Abstract:
An on-board computer system for a work vehicle having an actuator. The computer system comprises an electronic control unit that is connected to and controls the actuator, a display unit and an input unit. The display unit displays operating parameters of the work vehicle. Through the input unit the operator inputs operating parameters of the work vehicle. The control unit transmits control signals to the actuator and can be operated selectively in a first operating mode and in a second operating mode. In the first operating mode the control unit displays a greater number of operating parameters that can be changed by the input unit than in the second operating mode.

Description:
FIELD OF THE INVENTION 
   The present invention is directed to an on-board computer system for a work vehicle having two operating modes for operators of different levels of training. In the first operating mode the control unit displays a greater number of operating parameters that can be changed by an input unit than in the second operating mode. 
   BACKGROUND OF THE INVENTION 
   DE 40 29 312 A describes an optical display assembly for a vehicle in which operating data is projected onto a windshield of the vehicle. The data to be displayed are selected either by an operating mode switch connected to a control assembly which is also used for the selection of the operating mode of the machine or automatically as a function of the significance of the data, in which the data is compared to pre-determined boundary values and is displayed when these boundaries are crossed. An operating mode is displayed at all times and the corresponding operating value is displayed as well. 
   DE 200 13 646 U proposes a computer display for a forest products or an agricultural machine in which an input is performed on an additional, relatively large membrane keyboard. The membrane keyboard may also be equipped with input keys. The data to be displayed, the input keys and the size and color of the data can be selected. 
   EP 1 031 263 A concerns an assembly for the adjustment of operating parameters for the control of agricultural machines. The assembly includes a control and regulating unit that is connected to an operator&#39;s terminal, sensors and actuators. With the operator&#39;s terminal an operator can provide the operating parameters of the machine as input. The operating terminal is also equipped with a display element. Various operating modes are proposed for the control and regulating unit. In addition to a so-called normal operating mode, at the first operating sequence, for example, an adjustment mode is provided in which parameters can be provided as input. In the case of a failure of the operating terminal an emergency operating mode is provided that can also be activated by means of a switch. In the emergency operating mode inputs can be provided by sensors that are normally used for the detection of operating data of the machine. The type of the displays and the possible inputs for the various modes is not specified in any further detail. 
   Agricultural harvesting machines, particularly combines, are relatively complex machines with a relatively high number of crop processing assemblies whose operating parameters must be adjusted to conform to the immediate harvesting conditions. The adjustments are relatively critical since they all strongly affect the results of the operation. In actual machines the adjustable crop processing assemblies are adjusted or controlled electronically by a control assembly that includes one or more microprocessors distributed over the machine. The immediate operating parameters can be recalled through display assemblies and changed by means of input devices. While experienced operators as a rule have no trouble in reading all operating parameters that are available and to change these if a change is useful, less experienced operators are frequently overwhelmed by the large number of operating parameters displayed. They also are frequently not in a position to perform meaningful inputs. 
   SUMMARY OF THE INVENTION 
   It is an object of the present invention to provide a control assembly for a work vehicle that can be operated successfully by operators with varying degrees of training and/or prior experience. 
   The invention proposes that the control assembly be operable selectively in at least a first and a second operating mode. In a first operating mode, that is particularly appropriate for experienced operators, a large number of operating parameters of the work vehicle can be displayed and/or changed by inputs. The second operating mode is appropriate particularly for operators with little experience and permits a display and/or input of considerably fewer operating parameters than the first operating mode. As a rule at least one operating parameter is displayed. An input possibility is not necessarily required in the second operating mode. 
   In this way the experienced operator is offered all possible adjustments, while a beginner is offered a choice of simple operations. Further operating modes are also conceivable whose degree of difficulty lies between that of the first and the second operating mode. 
   The operating parameters that can be reproduced on the display assembly as a rule are values to which actuators are adjusted and/or measured values of sensors or values derived from these. As a rule information about an operating parameter (its name or an abbreviation) is displayed along with the current value. Operating parameters that can be provided as input may be values to which an actuator is adjusted or desired operating results such as, for example, grain losses or other target inputs. The control assembly controls the actuator or the actuators as a function of the operating parameters that have been provided as input. In those cases in which specific operating parameters have not been provided as input, particularly in the second operating mode, the control assembly reverts to calculated values and/or values stored in memory for the operating parameters. Thereby measured values from sensors can also be considered. In both operating modes inputs that can be changed by the operator can be displayed that are based on calculated and/or stored values. 
   The operating mode is preferably selected on the basis of information depending on the particular operator. In this way the names of the possible operators can be stored in memory in a table along with the operating modes associated with these names. Following the input of the name, the operating mode is selected automatically. The system can also be secured by passwords. In a simpler form of the configuration the operating mode is selected by the operator. 
   Information considered by the control assembly that corresponds to the operating parameters of the work machine in the various operating modes that can be displayed or changed, may be permanently stored in memory. An input or a possible change may be provided by the operator or after an input of a special password. 
   In one embodiment the language in which the information is reproduced on the display can be selected. For this purpose the data necessary for a display are stored in memory under various addresses. On the basis of the selected, desired language the data needed for the display of information are recalled from memory at the corresponding address. The language may be specific to the site or specific to the country or may be changed by the operator (if necessary, after a password input). 
   The operating parameters that can be displayed frequently have varying degrees of significance to the operator. In that way the temperature inside the cab is less important than the crop throughput. The temperature of the engine is also basically less interesting as long as it does not exceed or fail to reach a limit value. In order to be able to bring to the operator&#39;s attention particularly important operating parameters, an obvious solution therefore is the use of a colored display assembly and to select the color of the operating parameters displayed according to the importance of the particular parameter. Important operating parameters may be shown continuously in signaling colors, for example, red, or only if a certain limit value is exceeded. The operating parameters that can be displayed are thereby associated with their importance and/or color information. 
   The on-board computer system according to the invention is appropriate for any desired work machine, for example, forest products, agricultural or construction machines. In view of the problems cited above of the high number of actuators, that may require relatively complex displays, which could possibly overwhelm less experienced operators, it is particularly appropriate for harvesting machines in which the actuator or the actuators are provided for the adjustment of crop processing assemblies. 
   In harvesting machines it may depend on the particular variety of grain to be harvested which operating parameters are of particular interest to the operator. In that way in the case of a first variety of grain the slot of the thresher drum may be particularly critical, while with a second variety of grain the width of the opening of the sieve is the most critical. Therefore it is proposed that the particular variety of grain can be provided as input and/or detected by a sensor and that the operating parameters that can be displayed or provided as input are a function of the variety of grain detected. In order to make possible the simplest operation only the particularly critical operating parameters could be displayed or changed. Here the number of the operating parameters that can be changed and/or displayed in the operating mode depending on the variety of grain are not necessarily distinguished in the control assembly. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a semi-schematic side view of an agricultural combine. 
       FIG. 2  is a schematic view of an on-board computer system. 
       FIG. 3  is a view of the display assembly of the operating unit in the first operating mode. 
       FIG. 4  is a view of the display assembly of the operating unit in the second operating mode. 
       FIG. 5  is a flow diagram for operation of the control unit. 
   

   DETAILED DESCRIPTION 
     FIG. 1  shows the side view of a self-propelled agricultural combine  10 . Although the present invention is disclosed on the basis of an axial flow combine, it can also be applied to conventional and other combines as well as to any desired other type of work and agricultural machine. 
   The combine  10  contains a support structure  12  with wheels  14 . A harvesting assembly  16  extends forward from the combine  10  and conducts harvested crop to a feeder house  18 . The feeder house  18  contains a conveying assembly in order to conduct the harvested crop to the threshing, separating and cleaning assemblys of the combine  10 . The feeder house  18  conducts the harvested crop to an infeed beater  20  that extends in the transverse direction and that supplies the crop through an inlet transition section  22  to an axial threshing and separating assembly  24 . Grain and chaff are conducted by the axial threshing and separating assembly  24  to a cleaning assembly  26 . The cleaning assembly  26  in turn conducts the grain that has been cleaned to a grain tank  28  and the chaff is blown by the cleaning blower  30  out of the rear side of the combine. Large crop componenets that is neither grain nor chaff is conducted by the axial threshing and separating assembly  24  to a discharge beater  32  arranged in the transverse direction which conveys this material out of the rear side of the combine  10 . Crop that is stored temporarily in the grain tank  28  can be discharged by the actuation of a discharge auger  36  by the action of an operator in an operator&#39;s cab  34 . 
   In the cleaning assembly  26  an upper sieve  40  and a lower sieve  42  are arranged above each other. During the operation of the cleaning assembly  26  the sieves  40  and  42  themselves perform a vibration in such a way that the harvested crop separated by the threshing and cleaning assembly  24  is accepted and conveyed against the direction of operation of the combine  10 . The upper sieve  40  and the lower sieve  42  are equipped with adjustable plates extending in the transverse direction that are fastened to a rectangular frame, that is supported by the side walls of a cleaning shoe. In order to attain the optimum degree of cleaning in the cleaning assembly  26  the rotational speed of the cleaning blower  30  and the width of the opening of the sieves  40  and  42  can be varied. Therefore each of the sieves  40  and  42  is associated with a repositioning drive  74  or  76  for the repositioning of the width of the sieve opening. The electrically driven repositioning drives  74  and  76  are arranged for the repositioning of the pivot angle of the plates. In each case a sieve opening sensor, not shown, is arranged to detect the position of the plates of the lower sieve  42 . The upper sieve  40  is also associated with a sieve opening sensor, not shown. A control unit  100  arranged in the operator&#39;s cab  34  that is electrically connected with the sieve opening sensors and the repositioning drives  74  and  76  drives the repositioning drives  74  and  76  to adjust the width of the sieve openings. 
   The control unit  100  is located in the operator&#39;s cab  34  of the combine  10 . It controls the repositioning drives  74  and  76  and is connected with a further sensor in addition to the sieve opening sensors. Underneath the lower sieve  42  a grain sensor  72  is arranged that measures the amount of grain delivered downward through the lower sieve  42 . 
   An operating unit  102  is located in the operator&#39;s cab  34  and is shown in greater detail in FIG.  2 . The operating unit  102  includes a housing  110  in which a display unit  104  and an input unit in form of input keys  106  are provided. The input keys  106  are arranged to the left of the display unit  104 . In place of the input keys  106  or in addition thereto a voice input unit or any other desired input unit may also be provided. 
   The operating unit  102  is connected over a bus  108  to the repositioning drives  74  and  76 , the separating sensor  72  and the control unit  100 . The display unit  104  displays several operating parameters of the combine  10  to the operator. The input keys  106  permit a change and/or selection of operating parameters. The control unit  100  receives the immediate input data from the input keys  106  and drives the affected actuators or other elements of the combine  10  that can be controlled electronically to the desired value. For example, in the case of the width of the opening of the sieves  40  and  42  a control is performed by means of the sieve opening sensors which transmit the current sieve opening value to the control unit  100 . The control unit  100  then brings about a repositioning of the plates by means of the repositioning drives  74  or  76 . Furthermore the control unit  100  can adjust or control the forward propulsion velocity of the combine  10 , the rotational speed of the axial threshing and separating assembly  24 , the width of the slot in the threshing and/or separating region, the rotational speed of the main drive engine and other operating parameters. A partial or complete automation is possible, where the control unit  100  adjusts the operating parameters of the actuators of the combine  10  that can be controlled by it as a function of sensor signals (for example, of the grain sensor  72 ) so that only a few or no inputs at all are required from the input keys  106 . 
   The operating unit  102  contains electronic components that make possible a transmission of the data that is to be displayed by the display unit  104  and the data that have been provided as input by the input keys  106  over the bus  108  to the control unit  100 . The operating unit  102  may be equipped with its own microprocessor and/or micro-controller. It would also be conceivable to integrate the control unit  100  into the operating unit  102  or the inverse. The operating unit  102  may be removable in order to be able to apply it to other machines. 
   Thereby the combine  10  contains a relatively large number of elements whose adjustment can affect the result of the operation of the combine  10 . It is possible only for a relatively experienced operator to have all elements of the combine  10  that can be influenced to conform in each case to the immediate optimum operating parameters. For a less experienced operator it makes more sense if the operating parameters are provided as input and as few inputs as possible are required, since then the possibility of errors is reduced. 
   According to the invention the operating assembly  102  makes available various operating modes. In a first operating mode, that is particularly appropriate for experienced operators, the operating parameters of all adjustable elements can be displayed and changed. They need not all be displayed simultaneously on the display unit  104 , but may be recalled by means of menus or sub-menus, in which useful operating parameters may be grouped. The operator may change these parameters corresponding to his experience and ideas by means of the input keys  106 .  FIG. 3  shows an example of the display unit  104  in the first operating mode. The left half of the display unit  104  shows parameters that can be changed and their present selected values, particularly the size of the threshing slot  300 , rotational speed of the rotor  302  of the threshing and separating assembly  24 , the width of the opening of the upper sieve  40  and the lower sieve  42 ,  304  and  306 , and the variety of grain  308 . The right half of the display unit  104  shows parameters that are permanently provided as input (for example, the rotational speed of the engine  310 ) that can be changed by means other than the input keys  106  (for example, the forward propulsion velocity  312  that can be controlled by a drive lever) or that are only indirectly controlled or that represent the result of the operation (for example, the contents of the grain tank  314 ). 
   In case that an operator with only limited experience operates the combine, the operating unit  102  is operated in a second operating mode. In this operating mode only a few inputs are possible. An example is shown in  FIG. 4 , in which only the variety of grain  308  is displayed on the left half of the display unit  104 . The right half of the display unit  104  also displays fewer data than in the first operating mode; the rotational speed of the engine is not shown. In the second operating mode only the parameters reproduced in the left half of the display unit  104  can be changed, that is, in the example shown, only the variety of grain  308 . The control unit  100  adjusts the elements of the combine  10  that can be controlled by it to operating parameters that can be calculated on the basis of the variety of grain  308  provided as input or are recalled from a table. At that time measured values from sensors, for example, from the separating sensor  72 , can be considered. The second operating mode permits the operator to change only the variety of grain, on which the control unit  100  has based the operating parameters, but no further parameters. Thereby there is only a slight danger that the result of the operation is impaired by input errors. 
   On its left half the display unit  104  displays the operating parameters that can be changed with the input keys  106 . The current meaning of the input keys  106  is thereby reproduced (in pictures or characters) in signs on the adjoining region of the display unit  104 . In the example according to  FIG. 4  the variety of grain  308  can be provided as input by means of the upper input key  106 . Further keys may also be provided with which, for example, a cursor can be controlled or menus and sub-menus can be recalled. 
     FIG. 5  shows a flow diagram according to which the control unit  100  proceeds upon starting of the main drive engine of the combine  10 . After the start in step  200  the operator is given the choice in step  202  of giving as input his name and a password by means of the input keys  106 . The names and passwords of the persons authorized to operate the combine  10  are stored in memory in the control unit  100 , which can be performed by a supervisor who has a corresponding authorization. In the control unit  100  information is also stored in memory as to which operator is associated with which operating mode. 
   In the following step  204  the question is posed whether a false password has been entered. If this is the case, step  202  again follows. Otherwise step  206  follows in which the question is posed with which operating mode the operator is associated. If this operator is associated with the first operating mode, step  210  follows, in which the operating unit  102  operates in the first operating mode. Otherwise step  208  follows in which the operating unit  102  operates in the second operating mode. 
   Having described the illustrated embodiment, it will become apparent that various modifications can be made without departing from the scope of the invention as defined in the accompanying claims.