METHOD AND SYSTEM FOR PARTICULATE MATTER CONTROL

摘要

Methods and systems are provided for particulate matter control in an engine configured for skip-fire operation. A cylinder pattern selected for selective cylinder deactivation, including a total number of deactivated/active cylinders as well as individual deactivated cylinder identities, may be adjusted based on an engine soot load, or a parameter indicative of engine soot load such as engine coolant temperature. In addition, reactivated engine cylinders may be transiently operated with split fuel injection to raise combustion surface temperatures.

主权项

1. A method for an engine, comprising:
deactivating a first cylinder pattern of individual cylinder valve mechanisms at a first engine soot load; and deactivating a second, different, cylinder pattern of individual cylinder valve mechanisms at a second, higher, engine soot load.