Pressure Sensor (Was: Injecor impedance?)

Andrew R. Ghali andrewg at 16paws.com
Mon Dec 4 17:04:34 GMT 2000


On Mon, 04 Dec 2000 12:03:43 -0000, "Klas" <perkelpuk at hotmail.com> wrote:
>...
>A couple of more things:Is it a lot of oscillating going on in the pressure 
>sensor signal? Plan to sample once per revolution and i do not want a lot of 
>difference between the different revs. How many loadsites do you´need to 
>regulate the fuel decently (was thinking of 8 rpm and 8 map total of 64 
>sites), of course many are better but what can be sufficient, as I dont want 
>the mapping to take all day.

I would guess that you're seeing the individual intake cycles that are not
overlapping.  You'll probably need to either a) analog low-pass filter the
signal, b) digital low-pass filter the signal or c) select an exact time
relative to the crank each revolution to sample (probably not the best
solution).  Option (b) would be the most optimal because it's easy to "fix"
and if you're really good, you can base the filter on the RPM and the engine
characteristics to get much faster response.

Hope this helps-

Andrew
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