Passive load and active velocity based flow compensation for a hydraulic tractor hitch
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United States of America Patent
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May 5, 2015
Grant Date -
Feb 5, 2015
app pub date -
Aug 5, 2013
filing date -
Aug 5, 2013
priority date (Note) -
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Abstract
A hitch on a vehicle is raised and lowered by a hydraulic actuator controlled by an electrically operated valve. A control system receives a command that indicates a designated velocity and uses the command to operate the valve. Based on a reference external force exerted on the hitch, the control system is configured with relationships for converting a plurality of command values to corresponding electric current levels for operating the valve. The control system compensates for effects due to differences between the actual force acting on the hitch and the reference external force. Velocity feedback adjusts the electric current level applied to the valve. The passive load force control provides a predictor of the hitch load force to eliminate overshoot/undershoot of hitch motion. During hitch motion, the velocity feedback also compensates for effects due to load and hitch geometry changes that occur.
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