Multi objective analysis on a driving simulator applied to an electric vehicle: vehicle stability, handling and drivability

摘要

The design of electric vehicle has brought new challenges for the driving dynamics and drivability domains. The high torque dynamics of electric motors lead to particular problems such as motor oscillation in the transmission, torque splitting between the standard hydraulic braking system and the regenerative brake, stability problem in case of slippery roads ... After having analysed the drivability aspects, a more complete vehicle model including the lateral dynamics has been built from the drivability model. Some adaptations have been made to make the model running in an RTX environment fulfilling real time as well extra requirements linked to the driving simulator ULTIMATE. The control logic of the regenerative brake has been integrated to the vehicle model. Tip out in curves on packed snow road has been analysed to highlight the contribution of the regenerative brake on the vehicle behaviour. Combining drivability, vehicle stability and handling leads to a kind of multi objective evaluation using a driving simulator and real drivers. This perfectly matches the two principal objectives of the RENAULT Technical Centre for Simulation: (1) developing almost 100% numerical process for vehicle dynamics, (2) performing driving simulations in the early stage of vehicle projects for engineering applications and driver perception or behaviour.