Characteristic Research On The Modified Pneumatic Digital Valve With Rotating Plate

As the digital control technology develops rapidly, direct digital control technology has been popular studied on control of the digital/servo valve pressure control system. Aiming at the disadvantages which appeared in previous applications of the pneumatic control valve, its key mechanical parts were newly designed, and a new drive and control PCB circuit board were designed, based on the original digital valve, which effectively improve its air-pressure characteristics and controllability. Characteristics test based on the pneumatic digital valve was carried out. The results illustate that, the controllability of open and close loop of the modified pneumatic digital valve is satisfactory, its output pressure is stable.The main work and outcome of the thesis list as follows:1. Aiming at the disadvantages which appeared in previous applications of the pneumatic control valve, its key mechanical parts were newly designed, a new control method was introduced and a digital PID control method was used;2. Designed a new pneumatic digital valveís drive and control circuit board. The board Integrated on-line communication, stepping motor control and air pressure measurement in it;3. Put forward a mathematical model of the modified pneumatic digital valve and its characteristics test experiment platform, and carried out the relevant simulink experiment of the digital valve;4. Built the characteristic test platform of the modified pneumatic digital valve, carried out the open and close loop experiment of the valve, analysed the response of its output pressure, and did some comparasions of charateristics based on the different experiment objects;5. Optimization of the modified pneumatic digital valve will help promote the further study of pneumatic serve system and the direct digital control technology.