Breakdown of How PID Controller Works?
- Comparison: A PID controller starts its operation by comparing the setpoint value and the process variable value, which it get from the sensor devices. Then it generates a error signal which is the difference between setpoint and the process variable value or the actual value.
- Proportional control: Proportional(P) term responses to the error signal and it aims to bring the system closer to the setpoint.
- Integral control: The integral(I) part is responsible for addressing any long term error from evaluating the past errors. And it eliminates steady-state error of a system.
- Derivative control: The derivative(D) term observe the rate of change of error, and try to calculate the next error and according to that it makes the system stable.
- Control signal: After processing error singal through P, I and D term the controller creates a signal and send it to the actuator to do it’s job according to that.
And this loop continues until to get the most desired or the closest value of the process variable of setpoint.
Proportional Integral Derivative Controller in Control System
A proportional Integral Derivative controller also called a PID controller, is a widely used feedback control mechanism in industrial automation. It aims to regulate a process variable by adjusting a manipulated variable based on the error between the set point and the actual process variable.
Table of Content
- What is a Proportional Integral Derivative Controller?
- Mathematical Expression of PID Controller
- Block Diagram of PID controller
- Working of PID controller
- Tuning of PID controller
- Advantages and Disadvantages of PID controller