Abstract:

A cooperative control method was proposed for the compound braking and the active suspension of pure electric vehicles (EV) with control objectives of both energy recovery performances and braking safety to improve the comprehensive performances of EV chassis. Completed some longitudinal mechanical
characteristics tests for tires; established a tire longitudinal mechanical model and a vehicle dynamics model; designed a fuzzy cooperative control strategy. Verified the performances of the cooperative control by the joint simulation of the soft-wear Carsim and Simulink. The results show that the coordinated control increases the braking recovery energy by 13.11%, the battery state of charge (SOC) by 9.96%, and the comprehensive quadratic performance index of suspension by 8.61% when braking slightly on the road with low adhesion coefficient; and decreases the brake distance by 9.08%, and the comprehensive quadratic performance index of suspension by 5.93% when emergency braking on the road with high adhesion coefficient. Therefore, this control
strategy improves the compound braking performances with less decreasing the suspension performance

Key words: pure electric vehicle, active suspension, compound braking, cooperative control, fuzzy control