Title:
CONTROL ARITHMETIC UNIT AND CONTROL ARITHMETIC METHOD
Document Type and Number:
Japanese Patent JP3437807
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce overshooting, even when disturbance where the changing speed of controlled variables is fast is impressed.
SOLUTION: A subtracting part 3 subtracts controlled variables PV from a set value SP and outputs a deviation Er. When the absolute value of the deviation Er is increased, a disturbance impression detecting part 4 decides that disturbance has been impressed. When the impression of the disturbance is detected, a deviation correction value calculating part 5 calculates a deviation correction value Erx by multiplying the deviation Er with a prescribed rate. A deviation correction value convergence calculating part 6 performs convergence arithmetic operation, so that the deviation correction value Erx can be converged gradually to '0' under a fixed rule. A control arithmetic part 7 performs PID arithmetic operation, based on a value obtained by subtracting a deviation correction value Erx' after the convergence arithmetic operation from the deviation Er, and calculates manipulated variable MV.
Inventors:
Masato Tanaka
Application Number:
JP29504199A
Publication Date:
August 18, 2003
Filing Date:
October 18, 1999
Export Citation:
Assignee:
YAMATAKE CORPORATION
International Classes:
G05D13/60; G05B5/01; G05B11/36; G05B11/42; G05B13/02; (IPC1-7): G05B11/36; G05B13/02
Domestic Patent References:
| JP1165605A | ||||
| JP11224104A | ||||
| JP7219646A | ||||
| JP390304U |
Attorney, Agent or Firm:
Masaki Yamakawa