A negative input value for integrator gives a positive output

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maarten de Jong 2020-7-25

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评论： Jonas 2020-8-4

I have a simulink continuous integrator block with a lower limit output saturation at zero.

It takes a negative input and produces a positive output.

What am I missing here?

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stozaki 2020-8-4

test1.slx

Hello Maarten,

I thought the following :

N_CH3OH does not become less than "0" because the saturation lower limit setting value is 0.

If you set the saturation lower limit setting value to a negative value, you can obtain a negative value in N_CH3OH.

Regards,

stozaki

Jonas 2020-8-4

@stozaki

The problem is not that N_CH30H does not go lower than zero really, the issue is more why it is RISING although the input is negative. I would expect that with a negative input, the output should just be saturated to zero.

Can you experiment with the saturation value? Does it work without the saturation to zero? What is you saturate to -eps for example?

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