Patent ID: 7281509

Claim:
An internal combustion engine system including an internal combustion engine that is equipped with an in-cylinder fuel injection valve for in-cylinder injection of a fuel, said internal combustion engine system comprising: a pressurization supply unit that pressurizes the fuel and supplies the pressurized fuel to the in-cylinder fuel injection valve at a start of the internal combustion engine; a fuel pressure measurement sensor that measures a pressure of the fuel supplied to the in-cylinder fuel injection valve; an in-cylinder compression pressure detection estimation module that either detects or estimates an in-cylinder compression pressure as an in-cylinder pressure in a compression process of the internal combustion engine; a cranking module that cranks the internal combustion engine; and a start control module that, in response to a start instruction of the internal combustion engine, controls the cranking module to crank the internal combustion engine, while controlling the in-cylinder fuel injection valve to start fuel injection from the in-cylinder fuel injection valve, after the fuel pressure measured by the fuel pressure measurement sensor reaches a preset first pressure, which is determined according to the in-cylinder compression pressure either detected or estimated by the in-cylinder compression pressure detection estimation module and a closed valve position-retaining pressure for keeping the in-cylinder fuel injection valve in a closed position.