Method and system for pre-ignition control

摘要

Methods and systems are provided for addressing cylinder pre-ignition. Each cylinder of an engine may be operated in either a split injection mode or a single injection mode based on the pre-ignition history of the cylinder. The timing and number of injections in the split injection mode is adjusted based on the pre-ignition count of the cylinder.

主权项

1. An engine system, comprising,
an engine including a first cylinder with a first, higher pre-ignition count and a second cylinder with a second, lower pre-ignition count; a direct fuel injector configured to direct inject fuel into the first and/or the second cylinder; and a controller with computer readable instructions for,
operating the first cylinder in a split injection mode to rich inject fuel in the first cylinder; andoperating the second cylinder in a single injection mode to lean inject fuel in the second cylinder.