Patent ID: 7664594

Claim:
A starting system of an internal combustion engine, comprising a combustion chamber, an intake port and an exhaust port that communicate with the combustion chamber, an intake valve and an exhaust valve that open and close the intake port and the exhaust port, respectively, comprising: a throttle device provided in an intake passage that communicates with the intake port, the throttle device comprising a throttle valve: fuel injecting means for injecting fuel into the combustion chamber igniting means for igniting an air/fuel mixture in the combustion chamber; crank angle sensing means for detecting a crank angle of the internal combustion engine; and control means for operating the throttle device to open the throttle valve to a predetermined throttle opening at a throttle opening speed that is set based on an intake pressure during stopping of the engine, and for determining an expansion-stroke cylinder that is in an expansion stroke at the time of a start of the engine, based on the result of detection of the crank angle sensing means wherein when the engine starts, the control means operates the fuel injecting means to inject the fuel into the expansion-stroke cylinder, and operates the igniting means to ignite the air/fuel mixture in the combustion chamber of the expansion-stroke cylinder.