Performance test system of positive displacement pump based on fuzzy PID control

QI Ji-bao1, SHEN Hong-yao2, HUANG Ye1
(1.School of Mechanical Engineering, Zhejiang Industry Polytechnic College, Shaoxing 312000, China;
2.College of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract: Aiming at the uncertainty of environment, temperature and water quality and the needs of classification tests in the test system of the performance of the positive displacement pump for crop protection machinery, the test system consisting of pneumatic diaphragm regulating valve,loop control for water regulation, was designed. And the mass method was used to measure. The control method of adjusting the pneumatic diaphragm regulating valve to maintain the constant pressure of the outlet water was researched, a hybrid fuzzy PID control strategy was proposed, and the fuzzy PID controller was designed, which was applied to the constant pressure control system based on configuration software, programmable controller and high precision instruments. The traditional PID control and the fuzzy PID control were realized respectively by PLC programming, and the two control methods were tested separately. The results indicate that the fuzzy PID system has faster response speed, lower overshoot by about 20%, higher work efficiency by about 30%, meet the test requirements, and has high reliability.
Key words: positive displacement pump; working performance; test system; constant pressure control; fuzzy PID