Patent ID: 8781710
Filing Date: 2014-07-15
Classification: F02D

Abstract:
1. A system comprising: a sampling module that receives a first mapping of thermal efficiency of a spark-ignition engine generated based on operation of the spark-ignition engine with a dynamometer, wherein a combustion chamber of the spark-ignition engine has a first compression ratio; a map generating module that generates a second mapping of the thermal efficiency of the spark-ignition engine based on the first mapping and the combustion chamber having a second compression ratio, wherein the second compression ratio is different than the first compression ratio, a combustion phasing adjustment module that generates combustion phasing thermal efficiency adjustments based on combustion phasing angles selected during the operation of the spark-ignition engine with the dynamometer to limit engine knock to less than a predetermined maximum level at an engine speed and an engine load, respectively; and an adjusting module that selectively adjusts thermal efficiency points of the first mapping based on the combustion phasing thermal efficiency adjustments, respectively, wherein the map generating module populates the second mapping with the adjusted thermal efficiency points.