Calculating the efficiency of an electric motor from the speed of the vehicle and the slope of the road

Abstract

In this publication, a kinematic procedure is presented, which can be used to determine the efficiency of an electric motor given the speed of the vehicle and the gear ratio set with the gear shifter. The generated look-up table can be used later during Simulink modeling, thus shortening the implementation of the drive chain and speeding up its simulation thanks to the reduced calculation requirements. However, due to the changed circumstances of the use of the efficiency map, instead of the 2 independent variables characteristic of the current state of the engine, 5 independent variables are finally required to directly access the efficiency data, which are the current parameters of the vehicle dynamics.