Hi Alain,
Talking about the Fuel Consumption, have you ever had success on using the following formula to do that ?
( Injector_"on"-time / Fixed_time_interval ) * Revolution time * calibration_constant = L/km.
After some long time and some good experiences (and some bad . . .) me and Sylvio (more Sylvio than me), could calculate the fuel consumption using the Darrel´s Instant Interrupts.
We are reading the car´s speed (via timer 0), setting a 500 ms timer and reading the Injector´s in-time via CCP1 (I´m using a 16F877 and Sylvio a 16F88).
We are using the formula above to calculate the consumption, we are assuming that we have 2 injectors firing on each engine´s revolution.
Everything is ok, but Sylvio told me that when he is driving at 130 Km/h, the formula gives something like 30 Km / Liter (he did a modification on the formula to get this) What is really high (amazingly high…), since he is burning alcohol instead of gasoline.
Do you know if measuring just the on-time of one injector and the speed are really enough ?
Thank you !
Sérgio
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