Improvement of Repeatability in Tailpipe Emission Measurement with Direct Injection Spark Ignition (DISI) Vehicles

Sougawa, Yasunori; Koseki, Keiichi; Kawaguchi, Hiroshi; Nishimura, Junichi; Namiyama, Kazuyoshi; Yamagishi, Yutaka; Ogawa, Yasuhiro

doi:10.4271/2002-01-2710

Cited by 6 publications

(3 citation statements)

References 10 publications

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“…These results compared favorably with those presented by Vallaude et al [15]. Sougawa [17] evaluated the differences in repeatability of NOx measurements for DISI compared with PFI engines and showed differences in variation of 38% for DISI and above 18% for PFI.…”

Section: Figure 3 Uncertainty Associated With Measurement Of Pm Emiss...supporting

confidence: 82%

On the Validity of Steady-State Gasoline Engine Characterization Methodology for Generation of Optimal Calibrations Used in Real World Driving

Mason¹,

Winward²,

Yang³

et al. 2022

SAE Technical Paper Series

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Vehicle emissions and fuel economy in real-world driving conditions are currently under considerable scrutiny. Key to achieving optimum performance for a given hardware set and control scheme is a calibration that optimizes controller gains such that inputs are scheduled over the operating space to minimize emissions and maximize fuel economy. Generating a suitable calibration requires data that is both precise and accurate, this data is used to generate models that are deployed as part of the calibration optimization process. This paper evaluates the repeatability of typical steady-state measurements used for calibration of engine controllers that will ultimately determine vehicle level emissions for homologation include Real Driving Emissions (RDE).Stabilization requirements as indicated by three different measurements are evaluated and shown to be different within the same experiment, depending on the metric used. It is shown that this results in emissions and fuel economy measurements that differ, again for the same experiment, in both their mean value and variance. Differences between the measurement results are shown to be a consequence of the dynamics of the system and that the errors introduced by steady-state measurement are likely to be propagated through to the Response Surface Models used within the calibration optimization process. This discrepancy contributes to the differences between real-world and reported values for emissions and fuel economy.

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Section: Figure 3 Uncertainty Associated With Measurement Of Pm Emiss...supporting

confidence: 82%

On the Validity of Steady-State Gasoline Engine Characterization Methodology for Generation of Optimal Calibrations Used in Real World Driving

Mason¹,

Winward²,

Yang³

et al. 2022

SAE Technical Paper Series

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“…Cold-start emissions are known to contribute significantly to emissions 3 during vehicle drive-cycle testing [9,10]. There is considerable evidence to support the hypothesis that many short journeys generate considerably more pollution than one journey of the same distance [7].…”

Section: Introductionmentioning

confidence: 99%

“…The optimal conversion efficiency for a TWCC lies within a narrow band of AFRs around stoichiometry, known as the 'lambda window' [1]. Gasoline engines fitted with TWCs emit large quantities of CO and HC during the cold-start phase of engine operation as the conversion efficiency is low before the TWC has reached its light-off temperature [9,12]. Low engine temperatures may increase the likelihood of incomplete vaporisation of the fuel injected into the combustion chamber which can result in a lean vapour-phase mixture, slow burn rate and even misfiring [15].…”

Section: Introductionmentioning

confidence: 99%

The Effect of a Three-Way Catalytic Converter on Particulate Matter from a Gasoline Direct-Injection Engine During Cold-Start

Whelan¹,

Timoney²,

Smith³

et al. 2013

SAE Int. J. Engines

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The effect of a three-way catalytic converter on particulate matter from a gasoline direct-injection engine during cold-start. AbstractThis work investigates the effect of a three-way catalytic converter and sampling dilution ratio on nano-scale exhaust particulate matter emissions from a gasoline direct-injection engine during cold-start and warm-up transients. Experimental results are presented from a four cylinder in-line, four stroke, wall-guided direct-injection, turbo-charged and inter-cooled 1.6 l gasoline engine. A fast-response particulate spectrometer for exhaust nano-particle measurement up to 1000 nm was utilised. It was observed that the three-way catalytic converter had a significant effect on particle number density, reducing the total particle number by up to 65 % over the duration of the cold-start test. The greatest change in particle number density occurred for particles less than 23 nm diameter, with reductions of up to 95 % being observed, whilst the number density for particles above 50 nm diameter exhibited a significant increase. The exhaust temperature plays a significant role on the influence of the catalytic converter on the nano-scale particulate matter. It is evident that the dilution ratio of the exhaust sample has a distinct effect on the particulate matter number and size distribution, influencing the engine-out PM more significantly than the tailpipe-out PM during cold-start engine operation. The catalytic converter also has a considerable effect on the estimated total particle mass.

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Data handling and modeling

Martyr¹,

Rogers²

2021

Engine Testing

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Improvement of Repeatability in Tailpipe Emission Measurement with Direct Injection Spark Ignition (DISI) Vehicles

Cited by 6 publications

References 10 publications

On the Validity of Steady-State Gasoline Engine Characterization Methodology for Generation of Optimal Calibrations Used in Real World Driving

On the Validity of Steady-State Gasoline Engine Characterization Methodology for Generation of Optimal Calibrations Used in Real World Driving

The Effect of a Three-Way Catalytic Converter on Particulate Matter from a Gasoline Direct-Injection Engine During Cold-Start

Data handling and modeling

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