SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/eng-pid-three-actions

What information do the P, I, and D terms use?

They use present, accumulated, and changing error.

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  1. Present, accumulated, and changing error ✔
  2. Pressure, inertia, and density
  3. Power, impedance, and duty cycle

Why: Proportional action reacts to current error, integral action accumulates error over time, and derivative action responds to its rate of change. Their weighted sum drives the actuator.

Huh, didn't know that: Derivative action can amplify measurement noise, while too much integral action can cause windup.

The dad joke
PID studies the present, remembers the past, and watches the trend.
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References

Answer: Present, accumulated, and changing error. Proportional action reacts to current error, integral action accumulates error over time, and derivative action responds to its rate of change. Their weighted sum drives the actuator.

  1. NI, The PID Controller and Theory Explained www.ni.com/en/shop/labview/pid-theory-explained.html
    proportional control, which reacts to current error; integral control, which addresses accumulated past errors; and derivative control, which predicts future errors
    Checked 2026-10-10.

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