7.7. PID Exercises

Question 1

What is the main difference between bang-bang control and PID control?

Solution

Bang-bang control only switches the actuator fully ON or fully OFF based on thresholds, which often causes oscillations.

PID control adjusts the actuator smoothly and continuously, based on proportional, integral, and derivative terms. This allows finer control and less oscillation.

Question 2

When would you use a PID controller instead of a bang-bang controller?

Solution

Solution is locked

Question 3

What problem does the proportional (P) term by itself often cause?

Solution

Solution is locked

Question 4

How does the integral (I) term improve system accuracy?

Solution

Solution is locked

Question 5

How does the derivative (D) term change the system response?

Solution

Solution is locked

Question 6

If a temperature controller overshoots the setpoint and oscillates, which gain should you adjust?

Solution

Solution is locked

Question 7

A system with PID control eventually settles at the setpoint, but it takes a long time to get there. Which gain is likely too small?

Solution

Solution is locked

Question 8

If a controller never reaches the setpoint and always stays below it, which term is missing?

Solution

Solution is locked