This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
SI-HCCI-SI Mode Transition at Different Engine Operating Conditions
Technical Paper
2005-01-0156
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The homogeneous charge compression ignition-HCCI (also to be known as controlled auto ignition-CAI) engine concept has the potential to be highly efficient and to produce low NOx, carbon dioxide and particulate matter emissions. It experiences, however, problems with cold start, running at idle and high loads that together with controlling the combustion over the entire speed/load range limits its practical application. A solution to overcome these problems is to operate the engine in ‘hybrid mode’, where the engine operates in HCCI mode at low, medium and cruising loads and switch to spark ignition (SI) mode (or diesel mode-CI) at a cold start, idle and higher loads.
To operate such ‘hybrid mode’ engine, a transition between SI and HCCI and SI modes, as a result of changes in engine speed and load must be seamless in operation, whilst keeping all relevant engine and combustion parameters in an acceptable range.
A successful transition strategy has to compensate changes in the fuelling rate (and hence in the charge composition) that occurs with different loads, and changes in the time available for the gas exchange process (as a consequence of different) at different engine speeds. The problem is even more exacerbated with the fact that HCCI combustion is controlled by the charge temperature, composition and pressure and therefore the use of a direct control mechanism such as in the SI combustion is not applicable.
The exhaust gas recirculation (EGR), obtained by trapping residual gases inside the cylinder appears to have the potential to enable fast and smooth transition from SI to HCCI to SI, and to provide, in the certain range, control for the HCCI combustion.
The aim of this paper is to present the development and investigation of using TRG, obtained by the Fully Variable Valve Timing (FVVT) system, for a transition from SI to HCCI to SI mode at different engine speeds and loads. The experiment is performed on a single cylinder research camless engine (equipped with the FVVT system) fuelled with commercially available gasoline fuel (95 ON). The results obtained show that different parameters such as the valve profile, throttle position, fuelling rate and spark timing have the major influence on the quality of transition and subsequent operations in HCCI and SI mode. The results also indicate that at different engine operating points (speed and load) different controlling parameters have to be adjusted accordingly.
Recommended Content
Authors
Topic
Citation
Milovanovic, N., Blundell, D., Gedge, S., and Turner, J., "SI-HCCI-SI Mode Transition at Different Engine Operating Conditions," SAE Technical Paper 2005-01-0156, 2005, https://doi.org/10.4271/2005-01-0156.Also In
Homogeneous Charge Compression Ignition (HCCI) Combustion 2005
Number: SP-1963; Published: 2005-04-11
Number: SP-1963; Published: 2005-04-11
Homogeneous Charge Compression Ignition (HCCI) Combustion on CD-ROM from the SAE 2005 World Congress
Number: SP-1982CD; Published: 2005-04-11
Number: SP-1982CD; Published: 2005-04-11
References
- Onishi S. Jo S.H. Shoda K. Jo P.D. Kato S. Thermo-Atmosphere Combustion (ATAC)-A new Combustion Process for Internal combustion Engines SAE Paper 790501 1979
- Hultquivst A. Endar U. Johanson B. Klihgmann J. Reacting Boundary Layers in Homogeneous Charge Compression Ignition (HCCI) Engine SAE Paper 2001-01-1032 2001
- Hultquivst A. Christensen M. Johanson B. Richter M. Nygren J. Hult J. Alden M. The HCCI Combustion Process in a Single Cycle-High Fuel Tracer LIF and Chemiliuminescence Imaging SAE Paper 2002-01-0424 2002
- Ishibashi Y. Isomura S. Kudo O. Tsushima Y. Improving the Exhaust Emissions of Two-Stroke Engines by Applying the Activated Radical Combustion SAE Paper 960742 1996
- Blundell D. Turner J. Duret P. Lavy J. Oscarsson J. Emanuelsson G. Bengtsson J. Hammarstrom T. Perotti M. Kenny R. Cunningham G. Design and Evaluation of the ELEVATE two-stroke automotive engine SAE Paper 2003-01-0403 2003
- Yanagihara, H. Satou, Y. Mizuta J. A Simultaneous Reduction of NOx and Soot Diesel Engines under a New Combustion System (Uniform Bulky Combustion System-UNIBUS) 17 th Int. Vienna Motor Symposium 1996
- Kimura S. Aoki O. Ogawa H. Muranaka S. Enomoto Y. New Combustion Concept for Ultra-Clean and High-Efficiency Small DI Diesel Engines SAE Paper 1999-01-3681 1999
- Koopmans, L. Denbratt I. A Four Stroke Camless Engine, Operated in Homogeneous Charge Compression Ignition Mode with Commercial Gasoline SAE Paper 2001-001-3610 2001
- Koopmans L. Strom H. Lundgren S. Backlund O. Denbratt I. Demostrating a SI-HCCI-SI Mode Change on a Volvo 5-Cylinder Electronic Valve Control Engine SAE Paper 2003-01-0753 2003
- Milovanovic N. Chen R. Turner J. Influence of the Variable Valve Timing on the Gas Exchange Process in a Controlled Auto Ignition (HCCI) Engine Proceedings of the IMECHE Part D: Journal of Automobile Engineering 218 5 567 583 2004
- Brustle C. Schwarzenthal D. VarioCam Plus-A Highlight of the Porsche 911 Turbo Engine SAE Paper 2001-01-0245 2001
- Turner J. Blundell D. Bassett M. Pearson R. Chen R. The Impact on Engine of Controlled Auto Ignition versus Spark Ignition with two Methods of Load Control Proceedings of the Global Powertrain Conference (GPC) Michigan, USA 2002
- Schausberger C. Bachmann P. Borgmann K. Hofmann R. Liebl J. The new BMW Otto Engine Generation Proceedings Aachener Kolloquium Fahrzeug und Motorentechnik Germany 2001
- Sugimoto C. Sakai H. Umemoto A. Shimizu Y. Ozawa H. Study on Variable Valve Timing
- Koopmans L. Backlund O. Denbratt I. Cycle to Cycle Variations: Their Influence on Cycle Resolved Gas Temperature and Unburned Hydrocarbons from a Camless Gasoline Compression Ignition Engine SAE Paper 2002-01-0110 2003
- Hongming X. Rudolph S. Liu Z. Wallace S. Richardson S. Wyszynski M. Megaritis A. An Investigation into the Operating Mode Transitions of a HCCI Engine Using EGR Trapping SAE 2004-01-1911