基于“虚拟离合器”的混合动力车辆AMT换挡过程控制  

Shifting Process Control of AMT Based on Virtual Clutch Technology for Hybrid Electric Vehicle

作　　者：沈文臣 胡宇辉[1] 于会龙[1] 席军强[1] 陈慧岩[1] 

机构地区：[1]北京理工大学机械与车辆学院,北京100081

出　　处：《机械工程学报》2014年第18期108-117,共10页Journal of Mechanical Engineering

基　　金：国家高技术研究发展计划资助项目(863计划;2011AA11A252)

摘　　要：自动机械变速器(Automatic mechanical transmission,AMT)是单轴并联混合动力系统中的核心部件,对其换挡过程的快速、精确控制直接决定着混合动力系统的加速性、经济性、使用寿命以及可靠性。一种基于'虚拟离合器'技术的混合动力系统AMT换挡过程控制方法可以充分保证其性能。该方法的五个时序进行详细论述,并分别提出各个阶段的核心控制问题。基于该单轴并联混合动力系统的结构特点,建立以考虑传动系统中驱动轴扭转振动特性的动力学模型,在此基础上,推导出可用于换挡过程控制的机械自动变速器中传递转矩的近似数学模型;通过试验验证该模型可以有效控制变速器传递的转矩,降低摘空挡后变速器输出轴转速的振荡。实车试验表明以变速器传递零转矩为目标的'虚拟离合器'技术可以有效应用于AMT的换挡过程控制。该技术的应用可以实现AMT无离合器操控的换挡过程,能够有效缩短换挡过程动力中断的时间,降低换挡过程车速的振荡,提高AMT系统的换挡品质。Automatic mechanical transmission（AMT） is the core plant of a single shaft parallel hybrid electric system, whose acceleration, economy, lifetime and reliability largely depend on the rapid, accurate control of AMT’s shifting process. The shifting process control of AMT based on virtual clutch technology is proposed and above all, the five sequential process of the mentioned method are expounded in detail, in which the primary control problems of every stage are put forward. According to the system’s structure, the dynamic model considering the driving shaft’s torsional vibration in the drivetrain is built up and the approximate mathematical model of the transmitted torque in AMT that can be used in shifting process control is deduced. This model is validated in trial that it can control the torque transmitted in AMT and weaken the oscillation of the output shaft’s rotate speed after shifting into neutral gear. Vehicle trial shows that virtual clutch technology aimed at zero torque transmitted in transmission is able to apply on the shifting process control of AMT. The application of this technology can realize the gear shift of AMT without clutch manipulation, effectively decrease the time of power interrupt during shifting process, reduce the oscillation of vehicle speed and improve the shifting quality of AMT system.

关 键 词：虚拟离合器 混合动力传动系统 换挡过程 自动机械变速器 变速器传递转矩 

分 类 号：U463[机械工程—车辆工程]