Internal-combustion engines – Adjustable combustion chamber – Piston in head adjusted
Reexamination Certificate
2001-08-08
2003-05-06
Yuen, Henry C. (Department: 3747)
Internal-combustion engines
Adjustable combustion chamber
Piston in head adjusted
Reexamination Certificate
active
06557503
ABSTRACT:
BACKGROUND OF INVENTION
The present invention relates to high power output, medium speed diesel engines. More particularly, the present invention relates to a method of lowering fuel consumption and nitrogen oxide emissions in two-stroke diesel engines.
High power output, medium speed, two-stroke diesel engines are used in various transportation applications, such as locomotives and marine engines. Among the problems associated with such engines is the level of nitrogen oxide emissions (hereinafter referred to as “NOx”) in two-stroke diesel engines. As NOx emission standards become more stringent, diesel engines of this type must be modified or manufactured to further reduce such emissions.
For existing two-stroke diesel engine designs, particularly for those engines that are currently in use, one approach to meeting emissions requirements is to retard the start of fuel injection. However, fuel timing retard, which is usually performed during engine rebuild, compromises engine performance by reducing fuel efficiency.
Therefore what is needed is a method of reducing NOx emissions for a two-stroke diesel engine while maintaining the fuel efficiency of the engine. This is of particular importance at rated (or full) speed and load.
SUMMARY OF INVENTION
A method of lowering fuel consumption and NO
x
levels in a two-stroke diesel engine having at least one piston disposed in at least one combustion chamber comprises the steps of providing a compression ratio within the combustion chamber between about 16:1 to about 19:1, providing a ratio of peak pressure to compressed pressure within the combustion chamber below about 1.4; and providing a trapped air charge density within the combustion chamber of at least 2.77 kg/m
3
. Combustion within the diesel engine results in NO
x
levels in exhaust gases below a predetermined amount and fuel consumption below a predetermined amount.
REFERENCES:
patent: 4510895 (1985-04-01), Slee
patent: 5522359 (1996-06-01), Collin
patent: 5826563 (1998-10-01), Patel et al.
patent: 6158413 (2000-12-01), Kimura et al.
patent: 6213086 (2001-04-01), Chmela et al.
patent: 6318308 (2001-11-01), Hsu et al.
U.S. patent application S.N. 09/412,627 entitled “Increased Compression Ratio Diesel Engine Assembly For Retarded Fuel Injection Timing”.
Internal Combustion Engine Fundamentals, J.P. Heywood, McGraw Hill, 1988, “Engine Types and Their Operation”, pp. 1-14, 25, 235.
Ali Hyder
Armstrong Teasdale LLP
General Electric Co.
Reeser III Robert B.
Yuen Henry C.
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