Method of controlling valve timing of diesel engine

A method for controlling a valve timing of a common-rail diesel engine equipped with a fuel injection device including an injector having a plurality of intersections between an axis line of the injector and axes of injection holes bored in the injector, wherein the injector injects fuel from the injection holes to a cylinder having an air intake valve configured so that a valve opening timing for opening the air intake valve and a valve closing timing for closing the air intake valve are variable,

• the method comprising a step of:
• controlling the variable valve opening and closing timings of the air intake valve by a valve timing control means based on operating conditions of the engine,
• wherein the air intake valve is normally opened at a normal valve opening timing before a piston in the cylinder comes to a top dead center, and is normally closed at a normal valve closing timing after the piston comes to a bottom dead center, so as to have a certain phase difference between the normal valve opening timing and the normal valve closing timing,
• wherein the valve timing control means advances the variable valve opening and closing timings of the air intake valve to an advanced valve opening timing and an advanced valve closing timing in accordance with a change of an engine rotation number or a load on the engine so as to close the air intake valve at the advanced valve closing timing before the piston comes to the bottom dead center, and so as to keep the certain phase difference between the advanced valve opening timing and the advanced valve closing timing,
• wherein at least one of a detection value of supercharging pressure by a supercharging pressure detecting means, a detection value of intake temperature by a intake temperature detection means, and a detection value of fuel temperature by a fuel temperature detecting means is inputted to the valve timing control means, and
• wherein the valve timing control means controls the variable valve opening and closing timings so that the normal valve closing timing after the piston comes to the bottom dead center can be set in accordance with change of the at least one detection value even if the advanced valve closing timing before the piston comes to the bottom dead center should be set in accordance with change of the engine rotation number or load on the engine.