A Study on the Pressure Control Characteristics of ON/OFF 3-way Solenoid Valve Driven by PWM Signal

개폐식 3방향 전자밸브의 펄스폭 변조 구동에 의한 압력제어 특성에 관한 연구

Pressure control is possible driving a simple ON/OFF 3-way valve of hydraulic servo system by pulse width modulation signal. But the pressure varies according to the duty ratio and carrier frequency and repeated on-off action induces pressure fluctuation. So equations for mean pressure and ripple amplitude are theoretically derived as a function of on/off time, the system parameters which decide the pressure characteristics are arranged and they are verified by experimental study. As the result selection criteria for the major design parameters are established and the basic strategy to suppress the unnecessary fluctuation can be provided for a hydraulic pressure control system using these type of valves.