| Open-loop Controller |
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| CATEGORIES ABOUT OPEN-LOOP CONTROLLER | |
| control theory | |
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A characteristic of the open-loop controller is that it does not use Feedback to determine if its input has achieved the desired goal. This means that the system does not observe the output of the processes that it is controlling. Consequently, a true open-loop system can not engage in Machine Learning and can also not correct any errors that it could make. It also may not detect disturbances in the system. For example, a sprinkler system, programmed to turn on at set times could be an example of an open-loop system if it does not measure soil moisture as a feedback. Therefore, even if rain is pouring down on the lawn, the sprinkler system would activate on schedule, wasting water. Open-loop control is useful for well defined systems where the relationship between input and the resultant state can be modeled by a mathematical formula. For example determining the Voltage to be fed to a Motor in order to achieve a desired Velocity would be a good application of open-loop control. An example of an open-loop control system might be a conventional washing machine because, typically, the amount of machine wash time is entirely dependent on the judgement and estimation of the human operator. In the simplest cases, the controller could be an emplifier, mechanical linkages or a filter. In sophisticated cases, it might be an entire mechanical system, such as a microprocessor. An open-loop controller is often used in simple processes because of its simplicity and low-cost, especially in systems where feedback is not critical. To obtain a more accurate or more adaptive control, is a link, or feedback from the output to the input of the system. The system which describes this control is called a Closed-loop System . SEE ALSO REFERENCES Kuo, Benjamin C. (1991). ''Automatic Control Systems'' (6th ed.). New Jersey: Prentice Hall. ISBN 0-13-051046-7. |
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