Dynamic Characteristics Of The Hybrid Vehicle Power Coupling Device

New energy vehicles is the inevitable trend of automobile development, and the major automobile companies of the world all focus on research of the hybrid cars. Power coupling device is an important component of a hybrid vehicle which relies on it to contact the multi-power source, and obtaining the best fuel economy and emissions performance. On the other hand, the gear transmission is currently the main way of the power coupling device, and the system always operates with vibration because of the gear transmission. so the power coupling device dynamic analysis has very important significance.In this paper, a new power coupling device is designed based on the transmission system of Prius, analyzing the drive principle matching the relevant parameters; creating the dynamics model of the system, calculating the twist displace and the engaging force in the internal and external excitation, and obtaining the system modal analysis and vibration response; finally, building the test platform, the experimental data has been compared to the calculating results to verify the validity the finite element model. And the specific work is as follows:(1) the original transmission system has been improved, and introducing the connection of the components, to analyze its structural characteristics and working principle, and to analyze the various modes of operation, based on the vehicle performance requirements and the structural parameters to reasonably choose the engine and the motors.(2) based on structural characteristics to establish the dynamics model of the transmission system under the bending and torsion, and to list dynamic equations of the system. When considering the all internal excitation, like gear varying stiffness?gear error ? meshing damping and so on, using numerical methods to calculate the displacement and the engagement force in the condition of overtaking.(3) the establishment of a three-dimensional model of the system, using the software ANSYS to obtain the modal parameters of the entire coupling device, applying the dynamic engaging force on the finite element model to calculate the displacement and acceleration of the four important points.(4) Introducing the programs and equipment of the test, using hammering method to test the model frequency, the vibration acceleration curves at two conditions have been obtained, the experimental data and the simulation results have been compared.