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fuel economy reading?? is it possible
Posted: Sat Mar 31, 2012 8:48 am
by Mx73
anyway for a output to show current fuel economy etc.?
Re: fuel economy reading?? is it possible
Posted: Sat Mar 31, 2012 2:56 pm
by trakkies
You need to know distance travelled for that. If you wish to have an MPG readout.
Re: fuel economy reading?? is it possible
Posted: Thu Apr 05, 2012 3:59 pm
by msiddalingaiah
A simple solution is to integrate injector pulse output over a fixed time interval. That will give you average fuel flow rate. An RC filter with a sufficiently long time constant will produce a voltage proportional to injector ON time, which is more or less the same thing. As suggested above, you will have to do your own calibration, but some measurement a little math should do.
Re: fuel economy reading?? is it possible
Posted: Fri Apr 06, 2012 12:23 am
by trakkies
My car has a factory fit OBC which gives an MPG readout, both average and instantaneous, by measuring how long one injector was open and a feed from the speedo sensor. The original injection didn't use PWM.
MS stopped this working properly. I tried various filter circuits to replicate the original pulsed DC, but got nowhere.
The answer was to time the current flow in the +12v feed to one injector.