Versatile Engine Management Systems - VEMS wiki

Older	Newer
		2007-11-02 18:10:19 . . . . MembersPage/MarcellGal [integral increase limit close to 0]
		2006-09-12 10:04:33 . . . . MembersPage/DaveBrul [format enhancements, added usefull link]
		2006-09-05 20:42:38 . . . . sc-hartnell.surrey.sfu.ca [Added http://www.learncontrol.com/simulation/ link]
		2006-09-05 14:10:45 . . . . MembersPage/PhatBob [some links on PID theory and tuning]
		2006-04-25 23:16:39 . . . . MembersPage/DanaScott [referenced an orphaned page]
		2006-04-25 18:13:49 . . . . MembersPage/DanaScott [Another PID tutorial]
		2006-04-22 22:40:17 . . . . 88-109-151-174.dynamic.dsl.as9105.com [Added some URLs gleaned from IRC conversation]
		2006-02-26 20:33:17 . . . . MembersPage/MarcellGal [IAC PID tuning; minor clarification]
		2006-02-26 20:30:28 . . . . MembersPage/MarcellGal [IAC PID tuning school]
		2006-01-15 18:02:41 . . . . MembersPage/PhatBob

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Changes by last author:

Changed:

** iac integral increase limit only effects + direction. This usually doesn't hurt even if too high

** iac integral increase limit only effects + direction. Usually close to 0. The iac should only need to go above the reference position when AC compressor is ON, and the big fan at max RPM

Changed:

Force IAC duty that maintains 200..400 RPM higher than your target. Set the reference position to this. The PID integral will operate in the negative region (that's why iac integral decrease limit is important and iac integral increase limit is not so interesting).

Force IAC duty that maintains 200..400 RPM higher than your target. Set the reference position to this. The PID integral will operate in the negative region. That's why iac integral decrease limit is important to prevent stalling. iac integral increase limit can be (and sometimes need to be, to prevent oscillation) close to zero: the iac should only need to go above the reference position when AC compressor is ON, and the big fan at max RPM.