HYDRAULIC SYSTEM CONTROL METHOD USING DIFFERENTIAL PRESSURE COMPENSATION DISCHARGE COEFFICIENT

摘要

PROBLEM TO BE SOLVED: To provide a hydraulic system control method to generate an accurate magnitude current for opening a solenoid control type valve to a proper angle.

SOLUTION: The hydraulic system has electrohydrostatic valves (21-24) to control a flow rate of fluid for operating a cylinder or a hydraulic actuator (16) like a motor. One set of characteristic data for describing performance of the electrohydrostatic valves (21-24) are provided. The hydraulic system is operated by specifying a desired motion of the hydraulic actuator (16) and according to lead-through of a desired valve flow rate factor to specify a level of a flow rate of operation liquid flowing through the electrohydrostatic valves (21-24). A compensation control signal is generated by a desired valve flow rate factor and characteristic data since a change of a differential pressure corresponds to an effect operated on a fluid flow rate. The electrohydrostatic valves (21-24) are activated according to a compensation control signal.

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