Research For Kinematics Of Hybrid Electric Vehicle

A large number of traditional vehicles have caused serious environmental pollution and fossil energy consumption. Electric vehicle to replace the traditional vehicle is imperative, but the bottleneck of battery technology and the popularity of charging equipment, and other issues will undoubtedly hinder the development of electric vehicles. Thus, the hybrid electric vehicle has become an important and indispensable link of the development from the traditional vehicle to the electric vehicle.In this thesis, three kinds of hybrid electric vehicles with different power transmission arrangements are compared, and carried on the preliminary introduction of hybrid electric vehicles' running mechanism through the domestic and international examples of HEV. The advantages and disadvantages of the structure, the difficulty of development, the fuel economy, the problem of energy saving and emission reduction are analyzed in detail, finally select the series plug-in hybrid electric vehicle (SPHEV) as the basis of this thesis. Proposed the design requirement of dynamic performance, and based on the dynamic performance of motor, power battery, engine and generator parameters for computing matching, design parameters and specifications of each by the SPHEV power system structure.In this thesis, the braking process of HEV is analyzed, and the braking system is analyzed. The dynamic model is established, and the following conclusions are drawn from the dynamic mathematical model:(1) when the target braking force is less than the maximum regenerative braking force, the total energy of the composite braking system is in inverse proportion to the displacement of the braking process. (2) when the target braking force is greater than the maximum regenerative braking force, the total energy of the composite braking system is proportional to the time of the braking process. And the specific factors that affect the total amount of braking energy recovery of the HEV are analyzed.The simulation analysis is carried out to meet the design requirements by using the software ADVISOR. The calculation data show that the main components of the technical parameters and vehicle performance to achieve the design objectives, the performance of the vehicle fuel economy is better than the basic models.