文章以某前置前驱纯电动汽车为研究对象，根据实车道路滑行阻力曲线，在转鼓上进行常温行驶工况的能量流测试，以及行驶工况结束后常温充电工况的能量流测试。根据能量流测试数据可知，电驱系统、车载充电机、电池包充放电效率处于正常水平，制动能量回收率低，滚阻和风阻损耗占比大。在不改变车辆造型的前提下，提出重点优化轮胎滚阻系数以及标定滑行制动扭矩数据，以提高整车的续航里程。经试验验证，制动能量回收的电量由原来的10.689 kW·h 提高到12.427 kW·h，提升16.3%，续航里程由389 km 提高到410 km，提升5.4%。

This article investigates a front-wheel-drive battery electric vehicle. Using the coast-down resistance curve obtained from on-road tests, energy-flow measurements were conducted on a chassis dynamometer under both a standard ambient driving cycle and the subsequent ambient-temperature charging process. The results indicate that the efficiencies of the electric drivetrain, on-board charger, and battery pack during charge/discharge are within normal ranges, whereas the brake-energy recuperation rate is low and losses due to rolling resistance and aerodynamic drag account for a significant proportion of the total energy expenditure. Without altering the exterior styling, the optimisation effort therefore focused on reducing the tyre rolling-resistance coefficient and recalibrating the coast-down braking-torque map. Experimental validation shows that the recovered brake energy increased from 10.689 kW·h to 12.427 kW·h a gain of 16.3% and the driving range improved from 389 km to 410 km, corresponding to a 5.4 % enhancement.