Method of controlling seatbelt retracting device with motor
View Patent ↗In controlling a seatbelt retracting device having a mechanism for retracting a seatbelt with a motor, a current flowing to the motor is detected, and a rate of increase in the current is calculated. When the rate of increase exceeds a predetermined value, the motor is stopped. When the current exceeds a predetermined value, the motor is stopped as well.
1. A method of controlling a seatbelt retracting device with a motor, comprising:
supplying electricity to a motor for retracting a seatbelt,
detecting the electricity flowing to the motor for retracting the seatbelt at a predetermined interval,
calculating a difference with respect to a value read previously to find a rate of increase in the electricity,
awaiting a predetermined period since the electricity is supplied to the motor, and
starting to control the motor including stopping the motor when the rate of increase of the electricity exceeds a predetermined rate.
2. A method of controlling a seatbelt retracting device according to claim 1 , wherein said stopping the motor is also made when the electricity flowing to the motor exceeds a predetermined value.
3. A method of controlling a seatbelt retracting device according to claim 1 , wherein said electricity is current.
4. A method of controlling a seatbelt retracting device according to claim 1 , wherein said motor is connected to the seat belt through a clutch, said motor and clutch being controlled by a control circuit.
5. A method of controlling a seatbelt retracting device according to claim 1 , wherein said predetermined time since the electricity is supplied to the motor is a substantial period until an acceleration of the motor is completed.