MPC cannot be designed in app

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Dhruv Thakkar
Dhruv Thakkar 2020-3-17
评论： JGP 2024-3-20
I have a Carsim S-functon as the plant model for a MPC. But I get an error saying "Plant model cannot be a pure direct feed-through system without additional dynamics". Why does it keep saying that?
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Kumar Prabhakar
Kumar Prabhakar 2021-5-29
SIR HAVE YOU SOLVED THE SAME PROBLEM
TELL ME HOW
zhanglong zhang
zhanglong zhang 2021-6-11
hello, i also have the problem,may you tell me how can i solve it? thank you.

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回答（3 个）

Junhao Jiang
Junhao Jiang 2020-4-22
The compatibility between CarSim and Simulink is not high,if you have the state space,you should use it,or you only choose the s-function to make it.
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Pacifique Turabimana
Pacifique Turabimana 2021-12-27
How can I add CarSim S-Function in Simulink Library?
I tried to link CarSim with Simulink but nothing to do after because I can't find CarSim in Simulink library, I tried even online MATLAB but I can't be ab;e to continue working on my research. Please guide me to solve it.
Walter Roberson
Walter Roberson 2021-12-27
Unfortunately carsim.com does not appear to post their installation documentation online :(

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Walter Roberson
Walter Roberson 2021-6-11
According to https://www.mathworks.com/matlabcentral/answers/473358-mpc-controller-direct-feedthrough-from-manipulated-variables-to-any-output-in-plant-is-not-allowed#comment_961921 you currently have an output that is being calcuated from an input signal with no modeled delay, but MPC does not permit that. You need to configure your model to take some time between input and output for all signals.
You can use delay blocks, or you can use a transfer function.
https://www.mathworks.com/help/control/ug/time-delays-in-linear-systems.html
https://www.mathworks.com/matlabcentral/answers/42300-how-can-i-implement-time-delay-transfer-functions-in-simulink-250-e-s-20-s-1-s-10
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MUHAMMAD
MUHAMMAD 2023-12-8
Solution:
I had same problem and It is solve by adding time delay.
You can add time delay in between MV and plant. I did using matlab command like like
plant = tf([num],[den],'OutputDelay',1.5 )
I hope this answer helped you.
Example
%%Transfer Function By System identification
num = [-1.324 6.6e05 -6.914e09 5.128e13 -1.054e19]
den = [1 1.99e04 1.371e09 1.145e13 4.037e17]
plant = tf([num],[den],'OutputDelay',1.5 )
JGP
JGP 2024-3-20
can you help me? Even if I use the delay or LTI system, the error continues.
How do I insert the Matlab code you mentioned into Simulink?

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MUHAMMAD
MUHAMMAD 2023-12-8
Solution:
I had same problem and It is solve by adding time delay.
You can add time delay in between MV and plant. I did using matlab command like like
plant = tf([num],[den],'OutputDelay',1.5 )
I hope this answer helped you.
Example
%%Transfer Function By System identification
num = [-1.324 6.6e05 -6.914e09 5.128e13 -1.054e19]
den = [1 1.99e04 1.371e09 1.145e13 4.037e17]
plant = tf([num],[den],'OutputDelay',1.5 )

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