Project Sabre: A Close-Spaced Direct Injection 3-Cylinder Engine with Synergistic Technologies to Achieve Low CO2 Output

Coltman, D.; Turner, J. W. G.; Curtis, R.; Blake, Darren; Holland, B.; Pearson, Richard; Arden, A.; Nuglisch, H.

doi:10.4271/2008-01-0138

Cited by 32 publications

(17 citation statements)

References 11 publications

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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%

“…Various supporting technologies have been developed and productionized such as the adoption of pulse-divided exhaust manifolds in 4-and even 8-cylinder engines [4,5], the use of integrated exhaust manifolds [6], combinations of the two [7], or adoption of 3-cylinder groups with or without some of the other features [8,9]. Furthermore, combined super-and turbocharging systems have also been in production for some time, allowing positive pressure to be applied to the intake all the time and desensitizing the engine to the pulse overlap effects (particularly an issue in four or more cylinder groups) [10].…”

Section: Commercial Viewmentioning

confidence: 99%

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

Turner

Popplewell

Patel

et al. 2014

SAE Int. J. Engines

Self Cite

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

confidence: 99%

Section: Commercial Viewmentioning

confidence: 99%

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

Turner

Popplewell

Patel

et al. 2014

SAE Int. J. Engines

Self Cite

147

View full text Add to dashboard Cite

show abstract

“…The combustion duration is calculated using: [4] The effect of cooled EGR on the SI turbocharged direct injection gasoline engine is analyzed by using CA50, combustion duration, combustion temperature and ignition advance. With these four variables it is enough to understand the effect of the EGR on the system.…”

Section: Diagnostic Of the Combustion Processmentioning

confidence: 99%

“…This SI engine technology reduces the fuel consumption by increasing the compression ratio and specific heats of the working fluids, and also by reducing the pumping and friction losses as described by Coltman et al [4].…”

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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“…Specifically, early intake valve closure (EIVC), late inlet valve closing (LIVC), and reduced valve lift permit interesting improvement in fuel economy and exhaust emissions at partial load [14][15][16][17]. Furthermore, in multivalve engines, the deactivation of an intake valve and the possibility to impose different lifts between the inlet valves are considered promising strategies [18][19][20]. Patel et al [21] analysed a single-cylinder direct injection spark ignition engine fuelled with 95 RON gasoline.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of the fluid dynamic efficiency of standard and alternative intake strategies for multivalve spark-ignition engines

Algieri

2013

IJET

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The work aims at investigating the fluid dynamic performances of a multivalve spark-ignition engine and at evaluating the influence of the throttling process on the engine permeability. To this purpose, a production four-stroke internal combustion engine is analysed during the intake phase. The experimental characterisation is carried out at the steady flow rig in terms of dimensionless discharge and flow coefficients. The global investigation illustrates the noticeable effect of the valve lift on the engine head breathability. Furthermore, the experimental analysis demonstrates that the throttling process has a significant influence on the volumetric efficiency of the intake system and this effect increases with the valve lift. Finally, alternative strategies are studied in order to improve the engine fluid dynamic efficiency at partial loads. Specifically, the research shows that inlet valve deactivation and the adoption of asymmetric intake valve lifts assure an increase in head permeability.

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Project Sabre: A Close-Spaced Direct Injection 3-Cylinder Engine with Synergistic Technologies to Achieve Low CO2 Output

Cited by 32 publications

References 11 publications

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

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

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

Comparative analysis of the fluid dynamic efficiency of standard and alternative intake strategies for multivalve spark-ignition engines

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