控制系统是一个系统，其中系统的行为由微分方程决定。它使用控制回路管理设备和系统。有开环控制系统和闭环控制系统。
开环控制系统用于不需要反馈和错误处理的应用中。它简单且经济，但无法优化。 OPCS 的维护更容易。
闭环控制系统用于需要反馈和错误处理的应用中。这是一个复杂的系统，不经济，但可以优化。 CLCS 的维护很困难。
下表区分开环控制系统和闭环控制系统：
| S.No. | Open-Loop Control System | Closed-Loop Control System | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | It easier to build. | It is difficult to build. | |||||||||||||||||||||
| 2. | It can perform better if the caliberation is properly done. | It can perform better because of the feedback. | 3. | It is more stable. | It is comparatively less stable. | 4. | Optimization for desired output can not be performed. | Optimization can be done very easiy. | 5. | It does not consists of feedback mechanism. | Feedback mechanism is present. | 6. | It requires less maintenance. | Maintenance is difficult. | 7. | It is less reliable. | It is more reliable. | 8. | It is comparatively slower. | It is faster. | 9. | It can be easily installed and is economical. | Complicated installation is required and is expensive. |