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P only controller/PID - overshoot

  1. Feb 17, 2016 #1
    1. The problem statement, all variables and given/known data
    I am trying to understand the Proportinal controller, used as a cruise controll for a car. I do understand how it works as long as there are no overshoot.

    2. Relevant equations

    3. The attempt at a solution
    The reason why I do not understand overshoot is because the error then gets negative and then the output also gets negative (out=Kp*error). This means negative thrust? You can never give less thrust than 0, so what is actually happening when the error gets negative?
  2. jcsd
  3. Feb 17, 2016 #2


    User Avatar
    Gold Member

    The car will brake.

    The motor will act as a generator, and will charge the battery ( having a "green enery drive" and an electric motor ).
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