triggering a pulse signal

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Tommaso Colamartino 2021-5-1

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编辑： Tommaso Colamartino 2021-5-6

Goodmorning to all,

I would like to create a simulink model where a boolean true triggers a pulse signal that lasts a precise n. of periods, even if in the meanwhile the trigger goes off. Does anyone know how to do it?

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Nagasai Bharat 2021-5-4

Hi,

Do you mean a single pules with period "n" or n pulses of a particular period are to be generated when the boolean goes true?

Tommaso Colamartino 2021-5-5

编辑：Tommaso Colamartino 2021-5-5

@Nagasai Bharat sorry, I realized now it wasn't so clear.

I've got this true signal of 10ms that can arrive whenever it wants, it could income at simulation time > 0, it depends on an other subsystem; when it arrives, after it switches again from T to F (i.e. 10ms) i want n pulses with given freq exiting my subsys.

I tried with enable subsys but it doesn't seem to work. Any idea?

thanks!

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Answer 1

Nagasai Bharat 2021-5-5

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https://ww2.mathworks.cn/matlabcentral/answers/818805-triggering-a-pulse-signal#answer_692575

finitePulses.slx

Hi,

I have tried a logic with both enable and triggered subsystems and it seems to work for your use case.

I have attached the Simulink file.

Here in the Triggered subsystem I am trying to get the point when your true signal comes and then this would be passed into the Enabled subsystem where a Counter (Counts the rising edges of the pulse passed to it) is implement with a Switch Block to discards the pulses greater than the number specified.

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Tommaso Colamartino 2021-5-5

编辑：Tommaso Colamartino 2021-5-6

@Nagasai Bharat Nice! I don't know why the enabled subsys didn't work for me. Did you change something in the solver?

There is only one problem: if my triggering signal comes at an instant different form a multiple of the period of the pulse generator, I will have the first pulse with a period different from the others. To understand what I'm saying, try to change in the model you sent the step time of the step input with a non-integer number.

is there any possibility to put the pulse inside the enabled subsystem so that it starts when the subsystem is enabled?

Thanks a lot!

UPDATE: I was able to put the pulse gen inside the enabled sys. but it starts counting when the simulation begins, so it doesn't seem to be the solution

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