Method and system for pre-ignition control

摘要

Methods and systems are provided for reducing late burn induced cylinder pre-ignition events. In response to a late burn combustion event in a cylinder, ignition coil dwell time is extended in the cylinder to reduce unintended combustion delays. In addition, pre-ignition mitigating actions are performed in a neighboring cylinder that may be prone to pre-ignition induced by the late combustion event.

主权项

1. A method for an engine, comprising
in response to timing of combustion in a direct injection fueled cylinder being later than a threshold during a transient over-torque condition, temporarily increasing spark ignition output for the combustion, wherein the cylinder is a first cylinder, and wherein the increasing is performed to reduce a likelihood of pre-ignition in a second cylinder receiving exhaust residuals from the first cylinder.