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Thread: LMM-commanded boost

  1. #31
    Lifetime Member killerbee's Avatar
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    I have not had the courage to mess with these. Process controls was a favorite subject, but it was so long ago.

    I do see some serious vane and boost swings under steady state conditions sometimes. I am not sure where to begin, P, I , or D.
    Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
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  2. #32
    Lifetime Member vortecfcar's Avatar
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    Very nice addition!

    Thanks Ross,

    Nick

    Probably one of the most practical/useful excerpts from the article:

    Where the tuning parameters are:

    Proportional gain, Kp
    Larger values typically mean faster response since the larger the error, the larger the proportional term compensation. An excessively large proportional gain will lead to process instability and oscillation.

    Integral gain, Ki
    Larger values imply steady state errors are eliminated more quickly. The trade-off is larger overshoot: any negative error integrated during transient response must be integrated away by positive error before reaching steady state.


    Derivative gain, Kd
    Larger values decrease overshoot, but slow down transient response and may lead to instability due to signal noise amplification in the differentiation of the error.

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