Starter motor control during automatic engine stop

摘要

An internal combustion engine is provided with a ratchet one-way clutch between an output shaft of a starting motor and a crankshaft. The one-way clutch includes a claw piece which rotates integrally with the crankshaft, and an engagement part which rotates integrally with the starting motor and with which the claw piece engages. An electronic control device performs control for driving the starting motor when the engine is stopped to reduce the difference between the rotation speed of the engine and the rotation speed of the starting motor, that is, the difference between the rotation speed of the claw piece and the rotation speed of the engagement part.

主权项

1. A controller for a vehicle-mounted internal combustion engine including a ratchet type one-way clutch disposed between an output shaft of an engine cranking motor and an engine output shaft, the one-way clutch including: (i) a hook configured to rotate in cooperation with the engine output shaft about a rotation axis of the engine output shaft, and (ii) an engagement portion configured to rotate in cooperation with the output shaft of the motor about the rotation axis of the engine output shaft and to engage the hook, the hook being configured to move away from the engagement portion as a centrifugal force acting on the hook increases, the controller comprising:
a control unit configured to:
determine whether an engine stop command has been output, anddecrease a deviation degree between a rotation speed of the hook and a rotation speed of the engagement portion when determining that the engine stop command has been output.