Agricultural machine, in particular a combine harvester and thresher, with multi-processor master unit

[0002] The invention relates to an agricultural machine, in particular a combine harvester and thresher, which is comprised of component devices with associated microprocessors, of which at least one is a control station processor with a control keypad and a screen, which microprocessors are connected to measurement, actuation, and/or display members of the respective component devices and regarding this, process data which comes up in the component device in a controlling and/or regulating manner, or in a manner which displays it; these microprocessors are connected to one another by a communications bus via conventional interface circuits and via these circuits, in accordance with a protocol, continuously transmit actual operating data which is relevant for each other, such as rpm, speed, time, etc., together with an identifier, which is specific to the operating data.

[0003] Gottschalk discloses a device of this kind in his article “Trouble Shooting” in the periodical [Z:] Landtechnik 47, pp. 71-vol. 74, 1992. A plurality of microprocessors are connected to communicate by means of a standard CAN-communications bus and are connected to measuring and actuating members of component devices, namely an engine, running gear, work unit, and a display device, as well as to a diagnostic processor, and process their data for controlling and regulating the subdomain functions, and exchange it on a priority basis and employ it diagnostically.

[0004] It is provided that the individual component devices, as needed, are each consulted for actual operating data such as rpm, speed, time, etc. by another respective, relevant component device. The transmission of data is carried out in accordance with a standard protocol, by means of conventional interface circuits, which also furnish a single-lead emergency operation instead of the usual dual-lead operation. In complex agricultural machines, in particular combine harvester and threshers, this type of on-demand data polling from the other component devices requires an extensive expenditure for enciphering and deciphering, which can lead to extended queuing and long message processing times in the processors, and under some circumstances to inadmissible down times of the actuating and regulating devices and to malfunctioning of the same.

[0005] Furthermore, DE 37 08 324 A1 discloses a microprocessor-controlled information device of an agricultural machine, which shows wiring data and operating data, which are each specified and determined actually by measurement; the terms displayed are taken from a speech vocabulary memory, which is consulted each time. A specification or selection of operation adjustment data and parts of the operating program is carried out with dialogue support via a numeric keypad and different control keys or buttons. The perception of spoken information during continuous operation demands an increased concentration and attentiveness of the operator, which thus takes away from his observation of the machine and path of travel.

[0006] Furthermore, the Philips data sheet 82C200, Preliminary Functional Description, pp. 4-7, discloses a bus interface component, which includes an acceptance filter subassembly, with which the identifiers are compared one after the other, whereupon only the messages whose identifiers correspond to one of the ones stored in memory are transmitted to the affiliated microprocessor. The times for the successively carried out comparisons are relatively high depending on the identifier number, and messages which have arrived in the meantime under some circumstances are not received and are lost, unless a higher-priority software organization sees to it that additional monitoring and rerequesting of the transmission of the same message is carried out. This means further time delays, so that in practical applications of agricultural machine technology, real-time communication was possible only if no more than a very low number of message types was exchanged.

[0007] It is the object of the invention to increase the capacity of the agricultural machine mentioned at the beginning, in particular of its master unit, to communicate between the processors and with the operator, while at the same time placing less of a physical demand upon the operator.

[0008] The embodiment is comprised in that in the individual microprocessors, by means of the respective identifier received, a key marker field is accessed in which the key markers of such operating data types, which are to be received in the appropriate microprocessor, are stored in memory, and whenever a key marker is found there, the relevant identifier, as well as the transmitted operating data affiliated with it, is received, stored, and processed, and in that in the control station processor, depending on its respective dialogue state, which is achieved according to the program by means of an operation of the control keypad and/or a selector switch with numerous switch positions, the operating data continually received in the control station processor, is transformed into analog pictograms, numeric depictions, and/or textual representations, each depending upon its identifier, and is adjusted by updating in at least one display field of a screen mask, which is associated with the respective dialogue state, is stored and thus a continually updated display or picture memory content is represented on the screen.

[0009] In an advantageous embodiment, the novel type of acceptance filtration requires only one memory access to the key marker field, which is laid out as a table in which the key markers of the permissible indicators are stored in memory as bits. If the table has a two-dimensional, byte-based configuration with 2048 bits for memory space reasons, then for an identifier test, an addressing of the table with an eight-bit address length and an access with three bits to a deciphering table for transformation from three-bit to one-out-of-eight is required, as well as a comparison operation of both results. These three operation steps are carried out parallel to further message reception so that after the completion of the message in the receiving buffer, if the buffered message is definitely intended for the microprocessor, it is taken practically without delay, hence in real time, and can be immediately processed.

[0010] As a result, it is possible to realize an instrumentation on the processor-controlled screen, with a display of actual operating data. A particular advantage is that the instrumentation depicted is adapted to each type of operation; but a similar basic structure of the display mask always remains, so that the operator has to do as little transforming mental work as possible, and a fixed place association is maintained by the screen for appointed operating states, which aids in safety.

[0011] By means of the high transmission capacity, it is also possible to communicate to the operator and insert onto the screen priority alarms and urgent bulletins, only the actual. information, which must be reacted to is in the operator's field of vision; the monitoring of the individual, critical components takes place automatically and is not displayed. The only data depicted on the screen visible in the cab is that which has to be influenced by the operator, depending upon the terrain and crop state. This data is the speed, the direction of travel and with it, the cutting width, the cutting unit height, and cutting unit pitch. All the functions mentioned are controlled in one-handed operation on the control stick, which is equipped with four buttons for cutting unit adjustment. The execution of control takes place by means of set-point value specifications, which are continually transmitted to the appropriate processors. To simplify the cutting unit adjustment, a particular program is provided, which makes possible the immediate selection of stored set-point values and of various regulating programs by means of the control stick buttons, but also achieves a change of the set-point values when necessary.

[0012] In an advantageous embodiment, it is provided that apart from or instead of via a menu preselection, set-point value specifications are to be initiated via a selector switch setting; depending on the particular selector switch position, a corresponding part of the operating program produces a transmission connection to the particular unit selected and actuates an appropriate pictogram and numerically represents the increased or decreased set-point value, by means of actuating a +/− key, which is preferably the rocker key provided, in a bar region between its permissible limit values.

[0013] During the direct set-point value specification, the cursor position and the menu state of the driving and harvesting display are each temporarily stored and upon a reversal in menu mode are preferably activated again and displayed by means of a corresponding adjustment of the selector switch.

[0014] The selector switch is preferably a rotary knob, whose middle position is provided for menu navigation and whose other positions are provided for set-point value determinations. These concern the set-point threshing drum rpm, set-point fan rpm, set-point spacing of the concave, set-point sensitivity of the sieve loss sensor, set-point sensitivity of a shaker loss sensor, set-point reel rpm, set-point lower sieve width, set-point upper sieve width, and/or set-point slat elevator rpm.

[0015] Each selected set-point value is extracted from the affiliated set-point value memory in the corresponding microprocessor and displayed and, upon specification of a change increment, is changed in the set-point value memory and acknowledged once more. The actual value, which is changed by means of the adjustment to it carried out, is continuously displayed as well so that there is a complete function control. In addition, the monitoring program works continuously, which signals an alarm if the actual value does not agree with the set-point value, or a long triggering or no triggering of the affiliated actuating member ensues. A display, acknowledgment, and storage of alarms takes place as in the menu-driven parts of the operating program.

[0016] Advantageous embodiments are recited in the dependent claims, described in detail in the drawing description, and shown in the drawings.

[0017] FIG. 1 schematically shows the acceptance filtration;

[0018] FIG. 2 shows a schematic general plan of a combine harvester and thresher with a multi-processor network and detail enlargements in various scales;

[0019] FIG. 3 shows a driving display mask;

[0020] FIG. 4 shows a harvesting display mask;

[0021] FIG. 5 shows an adjusting mask;

[0022] FIG. 6 shows an adjusting mask for slippage limit value specifications;

[0023] FIG. 7 shows a screen with operating switches.

[0024] FIG. 1 schematically shows the acceptance filtration of messages (ID, MES), which are received by one of the microprocessors. The message is serially written to a buffer memory by the bus (B) via a receiver circuit (ES), which produces the level conversion and synchronization, which memory is comprised of an identifier section, which receives the identifier (ID), and an operating data section, which receives the operating data (MES). If the receiver circuit (ES) sends an identifier complete signal (IDC), the identifier (ID), with a first, 11-bit identifier section (ID1), addresses the identifier memory (TB), which contains 256 bytes, so that a 1-byte word is present at its output, which word is supplied to an eightfold AND function (UG) to which three bits of a second identifier section (ID2), decoded to one-out-of-eight (a table (DES) can be used for this), are supplied, and whose output signals are combined in an OR function (OG), which, on the output side, controls the transmission of the identifier (ID) and the operating data message (MES), into a temporary storage area (FIFO) of the microprocessor (M1) as soon as the operating data message (MES) is completely received, which signals the receiver circuit (ES) with the message complete signal (MESC).

[0025] The functions shown in the form of hardware are preferably embodied to a large extent in accordance with the program in the microprocessor; the complete bulletins (IDC, MESC) serve to synchronize the operation of the buffer memory and the program. The transfer of the buffer content appropriately takes place as in the known interface circuits, each serially and in byte-based configuration, which is not shown in detail.

[0026] FIG. 2 shows a schematic general plan of a combine harvester and thresher having a microprocessor network with the bus (B). The control station processor (M1) is installed in the cab (1), and a second microprocessor (M2) is installed on the cutting unit (2) for cutting unit control and regulation, a third microprocessor (M3) is installed on the drive and running gear (3), a fourth microprocessor (M4) is installed on the threshing unit (4), a fifth microprocessor (MN) is installed on the feed- and cleaning unit (N), which supervises the flow of material. Each microprocessor (M1-MN) is connected to the central communications bus (B) via an interface circuit (SS). The control station processor (M1) drives the screen (V) and is driven by means of a control keypad (TA) with 7 keys (T9-T14) for screen dialogue operation as well as by means of cutting unit adjusting buttons (T15-T18) disposed ergonomically on the control stick (F).

[0027] The screen display areas are the time and date display (BF1), the driving speed display (BF2), the grain loss- and harvesting capacity display (BF3), the work width (partial width) display (BF4), the cutting height setting unit scale with the display of cutting height set-point values (BF5), the threshing drum rpm display (BF6), the fan rpm display (BF7), and the selection bar of the main menu (BF8). The key functions from the key field (TA) are the confirmation key (T9) for opening menus, for confirming the adjusting unit, and for starting and stopping tasks, the cursor key “Right” (T10), the cursor key “Left” (T11) for selecting menu items; using “Left”, one can navigate from the first menu item to the last item and vice versa; the +/− rocker key (T12) for adjusting values, the escape key (T13) for jumping back to the next higher menu level, and the help key (T14) for calling up explanatory text about the actual menu item. Further pressing of this help key leads back to the menu item. If the key is kept pressed longer, then the key function automatically repeats multiple times. On the control stick (F), there are the cutting unit lifter pushbutton (T15), pushbutton (T16) for lowering the cutting unit, pushbutton (T17) for turning on the automatic cutting height preselect system, and pushbutton (T18) for turning on the automatic contouring system.

[0028] The eight display or picture fields (BF1-BF8) are disposed on the screen (V), in which pictograms (P1) for analog depiction of operating data, numeric data (Z1) for numerical data output, and in other operating states, textual data are shown.

[0029] The display areas for time display (BF1) and for menu selection display (BF8) are always present in the same way, wherein the time and date are shown, continually updated by the electronic internal clock and the menu display is effected as a function of the key actuation of the control keypad (TA), by depicting the main menu display symbols in solid form if updated and otherwise in transparent form.

[0030] In the other display fields (BF2-BF7), various operating information appropriate to each menu item are shown. The starting point is always the driving display, FIG. 3, in which a tachometer is shown in the large display field on the left (BF2) and an operational load indicator is shown in the large display field on the right (BF3).

[0031] Using a first key selection, this menu item can be changed to a harvesting display, FIG. 4, where once again the tachometer is shown on the left and where in the large display field on the right (BF3), the grain loss rate and the harvesting capacity are continually shown in two triangular pictograms. The respective working width, cutting unit height selection, threshing drum rpm, fan rpm, and engine rpm with the engine load are shown and numbered in the small display fields (BF4-BF7) beneath the triangular pictograms.

[0032] From the driving display (FIG. 3) and the harvesting display (FIG. 4), one navigates hierarchically in submenus by means of further actuations of the keys, primarily as follows:

[0033] Main Menus

[0034] The submenus are subdivided further, as shown below in the table for adjusting:

[0035] Adjust

[0036] Adjust System Data

[0037] adjust rpm display

[0038] adjust language

[0039] adjust date and time

[0040] select combine harvester and thresher type

[0041] Adjust On-Board Information Unit

[0042] cutting unit width

[0043] working position

[0044] calibration travel distance factor

[0045] direct adjustment distance factor

[0046] storing the actual adjustment distance factor

[0047] Adjust RPM Monitor

[0048] adjust rpm

[0049] adjust permissible operational waste

[0050] adjust additional slippage

[0051] Adjust Contour

[0052] adjust end stops

[0053] adjust key/spring ratio

[0054] adjust the number of set-point values

[0055] adjust set-point values

[0056] Adjust Quantimeter

[0057] correction account of throughput factor

[0058] suggestion list of throughput factor

[0059] store current adjustment of the throughput factor.

[0060] The display layout is shown by way of example in FIG. 5, in the menu item “adjust system data, date and time”. The menu item is highlighted in negative typeface in the sixth display field (BF6) and the date, which has just been adjusted, is indicated with the highlighted key word “Day” in the third display field (BF3).

[0061] In addition to the depictions of normal operating data, overriding alarms and important bulletins are shown in the display fields (BF2-BF7), which are to be variably assigned.

[0062] Alarms are a particular form of higher priority bulletins. They produce an optical and acoustic signal, which must be acknowledged by the operator. The optical signal is comprised of a symbol and explanatory text and overlaps the previous screen content. After an acknowledgement, the alarm appears only as a bulletin.

[0063] The following alarms are defined:

[0064] RPM monitoring; the slippage exceeds a specified threshold value in:

[0065] threshing drum

[0066] fan

[0067] shaker

[0068] slat elevator

[0069] tailings elevator

[0070] chopper.

[0071] Alarm bulletins of on-line diagnosis are:

[0072] hardware module defect

[0073] sensor system module defect

[0074] actor system module defect

[0075] Bulletins are depicted as an optical symbol in the fourth to the seventh display field (BF4-BF7). Each bulletin symbol is displayed in a fixed position. In addition, a short beep is given.

[0076] The following bulletins are defined:

[0077] Service necessary (after 10 hours, 50 hours, 100 hours, 500 hours)

[0078] Chopper ON

[0079] Auto-contour status

[0080] Undervoltage

[0081] Overvoltage.

[0082] In order to achieve a rapid and simple priority control of the information exchanged on the communications bus, the identifiers are assigned to designated classes with three of their bit positions, as is shown in the table below. By means of a simple testing of these positions, the priority is determined as a function of the receipt of a message as a result of a positive acceptance test result and as a function of this priority, the affiliated message is used or placed in a queue. Thus it is assured that critical alarms can be communicated immediately.

[0083] Priority levels: bin

[0084] Some alarm bulletins are compiled in the table below:

[0085] Message Data Area

[0086] Alarm

[0087] On-Board Information Unit

[0088] threshing drum

[0089] fan

[0090] on-line diagnosis:

[0091] (actor system/sensor system)

[0092] cutting unit ON (switch)

[0093] RPM change (switch)

[0094] fan RPM

[0095] speed

[0096] engine RPM

[0097] threshing drum RPM

[0098] Alarm

[0099] RPM gauge

[0100] shaker

[0101] slat elevator

[0102] tailings elevator

[0103] grain elevator

[0104] chopper

[0105] on-line,diagnosis:

[0106] (actor system/sensor system)

[0107] shaker rpm

[0108] slat elevator rpm

[0109] tailings elevator rpm

[0110] grain elevator rpm

[0111] chopper rpm

[0112] Alarm

[0113] Contour

[0114] 2 byte Int.

[0115] on-line diagnosis

[0116] (actor system/sensor system)

[0117] automatic lowering machine ON (key)

[0118] magnet valve right

[0119] magnet valve left

[0120] magnet valve down

[0121] magnet valve up

[0122] contour ON (switch)

[0123] cutting height regulator ON (key)

[0124] actual value position

[0125] actual value right

[0126] actual value left

[0127] actual value, spring

[0128] set-point value of cutting height regulator

[0129] set-point value of automatic lowering machine

[0130] cutting unit switched OFF.

[0131] The rpm monitoring is carried out when the cutting unit is lowered and switched on and a minimal working rpm of the engine is achieved. Then the rpm of the individual, V-belt driven shafts in relation to the engine rpm is evaluated relative to the idling rpm ratio and tested to see whether a preset slippage has been exceeded. In the narrower sense, it consequently concerns a slippage monitoring. If the permissible slippage is exceeded, the appropriate alarm is signaled and displayed with the highest priority. After the acknowledgment of the alarm by means of a corresponding actuation of the confirmation key (T9), the bulletin remains in the display field, but the further generation of alarm bulletins and a continuous overloading of the communications path is prevented by the fact that the slippage tolerance limit is incrementally increased, while a corresponding increment adjust bulletin is given to the affiliated monitoring processor (M4) and evaluated by it. In addition, a corresponding bulletin is entered in a maintenance and repair instruction memory; this bulletin is deleted after the maintenance has been carried out in the maintenance mode, and the permissible slippage is also specified once again. The screen division which occurs in this connection for the menu item of the slippage specification for the threshing drum is shown in FIG. 6.

[0132] To synchronize the individual rpm measurements with the engine rpm, the latter is transmitted periodically to the other stations, functionally, every second.

[0133] Furthermore, the driving speed and the on-off state of the cutting unit are transmitted at short time intervals.

[0134] Moreover, the following messages are periodically exchanged by the control station processor (M1) with the drive and running gear microprocessor (M3):

[0135] Receiving:

[0136] partial width 1/1−1/4

[0137] working width

[0138] static radius×traverse

[0139] upper engine idling rpm

[0140] full-load engine rpm

[0141] Minimum working rpm

[0142] permissible slippage

[0143] Sent:

[0144] cultivated area

[0145] area yield

[0146] distance

[0147] work hours

[0148] operation hours

[0149] on-board network voltage

[0150] engine load

[0151] fan rpm

[0152] threshing drum rpm.

[0153] The latter data is used in particular for the output of harvesting and accounting information as well as for the setting up of a harvesting cadastre for the correlation of grain throughput data, which is determined and periodically sent out by the feed- and cleaning microprocessor (MN), and stored for continuous and accumulated output.

[0154] Continuous communication with short reaction times also takes place in particular between the control station microprocessor (M1) and the cutting unit regulator processor (M2), since the signals of the command buttons (T15-T18) on the control stick (F) must immediately be translated into control actions for setting the height and pitch of the cutting unit, since these are used for the optimal detection of grain of varying heights and/or grain which is at an angle or lying flat and for the prevention of damage to the cutting unit by stones or clumps of soil and, for prevention of an overloading of the feeder, for the respectively specified driving speed and cutting width, which are determined by the longitudinal or lateral pitch adjustment on the control stick (F).

[0155] In particular, the following periodic messages are provided for communications on the part of the cutting unit processor (M2):

[0156] Reception:

[0157] driving speed

[0158] incrementation or decrementation of the cutting height,

[0159] set-point values for the two automatic lowering machines

[0160] set-point value for the cutting height regulator

[0161] Transmission:

[0162] actual value of the automatic lowering machines

[0163] actual value of the right and left ground feeler

[0164] automatic contour system on-off

[0165] adjusting magnitudes of the automatic lowering machines on-off

[0166] adjusting magnitudes of the cutting height regulator on-off

[0167] Furthermore, alarms are sent with priority, which signal the exceeding of specified actual value limit values as well as malfunctions of the actuating members, the magnet valves of the hydraulic height and pitch adjusting devices.

[0168] The actual values are constituted of bearing pressure (measured at the cutting unit spring) and the ground clearance (measured via feeler). Hence the driver has the capability of smoothly adjusting the bearing pressure and the ground clearance of the cutting unit.

[0169] In addition to the height regulation, a lateral regulation is also active so that the cutting unit is guided parallel to the ground and the cutting height is constant over the entire width of the cutting unit. This lateral regulation compares the left and right ground clearance and when there are discrepancies, gives correction signals to the hydraulic system.

[0170] With the automatic lowering machine, the driver has the possibility of preselecting a cutting unit height of over 100 mm, for example. The preselected height is automatically set. During travel, the driver can switch back and forth between the automatic lowering machine program and the cutting height regulator program and can thus set different cutting unit heights at the push of a button. These function change-overs are mainly controlled via the buttons on the multi-function handle (F) of the control stick. The upper button (T17) is used to lift the cutting unit up from the automatic contour position range near the ground and into the cutting height range farther from the ground. The lower button (T18) is used to lower the cutting unit into the automatic contour adjustment, which can either be on the order of a specified cutting height preselection, or a specified cutting height regulation. This is decided only when an associated set-point value is adopted.

[0171] Two types of set-point value inputs are provided. In the first method, the set-point value can be changed by means of the +/− key (T12) of the keypad (TA). This changing of the set-point value can be adjusted in the work menu. The system supports the input in that the cursor is in the position corresponding to the automatic system that has been preselected by the driver with the button on the multi-function handle (F). The set-point value is incrementally adjusted by small increment widths (2.5%). The execution time is under one second. The terminal sends with it the message “increment” or “decrement” to the cutting unit microprocessor, (M2), which in turn answers with the new set-point value. The calculation of the new set-point value is thus carried out centrally in one location. Presetting of the set-point values (S11, S12; S21, S22), FIG. 4, is also possible in the Adjust Contour submenu.

[0172] The second method makes it possible for the driver to adopt the actual value as the new set-point value. To that end, the cutting unit is brought into the set position via the raising and lowering buttons (T15, T16), and then, by pressing the corresponding automatic-system button (T17, T18) for a long time (over 3 seconds), the actual value is adopted as the new set-point value. A short actuation of the switch, however, lowers the cutting unit into the automatic position, which is determined by the other set-point value, and the established set-point value is not changed. The decision whether the old set-point value should be retained afterward or the actual value should be adopted as the new set-point value is made only after the release of the switch.

[0173] The possibility is offered to the operator to reserve two set-point values (S11-S22), FIG. 4, display field (BF5), for each of the two regulation ranges. The driver can select via the Adjust Contour menu whether he will work with one or two set-point values. If two set-point values are stored, then one can change between them at the push of a button. This is advantageous when the grain is partially standing and partially prone, or is sharply sloped. The setting of one set-point value (S11, S21) is provided when the system is switched on. If two set-point values are selected, then the two set-point values (S11, S12; S21, S22) are also displayed, which at the beginning are disposed apart from each other by a standard difference.

[0174] Actuating one of the automatic buttons (T15-T18) switches back and forth between the different set-point values. If the corresponding automatic system was switched off, the old set-point value is taken as the first initial value. If there is massive ground contact of the cutting unit, and one of the feelers is deflected by at least 85%, an automatic emergency lifting takes place, e.g. an overriding of the stored set-point values, and an alarm is issued.

[0175] As with the cutting height regulator, the so-called contour regulator functions as a lateral pitch regulator with the corresponding set-point values and ground contact sensing informer so that parallel guidance of the cutting unit close to the ground remains guaranteed. The lateral regulation is practically always switched active. Its regulation precision (dead zone) comes to 6% when the cutting unit feeler is deflected only slightly, in which case the actual value lies in the upper third, and comes to 15% when the feeler is deflected greatly. If the set-point/actual deviation is greater than 20%, then the corresponding magnet valves are switched on at a 100% duty cycle. If the set-point/actual deviation is less than 20% and greater than 5%, then the corresponding magnet valves are pulsed at a 10% duty cycle, in an approximately one-second rhythm. When the deviation is less than 5%, the magnet valves are switched off. To increase the sensitivity of the set-point value preselection, the corresponding magnet valve is compensatingly actuated immediately after a set-point value adjustment already at a set-point/actual deviation of 2.5%.

[0176] Hence, as for the cutting unit regulation, standard adjustment values are specified, e.g. set-point and limit values, from which the operator can specify a change when there are operating conditions which diverge from the norm, this is therefore also the case for the other subassemblies of the combine harvester and thresher. Standard values of weight per liter at an average quality and average moisture for individual types of grain are stored for yield and loss measurement, which is why after switching on, the menu-driven selection of the type of grain must be carried out. At time intervals, moreover, externally determined weight per liter data can be input if there is no automatic weighing system. The data is transmitted into the yield and loss measuring microprocessor (MN) and is used there for the evaluation of measurement data, whereupon the results are continuously transmitted to the control station microprocessor (M1) and are entered there for the continuous output in the harvesting display in the pictogram of the display field (BF3) and are stored temporarily for evaluation and later output to a printer or a cassette (C). The grain loss measuring device also requires the input of the grain type for the sake of correlation of the signals measured; characteristic values are assigned to each grain type and are kept stored in memory.

[0177] If a loss value occurs that exceeds a specified limit value despite the regulation conditional optimizations, an alarm bulletin is given. By means of the conspicuous, very clear depiction of shaker loss in the left triangle and sieve loss in the right triangle of the display field (BF3) of the harvesting display mask, FIG. 4, the operator constantly has these important operating criteria in his field of vision so that he can continuously carry out a further optimizing by means of the respective suitable cutting width choice, driving speed adjustment, cutting height adjustment, and optionally sieve and fan adjustments.

[0178] The ergonomic disposition of the control stick (F) in grasping region of the right hand and that of the keypad (TA) in front of the right hand also allows an easy access during continuous operation to the stored information and the respecification of operational set-point values.

[0179] In the control station processor (M1), the processing of the incoming messages into the individual display fields takes place on two different program planes. An arriving message is first handled in an interrupt-controlled background program plane as follows:

[0180] If there is an alarm according to the identifier, the affiliated message is taken out of the buffer and an alarm marker is placed, and the message supply to the affiliated alarm display field (BF3) is decided on and noted in a display field memory, the beep is switched on, and the identifier is deleted as well.

[0181] If there is no alarm, but rather a bulletin, the bulletin which corresponds to the message is noted in a control field of the bulletin display field area (BF4) and a short beep is initialized and the identifier is deleted as well.

[0182] If there is neither an alarm nor a bulletin, and if a new display value has been presented, then the display variable is entered in the display field control memory affiliated with the respective display value and the identifier is deleted as well.

[0183] The processing of the display field control memory information takes place periodically in a background utility. In this, the individual display area contents are combined in a display memory and/or updated, depending upon the status information in the display field control memories.

[0184] If there is a change to the status of threshing unit-on, the harvesting display, FIG. 4, is supplied; if the new status is threshing unit-off, then the driving display, FIG. 3, is constructed.

[0185] If a state of the operating keys (T11-T18) is changed, the menu status memory is correspondingly updated and the affiliated display field status memories are provided with corresponding entries, or these memories are erased.

[0186] If an alarm has been confirmed by means of actuating a key, the alarm status of the alarm display field (BF3) is deleted in the affiliated display field status area and the beep is switched off.

[0187] After that, the new entries contained in the individual display field status memories are hierarchically evaluated on an overriding basis in comparison to alarm entries, bulletin entries, and general operating information, like new actual and set-point values and menu status changes, to control the changing of the display memory contents so that the display content is fully updated.

[0188] FIG. 7 shows a screen (V) with a pictogram bar, which is preferably laid out in the lower display field area (BF8), and activated when the selector switch (WS), which as a rotary knob, is disposed next to the keypad (TA) is brought into a specified set-point value position. The middle position (CB) of the selector switch (WS) is for the selection of the normal driving display or harvesting display operation with the menu selection. The individual pictograms concern the selection of set-point value specification to be established: set-point threshing drum rpm, set-point fan rpm, set-point spacing of the concave, set-point sensitivity of each sieve loss sensor, set-point sensitivity of a shaker loss sensor, set-point reel rpm, set-point lower sieve width, set-point upper sieve width, and/or set-point slat elevator rpm. The symbols are also disposed on the selector switch (WS) as the selection field (WF). The rpm set-point values act upon the actuating means of the variable gearing of the V-belt drive. The sieve width set-point values act upon the sieve width actuating means. The sensitivity set-point values influence the degrees of amplification and/or the threshold specifications of the measuring amplifiers of the loss sensors.

[0189] The actual value fed back by the actuating means mentioned or the set-point value contained in the selected set-point value memory is numerically displayed in a further partial display field (BF7) and is also shown as a bar graph (BD) between the two limits of the set-point values. In addition, the limit values are indicated on the ends of the bar fields and the bar field (BD) has a scale.

[0190] In addition, the symbol of the triggered actuating member is shown in the partial display field (BF7)—here, in the display for one case in which the lower sieve width would be selected. It is provided that in the case of overriding of the actuating means, the affiliated pictogram is highlighted, i.e., shown in a negative typeface.

[0191] In this connection, alarm bulletins which appear are dealt with in menu operation and displayed.

[0192] The use of the selector switch (WS) gives the operator who is unfamiliar with menu control the simple possibility of being able to carry out the set-point value specifications and actual value assessments and therewith the function influencing and monitoring in a manner entirely similar to how it is done in a traditional combine harvester and thresher.

[0193] In a further embodiment of the operating device, the keypad (TA) is only equipped with the two rocker keys (T12+, T12−), and two selection bars (WL1, WL2) are provided with selector keys for menu selection, which keys are provided with pictograms for main menu selection and for indexing and switching back and forth. Preferably the two selection bars (WL1, WL2) are disposed on both sides of the screen. Instead of a rotary knob, a button bar can also be provided as the selector switch (WS), parallel to the pictogram field (BF8).

[0194] An input device for a personal identification card (PIC) is disposed on the operating device as a security device.