Automotive Direct-Injection Stratified-Charge Engine Development in the 1970-1980’s

Groff, Edward G.

doi:10.4271/2016-01-0175

Cited by 4 publications

(3 citation statements)

References 57 publications

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“…Stratified charge direct-injection combustion has attracted a lot of attention in the last few decades to improve part-load efficiency of directinjection engines and reduce exhaust emissions. [5][6][7][8][9] In stratified charge DISI engines, the turbulent flame initiated upon ignition of a heterogeneously rich mixture at the spark plug leads to diffusion-controlled combustion of the remaining bulk mixture. The ''leanness'' of this mixture increases with distance from the spark plug in the combustion chamber.…”

Section: Introductionmentioning

confidence: 99%

Thermal efficiency of a dual-mode turbulent jet ignition engine under lean and near-stoichiometric operation

Vedula

Song

Stuecken

et al. 2017

International Journal of Engine Research

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Turbulent jet ignition is a combustion technology that can offer higher thermal efficiency compared to the homogeneous spark ignition engines. A potential combustion-related challenge with turbulent jet ignition is the pre-chamber misfiring due to improperly scavenged combustion residuals and maintaining the mixture composition there. Dual-mode turbulent jet ignition is a novel combustion technology developed to address the aforementioned issues. The dual-mode turbulent jet ignition is an engine combustion technology wherein an auxiliary air supply apart from an auxiliary fuel injection is provided into the pre-chamber. This technology can offer enhanced stoichiometry control and combustion stability in the pre-chamber and subsequently combustion control in the main chamber. In this work, engine testing of a single-cylinder dual-mode turbulent jet ignition engine having a compression ratio of 12.0 was completed with liquid gasoline and the indicated thermal efficiency was measured. High-speed pressure recordings were used to compare and analyze different operating conditions. Coefficient of variation in the indicated mean effective pressure and the global air/fuel equivalence ratio values were used to characterize the engine operation. Lean operating conditions for a global air/fuel equivalence ratio of 1.85 showed an indicated efficiency of 46.8% ± 0.5% at 1500 r/min and 6.0 bar indicated mean effective pressure. In addition, the combustion stability of this engine was tested with nitrogen dilution. The nitrogen diluent fraction was controlled by monitoring the intake oxygen fraction. The dual-mode turbulent jet ignition engine of compression ratio 12.0 delivered an indicated efficiency of 46.6% ± 0.5% under near-stoichiometric operation at 1500 r/min and 7.7 bar indicated mean effective pressure with a coefficient of variation in indicated mean effective pressure of less than 2% for all conditions tested.

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Section: Introductionmentioning

confidence: 99%

Thermal efficiency of a dual-mode turbulent jet ignition engine under lean and near-stoichiometric operation

Vedula

Song

Stuecken

et al. 2017

International Journal of Engine Research

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“…Emisyonunun arttığı görülmektedir. Yakıt parçalanıp küçüldükçe daha homojen bir karışım oluşur, oksijenle temas yüzeyi artarak yanma hızlanır (Groff 2016). Ultrasonik yakıt sistemi ile çalışmada CO2 emisyonunun motor devir sayısı ile değişmediği görülmektedir.…”

Section: Co2 Emisyonlarıunclassified

“…Yakıt atomizasyon kalitesinin yüksek olması hava yakıt karışımının daha homojen olacağı anlamına gelir. Homojen karışım, termik verimi arıttıracağı gibi egzoz emisyon değerlerini de düşürmektedir (Groff 2016). Ultrasonik transduser kullanarak elektrik enerjisi mekanik enerjiye veya mekanik enerji elektrik enerjisine dönüştürülebilir (Zhang et al 2012).…”

Section: Introductionunclassified

Investigation of the Effect of Using Ultrasonic Fuel System on Exhaust Emissions in a Spark Ignition Engine

ÖNER

ÖZTÜRK

Tanyeri

2022

Afyon Kocatepe University Journal of Sciences and Engineering

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Fragmentation and mixing of the fuel used in spark ignition engines with air is highly effective on combustion and exhaust emissions. Studies are carried out on fuel systems in order to prepare the ideal air-fuel mixture ratio suitable for different operating conditions of the engine. In this study, ultrasonic fuel system was used as an alternative to the traditional fuel systems used in spark ignition engines. The average droplet diameter of 20-30 µm in the injector fuel system used in spark ignition engines has been realized as 12 µm with ultrasonic fragmentation. The engine was run at ½ constant load at different speeds with ultrasonic, carburetor and injection fuel systems, and exhaust emissions were measured. The maximum values of the measured exhaust emissions for the three fuel systems were examined comparatively. When the ultrasonic fuel system is used, there is a 99% reduction in CO, 60% in HC, 18% in NOx, 10% and an increase in CO2 compared to the carburetor system, 99% reduction in CO, 12% in CO2, and 45% in HC compared to the injector system. It was observed that there was a 55% increase in NOx. In general, it has been determined that the ultrasonic fuel system has a positive effect on exhaust emissions.

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Multiple injection for improving knock, gaseous and particulate matter emissions in direct injection SI engines

et al. 2020

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Automotive Direct-Injection Stratified-Charge Engine Development in the 1970-1980’s

Cited by 4 publications

References 57 publications

Thermal efficiency of a dual-mode turbulent jet ignition engine under lean and near-stoichiometric operation

Thermal efficiency of a dual-mode turbulent jet ignition engine under lean and near-stoichiometric operation

Investigation of the Effect of Using Ultrasonic Fuel System on Exhaust Emissions in a Spark Ignition Engine

Multiple injection for improving knock, gaseous and particulate matter emissions in direct injection SI engines

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