PI or PID control loop with self-limiting integrator

Details PI or PID control loop with self-limiting integrator PI or PID control loop with self-limiting integrator

1993-07-13

1995-01-24

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

'reset' systems

318609, 318611, 388906, 388903, G05B 1142

Patent

active

053845269

ABSTRACT:
A control system having proportional and integral functions for controlling the rotational speed of a motor. The system includes a self-limiting integrator for avoiding or limiting integral wrapup, a problem commonly associated with integral control. The self-limiting integrator includes an integrator, limit comparator, OR gate, delay circuit, and sign reversal circuitry. The integrator reverses direction of integration when an error limit is realized. The error limit, a preestablished and adjustable value, can be used to determine the rise and settle time of the speed of the motor independently of the gain.

REFERENCES:
patent: 4319173 (1982-03-01), Rhodes
patent: 4872104 (1989-10-01), Holsinger
patent: 4893068 (1990-01-01), Evans, Jr.
patent: 5134354 (1992-07-01), Yamamoto et al.
patent: 5223778 (1993-06-01), Svarovsky et al.
patent: 5231341 (1993-07-01), Sang-Gwon
patent: 5265188 (1993-11-01), Andoh

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