Prof. Dr. Bernd-Robert Höhn

Founder ZG Zahnräder und Getriebe

Workshop Day

Thursday, February 13th, 2020

8:00 AM HOW MANY GEARS FOR ELECTRIC DRIVELINES IN CARS

To define the necessary ratio for ic-engines 3 ratios are defined:
Starting-ratio for a given torque at the wheels from an ic-engine characterized with torque and power Highspeed-
ratio for the recommended or given highspeed of a car with the speed of the ic-engine for maximum
power. Overdrive-ratio for reduced fuel consumption by a given be-map of the ic-engine Why this procedure
are not used for electric drivelines in cars? The wellknown procedure should be used for an electric engine
with their efficiency map. The necessary ratios and the spread of such a transmission will be shown in the
presentation. For a given example of a car and an electric-engine with their efficiency map will be explained
how many gears are needed. Furthermore an example of such a gear will be shown.

Check out the incredible speaker line-up to see who will be joining Bernd-Robert.

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