Some thoughts and questions on EFI
OADDAB at STDVAX.GSFC.NASA.GOV
Thu May 5 18:45:56 GMT 1994
Before we decide on what computer to use etc shouldn't we decide what the
operating enviroment or rather the requirements are?
Ouput would be a PWM signal to the injectors. You could vary the start
time and the end time of each injector to get sequential port injection.
For input I suspect we'd need:
O2 sensor - what better way to set the car for part throttle cruise.
Throttle Position sensor
RPM sensor - maybe an engine position sensor - so you know exactly which
cylinder needs fuel / spark next (distributer mounted of course).
and then either a MAP or MAF sensor.
maybe Humidity sensor? - or altimeter?
Is that all?
If that is all perhaps we could also get an idea on what kinda of data
rates are needed.
02 sensors react relatively slow - maybe 10 readings a sec?
TPS - sensors - at least 10 readings a second if not more
Temp sensors - 1 reading a second
RPM sensor - at 10,000rpm (why not?) - that 600,000 degrees per second. 4
bumps on the crank shaft (ie - crank triggered ignition) would mean less
than 1000 per second...
MAP or MAF sensor - 1 per second - maybe more... 10?
The system would have to work at:
part throotle cruise
Next post what would the algorithm be like?
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