After reading this topic Comparison between Open loop and Closed loop control systems, you will understand the theory and comparison.
Open loop control systems
It is a control system in which the control action independent of the output signal and depends only on its input signal, also the signal flows through the block is unidirectional. It is shown below,
Closed-loop control systems
It is a control system in which the control action dependents on both the output signal and the input signal. It is shown below,
As compared with the open-loop control system, an additional feedback feature in the closed-loop control system results in the relationship between the output and the input.
Comparison between Open loop and Closed loop control systems
| Open loop control system | Closed loop control system |
|---|---|
| 1. Accuracy depends on the calibration of the input | 1. More accurate due to the presence of feedback |
| 2. Intelligent controlling action not possible | 2. Intelligent controlling action |
| 3. Less components required to construct | 3. More components required to construct |
| 4. More stable in operation | 4. Stability depends on system components |
| 5. Operation affected if non-linearity present | 5. Better performance compared to open loop system if non-linearity present |
| 6. Simple to construct | 6. Complicated design |