Restart control device for internal combustion engine

A restart control device applied to a vehicle which is provided with an internal combustion engine, an electric motor which is connected to an output shaft of the internal combustion engine so that a torque is applied to the output shaft to increase a rotation speed of the internal combustion engine, a driving wheel, a clutch device which is engaged or disengaged to permit or prohibit a power transmission between the output shaft of the internal combustion engine and the driving wheel, and a vehicle speed detector which detects a vehicle speed, the restart control device comprising:

• a computer configured to:
• determine whether a performing condition is established for the vehicle to perform a coasting;
• terminate a fuel supply to the internal combustion engine and disengage the clutch device to perform a coasting of the vehicle when the computer determines that the performing condition is established;
• determine whether a restart condition for restarting the internal combustion engine is established while the vehicle is coasting;
• perform push-start by engaging the clutch device to increase a rotation speed of the internal combustion engine by a driving force generated by the coasting, and reopening the fuel supply to the internal combustion engine to start the internal combustion engine;
• perform start-up by increasing the rotation speed of the internal combustion engine using the electric motor, and reopening the fuel supply to the internal combustion engine to start the internal combustion engine;
• and
• when the computer determines that the restart condition is established:
• try to start the internal combustion engine by the start-up first;
• and
• when the start-up fails in starting the internal combustion engine, start the internal combustion engine by the push-start,
• wherein the push-start includes:
• trying to start the internal combustion engine without any drive assistance of the electric motor when the vehicle speed detected by the vehicle speed detector is higher than a specified speed, and
• trying to start the internal combustion engine with drive assistance of the electric motor when the vehicle speed detected by the vehicle speed detector is lower than the specified speed.

A restart control device applied to a vehicle which is provided with an internal combustion engine, an electric motor which is connected to an output shaft of the internal combustion engine so that a torque is applied to the output shaft to increase a rotation speed of the internal combustion engine, a driving wheel, a clutch device which is engaged or disengaged to permit or prohibit a power transmission between the output shaft of the internal combustion engine and the driving wheel, and a vehicle speed detector which detects a vehicle speed, the restart control device comprising:

• a computer configured to:
• determine whether a performing condition is established for the vehicle to perform a coasting;
• terminate a fuel supply to the internal combustion engine and disengage the clutch device to perform a coasting of the vehicle when the computer determines that the performing condition is established;
• determine whether a restart condition for restarting the internal combustion engine is established while the vehicle is coasting;
• perform push-start by engaging the clutch device to increase a rotation speed of the internal combustion engine by a driving force generated by the coasting, and reopening the fuel supply to the internal combustion engine to start the internal combustion engine;
• perform start-up by increasing the rotation speed of the internal combustion engine using the electric motor, and reopening the fuel supply to the internal combustion engine to start the internal combustion engine;
• and
• when the computer determines that the restart condition is established:
• try to start the internal combustion engine by the push-start first, and
• when the push-start fails in starting the internal combustion engine, start the internal combustion engine by the start-up,
• wherein the push-start includes:
• trying to start the internal combustion engine without any drive assistance of the electric motor when the vehicle speed detected by the vehicle speed detector is higher than a specified speed, and
• trying to start the internal combustion engine with drive assistance of the electric motor when the vehicle speed detected by the vehicle speed detector is lower than the specified speed.