Dynamic Torque Distribution - DDV in electric vehicles

  Dynamic Torque Distribution Copyright: IEM

In the automobile 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 in 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 tire instead of brake. To implement the DDV application 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 vehicle the appropriate drive torques can be regulated flexibly by separate control of both motors.