Fuel injection control system and method of compression ignition internal combustion engine

摘要

A fuel injection control system and fuel injection control method of a compression ignition internal combustion engine which can perform a primary fuel injection and a secondary fuel injection, reduces an actual compression ratio of the compression ignition internal combustion engine when the secondary fuel injection is performed (S103) compared to when the secondary fuel injection is not performed (S104), thereby further increasing the fuel injection quantity per one secondary fuel injection while inhibiting a rise in temperature of the combustion chamber. As a result, the combustion state of the fuel can be stabilized as quickly as possible while the temperature of the combustion chamber can be inhibited from rising too high.