초록 ▼

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 inclu

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.

대표청구항 ▼

[ What is claimed is:] [1.] A system for controlling a position of an implement coupled to a work vehicle, the implement being raised by a hydraulic positioning assembly comprising an actuator and a valve assembly configured to control fluid flow to and from the actuator in response to control signa

[ What is claimed is:] [1.] A system for controlling a position of an implement coupled to a work vehicle, the implement being raised by a hydraulic positioning assembly comprising an actuator and a valve assembly configured to control fluid flow to and from the actuator in response to control signals, the system comprising:a sensor configured to detect the position of the implement and to generate a signal representative thereof;a position command device for setting a desired position of the implement; anda control circuit coupled to the sensor, the position command device, and the valve assembly, the control circuit configured to generate the control signals applied to the valve assembly to actuate the implement to the desired position, using a predetermined gain value and, after detecting undesirable movement of the implement, to modify the gain value to produce a modified gain value and generate subsequent control signals based upon the modified gain value; anda memory which stores the modified gain value, wherein the control circuit applies control signals using the modified said value to the valve assembly to actuate the implement to a subsequent desired position from the position command device.