Apparatus and method for preventing runaway of the integral...

Details Apparatus and method for preventing runaway of the integral... Apparatus and method for preventing runaway of the integral...

G - Physics

05

B

341/114

G05B 6/02 (2006.01) G05B 5/01 (2006.01)

Patent

CA 2034474

- 18 - ABSTRACT OF THE DISCLOSURE An apparatus and method are provided for preventing the runaway of the integral term of a proportional integral differential controller which is usable in a feedback system. An error signal is supplied to the controller by the feedback system. The controller produces a control variable output signal from the error signal. In accordance with the invention. the controller imposes a slew rate limit on the control variable output signal. Also in accordance with the invention, whenever the controller attempts to drive the control variable output signal to exceed the slew rate limit, the integral term associated with the controller is adjusted to a value which forces the control variable output signal to its slew rate limited value In this manner, runaway of the integral term associated with the controller is desirably avoided.

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