Control method for internal combustion engine

Abstract

A throttle valve 11 that adjusts an amount of air flowing into an intake passage of an internal combustion engine 1 , a fuel injection valve 9 that injects fuel into the internal combustion engine 1 , and a generator-motor 6 that drives the internal combustion engine 1 via a drive belt 5 are controlled by an internal combustion engine control unit 13 . The internal combustion engine control unit 13 opens the throttle valve 11 to a first throttle opening after detecting a request to start the internal combustion engine 1 , then causes the fuel injection valve 9 to inject fuel while maintaining the first throttle opening, and then opens the throttle valve 11 to a second throttle opening that is larger than the first throttle opening.

1 . A control method for an internal combustion engine, comprising the steps of:
 determining whether or not a request to start the internal combustion engine has been issued;   driving a generator-motor that drives the internal combustion engine via a belt after determining that the request has been issued;   opening a throttle valve provided in an intake passage of the internal combustion engine to a first throttle opening;   injecting fuel into the internal combustion engine from a fuel injection valve while maintaining a throttle opening of the throttle valve at the first throttle opening;   stopping the generator-motor; and   opening the throttle valve to a second throttle opening that is larger than the first throttle opening.