Theoretical Analysis And Experimental Study Of Differential Gear Train For Parallel Hybrid Electric Vehicle

The theoretical analysis and experimental study of the power synthesis device of the parallel hybrid electric vehicle-differential gear train is accomplished in the thesis, the correctness of the Theory of Steady State Characteristics of the differential gear train is systematically verified in this thesis in two different aspects of steady-state and dynamic characteristics. The establishment and solve method of kinetic equation of the differential gear train is achieved from the energy point. The transient change of the system in the process of energy transformation is acquired combined with the experiment, which provide a theoretical and experimental support for the practical engineering applications.A comprehensive and detailed theoretical research on steady-state characteristics theory of differential gear train is accomplished at first, its experimental study is then finished by differential gear train testing. A 2K-H type WW-like differential gear train is built in test bench to acquire the experimental data under different rotational speed and torque, the parameters of steady-state characteristics of the differential gear train such as transmission ratio, torque, power and efficiency are studied and discussed, which lay a foundation to the basic theoretical research. Based on this, the sensitivity issue of the rotational speed and torque of the differential gear train is analyzed in detail by the experimental study. A work bench improvement plan is proposed from the aspect of system rotational speed and torque sensitivity of the differential gear train.Second, from the energy point, the dynamic analysis on the differential gear train is carried out in a new perspective using dissipation theory of analytical mechanics. Based on tribology and flexibility hydrodynamic lubrication theory, the dissipation function is introduced to the system dynamics equations of the differential gear train. The establishment of complete system dynamic equations and simulation solving approach and dissipative force parameter identification methods are achieved using second category Lagrange equation and variational principle. The transient change characteristics of the tested differential gear train are achieved by solving dynamic equation, simulation results combined with the test data, which examined the system rotational speed and transient sensitivity torque to provide a theoretical and experimental support for the practical engineering applications.