Improving Fuel Economy in a Turbocharged DISI Engine Already Employing Integrated Exhaust Manifold Technology and Variable Valve Timing

Turner, J. W. G.; Pearson, Richard; Curtis, R.; Holland, B.

doi:10.4271/2008-01-2449

Cited by 12 publications

(5 citation statements)

References 12 publications

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Section: Downsized Gasoline Enginesmentioning

confidence: 99%

“…64 EGR also enables both advanced spark timing and minimal fuel enrichment. Moreover, Turner et al 65 report that on a tested engine, the required Lambda at 5000 r/min and full load is increased from 0.95 to 1 by adding 4% cooled EGR, as shown in Figure 10. Further advantages Reprinted with permission from Ito et al 21 Copyright Ó 2007 SAE International.…”

Section: Downsized Gasoline Enginesmentioning

confidence: 99%

“…Wieske et al 54 tested a 1.4-L two-stage boosted (supercharger and turbocharger) production gasoline engine with various exhaust systems. The full-load BMEP at 1000-2500 r/min is reduced by up to approximately 6 bar by adding a WCEM upstream of the Reprinted with permission from Turner et al 65 Copyright Ó 2008 SAE International. Further use or distribution is not permitted without permission from SAE.…”

Section: Gasoline Vgt Studiesmentioning

confidence: 99%

See 2 more Smart Citations

A review of the application of variable geometry turbines to the downsized gasoline engine

Tang

Pennycott

Akehurst

et al. 2014

International Journal of Engine Research

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Engine downsizing through turbocharging is a proven method of improving fuel economy by using a smaller engine operating at higher levels of specific engine load and higher efficiency. Turbocharging is more challenging for the gasoline engine than the diesel engine due to the higher variability in the flow rate of air and the higher exhaust gas temperature. Although the variable geometry turbine offers the potential for improving the low-end torque, lowering part-load fuel consumption and delivering a fast transient response on a downsized gasoline engine, the cost, durability and the limited allowable turbine inlet temperature on the currently available devices present challenges to widespread application. This article details the main operating principles and types of the variable geometry turbine, its potential to deliver performance improvements, implementation challenges on the gasoline engine and the measures available to alleviate those challenges. Of the available types of variable geometry turbine, the variable nozzle form has the highest efficiency over a wide flow range while the variable flow and sliding wall types have better reliability and lower cost. Using additional technologies such as the water-cooled exhaust manifold, specialist turbocharger materials, exhaust gas recirculation and novel combustion systems in combination with advanced control strategies will facilitate variable geometry turbine application and hence allow further downsizing of the gasoline engine.

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Section: Downsized Gasoline Enginesmentioning

confidence: 99%

Section: Downsized Gasoline Enginesmentioning

confidence: 99%

Section: Gasoline Vgt Studiesmentioning

confidence: 99%

See 1 more Smart Citation

A review of the application of variable geometry turbines to the downsized gasoline engine

Tang

Pennycott

Akehurst

et al. 2014

International Journal of Engine Research

View full text Add to dashboard Cite

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“…Water-cooled exhaust manifold The integrated exhaust manifold (IEM) is becoming a common technology for production engines [10,11], and is particularly advantageous for turbocharged units since it allows the removal of a large degree of component protection over-fuelling at high load [2,12]. Unfortunately, because of the bore pitch and cylinder head bolt spacing necessarily inherited from the AJ133 engine, it was not feasible to design an IEM into the Ultraboost cylinder head (shown in the left-hand side of Figure 6).…”

Section: 4mentioning

confidence: 99%

Ultra boost for economy: realizing a 60% downsized engine concept

Turner

Popplewell

Richardson

et al. 2013

Internal Combustion Engines: Performance, Fuel Economy and Emissions

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“…Over the last few years the integrated exhaust manifold (IEM) has become a common technology for production engines [7,8], having been found to be particularly advantageous in turbocharged engines because it allows the removal of a large degree of component protection overfuelling at high load [9,22].…”

Section: Turner Et Al / Sae Int J Engines / Volume 7 Issue 1 (May mentioning

confidence: 99%

Ultra Boost for Economy: Extending the Limits of Extreme Engine Downsizing

Turner

Popplewell

Patel

et al. 2014

SAE Int. J. Engines

147

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The paper discusses the concept, design and final results from the 'Ultra Boost for Economy' collaborative project, which was part-funded by the Technology Strategy Board, the UK's innovation agency. The project comprised industry-and academiawide expertise to demonstrate that it is possible to reduce engine capacity by 60% and still achieve the torque curve of a modern, large-capacity naturally-aspirated engine, while encompassing the attributes necessary to employ such a concept in premium vehicles.In addition to achieving the torque curve of the Jaguar Land Rover naturally-aspirated 5.0 litre V8 engine (which included generating 25 bar BMEP at 1000 rpm), the main project target was to show that such a downsized engine could, in itself, provide a major proportion of a route towards a 35% reduction in vehicle tailpipe CO 2 on the New European Drive Cycle, together with some vehicle-based modifications and the assumption of stop-start technology being used instead of hybridization. In order to do this vehicle modelling was employed to set part-load operating points representative of a target vehicle and to provide weighting factors for those points. The engine was sized by using the fuel consumption improvement targets and a series of specification steps designed to ensure that the required full-load performance and driveability could be achieved.The engine was designed in parallel with 1-D modelling which helped to combine the various technology packages of the project, including the specification of an advanced charging system and the provision of the necessary variability in the valvetrain system. An advanced intake port was designed in order to ensure the necessary flow rate and the charge motion to provide fuel mixing and help suppress knock, and was subjected to a full transient CFD analysis. A new engine management system was provided which necessarily had to be capable of controlling many functions, including a supercharger engagement clutch and full bypass system, direct injection system, port-fuel injection system, separately-switchable cam profiles for the intake and exhaust valves and wide-range fast-acting camshaft phasing devices.

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Improving Fuel Economy in a Turbocharged DISI Engine Already Employing Integrated Exhaust Manifold Technology and Variable Valve Timing

Cited by 12 publications

References 12 publications

A review of the application of variable geometry turbines to the downsized gasoline engine

A review of the application of variable geometry turbines to the downsized gasoline engine

Ultra boost for economy: realizing a 60% downsized engine concept

Ultra Boost for Economy: Extending the Limits of Extreme Engine Downsizing

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