AN ELECTRO-HYDRAULIC PROPORTIONAL FLOW VALVE SPEED REGULATING CONTROL SYSTEM AND ITS METHOD

摘要

An electro-hydraulic proportional flow valve speed regulating control system includes a PWM regulating device, an electro-hydraulic proportional flow valve, a hydraulic executing element, a speed measuring module, an electro-hydraulic proportional flow valve characteristic measuring module, and a feedforward control module. The speed measuring module measures a speed of the hydraulic executing element and sends the measured result to the electro-hydraulic proportional flow valve characteristic measuring module which measures a minimum actuating current and a maximum actuating current of the electro-hydraulic proportional flow valve and a maximum speed of the hydraulic executing element and inputs these measured results to the feedforward control module. With these measured results, the feedforward control module establishes a corresponding relationship between the speed of the hydraulic executing element and the valve core current and inputs the valve core current in correspondence with the setting speed value to the PWM regulating device, thereby driving the electro-hydraulic proportional flow valve.