CONTROL SYSTEM FOR DIESEL ENGINE, DIESEL ENGINE, AND CONTROL METHOD FOR DIESEL ENGINE

A control system for a diesel engine including a turbocharger and a supercharger as superchargers, includes: a clutch control unit for switching a state of engagement or disengagement of a clutch interposed between the supercharger and a drive shaft of the engine; a fuel injection period control unit for controlling a fuel injection period with respect to the engine based on first association information in which a rotation speed of the engine, an accelerator position, and the fuel injection period are associated with each other in advance; and a fuel injection start timing control unit for controlling a fuel injection start timing with respect to the engine. The fuel injection start timing control unit is configured to control the fuel injection start timing based on association information which is different depending on an operating state of the supercharger.