基于参数统计特征的无级变速车辆智能控制策略  

Intelligent Control Strategy of Vehicles Equipped with Continuously Variable Transmission Based on Statistic Feature of Driving Parameters

作　　者：罗勇[1] 孙冬野[1] 秦大同[1] 胡建军[1] 廖建[1] 

机构地区：[1]重庆大学机械传动国家重点实验室,重庆400044

出　　处：《机械工程学报》2011年第18期101-109,共9页Journal of Mechanical Engineering

基　　金：国家自然科学基金(50475066);重庆市科技攻关计划(2010AC6049)资助项目

摘　　要：装备无级变速器(Continuously variable transmission,CVT)的车辆采用经济性控制时,发动机后备功率小,急加速工况下只能通过提高转速来增加功率输出,而发动机转速提高要消耗相应功率,导致车辆动力不足。基于实时参数的控制策略只能在加速过程开始后再控制发动机工作点向动力性线偏移,这一过程仍需要通过提高发动机转速来实现,对提高CVT车辆的动力性作用有限。车辆行驶参数的统计值包含车辆行驶的历史信息,且能随行驶工况的变化而变化,这是制定控制策略的重要依据。针对已有控制策略的不足,在对各参数统计特征进行分析的基础上,提出根据行驶参数的统计值来调整发动机稳态工作线的控制策略。仿真及试验表明,新的控制策略能根据统计参数的变化合理调整发动机稳态工作点,对车辆工况变化具有自适应能力;同时,该控制策略避免了对实时参数的依赖,可以在某一动态过程开始前就使发动机工作在后备功率较大的稳态工作线上,有利于提高动态过程的动力性。When continuously variable transmission（CVT） works under economic mode,backup power of engine is low.Engine can increase its output power mainly by increasing its rotation speed,which will consume corresponding power and make the vehicle lack of drive power during kick down conditions.Shift strategies based on real time parameters can move the working point of engine towards its peak power line only after a transient had began,as moving of engine working point can be achieved only by increasing the engine speed,these shift strategies can＇t improve the vehicle power performance effectively.Statistic features of driving parameters have many choiceness characteristics as they contain the information of driving history,and can change along with the work conditions of vehicle.With this in mind,a control strategy based on statistic features of driving parameters is proposed to tune the target engine working point.Simulation and experiment results indicated that,the working point of engine can be tuned by the proposed control strategy properly when the work condition of vehicle changes.Moreover,the proposed control strategy avoids to depend on the real time parameters,and can make the engine works on a point with more backup power before a transient had began.Power performance of CVT equipped vehicle was improved effectively under the proposed control strategy.

关 键 词：汽车 无级变速器 行驶环境 智能控制策略 

分 类 号：TH132[机械工程—机械制造及自动化]