On-road CO2 and NOx emissions of a diesel vehicle in urban traffic

Shahariar, G. M. Hasan; Sajjad, Mojibul; Suara, Kabir Adewale; Jahirul, M.I.; Van, Thuy Chu; Ristovski, Zoran; Brown, Richard J.; Bodisco, Timothy A.

doi:10.1016/j.trd.2022.103326

Cited by 17 publications

(8 citation statements)

References 35 publications

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“…It reduced delays and generated the least amount of polluting emissions compared to the current situation. It is worth noting that the driving behavior of road users, influenced by both internal and external factors affecting traffic flows, significantly impacts vehicle emissions even within a simulation environment [61,62]. Pollutant emissions tend to increase with higher average vehicle speeds and during sudden acceleration or deceleration maneuvers [63].…”

Section: Discussionmentioning

confidence: 99%

Evaluating Traffic-Calming-Based Urban Road Design Solutions Featuring Cooperative Driving Technologies in Energy Efficiency Transition for Smart Cities

Tumminello,

Macioszek,

Granà

et al. 2023

Energies

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Traffic-calming measures (TCMs) are non-invasive devices designed to improve road mobility and urban areas on a human scale. Despite their potential, they have been in use for a long time and now have to deal with the latest technological innovations in the automotive field, such as cooperative driving technologies (CDTs), to improve energy efficiency in cities. The goal of this study is to explore the safety and operational performances of TCMs featuring CDTs in urban areas. An urban-scale road network close to a seaside area in the City of Mazara del Vallo, Italy, was properly redesigned and simulated in AIMSUN to assess several design solutions, where connected and automated vehicles (CAVs) have been employed as a more energy-efficient public transportation system. Preliminarily, the fine-tuning process of model parameters included CAVs and human-operated vehicles (HOVs) flowing through the network up to saturation conditions. The safety of the planned solutions was tested by using surrogate measures. The micro-simulation approach allowed us to know in advance and compare the operational and safety performances of environmentally friendly solutions involving TCMs and CDTs. These results can also support urban road decision makers in pivoting urban-traffic-calming-based design solutions featuring cooperative driving technologies toward energy efficiency transitions for smart cities.

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Section: Discussionmentioning

confidence: 99%

Evaluating Traffic-Calming-Based Urban Road Design Solutions Featuring Cooperative Driving Technologies in Energy Efficiency Transition for Smart Cities

Tumminello,

Macioszek,

Granà

et al. 2023

Energies

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“…The monitoring of carbon monoxide (CO) and carbon dioxide (CO 2 ) in car exhaust emissions plays a crucial role in regulating air quality and ensuring adherence to environmental standards [1] [2]. Monitoring is also important for health reasons since vehicle emissions result in environmental pollution causing cardiovascular and lung diseases [3] [4] [5] [6] [7].…”

Section: Introductionmentioning

confidence: 99%

Calibration of CO and CO<sub>2</sub> Monitors Used in Periodic Inspection of Vehicles at Fixed Stations for Environmental Control

Shehata,

Askar,

Yami

et al. 2024

GSC

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Global efforts for environmental cleanliness through the control of gaseous emissions from vehicles are gaining momentum and attracting increasing attention. Calibration plays a crucial role in these efforts by ensuring the quantitative assessment of emissions for informed decisions on environmental treatments. This paper describes a method for the calibration of CO/CO 2 monitors used for periodic inspections of vehicles in cites. The calibration was performed in the selected ranges: 900 -12,000 µmol/mol for CO and 2000 -20,000 µmol/mol for CO 2 . The traceability of the measurement results to the SI units was ensured by using certified reference materials from CO/N 2 and CO 2 /N 2 primary gas mixtures. The method performance was evaluated by assessing its linearity, accuracy, precision, bias, and uncertainty of the calibration results. The calibration data exhibited a strong linear trend with R² values close to 1, indicating an excellent fit between the measured values and the calibration lines. Precision, expressed as relative standard deviation (%RSD), ranged from 0.48 to 4.56% for CO and from 0.97 to 3.53% for CO 2 , staying well below the 5% threshold for reporting results at a 95% confidence level. Accuracy measured as percent recovery, was consistently high (≥ 99.1%) for CO and ranged from 84.90% to 101.54% across the calibration range for CO 2 . In addition, the method exhibited minimal bias for both CO and CO 2 calibrations and thus provided a reliable and accurate approach for calibrating CO/CO 2 monitors used in vehicle inspections. Thus, it ensures the effectiveness of exhaust emission control for better environment.

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“…The introduction of Real Driving Emissions (RDE) testing and the Worldwide harmonized Light vehicles Test Cycles (WLTC) within the Worldwide harmonized Light vehicles Test Procedure (WLTP) framework aims to narrow the gap between homologation and real-world emissions of Internal Combustion Engines (ICE) [2]. However, research indicates that vehicles meeting current standards still emit significant pollutants under specific conditions, such as cold starts [3], short trips [4], and scenarios involving high altitudes [5] or extreme ambient temperatures [6]. Current RDE tests establish environmental limits to assess vehicle emissions control in real-world driving scenarios [7].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Altitude and Ambient Temperature Effects on the Reactivity of Oxidation Catalysts in the Presence of H2

Serrano,

Piqueras,

Sanchis

et al. 2024

Preprint

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Worldwide emission standards are now required to cover engine operation under extreme ambient conditions, which affect the raw emissions and the efficiency of the exhaust aftertreatment systems. These regulations also target new combustion technologies for decarbonization, such as neat hydrogen (H2) combustion or dual-fuel strategies, which involve a challenge to the analysis of exhaust aftertreatment systems requirements and performance. This work addresses the impact of high altitude and low ambient temperature conditions on the reactivity of an oxidation catalyst in the presence of H2. A reaction mechanism is proposed to cover the main conversion paths of CO, HC, and H2, including the formation and consumption of high-energy surface reaction intermediates. The mechanism has been implemented into a faster-than-real-time reduced-order model for multi-layer washcoat honeycomb catalytic converters. The model was utilized to investigate the effect of H2 concentration on the reactivity of CO and HC within the catalyst under various operating and ambient conditions. By applying the model and examining the selectivity towards different reaction pathways in the presence H2, insights into surface intermediates and reactivity across different cross-sections of the monolith were obtained. This analysis discusses the underlying causes of reactivity changes promoted by H2 and its relative importance as a function of driving boundary conditions.

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On-road CO2 and NOx emissions of a diesel vehicle in urban traffic

Cited by 17 publications

References 35 publications

Evaluating Traffic-Calming-Based Urban Road Design Solutions Featuring Cooperative Driving Technologies in Energy Efficiency Transition for Smart Cities

Evaluating Traffic-Calming-Based Urban Road Design Solutions Featuring Cooperative Driving Technologies in Energy Efficiency Transition for Smart Cities

Calibration of CO and CO<sub>2</sub> Monitors Used in Periodic Inspection of Vehicles at Fixed Stations for Environmental Control

Analysis of Altitude and Ambient Temperature Effects on the Reactivity of Oxidation Catalysts in the Presence of H2

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On-road CO2 and NOx emissions of a diesel vehicle in urban traffic

Cited by 17 publications

References 35 publications

Evaluating Traffic-Calming-Based Urban Road Design Solutions Featuring Cooperative Driving Technologies in Energy Efficiency Transition for Smart Cities

Evaluating Traffic-Calming-Based Urban Road Design Solutions Featuring Cooperative Driving Technologies in Energy Efficiency Transition for Smart Cities

Calibration of CO and CO&lt;sub&gt;2&lt;/sub&gt; Monitors Used in Periodic Inspection of Vehicles at Fixed Stations for Environmental Control

Analysis of Altitude and Ambient Temperature Effects on the Reactivity of Oxidation Catalysts in the Presence of H2

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Calibration of CO and CO<sub>2</sub> Monitors Used in Periodic Inspection of Vehicles at Fixed Stations for Environmental Control