Long Downhill Braking and Energy Recovery of Pure Electric Commercial Vehicles
In the above studies, there is a lack of research for rear-axle drive, continuous braking by electric motors and between friction braking. Most of the traditional commercial vehicles need to be equipped with retarders to provide auxiliary braking and absorb part of the kinetic energy of the vehicle when traveling downhill. In contrast, pure electric commercial vehicles are themselves driven by electric motors, which directly provide auxiliary braking to avoid the need for retarders that can reduce the vehicle’s own mass and recover braking energy. While the electric motor acts as an auxiliary braking device, the friction braking force of the front and rear axles of the vehicle is distributed in a variable ratio to make it close to the ideal braking force distribution curve, which can improve the braking efficiency compared with the traditional fixed-ratio distribution method. In this paper, a brake force distribution control strategy based on the rear-axle-drive vehicle is proposed, which divides the long downhill braking into two processes,: firstly, the vehicle decelerates to the long downhill constant driving speed in the shortest possible time, and then the electric motor provides the main braking force, and the friction brake provides the residual braking force, which then controls the vehicle to go downhill at a constant speed.
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