Patent Publication Number: US-2021185926-A1

Title: Mower combination

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims the benefit of U.K. Application No. GB1918841.6, filed Dec. 19, 2019, which is hereby incorporated by reference in its entirety. 
     BACKGROUND 
     Field 
     The present invention relates to a mower combination comprising an agricultural vehicle and a number of mowing units suitable for generating swathes of cut crop, and in particular to a mowing apparatus for cutting a standing crop such as hay. 
     Description of Related Art 
     It is known to provide a mower combination in which a first mower unit is located ahead of an agricultural vehicle such as a tractor with two further lateral mowing units trailing the agricultural vehicle. The rear mowing units are provided with conveyor units for depositing cut crop into a swath or swathes behind the agricultural vehicle. 
     It is known for an operator to adjust the conveyors units to change the configuration of the swaths produced, for example to change from a single broad triple width swath to a double width swath accompanied by a single width swath or to a set of three single width swaths (and to have different spacings of such single width swaths depending upon the operation of the conveyor units). In the case of a first journey producing a double width swath accompanied by a single width swath, it will be understood that a second return journey will produce a set of three double width swaths. 
     For example depending upon the subsequent treatment of the cut crop different widths of swath may be appropriate. It may be that a loader wagon will collect cut crop from a broader swath, but that a baler requires a narrower swath. Thus an operator will wish to control the swath pattern produced for each set of cut crop to be processed. 
     However, the need to constantly monitor and adjust the settings of the conveyor units to produce multiple swaths of the desired configurations throughout the working of multiple fields of varying shapes and sizes is stressful and tiring for the operator of the mower combination. 
     SUMMARY 
     According to a first aspect of the present invention, a mower combination comprises an agricultural vehicle and a number of mowing units suitable for cutting a standing crop connected to the agricultural vehicle, including a front mowing unit and two lateral mowing units located behind and to the sides of the front mowing unit, each of the lateral mowing units being provided with conveyor units to deposit the cut crop as a swath, the mower combination further comprising a user terminal coupled to a control unit, the control unit receiving a plurality of signals, the signals representing the location of the mower combination and a direction of operation of each of the conveyor units, characterised in that the control unit is configured to receive the plurality of signals and compare the signals representing the location of the mower combination and the direction of operation of the conveyor units against a predetermined set of values and as required to adjust the direction of operation of at least one conveyor unit based on this comparison. 
     This has as an advantage that the operator no longer needs constantly to monitor the operation of the conveyor units thereby reducing the stress and tiredness of the operator. 
     Preferably, the predetermined set of values includes a desired track line and a desired direction of operation of each conveyor unit. 
     Preferably, the conveyor units comprise conveyor belts or conveyor screws. 
     Preferably, the user terminal being used to provide the desired predetermined values for the direction of operation of the conveyor units in relation to the location of the mower combination. 
     Preferably, the user terminal provides feedback to an operator of the adjustment of the direction of operation of the at least one of the conveyor units. 
     According to second aspect of the invention, a method of operation of a mower combination in accordance with the first aspect of the invention comprises providing a predetermined set of values to the control unit, monitoring the location of the mower combination and the direction of operation of the conveyor units and providing signals representative of the location of the mower combination and the direction of operation of the conveyor units to the control unit, the control unit comparing the signals representing the location of the mower combination and the direction of operation of the conveyor units against the predetermined set of values and as required signalling at least one conveyor unit to adjust the direction of operation of the at least one conveyor unit based on this comparison. 
     Preferably, the step of providing the predetermined set of values to the control unit is performed by an operator entering the predetermined set of values into the user terminal. 
     Alternatively, the step of providing the predetermined set of values to the control unit is performed by an operator entering the predetermined set of values into a remote computing device in communication with the control unit. 
     Alternatively, the step of providing the predetermined set of values to the control unit is performed by an operator entering a first set of the predetermined set of values into a remote computing device in communication with the control unit and a second set of the predetermined set of values into the user terminal. 
     According to a third aspect of the invention, a computer implemented method comprises the steps of receiving a plurality of signals, the signals representing the location of the mower combination and a direction of operation of each of the conveyor units, the control unit being configured to receive the plurality of signals and compare the signals for the location of the mower combination and the direction of operation of each conveyor unit against a predetermined set of values and as required to adjust the direction of operation of at least one conveyor unit based on this comparison. 
     According to a fourth aspect of the present invention, a computer readable program comprises instructions that causes one or more processors to implement the method of the second aspect of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will now be described, by way of example only, with reference to the accompanying drawings, in which: 
         FIG. 1  shows a plan view of a mower combination for use in the present invention; 
         FIG. 2  shows a schematic view of elements of a mower combination for use in the present invention; 
         FIG. 3  shows a flow diagram illustrating an example control method for swath formation in accordance with the present invention; 
         FIG. 4  shows schematically an example generated swath pattern; and 
         FIG. 5  shows the generated swath pattern being worked by a subsequent implement. 
     
    
    
     DETAILED DESCRIPTION OF SPECIFIC EMBODIMENTS 
     The invention will now be described in the following detailed description with reference to the drawings, wherein preferred embodiments are described in detail to enable practice of the invention. Although the invention is described with reference to these specific preferred embodiments, it will be understood that the invention is not limited to these preferred embodiments. But to the contrary, the invention includes numerous alternatives, modifications and equivalents as will become apparent from consideration of the following detailed description. 
     Reference to terms such as longitudinal, transverse and vertical are made with respect to a longitudinal vehicle axis which is parallel to a normal forward direction of travel. 
     With reference first to  FIG. 1 , a plan view of a mower combination  2  for use in the present invention is shown. 
     A mower combination  2  comprises an agricultural vehicle  4  such as a tractor and a number of mowing units  6 , 8 , 10  suitable for cutting a standing crop, such as grass, the mowing units  6 , 8 , 10  being connected to the agricultural vehicle. The mowing units include a front mowing unit  6  located to the front of the agricultural vehicle  4  and two lateral mowing units  8 , 10  located behind and to the sides of the agricultural vehicle  4 , each of the mowing units  6 , 8 , 10  being adapted to cut the standing crop. The front mowing unit  6  is conveniently mounted on a front hitch  12  of the agricultural vehicle  4 . The two lateral mowing units  8 , 10  are conveniently mounted on a central chassis supported from a rear hitch  14  of the agricultural vehicle  4 . 
     The lateral mowing units  8 , 10  are supported from a central chassis by hydraulic apparatus  22 , 24 . Each hydraulic unit  22 , 24  may be used to move a respective lateral mowing unit  8 , 10  from a working position to a transport position. A headland position may be defined between the working position and the transport position. In the working position the height of each of the lateral mowing units  8 , 10  above the ground surface may be further controlled by operation of the hydraulic apparatus  22 , 24 . Additional hydraulic units (not shown) may be used to control the lateral displacement of the working position of each lateral mowing unit  8 , 10 . 
     In the illustrated embodiment of  FIG. 1  a swath  20  produced by the front mowing unit  6  is shown. In practice, conveyor units  16 , 18  mounted to the rear of the lateral mowing units  8 , 10  are adapted to direct the deposit of cut crop material from each of the lateral mowing units  8 , 10  to one side or the other of the respective lateral mowing units  8 , 10 . For clarity, the swathes produced by the lateral mowing units  8 , 10  are omitted from  FIG. 1 . 
     The conveyor units  16 , 18  are mounted to be displaceable with respect to the lateral mowing units  8 , 10 . The conveyor units may be displaced by hydraulic apparatus  26 , 28  or other suitable apparatus. 
     The conveyor units  16 , 18  can comprise conveyor belts or conveyor screws. 
     An operator can control operation of the front and rear mowing units  6 , 8 , 10  from within the agricultural vehicle  4  by use of a suitable user terminal  30  ( FIG. 2 ). For example the operator can control operation of the direction of the conveyor units  16 , 18 , can cause each of the mowing units  6 , 8 , 10  to move from a working position to a headland position, and can cause the rear mowing units  8 , 10  to move from the working position to a transport position. It is an advantage of the present invention that while an operator can control operation of the conveyor units using the user terminal the present invention eliminates or at least substantially reduces the need to do so. 
     The user terminal  30  communicates with an electronic control unit  32 . In repose to operator instructions entered into the user terminal, the control unit  32  may provide signals to control operation of the front and rear hitches  12 , 14  of the agricultural vehicle  4  and provide signals to control operation of the mowing units  6 , 8 , 10  and the conveyor units  16 , 18 . Conveniently the signals are provided by way of a suitable data communication network  40  such as one compliant with the ISOBUS standard (a network in conformance to ISO 11783). 
     The control unit  32  may conveniently comprise a single processor located on the agricultural vehicle or its functions may be split between a processor located on the agricultural vehicle and one or more additional processors located on the mowing units  6 , 8 , 10 , the additional processor(s) being in electronic communication with the first processor. 
     The control unit  32  is also able to access a suitable memory  34 . The memory  34  may take any suitable form and is in electronic communication with the control unit  32 . The memory  34  is adapted to store, in any suitable manner such as a database or look up table, reference values for a desired direction of operation of the conveyor units  16 , 18  with reference to a predetermined track line. The track line and the desired direction of operation of the conveyor units during movement of the mower combination along the track line can be determined by an operator for example by entering the desired track line and swath pattern to be obtained using the user terminal  30 . 
     The mower combination  2  further comprises a plurality of sensors adapted to provide input signals to be received by the control unit  32 . 
     A position signal  42  representing the location of the mower combination  2  can be provided as a result of information provided by a GPS sensor, or may be known or calculated from existing mapped data together with inputs representing the speed and direction of the of the agricultural vehicle allowing the control unit  32  to determine the position of the mower combination. 
     In the case of a GPS sensor, it will be understood that a network interface  44  connected to the control unit  32  is provided. The network interface  44  can comprise hardware and/or software that enables wireless connection to one or more remotely located computing devices over a network (e.g., a wireless or mixed wireless and wired network). For instance, the network interface  44  may cooperate with browser software or other software of the control unit  30  to communicate with a server device, enabling remote monitoring or control of the mower combination  2 . 
     The operator may also configure details of the track line and desired swath pattern by way of a remote computing device, such that these details may then downloaded by way of the network interface  44  or otherwise provided to the control unit  32  for storage in the memory  34  before commencing operation of the mower combination. 
     Alternatively a first set of the predetermined set of values, for example the desired track lines, may be provided by way of a remote computing device, where the operator uses suitable using mapping software to produce the desired track lines and a second set of the predetermined set of values, for example the desired swath patterns for production on a particular day, may be entered into the user terminal. 
     Suitable lateral displacement sensors  46  mounted on the mower combination  2 , for example on the mowing units  8 , 10  can provide input signals representative of the lateral displacement of the mowing units  8 , 10 . The displacement may be measured from any suitable reference point. 
     Suitable directional sensors  48  mounted on the mower combination  2 , for example on the conveyor units  16 , 18 , can provide input signals representative of the direction of operation of each conveyor unit  16 , 18 . 
     In use, an operator first configures the desired track lines defining the path of the mower combination and swath to be produced (step  100 ,  FIG. 3 ). The mower combination is then directed along the desired track lines (for example, either driven by a driver following instruction or guidance from the user terminal or directed by an autonomous control system) (step  102 ). During operation of the mower combination a comparison of the input signals received by the control unit  32  with the predetermined set of values stored in the memory  34  takes place (step  104 ). The control unit  32 , as appropriate, then causes a change of direction of at least one conveyor unit  16 , 18  (step  106 ) such that the desired swath pattern is produced. 
     In  FIG. 4 , the path of a single mower combination  2  is shown traversing a field. Firstly the mower combination follows the path indicated by the first set of arrows A (leaving uncut sections of crop between the track lines), and once the width of the field has been traversed, the path indicated by the second set of arrows B is followed (where the uncut sections of crop may be cut). This allows for a relatively shallow turn, minimising manoeuvring in the headlands. It will be noted that in the headland turn the direction of operation of each of the conveyor units  16 , 18  is reversed. 
     It will be understood that each lateral mower unit can produce two principal swaths: a swath may be generated either to the left or right of the mower unit depending upon the direction of operation of the conveyor unit. Adjustments to these swath positions relative to the central swath produced by the front mower can be made by adjusting the lateral position of each lateral mower unit. 
     In  FIG. 5  a subsequent implement  60  is shown working the generated swath pattern. 
     In some embodiments, the control unit  32  may provide feedback of the automatic adjustment of the conveyor units  16 , 18  to the operator via the user terminal  30 , for example visually or audibly. 
     From reading the present disclosure, other modifications will be apparent to persons skilled in the art. Such modifications may involve other features which are already known in the field of mowers and component parts therefore and which may be used instead of or in addition to features already described herein.