PID stands for proportional, integral, derivative. (For those of you that took calculus in school 
)
A PID controller uses feedback to try and keep a sensor reading at a certain value.
Examples of PID controllers are the IAC (idle air controller) and also the AFR (air/fuel ratio).
PID controllers will have parameters that can be tuned, like how fast the adjustments should be made, how big the adjustments should be, etc. A badly tuned PID routine will cause undershoot or overshoot, for example in the IAC routines this would cause a hunting idle, or maybe stalling if it doesn't adjust fast enough.
)
A PID controller uses feedback to try and keep a sensor reading at a certain value.
Examples of PID controllers are the IAC (idle air controller) and also the AFR (air/fuel ratio).
PID controllers will have parameters that can be tuned, like how fast the adjustments should be made, how big the adjustments should be, etc. A badly tuned PID routine will cause undershoot or overshoot, for example in the IAC routines this would cause a hunting idle, or maybe stalling if it doesn't adjust fast enough.
== IAC Example ==
In the IAC, you have the sensor (current RPM), the feedback control (IAC valve), and the target RPM.
-- AlexHarford - 30 Jun 2006 Edit | Attach | Print version | History: r1 | Backlinks | Raw View | Raw edit | More topic actions
Topic revision: r1 - 30 Jun 2006 - 23:05:12 - AlexHarford
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