Effect on regenerative braking efficiency with deceleration demand and terrain condition

摘要

Deceleration rate and terrain adhesive coefficient are critical factors, which are drastically diminishing the regenerative energy enhancement in the hybrid electric vehicle. In addition to that, sizing the electric propulsion system also very important to increase the acceleration performance and regenerative braking efficiency. For example, oversizing the electric propulsion system will occupy additional space and increase the weight of the vehicle. On the other hand, down sizing the electric propulsion system will not contribute to achieve the fuel economy of the vehicle, where the effect of the hybridization is negligible. Nevertheless, even for a given hybrid drive train design, the electric propulsion system cannot produce all kind of braking power to stop the vehicle within the expected braking condition. Therefore the involvement of the mechanical braking system is inevitable to ensure the safety braking. This paper addresses the correlation between the regenerative energy, terrain adhesive coefficient and deceleration rate of the vehicle. Here, front wheel drive vehicle is considered for the simulation and a decision making strategy is designed to split and distribute the braking force to front and rear wheels accordingly. Finally a simulation study is conducted to outline the proposed analysis.