PI controller
In control engineering, a PI Controller (proportional-integral controller) is a feedback controller which drives the plant to be controlled with a weighted sum of the error (difference between the output and desired set-point) and the integral of that value. It is a special case of the common PID controller in which the derivative (D) of the error is not used.
 | This engineering-related article is a stub. You can help Wikipedia by expanding it. |
Controller output = Constant KI x Summation (Error x Time)