MOST SUITABLE VALUE ARITHMETIC SYSTEM OF PID CONTROL PARAMETER IN ASTATIC SYSTEM PROCESS

摘要

PURPOSE:To conduct a most suitable control without exerting a harmful influence upon a process, by computing a PID control parameter most suitable value on the basis of the area surrounded with a pulse resronse curve of an astatic system process and with a straight line showing a setting value and on the basis of the sum of a delay constant of the aforegoing response curve. CONSTITUTION:A process control system 1 is composed of a adjusting part C, an operating part FC and a process P, and works so that a process output PS coincides with a set value SO. When finding a PID parameter of the adjusting part C, a pulse signal TS is added to the operating part FC by means of a switch SW connected on the side of a test signal generator TD, and a response is obtained by a response characteristic detector RP. The aforesaid area is found on the basis of the response curve by means of a characteristic area computer SC. A most suitable parameter value is further found by a PID parameter computer TC, and is indicated in an indicator DP.