Switching Response Improvement of a High Speed On/Off Solenoid Valve by Using a 3 Power Source Type Valve Driving Circuit

High speed on/off solenoid valves have often been used for pressure control or flow control in hydraulic servo systems for automobiles or construction machines. These systems require faster valve switching speed to improve control preciseness. The authors have designed and manufactured an electronic valve driving circuit with fast response characteristics by using a 3 power source. In experiments using a hydraulic system incorporating the new valve driving circuit, the new circuit shortened the switching delay time from 5 ms to 1.55 ms. Also, the hydraulic system with the new circuit showed excellent position tracking control performances.