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How can I determine the time t when a specific value y is reached in SIMULINK?

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Hi everyone,
I'm working on a simulation on SIMULINK which outputs me a value y(t).
I now want to know at what time y(t) reaches a specific value y_1.
So I need to determine t(y_1) = t_1 and somehow display it in SIMULINK?
Also I want to used that value t_1 for further calculations.
Is there any block that I can use for that?
Best regards
Enea

Risposta accettata

Timo Dietz
Timo Dietz il 11 Gen 2021
There are multiple ways of doing this. One is to attach the source block "clock" to a triggered subsystem which contains just a connection between in and out. The trigger input is fed by a comparator which checks for y(t) = y_1.
The triggered block now takes over the simulation time input to its output only in case the comparator triggers.
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Enea Baumann
Enea Baumann il 11 Gen 2021
Sorry for that.
I was able to solve it. As you said I put eq1' and eq2 into a enabled subsystem.
The subsystem is enabled as soon as t_1 is reached (calculated by eq1).
The subsystem's input is t_1.
This way, inside the subsystem eq1' is computed feeding its output to eq2 and and t_1 is obtained by eq1.
Thanks for your help!

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