摘要
电控机械式自动变速器(Automated Mechanical Transmission, 简称AMT)在我国具有良好的市场前景,其结构简单、生成继承性好。建立汽车动力性、等速油耗和NEDC循环工况油耗的数学模型,分析AMT的起步换挡过程及相应的离合器数学模型,通过MATLAB/Simulink和Stateflow,对AMT进行动力性和经济性的仿真分析,并在NEDC循环工况下采用车速差和车速差变化率的双参数发动机节气门开度模糊控制,同时制定该循环工况的经济性换挡规律。结果表明:起步时间由最低挡传动比大小决定,传动比越大,起步时间越短,八挡AMT起步时间最短,仅为1.48s,相较于最长起步时间1.61s的六挡AMT缩短了8.1%;加速时间不仅与起步时间有关,还在很大程度与挡位数量、各挡传动比大小和换挡规律息息相关,六挡AMT的百公里加速时间最短,为13.16s,相较于最长时间14.18s的五挡AMT缩短了7.2%;相同情况下,增加挡位数量会改善汽车的燃油经济性,十挡AMT的NEDC循环工况百公里油耗最低,为6.533L·(100km)^(-1),相较于最高百公里油耗6.793L·(100km)^(-1)的五挡AMT缩短了3.8%。
Automated mechanical transmission(AMT)has potential advantages of marketing in China. AMT has simple structure and easiness to manufacture. The math models of vehicle dynamic performance,fuel consumption of constant velocity and New Europe Drive Cycle(NEDC)are studied. The starting and acceleration process of AMT are analyzed and the math models of clutch are established. The fuzzy control of engine throttle opening based on velocity difference and variable rate of velocity difference is studied and the optimum economy shift principle is formulated under the NEDC. The dynamic and economy simulation of 4 different AMTs is carried out using MATLAB/Simulink and MATLAB/Stateflow based on the vehicle parameters. The results indicate the relationship between vehicle dynamic and economy performance and transmission. The startup time is decided by the first gear ratio and the more ratio the less startup time. The least startup time is 1.48s from 8-gear AMT,which is less 8.1% than the most one(1.61s) from 6-gear AMT. The acceleration time is related to not only starting time but also gear quantity,gear ratio and shift principle. The least acceleration time to 100km per hour is 13.16s from 6-gear AMT,which is less 7.2% than the most one(14.18s) from 5-gear AMT. The least fuel consumption of NEDC is 6.533L per 100km from 10-gear AMT,which is less 3.8% than the most one(6.793L per 100km) from 5-gear AMT. The results indicate that the economy performance can be improved by increasing transmission gear quantity under the same condition.
作者
陈佳
王青春
吕欣
刘文健
CHEN Jia;WANG Qing-chun;LV Xin;LIU Wen-jian(Automotive Engineering Chengdu Aeronautic Polytechnic,Sichuan Chengdu 610100,China;Zhongjia Automobile Manufacturing(Chengdu)Co.,Ltd.,Sichuan Chengdu 610100,China)
出处
《机械设计与制造》
北大核心
2022年第3期76-81,86,共7页
Machinery Design & Manufacture
基金
四川省教育厅重点科研项目《载货汽车底盘优化设计技术》(15Z10343)
成都航空职业技术学院自然科研项目《基于MATLAB/Simulink的AMT换挡控制策略与性能仿真研究》(061911)。
