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Basic Concepts on GDI Systems

  • Giovanni Fiengo
  • Alessandro di Gaeta
  • Angelo Palladino
  • Veniero Giglio
Chapter
Part of the SpringerBriefs in Electrical and Computer Engineering book series (BRIEFSELECTRIC)

Abstract

Gasoline Direct Engines offer many advantages as compared to PFI engines, as regard efficiency and specific power. To fully exploit this potential a particular attention must be paid to the in-cylinder formation process of air/fuel mixture. More demanding performance is required to the combustion system, since injectors must provide a fine fuel atomization in considerably short time, achieving a spray pattern able to interact with in-cylinder air motion and piston top surface. This is made possible through the Common Rail technology allowing an injection pressure one order of magnitude higher as compared with that of conventional PFI engines. Fuel economy can be obtained regulating load by mixture leaning, minimizing throttle usage at low loads where pumping losses are more significant, and requiring charge stratification for a stable ignition and combustion. Charge stratification can be pursued based mainly on the sole action of the fuel spray or on its interaction with a specially shaped surface on piston top or with the air bulk motion. Depending on the modality of stratification attainment, different combustion systems can be considered. The injector design has in turn a key role being the final element of fuel metering required to the desired spray pattern, injected fuel mass per injection event, resistance to thermal stress and deposits. Injector housing and orientation with respect to the combustion chamber has to be carefully chosen, exploiting in this regard the indications of computational fluid dynamics (CFD), provided by 3D simulations. Some fundamental scheme is provided for the whole high pressure fuel delivery plant, as employed in current vehicles equipped with GDI spark ignition engines.

Keywords

Fuel Spray Sauter Mean Diameter Spray Penetration Port Fuel Injection Fuel Atomization 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. 1.
    C. Preussner, C. Dring, S. Fehler, S. Kampmann, Gdi: Interaction between mixture preparation, combustion system and injector performance. SAE Technical Paper (no. 980498) (1998).  10.4271/980498
  2. 2.
    W. Anderson, J. Yang, D.D. Brehob, J.K. Vallance, R.M. Whiteaker, Understanding the thermodynamics of direct injection spark ignition (disi) combustion systems: An analytical and experimental investigation. SAE Technical Paper (no. 962018) (1996).  10.4271/962018
  3. 3.
    M. Kawamoto, T. Honda, H. Katashiba, M. Sumida, N. Fukutomi, K. Kawajiri, A study of center and side injection in spray guided disi concept. SAE Technical Paper (no. 2005–01-0106) (2005).  10.4271/2005-01-0106
  4. 4.
    T. Georjon, E. Bourguignon, T.D.B. Delhaye, P. Voisard, Characteristics of mixture formation and combustion in a spray-guided concept gasoline direct injection engine. SAE Technical Paper (no. 2000–01-0534) (2000).  10.4271/2000-01-0534
  5. 5.
    Y. Iwamoto, K. Noma, O. Nakayama, T. Yamauchi, H. Ando, Development of gasoline direct injection engine. SAE Technical Paper (no. 970541) (1997).  10.4271/970541
  6. 6.
    Y. Takagi, T. Itoh, S. Muranaka, A. Iiyama, Y. Iwakiri, T. Urushihara, K. Naitoh, Simultaneous attainment of low fuel consumption high output power and low exhaust emissions in direct injection si engines. SAE Technical Paper (no. 980149) (1998).  10.4271/980149
  7. 7.
    J. Geiger, M. Grigo, O. Lang, P. Wolters, P. Hupperich, Direct injection gasoline engines—combustion and design. SAE Technical Paper (no. 1999–01-0170) (1999).  10.4271/1999-01-0170
  8. 8.
    K. Ahlin, Modelling of pressure waves in the common rail diesel injection system. Ph.D. thesis, University of Linköping, Sweden, 2000Google Scholar

Copyright information

© The Author(s) 2013

Authors and Affiliations

  • Giovanni Fiengo
    • 1
  • Alessandro di Gaeta
    • 2
  • Angelo Palladino
    • 1
  • Veniero Giglio
    • 3
  1. 1.Dipartimento di IngegneriaUniversità degli studi del SannioBeneventoItaly
  2. 2.Istituto MotoriConsiglio Nazionale delle RicercheNapoliItaly
  3. 3.National Research CouncilIstituto MotoriNapoliItaly

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