Abstract
China introduced Worldwide Harmonized Light Vehicle Test Procedure (WLTP) in pollutant emission management and fuel consumption type approval test standards for passenger vehicles in 2019 and 2021. The switching of test procedures from the New European Driving Cycle (NEDC) to WLTP will significantly impact carmakers' fuel consumption target and technology compliance strategies. Assessing the impact of WLTP replacing NEDC on fuel consumption and fuel-efficient technology is necessary and urgent. Based on the data of 1038 samples tested under both WLTP and NEDC and the econometric model built in this paper, we analyse the impact of introducing WLTP on fuel consumption and key fuel-efficient technologies. The results show that fuel consumption of gasoline passenger vehicles based on WLTP is 8% higher than that based on NEDC. Switching from NEDC to WLTP has adverse effects on HEV and 48V. It has a slightly beneficial impact on gasoline direct injection (GDI) models and slightly adverse effects on multi-gear automatic transmission (AT) models and models with start-stop.
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