Patent ID: 7509944

Claim:
An engine fuel supply method comprising: driving a high-pressure fuel pump to pneumatically transport high-pressure fuel to a fuel pipe; controlling a fuel pneumatic transportation amount of the high-pressure fuel pump to adjust a fuel pressure in the fuel pipe to a predetermined pressure; simultaneously determining a first fuel injection amount for a first fuel injection and a second fuel injection amount for a second fuel injection, which is performed after the first fuel injection, at a fuel injection amount computation timing based on the fuel pressure in the fuel pipe and an operating condition of an engine; estimating a first fuel pressure difference between the fuel injection amount computation timing and a first fuel injection timing for the first fuel injection and a second fuel pressure difference between the fuel injection amount computation timing and a second fuel injection timing for the second fuel injection at the fuel injection amount computation timing based on a control state of the fuel pneumatic transportation amount of the high-pressure fuel pump; correcting the first fuel injection amount based on the first fuel pressure difference; and selectively controlling a fuel injection valve connected with the fuel pipe to supply the high-pressure fuel directly into a cylinder of the engine at the first fuel injection timing with the corrected first fuel injection amount; correcting the second fuel injection amount based on the second fuel pressure difference; and selectively controlling the fuel injection valve to supply the high-pressure fuel directly into the cylinder of the engine at the second fuel injection timing with the corrected second fuel injection amount.