Control loop instability detection and correction apparatus

Details Control loop instability detection and correction apparatus Control loop instability detection and correction apparatus

1988-03-10

1989-12-05

Lastova, John R.

Boots, shoes, and leggings

364176, 364183, 364184, 364153, 318563, 318611, 318635, G05B 2102

Patent

active

048856762

ABSTRACT:
The control loop instability detection and correction apparatus monitors an error signal produced by a control system to detect any instability in the control loop before the instability significantly affects the performance of the controlled apparatus. This is accomplished by monitoring the error signal to detect a change in the error signal greater than a predetermined limit and to tabulate the number of times the change in the error signal is in excess of the predetermined limit over a fixed period of time. Whenever the change in the error signal is in excess of the predetermined limit, it is reduced in magnitude to a predetermined value and this resultant signal is applied to the controlled apparatus in place of the originally generated error signal. In addition during each sampling time interval, the result of this comparison is used to increment or decrement a counter. If the change in the error signal is in excess of the predetermined limit, the counter is incremented to indicate the number of times that the change in the error signal has exceeded the predetermined limit. If, on the other hand, the change in the error signal is less than the predetermined limit the counter is decremented to indicate that the error signal is within the allowable limits of magnitude. If this count tabulated by the counter exceeds a predefined threshold, an alarm indication is activated to note possibility of instability in the operation of the controlled apparatus.

REFERENCES:
patent: 3724720 (1973-04-01), Bullivant
patent: 3974364 (1976-08-01), Sallberg
patent: 4124848 (1978-11-01), Clark et al.
patent: 4344128 (1982-08-01), Frye
patent: 4347572 (1982-08-01), Berwick, Jr. et al.
patent: 4374423 (1983-02-01), Kundler et al.
patent: 4404505 (1983-09-01), Swanson et al.
patent: 4631683 (1986-12-01), Thomas et al.
patent: 4730313 (1988-03-01), Stephenson et al.
patent: 4742465 (1988-05-01), Eastman
patent: 4774669 (1988-09-01), Schmitz et al.

Affiliated with

Also associated with

Rating

Control loop instability detection and correction apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Control loop instability detection and correction apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control loop instability detection and correction apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2038197