This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
The Heavy Duty Gasoline Engine - A Multi-Cylinder Study of a High Efficiency, Low Emission Technology
Technical Paper
2005-01-1135
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
SwRI has developed a new technology concept involving the use of high EGR rates coupled with a high-energy ignition system in a gasoline engine to improve fuel economy and emissions. Based on a single-cylinder study [1], this study extends the concept of a high compression ratio gasoline engine with EGR rates > 30% and a high-energy ignition system to a multi-cylinder engine. A 2000 MY Isuzu Duramax 6.6 L 8-cylinder engine was converted to run on gasoline with a diesel pilot ignition system. The engine was run at two compression ratios, 17.5:1 and 12.5:1 and with two different EGR systems - a low-pressure loop and a high pressure loop. A high cetane number (CN) diesel fuel (CN=76) was used as the ignition source and two different octane number (ON) gasolines were investigated - a pump grade 91 ON ((R+M)/2) and a 103 ON ((R+M)/2) racing fuel.
The results showed that the stock, 17.5:1 compression ratio (CR) was unsuitable for operation except at light (<50%) loads with the peak BMEP's of 700 kPa on 91 ON fuel and 1000 kPa on 103 ON fuel. The engine-out BSNOx ranged from 0.76 to 2.35 g/kW-hr with brake thermal efficiencies (BTE) between 26-38% over the load range. At 12.5:1 CR, the peak BMEP's were much higher, 1260 kPa on 91 ON and 1720 kPa on 103 ON. The engine-out BSNOx ranged from 0.03 to 2.10 g/kW-hr with BTE's between 23-37% over the load range. With the addition of a 3-way catalyst, made possible by stoichiometric operation, the possibility exists for extremely low emissions at diesel-like fuel economies. These results show that the technology has the potential to return the efficiency of a modern diesel engine (equipped with aftertreatment devices) with the low emissions of a light-duty gasoline engine.
Recommended Content
Authors
Topic
Citation
Alger, T., Hanhe, S., Roberts, C., and Ryan, T., "The Heavy Duty Gasoline Engine - A Multi-Cylinder Study of a High Efficiency, Low Emission Technology," SAE Technical Paper 2005-01-1135, 2005, https://doi.org/10.4271/2005-01-1135.Also In
References
- Roberts, C. et al. 2004 “The Heavy-Duty Gasoline Engine - An alternative to meet emissions standards of tomorrow” SAE Paper 2004-01-0984
- http://www.dieselnet.com/standards/us/hd.html-y2004
- Clean Diesel Independent Review Subcommittee 2002 Meeting Technology Challenges for the 2007 Heavy Duty Highway Diesel Rule
- Charmley, B. Machiele P. 2003 HD 2007 Rule Overview U.E. Presentation
- Callahan, T. Survery of Gas Engine Performance and Future Trends ASME paper ICES2003-628 2003