Misc 101 Information

[jdzura at csc.com]

I have been following the posts with interest, but the one thing I have not seen
is what processor is run in the thing?

Joe




nacelp at bright.net on 05/04/98 12:01:33 PM

Please respond to diy_efi at efi332.eng.ohio-state.edu

To:   diy_efi at efi332.eng.ohio-state.edu
cc:    (bcc: Joe Dzura/SED/CSC)
Subject:  Misc 101 Information




In case you were ever curious, how often the ecm "looks" at
things.
The ECM never stops polling the sensors.  Under certain conditions, it might
ignore a measured value though.  Here's how often the XYZ
ecm samples the inputs:
MAP is sampled 160 times a second.
O2 is sampled 160 times a second.
VSS (MPH) is sampled every VSS pulse (up to 80 times a second.)
RPM is computed 80 times a second (in the spark code.)
TPS is sampled 80 times a second.
Battery voltage is sampled 10 times a second.
CTS is sampled 10 times a second.
ALDL is sampled 10 times a second.
MAT is sampled 10 times a second.
MPH is computed 10 times a second.
Fuel and spark are computed 80 times a second - on alternate 160 Hz beats
Most of these sampled items are filtered, so the value used for
further computations won't change as fast as the sample rate
Cheers
Bruce