Does a DI Controller Improve Recovery Time Compared to No Controller?

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SUMMARY

The discussion centers on the effectiveness of a Differential Integral (DI) controller in improving recovery time compared to a system without any controller. Participants express skepticism about the DI controller's ability to enhance performance, noting that errors remain unchanged regardless of its implementation. The consensus leans towards favoring Proportional Integral (PI) controllers over DI controllers, suggesting that the "D" component may complicate control without providing significant benefits.

PREREQUISITES
  • Understanding of control systems, specifically first and second order systems.
  • Familiarity with PID (Proportional, Integral, Derivative) control theory.
  • Knowledge of the differences between DI and PI controllers.
  • Experience with implementing controllers in software or hardware systems.
NEXT STEPS
  • Research the fundamentals of PID control and its applications in various systems.
  • Learn about the advantages and disadvantages of using DI versus PI controllers.
  • Explore case studies on controller performance in different control loop scenarios.
  • Investigate methods for optimizing recovery time in control systems.
USEFUL FOR

Control engineers, system designers, and anyone involved in optimizing control systems for improved performance and recovery time.

Sam Groves
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If we use a DI controller the error doesnt get better.Regarding the error it is the same as we didnt have any controller at all.But does the DI controller improve the recovery time or not to not having any controller at all?
 
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Hi,

Can you please read your post and agree that telepathy is required to make sense of it ?
Do present us with a complete case instead of leaving us guessing ...
Thanks !

##\ ##
 
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Sam Groves said:
If we use a DI controller the error doesnt get better.
Maybe you have forgotten the P of PID.
In your case, being proportional may be important because there is an I or D, inherent in the control loop.
The right answer will be obvious, once you know the right question.

“The only interesting answers are those which destroy the question”. —Susan Sontag
 
BvU said:
Hi,

Can you please read your post and agree that telepathy is required to make sense of it ?
Do present us with a complete case instead of leaving us guessing ...
Thanks !

##\ ##
What do you mean?
 
Sam Groves said:
What do you mean?
What are you trying to control ?
 
BvU said:
Hi,

Can you please read your post and agree that telepathy is required to make sense of it ?
Do present us with a complete case instead of leaving us guessing ...
Thanks !

##\ ##
What do you mean
Baluncore said:
What are you trying to control ?
A 1st order ot a 2nd order system.
 
Given the great specificity of your posts, I'm confident that the answer is something, something, something.
 
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Sam Groves said:
A 1st order ot a 2nd order system.
This is like extracting teeth.
OK. Let's start at the beginning.
Was your failed attempt at a DI controller, implemented in software, in analogue electronics, or in something completely different ?

Later, we may ask, how you selected the time constants, or on what make and model hardware the controller runs. But let's not get ahead of ourselves, or we will not have all of January to think about it.
 
Sam Groves said:
If we use a DI controller the error doesnt get better.Regarding the error it is the same as we didnt have any controller at all.But does the DI controller improve the recovery time or not to not having any controller at all?
Please provide more information. Currently no one has any idea what you're asking. Imagine we don't know what a DI controller is or what you're doing with it.
 
  • #10
This is the sort of subject where if you can't ask a question that experts can understand, you won't understand the answer.

Having said that, my general advice is to ditch the "D" part ASAP. It will just confuse you, and it's likely you don't need it anyway.
 
  • #11
DaveE said:
This is the sort of subject where if you can't ask a question that experts can understand, you won't understand the answer.

Having said that, my general advice is to ditch the "D" part ASAP. It will just confuse you, and it's likely you don't need it anyway.
Yeah I agree I think PI controllers are the best.
 

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