This paper puts forward an energy flow chart analysis method for a range-extended electric bus. This method uses dissipation and cycle energy, recycle efficiency, and fuel-traction efficiency as evaluation indexes. In powertrain energy efficiency analysis, the range-extended electric bus is developed by Tsinghua University, the driving cycle based on that of Harbin, a northern Chinese city. The CD-CS and blended methods are applied in energy management strategies. Analysis results show with average daily range of 200 km, auxiliary power of 10 kW, CD-CS strategy, recycle ability and fuel-traction efficiency are higher. The input-recycled efficiency using the blended strategy is 24.73% higher than CD-CS strategy, while the output-recycled efficiency when using the blended strategy is 7.83% lower than CD-CS strategy.

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This paper introduces a systematic problem, which investigates the power management for the range-extended electric bus using dynamic programming. The Chinese typical city bus driving cycle and the bus driving cycle of Harbin City, Heilongjiang Province, China are expressed as the driving cycles in the DP process. The simulation model is established by referring to parameters of the REEB which is developed by Tsinghua University. And the power split ratio is introduced to analysis the simulation result. The DP results shows that the working points shows obvious rule by referring to power split ratio. The energy consumption and the fuel consumption are significantly lower than the conventional bus.I.