摘要:
A farming system which identifies the boundaries of agricultural fields and performs functions based upon whether a vehicle is located within a particular field is disclosed. The system includes a location signal generation circuit which receives positioning signals and generates location signals representative of the location of the vehicle. The system further includes a memory circuit which stores geo-referenced digital maps of the fields and may include boundary data or application maps for each field. The system further includes a control circuit which compares the location signals to the data stored in the memory circuit to determine when the vehicle is located in a particular field. In one embodiment, the control circuit selects a variable-rate application map for the particular field and generates variable-rate control signals from the map data which are applied to a variable-rate applicator. In another embodiment, the control circuit stores characteristic data sensed by a sensing circuit with correlated location signals in a geo-referenced digital map for the particular field. In another embodiment, the control circuit generates height control signals to raise and lower an agricultural tool such as a tractor plow or a combine header based upon relationships between the location of the tool in a field and the location of attributes in the field such as field boundaries or obstructions.
摘要:
A control system for controlling outputs associated with off-road vehicles is disclosed herein. The outputs are actuated by actuators in response to control signals generated by a control circuit. In a normal mode, the control circuit generates the control signals based upon command signals generated by operator-actuatable command devices, and applies the control signals to the actuators to control the outputs. In a record mode, the control circuit stores a sequence of commands in a memory circuit to record the sequential actuations of the command devices. Then, in a playback mode, the control circuit generates the control signals based upon the recorded command sequence instead of the command signals. Playback can be triggered manually by a playback switch, or automatically based upon the geo-graphic position of the off-road vehicle. The control system can record and playback more than one command sequence. Each sequence step generates a recorded command which can depend upon a recorded event based upon values of a timer, geographic position or feedback signal. In addition, the operator can erase, view and edit the commanded sequences. The operator can also download and upload command sequences.
摘要:
A control system for a hitched or trailed implement coupled to a work vehicle is disclosed herein. The control system allows control to be selectively transferred between various types of implements by use of a hydraulic selector valve. An electronic control unit controls the actions of a hitch assembly actuator, a trailed implement, an auxiliary device, or some combination thereof as determined by the configuration of the hydraulic selector valve.
摘要:
A system for reducing oscillations of an implement carried by a vehicle in a lifted position during travel. The implement is coupled to an implement positioning system including an actuator for raising and lowering the implement in response to a control signal. The system includes at least one load sensor for sensing implement load, a position sensor for sensing implement position, and a control circuit configured to generate a control signal to the actuator in a first manner based at least upon implement position and in a second manner based at least upon implement load. The control circuit transitions from the first manner of operation to the second manner of operation upon detecting oscillations of the implement beyond a predetermined magnitude. The control circuit improves roadability of the vehicle by operating in a roadability mode including the first and second manners of operation wherein the roadability mode is entered based at least upon the implement being in a lifted position and vehicle speed being greater than a predetermined threshold speed.
摘要:
An apparatus and method is disclosed for wireless remote control of an output element coupled to a work vehicle. The output element performs work external to the vehicle and is actuated by an actuator controlled by an output controller in response to at least a remote control signal. The apparatus includes a wireless remote transmitter movable with respect to the vehicle and a wireless receiver supported by the vehicle. The transmitter has an actuatable input device for generating a command signal, a transmitter antenna, and a transmitter control circuit which receives the command signal from the input device, generates the remote control signal in response to the command signal, and applies the remote control signal to the transmitter antenna for wireless transmission to the work vehicle. The receiver includes a receiver antenna and a receiver control circuit which receives the remote control signal from the receiver antenna after transmission by the transmitter, and applies the remote control signal to the output controller.
摘要:
A system or method for controlling the position of an implement coupled to a work vehicle. The implement is moveable by a hydraulic positioning assembly including an actuator and a valve assembly which control the flow of fluid to the actuator in response to control signals. The valve assembly includes raise and lower valves, each valve requiring a control signal equal to a threshold value before the valve opens and fluid begins to flow. The system includes a sensor to detect the position of the implement and a control circuit. In response to a change in a position command, the control circuit applies a control signal to the appropriate raise or lower valve based upon the respective threshold value. The control signal is generated by using a predetermined gain. When undesirable implement movement such as an overshoot condition is detected, the control circuit modifies the gain value. The modified gain value is used to generate subsequent control signals for actuating the implement.
摘要:
A system or method for controlling the position of an implement coupled to a work vehicle. The implement is moveable by a hydraulic positioning assembly including an actuator and a valve assembly which control the flow of fluid to the actuator in response to control signals. The valve assembly includes raise and lower valves, each valve requiring a control signal equal to a threshold value before the valve opens and fluid begins to flow. The system includes a sensor to detect the position of the implement and a control circuit. In response to a change in a position command, the control circuit applies a control signal to the appropriate raise or lower valve based upon the respective threshold value. The control signal may include a component for moving the implement at a desired rate of movement. After undesirable implement movement is detected, the control circuit modifies the threshold value. The modification may occur when the control circuit detects that the implement is moving at an excessive rate due to the effects of valve hysteresis and implement weight. The control circuit may detect the undesirable movement by determining that the position error value is more negative than a predetermined value.
摘要:
A hitch assembly control system including an actuator which positions the hitch assembly in response to control signals provided to an electrically driven actuator. The control system further includes an electronic controller operated under the influence of a program for deriving the control signals for the actuator from a series of inputs which monitor and measure various performance criteria. The program functions to operate the hitch assembly in a plurality of different operating states. In a DRAFT state, the hitch assembly position is controlled under the influence of at least four independently set variables. The control system of the present invention is capable of calibrating the hitch assembly configuration as well, as the limits of hitch assembly operation. Moreover, the control system of the present invention is capable of detecting, categorizing and recording failures which occur in various states of hitch assembly operation. The control system of the present invention furthermore is capable of maintaining a substantially constant rate of elevational movement of the hitch assembly regardless of the weight of the ground engaging assembly attached to the hitch assembly.
摘要:
A system or method for controlling the position of an implement coupled to a work vehicle. The implement is moveable by a hydraulic positioning assembly including an actuator and a valve assembly which control the flow of fluid to the actuator in response to control signals. The valve assembly includes raise and lower valves, each valve requiring a control signal equal to a threshold value before the valve opens and fluid begins to flow. The system includes a sensor to detect the position of the implement and a control circuit. In response to a change in a position command, the control circuit applies a control signal to the appropriate raise or lower valve based upon the respective threshold value. The control signal may include a component for moving the implement at a desired rate of movement. After undesirable implement movement is detected, the control circuit modifies the threshold value. The modification may occur when the control circuit detects that the implement is moving at an excessive rate due to the effects of valve hysteresis and implement weight. The control circuit may detect the undesirable movement by determining that the position error value is more negative than a predetermined value. The modified threshold value then replaces the threshold value for subsequent implement movement. The new threshold value prevents the undesirable movement in subsequent implement movement.
摘要:
A control system for engaging, disengaging and re-engaging a front wheel drive in an agricultural vehicle includes a control circuit configured to receive signals representative of vehicle operating parameters and to generate control signals corresponding to the desired state (i.e. engaged or disengaged) of a front wheel drive engagement circuit. Sensors are associated with the rear wheels, rear service brakes, implement positioning circuit, the vehicle body and the front axle to provide parameter signals related to wheel speed, braking, implement position and vehicle speed. Control logic executed by the control circuit in a continuously cycled routine determines the desired state of the engagement circuit based upon all operating parameters. The control circuit applies an appropriate control signal to the engagement circuit causing engagement or disengagement in accordance with the desired state.