Code generation problem about discrete PID Block

Question

Saygin 2015-4-20

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https://ww2.mathworks.cn/matlabcentral/answers/210939-code-generation-problem-about-discrete-pid-block

回答： YANBIN ZHAO 2015-7-19

Hello,

I use the discrete PID block in my model. In simulation there's no problem, however when generating code some problems occurs.

Sample time of PID block is 100e-6. I must call the control block to hardware interrupt block (asyncronous) because of code generation. Therefore I change sample time to -1 and Integrator gain to IntegratorGain*SampleTime.

When analyzing generated code, Integrator gain is multiplied by elapsed time ('mode.block_ELAPS_T') variable which is calculated with Timing.clocTick value. I dont want to be added the elapsed time value because i use pid in pwm timer interrupt block (100e-6)

How to prohibit to generate elapsed time variable in c code. Thank you

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Answer 1

Navaneeth Raman 2015-4-21

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https://ww2.mathworks.cn/matlabcentral/answers/210939-code-generation-problem-about-discrete-pid-block#answer_176129

Hello,

The integrator gain would remain a constant and not change with each timestep if you set its gain to be IntegratorGain*SampleTime where I assume SampleTime is a constant. Do you have a model that you can share so that I can take a look at it and figure out what is going on?

Thanks, Navaneeth