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How much noise is in a automobiles ecm? — Parallax Forums

How much noise is in a automobiles ecm?

RogRog Posts: 1
edited 2006-05-20 20:26 in BASIC Stamp
I would like to hook up my project in between a car's ECM and injectors, to count the pulses.· I wander how much bounce or noise the ecm has controlling the injectors?

Comments

  • FranklinFranklin Posts: 4,747
    edited 2006-05-20 20:14
    How much noise does an animal make when you give it a bath? How about the make model and year of the vehicle? You will probably need something in the circuit to condition the output of the ECM.

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    - Stephen
  • Jim RicheyJim Richey Posts: 82
    edited 2006-05-20 20:26
    Hello Rog

    You will find quite a bit of noise in the injector driver circuit.This is mainly because the injectors are solenoids,coils that induce stray currents at a sometimes problematic level.
    The on board ECM is made to filter out the trash.
    The safest route to pull a signal from the line might be with an optocoupler.

    Good Luck, Jim Richey

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    Thanks, Parallax!
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