This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Increasing Torque Output from a Turbodiesel with Camless Valvetrain
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 04, 2002 by SAE International in United States
Annotation ability available
In recent years sales of diesel-powered cars and trucks have increased dramatically worldwide. The efforts to raise specific power of diesel engines to allow for smaller and more efficient powertrains should include variable valvetrain technology.
Some benefits that might become available with application of camshaft-based variable-valve mechanisms have been studied in . Significant progress has also been reported in the development of camless actuation mechanisms [2, 3]. To fully evaluate the torque improvement opportunities for light duty diesel, the authors have assumed that a camless valvetrain will become available in the future. This will provide the ultimate flexibility to choose timing and duration of valve events to maximize full load torque.
Simulation results revealed potential for a substantial increase in engine torque by optimizing the intake and exhaust valve timing together with turbocharger operation. However, improved turbocharger performance is needed, which is not available with current technology. Impact on fuel consumption, and containment of increased peak cylinder pressure are discussed.
CitationTai, C., Tsao, T., Schörn, N., and Levin, M., "Increasing Torque Output from a Turbodiesel with Camless Valvetrain," SAE Technical Paper 2002-01-1108, 2002, https://doi.org/10.4271/2002-01-1108.
- Lancefield T., Methley I., Rase U., and Kuhn T., “The Application of Variable Event Valve Timing to a Modern Diesel Engine,” SAE 2000-01-1229, 2000.
- Schechter M. and Levin M., “Camless Engine,” SAE Paper 960581, 1996.
- Sturman O. Eddie, “Digital Hydraulic Camless Engine”, Variable Valve Actuation TOPTEC: The State of The Art”, SAE TOPTEC Series, September 11-12, 2000, Ypsilanti, Michigan.
- Desantes, J.M., Benajes, J., Lujan, J.M., “Production of Internal EGR in Turbocharged Diesel Engines by means of Intake Valve Pre-lift and Exhaust Post-lift,” SIA 9506A17, 1995