FIELD: internal combustion engines.
SUBSTANCE: invention relates to methods and systems for addressing pre-ignition occurring in an engine operating with blow-though air delivery. Variable cam timing device used to provide positive intake to exhaust valve overlap is adjusted in response to an indication of pre-ignition to transiently reduce valve overlap. Pre-ignition mitigating load limiting and enrichment applied during a blow-through mode is adjusted differently from those applied when blow-through air is not being delivered.
EFFECT: technical result is the prevention of pre-ignition.
19 cl, 8 dwg
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