Abstract: When starting of an in-cylinder injection engine 1 is detected, a cylinder discrimination, which discriminates each cylinder, is effected. After each cylinder is discriminated, it is determined whether or not a water temperature detected by a water temperature sensor 16 exceeds a predetermined value. When the water temperature is below the predetermined value, fuel injection is started from the fuel injection valve 4 of a cylinder subjected to at least one compression stroke. Thereby, the cylinder discrimination is effected quickly, and it is made possible to raise the temperature within the combustion chamber 5, by means lapse of at least one compression stroke, at low water temperatures at which the starting ability tends to be deteriorated, and the starting ability of the in-cylinder injection engine 1 at low water temperatures is improved while shortening the starting time.

Abstract: This invention relates to a fuel injection control system for an in-cylinder injection internal combustion engine. The system is provided with a fuel injection valve (1) arranged at a cylinder for injecting fuel into the cylinder, fuel feed pressure setting unit (121) for setting a fuel injection pressure of the fuel injection valve (1) at a low pressure in a specific operation state including a start-up of the internal combustion engine and for setting said fuel injection pressure at a high pressure in an operation state other than the specific operation state, and fuel injection controller (120) for setting an injection period of the fuel injection valve (1) as a period longer than a period of a single stroke in an operation cycle of the internal combustion engine in the specific operation state.