How do I create a 2D lookup table from efficiency map?

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bidhan pandey
bidhan pandey 2021-12-4
评论： Chunru 2021-12-9
Hi,
I have created a efficiency plot using [speed,torque] points (see figure). Efficiency inside the red curve is 96% and between the red and the green line, the efficiency is 94%. How do I create a 2D lookup table that gives out efficiency value for a given torque and speed?
Regards,
Bidhan

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回答（1 个）

Chunru
Chunru 2021-12-4
% Combine all the points for red and green curves to form the three vectors
% speed, torque, efficiency. Then use the scatteredUbterpolant
F = scatteredInterpolant(speed, torque, efficiency)
% now you can look up
e = F(speed0, torque0)
% doc scatteredInterpolant
  2 个评论
bidhan pandey
bidhan pandey 2021-12-7
编辑：bidhan pandey 2021-12-7
Thanks for the answer. I did use your answer in a Matlab funtion block in Simulink to get back an efficiency value. But that made my model too slow. Actually I want to create a 2D lookup table (in the 2-D Lookup Table block) that I can use inside Simulink. Any help on that?
Chunru
Chunru 2021-12-9
If you want to improve the speed, one way is to interpolate the data into a 2-D regular grid, for example
[x, y] = meshgrid(0:.1:1, 0:.1:1);
z = F(x, y);
Once these are evaluated offline, you can use a 2D-lookup table in simulink with x, y, z the lookup table.

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