Patent ID: 8170778

Claim:
A control method of an internal combustion engine system including an internal combustion engine equipped with a port fuel injection valve arranged to inject a fuel into an intake port and with an in-cylinder fuel injection valve arranged to directly inject the fuel into each cylinder, the control method comprising: on completion of learning under fuel injection from the port fuel injection valve in a specified operation state of the internal combustion engine, setting a first temperature to an auto stop-permitting water temperature that allows an auto stop of the internal combustion engine, and on incompletion of the learning, setting a second temperature that is higher than the first temperature to the auto stop-permitting water temperature; and automatically stopping operation of the internal combustion engine upon satisfaction of preset auto stop conditions including a condition that temperature of cooling water in the internal combustion engine is not lower than the set auto stop-permitting water temperature and automatically restarting the operation of the internal combustion engine upon satisfaction of preset auto restart conditions in an auto stop state of the internal combustion engine.