METHOD AND SYSTEM FOR PRE-IGNITION CONTROL

摘要

Methods and systems are provided for mitigating knock and/or pre-ignition. Each of a spark timing retard, cylinder enrichment, and engine load limiting is adjusted based on a knock sensor output generated in a single defined crank angle window, and not based on knock sensor output generated outside the defined crank angle window. A severity of the mitigating actions is adjusted in proportion to the knock sensor output intensity with the severity of the mitigating action increased as the knock sensor output intensity increases.

主权项

1. A method for an engine, comprising:
in response to a knock sensor output intensity occurring within a first window for a given cylinder combustion event, enriching the cylinder as a function of the output intensity; and in response to the knock sensor output intensity occurring within a second window for the combustion event being higher than a threshold, retarding spark ignition, the first window partially overlapping the second window.