Automatic stop/ start-up controlling device of an engine

A vehicle comprising an internal combustion engine, a transmission connected to an output shaft of the engine through a clutch, a motor generator connected to the output shaft of the engine and disposed between said engine and said clutch, and an automatic stop/start-up controlling device which (1) automatically stops the engine when an automatic stop condition is satisfied while the engine is driven;

• (2) performs a fuel cut when a deceleration condition is satisfied;
• and (3) automatically starts up the engine when an automatic start-up condition is satisfied while the engine is automatically stopped,
• wherein the automatic stop condition is satisfied when (1) an idle switch is on, (2) a gear position of said transmission is in neutral and (3) the vehicle velocity is less than a predetermined velocity;
• wherein the deceleration condition is satisfied when (1) the idle switch is on, (2) the vehicle speed is less than a set value and (3) the transmission is in a gear position, the set value being different for each of the gear positions;
• and wherein the automatic start-up condition is satisfied when (1) said clutch is changed to a disengaged state from a fully or half engaged state or (2) the gear position of said transmission is shifted to a non-neutral state or (3) the idle switch is off or (4) a predetermined condition of booster negative pressure is obtained.