Dynamically changing sample time for discrete time integrator

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Roger
Roger 2011-6-20
Hello, I am programming a dynamic chemical process which has a changing contact time (which changes the dt in the dC/dt equation). I have used a discrete time integrator with a sample time set to the contact time and this works just as I want it to however as I want the flow rate through the process to be variable and this will change the sample time I need to set. *I want to be able to set the sample time to value calculated else where in the model that changes. Does anyone have any advice for things I could try or know that this is impossible so I can stop trying?
Any extra details needed I will provide happily.
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Roger
Roger 2011-6-20
I have found a work around which is if the contact time is A then simply use a continous integrator with feed from equation that has dC/dt = A * x (where x is the original function). This gives me the desired answer I was looking for but I am a little wary of using this technique as I just made it up and am not sure of limitations / consequences. Any pearls of wisdom?

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Guy Rouleau
Guy Rouleau 2011-6-21
Set the sample time of the discrete time integrator to be inherited and place it inside a triggered subsystem. You will need to make a logic to trigger the triggered subsystem at the right time.

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