Abstract：To lower EV energy consumption, the optimal matching of battery pack, driving motor and transmission system parameters of powertrain was carried out based on car design index and city road conditions. The driving cycle of Jinan city was tested with pure electric microbus to contour the ordinary EV running conditions. A 7.5 kW AC asynchronous motor and a 192 V/100 A·h LiFePO4/C battery pack for the powertrain were analyzed by consideration of car design index, battery pack voltage and mass effect on energy consumption. The efficiency characteristics of the driving motor, the battery pack, the matching character were determined by the EV test bench. The matching relationship between the electrical power driving system and the mechanical transmission system was measured by chassis dynamometer and optimized to suit for most EV common driving conditions. The results show that the EV endurance mileage reaches 169 km under 40 km·h-1 by constant speed metering method. Under the basic urban driving cycle， the endurance mileage reaches 160 km with energy consumption of 12.01 kW·h/100 km.
2013, Vol. 34 
