 16 substantially reaches the desired temperature of 20° C. The mode is still set to 4 and the power command error=25200% s+(81%−66%)*10 s=25350% s. As the actual time 3610 s is now higher than the time period ΔT 3600 s, the response to question step 29 is yes. Then, the mode is set to 1 and memorized. The controller 16 is now activated by the fixed setting signal of 20° C. The gain of the algorithm is updated and improved by means of the power command error. The updated gain=minimum (maximum (previous gain+(power command error/(ΔT*A))*predetermined gain, minimum gain of the algorithm), maximum gain of the algorithm)=minimum (maximum (18,8%/° C.+(25350% s/(3600 s *1,7° C.))*2; 10%/° C.); 100%/° C.)=27,1%/° C. The predetermined gain is a stored variable having a value of determined by previous experimentations. The minimum and maximum gains of the algorithm are predetermined stored variables. The gain value of 27,1%/° C. is memorized. The variable A is set to 0 and this iteration is now terminated.

[0127] After the 361th iteration, the setting signal sent to input 10 of the controller 16 is 20° C., the controller 16 regulates the temperature within the room in view of this setting signal of 20° C. The signal sent from output 8 to input 14 of the controller 16 is set to 100% to allow a wide operating range for the controller 16. The setting signal set by the occupant is monitored every 10 s. Referring now to FIG. 7, there is shown a block diagram of another preferred embodiment of an apparatus with its environment according to the present invention. The apparatus is similar to that shown in FIG. 1, except that the controller 16 is not an integrated controller as in FIG. 2 but rather an external controller, which means that the controller cannot be deactivated. The command signal sent from output 8 of the power profiler 2 to input 14 of the controller 16 is a maximum command signal that limits the value of the output signal generated by the controller 16 at its output 18. Even if the controller 16 cannot be deactivated, in practice the power profiler 2 can take over the control of the output signal generated at output 18 of the controller 16 by sending appropriate setting and command signals to inputs 10 and 14 of the controller 16.

[0128] As long as there is no change in the setting signal received at input 36, said setting signal is sent directly to input 10 of the controller 16 and the maximum command signal sent to input 14 is set to 100%. The controller 16 generates the proper output signal at its output 18 in view of the setting signal received at its input 10 and the temperature signal received at its input 32 to control the actual temperature within the area.

[0129] When there is a change in the setting signal received at input 36, the power profiler 2 takes over the control of the output signal generated at the output 18 of the controller 16 by sending appropriate setting and maximum command signals to inputs 10 and 14 of the controller 16.

[0130] Referring now to FIG. 8, it will be described in relation to FIG. 7. The operating scenario that will be described takes into consideration that the power profiler 2 cannot deactivate the controller 16 but can control the output signal generated at output 18 through the controller 16, and that the time period ΔT allowed to change the actual temperature in view of a new setting signal can be regularly upgraded. These operating conditions also apply to scenarios shown in FIGS. 9, 10 and 11.

[0131] During time period A, no change in the setting signal of 18° C. for the area is detected, the controller 16 commanding the necessary power for the heating device 26 to maintain the temperature according to the setting signal received at input 10. The actual temperature is 18,3° C. The power profiler 2 applies a maximum command signal 100% to input 14 of the controller 16 to allow a high potential power 3 so that the controller 16 can operate within a wide operating range to maintain the temperature according to the setting signal received at input 10. Time period A can be considered as a standby operating period.

[0132] As soon as a new setting signal is detected for the area, time period A ends and time period B begins. In this case the new setting signal of 20,0° C. means that the temperature has to be raised. During time period B, the power profiler 2, first, determines a uniform amount of power 5 to be supplied, and upper and lower limit profiles HLV(t) and LLV(t), and, second, provides the appropriate setting and maximum command signals to input 10 and 14 of the controller 16 to supply the uniform amount of power 5 to the heating device 26. The upper limit profile HLV(t) is set to be equal to 20,0° C. The setting signal 7 applied to input 10 of the controller 16 corresponds to the setting signal of 20° C. received at input 36 for the whole of the time period ΔT.

[0133] While the uniform amount of power 5 is supplied to the heating device 26, the actual temperature within the area increases. After a while the actual temperature reaches the upper limit profile HLV(t). The reaching of one of the limit profiles by the actual temperature ends time period B, and time period C begins.

[0134] During time period C, the power profiler 2 applies the maximum command signal to input 14 of the controller 16 so that the controller 16 can operates to its full potential which is up to the high potential power 3. The controller 16 commands the necessary amount of power for the heating device 26 so that the actual temperature follows substantially the limit profile that has been reached for the remaining portion of the time period ΔT. In this case the upper limit profile HLV(t) has been reached by the actual temperature which means that the uniform amount of power 5 determined by the power profiler has been over estimated.

[0135] Referring now to FIG. 9, it will be described in relation to FIG. 7. In this case the new setting signal indicates that the temperature has to be raised. The upper limit profile HLV(t) is set to be equal to the setting signal received at input 36. The setting signal 7 applied to input 10 of the controller 16 corresponds to the setting signal received at input 36 for time period B only. For the remaining portion of the time period ΔT, which is time period C, the setting signal 7 applied to the input 10 is set to fit the lower limit profile LLV(t).

[0136] While the uniform amount of power 5 is supplied to the heating device 26, the actual temperature within the area increases. After a while the actual temperature reaches the lower limit profile LLV(t), which means that the uniform amount of power 5 determined by the power profiler has been under estimated.

[0137] Referring now to FIG. 10, it will be described in relation to FIG. 7. In this case the new setting signal indicates that the temperature has to be dropped. The lower limit profile LLV(t) is set to be equal to the new setting signal received at input 36. During time period B, the setting signal 7 applied to the input 10 is set to fit the value of the setting signal received at input 36 during previous time period A. For the remaining portion of the time period ΔT, which is time period C, the setting signal 7 is set to fit the lower limit profile LLV(t).

[0138] While the uniform amount of power 5 is supplied to the heating device 26, the actual temperature within the area decreases. After a while the actual temperature reaches the lower limit profile LLV(t), which means that the uniform amount of power 5 determined by the power profiler has been under estimated.

[0139] Referring now to FIG. 11, it will be described in relation to FIG. 7. In this case the new setting signal indicates that the temperature has to be dropped. The lower limit profile LLV(t) is set to be equal to the new setting signal received at input 36. During time period B, the setting signal 7 applied to the input 10 is set to fit the value of the setting signal received at input 36 during previous time period A. For the remaining portion of the time period ΔT, which is time period C, the setting signal 7 is set to fit the upper limit profile HLV(t).

[0140] While the uniform amount of power 5 is supplied to the heating device 26, the actual temperature within the area decreases. After a while the actual temperature reaches the upper limit profile HLV(t), which means that the uniform amount of power 5 determined by the power profiler has been over estimated.

[0141] Referring now to FIG. 12 which will be described in relation to FIGS. 7 and 8, there is shown an algorithm showing another preferred embodiment of the method according to the present invention. In this example, the time period ΔT is a time period that is upgraded every time the algorithm is executed. The controller 16 is an external controller 16, which means that it cannot be deactivated by the power profiler 2. Because of that, when according to the algorithm the power profiler 2 takes over the control of the amount of power supplied to the heating device 16, the controller 16 is not deactivated but rather controlled by the power profiler 2 which applies appropriate signals to inputs 10 and 14 of the controller 16 so that the resulting signal generated at output 18 of the controller 16 is in fact controlled by the power profiler 2.

[0142] In this example, the new setting signal commands a raise of the temperature but the method can also be applied to a case where the new setting signal commands a drop of the temperature. The temporary values of the variables used throughout the algorithm are stored in RAM memories of the power profiler 2 and controller 16.

[0143] The occupant of the house sets a new desired temperature of 20° C. and a corresponding new setting signal is received at input 36 of the power profiler 2. The occupant also specifies that this temperature of 20° C. should be delivered in four hours, the actual time being 01 hr:30 min PM. The actual temperature is 18,3° C. and the previous setting signal was set to 18° C. The amount of power actually supplied to the heating device 26 to maintain the previous temperature of 18° C. represents 34% of the maximum power. The current operating mode of the algorithm is 1. Variable A has a current value of 0. The control of the amount of power applied to the heating device is done by the controller 16, and a maximum command of 100% is applied to input 14 thereof by the power profiler 2. The previous setting signal of 18° C. is currently applied to input 10 of the controller 16.

[0144] Before the first iteration within the loop shown in FIG. 12, the algorithm compares the new setting signal 20° C. to the previous setting signal of 18° C., sets a variable called new requested setting signal to 1, memorizes it and calculates the time T1 at which the temperature of the area should reach the value of 20° C., T1=actual time+delay=01 hr:30 min PM+4 hr=05 hr:30 min PM.

[0145] As the variable called new requested setting signal has been set to 1, the response to the question step 39 is yes. Then the algorithm calculates the time T2 at which the power profiler 2 must take control of the amount of power supplied to the heating device 26, T2=T1−ΔT=05 hr:30 min PM−01 hr:08 min=04 hr:22 min PM, the value of ΔT being the last value thereof evaluated and memorized during the precedent execution of the algorithm, or, if this is the first execution of the program, memorized during the initialization of the system.

[0146] The responses to question steps 41 and 13 are respectively no and yes because it is not the time yet to start the power profiler 2 and the current mode is 1. Then the value A is compared with a tolerance value TOL of 0,5° C., A>0,5° C.=?, to see whether a temperature raise has been requested, by means of question step 15. As A has a value of 0, the response is no. The value A is also compared with the tolerance value TOL, A<0,5° C=?, to see whether a temperature drop has been requested, by means of question step 17. As A has a value of 0, the response is still no. Then, the command signal applied to input 10 of the controller 16 is maintained to 100% and the value of A is maintained to 0. This terminates the first iteration of the loop. A new iteration of the loop is started every 10 s.

[0147] For the second iteration, the responses to question steps of 11, 39, 41, 13, 15 and 17 are respectively no, yes, no, yes, no and no. The results of the calculations performed in this second iteration are the same as those obtained during the first iteration. The same results will be obtained for the next iterations until the 1212th iteration.

[0148] For the 1212th iteration which is obtained at a time of 04 hr:22 min PM plus a few seconds, the responses to question steps 11 and 39 are still no and yes but the response to question step 41 is now yes because the time at which the power profiler 2 should be started, 04 hr:22 min:00 s PM, is now smaller than the actual time 04 hr:22 min: 03 s PM. Then the variable called new requested setting signal is set to 0, the variable A is calculated by means of the equation: A=new setting signal−actual temperature=(20° C.−18,3° C.)=+1,7° C., and the mode is set to 1. All of these variables are stored.

[0149] The response to question step 13 is yes as the mode has been set to 1. Then, the algorithm determines whether the new setting signal means a temperature raise or a temperature drop. The algorithm compares the value A which is +1,7° C. to a tolerance value which is 0,5° C., A>0,5° C.=?. As the result of the comparison is positive, the response to question step 15 is yes. But if the response had been no, the algorithm tests by means of question step 17 whether a temperature drop is requested by the occupant.

[0150] As the response to question step 13 is yes, the mode is set to 3 and memorized. The time period ΔT, the uniform amount of power to be supplied and the time-related upper and lower limit profiles HLV(t) and LLV(t) are determined by the power profiler 2. The power profiler 2 takes over the control of the output signal sent to the power regulator 22 by controlling inputs 10 and 14 of the controller 16. The calculation of the uniform amount of power is done by the following equation: (minimum(maximum (previous command %+gain*A), minimal command), maximum command))=(minimum(maximum (34%+18,8%° C.*1,7° C.),0%), 100%)=66%. This means that the uniform amount of power is 66% of the available maximum power. This value of 66% is applied to input 14 of the controller 16. The gain 18,8%/° C. is read from the RAM memory and is regularly adjusted every time the algorithm is executed by means of the learning for adjusting steps.

[0151] As mentioned above, the value of ΔT is the last value thereof evaluated and memorized during the precedent execution of the algorithm. The calculation of ΔT will be described later on. In this case, the occupant decided that time period ΔT be deferred so that the desired temperature be obtained later on at 5 hr:30 min PM. As shown in FIG. 8, the lower limit profile LLV(t) has a slope. This slope is determined by the following equation: (A+tolerance)/ΔT=(1,7° C.+0,5° C.)/3600 s=0,000611° C./s. As also shown in FIG. 8, the upper limit profile HTV(t) is a constant equal to 20,0° C. The 1212th iteration of the loop is now terminated. The uniform amount of power supplied to the heating device 26 is 66% of the available maximum power.

[0152] During the 1213th iteration, the responses to question steps 11, 39, 13, 19 and 21 are respectively no, no, no, no and yes because the mode has been set to 3 which indicates that a raise was requested by the occupant. We will describe the steps that are performed when the mode is set to 3 but one will understand that analogue steps as shown in FIG. 12 are performed when a temperature drop is requested by the occupant and the mode is set to 2.

[0153] The algorithm monitors the actual temperature in view of the upper and lower limit profiles HLV(t) and LLV(t) by means of question steps 23 and 25 to detect when the actual temperature reaches one of the limit profiles HLV(t) and LLV(t). This part of the algorithm is similar to the corresponding part of the algorithm shown in FIG. 6. The algorithm will test the actual temperature with respect to the lower and upper limit profiles LLV(t) and HLV(t) every 10 s and responses to question steps 23 and 25 will be no and no until the 1249th iteration.

[0154] At the beginning of the 1249th iteration, the actual time is 4 hr:58 min PM, the actual temperature is 20,10° C. and the mode is still set to 3. The calculation of the lower limit profile LLV(t) is now (20° C.−(5 hr:30 min PM−4 hr:58 min PM)*0,000611° C./s)=18,84° C. The upper limit profile HLV(t) is 20° C. The actual temperature 20,10° C. is now higher than the upper limit profile, then the response to the question step 25 is yes. Then, the mode is set to 4 and memorized. The amount of power supplied to the heating device 26 is controlled to cause the actual temperature to follow substantially the upper limit profile HLV(t) for the remaining portion of the time period ΔT, which is until 5 hr:30 min PM. In practice, the control of the amount of power supplied to the heating device 26 is now returned to the controller 16. The command signal sent to input 14 of the controller 16 is set to 100%, and the signal sent to input 10 of the controller 16 is set to 20° C. so that the actual temperature will follow substantially the upper limit profile HLV(t) as shown in the lower diagram of FIG. 8. Also, the estimation of the power command error is initialized to 0,0 s. At the end of this iteration, the measured temperature and the actual amount of power supplied to the heating device are respectively 20,1° C. and 83% of the maximum amount of power.

[0155] During the 1250th iteration, as the mode has been set to 4, the response to question step 27 is yes and the algorithm enters the learning for adjusting steps shown in the lower part of FIG. 12. The algorithm integrates the power command error by calculating the following equation: power command error=previous power command error+(the actual amount of power supplied to the heating device 26−the uniform amount of power previously calculated)*one time step=0,0% s+(83%−66%)*10 s. The result of this equation is 170,0% s.

[0156] Then, the algorithm tests the actual time, 4 hr:59 min:14 s PM, with respect to the time limit of 5 hr:30 min PM by means of question step 29. At this time, the time limit of 5 hr:30 min PM has not been reached yet. The setting signal sent from output 4 of the power profiler 2 to input 10 of the controller 16 is calculated by means of the following equation: setting signal=previous setting signal−(time limit−actual time)* slope of the upper limit profile HLV(t)=20° C.−(5 hr:30 min PM−4 hr:59 min:14 s PM)*0,000000° C./s=20,00° C. This iteration is now terminated.

[0157] In the following iterations, the setting signal applied to input 10 of the controller 2 is maintained to 20° C. The 1440th iteration will occur at 5 hr:30 min: 08 s.

[0158] During the 1440th iteration, the mode is still set to 4 and the power command error=−7680% s+(44%−66%)* 10 s=−7900% s. As the actual time 5 hr:30 min:08 s PM is now later than the time limit 5 hr:30 min PM, the response to question step 29 is yes. Then, the mode is set to 1 and memorized. The controller 16 is returned to its normal operation mode by applying a 100% signal to its input 14, and by applying a fixed signal of 20° C. to its input 10. The gain of the algorithm is updated and improved by means of the power command error. The updated gain=minimum (maximum (previous gain−(power command error/(ΔT*A))* predetermined gain+(setting signal−actual temperature)*((previous gain*predetermined gain)/A); minimum gain of the algorithm), maximum gain of the algorithm)=minimum (maximum (18,8%/° C.−(7900% s/(4080 s *1,7° C.))*2+(20° C.−20.1° C.)*((18,8%/° C.*2)/1.7° C.); 10%/° C.); 100%/° C.)=14,3%/° C. The predetermined gain is a stored variable having a value of 2 determined by previous experimentations. The minimum and maximum gains of the algorithm are predetermined stored variables. The updated gain value of 14,3%/° C. is memorized. The variable A is set to 0.

[0159] Also in this iteration, the time period ΔT is updated in view of certain results of the present execution of the algorithm, according to the following equation: updated time period ΔT=minimum(maximum(previous time period ΔT−fraction of desired available command*available power−absolute value of( uniform amount of power−previous command))*predetermined gain of the algorithm regarding time; minimum time period ΔT); maximum time period ΔT)=minimum(maximum(01 hr:08 min−(0.5*66%−absolute value of (66%−34%))*18 s%; 00 hr:30 min); 01 hr:30 min)=01 hr:07 min:42 s. The fraction of desired available command, the predetermined gain of the algorithm regarding time and the minimum and maximum time periods ΔT are predetermined stored variables. This iteration is now terminated.

[0160] After the 1440th iteration, the setting signal sent to input 10 of the controller 16 is 20° C., the controller 16 regulates the temperature within the room in view of this setting signal of 20° C. The signal sent from output 8 to input 14 of the controller 16 is set to 100% to allow a wide operating range for the controller 16. The setting signal set by the occupant is monitored every 10 s.

[0161] We will now present, as preferred embodiments, different softwares that can be used for implementing the present invention. All of these softwares are in HP BASIC 6.2 code.

[0162] The next software is implemented in the power profiler 2 shown in FIGS. 2 and 7 to realize exponential filtering that is used for filtering signals received at inputs 34 and 38:

[0163] Although the present invention has been explained hereinabove by way of preferred embodiments thereof, it should be pointed out that any modifications to these preferred embodiments, within the scope of the appended claims is not deemed to change or alter the nature and scope of the present invention.