Fuzzy Logic Controller Block in Simulink Doesn't Show Two Inputs

Hello everyone,

I created a fuzzy logic controller using MATLAB's Fuzzy Logic Designer App. My controller has two input variables and one output. After designing and testing it, I exported it to the workspace as a variable (named fis).

However, when I switch to Simulink and drag in the Fuzzy Logic Controller block from the Fuzzy Logic Toolbox, I try to load my controller by typing the name fis into the block's parameters.

The problem is:

The block only shows one input, even though my fuzzy system was designed with two inputs.

I expected the block to automatically configure for two inputs and one output, based on the .fis structure.

I would appreciate any guidance on:

• Why the block isn't recognizing both inputs
• How to properly load a multi-input .fis file into Simulink
• Whether I need to use a specific block (not the Function Block version)

Thanks in advance for your help!

Answer 1

[Sam Chak]

Hi @ali

If there is more than one input, you need to use the Mux block to combine the input signals into a virtual signal vector, allowing you to feed it into the input port of the Fuzzy Controller block.

Please let me know if this approach works for you.

[ali]

I want to use two constant block for input fuzzy function and determine name to them and export this sketch to another software like amesim...is it OK that you said for my goal

[Sam Chak]

Hi @ali

If the Mux block approach works for you, then you can use two constant blocks for static input to the fuzzy system. Of course, you may also choose any names you wish to assign to the constant blocks.

If you find the solution helpful, please consider clicking 'Accept' ✔ on the answer.

[ali]

Can I use variables for input that change in time

[Sam Chak]

Please provide an update if you have resolved the original issue.

You can, but ensure that the ranges of the input variables are within those defined in the fuzzy system. This is very important.

[ali]

thanks yor anwser is useful