New Variable Intake and Mixture Formation System for Multi-Valve SI Engines

Neusser, Heinz-Jakob; Endres, H.; Breuer, M.

doi:10.4271/940449

Cited by 3 publications

(3 citation statements)

References 1 publication

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“…Different mechanisms have been used to produce swirl and tumble for diluted combustion in contemporary SI engines, including variable swirl/tumble ports [14][15][16][17][18], port blockages [19], vortex stratification [20,21], and valve shrouding [22,23]. Kim et al [14] conducted lean-burn experiments on a 2.4L 4-valve SI engine under part-load operating conditions, with swirl and tumble generated from different intake port geometries.…”

Section: Introductionmentioning

confidence: 99%

“…Dilution limit was extended significantly along with a reduction of NO x emissions up to 75%. Neuber et al [15] designed a variable intake system to produce a combination of swirl and tumble which was applied to a 4valve SI engine. EGR tolerance was extended considerably compared to that with conventional intake system under a part-load operating condition at 2000 rpm, while also improving fuel economy and NO x emissions.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Intake Primary Runner Blockages on Combustion Characteristics and Emissions with Stoichiometric and EGR-diluted Mixtures in SI Engines

He¹,

Selamet²,

Reese³

et al. 2007

SAE Technical Paper Series

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Intake Primary Runner Blockages on Combustion Characteristics and Emissions with Stoichiometric and EGR-diluted Mixtures in SI Engines

He¹,

Selamet²,

Reese³

et al. 2007

SAE Technical Paper Series

View full text Add to dashboard Cite

show abstract

“…Even the latest systems of fuel supply work by ecological requirements to adequate modes. Many investigations are made with gasoline supply systems [2,3]. Modern catalyzing and gas recirculation EGR systems are used [4].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Exhaust Gas Composition of Internal Combustion Engines Using Liquefied Petroleum Gas

Mockus

Sapragonas

Stonys

et al. 2006

Journal of Environmental Engineering and Landscape Management

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The problems of implementation of liquefied petroleum gas (LPG) supply systems are related with the fact that they are alternative systems used in engines constructed and optimized for work with other kinds of fuel. So assemblers of the systems have to evaluate power losses and at the same time ecological requirements. The experiment is devoted to the analysis of gas composition of engines working at different modes in order to specify the particularity of LPG system tuning and to obtain data for the evaluation of environmental pollution by numerical car dynamics models. It is estimated that the algorithms of current LPG systems balance between ecological requirements and optimization of external characteristics of engines, and the gas systems are characterized by a great inertia. Also, it is determined that more precise tuning algorithms must be constructed, and more tuning points and tuning, when an engine works in standard modes, must be foreseen.

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The Effects of Intake Plenum Volume on the Performance of a Small Naturally Aspirated Restricted Engine

Hamilton

Cowart

Lee

et al. 2010

Journal of Engineering for Gas Turbines and Power

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Intake tuning is a widely recognized method for optimizing the performance of a naturally aspirated engine for motorsports applications. Wave resonance and Helmholtz theories are useful for predicting the impact of intake runner length on engine performance. However, there is very little information in the literature regarding the effects of intake plenum volume. The goal of this study was to determine the effects of intake plenum volume on steady state and transient engine performance for a restricted naturally aspirated engine for Formula Society of Automotive Engineers (FSAE) vehicle use. Testing was conducted on a four cylinder 600 cc motorcycle engine fitted with a 20 mm restrictor in compliance with FSAE competition rules. Plenum sizes were varied from 2 to 10 times engine displacement (1.2–6.0 l) and engine speeds were varied from 3000 rpm to 12,500 rpm. Performance metrics including volumetric efficiency, torque, and power were recorded at steady state conditions. Experimental results showed that engine performance increased modestly as plenum volume was increased from 2 to 8 times engine displacement (4.8 l). Increasing plenum volume beyond 4.8 l resulted in significant improvement in performance parameters. Overall, peak power was shown to increase from 54 kW to 63 kW over the range of plenums tested. Additionally, transient engine performance was evaluated using extremely fast (60 ms) throttle opening times for the full range of plenum sizes tested. In-cylinder pressure was used to calculate cycle-resolved gross indicated mean effective pressure (IMEPg) development during these transients. Interestingly, the cases with the largest plenum sizes only took 1 to 2 extra cycles (30–60 ms) to achieve maximum IMEPg levels when compared with the smaller volumes. In fact, the differences were so minor that it would be doubtful that a driver would notice the lag. Additional metrics included time for the plenums to fill and an analysis of manifold absolute pressure and peak in-cylinder pressure development during and after the throttle transient. Plenums below 4.8 l completely filled even before the transient was completed.

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New Variable Intake and Mixture Formation System for Multi-Valve SI Engines

Cited by 3 publications

References 1 publication

Effect of Intake Primary Runner Blockages on Combustion Characteristics and Emissions with Stoichiometric and EGR-diluted Mixtures in SI Engines

Effect of Intake Primary Runner Blockages on Combustion Characteristics and Emissions with Stoichiometric and EGR-diluted Mixtures in SI Engines

Analysis of Exhaust Gas Composition of Internal Combustion Engines Using Liquefied Petroleum Gas

The Effects of Intake Plenum Volume on the Performance of a Small Naturally Aspirated Restricted Engine

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