Research On The Performance Of Plug-in Hybrid Electric Bus

With excessive consumption of oil and gradual deterioration of environment, to find the effective way to reduce fossil fuel consumption and emissions is the most urgent task for the automotive industry presently. Plug-in hybrid vehicles can charge vehicle batteries from the external power grid, and raise the proportion of electric energy used in vehicles driving system, so it is one of the most promising new energy vehicles currently, and the study on it is of great significance.The main job of this thesis is to design plug-in hybrid drive system for the existing bus driven by internal combustion engine, and proceed to performance simulation for it. Firstly, through analyzed and compared the various structures of the existing hybrid vehicle drive system, according the practical requirement, the thesis designed a single-axis parallel torque coupling structure based on self-developed electric-drive mechanical transmission for drive system of the bus. The structure solved the problem that plug-in hybrid system is difficult to layout, and have the characteristics of compact, simple, reliable,installing easily, shifting rapidly and smoothly.Secondly, according to the structure designed for plug-in hybrid drive system, basic parameters of the original bus, and performance requirements the vehicle needs to achieve, major components of the vehicle including engine, motor, storage battery were selected and the parameters of plug-in hybrid drive system were matched. Then, the thesis studied several of the commonly used control strategies for parallel hybrid electric vehicles, and proposed a energy management strategy—hybrid control strategy based on rule-based logic threshold for plug-in hybrid vehicle. The strategy can make management and distribution of energy better in plug-in hybrid vehicles.Finally, a secondary development of parallel hybrid electric vehicle model of the ADVISOR software was carried on. The thesis built model of the plug-in hybrid bus which was designed in this paper and its main components, and took the simulation of vehicle performance in typical urban transit conditions of Chinese. Operating point of the engine and motor, the SOC curve of batteries, and the data got through simulation were analyzed. The results show that the vehicle has reached the dynamic performance of the design requirements, and fuel consumption per hundred kilometers increased by31%compared with the original bus driven by internal combustion engine.