https://m232.org/index.php?action=history&feed=atom&title=Boost_controlBoost control - Revision history2026-05-10T16:48:40ZRevision history for this page on the wikiMediaWiki 1.35.9https://m232.org/index.php?title=Boost_control&diff=87&oldid=prevPRJ: Created page with "==Algorithm== The boost controller is a fairly simple closed loop PID controller with a feed-forward map.<br/> ==Overboost== The overboost functionality is rather simple - fo..."2017-11-05T18:41:39Z<p>Created page with "==Algorithm== The boost controller is a fairly simple closed loop PID controller with a feed-forward map.<br/> ==Overboost== The overboost functionality is rather simple - fo..."</p>
<p><b>New page</b></p><div>==Algorithm==<br />
The boost controller is a fairly simple closed loop PID controller with a feed-forward map.<br/><br />
<br />
==Overboost==<br />
The overboost functionality is rather simple - for the time the conditions are met the pedal axis of of the target boost/base duty maps simply gets a fixed number added to it.<br/><br />
I don't recommend using this, and it is not included in the xdf either. To avoid it, simply always map the last two pedal positions (87/112) the same, or rescale the axis.<br />
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==Maps==<br />
* MAP Target - Target absolute pressure in kpa.<br/><br />
* Base WGDC - Feed-forward map. In steady-state conditions it should contain the duty cycle, that is needed to reach the target boost. The output of this map is in N75_REQ. Simply alter it so, that N75 and N75_REQ are as close together as possible, apart from the low rpm areas where you have to let the PID controller do it's job.<br />
* P, I, D term - they are what they say.<br />
* MAP signal too low diagnosis - If you are WOT for a certain amount of time and the MAP value does not exceed this parameter, it will throw a MAP sensor signal fault.<br />
* MAP limit - this is the soft boost cut limit. If it is exceeded, N75 will be set to 0 and a fault will be logged.<br />
* N75 upper/lower limit - min/max WGDC output.<br />
* Correction maps - IAT, pATM (atmospheric pressure) - corrects the target boost pressure as a factory based on RPM, IAT, Atmospheric pressure. There are a few variants, some of them are used based on coding plugs.</div>PRJ