Effects of Multiple Injections and Flexible Control of Boost and EGR on Emissions and Fuel Consumption of a Heavy-Duty Diesel Engine

Montgomery, David T.; Reitz, Rolf D.

doi:10.4271/2001-01-0195

Cited by 82 publications

(47 citation statements)

References 19 publications

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“…Furthermore, the potential for further reduction of exhaust emissions using EGR has been extensively investigated. Montgomery and Reitz [37] studied the effect of EGR in a heavy duty diesel engine using 50%/50%, 55%/45% and 70%/30% split injection strategies with EGR levels varying between 10% to 25%. Their investigation revealed the potential for simultaneous reduction of NOx and soot emissions using split injection with EGR.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of hydraulic effects of two-stage fuel injection on fuel-injection systems and diesel combustion in a high-speed optical common-rail diesel engine

Herfatmanesh

Zhao

2012

International Journal of Engine Research

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The final, definitive version of this paper has been published in International Journal of Engine Research, Vol 15 Issue 1, September 2012, ppublished by SAGE Publishing, All rights reserved.In order to meet the ever more stringent emission standards, significant efforts have been devoted to the research and development of internal combustion engines. The requirements for more efficient and responsive diesel engines have led to the introduction and implementation of multiple injection strategies. However, the effects of such injection modes on the hydraulic systems, such as the high-pressure pipes and fuel injectors, must be thoroughly examined and compensated for since the combustion and the formation of pollutants in direct-injection engines are directly influenced by the spatial and temporal distribution of the injected fuel within the combustion chamber. This study investigated the hydraulic effects of two-stage fuel injection on diesel combustion and emissions. The fuel-injection system was characterised for all the tested strategies through the measurement of the fuel-injection rate and quantity. In particular, the interaction between the two injection events was identified. The effects of two-stage injection, dwell angle and the interactions between two consecutive injection events on the combustion process and the emissions were investigated in a high-speed direct-injection single-cylinder optical diesel engine using heat-release analysis and high-speed fuel spray and combustion visualisation techniques. The results indicated that the two-stage injection strategy has the potential for simultaneous reduction of nitrogen oxide, soot and unburned hydrocarbon emissions. The results suggested that an optimum fuel quantity in the first injection exists, 0???30%, with which simultaneous reduction of nitrogen oxide, soot and unburned hydrocarbon emissions can be achieved with the added benefits of improved engine performance, fuel economy and combustion noise. However, higher soot emissions were produced, mainly due to the interaction between the two consecutive fuel-injection events whereby the fuel sprays during the second injection were injected into burning regions, as well as reduced soot oxidation due to the continuation of the combustion into the expansion stroke

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of hydraulic effects of two-stage fuel injection on fuel-injection systems and diesel combustion in a high-speed optical common-rail diesel engine

Herfatmanesh

Zhao

2012

International Journal of Engine Research

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“…This was mainly because the post injection increased the combustion temperature during the diffusion phase and enhanced soot oxidation. In addition, recent studies have explored the combination of different factors such as split injection with EGR [10,11]. Montgomery and Reitz [10] investigated split injection in a conventional heavy duty diesel engine with EGR levels between 10 to 25%.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, recent studies have explored the combination of different factors such as split injection with EGR [10,11]. Montgomery and Reitz [10] investigated split injection in a conventional heavy duty diesel engine with EGR levels between 10 to 25%. Their investigations showed that it was possible to reduced NOx and soot emissions simultaneously where the NOx reduction was achieved by the presence of EGR and the soot reduction was enhanced by split injection due to improved the mixing process.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Split Injection in a Single Cylinder Optical Diesel Engine

Diez¹,

Zhao²

2010

SAE Technical Paper Series

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Over the last decade, the diesel engine has made dramatic progress in its performance and market penetration. However, in order to meet future emissions legislations, Nitrogen Oxides (NOx) and particulate matters' (PM) emissions will need to be reduced simultaneously. Nowadays researchers are focused on different combustion modes which can have a great potential for both low soot and low NOx. In order to achieve this, different injection strategies have been investigated. This study investigates the effects of split injection strategies with high levels of Exhaust Gas Recirculation (EGR) on combustion performance and emissions in a single cylinder direct injection optical diesel engine. The investigation is focused on the effects of injection timing of split injection strategies.A Ricardo Hydra single cylinder optical engine was used in which conventional experimental methods like cylinder pressure data, heat release analysis and exhaust emissions analysis were applied. Optical techniques like direct spray and combustion visualization were applied by means of a high speed imaging system with a copper vapor laser illumination system and a high-speed two-color system was applied to obtain in-cylinder diesel combustion temperature and soot measurements distributions.

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“…As a result, this could lead to a reduction in particulate emissions at intermediate engine loads. Montgomery et al [10] showed that multiple injection strategies could reduce NOx emissions by lowering the peak in-cylinder temperature when combined with exhaust gas recirculation (EGR) into the cylinder. However, the soot emissions were raised due to some increased temperature rich regions created as a result of the oxygen reduction in the cylinder.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Diesel Engine In-Cylinder Air-Fuel Mixing with Homogeneity Factor: Combined Effects of Pilot Injection Strategies and Air Motion

Dimitriou¹,

Wang²,

Peng³

et al. 2014

SAE Int. J. Engines

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Effects of Multiple Injections and Flexible Control of Boost and EGR on Emissions and Fuel Consumption of a Heavy-Duty Diesel Engine

Cited by 82 publications

References 19 publications

Experimental investigation of hydraulic effects of two-stage fuel injection on fuel-injection systems and diesel combustion in a high-speed optical common-rail diesel engine

Experimental investigation of hydraulic effects of two-stage fuel injection on fuel-injection systems and diesel combustion in a high-speed optical common-rail diesel engine

Investigation of Split Injection in a Single Cylinder Optical Diesel Engine

Analysis of Diesel Engine In-Cylinder Air-Fuel Mixing with Homogeneity Factor: Combined Effects of Pilot Injection Strategies and Air Motion

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