Plant performance control system - has proportional-integral controller using quotient of control error rate of change and control error

摘要

A control device with a proportional-integral controller provides greater control efficiency than conventional proportional-integral and proportional-integral-differential controllers, in partic. as used in charging process systems. In such applications variations in input rate or material clogging can impair the control efficiency of conventional regulators with linear parameters, integral and rate time constants adjusted to ideal system performance. A processing circuit forms the quotient of the control error rate of change and the control error and adds it to the input or output signal of the proportional-integral controller.