Powertrain Simulation Research Of Coaxial Series-Parallel Hybrid Electric Bus Based On Advisor

Hybrid electric buses are the main force of today’s new energy vehicles and the most marketable type of the new energy vehicles. The domestic technology of series-parallel hybrid electric buses still has some blanks. It is completed that the structure analysis, the model selection and the parameter matching of the coaxial series-parallel hybrid power train. Two kinds of the engine control strategy of the motor auxiliary control strategy and the fuzzy logic control strategy are established. A system simulation platform for coaxial series-parallel hybrid vehicle is developed in the Advisor software. The reasonable and reliable simulation result is obtained and can provide the theoretical support and the technical guidance for the practical vehicle prototype development. It has an important significance to reducing the vehicle development cycle and development cost.The power train’s arrangement form of the simulation vehicle is selected by comparing the different power train structures on basis of operating conditions, technical requirements, power performances, and so on. A detailed analysis of the operating mode is carried out by the energy flow direction of the system.The type selection of the power train is determined by the analysis of operating requirements, technical conditions and economic cost of the transmission components. According to the design goal of the vehicle performance, the parts’parameters matching are completed by the theoretical calculation and engineering analysis on the principle of the transmission system working in high efficient area.Aiming to the coaxial series-parallel hybrid power train, two different kinds of engine control strategy of the motor auxiliary control strategy and the fuzzy logic control strategy are established and are embed into the Advisor simulation software on the energy distribution strategy that the engine works in high efficient area.The simulation model of coaxial series-parallel hybrid bus is established by the software models or model modifications. And the Advisor software is secondarily developed to set up a new simulation platform for the series-parallel hybrid power train by modifying the simulation files and so on.Finally, the driving cycle and the simulation conditions are selected and the simulation of hybrid power train is completed. The simulation results of the vehicle power performance and the fuel economy performance are gotten.Analyzing the results of actual achieved values of performance indicators, the change process of SOC value and relationships of actual output torque among power components and comparing the torque and efficiency working points’ distributions of engine and motor on two kinds of control strategies, it is known that the coaxial series-parallel hybrid power train can satisfy the design goals of power performance and economic performance. Meanwhile, the feasibility of the transmission system and the applicability of the simulation platform are verified. It provides an effective and reliable method for the research and development of series-parallel hybrid electric bus.