motorcycle rev limiter

Discussion in 'The Projects Forum' started by yougarage, Mar 4, 2011.

  1. yougarage

    Thread Starter New Member

    Nov 29, 2010
    Hello! I'm new in electronics and I'm working on this project, a rpm limiter for my motorcycle.
    I need to "cut" the injectors common positive supply so I designed this simple circuit. It is in normally closed configuration because if the microcontroller fails the engine won't stop.
    the supply can range from 6v to 26 v because I want to power the board from another power supply, but the ground is shared.
    I also arranged a flyback diode to protect the mosfet against the spikes coming back from the injectors.
    Do you think this could work? I don't know what value could be good for r1 and r2.
    the mosfet is a pnp FQPF17P06
    Forgive me for the sloppy scheme...