What is a disadvantage of open loop?

Cannot tell if the goal was reached

Where is PID used in real life?

Temperature setting, Cruise control

What happens if a high proportional gain is accompanied with a large offset

The system will spin out of control

What happens if the derivative gain is too high

It will take a long time for system to correct for offsets

What does PID stand for

Proportional, Integral, Derivative

The time it takes to reach the desired value

What is a steady-state error?

When there is a difference between the settled and the desired state

The accumulated Error shown by the shaded yellow region in this picture is:

Negative b/c negative region is larger than positive region

When the system goes beyond the desired value

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Control Theory

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Questions 19

Answers

1
Responds to current events
Proportional control
Derivative control
Integral control
PID control
2
What is a disadvantage of open loop?
Open loop is complicated
Open loop is not stable
Cannot tell if the goal was reached
Open loop is harder to maintain
3
Where is PID used in real life?
Temperature setting
TV remote control
Toaster
Cruise control
4
How do you prevent overshoot?
Lower the Kd
Increase the Ki
Lower the Kp
5
What happens if a high proportional gain is accompanied with a large offset
The system will be more accurate
The system will spin out of control
The system will slow down
6
How does close loop adjust input?
Energy
Feedback
Magic
7
What happens if the derivative gain is too high
The system will be underdamped
The system will speed up
It will take a long time for system to correct for offsets
The system will oscillate
8
How do you find error
Actual - Expected
Expected - actual
9
What does feed forward help us do?
Account for past error
Account for physics of system
Accelerates the system
Predict the future of the system
10
Predicts future needs
PID control
Proportional control
Derivative control
Integral control
11
What does PID stand for
Process, Interval, Difference
Proportional, Integral, Derivative
Pattern, Integral, Derivative
12
Compensates for past accumulated Error
Integral control
PID control
Proportional control
Derivative control
13
What happens if you use proportional alone
The system will be overdamped
The system will encounter a steady state error
System spins out of control
Oscillation
14
What effect does increasing Ki have on settling time
Does not have an effect
Increase settling time
Decrease settling time
15
What is rise time?
The time it takes to reach a settled state
The time that the system oscillates
The time where the error is the highest
The time it takes to reach the desired value
16
What is a steady-state error?
When there is a difference between the settled and the desired state
When the system oscillates
When the system spins out of control
17
The accumulated Error shown by the shaded yellow region in this picture is:
Negative, b/c the shaded positive region is not complete.
Positive, b/c all the shaded regions are treated as + Error.
Positive, because the shaded region is last positive.
Negative b/c negative region is larger than positive region
18
What happens to the integral gain if the system is not at the desired place for a long time
No change
Integral gain reduced by a half
Lower integral gain
Higher integral gain
19
What is overshoot?
When the system goes too fast
When the system has too high of an integral gain
When the system goes beyond the desired value

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