SYSTEMS AND METHODS FOR STOPPING AND STARTING AN ENGINE WITH DEDICATED EGR

摘要

Methods and systems are provided for operating an engine including a DEGR system during start-stop and DFSO conditions. In one example, the DEGR cylinder may be deactivated prior to deactivating the non-DEGR cylinder group and stopping the engine, to purge EGR from the intake system.

主权项

1. A method for operating an engine, comprising:
deactivating a dedicated EGR (DEGR) cylinder group of a multi-cylinder engine in response to an imminent engine shutdown condition and prior to deactivating a non-DEGR cylinder group to purge EGR from an intake system; monitoring an EGR amount after deactivating; and deactivating the non-DEGR cylinder group and shutting down the engine in response to the monitored EGR amount falling below a threshold.