Control Explain the difference between a proportional controller and a bang-bang

Question

Control Explain the difference between a proportional controller and a bang-bang (ON-OFF) controller. Explain how you would tune a PID controller used to control the oil flow rate in an oil refinery. You implemented a PID controller for a Lasik eye surgery laser beam system. The laser responds well, with minimal oscillations; however, it burns the cheek rather than fixes the eye. What gain(s) should be adjusted in the PID controller? Should the gain(s) be increased or decreased? Explain your reasoning.

Explanation / Answer

4. (a) The output of a proportional controller is not just on or off but can be adjusted to any value between 0% and 100% of the power.

The control direction is significant as in the case of on-off. The inverse action alters the output from 100% to 0% as the process increases while heating and while cooling the action goes from 0% to 100%.

When correctly tuned, the controller can regulate its output to match the power required to keep the process stable at the set point, which cannot be achieved by an On-Off controller.

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