PI or PID control loop with self-limiting integrator
US5384526A · kind A · utility
36Cited by
7References
37Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 13, 1993 |
| Grant date | Jan 24, 1995 |
| Priority date | — |
| Expiry date | Jul 13, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S388/906
- WIPO fieldControl
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.