Research On The Vehicular Performance Of Hybrid Electric Vehicle Over Different Driving Cycles

Since the 21st Century, due to the over consumption of non-renewable resource and worsening problem of living environment, people more and more concern about that. Energy and environment have been developed as a sustainable strategy which the governments of all over the world must solve as soon as possible. Therefore, the development of electric and hybrid vehicles which can improve the energy consumption and emission has taken on an accelerated pace. Hybrid Electric Vehicle (HEV) is a vehicle in which propulsion energy is available from two or more kinds or types of energy stores, sources or converters, and at least one of them can deliver electrical energy. It has inherited the strength of high energy density and high power density of IC cars. While, HEV, which also takes the advantage of electric drive to achieve the target of low discharge and saving energy, has become the main stream developing vehicles which all the countries want to commercialize.The thesis has been studied under the national"863"project-"Jie Fang Hybrid Electric Transit Bus". Compared to the traditional Internal Combustion Engine cars, only when HEV is working on the driving cycles which have the characteristics of over idling, acceleration, deceleration and stops can display its strength in saving fuel economy and improving the emission. Thus the paper is focused on the fuel economy of HEV over different driving cycles.Firstly, after analyzing the advantages and disadvantages for series, parallel and series-parallel configurations, the paper selects the parallel configuration as the research object. Based on the required design specification, the types of HEV major components such as engine, traction motor and transmission are selected. The design of IC engine power, traction motor power, gear ratio and the voltages of storage is also completed. Secondly, after the selection of major components of HEV, the paper analyzes the problem of different hybridizations and studies other vehicle parameters such as vehicle mass, rolling resistance and aero resistance. Simulated by the software ADVISOR, the thesis also calculates the fuel consumption of different driving cycles and concludes some characteristics and rules of these driving cycles. Then based on the Principal Component Analysis, find the most important parameters which have huge impact on the fuel economy of HEV in all the parameters in driving cycles. Use the ADVISOR to testify whether these parameters resulted by PCA can change the vehicle fuel economy apparently. Finally, design the fuzzy control strategy based on the principal components of driving cycles for HEV and analyzes it. Compare the fuel economy, vehicular dynamic performance and SOC of the fuzzy control strategy with other existent control parallel control strategies over the specific driving cycle.