WATER INJECTION FOR CATALYST OXYGEN REDUCTION AND TEMPERATURE CONTROL DURING TRANSIENT EVENTS

摘要

Methods and systems are provided for injecting water based on duration of cylinder deactivation, and exhaust catalyst temperature during an engine cylinder deactivation event so as to reduce an exhaust catalyst regeneration requirement following the cylinder deactivation, and to prevent catalyst degradation.

主权项

1. An engine method, comprising:
selectively deactivating one or more engine cylinders via deactivatable fuel injectors during a transmission event; and during the cylinder deactivation, injecting water at the one or more deactivated engine cylinders to reduce oxygenation of a first exhaust catalyst.