Electrohydraulic valve servomechanism with adaptive...

Details Electrohydraulic valve servomechanism with adaptive... Electrohydraulic valve servomechanism with adaptive...

2008-05-27

2008-05-27

Bastianelli, John (Department: 3753)

Valves and valve actuation

Electrically actuated valve

Remote or follow-up control system for electrical actuator

C251S129050, C318S599000, C361S160000

Reexamination Certificate

active

07377480

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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