INTRODUCTION
All the foundations that we have laid in the preceding chapters led to the goal of the design of the control system. Starting with a controlled process such as that shown by the block diagram in the figure below, control system design involves the following steps:
- Determine what the system should do and how to do it
- Determine the controller or compensator configuration, relative to how it is connected to the controlled process.
- Determine the parameter values of the controller to achieve the design goals
CONTROLLERS
A closed-loop control system tries to achieve the target output because of the feedback signal. Many times, the output response achieved is not smooth and may have a steady error. Thus, the transient and steady response can be improved by using a control action of transfer function GC(s).
Difference between controllers and compensators: Controllers are used at design time to control the output or to improve the response of the system whereas compensators are used to improve the response of the system when the system output gets deviated from the desired output after long use.
Types of controllers:
- Proportional Controller
- Derivative Controller
- Integral Controller
- Proportional + Derivative (PD) Controller
- Proportional + Integral (PI) Controller
- Proportional + Derivative + Integral (PID) Controller
Proportional Controller
PROPORTIONAL + DERIVATIVE (PD) CONTROLLER
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