Efficient Driveline Architecture and Torque Distribution Strategy for Dual Traction Machines Electric Vehicles

Multiple power sources and traction machines are incorporated within hybrid electric vehicles (HEV) to enhance their safety and propulsion power. However, such vehicles suffer from undesired passenger-felt jerks during drivetrain commutations and from large power peaks during power source switchings that reduce vehicle performance and power sources lifetime. To overcome these drawbacks, a novel soft transition strategy is proposed to coordinate the switchings between the different vehicle traction motors. To improve HEV propulsion, a driveline architecture based on fuzzy logic control is used to allocate convenient torque percentages to front and rear vehicle wheels. The obtained simulation results confirm the effectiveness of the developed fuzzy torque distribution strategy and soft transition techniques.