This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Experimental Investigations of Intake and Exhaust Valve Timing Effects on Charge Dilution by Residuals, Fuel Consumption and Emissions at Part Load
Technical Paper
2007-01-0478
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Experimental investigations of intake and exhaust valve timing effects at part load have been carried out on a 4 cylinder, 1.6 l spark ignition engine. The effects of valve timing on charge dilution by residual gases, and on fuel consumption and emission characteristics, have been explored. The valve timings, and particularly the duration of the valve overlap period, strongly influence levels of charge dilution. The extent to which this accounts for the observed changes in specific fuel consumption and emissions with valve timings is investigated. Residuals gas fraction values have been determined at various steady operating conditions through the analysis of gas samples drawn from the cylinder near the tip of the spark plug. A gasoline direct injection fuel injector operating in reverse flow was used as a high-speed sampling valve. Brake specific values reflect a combination of changes in dilution and, at different brake loads, changes in pumping work. The patterns of performance mapped out as functions of valve timing are illustrated and explained.
Recommended Content
Authors
Citation
Shayler, P. and Alger, L., "Experimental Investigations of Intake and Exhaust Valve Timing Effects on Charge Dilution by Residuals, Fuel Consumption and Emissions at Part Load," SAE Technical Paper 2007-01-0478, 2007, https://doi.org/10.4271/2007-01-0478.Also In
References
- Hinze P C Miles P C ‘Quantitative Measurements of Residual and Fresh Charge Mixing in a Modern SI Engine Using Spontaneous Raman Scattering’ SAE Paper No 1999-01-1106 , International Congress and Exposition 1999
- Mladek M Onder C H ‘A Model for the Estimation of Inducted Air Mass and the Residual Gas Fraction using Cylinder Pressure Measurements’ Paper No 2000-01-0958 , SAE 2000 World Congress 2000
- Ford R Collings N ‘Measurement of Residual Gas Fraction using a Fast Response NO Sensor’ SAE Paper No 1999-01-0208 1999
- Cho H Lee K Lee J Yoo J Min K ‘Measurements and Modelling of Residual Gas Fraction in SI Engines’ Paper No 2001-01-1910, International Spring Fuels and Lubricants Meeting and Exhibition 2001
- Galliot F Cheng W K Cheng C O Sztenderowicz M Heywood J B Collings N ‘In Cylinder Measurements of Residual Gas Concentration in a Spark Ignition Engine’ SAE Paper No 900485 1990
- Fox J W Cheng W K Heywood J B ‘A Model for Predicting Residual Gas Fraction in Spark-Ignition Engines’ SAE Paper No 931025 , International Congress and Exposition 1993
- Collings N Coghland N Hands T ‘In Cylinder Gas Sampling of IC Engines Using Modified GDI Injectors - the CSV’ JSAE Paper 20055401, JSAE Annual Congress 2005
- Sandquist H Wallesten J Enwald K Stromberg S ‘Influence of Valve Overlap Strategies on Residual Gas Fraction and Combustion in a Spark Ignition Engine at Idle’ SAE Paper No 972936 1997
- Shayler P J Winborn L D Hill M J Eade D ‘The Influence of Gas/Fuel Ratio on Combustion Stability and Misfire Limits of Spark Ignition Engines’ SAE Paper 2000-01-1208 , SAE Congress 2000 Detroit 2000 SAE Publication SP-1517 2000
- Shayler P J Lai W Brown N Harbor N ‘Limits on Charge Dilution Fuel and Air Proportions for Stable Combustion in Spark Ignition Engines’ SAE Paper No 2004-01-4533, SAE Transactions, Journal of Engines 2004