26 Velocity And Acceleration

The energy required from the propulsion unit depends on the desired acceleration and the road load force that the vehicle has to overcome. Maximum acceleration is limited by the maximum tractive power available and the roadway condition at the time of vehicle operation. Although the road load force is unknown in a real-world roadway, significant insight about the vehicle velocity profile and energy requirement can be obtained through studies of assumed scenarios. Vehicles are typically designed with a certain objective, such as maximum acceleration on a given roadway slope in a typical weather condition. Discussed in the following are two simplified scenarios that will set the stage for designing EVs and HEVs.

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