What is the role of Integral in pid control?
Answers were Sorted based on User's Feedback
Answer / pretheesh k k
the role of integral is to reduce the offset .....
| Is This Answer Correct ? | 31 Yes | 1 No |
Answer / kanna
I hope that it is introduce to eliminate the offset.
| Is This Answer Correct ? | 10 Yes | 2 No |
Answer / www.islamqa.com
Actually we can make it simple:
# P:
it's a controller gain which modify the controller o/p
proportional to the error.
# I:
it's a controller gain which modify the controller o/p
proportional to the integral of the error.
# D:
it's a controller gain which modify the controller o/p
proportional to error rate of change.
We have 4 parameters in our control loop to focus on:
1 - the rise time: the period of time during which the pv
get 90% of the desired sp value
2 - max overshoot
3 - settling time: the period of time during which the pv
get the desired sp value and saturate.
4 - error/offset
we can get it clear from this pic:
http://controls.ame.nd.edu/ame437/S2003/hw1/specifications.j
pg
Now we will take a look about the effect of each controller
gain on these parameters:
# P gain:
decrease rise time
increase max.overshoot
increase settling time
decrease error (but not eliminate)
# I gain:
decrease rise time
increase max.overshoot
increase settling time
eliminate error.
# D gain:
no effect on rise time
decrease max.overshoot
decrease settling time
decrease error.
the previous is guidelines to be in background while
dealing with PID,but they are not sharp limits.
Regards,
Ahmed Sabry
Control and Instrumentation Engineer
GPC - General Petroleum Company
ahmedsabry.online@gmail.com
CELL.: 00 2 0121367310
| Is This Answer Correct ? | 4 Yes | 1 No |
Answer / richard marks
Integral is used to control towards no offset in the output
signal. This means that it controls towards no error eg.
error = zero. Integral control is normally used to assist
proportional control, PI.
| Is This Answer Correct ? | 1 Yes | 0 No |
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