MATLAB Answers

Set certain value of signal when it goes above threshold.

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Pawel Rudzki
Pawel Rudzki on 14 Apr 2021 at 12:23
Commented: Fangjun Jiang on 14 Apr 2021 at 17:10
Hello, recently I have been trying to simulate this action in Simulink :
I have a velocity signal, I would like to make it control my valve in Simscape.
When value of velocity goes above set threshold, I want it to create a signal that has specific value and it last for specyfic peroid of time.
I have already tried several methods I have found on internet, but none of them seems working. I also have tried to make it by MATLAb function, but the only thing I have achived are detected peaks of signal.
Do you have any ideas how can I make it

Answers (1)

Fangjun Jiang
Fangjun Jiang on 14 Apr 2021 at 12:47
Use the Relational Operator block to compare the signal against the threshhold value. The output is a true or false signal. Use this signal to trig (either edge or level) or enable an Enabled/Triggered subsystem. Inside the subsystem, provide the desiged signal. Some signal has the ability to specify duration.
Fangjun Jiang
Fangjun Jiang on 14 Apr 2021 at 17:10
Not clear what is the problem based on your comments. Based on your original question, the solution is to let the trigger (the comparison aginst the threshold) determine the timing of the signal, and let your signal source inside the subsystem determine the "duration" of the signal.

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