Research On Powersystem Parameter Matching And Coordinated Control Strategies Of ISG Hybrid Commercial Vehicle

Energy shortages and environment deterioration has reminded people the importance of energy conservation and environmental protection. Old Automobile industry should be replaced because it has consumed a lot of energy and polluted the environment. Before the advanced technologies compare favourably with internal combustion engine driven technology, the hybrid electric vehicles are best choice. The commercial vehicles especially the buses in the cities have consumed a lot of oil. The bus engine is always working in low efficiency for a long time and it is hard to reduce fuel consumption. With this background, the paper tried to modify bus chassis system to hybrid structure so that the fuel consumption could be reduced.The hybrid electric vehicles have many kinds of structures. The paper puts ISG motor into power system after considering various factors such as costs and main operating characteristics of the bus. Based on the bus power performance, parameter matching and suitable parts for power system choice are finished in the paper.According to the problem of high cost of real vehicle performance analysis, the simulation model for study the new hybrid bus is designed in the paper. The ISG hybrid bus model is established in the AVL/Cruise platform by combining theoretical data with the experimental data. Model data interface which could connect with other software is also designed in the paper.According to the problem of energy distribution for hybrid bus engine and ISG motor, the paper analyzes the vehicle’s running mode. In order to improve the utilization efficiency of bus engine, the control strategy of torque distribution is designed. The engine and ISG motor output torque distribution in different running modes of bus and conditions for transition of running modes are studied in the paper.In order to verify the correctness of the vehicle control system, combined control strategies and simulation platform, the actual operation of the car is simulated. The simulation including fuel consumption in specific road conditions, accelerating ability from0to50kilometers per hour and climbing performance with the lowest gear. The simulation results demonstrate that all aspects of vehicle performance meet the requirements. Fuel consumption is reduced to about83%.Finally, in order to solve the problem during matching for decelerate device, the different gear-boxes and main reducing gears are combined free and the simulations are in operation. The optimum decelerate device is selected.