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Simulink Transmission Shift Map

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MATLAB_Soldier on 28 Sep 2022
Commented: Fangjun Jiang on 11 Nov 2022
I am trying to create a system that would decide if the vehicle needs to shift up or down based on the vehicle speed gradient, the current speed and the following shift map:
I have come up with a simple method that would use a lookup table to decide on the appropriate gear selection. However, I am not sure if this is the best way to go about it. I know that it is possible to do the whole process using StateFlow but unfortunately, it is not available for me. Therefore, I need figure out how to make it work without stateflow.
Is it possible to do it with a lookup table or do you think there is a better way to do it?

Answers (1)

Fangjun Jiang
Fangjun Jiang on 29 Sep 2022
It is possible and you are almost there.
You have the logic to check whether the speed is increasing (for up shipt) or else (for down shift). You only need a 1-D lookup table block with one input, which is the vehicle speed. The vehicle speed threshold would be the index. The gear number would be the output.
You will need two 1-D lookup tables (one for up shift and one for down shift). Use a Switch block to switch the output. Or Use a Merge block (which is more efficient but requires Enabled sub-system).
Beau Tucker
Beau Tucker on 11 Nov 2022
Could you explain the values in the lookup table? Specififcally how to obtain those values? Thank you.
Fangjun Jiang
Fangjun Jiang on 11 Nov 2022
The values for the lookup table are provided in the Original Poster's question.

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