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With the development of the economy, the city traffic become heavier in China. The urban bus often stops but its speed is not very high. What’s more, the heavy consumption of fuel is causing serious pollution to the urban environment. In order to solve this problem, components parameters of series hybrid electric bus (SHEB) are designed and matched with the ADVISOR simulation software based on Matlab_simulink. Compared to the traditional bus, SHEB greatly improves fuel economy and reduce the emissions. INTRODUCTION The urban environment is increasingly being paid more and more attention. Citizens also call for higher requirements for the city traffic. The traditional vehicles bring great pressure to the environmental protection [1]. SHEB is especially suitable for frequent starting and low speed operation condition in the city. The engine can avoid the idle speed and low speed working condition, so as to improve the efficiency of the engine. Meanwhile SHEB can get electricity from electric network source and use the pure electric mode within a certain range to reduce the dependence of petroleum resources and the emissions [2]. ADVISOR is a simulation software developed by U.S. National Renewable Energy Laboratory, The application of this software in new energy vehicles greatly reduces the research period and cost . STRUCTURE AND PARAMETERS OF SHEB There are three connection types used in hybrid electric vehicle (HEV) including series HEV (SHEV), parallel HEV (PHEV), series/parallel HEV (SPHEV) [3].The engine always works best in fuel economy or in the most efficient region in SHEV and its operation is not affected by the condition of the vehicle. The power source of series structure is only motor, which is similar to pure electric vehicle, and its control strategy is simpler. The power assemblies are electrical connections which is flexible and easy to arrange. In the center area of city SHEV structure can realize zero emission like the pure electric mode, and only when the power battery below the limit can the engine supply electricity to power battery. Because plug-in equipment is connected to the system from the outside electric network source, it will Improve fuel economy performance [4]. SHEB, as defined in this paper, is shown in Figure 1. The ISG motor in SHEB is more powerful than other structures and is more conducive to the recovery of braking energy. Since the motor has the natural characteristics of high  Liang Fang, Tianjin Vocational Institute, Tianjin, China

The Design and Simulation of Plug-in Series Hybrid Electric Bus