Patent ID: 7311080

Claim:
An idle rotational speed controller of an internal combustion engine including an intake path for sucking air to be supplied to a combustion chamber of the internal combustion engine, a throttle valve arranged at the intake path for controlling an intake amount, an auxiliary intake path for communicating the intake path on an upstream side of the throttle valve and the intake path on a downstream side of the throttle valve, and an opening/closing type control valve arranged at the auxiliary intake path for controlling an idling intake amount, the idle rotational speed controller comprising: an intake pressure detecting unit for detecting an intake pressure of the intake path; a fuel supplying unit for controlling a supply amount of a fuel supplied to the combustion chamber based on at least the intake pressure; and a controlling unit for synchronizing a drive reference position for driving to open or close the control valve with a timing of detecting the intake pressure by the intake pressure detecting unit.