Electrohydraulic valve servomechanism with adaptive resistance estimator
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United States of America Patent
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May 27, 2008
Grant Date -
Sep 29, 2005
app pub date -
Mar 18, 2005
filing date -
Mar 25, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A servomechanism includes a controller which dynamically estimates the resistance of the solenoid coil in an electrohydraulic valve as part of determining a level of electric voltage to apply to open the valve. The servomechanism receives a current setpoint designating a desired electric current level and senses the actual level of current flowing through the coil. A proportional term is derived from the current setpoint and the actual level of current. Creation of a derivative term is based on the difference between the current setpoint and the actual level of current. A feedforward term is produced by estimating the resistance of the electrohydraulic valve and limiting the feedforward term to a predefined range of acceptable values. The proportional term, derivative term, and the feedforward term are summed to define a desired voltage level, and a PWM signal for driving the electrohydraulic valve is generated based on the desired voltage level.
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