Discrete to continuous in Simulink.

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Nguyen Hieu 2022-8-25

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评论： Paul 2022-8-29

Hi, I use PID controller to control the input voltage (Ui) of the servo valve to adjust the spool displacement [-10< Ui <10 (V)].

I coded Ui =[-10:0.01:10]; and Simulink show the error: "Encountered unknown exception". So i think that discrete value from Ui can't calculate for the continuous system ( have PID controller and Intergator). It has any block or code to make Ui become continuous? Thank you for help.

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Nguyen Hieu 2022-8-29

Math equation is:

@Paul

Paul 2022-8-29

Apparently Ui is supposed to be scalar, but its coded as a 2001-element vector. Why is it coded as a vector?

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回答（1 个）

Abderrahim. B 2022-8-25

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Hi!

Use d2c and/or c2d functions in a MATLAB function !

Check out the link below, some others methods to do this conversion are listed there.

Link: Continuous-Discrete Conversion Methods

Note that most of these methods require Control System Toolbox.

Hope this helps

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Nguyen Hieu 2022-8-29

My code is:

U =[-10:0.1:10];

Ui=d2c(U);

And Matlab show:

Error using d2c (line 33)

Not enough input arguments.

Error in half_car_supension (line 16)

Ui=d2c(U);

Can you help for this. Thank you.

Abderrahim. B 2022-8-29

d2c and c2d accept model object as input, will not work in your case. To convert a vector(discrete) to continuous use quantizer and zero-order hold blocks.

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