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How to determine the moment (time) at which the signal exceeded the set value in simulink?

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Marko Boskovic
Marko Boskovic on 15 Feb 2021
Commented: Fangjun Jiang on 16 Feb 2021
If I have a signal defined by exponential function (for example): 2e^t. How do I determine time when the value of this function will be more then (for example) 5?

Answers (2)

Jonas on 15 Feb 2021
Put an integrator block with input 1 inside an enabled subsystem. Use a relational operator to see if your exponential function value is above 5 and use it for the enable port of the enabled subsystem. The output of the integrator will give you the time.

Fangjun Jiang
Fangjun Jiang on 15 Feb 2021
Assume you build your model correctly, your signal varies as time goes. Compare your signal with the Constant value, its output will be a true or false signal. Use this signal to trig a tiggered subsystem, which contains a Clock block inside. Play with it and you should be able to get what you want.
Fangjun Jiang
Fangjun Jiang on 16 Feb 2021
I can see that it can be done using a MATLAB Function block, but no need to use FOR or WHILE loop. Keep in mind that the MATLAB Function block is executed at every simulation step.
Did you try the method I suggested? That is a more straightforward method.

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