2021
DOI: 10.1016/j.atmosenv.2020.117878
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Influence of exhaust gas temperature and air-fuel ratio on NOx aftertreatment performance of five large passenger cars

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Cited by 40 publications
(11 citation statements)
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“…However, vehicle emissions are an issue, and authorities and decision-makers have been limiting emissions by tightening the permissible emission thresholds in the regulations (such as Euro1-6). This research shows that when it comes to NOx emissions, the current increasing share of biofuels can have more adverse effects, especially during cold-operation-which is a part of the daily driving norm for many vehicles in cities-where the after-treatment systems are not welleffective [28]. Emissions from the cold-start period are important as this period is within the first 5 min of starting a vehicle, during which time many vehicles are still near urban areas [38].…”
Section: Practical Implications Of This Study and Limitationsmentioning
confidence: 95%
See 1 more Smart Citation
“…However, vehicle emissions are an issue, and authorities and decision-makers have been limiting emissions by tightening the permissible emission thresholds in the regulations (such as Euro1-6). This research shows that when it comes to NOx emissions, the current increasing share of biofuels can have more adverse effects, especially during cold-operation-which is a part of the daily driving norm for many vehicles in cities-where the after-treatment systems are not welleffective [28]. Emissions from the cold-start period are important as this period is within the first 5 min of starting a vehicle, during which time many vehicles are still near urban areas [38].…”
Section: Practical Implications Of This Study and Limitationsmentioning
confidence: 95%
“…They also studied the effect of exhaust temperature on NOx control techniques, reporting that the performance of after-treatment systems depends on the engine operating condition, as well as the state. A study by Mera et al [28] used a modern SUV diesel vehicle equipped with SCR and reported that during cold-start, NOx emissions were 2.7 times higher than the Euro 6 NOx emission limits, while with the warmed-up engine, cold-start emissions decreased by 92%. During coldstart operation, after-treatment systems are known to be not well-effective and emissions are largely untreated within this period.…”
Section: Introductionmentioning
confidence: 99%
“…In order to effectively utilize the CART unit, the EGT entering the DOC and DPF has to be maintained above 300°C to ensure complete oxidation of greenhouse gases and particulate smoke particles (Mera et al 2021). Hence, the required EGT is obtained by optimizing the PIT and PIM at various loads while operating on CP20D80, AA20D80 and diesel fuel.…”
Section: Behavior Of Egt Across the Cart Unit While Operating On Micr...mentioning
confidence: 99%
“…22 RDE test cycle in this paper was mainly obtained from a specific cycle performed on road, 23 but it had to be slightly modified to fulfill with the newest regulation. After that, conditions of the cycle have been reproduced in a test bench to eliminate the variations that many parameters as the weather, ambient pressure, 24,25 traffic, driver behavior that produces different dynamic solicitations, 26 road grade, 27 aftertreatment status or vehicle mileage can produce [28][29][30][31][32][33][34] as well as other issues that can appear which can spoil the test like DPF regeneration, traffic jams, etc. For example, different on road cycles that follow the same route, can have a high NOx emission dispersion, 35 and it is likely to find emissions differences of up to 24%.…”
Section: Wltc and Rdementioning
confidence: 99%