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Chapter: Control Systems - Systems and their Representation

Open loop and Closed loop systems

The open-loop system is also called the non-feedback system. This is the simpler of the two systems.

1. Open-loop systems:

 

The open-loop system is also called the non-feedback system. This is the simpler of the two systems. A simple example is illustrated by the speed control of an automobile as shown in Figure 1-2. In this open-loop system, there is no way to ensure the actual speed is close to the desired speed automatically. The actual speed might be way off the desired speed because of the wind speed and/or road conditions, such as uphill or downhill etc.



2. Closed-loop systems:

 

The closed-loop system is also called the feedback system. A simple closed-system is shown in Figure 1-3. It has a mechanism to ensure the actual speed is close to the desired speed automatically.

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Control Systems - Systems and their Representation : Open loop and Closed loop systems |


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