Abstract:
In accordance with an example embodiment, an arrangement for controlling a lighting device of a working vehicle where the lighting device is directed toward an adjustable operating element of the working vehicle. A control device is connected to the lighting device. The control device is operated to switch the lighting device on according to a detected adjustment of the operating element.

Description:
RELATED APPLICATION 
       [0001]    This claims priority to German patent application number 102015216883.2, filed Sep. 3, 2015. 
       TECHNICAL FIELD 
       [0002]    The present disclosure generally relates to an arrangement for controlling a lighting device of a working vehicle. 
       BACKGROUND 
       [0003]    In agriculture, working vehicles, in particular, tractors, are utilized for different tasks, for example, for tillage, for applying material such as seeds or fertilizer, on a field, for harvesting work, or for hauling work. Thus, different implements must be coupled to the working vehicle, such as plows, sowing machines, fertilizer spreaders, balers, mowing implements, attached forage harvesters or hauling trailers. The working vehicles are therefore equipped with one or more interfaces, at which different implements can be attached. Such interfaces can include a trailer hitch for attaching, e.g., a hauling trailer or a baler, a rear three-point hitch on the rear side of the working vehicle and/or a three-point hitch on the front side of the working vehicle, each of which is used for attaching implements that are not coupled via a tow bar, e.g., mowing implements, forage harvesters, fertilizer spreaders, sowing machines, or plows. 
         [0004]    When attaching the implements, initially the working vehicle must be driven into a suitable position with respect to the implement. Subsequently, the couplings must be adjusted in such a way that connecting elements between the working vehicle and the implement can be closed. Finally, the connecting elements are then closed, in order to establish a temporary coupling of the implement to the working vehicle. In the prior art, these steps are carried out at an operator workstation of the working vehicle. Thus, the operator initially drives the working vehicle to a suitable point in the vicinity of the implement and then adjusts the coupling with respect to the working vehicle by actuating input elements disposed at the operator workstation for controlling external force-actuated actuators for adjusting the coupling. Finally, the implement is then locked at the coupling, which takes place either via remote control from the operator workstation or directly at the spot via manual action by the operator. In this case, it is not easy for the operator to achieve the correct position of the coupling with respect to the implement from his operator workstation, in particular in darkness or at twilight. Therefore, the operator often must climb down from his operator workstation in order to look at the interface and then, after returning to the operator workstation, carry out corresponding inputs for controlling the actuator. In the end, coupling the implements is highly time-consuming in many cases. 
         [0005]    Arrangements have already been proposed, in which additional input elements for influencing the position of couplings and for selecting a gear ratio, including a neutral position of a power take-off drive, are installed on a rear fender of the working vehicle (e.g., DE 10 2005 003 325 A1), which input elements can be actuated by an operator standing behind or at the side of the working vehicle. In addition, wired or wireless remote controls for agricultural working nvehicles were proposed, with which the operator can control, inter alia, a hydraulic lifting unit and a power take-off shaft from outside the operator workstation (EP 1 004 230 A2, DE 102 17 398 A1, DE 10 2014 211 712 A1). As a result of these operating options, the visibility of the interface is improved but is not always sufficient for effectuating a problem-free coupling of the implement at twilight or in darkness. The lighting of the working vehicle that is usually present (DE 10 2007 013 810 A1, EP 2 402 213 A2) is designed to illuminate the surroundings of the working vehicle and, optionally, of the implement during road travel or field work and does not illuminate the interface particularly well. 
         [0006]    In addition to the aforementioned implement interfaces of the working vehicles, it is also necessary, in the case of harvesting machines, for example, to adjust operating elements of the actual working vehicle, for example, the threshing concave gap or the size of the sieve opening in the case of a combine harvester. If these adjustments are not intended to be carried out from the operator workstation, but rather at the spot (either purely manually or by means of an external force-actuated actuator), the operator needs a flashlight, at twilight or in darkness, in order to see the adjustment, or a fixedly installed lighting device (cf. DE 10 2007 007 385 A1 for the lighting of a returns conveyor) is installed, which is switched on by means of a switch, which first must be located. 
         [0007]    Lighting devices for working vehicles have also been described, which are controlled by means of a light sensor control and a motion detector, in order to make it easier for the operator to arrive at and leave the workstation in darkness by illuminating the access path (DE 10 2010 052 825 A1, EP 2 548 430 A1). The aforementioned problem is not solved as a result. 
       SUMMARY 
       [0008]    The problem addressed by the invention is considered to be that of making it easier for the operator of a working vehicle to visually monitor an adjustable operating element of the working vehicle, in particular, in darkness or at twilight, which element is not sufficiently illuminated in the prior art. 
         [0009]    The present invention is defined by the claims. 
         [0010]    An arrangement for controlling a lighting device of a working vehicle comprises a lighting device, which is directed toward an adjustable operating element of the working vehicle, and a control device, which is connected to the lighting device and can be operated to switch the lighting device on according to a detected adjustment of the operating element. 
         [0011]    In other words, the control device automatically detects when an adjustment of the operating element is carried out and, precisely when an adjustment takes place, switches on the lighting device directed toward the operating element. In this manner, an illumination of the adjusted operating element takes place automatically, which makes it substantially easier for the operator to visually monitor the procedure for adjusting the operating element. Work safety is also improved. 
         [0012]    The control device can also be connected to a device for detecting the intensity of the ambient light and can be operated to activate the lighting device on the basis of signals from the device for detecting the intensity of the ambient light only at twilight or in darkness. 
         [0013]    In one possible embodiment, the control device can be supplied with a piece of information, which is ascertained by sensors, regarding the position of the operating element, which is actuated manually or by means of external force. The particular position of the operating element is therefore ascertained by a sensor connected to the control device. As soon as the operating element is adjusted, the signal from the sensor changes and the control device activates the lighting device. In the case of an external force-actuated operating element, the sensor can deliver a feedback value to a closed-loop control for monitoring the position of the operating element. This closed-loop control can take place by means of the control or a regulating device separate therefrom. 
         [0014]    In another embodiment, the control device can be supplied with a piece of information regarding a control signal for controlling an external force-actuated actuator for adjusting the operating element. These embodiments can be combined with the aforementioned embodiment, e.g., when the operating element is both actuated by means of external force and is manually adjustable. 
         [0015]    The control device can be connected to an operator input device and the actuator, and can be operated to control the actuator on the basis of signals from the operator input device. The operator input device can be fixedly installed at the operator workstation of the working vehicle or can be fixedly installed on the working vehicle, adjacent to the operating element, or can be a hand-held device. 
         [0016]    The operating element can be an interface on the working vehicle for attaching an implement. In another embodiment, however, the operating element can also be a crop-processing element of a harvesting machine, or any other type of adjustable element of the working machine, including an implement coupled thereto, such as a row marker of a sowing machine. In this case, the working vehicle having the implement is considered to be the working vehicle in the sense of the claims. 
         [0017]    The control device is preferably designed to allow the lighting device to remain switched on for a specified length of time after the detected end of the adjustment of the operating element. 
         [0018]    The present invention can be utilized on working vehicles of any type, such as agricultural working vehicles in the form of, e.g., tractors or harvesting machines, or construction machines. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0019]    The detailed description of the drawings refers to the accompanying FIGURE in which: 
           [0020]    At least one example embodiment of the subject matter of this disclosure is understood by referring to  FIG. 1  of the drawings. 
           [0021]      FIG. 1  illustrates a side view of a tractor. 
       
    
    
     DETAILED DESCRIPTION 
       [0022]    An agricultural working vehicle  10  in the form of a tractor is represented in  FIG. 1 , which is built on a frame  12  and is supported on the ground by means of front, steerable wheels  14  and drivable, rear wheels  16 . The operator workstation is located in a cab  18 . 
         [0023]    A rear three-point hitch  20  is disposed at the rear end of the frame  12 , which hitch is formed from two lower control arms  22 , which are disposed next to one another, and one upper control arm  24 . The lower control arms  22  are height-adjustable by means of actuators  26  in the form of hydraulic cylinders. The upper control arm  24  is length-adjustable by means of an actuator  28  in the form of a hydraulic cylinder. By adjusting the actuators  26 , the rear ends of the lower control arms  22  can be brought into a position in which they can be coupled to any type of implement (not shown). Coupling points  30  in the form of link hooks (or any other type of coupling points, e.g., coupling eyes, of the type described in DIN ISO 730-1 Agricultural machines and tractors—Rear-mounted three-point linkage—Part 1: Categories 1, 2, 3 and 4), are disposed at the rear end of the lower control arms  22  in a manner known per se, whereas an upper control arm coupling point  32 , which is also conventional, is provided at the rear end of the upper control arm  24 . 
         [0024]    In addition, a power take-off shaft  34  for driving moving elements of the implement is installed on the rear side of the frame  12 . 
         [0025]    A front three-point hitch  36  is disposed at the front end of the frame  12 , which hitch comprises two lower control arms  40 , each of which is height-adjustable by means of an actuator  42 . The front three-point hitch  36  also comprises an upper control arm  38 , which is represented here as non-height-adjustable. The control arms  38 ,  40  are connected to any type of implement  44 . 
         [0026]    A control device  46  is electrically connected to a valve unit  48 , which, in turn, hydraulically controls, inter alia, the actuators  26 ,  28 ,  42 . The control device  46  is also connected to a transmitter/receiver module  52 , which has an antenna  50 . 
         [0027]    A portable hand-held device  54  comprises a processor  56 , a transmitter/receiver module  58 , a preferably touch-sensitive display device  60 , and a keypad  62 . The processor  56  communicates with the control device  46  via the transmitter/receiver module  58  and the transmitter/receiver module  52  in order to transmit commands to the working vehicle  10  for the actuators  26 ,  28 ,  42 , which commands are input via the keypad  62 , which is used as an input means, and/or the touch-sensitive display device  60 . The transmitter/receiver modules  52 ,  58  can communicate with one another via any standard (e.g., for cellular phones, such as GSM or UMTS; or computer networks, e.g., WLAN or Bluetooth). 
         [0028]    The hand-held device  54  can be designed as a commercially available tablet computer or as a smartphone. Software runs on said device in order to carry out the described function, which software was downloaded as an app from an Internet address, after an authentication, in a manner known per se. If the hand-held device  54  is not needed as a remote control, it can be inserted into a holder  64  in the cab  18 , which functions as a docking station and in which the rechargeable batteries of the hand-held device  54  are charged. In the holder  64 , the hand-held device  54  can be used as an input device for controlling any functions of the working vehicle  10  and, in particular, can emulate a virtual terminal according to ISO 11783. 
         [0029]    The hand-held device  54  can be used as a remote control in order to simplify the coupling of an implement  44  at one of the implement interfaces of the working vehicle  10 . For this purpose, the working vehicle  10  is initially driven into the vicinity of the implement  44 , until it is located sufficiently close to the implement  44  in order to couple it. The operator, who has the hand-held device  54 , then leaves his operator workstation in the cab  18  and moves into the vicinity of the particular interface in question. The operator then actuates the input means of the hand-held device  54  in order to bring the control arms  22 ,  24 ,  38 ,  40  into a suitable position and, finally, locks the implement  44  on the control arms  22 ,  24  or  38 ,  40 , either manually or by means of further actuators (not shown), which are controlled by means of the hand-held device  54  in the manner described. In an analogous manner, the power take-off shaft  34  can also be switched on and off by means of the hand-held device  54 , or a power-take off drive can be brought into a neutral position. In addition, a fixed or adjustable coupling  72  for a tow bar can also be opened and closed via the computer  54  and, optionally, can be adjusted in terms of its position. 
         [0030]    The adjustment of the actuators  26 ,  28 ,  42  can also take place via a user interface  76 , which is fixedly installed in the cab  18  and is connected to the control unit  46 , or by means of a push-button  78  on the rear fender, which push-button is connected to the control unit  46 . 
         [0031]    In order to make it easier for the operator to couple the implement to the rear three-point hitch  20 , a lighting device  80  is installed above, on the cab  18 , which lighting device is operated by the on-board power supply of the working vehicle  10  and is controlled by the control device  46 . When the lighting device is switched on, a light cone  82  emitted by the lighting device  80  illuminates the three-point hitch  20  and, in particular, its coupling points  30 ,  32 . When a device  84 , connected to the control device  46  for detecting the intensity of the ambient light signals to the control device  46  that the available daylight or ambient light is not sufficiently bright (e.g., as bright as the light from the lighting device  80  at the coupling points  30 ,  32 ), and one of the actuators  26 ,  28  is adjusted, the control device  46  activates the lighting device  80 . This control can be based on the control commands issued to the control device  46 . These commands are issued by the hand-held device  54  or by the user interface  76  or by the push-button  78  to the control device  46 , or said control can be based on signals from actuator position sensors  86 ,  88 , which ascertain the position of the actuators  26 ,  28  and signalize said position to the control device  46  for closed-loop control and/or display purposes. After the final adjustment, the control device  46  leaves the lighting device  80  on for a certain length of time and then switches it off 
         [0032]    It would also be possible to direct an analogous lighting device (not shown) onto the front three-point hitch  36  and activate it during an adjustment of the front three-point hitch, or to adjust the lighting device  80  shown via the control device  46  by means of a suitable drive and, if necessary, direct it toward the front three-point hitch.