NOx emission deterioration in modern heavy-duty diesel vehicles based on long-term real driving measurements

Lyu, Liqun; Ji, Zhongrui; Yin, Hong; Wang, Junfang; Yang, Wenjuan; Tan, Jianwei; Hao, Lijun; Wang, Xin; Wang, Huaiyu; Ge, Yunshan; Wang, Yachao

doi:10.1016/j.envres.2023.116396

Cited by 10 publications

(1 citation statement)

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“…Based on the actual driving characteristics of vehicles, the study recommended the development of control methods for NOx emissions specifically targeted at low load conditions. Lyu et al [14] conducted real-world road emission tests on China's National VI heavy-duty diesel vehicles using Portable Emission Measurement Systems (PEMS) and analyzed the NOx emission characteristics using the power-based window method. The results revealed significant uncertainty in NOx emissions during actual driving processes.…”

Section: Introductionmentioning

confidence: 99%

A study on the relationship between vehicle operating conditions and NOx emission characteristics

Xia,

Wang,

Feng

et al. 2024

E3S Web Conf.

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To address the challenges faced by vehicles during actual operation when passing through traffic lights or intersections, where rapid changes in operating conditions can lead to a decrease in SCR efficiency and an increase in NOx emissions, this study focuses on defining characteristic position scenarios and analyzing the NOx emission characteristics of vehicles when passing through these scenarios based on real-time vehicle conditions. Through the analysis of several specific events, several road condition factors and driver behavior factors that may contribute to increased NOx emissions at characteristic position scenarios are identified. The findings indicate that when vehicles pass through traffic lights and intersections, the main causes of increased NOx emissions are low SCR temperature resulting from prolonged idling or engine shutdown, and high exhaust NOx emissions resulting from sudden excessive fuel injection. The driver behaviors associated with these situations primarily include coasting when approaching intersections, frequent stop-start behaviour due to traffic congestion or road crowding, choosing to shut off the engine for fuel efficiency during prolonged traffic congestion, and aggressive acceleration by stepping on the accelerator when the green light is about to turn red.

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Section: Introductionmentioning

confidence: 99%