Adaptive regenerative braking control in severe cornering for guaranteeing the vehicle stability of fuel cell hybrid electric vehicle

Abstract

Front-wheel-drive electric vehicle has only 1 electric motor which is connected to the front drive axle. With this system constraint, regenerative braking by using an electric motor can be only applied on front wheels symmetrically. Additional mechanical friction braking can be independently applied on each of all wheels using brake by wire such as EMB (Electro-Mechanical Brake). During severe cornering with braking, excessive regenerative braking force distribution to the front axle for improving the fuel economy can cause the vehicle to approach its handling limit, i.e., if the front tires saturate first, the vehicle may plow out of the curve and is called to limit understeer. When the vehicle comes in a danger of crossing the limit, adaptive regenerative braking controller engages, assisting the driver to guarantee the vehicle stability. Controller can distribute an optimal regenerative brake torque and additional mechanical friction brake torques in order to prevent loss of control for the vehicle. Carsim™ software is used to verify the effectiveness of the proposed controller.