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ENTC 395

ENTC 395. Lecture 7b. Today. Closed loop control Definitions Response parameters Examples. Closed Loop Control System. A more detailed look at a closed loop control system:. Controller: Definitions. Set point: Signal indicating desired operating point

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ENTC 395

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  1. ENTC 395 Lecture 7b

  2. Today • Closed loop control • Definitions • Response parameters • Examples

  3. Closed Loop Control System A more detailed look at a closed loop control system:

  4. Controller: Definitions Set point: Signal indicating desired operating point Summing block: Creates error signal Amplifier: Converts error signal to a powered command that affects system response Actuator: Shifts response of system, hydraulic cylinder, DC motor,etc. Sensor: Device that converts system output to a feedback signal.

  5. Simple Switching Controller Control systems can be as simple as an automated on/off switching device.

  6. PID Controllers Controller response may be a function of three components of the error signal KP = Proportional gain KI = Integral gain KD = Derivative gain

  7. Parameter Effects The effect of the Ks on a system are summarized below. Actual relations are more complex. Ks are not independent.

  8. Transient System Response When you design a controller you may look for parameters that give you a desired transient system response. • Delay time, td • Rise time, tr • Peak time, tp • Overshoot, Mp • Settling time,ts

  9. Transient definitions • Delay time, td: _____________________________________ _____________________________________ • Rise time, tr: _____________________________________ _____________________________________ • Peak time, tp _____________________________________ _____________________________________ • Overshoot, Mp _____________________________________ _____________________________________ • Settling time, _____________________________________ts _____________________________________

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