[Scilab-users] PID tuning in Xcos

[Alexandre HERISSE]

Hi,

In your scilab context, you are defining Kp and Ki variables.
In the context of your xcos simulation, you define again Kp and Ki.
This seems to be the root cause of the warnings.

Please find the updated attached scilab script where Kp have been 
replaced by Kp0 and Ki have been replaced by Ki0. Note that the context 
of the xcos simulation is still updated with Kp and Ki.

Could you give me your feedback ?

Thanks.



Le 27/02/2013 12:17, amiege a écrit :
> Hi, I am trying to tune a PID controller in Xcos, very much in the 
> same way as described in http://wiki.scilab.org/Xcos/Examples/PID 
> Optimization of a PID. However, it doesn't seem to work, the output of 
> the model is not changing at all, despite the PID gains being changed 
> (albeit not very much) by the optimization routine. Am I doing 
> anything wrong? Using Scilab 5.4.0. Files are attached below.
>
> Here is the output of the command window:
> -->exec('D:\Work\Mathematical modelling\Scilab\tune_DC_motor_PID.sce', -1)
> Warning the variable Kp do not match any context variable name
> ignoredWarning the variable Ki do not match any context variable name
> ignoredWarning the variable Kp do not match any context variable name
> ignoredWarning the variable Ki do not match any context variable name
> ignoredEvaluation 1 - Kp = 2.000000 Ki = 0.010000 y = 0.218898
> Warning the variable Kp do not match any context variable name
> ignoredWarning the variable Ki do not match any context variable name
> ignoredEvaluation 2 - Kp = 2.001000 Ki = 0.010000 y = 0.218898
> Warning the variable Kp do not match any context variable name
> ignoredWarning the variable Ki do not match any context variable name
> ignoredEvaluation 3 - Kp = 1.999000 Ki = 0.010000 y = 0.218898
> Warning the variable Kp do not match any context variable name
> ignoredWarning the variable Ki do not match any context variable name
> ignoredEvaluation 4 - Kp = 2.002000 Ki = 0.010000 y = 0.218898
> Warning the variable Kp do not match any context variable name
> ignoredWarning the variable Ki do not match any context variable name
> ignoredEvaluation 5 - Kp = 1.998000 Ki = 0.010000 y = 0.218898
> Warning the variable Kp do not match any context variable name
> ignoredWarning the variable Ki do not match any context variable name
> ignoredEvaluation 6 - Kp = 2.000000 Ki = 0.011000 y = 0.218898
> Warning the variable Kp do not match any context variable name
> ignoredWarning the variable Ki do not match any context variable name
> ignoredEvaluation 7 - Kp = 2.000000 Ki = 0.009000 y = 0.218898
> Warning the variable Kp do not match any context variable name
> ignoredWarning the variable Ki do not match any context variable name
> ignoredEvaluation 8 - Kp = 2.000000 Ki = 0.012000 y = 0.218898
> Warning the variable Kp do not match any context variable name
> ignoredWarning the variable Ki do not match any context variable name
> ignoredEvaluation 9 - Kp = 2.000000 Ki = 0.008000 y = 0.218898
> Warning the variable Kp do not match any context variable name
> ignoredWarning the variable Ki do not match any context variable name
> ignoredEvaluation 10 - Kp = 2.000000 Ki = 0.010000 y = 0.218898
> Warning the variable Kp do not match any context variable name
> ignoredWarning the variable Ki do not match any context variable name
> ignoredEvaluation 11 - Kp = 2.001000 Ki = 0.010000 y = 0.218898
> Warning the variable Kp do not match any context variable name
> ignoredWarning the variable Ki do not match any context variable name
> ignoredEvaluation 12 - Kp = 1.999000 Ki = 0.010000 y = 0.218898
> Warning the variable Kp do not match any context variable name
> ignoredWarning the variable Ki do not match any context variable name
> ignoredEvaluation 13 - Kp = 2.002000 Ki = 0.010000 y = 0.218898
> Warning the variable Kp do not match any context variable name
> ignoredWarning the variable Ki do not match any context variable name
> ignoredEvaluation 14 - Kp = 1.998000 Ki = 0.010000 y = 0.218898
> Warning the variable Kp do not match any context variable name
> ignoredWarning the variable Ki do not match any context variable name
> ignoredEvaluation 15 - Kp = 2.000000 Ki = 0.011000 y = 0.218898
> Warning the variable Kp do not match any context variable name
> ignoredWarning the variable Ki do not match any context variable name
> ignoredEvaluation 16 - Kp = 2.000000 Ki = 0.009000 y = 0.218898
> Warning the variable Kp do not match any context variable name
> ignoredWarning the variable Ki do not match any context variable name
> ignoredEvaluation 17 - Kp = 2.000000 Ki = 0.012000 y = 0.218898
> Warning the variable Kp do not match any context variable name
> ignoredWarning the variable Ki do not match any context variable name
> ignoredEvaluation 18 - Kp = 2.000000 Ki = 0.008000 y = 0.218898
> Warning the variable Kp do not match any context variable name
> ignoredWarning the variable Ki do not match any context variable name
> ignored
> Thanks in advance,
>
> Arnaud
>
> DC_motor_test.zcos 
> <http://mailinglists.scilab.org/file/n4026069/DC_motor_test.zcos>
> tune_DC_motor_PID.sce 
> <http://mailinglists.scilab.org/file/n4026069/tune_DC_motor_PID.sce>
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-- 
Alexandre HERISSE
Xcos developer
-----------------------------------------------------------
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