This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Strategies to Improve SI-Engine Performance by Means of Variable Intake Lift, Timing and Duration
Annotation ability available
Sector:
Language:
English
Abstract
This paper reports the results of theoretical and experimental investigations in the field of variable intake - valve control of spark-ignition engines. Different degrees of freedom for a variable intake profile such as variable intake opening and closing events, variable valve lift, as well as the deactivation of one of the intake valves per cylinder of a multi-valve engine are considered and evaluated concerning their potential to reduce pumping losses, to support mixture formation, and to improve combustion. The investigations show that additional efforts are necessary to convert the potential of minimized pumping losses due to unthrottled SI-engine load control into reduced fuel consumption and good driveability. Increased gas velocities during intake for low engine speed and load and adjusted residual-gas fractions according to the different operating conditions prove to be very efficient parameters to improve engine performance under unthrottled conditions. Another important aspect is the optimized intake-lift profile for maximum volumetric efficiency over the whole engine speed range, taking into account the dimensions of the intake manifold and the possibility to deactivate one of the intake valves of a 4-valve-per-cylinder engine.
Recommended Content
Authors
Citation
Kreuter, P., Heuser, P., and Schebitz, M., "Strategies to Improve SI-Engine Performance by Means of Variable Intake Lift, Timing and Duration," SAE Technical Paper 920449, 1992, https://doi.org/10.4271/920449.Also In
References
- Hockel, K. “Untersuchung zur Laststeuerung beim Ottomotor” TU München Mai 1982
- Kreuter, P. Untersuchungen zur “Leistungssteuerung für Otto- Ottomotoren” TH Aachen April 1983
- Sudhaus, N. “Möglichkeiten und Grenzen der Inertgassteuerung für Ottomotoren mit variablen Ven-tilsteuerzeiten” TH Aachen Juli 1988
- Wellmann, N. “Untersuchung des Einflusses variabler Hubfunktionen des Einlaβventils auf den ottomotorischen Prozeβablauf mittels einer hydraulischen Ventilsteuerung” TH Aachen Mai 1989
- Böttcher, K “Untersuchungen zur Verbesserung des Betriebsver-haltens von Mehrventil-Ottomotoren mit Hilfe einer variablen Einlaβventilsteuerung” TH Aachen Februar 1990
- Heuser, F.-P. “Untersuchungen zur Optimierung von Gemisch-bildung und Verbrennung eines freiansaugenden Ottomotors im unteren Drehzahl - und Lastbereich mit Hilfe variabler Steuer-zeiten” TH Aachen Juli 1988
- Gray, C “A Review of Variable Engine Valve Timing” SAE-Paper 880386
- Stone, R. Kwan, E. “Variable Valve Actuation Mechanisms and the Potential for their Application” SAE-Paper 890673
- Dresner, T. L. Barkan, P. “A Review and Classification of Variable Valve Timing Mechanisms” SAE-Paper 890674
- Grohn, M. Wolf, K. “Variable Steuerungszeiten an den neuen Vierventil-Motoren” Beitrag zum 10. Int. Wiener Motorensymposium 4 89 VDI-Verlag
- Maekawa, K. et al “Development of a Valve Timing Control System” SAE-Paper 890680
- Inoue, K et al “A High Power, Wide Torque Range, Efficient Engine with a Newly Developed Variable-Valve-Lift and -Timing Mechanism” SAE-Paper 890675
- Lenz, H.P. et al “Initial Test results of an Electro-Hydraulic Variable-Valve Actuation System on a Firing Engine” SAE-Paper 890678
- “Elektromagnetisch arbeitende Stelleinrichtung” Pischinger, F.
- “Stelleinrichtung für ein zwischen zwei Endstellungen verstellbares Schaltelement” FEV Motorentechnik
- “Electromagnetically operated IC Engine Valves” British Leyland
- Endres, H. Schulte, H. Krebs, R. “Combustion System Development Trends for Multi-Valve Gasoline Engines” SAE-Paper 900652