Energy Flow Analysis Of Parallel Gas-electric Hybrid Bus Based On Different Urban Driving Cycles

Energy security and climate change has been the strongest driver for the sustainable development of transportation industry. Plug-in hybrid buses, a typical representative of new energy vehicles, have received a multi-wide attention. In this paper, the same platform, the same configuration, the same gas-electric plug-in hybrid buses as a research object, would be running through Dongying, Liaocheng, Linyi, Puyang and Yantai, the remote monitoring system would feedback the massive operational data processing and analysis, fitting with the local operating conditions Markov chain method; and comparative analysis of its operating characteristics, combined with the operating characteristics of the running engine, motor, battery and other core components, rendering the vehicle energy flow patterns and vehicles, systems, components were analyzed; systematic assessment of the adaptability of the vehicle and working conditions, and providing components selection and control strategy optimization recommendations as a reference.The same platform, same configuration, plug-in gas-electric hybrid bus,as the research object, run the actual driving cycle in Dongying, Liaocheng, Linyi, Jining, and real-time operational data had been obtained, and utilizing Markov chain to fit local driving cycle, and comparative analysis of their operating characteristics; at the same time, based on quantitative analysis of the engine, motor, battery, AMT and vehicle energy efficiency, energy flow chart could be drawn and complete vehicles and key components would be analyzed; based on the energy flow chart, the distribution characteristics of the operating point of the motor and engine would be taken to evaluate the adaptability between the vehicle and the driving cycle, and then perpose certain product optimization recommendations.In this paper, there are three main achievements: first, perposing an assessment method to evalutate the adaptability between the vehicle and the driving cycle based on the fitted driving cycle, vehicle energy flow analysis, systematic engine and motor operating point analysis; second, different urban drving cycle, vehicle and components operation efficiency, and the operating point of the engine, as well as the motor, have been compared and analyzed, and relative adaptability has been achieved by this method; third, based on the analysis presented above, recommendations for optimizing vehicle energy management, engine, motor operating point has been proposed.