Boost control: Open loop -> closed - why?
I have read a bunch about boost control on the megasquirt and most of the time it tells you to tune open loop first before moving to closed loop. Aside from knowing what duty cycles result in what boost and thus knowing that your EBC is set up correctly, what is the importance? It seems to be mostly irrelevant once you verify the EBC polarity.
I am running closed loop now without ever doing open loop. I am thinking of going back to at least get something reasonable loaded into my MSQ, but I am having a hard time justifying why when my closed loop seems to be working. |
what are you reading?
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Boost Control
Closed-loop Tuning Tips This section reviews some tips for tuning closed-loop boost control. Tuning closed-loop boost control should be done in two steps:
Those to start - for example. Maybe it's just what most people have done to find success, but I don't think you necessarily have to do open loop. |
has ms3, reads ms1 crap.
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tuning open loop when you have MS3 closed loop is like jerking off when you have a horny supermodel laying next to you naked.
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Agree. Would not bother at all with MS3. It has a full PID algorithm that works.
With MS1, the control algorithm is integral-only. Over much of the map, you HAVE to run open loop, otherwise you get integral-windup that causes big boost excursions. That's why the thread title specifically states MS1. |
MS3 dox for you.
Though you said it's already working, for everyone else that finds this thread this is what you should be reading. |
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