Dynamic Torque Distribution (DDV) in Electric Vehicles

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In the automotive industry the driving safety is always one of the most important subjects. It is in particular perilous, during cornering or emergency steering, if the vehicle under- or oversteers. The ESP technology developed by Bosch in 1990s helps the vehicle in such a critical case keep the desired trajectory. However, the drive dynamic is impacted due to braking. In contrast the DDV achieves the same functionality by applying an additional drive force on the tires instead of brake. To implement the DDV in conventional vehicles a special differential device is necessary. By contrast, this device can be replaced in electric vehicles by using two mechanically decoupled electric motors. According to the driver requirements and the current kinematic state of the vehicle, the appropriate drive torques can be regulated flexibly by separate control of both motors.