整车动力经济性速比匹配优化策略.docVIP

整车动力经济性速比匹配优化策略 　　摘要： 基于PIAnO优化平台，通过试验设计、近似模型和优化设计方法获得传动速比优化方案.根据测试数据对动力燃油经济性仿真模型进行标定以提高其精度.在标定后的模型上进行传动速比的优化设计，获得具有较高动力经济性能的速比匹配方案.新仿真模型的3，4和5挡加速时间和最大爬坡能力与测试数据一致，百公里加速时间的偏差从2.50%提高到0.14%，百公里综合油耗与测试数据相比由16.4%提高到0.6%；在满足所有动力性能设计的要求下，百公里综合油耗从8.450 L下降到8.172 L，下降3.29%；同时，优化时间由原来的1～2周减少到2 d，极大提高产品开发效率. 关键词： 汽车； 油耗； 速比； 模型标定； 试验设计； 近似模型； 灵敏度 中图分类号： U461.2文献标志码： B Abstract： A transmission speed ratio optimization scheme is obtained by design of experiment， approximation model， and optimization design method on platform PIAnO. According to the test data， the simulation model for power fuel economy is calibrated to improve its accuracy. The transmission speed ratio is optimized on the calibrated model and a speed ratio matching scheme with high dynamic economic performance is achieved. The results show that the optimization strategy is very effective for the analysis model calibration and transmission ratio optimization. The acceleration time on 3rd， 4th and 5th gear and maximum climbing capacity of the new model are consistent with the test data， the deviation of acceleration time of 100 km/h improves from 2.5% to 0.14%. Comparing with the test data， the comprehensive fuel consumption per hundred kilometers improves 16.4% from 0.6%. Under all the dynamics design requirements， the comprehensive fuel consumption per hundred kilometers declines from 8.450 L to 8.172 L， which means that the fuel is saved by 3.29%. At the same time， the optimization time is reduced from 1～2 weeks to 2 d， and so the efficiency of the product development is greatly improved. Key words： automobile； fuel consumption； speed ratio； model calibration； design of experiment； approximation model； sensitivity 0引言 整?动力性与经济性优化一直是国内外研究的热点.随着国家节能减排的推进，对降低油耗方面也不断的提出新要求，汽车企业的发展也迎来了更严峻的挑战.发动机性能是决定汽车整车性能的关键因素，同时与传动系统的匹配也密切相关，如果能够快速获得合适的传动匹配方案，将大大推动研发工作.传统的动力传动匹配方法是试验，但是这将大大增加开发费用，同时也将延长研发周期.[12]现在常采用AVLCRUISE软件来对整车动力性、经济性进行仿真分析，这样不仅可以降低开发费用，也可以缩短设计周期.[34]但是，仿真分析中很多参数很难得到准确的数值，影响仿真分析的准确性，基于不准确的模型