Control device for compression ignition engine

A control device for a compression ignition engine causing fuel injected into a combustion chamber from an injector to combust by compression ignition, comprising:

• an intake-air-temperature sensor configured to acquire an intake air temperature that is a temperature of intake air supplied to the combustion chamber;
• and
• a processor configured to execute a fuel injection controlling module to control an injection amount and an injection timing of the fuel by the injector,
• wherein the fuel injection controlling module causes the injector to perform a pre-injection in which fuel is injected at an advancing side of a compression top dead center, and a main injection in which fuel is injected during combustion of the fuel injected by the pre-injection,
• wherein the fuel injection controlling module sets fuel injection timings of the pre-injection and the main injection so that an interval between a first peak of a heat release rate resulting from the combustion of the fuel injected by the pre-injection and a second peak of the heat release rate resulting from the combustion of the fuel injected by the main injection becomes an interval to make pressure waves caused by the combustions of the fuel of the pre-injection and the main injection cancel each other out, and
• wherein when an increase of the intake air temperature is detected by the intake-air-temperature sensor, the fuel injection controlling module controls the injector to reduce the injection amount of the pre-injection and retard the injection timing of the pre-injection compared with a case where the increase of the intake air temperature is not detected.