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The Modular Engine Concept: a Cost Effective Way to Reduce Pollutant Emissions and Fuel Consuption
Technical Paper
2007-24-0060
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A promising technique to enhance fuel efficiency of large capacity S.I. engines is the de-activation of some cylinders at partial load, through the cut-out of fuel metering and a specific control of the airflow. Thanks to the ensuing reduction of throttling losses (the active cylinders operate at a much higher load), fuel consumption can be reduced, without any negative perception from the driver. Such a technique has been already applied successfully on some production engines, at the cost of some additional complication on the valve-train system.
The application analyzed in this study is a little bit different, being aimed to reduce both fuel consumption and emissions, with a minimum impact on engine design. Larger fuel savings may be obtained by coupling the cylinder de-activation with VVT.
However, the most important advantage of the modular engine concept proposed in this paper is in terms of emissions: this study demonstrates that the light-off time of the catalysts may be strongly reduced, and a further improvement is obtained by doubling the effective surface of the catalytic bed.
The study has been carried out on a conventional SI 4.2L V8 engine. The first step of the analysis has been the experimental validation of a 1D-CFD model of the engine, achieved with a very good accuracy at both full and partial load. Then, the engine has been simulated on a grid of 15 operating points, representing the usage in the New European Driving cycle. The following configurations have been analyzed and compared to the base engine: 4 active cylinders, 3 active cylinders; 4 active cylinders and optimization of valve timings; 3 active cylinders and optimization of valve timings.
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Citation
Mattarelli, E. and Tosetti, F., "The Modular Engine Concept: a Cost Effective Way to Reduce Pollutant Emissions and Fuel Consuption," SAE Technical Paper 2007-24-0060, 2007, https://doi.org/10.4271/2007-24-0060.Also In
References
- Kerr J. 2002 “GM's Displacement on Demand” www.CanadianDriver.com
- www.mitsubishi-motors.co.jp/docs6/history/html
- Jost K. 1999 “Mercedes-Benz launches cylinder cutout” Automotive Engineering International January 38 39
- Jost K. 2003 “Engine strategies and engineering” Automotive Engineering International January 23 24
- Flierl R. Kluting M. “The Third Generation of Valvetrains for Throttle-Free Load Control” SAE Paper 2000-01-1227
- Kreuter P. Heuser P. Reinicke-Murmann J. Erz R. Stein P. Peter U. “Meta - CVD System: An Electro-Mechanical Cylinder and Valve Deactivation System” SAE Paper 2001-01-0240
- Zheng Q. “Characterization of the Dynamic Response of a Cylinder Deactivation Valvetrain System” SAE Paper 2001-01-0669
- Leone T.G Pozar M. “Fuel Economy Benefit of Cylinder Deactivation - Sensitivity to Veichle Application and Operating Constraints” SAE Paper 2001-01-3591
- Yamaguchi J “Engine Advancements from Japan” Automotive Engineering International March 2006 19 20 2006
- Sinz S. “Analisi teorica e sperimentale della disattivazione parziale dei cilindri per la riduzione dei consumi in un motore ad elevate prestazioni” Degree Thesis in Mechanical Engineering University of Modena and Reggio E 2001
- Gamma Technologies 2003 “GT-Power User's Manual. Version 6.1” Westmont, IL, USA
- Heck R.M. Farrauto R.J. 2002 “Catalytic Air Pollution Control: Commercial Technology” 2nd Edition 978-0-471-43624-9