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US 9,869,242 B2Granted
Engine control for catalyst regeneration
AssigneeFord Global Technologies, LLC
InventorsThomas G. Leone, Joseph Norman Ulrey, Mark Allen Dearth
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for injecting water during an engine cylinder deactivation event so as to reduce an exhaust catalyst regeneration requirement following the cylinder deactivation. In one example, water is injected at one or more deactivated engine cylinders to reduce oxidation of the exhaust catalyst. Then, during engine cylinder reactivation, a degree of richness of a combustion air-to-fuel ratio may be reduced to decrease fuel penalty to the engine while reducing NOx emission.
Claims18
An engine method, comprising:
- selectively deactivating one or more engine cylinders via deactivatable fuel injectors;
- during cylinder deactivation, port injecting water on a closed intake valve of the one or more deactivated engine cylinders before the intake valve opens;
- and
- estimating an ammonia content stored in a second exhaust catalyst after engine cylinder reactivation conditions are met.
1 more element
An engine method, comprising:
- selectively deactivating one or more engine cylinders via deactivatable fuel injectors;
- during cylinder deactivation, injecting water at the one or more deactivated engine cylinders to reduce oxygenation of a first exhaust catalyst;
- and
- estimating an ammonia content stored in a second exhaust catalyst after engine cylinder reactivation conditions are met.
1 more element
Dependencies are inferred from the claim text.