| Abstract: | To assist OEMs in reasonably, accurately determining the declared value of fuel consumption for both type approval and COP, thereby gaining more CAFC benefits, it is essential to standardize driving behavior, which is a key factor influencing fuel consumption tests. This can be achieved by introducing driving evaluation indices and brake pressure. Moreover, setting specified requirements ensures the accurate and repeatable measurement results. Eight drivers, each with several years of driving experience in emission dyno testing, along with two light-duty gasoline vehicles, were employed to conduct a large number of emission tests on the chassis dynamometer under NEDC and WLTC conditions. The driving evaluation indexes were calculated based on the data sampled at a 10 Hz frequency. Through statistical analysis, the influence of driving style on vehicle running smoothness is greater in NEDC compared with WLTC. This is attributed to the greater degree of freedom given to the driver under the stable conditions in NEDC. For the WLTC, setting IWR and RMSSE limits based on the empirical values ensures that the cycle is performed under qualified driving. Besides, regulating the maximum brake pressure during the cycle is an effective measure. This paper offers insights into minimizing the variance caused by different drivers in fuel consumption tests and it provides a method to accurately calculate carbon emissions, both of which can contribute to the progress in achieving China''s Dual-Carbon goals in automobile industry. |
