Chatzipanagi A, Pavlovic J, Ktistakis M A, Komnos D, Fontaras G
European Commission, Joint Research Centre (JRC), Ispra 21027, Italy.
Transp Res D Transp Environ. 2022 Jun;107:103287. doi: 10.1016/j.trd.2022.103287.
A new vehicle testing procedure (WLTP - Worldwide Light duty vehicle Test Procedure) was introduced in the European Union (EU) in 2017. In order to examine its actual impact on CO emissions for different vehicle technologies and categories, this study analysed data from vehicles certified and registered in the EU in 2019 and 2020. It was found that in average, for all vehicles sold in 2020, the increase in CO emissions due to the intoduction of the WLTP was 21% for passenger cars and 27% for vans. Also that diesel vehicles are impacted more than gasoline ones and that the impact on conventional hybrid vehicles is 27% and plug-in hybrid vehicles between 0% (in 2020) and 11% (in 2019). Models employed revealed that the increase in CO is mainly due to the higher test masses and more realistic road load coefficients of WLTP that result in higher cycle energy demands. Moreover, results confirmed that the impact of the WLTP's introduction is in line, both in terms of absolute increase and variability, with model-based predictions performed before fleet-wide data were made available.
一种新的车辆测试程序（世界轻型车辆测试程序，简称WLTP）于2017年在欧盟（EU）推行。为了研究其对不同车辆技术和类型的一氧化碳排放的实际影响，本研究分析了2019年和2020年在欧盟认证和注册的车辆数据。研究发现，平均而言，对于2020年销售的所有车辆，由于采用WLTP，乘用车的一氧化碳排放量增加了21%，厢式货车增加了27%。还发现柴油车受到的影响比汽油车更大，对传统混合动力汽车的影响为27%，插电式混合动力汽车的影响在0%（2020年）至11%（2019年）之间。所采用的模型显示，一氧化碳排放量的增加主要是由于WLTP更高的测试质量和更现实的道路负荷系数，这导致了更高的循环能量需求。此外，结果证实，就绝对增加量和变异性而言，WLTP推行的影响与在全车队数据可用之前进行的基于模型的预测一致。
