Automatic control system of  laminate device based on PID

XIAN Rui，QIN Huibin
（College of Electronic Information， Hangzhou Dianzi University， Hangzhou 310018， China）

Abstract：  Aiming at automatic control of two physical parameters which include temperature and pressure in laminate device， a new type of laminate device control system， whose measurement unit was consisted of  both PT100 temperature sensor and proliferation silicon pressure sensor ，executive body was comprised of silicon controlled rectifier（SCR）and intelligent electric ball valve，  process control was completed by proportion integration differentiation（PID）regulator which controlled executive body to regulate temperature and pressure ，was designed to change both of them on basis of configured experienced craft curve In addition， PC software which follows fixed communication protocol was designed to acquire data from regulator， and to send instructions to it for convenience of analyzing data and building hierarchical system In the control filed， the optimum PID parameter was searched by the way of the critical ratio degree and the experiential trial， and the operating effect was analyzed on the basis of the coupling degree between actual work curve recorded by PC software and the rated one Many experiments result shows that the error between temperature set value and actual one is less than 1 ℃， and pressure could be stabilized in less than 002 MPa， basically actual work curve is consistent with the set curve These experimental results show that the system runs stably， and can satisfy process requirement
Key words：  laminate device; PID regulator; zerocrossing trigger; distributed control; parameter tuning