Efficiency map of a car running through the WLTP cycle

Hello guys,

I'm trying to simulate a heatmap for the efficiency of an electric car's powertrain. I have already visualized the functional points of the WLTP, i.e. the torque required at the wheel, as you can see.

I've already identified the loss mechanisms, and I can calculate the losses for each point (here in this photo). My problem is, how can I visualize the efficiency here? Like a heatmap + constant contours

thank you in advance

Answer 1

[Umar]

Hi @Mansour,

You mentioned, “ I've already identified the loss mechanisms, and I can calculate the losses for each point (here in this photo). My problem is, how can I visualize the efficiency here? Like a heatmap + constant contours ”

So, to address your comments, I would visualize the efficiency of an electric car's powertrain as a heatmap with constant contours, you can utilize MATLAB's contourf function for filled contour plots and colorbar for indicating efficiency levels. Below is a code snippet that demonstrates how to create such a heatmap based on your torque and loss calculations.

   % Sample data for torque and efficiency
   torque = linspace(0, 300, 100); % Torque values from 0 to 300 Nm
   speed = linspace(0, 150, 100);   % Speed values from 0 to 150 km/h
   [Torque, Speed] = meshgrid(torque, speed);

   % Example efficiency calculation (replace with your actual efficiency function)
   Efficiency = 1 - (Torque.^2 + Speed.^2) / (300^2 + 150^2); 

   % Create the heatmap
   figure;
   contourf(Torque, Speed, Efficiency, 20); % 20 contour levels
   colorbar; % Display color scale
   xlabel('Torque (Nm)');
   ylabel('Speed (km/h)');
   title('Efficiency Heatmap of Electric Car Powertrain');

Please see attached.

So, in above example code provided, replace the efficiency calculation with your specific formula based on the loss mechanisms you have identified. The contourf function will generate a filled contour plot, effectively visualizing the efficiency across different torque and speed combinations. Adjust the number of contour levels as needed to enhance clarity.

Note: please bear in mind that I only have access to Matlab mobile.

Hope this helps.