Effects of EGR Dilution and Fuels on Spark Plug Temperatures in Gasoline Engines

Gukelberger, Raphael; Alger, Terrence; Mangold, Barrett; Boehler, J. T.; Eiden, Corey

doi:10.4271/2013-01-1632

Cited by 7 publications

(2 citation statements)

References 27 publications

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“…The effect of dilution on ethanol and methanol fueled engines and knocking behavior is captured by few studies. Gukelberger et al 43 and Kaiser et al 44 observed a marginal efficiency improvement for E85 with EGR but not as much as gasoline since E85 was already close to optimal phasing. In these cases, the potential for improvement was limited by hardware used, that is, boost pressure or peak pressure limitation.…”

Section: Introductionmentioning

confidence: 97%

Alcohol lean burn in heavy duty engines: Achieving 25 bar IMEP with high efficiency in spark ignited operation

Mahendar

Larsson

Erlandsson

2020

International Journal of Engine Research

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Knock is the most crucial limitation in attaining the peak load required at high efficiency in heavy duty (HD) spark ignition (SI) engines. Renewable fuels such as ethanol and methanol have high resistance to autoignition and can help overcome this limitation. To reduce knock and improve efficiency further, dilution can be used to add specific heat capacity and reduce combustion temperature. This work studied diluted combustion and knock characteristics of gasoline, ethanol, and methanol on a HD SI single cylinder engine for a wide load range. Ethanol and methanol displayed excellent knock resistance which allowed a peak gross IMEP of 25.1 and 26.8 bar respectively, compared to gasoline which only reached 8.3 bar at [Formula: see text]1.4 with a compression ratio of 13. Over 18% increase in gross IMEP was possible for gasoline and ethanol when increasing air excess ratio from 1 to 1.4. Methanol achieved the target gross IMEP at [Formula: see text]1 and required no spark retard at [Formula: see text]1.6. A peak indicated efficiency above 48% was recorded for ethanol and methanol at [Formula: see text]1.6 and gross IMEP of approximately 21 bar. At part loads, stable operation was possible until [Formula: see text]1.8 for all fuels. Increase in intake temperature showed a marginal improvement in stability but no increase in lean limit. The concept shows promise as diluted combustion of ethanol and methanol reduced knock and achieved diesel baseline load. With optimization, there is potential to improve efficiency further and possible cost savings compared to commercial diesel engines.

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Section: Introductionmentioning

confidence: 97%

Alcohol lean burn in heavy duty engines: Achieving 25 bar IMEP with high efficiency in spark ignited operation

Mahendar

Larsson

Erlandsson

2020

International Journal of Engine Research

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“…Other more specific studies have been performed by Bourhis et al [15] analyzing the compromise between cooled EGR and IGR in a GDI engine, showing that the IGR must be reduced as much as possible in order to maximize the cooled EGR effects: a reduction in fuel consumption and in knocking tendency, at partial and high loads. Gukelberger et al [16] investigated the EGR dilution and fuel's effects on the spark plug temperature. They found that at partial load conditions the spark plug temperature was reduced by the introduction of cooled EGR but at high load conditions the spark plug temperature increased due to the better combustion phasing and the elimination of the fuel enrichment.…”

Section: Introductionmentioning

confidence: 99%

Influence of a low pressure EGR loop on a gasoline turbocharged direct injection engine

Luján

Climent

Novella

et al. 2015

Applied Thermal Engineering

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This paper presents an experimental study of a low pressure EGR loop on a spark ignition (SI) Gasoline Turbocharged Direct Injection (GTDI) engine that will improve the understanding on the advantages and disadvantages of this strategy. Two steady engine operating conditions were investigated, 10 bar and 17 bar at 2000 rpm. At partial load conditions a combustion, performance, air management and exhaust gas emissions study was performed in order to analyses the EGR effect on the GTDI engine. The main advantages found were the reduction in fuel consumption due to the better combustion phasing, and the reduction in pumping losses and heat losses through the cylinder walls. A reduction on NOx, CO and soot was also observed when introducing EGR at these operating conditions. The main disadvantage found was the water condensation after the intercooler. At high load conditions similar analysis and conclusions to the partial load conditions are obtained. The EGR also allowed the combustion to be phased in a more efficient angle by reducing the risk of knocking, which helped reduce the exhaust gas temperature, despite the elimination of the fuel enrichment strategy. A reduction on CO and soot raw emissions was also observed when introducing EGR, as observed at partial load conditions, but a high reduction in NOx, CO, HC and soot emissions was observed after the catalyst since the fuel enrichment strategy is eliminated when cooled EGR is introduced. The main disadvantage found was the turbocharger limitation since higher compression ratio is required in order to keep the same air mass flow as the reference conditions without EGR. The original turbocharger is not designed to provide this higher compression ratio at low engine speed and high load. Results confirm how introducing EGR is a suitable strategy to control knocking and reduce simultaneously exhaust gas temperature and fuel consumption, but the disadvantages found in this investigation must be solved to assure its feasibility as a powerful technology to be implemented in future SI engines.

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Impact of Operating Parameters on Ignition System Energy Consumption

Gukelberger¹,

Alger²,

Gingrich³

et al. 2014

SAE Technical Paper Series

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Effects of EGR Dilution and Fuels on Spark Plug Temperatures in Gasoline Engines

Cited by 7 publications

References 27 publications

Alcohol lean burn in heavy duty engines: Achieving 25 bar IMEP with high efficiency in spark ignited operation

Alcohol lean burn in heavy duty engines: Achieving 25 bar IMEP with high efficiency in spark ignited operation

Influence of a low pressure EGR loop on a gasoline turbocharged direct injection engine

Impact of Operating Parameters on Ignition System Energy Consumption

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