Study on Real-World NOx and Particle Emissions of Bus: Influences of VSP and Fuel

Ren, Yedi; Lou, Diming; Zhang, Yunhua; Tan, Piqiang; Hu, Zhiyuan

doi:10.4271/2019-01-1181

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…Chinese Research Academy of Environmental Sciences (CRAES) [22][23][24] carried out the PEMS test for the real-world emissions performance of light-and heavy-duty vehicles. Research workers from other research institutes, [25][26][27][28] such as Beijing Institute of Technology (BIT), Tongji University, etc., have studied real-world emissions from various vehicle using kinds of PEMS for diverse purpose. These studies indeed benefit the understanding of China's on-road emissions and greatly support the management and regulation of vehicle emissions.…”

Section: Introductionmentioning

confidence: 99%

Investigation of real-world emissions of China III and China IV buses in a high-altitude city: A case study of Lhasa

Lyu

Lyu³

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part D:

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Limitations still remain among vehicle emissions standards and regulations about high-altitude areas at altitude over 2400 m. In view of high vehicle-use intensity for buses, on-road measurements were performed on four heavy-duty diesel vehicles by employing a portable emissions measurement system (PEMS) in Lhasa, with an average elevation of approximately 3650 m. The result indicated that under real-world driving conditions of Lhasa, compared with China III buses, China IV buses did not show excellent emission performance consistently. For example, carbon monoxide (CO) emission factor of China III-5.2L buses is 2.4 times of China IV-5.2L buses, while the nitrogen oxides (NOx) is only 36% of China IV-5.2L. Furthermore, an operating mode binning and a micro-trips method are used to link real-world emissions of each vehicle to driving conditions. For China III-5.2L and China IV-5.2L buses, we found strong correlations between relative emission factors of carbon dioxide (CO2) and NOx and average speed. However, these correlations for China IV-7.8L bus were less strong. This phenomenon proves that the role of traffic conditions in affecting road driving emissions would be mitigated when selective catalytic reduction (SCR) functioning properly. This study have potential implications for policymakers concerning vehicle emissions management and control strategies, such as promotion of alternative fuel with in-used buses, aimed at emissions reduction.

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Section: Introductionmentioning

confidence: 99%

Investigation of real-world emissions of China III and China IV buses in a high-altitude city: A case study of Lhasa

Lyu

Lyu³

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

State-of-the-Art of Establishing Test Procedures for Real Driving Gaseous Emissions from Light- and Heavy-Duty Vehicles

et al. 2021

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Air pollution caused by vehicle emissions has raised serious public health concerns. Vehicle emissions generally depend on many factors, such as the nature of the vehicle, driving style, traffic conditions, emission control technologies, and operational conditions. Concerns about the certification cycles used by various regulatory authorities are growing due to the difference in emission during certification procedure and Real Driving Emissions (RDE). Under laboratory conditions, certification tests are performed in a ‘chassis dynamometer’ for light-duty vehicles (LDVs) and an ‘engine dynamometer’ for heavy-duty vehicles (HDVs). As a result, the test drive cycles used to measure the automotive emissions do not correctly reflect the vehicle’s real-world driving pattern. Consequently, the RDE regulation is being phased in to reduce the disparity between type approval and vehicle’s real-world emissions. According to this review, different variables such as traffic signals, driving dynamics, congestions, altitude, ambient temperature, and so on have a major influence on actual driving pollution. Aside from that, cold-start and hot-start have been shown to have an effect on on-road pollution. Contrary to common opinion, new technology such as start-stop systems boost automotive emissions rather than decreasing them owing to unfavourable conditions from the point of view of exhaust emissions and exhaust after-treatment systems. In addition, the driving dynamics are not represented in the current laboratory-based test procedures. As a result, it is critical to establish an on-road testing protocol to obtain a true representation of vehicular emissions and reduce emissions to a standard level. The incorporation of RDE clauses into certification procedures would have a positive impact on global air quality.

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Study on Real-World NOx and Particle Emissions of Bus: Influences of VSP and Fuel

Cited by 2 publications

References 12 publications

Investigation of real-world emissions of China III and China IV buses in a high-altitude city: A case study of Lhasa

Investigation of real-world emissions of China III and China IV buses in a high-altitude city: A case study of Lhasa

State-of-the-Art of Establishing Test Procedures for Real Driving Gaseous Emissions from Light- and Heavy-Duty Vehicles

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