基于NSGA-Ⅱ多目标优化的Atkinson发动机及整车性能分析  

Performance analysis of Atkinson engine and vehicle based on NSGA-Ⅱ multi-objective optimization

作　　者：刘书婧 李洋洋[1,2] 刘敬平 段雄波 童济[1,2] 解云坤 LIU Shujing;LI Yangyang;LIU Jingping;DUAN Xiongbo;TONG ji;XIE Yunkun(State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha 410082,China;Research Center for Advanced Powertrain Technology,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学汽车车身先进设计制造国家重点试验室,湖南长沙410082 [2]湖南大学先进动力总成技术研究中心,湖南长沙410082

出　　处：《中南大学学报（自然科学版）》2021年第9期3366-3380,共15页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51776061)。

摘　　要：提出一种基于模型的优化方法,并采用遗传算法优化理论,研究阿特金森循环发动机的节油原理。在原Otto循环发动机基础上改变压缩比和进排气气门时刻,引入高压废气再循环(exhaust gasrecirculation,EGR)系统,利用遗传算法优化控制参数,达到提高燃油经济性及降低NO_(x)排放的效果。最后将优化后的发动机模型用于混合动力汽车上,进一步挖掘阿特金森循环发动机的节油潜力。研究结果表明:燃油消耗量改型发动机优化后降低比例最高达11.16%。在串联式混合动力汽车中输出的累积油耗量在新欧洲驾驶循环(new Europeandrivingcycle,NEDC)工况中降低4.58%,累积NO_(x)体积分数则降低73.34%。此外,本文中的模型和数据可用于更改不同的技术或策略来评估和优化能量分配。A model-based optimization method coupling with the genetic algorithm was represented,and the fuel saving principle of the Atkinson cycle engine was studied.Based on the original Otto cycle engine,the compression ratio and the intake and exhaust value timing were changed,and a high-pressure exhaust gas recirculation(EGR)system was introduced.The genetic algorithm was used to optimize the control parameters to improve fuel economy and reduce NO_(x) emissions.Finally,the optimized engine model was applied to hybrid vehicles to further explore the fuel-saving potential of the Atkinson cycle engine.The results show that the fuel consumption reduction rate of the modified engine is as high as 11.16%.The cumulative fuel consumption output in the series hybrid electric reduces by 4.58%in the new European driving cycle(NEDC),while the cumulative NO_(x) volume fraction decreases by 73.34%.Furthermore,the model and these data in this paper can be applied to evaluate and optimize the energy distribution by changing different technologies or strategies in the future.

关 键 词：阿特金森 可变气门正时 废气再循环 燃油消耗 氮氧化物 

分 类 号：TK412[动力工程及工程热物理—动力机械及工程]