Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Reexamination Certificate
2006-12-26
2006-12-26
Huynh, Hai (Department: 3747)
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
C123S299000, C123S568140
Reexamination Certificate
active
07152559
ABSTRACT:
Part load operating point for a controlled auto-ignition four-stroke internal combustion engine is reduced without compromising combustion stability through a valve control operative to establish low pressure conditions within the combustion chamber into which fuel and exhaust gases are introduced. Combustion chamber pressures during the intake cycle are controlled lower as engine load decreases. Combusted gases are recirculated into the combustion chamber through a variety of internal and external recirculation mechanizations. A split-injection fuel control is implemented during low part load operation whereas a single-injection fuel control is implemented during intermediate and high part load operation. Split-injections are characterized by lean fuel/air ratios and single-injections are characterized by either lean or stoichiometric fuel/air ratios. Controlled autoignition is thereby enabled through an extended range of engine loads while maintaining acceptable combustion stability and emissions.
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Brown Barry L.
Cleary David J.
Eng James A.
Kuo Tang-Wei
Najt Paul M.
General Motors Corporation
Huynh Hai
Marra Kathryn A.
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