Measuring NOx during periodic technical inspection of diesel vehicles

IF 6 3区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Jacopo Franzetti, Tommaso Selleri, Natalia Fonseca González, Anastasios Melas, Roberto Gioria, Ricardo Suarez-Bertoa
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Abstract

Background

All light-duty (LD) and heavy-duty (HD) vehicles circulating in the European Union undergo regular checks during mandatory periodic technical inspections (PTI). These inspections promote road safety and environmental protection. Vehicles with defective deNOx aftertreatment systems can result in high emissions of NOx, which is an important air pollutant. The ongoing revision of the “so-called” Roadworthiness Package by the European Commission propose including a new method for measuring NOx from vehicles’ exhaust during PTI (NOx-PTI).

Results

The results obtained showed an increase in NOx emissions, 8 to 28 times, when the selective catalytic reduction (SCR) unit was not working. The applicability of the NOx-PTI idling test procedure to Euro VI HD vehicles was also investigated satisfactorily. Furthermore, methods to warm-up the vehicle’s aftertreatment prior to the NOx-PTI idling test, including standing still free accelerations and urban speed drives, as well as systems conditions before the test, were studied. Five different NOx analysers were assessed against reference equipment to ensure the accuracy of NOx measurements to assess their suitability for PTI purposes. The findings indicate that an urban speed drive is suitable for warming up both LD and HD vehicles. The tested analysers appeared to be suitable for use in PTI.

Conclusions

The high NOx emissions recorded when the SCR unit was not working, and their potential environmental impact, highlight the importance of a PTI test capable of detecting malfunctioning vehicles. The study demonstrated that the idle test procedure, testing conditions, and NOx analysers used were effective in performing a NOx-PTI check on both light- and heavy-duty Diesel vehicles, successfully discriminating between functioning and malfunctioning SCR systems.

在柴油车辆定期技术检查期间测量氮氧化物
背景在欧盟流通的所有轻型(LD)和重型(HD)车辆都要在强制性定期技术检查(PTI)期间接受定期检查。这些检查促进了道路安全和环境保护。脱硝后处理系统有缺陷的车辆会导致氮氧化物的高排放,而氮氧化物是一种重要的空气污染物。欧盟委员会正在对 "所谓 "的 "适路性一揽子方案 "进行修订,建议在 PTI(NOx-PTI)过程中采用一种新方法来测量汽车尾气中的氮氧化物。氮氧化物-怠速空转测试程序对欧 VI HD 车辆的适用性研究也令人满意。此外,还研究了氮氧化物-PTI 空转测试前车辆后处理的预热方法,包括静止自由加速和城市高速行驶,以及测试前的系统条件。对照参考设备对五种不同的氮氧化物分析仪进行了评估,以确保氮氧化物测量的准确性,从而评估其是否适用于 PTI 目的。研究结果表明,城市高速驱动器适用于为低速和高速车辆预热。结论当选择性催化还原装置不工作时记录到的高氮氧化物排放量及其对环境的潜在影响,突出了能够检测故障车辆的 PTI 测试的重要性。该研究表明,所使用的怠速测试程序、测试条件和氮氧化物分析仪可有效地对轻型和重型柴油车辆进行氮氧化物-PTI 检查,并成功区分出 SCR 系统的功能和故障。
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来源期刊
Environmental Sciences Europe
Environmental Sciences Europe Environmental Science-Pollution
CiteScore
11.20
自引率
1.70%
发文量
110
审稿时长
13 weeks
期刊介绍: ESEU is an international journal, focusing primarily on Europe, with a broad scope covering all aspects of environmental sciences, including the main topic regulation. ESEU will discuss the entanglement between environmental sciences and regulation because, in recent years, there have been misunderstandings and even disagreement between stakeholders in these two areas. ESEU will help to improve the comprehension of issues between environmental sciences and regulation. ESEU will be an outlet from the German-speaking (DACH) countries to Europe and an inlet from Europe to the DACH countries regarding environmental sciences and regulation. Moreover, ESEU will facilitate the exchange of ideas and interaction between Europe and the DACH countries regarding environmental regulatory issues. Although Europe is at the center of ESEU, the journal will not exclude the rest of the world, because regulatory issues pertaining to environmental sciences can be fully seen only from a global perspective.
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