Accession Number : AD0688795

Title :   COMPARING AND TUNING PI AND PID DIGITAL CONTROL ALGORITHMS.

Descriptive Note : Technical rept.,

Corporate Author : LOUISIANA STATE UNIV BATON ROUGE COLL OF ENGINEERING

Personal Author(s) : Shendrikar,Uday D. ; Smith,Cecil L. ; Murrill,Paul W.

Report Date : JUN 1969

Pagination or Media Count : 26

Abstract : For years engineers have followed the practice of installing proportional-plus-integral (PI) controllers in the 'normal' control loops and proportional-plus-integral-plus-derivative (PID) controllers in the 'tough' control loops--usually slow loops involving temperature. The typical reason given is that the additional cost of the derivative mode could only be justified in difficult control loops. Another reason is that the PID controller is much more difficult to tune, and engineers would prefer not to undertake it unless necessary. With the advent of direct digital control systems, the increased cost of using a PID algorithm instead of a PI algorithm is negligible, and only the tuning problem remains. Perhaps automated tuning procedures will be perfected in the future to eliminate this problem, but for the present, some guidelines are needed for determining when and how PID and PI algorithms should be used. This report attempts to answer some of these questions about PI and PID algorithms. (Author)

Descriptors :   (*ADAPTIVE CONTROL SYSTEMS, ALGORITHMS), PRODUCTION CONTROL, DIGITAL SYSTEMS, AUTOMATION, FEEDBACK, CORRELATION TECHNIQUES

Subject Categories : Statistics and Probability
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE