Control strategy for electro-mechanical braking based on curves of ECE regulations and ideal braking force

The braking system of electric vehicle with regenerative braking is different from friction braking system of conventional fuel vehicle. Regenerative braking system makes braking stability of electric vehicles change when it recovers braking energy of vehicles. The improvement of braking energy recovery ration was restricted by the braking stability under the precondition of safe braking distance. Aiming at the electro-mechanical hybrid braking system composed of electric braking and conventional friction braking, the calculation models of electric braking force, electric braking torque and battery charging power were established. In view of the motor torque characteristics and battery charging power limit, three kinds of control strategies for electro-mechanical hybrid braking were designed for recovering the maximal braking energy. The baking energy recovery ration, state of charge and driving range in pure electric mode were calculated and analyzed by embedding simulation module into the ADVISOR. The calculation results show that the curves of I and economic commission of europe (ECE) regulations boundary are not ideal curves of braking force distribution; the curve OABCD is more feasible; the braking energy recovery ratio should be reached 59.56% by OABCD; and the state of charge changes very little; it decreases only by 4.29%.The test data indicates that the driving range can be increased by energy callback.