초록 ▼

A compression-ignition type engine in which fuel is injected in a combustion chamber during the compression stroke or intake stroke before 60 degrees before top dead center of the compression stroke and in which the mean particle size of the fuel injected at that time is made a size in which the tem

A compression-ignition type engine in which fuel is injected in a combustion chamber during the compression stroke or intake stroke before 60 degrees before top dead center of the compression stroke and in which the mean particle size of the fuel injected at that time is made a size in which the temperature of the particles reaches the boiling point of the main ingredient of the fuel, determined by the pressure in the combustion chamber, at substantially the top dead center of the compression stroke. At least when the engine is operating under a heavy load, the EGR ratio is made more than 40 percent and the air excess ratio is made approximately 1.0.

대표청구항 ▼

[ I claim:] [1.] A compression-ignition type engine having a combustion chamber, an intake passage, and an exhaust passage, said engine comprising:injection means for injecting fuel in the combustion chamber and forming fuel droplets diffused in the combustion chamber, the mean value of the particle

[ I claim:] [1.] A compression-ignition type engine having a combustion chamber, an intake passage, and an exhaust passage, said engine comprising:injection means for injecting fuel in the combustion chamber and forming fuel droplets diffused in the combustion chamber, the mean value of the particle size of said fuel droplets being larger than a predetermined particle size at which the temperature of the fuel droplets having said predetermined particle size reaches a boiling point of a main ingredient of said fuel, which boiling point is determined by pressure in the combustion chamber, at about the top dead center of the compression stroke;injection time control means for controlling said injection means to carry out an injecting operation by said injection means at a predetermined timing during a period from the start of an intake stroke to approximately 60 degrees before top dead center of the compression stroke;an exhaust gas recirculation passage interconnecting the exhaust passage to the intake passage; andexhaust gas recirculation control means for controlling an amount of exhaust gas recirculated to the intake passage from the exhaust passage to make an exhaust gas recirculation ratio more than approximately 40 percent at least when the engine is operating under a heavy load.