This content is not included in your SAE MOBILUS subscription, or you are not logged in.
New Variable Intake and Mixture Formation System for Multi-Valve SI Engines
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 01, 1994 by SAE International in United States
Annotation ability available
To meet the future challenges of reducing fuel consumption and exhaust emissions, load and speed dependent control of mixture formation and the combustion process are necessary. Although variable intake systems will contribute to this issue, current designs are characterized by costly deactivation mechanisms and have sensitivity to production tolerances.
In this paper, a new type of variable intake and mixture formation system is presented, which offers a new, economical and reliable way to control mixture formation and charge motion. A theoretical analysis was done to determine the best geometric dimensions and subsequent experimental results demonstrated the best potential strategies for reducing fuel consumption and exhaust emissions through improvements in lean burn capability and EGR-tolerance.
Compared to conventional port deactivation systems, all control features have been realized with a reduced number of required parts. Fexible mixture formation is achieved with a combination of single point (SPI) and multi point (MPI) injection which, in combination with a novel deactivation method, provides the potential for a high level of EGR tolerance as well as lean burn capability.
CitationNeußer, H., Endres, H., and Breuer, M., "New Variable Intake and Mixture Formation System for Multi-Valve SI Engines," SAE Technical Paper 940449, 1994, https://doi.org/10.4271/940449.
- EWG- Richtlinie 88/436/EEC
- Automobil Revue 1980-1993
- Endres, H. Neußer, H.-J. Wurms, R. Influence of Swirl and Tumble on Economy and Emissions of Multi-Valve SI-Engines SAE 920516
- Willenbockel, O. Indra, F. Aachen Colloquium Automobile and Engine Technology Oct. 1989
- Kramer, F. The 4-Cylinder 4-Valve SI-Engine for BMW's 318is 3 Aachen Colloquium Automobile and Engine Technology Oct. 1991
- Geiger, J. RWTH Aachen 1992
- Endres, H. Thöne, H. Neußer, H.-J. Intake and Fuel/Air Mixing System Multi-Cylinder, Externally Ignited Internal Combustion Engines
- Endres, H. Schulte, H. Krebs, R. Combustion System Development Trends for Multi-Valve Gasoline Engines SAE 900652 Detroit Febr. 1990