Comparison between Unthrottled, Single and Two-valve Induction Strategies Utilising Direct Gasoline Injection: Emissions, Heat-release and Fuel Consumption Analysis

Patel, Rajnikant; Ladommatos, Nicos; Stansfield, P.; Wigley, Graham; Garner, Colin P.; Pitcher, Graham; Turner, J. W. G.; Nuglisch, H.

doi:10.4271/2008-01-1626

Cited by 14 publications

(11 citation statements)

References 11 publications

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“…However, the combination of EIVC with homogeneous Direct Injection (DI) has also begun to warrant interest, with the potential for further fuel savings if used together with increased compression ratio. For example, workers on the "Hotfire" collaborative project recently examined such effects in both optical and thermodynamic single cylinder SI engine assemblies (19,20). During this study, greatest fuel consumption benefits could be achieved if just one of the two inlet valves was actuated.…”

Section: Introductionmentioning

confidence: 99%

Combining Unthrottled Operation with Internal EGR under Port and Central Direct Fuel Injection Conditions in a Single Cylinder SI Engine

Cairns¹,

Todd²,

Hoffman³

et al. 2009

SAE Technical Paper Series

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The Engineering Meetings Board has approved this paper for publication. It has successfully completed SAE's peer review process under the supervision of the session organizer. This process requires a minimum of three (3) reviews by industry experts. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. ISSN 0148-7191 Positions and opinions advanced in this paper are those of the author(s) and not necessarily those of SAE. The author is solely responsible for the content of the paper. SAE ABSTRACTThis experimental work was concerned with the combination of internal EGR with an early inlet valve closure strategy for improved part-load fuel economy. The experiments were performed in a new spark-ignited thermodynamic single cylinder research engine, equipped with a mechanical fully variable valvetrain on both the inlet and exhaust. During unthrottled operation at constant engine speed and load, increasing the mass of trapped residual allowed increased valve duration and lift to be used. In turn, this enabled further small improvements in gas exchange efficiency, thermal efficiency and hence indicated fuel consumption. Such effects were quantified under both port and homogeneous central direct fuel injection conditions. Shrouding of the inlet ports as a potential method to increase in-cylinder gas velocities has also been considered.

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Section: Introductionmentioning

confidence: 99%

Combining Unthrottled Operation with Internal EGR under Port and Central Direct Fuel Injection Conditions in a Single Cylinder SI Engine

Cairns¹,

Todd²,

Hoffman³

et al. 2009

SAE Technical Paper Series

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show abstract

“…Urata et al [19] developed Hydraulic Variable-valve Train (HVT) that can be closed at arbitrary timings and capable of withstanding engine speeds up to 6000rpm, they reported reduced pumping loss of 80% and about 7% reduced fuel consumption, they also observed lower in-cylinder compression temperature and increased combustion fluctuation under low load. More recently, Patel et al [20] reported that the EIVC could be used to improve part-load fuel efficiency in a direct injection gasoline engine.…”

Section: Introductionmentioning

confidence: 98%

Part-load performance and emissions analysis of SI combustion with EIVC and throttled operation and CAI combustion

Ojapah¹,

Zhang²,

Zhao³

2013

Internal Combustion Engines: Performance, Fuel Economy and Emissions

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“…However, the combination of EIVC with homogeneous Direct Injection (DI) has also begun to warrant interest, with the potential for further fuel savings if used together with increased compression ratio. For example, workers on the "Hotfire" collaborative project recently examined such effects in both optical and thermodynamic single cylinder SI engine assemblies (18,19). During this study, greatest fuel consumption benefits could be achieved if just one of the two inlet valves was actuated.…”

Section: Introductionmentioning

confidence: 99%

A Study of Alcohol Blended Fuels in an Unthrottled Single Cylinder Spark Ignition Engine

Cairns¹,

Todd²,

Aleiferis³

et al. 2010

SAE Technical Paper Series

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This work involved study of the effects of alcohol blends on combustion, fuel economy and emissions in a single cylinder research engine equipped with a mechanical fully variable valvetrain on the inlet and variable valve timing on the exhaust. A number of splash blends of gasoline, iso-octane, ethanol and butanol were examined during port fuel injected early inlet valve closing operation, both with and without variable valve timing. Under low valve overlap conditions, it was apparent that the inlet valve durations/lifts required for full unthrottled operation were remarkably similar for the wide range of blends studied. However, with high valve overlap differences in burning velocities and internal EGR tolerances warranted changes in these valve settings. In turn, it was concluded that high ethanol content blends facilitated minimum throttling at the inlet valve itself and the largest relative savings in terms of fuel consumption, engine-out emissions of NOx and (corrected) unburned hydrocarbons.

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Comparison between Unthrottled, Single and Two-valve Induction Strategies Utilising Direct Gasoline Injection: Emissions, Heat-release and Fuel Consumption Analysis

Cited by 14 publications

References 11 publications

Combining Unthrottled Operation with Internal EGR under Port and Central Direct Fuel Injection Conditions in a Single Cylinder SI Engine

Combining Unthrottled Operation with Internal EGR under Port and Central Direct Fuel Injection Conditions in a Single Cylinder SI Engine

Part-load performance and emissions analysis of SI combustion with EIVC and throttled operation and CAI combustion

A Study of Alcohol Blended Fuels in an Unthrottled Single Cylinder Spark Ignition Engine

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