CYLINDER INJECTION OF FUEL-TYPE INTERNAL COMBUSTION ENGINE

摘要

A fuel injection valve 60 of a fuel direct injection internal combustion engine E injects an air-fuel mixture into a cavity 51 of a piston 5 so that an outer periphery 63a of an injection flow 63 is in the cavity 51 during the compression stroke. By cooperation of a squish area 54 formed on a peripheral portion 53 of the piston 5 and a squish area 34 formed on a ceiling surface 30 of a cylinder head 3 to define a combustion chamber 8, an oblique squish 20 is generated which is directed obliquely upward above the peripheral portion 53 toward an injection center axis L4 and which flows along an opposed portion 30a of the ceiling surface 30, which is located upward of and opposes the opening of the cavity 51. Due to the above structural feature, improvement in specific fuel consumption and exhaust emission is achieved by preventing or suppressing diffusion and separation of the air-fuel mixture due to a squish effect.