How can I evaluate the next state to take a decsion in Simulink?

Keeping the complicated details aside, what I want to do is this: I want to take a decision in Simulink (Choose between two controllers) based on what the next state will be using one of these controllers (the main one). If the next state meets a certain criteria then I will make a switch to the other controller. I've been trying to think of how this can be implemented but I just can't think of a way.

Answer 1

[Jim Riggs]

Here is my thought:

This used duplicate controller blocks.

Or if the decision only depends on the first controller:

Or maybe this would work:

[Yaseen Abdel Moneim Sabry El-Zawahry]

Yes, this is what would come to mind at first. But the problem is that the switch logic is dependent on what would happen should we choose controller #1. So the switch logic is actually dependent on the system and the system is dependent on the switch so it can't be directly solved that way.

Answer 2

[Yaseen Abdel Moneim Sabry El-Zawahry]

After some time thinking and trying solutions I came up with one that works well enough for my application. What I did is that I created a similar system to the one I'm controlling. This new system gets updated with new initial values periodically (every 0.01s in my case) and is always controlled by the controller #1. Then the output of this system is calculated and based on this output we can do the necessary logic to choose the controller for the true system.