Delimiter project - frequency divider problem

Discussion in 'The Projects Forum' started by Hrenowsky, Aug 14, 2011.

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  1. Hrenowsky

    Thread Starter New Member

    Aug 14, 2011

    First a little sum up of what i want to make.
    I've got a JDM vehicle that has a top speed delimiter at 180km/h.
    This is regulated by the speed sensor, which has a square freq pulse (see attached images).

    Now i found and built a circuit which divides the frequency sent from the sensor to the ecm by 2, but there is a problem, because the voltage on the output drops to 6V, this causes the ecm to register a fault (and turn on the mil warning light). I've attached a simulation of the circuit in multisim for reference.

    I've looked everywhere but did't find a solution, so any help would be greatly appreciated :)

    There is one thing else, i've heard of a circuit that sends realtime signals from the sensor to the ecm until it reads 170km/h then it just keeps sending the 170kmh signal regardless of the sensor reading, so the car can reach it's actual top speed. I've searched for this circuit, but have no idea what it's called or how to make it...

    Sensor at 10km/h

    Sensor at 50km/h

    Sensor at 100km/h

    Sensor at 170km/h

    Circuit sim

    Uploaded with
  2. bertus


    Apr 5, 2008

    I am closing this thread as it violates AAC policy and/or safety issues.

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