New 3.5-L V6 gasoline engine with direct injection from mercedes-benz

Waltner, Anton; Lückert, Peter; Doll, Gerhard; Kemmler, Roland

doi:10.1007/bf03227038

Cited by 5 publications

(5 citation statements)

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“…All the SGSC engines that have gone into production have used multiple-pulse injection with large-angle hollow-cone sprays generated by piezo-electrically actuated outwardly opening A-nozzle injectors, 33–37,96 which were described briefly in Section 1.3 and contrasted with solenoid-actuated multi-hole injectors in connection with Figure 4. In this section, as in our discussion of multi-hole-injection SGSC engines, we review the distinctive aspects of stable piezo-SGSC combustion; in the next section, we consider sources of combustion instability.…”

Section: Spray-guided Combustion With Piezo-electric Injectorsmentioning

confidence: 99%

“…Figures 39–41) together with measurements in all-metal piezo-SGSC engines to expand the range of injection and spark timings over which stable combustion could be achieved while maintaining acceptable engine-out emissions. 33–37,49,90,96,100,101,105,106 However, almost nothing quantitative appears to have been published to connect variability in the fuel distribution to combustion instability.…”

Section: Spray-guided Combustion Instability With Piezo Injectorsmentioning

confidence: 99%

“…SGSC engines with improved fuel economy and lower emissions initially reached production in Europe in 2006 and continue in naturally aspirated and turbocharged designs. 33–37 The close coupling (in both space and time) between injection and ignition in SG engines improves fuel economy by enabling expanded speed-load and dilution ranges for stratified operation. Viable SG engines also employ a carefully optimized piston bowl.…”

Section: Introductionmentioning

confidence: 99%

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Invited Review: Combustion instability in spray-guided stratified-charge engines: A review

Fansler

Reuss

Sick

et al. 2015

International Journal of Engine Research

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This article reviews systematic research on combustion instabilities (principally rare, random misfires and partial burns) in spray-guided stratified-charge (SGSC) engines operated at part load with highly stratified fuel -air -residual mixtures. Results from high-speed optical imaging diagnostics and numerical simulation provide a conceptual framework and quantify the sensitivity of ignition and flame propagation to strong, cyclically varying temporal and spatial gradients in the flow field and in the fuel -air -residual distribution. For SGSC engines using multi-hole injectors, spark stretching and locally rich ignition are beneficial. Combustion instability is dominated by convective flow fluctuations that impede motion of the spark or flame kernel toward the bulk of the fuel, coupled with low flame speeds due to locally lean mixtures surrounding the kernel. In SGSC engines using outwardly opening piezo-electric injectors, ignition and early flame growth are strongly influenced by the spray's characteristic recirculation vortex. For both injection systems, the spray and the intake/compression-generated flow field influence each other. Factors underlying the benefits of multi-pulse injection are identified. Unresolved questions include (1) the extent to which piezo-SGSC misfires are caused by failure to form a flame kernel rather than by flame-kernel extinction (as in multi-hole SGSC engines); (2) the relative contributions of partially premixed flame propagation and mixing-controlled combustion under the exceptionally late-injection conditions that permit SGSC operation on E85-like fuels with very low NOx and soot emissions; and (3) the effects of flow-field variability on later combustion, where fuel-air-residual mixing within the piston bowl becomes important.

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Section: Spray-guided Combustion With Piezo-electric Injectorsmentioning

confidence: 99%

Section: Spray-guided Combustion Instability With Piezo Injectorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Invited Review: Combustion instability in spray-guided stratified-charge engines: A review

Fansler

Reuss

Sick

et al. 2015

International Journal of Engine Research

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“…Enleanment can reduce both heat losses and pumping work and increase the ratio of specific heats of the working fluids. The first direct-injection (DI) gasoline engines to enter mass production utilised lean-stratified operation [5][6][7][8], their wall-guided combustion systems were superseded by spray-guided engines with piezo-electric injectors [9][10][11][12]. Boosted lean direct-injection gasoline engines were first demonstrated almost 20 years ago [13,14], they entered series production in 2012 [15].…”

Section: Introductionmentioning

confidence: 99%

A New Generation Lean Gasoline Engine for Premium Vehicle CO₂ Reduction

Osborne¹,

Lane²,

Turner³

et al. 2021

SAE Technical Paper Series

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In an era of rapidly increasing vehicle electrification, the gasoline engine remains a vital part of the passenger car powertrain portfolio. Lean-burn combustion is a formidable means for reducing the CO2 emissions of gasoline engines but demands the use of sophisticated emissions control.A 2.0 litre turbocharged direct-injection gasoline engine has been developed with a lean homogeneous combustion system matched to a robust lean and stoichiometric-capable exhaust aftertreatment. The aftertreatment system includes an SCR system and a GPF with filtration down to 10 nm particle size. The engine is equipped with a continuously variable valve-lift system, high-tumble ports and a highenergy ignition system; the boosting system comprises a variable geometry turbocharger and a 48 V electrical supercharger.The work reported formed part of the PaREGEn (Particle Reduced, Efficient Gasoline Engines) project under the Horizon 2020 framework programme. In this project, further development of gasoline engines as used in mid to premium-sized cars was undertaken, with the objective to reduce CO2 emissions by 15% under Euro 6d RDE (Real Driving Emissions) legislation and with particle number emissions measured down to 10 nm. This paper will give a detailed treatment of the multi-cylinder engine and vehicle development undertaken. The engine delivered BSFC benefits exceeding 10% and a peak brake thermal efficiency of 42%, while the vehicle demonstrated a NOx conformity factor below 1.0 in independent RDE tests.

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“…2 New-generation SC DISI engines, commonly referred to as spray-guided (SG) SC DISI engines, reached production in Europe initially in 2006 and continue in naturally aspirated and turbocharged designs. [3][4][5][6][7] SG combustion provides improved fuel economy and lower emissions as compared to traditional wall/air-guided SC combustion system. The closely coupled injection and ignition and the carefully optimized piston bowl for these SG SC engines improve fuel economy by enabling stratified operation over larger ranges of speed, load and charge dilution.…”

Section: Introductionmentioning

confidence: 99%

Utilizing boost and double injections for enhanced stratified-charge direct-injection spark-ignition engine operation with gasoline and E30 fuels

Zeng

Sjöberg

2017

International Journal of Engine Research

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This study systematically explores the effects of injection strategy and exhaust-gas recirculation on boosted stratifiedcharge operation of a direct-injection spark-ignition engine using gasoline and E30 fuels at absolute intake pressures in the range of 100-160 kPa. Nitrogen dilution is used to lower the intake mole fraction of oxygen to simulate the dilution effects of exhaust-gas recirculation. The engine is operated at 1000 r/min with an gross indicated mean effective pressure range of 380-680 kPa. In summary, significant reductions of engine-out NO x and soot emissions can be achieved for stratified operation while still maintaining stable combustion (~2% gross indicated mean effective pressure variability) and high thermal efficiency (~40%). Adding exhaust-gas recirculation significantly suppresses NO x emissions, not only by reducing flame temperatures but also by slowing down the combustion which effectively retards the combustion phasing. A well-designed closely spaced double-injection strategy is key to combustion stabilization and plays an important role to suppress soot emissions. Intake boost allows reaching higher loads with further reduced soot emissions. High-speed dual-camera flame imaging reveals key features of flame propagation for stratified operation with low NO x emissions at high exhaust-gas recirculation levels. Heat release rate-based conditional analysis of flame images shows that compared to single injection, the use of double injections creates a spark plasma that is more stretched out, correlating with a more stable early combustion. It also demonstrates that double injections produce more symmetric flame propagation with smaller soot-containing regions, indicating more favorable fuel distributions. Stratified operation with gasoline and E30 fuels demonstrates similar engine performance and emission levels for double injections. These observations suggest that E0 (gasoline)-E30 fuel blends can be compatible with highly efficient stratified-charge spark-ignited operation. However, for a 50/50 double-injection strategy, E30 showed elevated smoke emissions for operation without intake boost, indicating that certain operating strategies can be adversely affected by the ethanol content of E30 fuel blends.

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New 3.5-L V6 gasoline engine with direct injection from mercedes-benz

Cited by 5 publications

References 0 publications

Invited Review: Combustion instability in spray-guided stratified-charge engines: A review

Invited Review: Combustion instability in spray-guided stratified-charge engines: A review

A New Generation Lean Gasoline Engine for Premium Vehicle CO₂ Reduction

Utilizing boost and double injections for enhanced stratified-charge direct-injection spark-ignition engine operation with gasoline and E30 fuels

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New 3.5-L V6 gasoline engine with direct injection from mercedes-benz

Cited by 5 publications

References 0 publications

Invited Review: Combustion instability in spray-guided stratified-charge engines: A review

Invited Review: Combustion instability in spray-guided stratified-charge engines: A review

A New Generation Lean Gasoline Engine for Premium Vehicle CO2 Reduction

Utilizing boost and double injections for enhanced stratified-charge direct-injection spark-ignition engine operation with gasoline and E30 fuels

Contact Info

Product

Resources

About

A New Generation Lean Gasoline Engine for Premium Vehicle CO₂ Reduction