Comprehensive Diagnostic Methodology

Chamarthi, Gopal K.; Sarkar, Andrew; Baltusis, Paul; Laleman, Mark

doi:10.4271/2017-01-1685

Cited by 6 publications

(4 citation statements)

References 2 publications

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“…However, the cost of emission test equipment is high, the test operation is complex and time-consuming, and it is unsuitable to measure a large number of vehicles in a short time. Meanwhile, on-board diagnostics (OBD) emerged with the development of vehicle electronic control technology and can monitor vehicle emissions with good economic benefits and cost advantages [26,27]. For heavy-duty diesel vehicles in China, remote OBD is required to monitor vehicle emissions during real-road driving.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Heavy-Duty Diesel Vehicle NOx and CO2 Emissions Based on OBD Data

Hao,

Ren,

et al. 2023

Atmosphere

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Controlling NOx and CO2 emissions from heavy-duty diesel vehicles (HDDVs) is receiving increasing attention. Accurate measurement of HDDV NOx and CO2 emissions is the prerequisite for HDDV emission control. Vehicle emission regulations srecommend the measurement of NOx and CO2 emissions from vehicles using an emission analyzer, which is expensive and unsuitable to measure a large number of vehicles in a short time. The on-board diagnostics (OBD) data stream of HDDVs provides great convenience for calculating vehicle NOx and CO2 emissions by providing the engine fuel flow rate, NOx sensor output, and air mass flow. The calculated vehicle NOx and CO2 emissions based on the OBD data were validated by testing a heavy-duty truck’s emissions on the chassis dynamometer over the CHTC-HT driving cycle, showing that the calculated NOx and CO2 emissions based on the OBD data are consistent with the measured results by the emission analyzer. The calculated vehicle fuel consumptions based on the OBD data were close to the calculated results based on the carbon balance method and the measured results by the fuel flowmeter. The experimental results show that accessing vehicle NOx and CO2 emissions based on the OBD data is a convenient and applicable method.

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Section: Introductionmentioning

confidence: 99%

Assessment of Heavy-Duty Diesel Vehicle NOx and CO2 Emissions Based on OBD Data

Hao,

Ren,

et al. 2023

Atmosphere

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“…At present, OBD can effectively monitor vehicle emission performance, has good economic benefits and cost advantages. 14,15 However, in the short or medium term, OBD cannot replace the vehicle I/M method, because older vehicles are not equipped with OBD systems. The vehicle I/M programs can effectively detect the emissions of in-use vehicles and screen out high-emission vehicles.…”

Section: Introductionmentioning

confidence: 99%

A multi-pronged approach to strengthen diesel vehicle emission monitoring

Hao

Yin

Wang

et al. 2022

Environ. Sci.: Adv.

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“…On-board Diagnostics (OBD) is a convenient and cost-effective means to monitor vehicle emissions [8,9]. When the vehicle has a failure exceeding the emission standard, the OBD malfunction light will illuminate to warn the driver to repair the vehicle.…”

Section: Introductionmentioning

confidence: 99%

Research on Analysis Method of Remote Sensing Results of NO Emission from Diesel Vehicles

et al. 2022

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Remote sensing technology has been used for gasoline vehicle gaseous emissions monitoring for nearly 30 years. However, the application effect of the remote sensing detection of diesel vehicle tailpipe emission concentrations is unsatisfactory. Therefore, several approaches were proposed to analyze the remote sensing results for gaseous exhaust emissions from diesel vehicles, including the concentration ratios of gaseous emission components to carbon dioxide (CO2) and fuel-based emission factors. Based on our experimental results, these two metrics have some high values in low-speed or low-load conditions of vehicles, which introduces uncertainty when evaluating vehicle emission levels. Therefore, an inversion calculation method originally developed for remote sensing light duty diesel vehicle gaseous emissions was used for the remote sensing of nitrogen monoxide (NO) tailpipe concentrations in heavy duty diesel vehicles, and validated by PEMS tested emission results. For the first time, the above three options for evaluating the NOx emission level of diesel vehicles, including the concentration ratio of NO to CO2, the fuel-based NO emission factor and the estimated tailpipe NO emission concentration were investigated, and some influencing factors were also discussed. The remote sensing tailpipe NO emission concentration can be directly used to evaluate diesel vehicle NO emission levels compared with the two other metrics.

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Comprehensive Diagnostic Methodology

Cited by 6 publications

References 2 publications

Assessment of Heavy-Duty Diesel Vehicle NOx and CO2 Emissions Based on OBD Data

Assessment of Heavy-Duty Diesel Vehicle NOx and CO2 Emissions Based on OBD Data

A multi-pronged approach to strengthen diesel vehicle emission monitoring

Research on Analysis Method of Remote Sensing Results of NO Emission from Diesel Vehicles

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