Simulink Transmission Shift Map

Hello,

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?

Answer 1

[Fangjun Jiang]

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]

Could you explain the values in the lookup table? Specififcally how to obtain those values? Thank you.

[Fangjun Jiang]

The values for the lookup table are provided in the Original Poster's question.