基于SVM发动机模型的换挡规律及其应用  

Dynamic Shift Schedule and the Application of Dual Clutch Transmission Vehicle based on SVM Engine Model

作　　者：陈然[1] 米林[1] 谭伟[1] 

机构地区：[1]重庆理工大学汽车零部件制造与检测技术教育部重点实验室,重庆400050

出　　处：《机械传动》2012年第6期15-20,共6页Journal of Mechanical Transmission

基　　金：国家自然基金支助项目(2006AA1101140);重庆教委科技项目(2011KJ110825)

摘　　要：分析了双离合器式自动变速器车辆的频繁换挡及意外换挡现象,指出了引起DCT车辆频繁换挡的直接原因是车速相对于油门突变的滞后,根本原因是基于稳态工况的传统换挡规律无法满足动态工况下的要求。采用基于结构风险最小化准则的支持向量机方法建立了发动机动态转矩和油耗模型,提出了基于油门、车速、油门变化率为输入的三参数换挡规律设计方法,当油门突变时,系统能够根据油门变化率实时修正换挡规律,油门突增则降挡规律减小,油门突减则升挡规律增加,从而避免发生频繁换挡及意外换挡。运用Matlab/Simulink进行了DCT车辆的换挡仿真研究,并通过了自动变速器台架实验验证。仿真和实验结果表明基于支持向量机发动机动态模型的换挡规律在保留原有换挡规律优点的基础上,可以避免频繁换挡及意外换挡现象,满足车辆实际行驶工况的需要,具有更好的动力性和燃油经济性。The unreasonable shift phenomenon is analyzed,then,the direct cause is sudden change of pedal which gives occasion to shift hunting and the basic reason is the traditional shift schedule which is not satisfied with the dynamic state.The dynamic torque models of engine are built through support vector machine（SVM） identification.Based on that,a calculating method of dynamic shift schedule with 3-parameters is put forward.When the pedal sudden changed,the shift schedule real time changed too.A simulation model for shift is established using Matlab/Simulink,and tests have been made on bench test.Simulation and test results show that the shift schedule based on SVM model of engine can eliminate the improper shift in drive cycle and braking condition,and is superior to the shift schedule with traditional shift schedule in dynamic performance and fuel economy.

关 键 词：支持向量机 发动机模型 换挡规律 双离合器式自动变速器 应用 

分 类 号：U463.212[机械工程—车辆工程]