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Analysis of Diesel Engine Emissions Reduction by Late Intake Valve Close and VTG Turbocharger Using 1-D Simulation
Technical Paper
2008-01-2444
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A 1-D GT-Power model based investigation has been carried out to identify the impact of late intake valve closing (LIVC) on fuel economy and emission reduction of a modern small bore diesel engine. The diesel engine examined employed a variable turbine geometry (VTG) turbocharger with air-to-air charge cooler, cooled low pressure exhaust gas re-circulation (LP-EGR), and cooled high pressure exhaust gas re-circulation (HP-EGR). The LIVC system investigated varied the closing time of the intake valve by increasing or decreasing the dwell at the maximum valve lift point.
This paper describes how the fuel economy and NOx emission of the diesel engine were affected by varying the intake valve closing time. The intake valve closing time was delayed by as much as 60 degrees. The intermediate speed, low load 3000 rpm, 5 bar BMEP, 10% HP - EGR, and 2000 rpm, 4 bar BMEP, 10% LP - EGR operation points were chosen as the engine running conditions, since turbocharger potential at these conditions can be greatly explored to investigate the variable valve timing effect. By combining variable valve timing technology with VTG turbocharger, engine out NOx emission can be greatly reduced by 24% without sacrificing fuel economy. For some LIVC, BSFC can even be decreased by 1%.
The reason for the better fuel economy was investigated. It was found that LIVC coupled with the VTG turbocharger moved the operating point to a more efficient region, reducing the fuel consumption. At the same time, the NOx reduction caused by the lower in-cylinder temperature from late intake valve closing was also analyzed in detail. In another investigation, O2 level was found to be important in understanding the NOx reduction benefit.
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Citation
Yang, B. and Keller, P., "Analysis of Diesel Engine Emissions Reduction by Late Intake Valve Close and VTG Turbocharger Using 1-D Simulation," SAE Technical Paper 2008-01-2444, 2008, https://doi.org/10.4271/2008-01-2444.Also In
References
- Murata, Y. Kusaka, J. Odaka, M. Daisho, Y. Kawano, D. Suzuki, H. Ishii, H. Goto, Y. Achievement of Medium Engine Speed and Load Premixed Diesel Combustion with Variable Valve Timing SAE Technical Paper 2006-01-0203 2006
- Sommer, A. Stiegler, L. Wormbs, T. Kabitzke, J. Buschmann, G. Will We Need Variable Valve Trains for Passenger-Car Diesel Engines in the Future? SIA Conference on Variable Valve Actuation November 30 2006 IFP Rueil France
- Walter, B. Pacaud, P. Gatellier, B. Variable Valve Actuation Systems Potential for HCCI or LTC Diesel Combustion SIA Conference on Variable Valve Actuation November 30 2006 IFP Rueil France
- Lancefield, 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
- Kamo, R. Mavinahally, N.S. Kamo, L. Bryzik, W. Reid, M. Emissions Comparisons of an Insulated Turbocharged Multi-Cylinder Miller Cycle Diesel Engine SAE Technical Paper 980888 1998
- Millo, F. Mallamo, F. Mego, G.G. The Potential of Dual Stage Turbocharging and Miller Cycle for HD Diesel Engines SAE Technical Paper 2005-01-0221 2005
- Kook, S. Bae, C. Miles, P. Choi, D. Pickett, L. The Influence of Charge Dilution and Injection Timing on Low-Temperature Diesel Combustion and Emissions SAE Technical Paper 2005-01-3837 2005
- Gamma Technologies GT-Power User Manual July 2007
- He, X. Durret, R. Sun, Z. Late Intake Valve Closing as an Emissions Control Strategy at Tier 2 Bin 5 Engine-Out NOx Level SAE Technical Paper 2008-01-0637 2008