Engine with cylinder deactivation
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United States of America Patent
Stats
-
Feb 15, 2000
Grant Date -
N/A
app pub date -
Aug 25, 1998
filing date -
Aug 26, 1995
priority date (Note) -
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status (Latency Note)
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Abstract
A multi-cylinder spark ignition internal combustion engine is described having two banks of cylinders 10a, 10b. One bank of cylinders may be selectively disabled by cutting off its fuel supply while continuing to receive air. The exhaust system includes an NO.sub.x trap 20 to store NO.sub.x gases while the exhaust gases contain excess air. During part load operation, the engine is run with one bank of cylinders disabled most of the time during which NO.sub.x gases are stored in the NO.sub.x trap 20. In order to permit the trap 20 to be regenerated or purged periodically, both bank are fired at is the same time for short intervals to supply a stoichiometric or reducing mixture to the exhaust system.
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