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

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Discussion Overview

The discussion centers around the effectiveness of a Differential-Integral (DI) controller in improving recovery time compared to not using any controller. Participants explore the implications of using such a controller, including its impact on error correction and system dynamics, while seeking clarification on the specifics of the control system in question.

Discussion Character

  • Debate/contested
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • Some participants assert that using a DI controller does not improve error correction, suggesting that the error remains the same as without any controller.
  • There are questions regarding the specific system being controlled, with mentions of first-order and second-order systems, indicating a need for clarity on the context of the discussion.
  • One participant suggests that the proportional component of a PID controller may be significant, implying that the effectiveness of the DI controller could depend on the overall control strategy employed.
  • Several participants express frustration over the lack of clarity in the initial posts, indicating that more detailed information is necessary to provide meaningful responses.
  • There is a suggestion from one participant to consider removing the "D" component of the controller, as it may complicate the control strategy unnecessarily.
  • Another participant expresses a preference for PI controllers, suggesting they may be more effective than DI controllers in certain contexts.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the effectiveness of the DI controller, with multiple competing views regarding its utility and the importance of different components of the control strategy. The discussion remains unresolved, with ongoing requests for clarification and additional information.

Contextual Notes

Participants highlight the need for specific details about the control system being discussed, including the implementation context and the nature of the system (first-order vs. second-order). There are indications that assumptions about the DI controller's function and effectiveness may vary among participants.

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.
 
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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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