CAJ | 학술논문

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.
전통적무급변속전동계통최가경제성공제책략지고필사발동궤공작재기효솔최고적공작점,병몰유고필무급변속기(Continuously variable transmission, CVT)효솔대계통연유소모량적영향,이실제상무급변속기효솔수기공황적변화재70%도95%지간변화,대계통연유소모량적영향시불가홀략적.재분석계통연유소모량여발동궤효솔화무급변속기효솔지간관계적기출상,제출종합고필발동궤여무급변속기효솔적최가경제성공제책략,설계산법,이계통효솔최고위우화목표,대각수구공솔화차속하하발동궤여무급변속기연합고효공작적목표전속화전구진행계산.건립계통방진모형,대우화전후적공제규률진행방진대비분석,병재정차속공황하대우화전후적공제규률진행료대비시험.방진급시험결과표명,종합고필발동궤여무급변속기효솔적최가경제성공제가이실현절유2%좌우.
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.