考虑CVT效率的无级变速车辆最佳经济性控制  

Fuel Optimal Control of CVT Equipped Vehicles with Consideration of CVT Efficiency

作　　者：罗勇[1] 孙冬野[1] 秦大同[1] 陈然[1] 胡丰宾[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》2010年第4期80-86,共7页Journal of Mechanical Engineering

基　　金：国家自然科学基金(50475066);博士后基金(20090450782);重庆市自然科学基金(2007BB0112)资助项目

摘　　要：传统的无级变速传动系统最佳经济性控制策略只考虑使发动机工作在其效率最高的工作点,并没有考虑无级变速器(Continuously variable transmission,CVT)效率对系统燃油消耗量的影响,而实际上无级变速器效率随其工况的变化在70%到95%之间变化,对系统燃油消耗量的影响是不可忽略的。在分析系统燃油消耗量与发动机效率和无级变速器效率之间关系的基础上,提出综合考虑发动机与无级变速器效率的最佳经济性控制策略,设计算法,以系统效率最高为优化目标,对各需求功率和车速下下发动机与无级变速器联合高效工作的目标转速和转矩进行计算。建立系统仿真模型,对优化前后的控制规律进行仿真对比分析,并在定车速工况下对优化前后的控制规律进行了对比试验。仿真及试验结果表明,综合考虑发动机与无级变速器效率的最佳经济性控制可以实现节油2%左右。Conventionally,continuously variable transmission（CVT） improves fuel economy by ensuring the engine works under a high efficiency condition.However,this method does not pay any attention to the CVT efficiency.The CVT efficiency changes from 70% to 95% with its work condition,which also has considerable influences on fuel consumption of the system.Based on the analysis of how CVT efficiency and engine efficiency influence the fuel consumption of the system,an optimal economy control method with consideration of both engine and CVT efficiency is proposed.An optimal algorithm is proposed to calculate the combinations between the engine torque and CVT ratio in order to achieve the highest overall efficiency of engine and transmission system.A simulation model is built to validate the optimal algorithm.Experiment under several static vehicle speeds are also carried out to validate the control method.Simulation and experiment results indicate that fuel consumption of the system is reduced by more than two percent after the optimization.

关 键 词：无级变速传动 效率 最佳经济性控制 

分 类 号：TH132[机械工程—机械制造及自动化]