The Simulation Analysis and Control System Design of Hybrid Electric Vehicle
|School||Wuhan University of Technology|
|Keywords||Balanced distribution of torque Control strategy battery managementsystem heat balance|
With the people’s living standards improved and the number of cars increased dramatically in China, which caused heavy pressure on the energy supplying, at the same time, the atmospheric environment was further deterioration. Therefore, it is extremely important to alleviate vehicle emissions and improve urban living environment through an effective solution to decrease fuel consumption and emissions.In order to improve vehicle performance, reduce energy consumption and emissions. Electric cars, hybrid vehicles, fuel cell vehicles and other new powertrains emerging as a hot spot in recent years. Combined engine and motor drive systems could improve vehicle performance, reduce vehicle emissions and so on, when it compared with electric vehicles. Furthermore, a longer driving range, low-emission hybrid vehicles are expected to be a product of the transition.This paper describes the current state of the development of HEV. Through analysis and comparison of several HEV structural arrangement such as series electric vehicle, parallel electric vehicles, hybrid electric vehicles, combined typed hybrid vehicles the strengths and weaknesses. To establish a viable structure of BSG mild hybrid structure to satisfy with vehicle design requirements; In this structure, to begin with, designed the BSG’s power components, and analyzed the dynamic characteristics of these components. Then built simulation model in the simulation software of CRUISE, and made a detailed analysis combine with the various conditions of vehicle operation, given a balanced distribution of torque control strategy to optimize the vehicle power system transfer efficiency and engine efficiency. Finally, this paper provided the vehicle operating conditions estimated with power needed to trigger the condition of the control mode, then described the power allocation algorithm with the control model. The control model of rationality has been verified through simulation analysis.Because the power battery as an important power producer in hybrid vehicles, how to protect and extend battery life to be a major problem. In this paper, battery management system control strategy integrated with battery characteristics and energy requirements to make reasonable optimization. At the same time, given the battery heat balance simulation model in order to prevent battery charge and discharge capacity limitation for the thermal effect. The HCU and BMS control strategies of BSG hybrid vehicle in SIMULINK software, import into CRUISE simulation model by generating a dynamic link library DLL. Simulation results verify the merits of the BSG control strategy and compared with conventional internal combustion engine-driven and traditional BSG mild hybrid vehicle. Especially, in terms of economic and environmental advantages.