首页|PID spotlight, part 7: Open-loop tuning of a self-limiting process
PID spotlight, part 7: Open-loop tuning of a self-limiting process
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NETL
NSTL
There are three common methods used to tune control loops, open loop, closed loop, heuristics. There is considerable published literature on open- and closed-loop tuning methods, and all control textbooks cover open- and closed-loop tuning. Heuristics methods are not well covered. Each has its place in your toolbox, and there are concepts unique to each method that will help you think critically about control-loop performance. Open-loop tuning is generally the best choice when you have a "cheerfully start over" situation, either a new control loop or one where the process has been significantly modified. Existing control loops that just need to be trimmed up are best approached using heuristics. Closed-loop tuning should be avoided, however, if you happen to walk up to a loop that is already swinging, you have all the information you need to use closed-loop tuning rules.
NETL
NSTL
