Patent Application
20090287380
The present invention relates to a work machine, and more particularly, to a system and method for broadcast spreading of a material, such as chaff, in wind conditions.
Work machines, such as combines, are employed in the agricultural industry for harvesting crops. Typical such work machines move through a crop field during harvesting operations while operating a header at the front of the work machine to cut the crop. Once cut, the grain is removed from the crop materials by threshing and separating assemblies on the work machine, and then transferred to the work machine's hopper for temporary storage. Such work machines may also employ a spreader that receives the chaff exiting the threshing and separating assemblies, and discharges the chaff from the work machine. For example, with some crops, e.g., corn, a spreader may be employed, whereas with other crops, e.g., wheat, a spreader may not be employed.
During harvesting operations, it is desirable to discharge the chaff uniformly across the field by distributing the chaff along the width of the swath cut by the work machine's header. Thus, as each swath of crop is cut, the grain is removed and stored in the hopper, and the chaff is processed and then distributed back onto the swath from which the crop was cut, behind the combine. By distributing the chaff in this manner, the chaff is evenly distributed throughout the field. Also, it is desirable to avoid spreading the chaff onto portions of the crop that have not been harvested yet, e.g., the next swath to be harvested that is adjacent to the current swath being harvested. For example, spreading chaff onto portions of the crop that have not yet been harvested may interfere with and reduce the efficiency of the header, threshing and separating assemblies, potentially resulting in a reduced yield of grain. However, the presence of wind may disrupt the flow of chaff exiting the spreader, causing the chaff to be discharged onto parts of the field that have not been harvested yet and/or leaving portions of the field that were harvested devoid of chaff.
Accordingly, there is a need in the art for a work machine, system and method for broadcast spreading of material, such as chaff, in wind conditions.
The present invention provides a work machine, system and method for broadcast spreading of material, such as chaff, in wind conditions.
The invention, in one form thereof, is directed to a work machine. The work machine includes a spreader configured for broadcast spreading of a material from the work machine; an input device configured to provide wind condition data; an orientation control device configured to determine an orientation of the work machine; and a controller coupled to the spreader, the input device and orientation control device. The controller is configured to execute program instructions to control the broadcast of the material from the work machine based on the wind condition data from the input device and based on the orientation of the work machine.
The invention, in another form thereof, is directed to a system for broadcast spreading of a material from a work machine in wind conditions. The system includes a spreader configured for broadcast spreading of the material; an input device configured to provide wind condition data; an orientation control device configured to determine an orientation of the work machine; and a controller coupled to the spreader, the input device and the orientation control device. The controller is configured to execute program instructions to control the broadcast of the material from the work machine based on the wind condition data from the input device and based on the orientation of the work machine.
The invention, in yet form thereof, is directed to a method for broadcast spreading of a material from a work machine in wind conditions. The work machine includes a spreader. The method includes establishing a first lateral broadcast boundary and a second lateral broadcast boundary; receiving wind condition data; determining an orientation of the work machine using an orientation control device; and controlling the spreader based on the wind condition data and the orientation to maintain the first lateral broadcast boundary and the second lateral broadcast boundary.
Referring now to
Work machine 10 may include a header 12, a hopper 14, and a system 16 configured for broadcast spreading of material from work machine 10, such as chaff, e.g., material other than grain (MOG) extracted during crop harvesting operations. Work machine 10 also includes an orientation control device 18 configured to determine the orientation of work machine 10. Orientation control device 18 is configured to determine the yaw orientation, i.e., the compass direction that describes the direction in which work machine 10 is facing, e.g., when moving about during harvesting operations.
For example, orientation control device 18 may be in the form of a vehicle tracking system. In the present embodiment, orientation control device 18 is in the form of a global positioning system (GPS) receiver 18 that is used by the operator of work machine 10 to enhance the efficiency of farming operations. GPS receiver 18 may also be configured to determine the speed of work machine 10, e.g., during harvesting operations, as well as the orientation of work machine 10 in the pitch and roll directions. However, it will be understood that other orientation control devices may be employed without departing from the scope of the present invention, e.g., satellite imagery-based devices, and/or gyro and/or accelerometer-based devices, and/or other wireless systems capable of providing work machine 10 orientation information. In any event, in the present embodiment, work machine 10 is configured to harvest a crop, and to uniformly distribute the chaff across the field being harvested using the orientation information obtained from GPS receiver 18.
Referring now to
Controller 22 is communicatively coupled to GPS receiver 18 via a communications link 30, communicatively coupled to input device 24 via a communications link 32, and communicatively coupled to spreader 20, in particular, impeller 26 and impeller 28, via respective communications links 34 and 36. In the present embodiment, communications links 30, 32, 34 and 36 are digital wired connections, such as control area network (CAN) links, although in other embodiments, communications links 30, 32, 34 and 36 may be any convenient link capable of transmitting control signals, such as analog and/or digital wired and/or wireless links.
Controller 22 includes a processor P and a memory M storing, among other things, program instructions executable by processor P for controlling the broadcast of chaff from work machine 10.
Impellers 26 and 28 may be independently controlled counter-rotating variable speed impellers, which may be controlled by controller 22, during broadcast spreading operations, based on inputs received at controller 22 from GPS receiver 18 and input device 24. Each of impellers 26 and 28 include eight downwardly extending impeller blades 38, although other numbers and orientations of blades may be employed without departing from the scope of the present invention. Each of impellers 26 and 28 may be driven by a hydraulic motor (not shown) to rotate about an axis that is substantially vertical, but which may be tilted somewhat in order to enhance broadcast performance. In other embodiments, electric motors and/or other motive devices and/or transmissions may be used to operate impellers 26 and 28. In the present embodiment, impeller 26 rotates in counterclockwise direction 40, when viewed from above, and impeller 28 rotates in clockwise direction 42. In any case, impellers 26 and 28 are configured to receive chaff 106 from work machine 10 and to distribute the chaff 106 behind work machine 10 as it traverses field 100 during harvesting operations.
Input device 24 is configured to provide input to controller 22, including wind condition data, such as wind speed and wind direction. In the present embodiment, input device 24 is in the form of a keyboard configured to receive wind condition data as input by the operator of work machine 10, and to provide the wind condition data to controller 22.
Referring now to
In the present embodiment, spreader 20 is located on the aft end of work machine 10. However, it will be understood that other spreader locations may be employed without departing from the scope of the present invention. In any event, spreader 20 broadcasts chaff 106 via impellers 26 and 28 behind work machine 10 into the current swath being cut in crop 102 by header 12, to thereby uniformly distribute chaff 106 across field 100.
System 16 is set up such that, during harvesting operations in windless conditions, impellers 26 and 28 will broadcast chaff 106 to lateral broadcast boundaries 44 and 46, respectively, that preferably correspond to the width W of the swath cut in crop 102 by header 12. Impeller speeds are increased in order to extend the lateral broadcast boundaries further away from work machine 10, and are decreased in order to retract the lateral broadcast boundaries toward work machine 10. The speed of impellers 26 and 28 may be initially set by the operator of work machine 10 based on crop conditions, e.g., crop type, moisture content, etc., so as to establish lateral broadcast boundaries 44 and 46 at the desired location. However, the presence of wind having a crosswind component (a wind velocity component in a direction perpendicular to the direction in which work machine 10 is facing/moving) will shift the lateral broadcast boundaries 44 and 46 in the direction of the crosswind component, causing chaff 106 to be broadcast into undesirable locations, such as into the crop 102 in the next swath to be harvested or on top of the chaff from the previously harvested swath, and may leave portions of the current swath barren of chaff 106.
For example, a crosswind component in direction 48 would shift lateral broadcast boundary 44 in direction 48 toward work machine 10, leaving a strip at the edge of the swath barren of chaff 106, while at the same time shifting lateral broadcast boundary 46 away from work machine 10 in direction 48, causing an overlap of chaff 106 with the previously harvested swath.
On the other hand, a crosswind component in direction 50 would shift lateral broadcast boundary 44 in direction 50 away from work machine 10 and into crop 102 of the next swath to be harvested, thus increasing the load on work machine 10 and reducing the efficiency of the harvesting operations in that swath, while at the same time shifting lateral broadcast boundary 46 toward work machine 10 in direction 48, leaving a strip at the edge of the current swath barren of chaff 106.
Accordingly, in an aspect of the present invention, controller 22 is configured to execute program instructions to control the broadcast of chaff 106 from work machine 10 based on wind condition data, e.g., received via input device 24, and based on the orientation of work machine 10 as determined by GPS receiver 18. The wind condition data may include wind speed data and wind direction data, e.g., obtained by the operator of work machine via weather forecast information or other sources of wind condition data, who enters the data into input device 24 for use by controller 22. In the present embodiment, the wind condition data is stored in memory M of controller 22 after being entered by the operator.
In particular, controller 22 is configured to execute the program instructions to determine a crosswind component based on the wind condition data and based on the orientation of work machine 10 as determined by GPS receiver 18, and to control lateral broadcast boundary 44 and lateral broadcast boundary 46 based on the crosswind component, including independently controlling the rotational speed of impeller 26 and the rotational speed of impeller 28 in order to maintain lateral broadcast boundary 44 and lateral broadcast boundary 46, based on the crosswind component. The crosswind component may be readily determined by controller 22 based on wind speed and wind direction in conjunction with the orientation of work machine 10, for example, by performing a vector analysis using algebraic and trigonometric calculations. In other embodiments, lookup tables storing crosswind component values for corresponding wind speeds and directions, and machine orientations may be employed. Controller 22 may increase the rotational speed of one of impellers 26 and 28, and simultaneously decrease the speed of the other of impellers 26 and 28, in order to maintain lateral broadcast boundary 44 and lateral broadcast boundary 46.
For example, for a crosswind component in direction 48, controller 22 would increase the rotational speed of impeller 26 to maintain lateral broadcast boundary 44 in order to compensate for the shift in direction 48 that would otherwise be caused by the crosswind component, and would simultaneously decrease the rotational speed of impeller 28 to maintain lateral broadcast boundary 46 in order to compensate for the shift in direction 48 that would otherwise be caused by the crosswind component.
Conversely, for a crosswind component in direction 50, controller 22 would decrease the rotational speed of impeller 26 to maintain lateral broadcast boundary 44 in order to compensate for the shift in direction 50 that would otherwise be caused by the crosswind component, and would simultaneously increase the rotational speed of impeller 28 to maintain lateral broadcast boundary 46 in order to compensate for the shift in direction 50 that would otherwise be caused by the crosswind component.
Accordingly, in view of the above, with the present invention an operator may be able to harvest in any direction, in any pattern, without the necessity of manually readjusting the speeds of impellers 26 and 28 in order to compensate for wind. In addition, because many work machines already include a GPS receiver, the present invention may provide such machines with an inexpensive system for broadcast spreading of a material from a work machine in wind conditions.
Having described the preferred 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.
