Internal-combustion engines – Accessories – Covers – trays – vibrators – corrosion inhibitors – air filters
Reexamination Certificate
2008-02-01
2009-11-24
Cronin, Stephen K (Department: 3747)
Internal-combustion engines
Accessories
Covers, trays, vibrators, corrosion inhibitors, air filters
C123S1980DB, C123S481000
Reexamination Certificate
active
07621252
ABSTRACT:
A method of transitioning an engine to a cylinder deactivation mode may include determining a ratio of time that the engine is operating in the cylinder deactivation mode for an engine operating condition relative to a total time of engine operation in the operating condition, determining a number of transitions from a full cylinder mode to the cylinder deactivation mode during the operating condition, determining a transition modifier based on the ratio and number, and modifying a transition criterion based on the transition modifier.
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Beggs William S
Spitza, Jr. Alfred E.
Wong Kevin C.
Cronin Stephen K
GM Global Technology Operations Inc.
Hamaoui David
Harness & Dickey & Pierce P.L.C.
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