As it is well known, the combustion process in Spark Ignition (SI) engines is strongly affected by the quality and quantity of the fluid within the cylinder at Intake Valve Closing (IVC). Residual gas affects the engine combustion processes (and therefore emissions and performance) through its influence on charge mass, temperature and dilution. Moreover, in Gasoline Direct Injection (GDI) engines, the amount of oxygen in the residual gas may be significant if the engine is operated in stratified charge mode (low loads and speeds), while almost no oxygen may be found in the residual gas during homogeneous-charge operation. In this paper, different approaches to residual gas fraction estimation are analyzed and compared. The main objective is to obtain a simple and reliable model also in presence of Variable Valve Timing (VVT, both on intake and exhaust valves) and External Gas Recirculation (EGR) systems, that could be used to control combustion duration and position. In fact, the two main contributions to residual gas fraction (backflow of the burned gas during the valve overlap period, and amount of gas trapped within the cylinder) are strongly affected by intake and exhaust valves timing, and EGR flow should be taken into account in order to determine the total exhaust gas mass within the cylinder at IVC. Therefore, estimation of residual gas mass and composition is crucial for designing VVT and EGR management strategies, integrated with optimal control of Spark Advance (and therefore of the combustion process). Experimental data have been acquired on a 3.2 liter V6 GDI engine, equipped with intake and exhaust VVT systems. Tests were performed throughout the engine operating range for different combinations of intake and exhaust valve timings, while varying EGR flow.
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ASME 2004 Internal Combustion Engine Division Fall Technical Conference
October 24–27, 2004
Long Beach, California, USA
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
0-7918-3746-7
PROCEEDINGS PAPER
Residual Gas Fraction Estimation for Model-Based Variable Valve Timing and Spark Advance Control Available to Purchase
Nicolo` Cavina,
Nicolo` Cavina
University of Bologna, Bologna, Italy
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Fabrizio Ponti,
Fabrizio Ponti
University of Bologna, Bologna, Italy
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Carlo Siviero,
Carlo Siviero
Magneti Marelli Powertrain, Bologna, Italy
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Rosanna Suglia
Rosanna Suglia
Magneti Marelli Powertrain, Bologna, Italy
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Nicolo` Cavina
University of Bologna, Bologna, Italy
Fabrizio Ponti
University of Bologna, Bologna, Italy
Carlo Siviero
Magneti Marelli Powertrain, Bologna, Italy
Rosanna Suglia
Magneti Marelli Powertrain, Bologna, Italy
Paper No:
ICEF2004-0956, pp. 457-465; 9 pages
Published Online:
December 11, 2008
Citation
Cavina, N, Ponti, F, Siviero, C, & Suglia, R. "Residual Gas Fraction Estimation for Model-Based Variable Valve Timing and Spark Advance Control." Proceedings of the ASME 2004 Internal Combustion Engine Division Fall Technical Conference. ASME 2004 Internal Combustion Engine Division Fall Technical Conference. Long Beach, California, USA. October 24–27, 2004. pp. 457-465. ASME. https://doi.org/10.1115/ICEF2004-0956
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