11-07-2012, 04:30 AM
Join Date: Mar 2006
Location: Schwarzenberg, Germany
Total Cats: 75
New boost control strategy in MS3 - with initial duty table, how to set...
I don't know if you have already seen, this - there is a new boost control strategy in the MS3 pre 1.2 alpha 4 with an inital boost duty value table...
Megasquirt MSEXTRA / MS3EFI • MS3 pre-1.2 alpha4 released (View topic)
How does this initial value work? (If it's possible to describe this in easy words)
It looks up your boost target, then if this new feature is enabled, it looks up the duty you want associated with that target and sets that duty. Once you are close to that target, it enables PID with the duty starting where you set.
I really thing this sounds nice and might even improve spool a bit...
So I am left with the question about how to set this inital duty table..
I had a look at some logs and tried to separte some of the dutys at specific rpm/boost(map) combinations... But this only works for a very limited part of the initial duty map (~around my main target boost - I highlighted this red in the table). I tried to inter- an extrapolate the rest of the table... Here is what I got, does this table make sense?
I really would be grateful if you could help me out with this... (It's very theoretic right now for me, as my car is in winters sleep until 1st of April 2013
I also wasn't quite sure about the scaling of that table, does my scaling for a target boost of 170kPa look right?
Be careful with this alpha 4 there seem to be bugs in CL idle, a new alpha 5 will eventually come out today...
Last edited by Zaphod; 11-08-2012 at 02:32 AM.