关键词: 混合动力汽车, 驱动工况, 无级变速器, 系统效率

Abstract: The experimental numerical molel for the efficiency of key components of a mild hybrid electric vehicle with continuously variable transmission(CVT) is built. Based on the efficiency model and the longitudinal dynamics equations of the mild hybrid power system, the formulas for calculating the system efficiency under different driving conditions of hybrid electric vehicle are derived and the model for system efficiency optimization is obtained. The sequential quadratic programming (SQP) algorithm is applied to calculating the optimization of system efficiency of the mild hybrid electric vehicle under different driving conditions, so the electrical motor/generators power and the optimal CVT speed ratio under the different driving conditions. The research provides a method for optimizing the control strategy to improve the system efficiency of the CVT mild hybrid electric vehicle.

Key words: Continuously variable transmission(CVT), Driving conditions, Hybrid electric vehicle, System efficiency