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Old 02-12-2010, 11:12 PM   #81 (permalink)
landspeed
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Join Date: Jan 2008
Location: NZ
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Bluey II - '89 Nissan Bluebird 2.0iZX
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My car has these kind of injectors too; a basic way to do this would be to assume the injector is 'on' when it falls below 10 volts, and 'off' when it goes above 10 volts *and doesn't go below 10 volts for 0.5 milliseconds*. Then you would have all your injector readings reading 0.5ms too high, but the software would subtract 0.5ms from all readings to correct for this.

(I'm assuming that 1ms = the large squares on the graph above).

This may be difficult if the ATMEL 'trigger' feature is being used to detect injector on / off phases; if this is the case, and enough spare CPU power is not present, a seperate device could be made, with a basic CPU, which does the above processing, and outputs a signal to the MPGuino. A setting in the configuration of the MPGuino would the correct for the fact that the injector readings are too long!

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1989 Nissan Bluebird Auto - slowly becoming more economical and more extreme

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