Implications of Engine Start-Stop on After-Treatment Operation

Koltsakis, G. C.; Samaras, Zissis; Karvountzis-Kontakiotis, Apostolos; Zacharopoulou, Theodora; Haralampous, O. A.

doi:10.4271/2011-01-1243

Cited by 16 publications

(8 citation statements)

References 14 publications

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“…These include early exhaust valve opening (EEVO), internal EGR (iEGR), and start-stop systems. 7–9 Another of these technologies, and the focus of this article, is CDA. Conventional diesel engines operate lean, and the highest air-fuel ratios (AFR) are generally found at low loads where the engine pumps a large amount of excess air that reduces exhaust temperatures and increases pumping work.…”

Section: Introductionmentioning

confidence: 99%

Experimental assessment of diesel engine cylinder deactivation performance during low-load transient operations

Allen

Joshi

Gosala

et al. 2019

International Journal of Engine Research

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Fuel-efficient aftertreatment thermal management in modern diesel engines is a difficult challenge, especially during low-load operation. This study explores the performance of cylinder deactivation in a diesel engine during low-load operation following highway cruise through experimental evaluation of two drive cycles, specifically extended idle and repeated heavy heavy-duty diesel truck creep cycles. Cylinder deactivation operations are shown to maintain comparable aftertreatment thermal management performance to conventional thermal management operation while reducing fuel up to 40% during extended idle operation. This fuel efficiency improvement coincides with engine-out emission reductions of 72% for soot and 52% for NOx. Cylinder deactivation also shows improved thermal management compared to a more fuel-efficient conventional operation.

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Section: Introductionmentioning

confidence: 99%

Experimental assessment of diesel engine cylinder deactivation performance during low-load transient operations

Allen

Joshi

Gosala

et al. 2019

International Journal of Engine Research

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“…Gasoline engine technology has entered one of the most exciting periods in its long history: downsizing, hybridization and stricter emission standards determine the future of SI engines [1]. Advanced engine requirements for high power density and low fuel consumption can be achieved through high boost, direct injection, engine start&stop [2] and lean burn operation.…”

Section: Introductionmentioning

confidence: 99%

Study on pollutants formation under knocking combustion conditions using an optical single cylinder SI research engine

Karvountzis-Kontakiotis

Vafamehr

Cairns

et al. 2018

Energy

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“…Other research fronts for the stop-start system include the impact of engine stop-start events on exhaust after-treatment. In frequent engine stop events, the exhaust gas temperature may not be sufficiently high for catalyst light-off, hence the efficacy of the after-treatment system is compromised [13].…”

Section: Introductionmentioning

confidence: 99%

Benefits of spark-ignition engine fuel-saving technolog

Salim¹,

Mahdi²,

Ismail³

et al. 2017

J. MECH. ENG. SCI.

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This paper presents a simulation-based study to evaluate three potential benefits of fuelsaving technologies implemented in spark-ignition (SI) engines for a passenger car over actual urban driving cycles. These technologies include cylinder deactivation (CDA), stop-start system, and engine downsizing (≈20% degree of downsizing). The aim of the work is to evaluate individual benefits of each system in terms of fuel consumption. GT-Power engine simulation tool is utilised to model engines which employ each of the mentioned technologies; each of the engines has identical full-load torque characteristics. Each engine model is instructed to run over a transient, part-load, torque driven operations based on actual road test measurements, and the cycle-averaged fuel consumption was evaluated. From the analysis, the contribution of each technology in terms of fuel economy can be assessed based on an actual part-load transient operation, which can be beneficial to developers to optimise the operation of SI engines. The results revealed stopstart system to be the most promising technology for the driving cycle at hand with 27.5% fuel consumption improvement over the baseline engine. CDA engine allows for 12.6% fuel economy improvement. On the other hand, the downsized turbocharged engine has caused increasing cycle fuel consumption by 7.5%. These findings are expected to be valid for typical urban driving cycles as far as they conform to the operating load residency points over the transient torque profile.

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Implications of Engine Start-Stop on After-Treatment Operation

Cited by 16 publications

References 14 publications

Experimental assessment of diesel engine cylinder deactivation performance during low-load transient operations

Experimental assessment of diesel engine cylinder deactivation performance during low-load transient operations

Study on pollutants formation under knocking combustion conditions using an optical single cylinder SI research engine

Benefits of spark-ignition engine fuel-saving technolog

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