The full name of a PI controller is
Proportional-Integral Controller.
- Proportional (P): This part of the controller adjusts the output based on the current error. The greater the error, the bigger the correction.
- Integral (I): This part deals with the accumulation of past errors over time, correcting any long-term bias that might exist in the system.
Together, they help maintain a system at a desired setpoint by adjusting the control output based on both the current error and the accumulated error over time.