无级变速器车辆经济性巡航策略的伪谱法优化  

Optimization for economical cruising strategy of continuously variable transmission vehicle using pseudo-spectral method

作　　者：徐少兵[1] 李升波[1] 成波[1] 

机构地区：[1]清华大学汽车安全与节能国家重点实验室,北京100084

出　　处：《控制理论与应用》2014年第6期693-700,共8页Control Theory & Applications

基　　金：国家自然科学基金资助项目(51205228);清华大学自主科研计划资助项目(2012THZ0)

摘　　要：汽车行驶过程中的油耗不仅同车辆自身性能相关,也取决于驾驶员的操作方式.本文研究了装备无级变速器和汽油发动机的车辆的经济性巡航策略.首先建立了车辆纵向动力学模型和发动机油耗模型,将经济性巡航策略的辨识构建为一个最优控制问题.该问题的性能函数呈现高阶非线性且存在凹弧段,是一个典型的奇异最优控制问题.因此采用Legendre伪谱法进行求解.结果显示:当平均巡航速度较低或较高时,应采取匀速(CS)行驶策略;当中速时,"加速滑行"(PnG)策略更为经济,相对匀速策略最大节油率达13%.最后探讨了PnG策略的节油机理、经济性与舒适性的关系.The fuel consumption of passenger cars not only associates with their fuel-saving performance, but also depends on how they are driven. This paper investigates the economical cruising strategies for vehicles equipped with continuously variable transmission （CVT） and gasoline engine. A fuel optimized control problem is formulated after building models for vehicle longitudinal dynamics and engine fuel consumption. This is a typical singular optimal control problem with a nonstrictly convex cost function, so the Legendre pseudo-spectral method is selected to obtain its optimal solutions. The results show that vehicles should cruise at a constant speed （CS） when the average speed is either low or high; while the‘pulse-and-gliding’（PnG） strategy becomes more economical when the average speed is medium, the maximum fuel saving of PnG is 13%higher than that of the CS strategy. For the PnG strategy, the fuel-saving mechanism and the relationship between fuel economy and driving comfort are also explained.

关 键 词：经济性驾驶 巡航 伪谱法 最优控制 

分 类 号：U471.23[机械工程—车辆工程]