The characteristics of fuel lean HCCI operation using a variety of fuels are well known and have been demonstrated using different engine concepts in the past. In contrast, stoichiometric operation of HCCI is less well documented. Recent studies have highlighted the benefits of operating at a stoichiometric condition in terms of load expansion combined with the applicability of three way catalyst technology to reduce NOx emissions. In this study the characterization of stoichiometric HCCI using gasoline-like fuels was undertaken. The fuels investigated are gasoline, a 50 vol% blend of iso-butanol and gasoline (IB50), and an 85% vol blend of ethanol and gasoline (E85). A single cylinder engine operating with direct injection and spark assist combined with a fully variable hydraulic valve actuation system allowed a wide range of operating parameters to be studied. This included the effects of negative valve overlap duration, intake valve closing and valve lift. Furthermore, the interaction between fuel injection timing and spark and how they can affect the required valve timing to achieve stoichiometric HCCI combustion are also studied. A comprehensive combustion and emissions analysis is conducted using gasoline, IB50 and E85 at an engine speed of 2000rpm over a range of operating loads. The resultant fuel properties which differed in terms of octane rating, fuel oxygenation and heat of vaporization show that stoichiometric HCCI is possible using a range of fuels but that these fuel characteristics do have some effect on the combustion characteristics. How these fuel properties can enable an increased engine operating envelope to be achieved, in comparison with both fuel lean HCCI and conventional spark ignited combustion, is then discussed.
Skip Nav Destination
ASME 2011 Internal Combustion Engine Division Fall Technical Conference
October 2–5, 2011
Morgantown, West Virginia, USA
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
978-0-7918-4442-7
PROCEEDINGS PAPER
The Effects of Fuel Characteristics on Stoichiometric Spark-Assisted HCCI
Adam J. Weall,
Adam J. Weall
Oak Ridge National Laboratory, Knoxville, TN
Search for other works by this author on:
James P. Szybist
James P. Szybist
Oak Ridge National Laboratory, Knoxville, TN
Search for other works by this author on:
Adam J. Weall
Oak Ridge National Laboratory, Knoxville, TN
James P. Szybist
Oak Ridge National Laboratory, Knoxville, TN
Paper No:
ICEF2011-60122, pp. 243-259; 17 pages
Published Online:
February 3, 2012
Citation
Weall, AJ, & Szybist, JP. "The Effects of Fuel Characteristics on Stoichiometric Spark-Assisted HCCI." Proceedings of the ASME 2011 Internal Combustion Engine Division Fall Technical Conference. ASME 2011 Internal Combustion Engine Division Fall Technical Conference. Morgantown, West Virginia, USA. October 2–5, 2011. pp. 243-259. ASME. https://doi.org/10.1115/ICEF2011-60122
Download citation file:
15
Views
Related Proceedings Papers
Related Articles
Experimental Investigations of Particulate Size and Number Distribution in an Ethanol and Methanol Fueled HCCI Engine
J. Energy Resour. Technol (January,2015)
Study of Multimode Combustion System With Gasoline Direct Injection
J. Eng. Gas Turbines Power (October,2007)
Experimental Investigation of Direct Fuel Injection Into Low-Oxygen Recompression Interval in a Homogenous Charge Compression Ignition Engine
J. Energy Resour. Technol (January,2022)
Related Chapters
A Simple Carburetor
Case Studies in Fluid Mechanics with Sensitivities to Governing Variables
Later Single-Cylinder Engines
Air Engines: The History, Science, and Reality of the Perfect Engine
Front Matter
Companion Guide to the ASME Boiler & Pressure Vessel Codes, Volume 1 Sixth Edition