System Design And Analysis For Parallel Hybrid Electric Bus

This article elaborated the original drive train system design of hybrid electric Bus XML6112PHEV of Xiamen Golden Dragon Coach Co.Ltd, which including the match design, mathematics modeling, simulation analysis, prototype test, and its phase results.Firstly, parallel hybrid drivetrain is selected as the drive system of the prototype according to its use requirement. The structure of the drive system is conceptive designed based on the recent level of the hybrid electric vehicle in the world. The parameters of the key components are computed and optimally matched by the analysis of the system and their special characteristics.Secondly, the methodology and modeling issues of the drivetrain components were described by making reference to the model presented in some paper. Based on Matlab/Simulink modeling environment, the rear wheel drive components are modularized and can run in the ADVISOR (Advanced Vehicle Simulator), a MATLAB simulation program developed by the U. S. Department of Energy's National Renewable Energy Lab. These ensure the utility and reliability of the model. During the simulation input step, the input of engine map and motor efficiency map are very difficult, so their solutions were given great emphasis. To improve the precision of the simulation, the advanced options of the ADVISOR (such as Grade test and Acceleration Test) were newly set up.This article carried on the simulation analysis to the proto type, the power performance showed accord with the design goal. Conducted tests verified the insufficient accumulator cell capability problem, Which Was found in the simulation analysis of the major components.As a very importment part of design, the method adopted during the testing process together with the collection of vehicle speed and engine speed data of the actual Shanghai operating mode is introduced. The reliability of simulation and the correctness of modeling is verified during the vehicle operation. Also the insufficient accumulator battery problem is analyzed and its solution is raised. In comparison with other equivalent ones, the hybrid electric bus satisfied the design goal, 30% fuel saved.