Method and system for pre-ignition control

摘要

Methods and systems are provided for pre-ignition control. A pre-ignition mitigating enrichment is deactivated in response to a tip-out but reactivated in response to a subsequent tip-in. By preemptively enriching the engine, repeated pre-ignition due at subsequent tip-ins is reduced.

主权项

1. A method for an engine, comprising:
during a tip-in, in response to an indication of pre-ignition, enriching the engine until a subsequent tip-out; and if a number of enrichment cycles between the tip-in and the tip-out is lower than a threshold, enriching the engine during a subsequent tip-in.