Patent ID: 9488094
Filing Date: 2016-11-08
CPC Classification: F01L,F02B,F02D,F02F,F02P,Y02T

Claim Text:
1. A direct injection gasoline engine having an auto-ignition combustion operation range allowing auto-ignition combustion of fuel injected into a cylinder by an injector and containing at least gasoline, the engine having a geometric compression ratio ranging from 18 to 40, both inclusive, the engine comprising: an injection control section configured to control fuel injection of the injector; and an ignition assistance section configured to apply energy to the fuel injected into the cylinder by the injector to assist the auto-ignition combustion of the fuel, when the engine is within the auto-ignition combustion operation range, wherein when the engine is within the auto-ignition combustion operation range, the injection control section sets a start time of the fuel injection within a period from a terminal stage of a compression stroke to a compression top dead center, and the ignition assistance section applies the energy to the fuel injected into the cylinder in a period from start of the fuel injection to an initial stage of an expansion stroke such that a time of a specific crank angle ranging from 4° CA to 15° CA after the compression top dead center when an increase rate of in-cylinder pressure, which is a ratio of a change in the in-cylinder pressure to a change in a crank angle in motoring the engine, reaches a negative maximum value overlaps a main combustion period when a combustion mass percentage of the fuel ranges from 10% to 90%, both inclusive.