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A Four Stroke Camless Engine, Operated in Homogeneous Charge Compression Ignition Mode with Commercial Gasoline
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 24, 2001 by SAE International in United States
Annotation ability available
Event: SAE 2002 World Congress & Exhibition SAE International Fall Fuels & Lubricants Meeting & Exhibition
A single cylinder, naturally aspirated, four-stroke and camless (Otto) engine was operated in homogeneous charge compression ignition (HCCI) mode with commercial gasoline. The valve timing could be adjusted during engine operation, which made it possible to optimize the HCCI engine operation for different speed and load points in the part-load regime of a 5-cylinder 2.4 liter engine.
Several tests were made with differing combinations of speed and load conditions, while varying the valve timing and the inlet manifold air pressure. Starting with conventional SI combustion, the negative valve overlap was increased until HCCI combustion was obtained. Then the influences of the equivalence ratio and the exhaust valve opening were investigated. With the engine operating on HCCI combustion, unthrottled and without preheating, the exhaust valve opening, the exhaust valve closing and the intake valve closing were optimized next. Finally, with three valve timing events, an HCCI operational window was identified.
Using only three valve timing events, an engine operational window for HCCI combustion was obtained with: a maximum load of about 3.5 bar, a minimum load of about 0.1 bar, a maximum speed about 3000 rpm, and a minimum speed about 1200 rpm. The window for HCCI combustion is restricted by zones of knock (on the high load part) and by cycle to cycle variations in cylinder pressure (on the low load part) at high and low engine speeds. Between HCCI combustion and conventional SI combustion, there is a transient interval during which a spark triggers the auto ignition. A clear benefit in reduced CO emissions, NOx emissions (close to zero), and fuel consumption was observed during HCCI engine operation, compared with conventional SI combustion whereas the level of hydrocarbon emissions was approximately the same. The EVC has the greatest influence on the HCCI auto-ignition delay for the engine operating parameters tested. The influence of EVO is controlled by the gas dynamics and IVC has only a minor effect on engine behavior.
CitationKoopmans, L. and Denbratt, I., "A Four Stroke Camless Engine, Operated in Homogeneous Charge Compression Ignition Mode with Commercial Gasoline," SAE Technical Paper 2001-01-3610, 2001, https://doi.org/10.4271/2001-01-3610.
Homogeneous Charge Compression Ignition (Hcci) Combustion 2002
Number: SP-1688; Published: 2002-03-04
Number: SP-1688; Published: 2002-03-04
- Lohmann - Single Diesel Technology for everyone 16 1952
- Alperstein, M. Swim, W.B. Schweitzer, P.H. “Fumigation Kills Smoke - Improves Diesel Performance” SAE Transanctions 66 574 588 1958
- Onishi, S. Jo, S.H. Shoda, K. Jo, P.K. Kato, S. “Active Thermo-Atmospheric Combustion (ATAC) - A new Combustion Process for Internal Combustion Engines” SAE Technical Paper Series, SAE paper 790501 1979
- Yunick, S. “Smokey's New Hot Air Engine⋯.The Next Step” Hot Rod June 1984
- Thring, R.H. “Homogeneous-Charge Compression Ignition Engines” SAE Technical Paper Series, SAE paper 892068 1989
- Asai, M. Kurosaki, T. Okada, K. “Analysis on fuel economy improvement and exhaust emission reduction in a two-stroke engine by using an exhaust valve” SAE Technical Paper Series, SAE paper 951764 1995
- Kerkau, M. Denbratt, I. Rydqvist “Valve Timing for Internal Combustion Engines” 1999
- Denbratt, I. “Method of controlling the process of combustion in an internal combustion engine, and engine with means for controlling the engine valves” Volvo Car Corp. 1999
- Willand, J Nieberding, R.-G. Vent, G. Enderle, C. “The knocking syndrome - its cure and its potential” SAE Technical Paper Series, SAE paper 982483 1998
- Smith, J.R. Aceves, S.M. Westbrook, C. Pitz, W. “Modeling of Homogeneous Charge Compression Ignition (HCCI) of Methane” Proceedings of the 1997 ASME International Combustion Engine Fall Technical Conference, Paper No. 97-ICE-68 29-3 85 90
- Aceves, A.M. Smith, J.R. Westbrook, C.K. Pitz, W. “Compression Ratio Effect on Methane HCCI Combustion” ASME Journal of Gas Turbines and Power 121 569 574 1999
- Denbratt, I. “Method of controlling the process of combustion in an internal combustion engin, and engine with means for varying the effective compression ratio of the cylinders” Volvo Car Corp. 1999
- Kistler “Quartz Pressure Sensor 6123, 6123A1, 6123A2” 7-97 1 2
- Heywood, J.B. “Internal Combustion Engine Fundamentals” Mc Graw-Hill, Inc. New York 1988
- Ishibashi, Y. Asai, M. “Improving the Exhaust Emissions of Two-Stroke Engines by Applying the Activated Radical Combustion” SAE Technical Paper Series, SAE paper 960742 1996
- Umetri “Experimental Design and Modeling” Course literature Umetri AB 1996