无级变速传动系统整体优化控制策略  

Overall Optimization Control Strategy of Continuously Variable Transmission System

作　　者：郝允志[1,2] 孙冬野[1] 林毓培[1,2] 刘升[1] 

机构地区：[1]重庆大学机械传动国家重点实验室,重庆400030 [2]西南大学智能传动与控制工程实验室,重庆400715

出　　处：《机械工程学报》2013年第12期84-91,共8页Journal of Mechanical Engineering

基　　金：国家自然科学基金(51075410);重庆市科技攻关计划(2010AC6049)资助项目

摘　　要：传统的发动机最佳经济性和最佳动力性控制策略不能保证传动系统整体性能最优。以无级变速传动系统整体性能最优为目标,从经济性、动力性和瞬态工况特性三个方面论述基于功率需求的整体优化控制策略。制定发动机、液力变矩器和无级变速器的整体效率优化算法,求解最佳节气门开度控制表、最佳速比控制表和液力变矩器理想闭锁控制线。在经济性模式下,以满足功率需求的整体最高效率点作为控制目标;在动力性模式下,根据功率需求计算目标节气门开度,以当前车速下的整体最大功率点的速比作为目标速比。在瞬态工况下,直接以车辆有效驱动功率作为控制目标,结合发动机转矩补偿与速比变化率限制,给出恒功率和零功率两种量化控制模式。仿真结果表明,整体优化控制策略使经济性提高3.2%,40～80 km.h–1的超车加速时间缩短13.7%,避免急加速过程中的动力疲软现象。Conventional control strategy of engine optimal economic operation line and optimal dynamic operation line can＇t lead to optimal performance of overall transmission system. At the aim of optimal overall performance of vehicle continuously variable transmission system, overall optimization control strategy based on power demand is studied from economic, dynamic and transient performance. Efficiency optimization algorithm is designed for whole transmission system consisted of engine, torque converter and continuously variable transmission. Best throttle opening control table, speed ratio control table and ideal state switch line of torque converter are described. In economic mode, take the highest efficiency condition meeting the power demand as the control target. In dynamic mode, take the highest power condition＇s speed ratio as the control target while the throttle opening is calculated according to power demand. In transient condition, take the effective driving power of vehicle as the control object by adopting engine torque compensation and ratio shift speed limitation. Constant-power and zero-power control modes are presented. Simulation results show that, by adopting overall optimization control strategy, economical efficiency improved by 3.2%, 40-80 km h-l acceleration time reduced 13.7% and phenomenon of power fatigue under transient condition is eliminated.

关 键 词：无级变速器 控制策略 优化 有效功率 

分 类 号：U463[机械工程—车辆工程]