Title:
PI CONTROL SYSTEM FOR SAMPLE VALUE
Document Type and Number:
Japanese Patent JPH01126701
Kind Code:
A
Abstract:
PURPOSE:To suppress the jump of operating quantity to the rapid change of a target value only with causing an integrating operating gain to be smaller than a proportional operating gain by determining the change of the operating quantity to the step change of the target value with the time constant of integrating operation. CONSTITUTION:A digital controller 1a inputs a target value r(k) and a sample value c(k) of control quantity and calculates operating quantity m(k) to cause both values to be coincident. The operating quantity m(k) is composed of the sum of a K1{r(k)-c(k)}, which is obtained by multiplying an integrating operating gain K1 to difference between the operating quantity m(k-1) before one sample, the target value r(k) and the control quantity c(k), and a Kp{c(k-1)-c(k)}, which is obtained by multiplying a proportional operating gain Kp to the difference between the control quantity before one sample and the present control quantity. By causing the integrating operating gain K1 to be smaller than the proportional operating gain Kp, even when the target value r(k) is rapidly changed, the value of an increased part DELTAm(k) of the operating quantity is small and the operating quantity m(k) is only increased smoothly.
Inventors:
YAMAMOTO AKIMASA
MIYASHITA TAKESHI
MIYASHITA TAKESHI
Application Number:
JP28582387A
Publication Date:
May 18, 1989
Filing Date:
November 11, 1987
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
G05B21/02; G05B11/42; (IPC1-7): G05B11/42; G05B21/02
Attorney, Agent or Firm:
Masuo Oiwa (2 outside)