Patent ID: 8607564

Claim:
A method of controlling an automobile-mount diesel engine with a turbocharger, the engine being supplied with fuel containing diesel fuel as a main component, comprising: a. when the engine is within a range where a load is relatively low within a predetermined operating range where a rotation speed is low and the load is partial, the method including: switching to a first injection mode that includes introducing EGR gas into a cylinder of the engine; performing a main injection where the fuel is injected at or near a top dead center in a compression stroke to cause a main combustion that mainly includes a diffusion combustion; and performing a pre-stage injection where the fuel is injected prior to the main injection according to a predetermined injection ratio with respect to a fuel injection amount of the main injection; and b. when the engine is within a range where the load is relatively high within the predetermined operating range, the method including: switching to a second injection mode that includes introducing the EGR gas into the cylinder of the engine, performing the main injection, performing the pre-stage injection with an injection ratio lower than an injection ratio in the first injection mode, and performing a post-stage injection where the fuel is injected after the main injection to extend the main combustion; and c. when the engine is at a timing in which the injected fuel reaches outside a cavity formed in a top surface of a piston, the method including: partially performing the post-stage injection.