全球能源危机与环境问题正变得日益严峻，新能源汽车发展因而受到高度重视，世界各国纷纷出台政策鼓励新能源汽车产业技术发展与商业化普及。过去10年，全球新能源汽车历年产销量都在快速增长，其中中国市场销量占比更是超过了50%。中国的新能源汽车发展主要以纯电动汽车为主，经过多年的探索与实践，电动汽车发展战略已上升为国家战略。随着电动汽车产业化进程的加快，市场保有量不断攀升，其产品综合性能越来越受到广泛的关注和重视。尤其考虑到电动汽车特有的高压电动力系统的重要性以及问题出现后可能导致的严重性后果，如何在研发阶段评价和提高电动汽车动力系统的性能表现就显得尤为重要。本文经过大量的文献分析发现，当前对于电动汽车动力系统评价的研究均存在一定的不足，还未形成一套较为全面的，可用于指导实际研发生产活动的评价体系。因此，论文从电动汽车动力系统角度出发，建立一套具有广泛适用性的动力系统评价体系和模型，并以此指导B公司进行设计方案的选择。本文结合市场需求、行业标准、技术成熟度、政策法规等方面因素，立足于动力系统自身特性，并结合整车性能表现需求，系统地分析和确定了用于评价电动汽车动力系统的各项指标及其相应的评价方法，主要有动力性、经济性、电磁兼容、可靠性、安全性、充电性能、驾驶性、舒适性和成本特性等9个评价指标及各自细分指标。之后通过研究和分析，最终决定运用基于单一模糊数层次分析法构建电动汽车动力系统评价层次模型，并邀请电动汽车行业专家运用专家打分法进行同层级评价指标重要度判定，最终确定了各指标权重值分配，完成了电动汽车评价体系的构建。此外，通过对评价指标选取、研究方法、研究过程、以及研究结果的有效性分析，确认了所建立评价模型的有效性；并成功运用该评价体系和模型指导B公司对动力系统设计方案进行了全面分析和选择，提出了指导性的建议。
The global energy crisis and environmental problems are becoming increasingly serious, so the development of new energy vehicles has been highly valued. Countries around the world have issued policies to encourage the technological development and commercial popularization of new energy vehicle industry. Over the past decade, global production and sales of new energy vehicles have been growing rapidly every year, with Chinese market contributing for more than 50% of sales. The development strategy of new energy vehicles in China is to develop pure electric vehicles firstly, which has been raised as the national strategy. With the acceleration of the industrialization of electric vehicles and the continuous rise of market ownership, the comprehensive performance of electric vehicles has attracted more and more attention. Especially considering the importance of the unique high-voltage electric power system of electric vehicles and the serious consequences that may be caused by system failures, how to evaluate and improve the performance of electric vehicle powertrain system in the research and development stage is particularly important.In this thesis, through analysis by extensively literature review, it is found that there is still a lack of intensive research on the powertrain system evaluation of electric vehicles, and a more comprehensive evaluation system has not been formed, which can be used to guide the actual R & D and production activities. Therefore, from the point of view of electric vehicle powertrain system individually, this thesis will establish a set of widely applicable evaluation system and model for powertrain system and then apply it on the powertrain system design scheme evaluation and choosing of the B Company to make the guidance.Combined with market demand, industry standards, technology maturity, policies and regulations, and based on the characteristics of the powertrain system, also considering the requirements of the whole vehicle, all the indexes used to evaluate the powertrain system of electric vehicles and their corresponding evaluation methods are systematically analyzed and determined. There are nine evaluation indexes included, such as power, economy, electromagnetic compatibility, reliability, safety, charging performance, drivability, comfort and quality cost, and their subdivision indexes. After that, through research and analysis, the FAHP based on the single fuzzy number is finally decided to be chosen to build the hierarchical evaluation model of electric vehicle powertrain system. And then the electric vehicle industry experts are invited to determine the importance of evaluation indicators at the same level by following the expert scoring method. Finally, the distribution of the weight value of each index is determined, and the construction of the evaluation system of electric vehicle is completed. In addition, in this thesis, the effectiveness of the evaluation model is also confirmed by the validity analysis of the selection of evaluation indicators, research methods, research process, and the research results respectively. In the end of the thesis, the established evaluation system and model is successfully applied to guide the B Company to comprehensively analyze and select the powertrain system design scheme.
