How can I trigger an action when a signal exceeds a threshold for a certain time?

Hallo everybody,

I'm implementing a simulink algorithm. I have an amplitude signal over a time. If it exceeds a certain value for more than a certain time I want to trigger another action.

I'll explain with an example. I have a randomly oscillating signal that goes from 0 to 2. If it exceeds, let's say, 1 for a time of 10 seconds continuously I want to trigger an action.

How can I do it?

Thanks

Answer 1

[Sebastian Castro]

Time-based logic like what you described is best suited for Stateflow, if you have access to that.

Your algorithm can enter a state when the signal is first 1, and keep counting until the signal remains 1. If, after 10 seconds, you're still in that same state, trigger the action.

The image below shows how you can create such a state chart.

If you do not have Stateflow, you could use a Resettable Delay block to create a counter... it already looks messier and harder to read. In fact, my screenshot below is very likely to have some bugs in it. I didn't get to test it, but you can feel free to if you're interested in this approach.

Hope this helps!

Answer 2

[Bushra Kaleem]

I have a similar question. exmple: I have an analog input wave, for when the output goes bove particular threshold, I need to generte pulses of certain time period. Can there be a code for this?