How schould the matlab function be to hold an signal between two values?

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AF 2022-10-7

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评论： AF 2022-10-7

I have a rising signal of a temperature. As long as the value has not reached a limit, e.g. 90%, "0" is to be displayed. If the value is reached, 1 is displayed. After that, the value can drop to e.g. 30% until "0" is output again. This is to achieve that the value remains between the two limits by the output of 0 and 1.

It is about a Simulink model and the code for it should be in a matlab-fct block.

I tried a lot with if-functions but i dont get it.

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Les Beckham 2022-10-7

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编辑：Les Beckham 2022-10-7

在 MATLAB Online 中打开

Perhaps something like this in a MATLAB Function block?

function out = determineStatus(in)
persistent out
if isempty(out)
    out = 0;  % initial output value
end
% implement the hysteresis
if out = 0 && in > 90
    out = 1;
elseif out = 1 && in < 30
    out = 0;
end
end

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Les Beckham 2022-10-7

编辑：Les Beckham 2022-10-7

@Fangjun Jiang

Of course you are right (== instead of =). Thanks for pointing that out. I thought about true/false vs. 1/0 but since OP specifically asked for 0 and 1, I went with that.

Also, good call on the relay block. I knew there was a simpler way to do this with a built-in block but I don't currently have Simulink to browse through the library.

@AF

Then feed B/A into the function and change 90 and 30 to 0.9 and 0.3.

AF 2022-10-7