input 2 expects a value in range [-0.5 0.3], but has a value of 0.442213.

I am trying to control half car model with fuzzy logic controller. no matter what I do with the input and output values, I get the same error. I wonder if I'm making a mistake in the simulink.

[Sanju]

Can you please share your model for better understanding and reproduction of the issue.

Answer 1

[Sanju]

Hi Mücahit,

To fix the error "input expects value in range", you can try out the following steps,

• Normalize the dataset by dividing each input by its maximum value to ensure uniform scaling.
• Ignore errors by turning off warnings or changing error settings in the fuzzy logic controller block in Simulink by setting it to "none".
• Manually adjust the upper and lower bounds for input and output membership functions to accommodate for the error.
• Increase input range values of the fuzzy inference system (FIS).
• Employ an additional set of fuzzy rules that consider error derivatives for better control over the fuzzy logic-based controller outputs. Note that this approach requires extra setup work and computation time..
• Define fuzzy input membership functions capable of handling values outside the specified range to ensure the controller can handle a wider range of input values.

For further assistance please share your model.

You can also refer to the below documentation links for more information,

https://www.mathworks.com/help/matlab/ref/double.normalize.html

Hope this helps!