Abstract
Against a kind of parallel hybrid electric bus demonstrating in a city of China, based on the analysis of the bus configuration, a simulation model of the parallel hybrid powertrain is established by referring to parameters of the demonstration vehicle. Regarding the Chinese typical city bus driving cycle and the bus driving cycle of Harbin City, Heilongjiang Province, China as the driving cycles for the simulation, the energy efficient and fuel economy of the parallel hybrid powertrain are analysed by using a method of the energy flow diagrams. The simulation results reveal that the parallel hybrid electric bus has higher energy efficiency by using the ultracapacitor and the permanent magnet synchronous motor. Under different driving cycles, the rate of fuel saving is different in the hybrid powertrain. It can reach 26.58% in the Chinese typical city bus driving cycle and 28.11% in the bus driving cycle of Harbin City, Heilongjiang Province.
KEYWORDS – Parallel hybrid powertrain, Driving cycles, Energy efficiency, Fuel economy, Analyse