Energy Efficiency and Fuel Economy Analysis of a Parallel Hybrid Electric Bus in Different Chinese Urban Driving Cycles

Against a kind of parallel hybrid electric bus which is demonstrated in a city of China, a simulation model of the parallel hybrid powertrain system is established by referring to parameters of the demonstrating bus. Regarding the Chinese typical city bus driving cycle and the bus driving cycle of Harbin City, Heilongjiang Province as the driving cycles for the simulation, the fuel economy of the parallel hybrid powertrain system is analysed by using a method of the energy flow diagram. The simulation results reveal that the rate of fuel saving of the hybrid powertrain system is different under different driving cycles. It can reach 21.2% in the Chinese typical city bus driving cycle and 22.69% in the bus driving cycle of Harbin City, Heilongjiang Province. The fuel economy of the powertrain system can be optimized by improving motor and its controller, energy storage devices and other components, or the control method.