Modeling and Simulation Research of Novel Piezoelectric Type Pneumatic PWM Digital Proportional Valve

The traditional electro-pneumatic PWM proportional valve driven by electro-mechanical converter of electromagnet has the disadvantages of slow response and poor control precision etc.To solve this problem,a novel piezoelectric type pneumatic PWM digital proportional valve driven by the electro-mechanical converter of piezoelectric stack was proposed.The mathematics model of PWM proportional valve was set up and its simulation model was built by means of Matlab/Simulink.By the comparison of simulation and experiment results,the built mathematical model was proved to be accurate.Moreover,the effect of pilot valve core displacement,PWM carrier frequency and PID control to the PWM valve performance was researched by simulation,which will provide theoretical steering to further optimize the valve structure parameters and the choice of control parameters.