Automatic stop/restart system for internal combustion engine

An automatic stop/restart system for an internal combustion engine mounted in a vehicle, the automatic stop/restart system being configured to automatically stop the internal combustion engine when predetermined stop conditions are met and automatically restart the internal combustion engine when predetermined restart conditions are met, wherein the vehicle comprises:

• a hydraulic transmission and a parking mechanism, the hydraulic transmission being configured to change power from the internal combustion engine using hydraulic pressure boosted by rotational driving force of the internal combustion engine, the parking mechanism including a locking member and configured to hold the vehicle stationary by locking, with the locking member, the rotation of a power transmitting member when a shift position of a shift operation member of the transmission is in a parking range, the power transmitting member being configured to transmit power between the internal combustion engine and driving wheels, the automatic stop/restart system comprising:
• a shift position detector configured to detect the shift position;
• an inclination angle detector configured to detect, in a forward-and-backward direction of the vehicle, an inclination angle of the vehicle with the vehicle being stationary;
• a brake operating state detector configured to detect an operating state of a brake of the vehicle;
• and
• a restart controller configured to perform control in such a manner that in a case when, in an automatic stop state of the internal combustion engine, the detected shift position of the shift operation member is in the parking range and the detected operating state of the brake is turn-off operation,
• the internal combustion engine is restarted when the detected inclination angle is greater than or equal to a predetermined value and
• the automatic stop state of the internal combustion engine is maintained when the detected inclination angle is smaller than the predetermined value.