13-03-2011, 14:40
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systems engineer (retired)
no team
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Join Date: Nov 2009
Rookie Year: 1969
Location: US
Posts: 8,101
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Re: PID Loops
Quote:
Originally Posted by Chris27
Computing the integral is a bit more involved. You can use Fourth order Runge-Kutta to estimate the integral
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"Euler's Method is the most common integration method for control systems . Control methods such as PID do not need exact integration to work well. This is because the purpose of the integral is usually to force the average error to zero to ensure that the controlled signal matches the command signal over long periods of time. Only rarely is there a need to control the integral of a signal. In those cases you may need a more accurate integration method."
Control System Design Guide
Second Edition
George Ellis
Page 82
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