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考虑运行工况的纯电动汽车动力传动系统参数设计
秦大同, 王禺寒, 胡明辉
重庆大学 机械传动国家重点实验室, 重庆 400044
摘要:
针对传统理论计算方法的不足,提出了一种理论计算与运行循环工况分析相结合的纯电动汽车动力传动系统的参数设计方法。根据整车动力性需求确定了电机的峰值功率。为使运行工况下电机尽可能工作在高效区,选取10种循环工况对整车需求功率范围进行分析,由此确定了电机的额定功率。分析了电池质量对整车动力性和续驶里程的影响,通过定义加速时间影响因子和续驶里程影响因子,修正了电机的功率参数。以整车动力性为约束,以等速工况下的续驶里程最大为目标对传动系速比进行优化,使整车的续驶里程在满足动力性的条件下明显提高。分析了蓄电池在不同SOC下输出功率的变化规律,当蓄电池SOC接近下限时,对电池组的输出功率进行了仿真分析,结果表明在极限工况下,蓄电池的输出功率可以满足整车的动力性要求。
关键词:  电动汽车  驱动电机  电池  速比  优化
DOI:10.11835/j.issn.1000-582X.2014.01.002
分类号:
基金项目:国家863高技术项目(2008AA11A145);重庆市自然科学基金重点项目(CSTC,2011BA3019)
Powertrain parameter design for the electric vehicle considering driving cycle
QIN Datong, WANG Yuhan, HU Minghui
The State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China
Abstract:
In allusion to the defects of traditional theory matching method, the authors propose a new power matching method which combines theoretic calculation and cycle working condition together for powertrain of pure electric automobiles. Based on dynamic constraint, the peak power of motor is determined. In order to make the motor work in high efficiency area, the power needed by vehicles in ten cycles is analyzed and the motor rated power is determined. Regular effect pattern of battery parameters on dynamic property and driving range of entire vehicle is analyzed. With defining a conception of acceleration time influence factor and continue driving range influence factor, motor parameters are amended. The transmission ratio is optimized with taking the power of the entire vehicle as constraint and the maximum driving range in constant speed condition as object, and the driving range is greatly improved. The output power of battery in different SOCs is simulated, and it’s found that when the SOC closes to lower limit, the output power of battery is able to satisfy the demand of the vehicle.
Key words:  electric vehicles  drive motor  battery  speed ratio  optimization
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