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The Influence of Variable Valve Actuation on the Part Load Fuel Economy of a Modern Light-Duty Diesel Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 03, 2003 by SAE International in United States
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An investigation has been carried out to identify how variable valve actuation (VVA) can be used to improve the part load fuel economy of a modern light-duty diesel engine. The base engine examined employed a variable geometry turbo-charger (VGT) with air to air inter-cooling, cooled exhaust gas re-circulation (EGR) and common rail fuel injection. The VVA system investigated was of the variable duration type, controlling primarily exhaust valve opening and intake valve closing events.
This paper describes how the fuel economy of the base engine was affected by the interactions of the VGT and EGR systems. It then presents simulation data that shows the methods by which fuel economy can be improved by the use of VVA, explains the phenomena that lead to this improvement and quantifies the extent to which it can be improved: Indicated and brake specific fuel consumption improvements of up to 6% and 19% respectively, were found during the course of this work.
CitationLancefield, T., "The Influence of Variable Valve Actuation on the Part Load Fuel Economy of a Modern Light-Duty Diesel Engine," SAE Technical Paper 2003-01-0028, 2003, https://doi.org/10.4271/2003-01-0028.
- Pethers P. (1997) The business perspective - Engineering affordable solutions to the HSDI Diesel Euro IV challenge. I. Mech. E. Conference: Euro IV challenge - Future technologies and systems. 3-4 December 1997, London.
- Tai, C., Tsao, T., Schörn, N. and Levin, B. (2002) Increasing torque output from a turbodiesel with camless valvetrain. SAE paper 2002-01-1108.
- Lancefield, T.M., Methley, I., Räse, U. and Kuhn, T. (2000) The application of variable event valve timing to a modern diesel engine. SAE paper 2000-01-1229.
- Griffiths P. J. and Mistry K.N., (1988) Variable valve timing for fuel economy improvement, the Mitchell system. SAE paper 880392.
- Lancefield, T.M., Gayler, R.J. and Chattopadhay, (1993) The practical application and effects of a Variable Valve Timing System. SAE paper 930825.
- Bertsch, A and Hannibal, W. (1997) Vast - A new variable valve timing system for vehicle engines. SAE paper 980769.
- Hara, S., Hidaka, A., Tomisawa, N., Nakamura, M., Todo, T., Takemura, S. and Nohara, T. (2000) Application of a variable valve event and timing system to automotive engines. SAE paper 2000-01-1224.
- Osborne, R.P. and Morris, T. (2002) Aspects of EGR control on turbocharged light-duty diesel engines. Paper C602/013/2002 from the seventh International conference on Turbochargers and Turbocharging Published by the Institution of Mechanical Engineers; London May 2002.
- Lancefield, T.M., Cooper, L. and French, B. (1996) Designing the control and simulation of EGR. Automotive Engineer February/March 1996.
- Wolfer, H.H., (1938) Der zünderzug im dieselmotor. CDI-Forschungsheft.
- Watson, N., Pilley, A.D. and Marzouk, M., (1980) A combustion correlation for diesel engine simulation. SAE paper 800029.