Stability Improvement of Direct Fuel Injection Engine under Lean Combustion Operation

Nogi, Toshiharu; Shiraishi, Takashi; Nakayama, Youko; Ohsuga, Minoru; Kurihara, Nobuo

doi:10.4271/982703

Cited by 13 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Effects of GDI Deposit on Engine PerformanceThe effects of injector deposit on engine performance and emissions have been widely reported[1,13,14,28,29,37,43,[76][77][78][79]. An accelerated deposit formation test was carried out on a four-cylinder GDI engine, using a fuel with additives known to accelerate deposit formation[79].…”

mentioning

confidence: 99%

Fuel injector deposits in direct-injection spark-ignition engines

Wang

et al. 2015

Progress in Energy and Combustion Science

154

View full text Add to dashboard Cite

Controlling fuel injector deposits is recognised as a challenge for advanced direct-injection sparkignition (DISI) engines. This paper gives a comprehensive overview of the research on formation, measurement, effect, and mitigation of injector deposits in DISI engines. Methodologies for the injector deposit studies include visual and compositional analysis. It is shown that injector deposits will reduce injector fuel flow rates, and lead to changes in spray characteristics. Consequently, spray angle and envelope are likely to be affected, and spray penetration distance as well as droplet diameter can be increased. Injector deposits are revealed to be primarily fuel-derived and created by two distinct free radical pathways, i.e., low temperature auto-oxidation and high temperature pyrolysis. Fuel compositions (olefins, aromatics, and sulphur), as well as T90 parameter, are significant factors in injector deposit formation. The worst consequences of injector fouling are pre-ignition, and engine misfiring and malfunction. Emissions, especially particulates, dramatically increase as the fuel injector becomes fouled. It appears that fuel detergent is the most effective method in controlling injector deposit formation if its chemistry and dosage rate are optimized. Outward opening piezo-driven injector configuration with a good surface finish, a sharp nozzle inlet, and a counter bore design, is useful in preventing injector deposit formation. Reducing injector nozzle temperature by methods such as designing special injector cooling passages, and improving engine design are also proven to be 2 helpful in reducing injector fouling. Anti-deposit coatings only delay the onset of injector deposit formation.

show abstract

mentioning

confidence: 99%

Fuel injector deposits in direct-injection spark-ignition engines

Wang

et al. 2015

Progress in Energy and Combustion Science

154

View full text Add to dashboard Cite

show abstract

“…There are different types of injectors used for GDI engines, the most common being swirl injectors. 20–22 Other than the swirl injectors, slit-type 23 and air-assisted 5 injectors are also used in GDI engines, the later being more popular for two-stroke GDI engines. 24 Two different injector concepts are presently being tried for the spray-guided system.…”

Section: Introductionmentioning

confidence: 99%

A new injector concept for multimode operation in gasoline direct injection engines

Devassy

Bakshi

Ramesh

2013

International Journal of Engine Research

View full text Add to dashboard Cite

A gasoline direct injection engine typically operates in multiple fuel preparation modes. In general, at higher loads, a homogeneous mixture is favored, whereas a stratified mixture is preferred at part-and low-load conditions. This is usually achieved by altering the injection parameters and injection strategy with respect to load and speed and through appropriate cylinder and piston geometries. In this article, a new injector concept has been proposed to aid attaining multiple modes in a gasoline direct injection engine. This is achieved by shaping the spray structure to suit the required mixture preparation. Detailed simulations are performed to assess the mixing process in a gasoline direct injection engine using the new injector. The charge preparation at the onset of ignition is studied for different injection modes of the same injector. The results indicate a significant improvement in the mixing process for different modes of operation.

show abstract

Combustion Stability Analysis

Maurya¹

2019

Mechanical Engineering Series

View full text Add to dashboard Cite

Stability Improvement of Direct Fuel Injection Engine under Lean Combustion Operation

Cited by 13 publications

References 5 publications

Fuel injector deposits in direct-injection spark-ignition engines

Fuel injector deposits in direct-injection spark-ignition engines

A new injector concept for multimode operation in gasoline direct injection engines

Combustion Stability Analysis

Contact Info

Product

Resources

About