[Diy_efi] Timing Calculations
nospam at higginstribe.com
Wed Jun 15 21:57:26 CDT 2005
Before people get off on more of a tangent with 60 tooth trigger
wheels. Thanks for all the discussion and calculations. I also want to
factor that all of your calculations are based on the worst case
scenario, that timing will come at the farthest point from the trigger
wheel. Obviously the deviation from the actual and desired event time
will start at 0 from the trigger point and reach the greatest error just
before the next trigger point.
Anyway, it seems pretty obvious to me then that I should build in some
sort of rpm prediction calculations, possibly based on throttle (or MAP)
changes if I want them to be quick. Of course, I'm more worried about
injector timing then ignition timing. I can't move the injector off
time (or at least I shouldn't, much) which means I need to fairly
accurately predict the on time based on what I currently know about the
acceleration/deceleration, and I need to predict that on time, possible
most of a engine cycle ahead of the injector off time.
This means I'm going to have to sit down and seriously think about the
logic I'm going to use to reduce this problem as much as possible.
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