Dynamical Analysis And Modeling Of Single-Loop System For Parallel Hybrid Electric Vehicle

In this thesis, a series of important problems such as kinematics, dynamics and the design principle of the key parameter about a new PHEV transmission system in which the closed differential step-less variators (CDSV) is used as main transmission are investigated systematically, and the analytical results can be helpful for the establishment of the design standard.Based on the required performance and the theoretical analysis of CDSV, such as the transmission ratio, torque, power flow and transmission efficiency, the scheme and the design principle of the key parameter of CDSV which is used as the main transmission in the transmission system of the parallel hybrid electric vehicle (PHEV) have been gotten out. The dynamic behaviors of CDSV have been systematically researched later. A dynamic model with every part separated is proposed to predict the dynamic behaviors of the encased differential gear train. Stability and Responses of the XP and PX system has been researched under the condition of same parameter. The dynamic characteristics of the model have been analyzed in detail, and the system dynamics results can be used for the preferences of every part.The dynamics of the power synthesizer are studied systematically in this paper. The power synthesizer can be divided into three kinds, the rotary speed synthesizer, the torque synthesizer and the traction synthesizer. Dynamic models of the rotary speed synthesizer and the torque synthesizer which have been widely used are proposed to predict the dynamic behaviors.Finally, the transmission system which is composed of rotary speed synthesizer and CDSV system has been analyzed under the condition of known parameter.