Patent ID: 6173572
Filing Date: 2001-01-16
Classification: E02F,F15B

Abstract:
An apparatus adapted to control the fluid flow in a fluid circuit, comprising:a variable displacement pump adapted to receive a pump displacement command, and responsively deliver an actual fluid flow to the fluid circuit;a fluid actuator;a control valve connected between said pump and said actuator, said control valve adapted to receive a control valve command signal and responsively control a position of said control valve;a bypass control valve connected between said pump and a tank, said bypass control valve adapted to receive a bypass valve command signal and responsively control a position of said bypass valve; anda controller adapted to establish a desired fluid flow, determine an expected fluid flow from said pump in response to said desired fluid flow, compare said desired fluid flow and said expected fluid flow, generate a bypass control valve command signal in response to said comparison, and generate said pump displacement command signal and said control valve command signal in response to said desired fluid flow.