초록 ▼

The present invention provides a method and apparatus for controlling the fluid flow in a fluid circuit 102. The fluid circuit 102 includes a pump 32 driven by an engine 106. The pump 32 delivers fluid to at least one actuator 44, 45 through a control valve assembly 120, 122. In addition, the pump i

The present invention provides a method and apparatus for controlling the fluid flow in a fluid circuit 102. The fluid circuit 102 includes a pump 32 driven by an engine 106. The pump 32 delivers fluid to at least one actuator 44, 45 through a control valve assembly 120, 122. In addition, the pump is connected to a bypass control valve, which is connected to a fluid tank. The method includes the steps of establishing a desired fluid flow to be delivered by the pump, determining an expected fluid flow to be delivered by the pump in response to the desired fluid flow, and determining a position of the bypass control valve in response to the expected fluid flow.

대표청구항 ▼

[ What is claimed is:] [1.] 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

[ What is claimed is:] [1.] 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.