Research on fuel consumption characteristics of light vehicles based on chassis dynamometer test
A detailed analysis was conducted on the fuel consumption measurement values of different light-duty gasoline vehicles to explore the factors affecting fuel consumption of light gasoline vehicles and provide experimental data support for the development of real-time fuel consumption data correction methods for on-board diagnostic systems(OBD),thereby promoting refined control and management of motor vehicle fuel consumption.The light-duty gasoline vehicles(LDGVs),complying with emission standards phases V and VIb(China V and VIb),were tested under both cold-and hot-start conditions using the Worldwide Light-duty Test Cycle(WLTC).Transient operating parameters of each engine and each entire vehicle were read by an OBD system during the testing.Subsequently,the fuel consumption of the tested LDGVs at different starting temperatures and speeds were calculated using the carbon balance method and the OBD air fuel ratio method.The effects of temperature and speed on fuel consumption of different LDGVs were also analyzed.The interpolation method was applied to compensate for the data loss during the OBD parameter reading process,enhancing the linear correlation coefficients in instantaneous fuel consumption between the two calculation methods.Furthermore,the causes of errors in OBD fuel consumption calculation were investigated.The results showed that the fuel consumption of China VIb LDGVs is less affected by the starting temperature than China V,with cold start fuel consumption only 2.02%～2.27%higher than hot start.The LDGVs equipped with gasoline particulate filter(GPF)have a fuel consumption increase of approximately 0.48 L per 100 kilometers compared to vehicles without GPFs,and the increase in fuel consumption caused by GPF is related to the driving speed.The repeated start stop of the engine in the low-speed range will result in fuel consumption reaching 1.46 times that of the entire stage.Uncertainties of the measured fuel consumption in OBD mainly occur in the deceleration stage of the vehicle.
NETL
NSTL
万方数据
