Design And Simulation For Parallel Hybrid Electric Vehicle

As the save energy and environment protection, the substitute energy vehicle, fuel cell electric vehicle, battery electric vehicle, diesel passenger car, hybrid electric vehicle(HEV) and so on new type of vehicles are on behalf of the focus and direction for automotive technologies'research and development. By comparing these new type vehicles and considering the automotive industry state, we believe that researching and developing hybrid electric vehicle is the best effective and feasible way for the industrialization of saving energy vehicles under nowadays conditions.There are many types HEV, a simple structure, compact layout, high efficiency, feasible matching, easier control hybrid transmission is the key for a successful HEV. So, this dissertation begin with analyzing the all kinds of HEV structures, their advantage and disadvantage, then, it is concluded that parallel hybrid electric vehicle(PHEV) and planetary gear have their obvious predominance in all types of HEV or hybrid transmissions.Subsequently, By combining the planetary gear and traditional automobile gear box, like automated mechanic/manual transmission(AMT/MT), automated transmission(AT), continuously variable transmission(CVT), dual-clutch transmission(DCT), and according to HEV operation mode, taking the complete function, compact structure, simple control, feasible project as design regulations, ten types of four kinds feasible PHEV transmission system are designed. Then, a belt-CVT design was selected by comparing those designs. Therefore, the speed ratio, efficiency, cycle power flow characteristics are analyzed.Thereafter, the matching parameters about planetary gear, speed ratio of CVT, engine, battery, generator/motor and other assembly related to power system, power train system are designed based on the selected design and SC7130 vehicle parameters, also, the basic regulations of improving fuel economy and no acceleration performance loss and the predominance of multi mode combined for HEV are considered.After the parameters matching design was finished, the regenerative braking energy, speed ratio control for CVT, control strategy for vehicle operation mode exchange and methods are decided. And base on these studies, the whole vehicle power train model is built under the MatLab/Simulink environment. At last, the hybrid electric vehicle's acceleration performance in the pure motor driving, engine driving and hybrid driving mode and fuel economy under UDDS cycle and 1015 cycle are simulated. All the simulation results exceed the former SC7130 vehicle greatly.