Being control manner of the sheet belt take-up which possesses the feature which

摘要

PROBLEM TO BE SOLVED: To provide a control device of a seat belt retracting device with a motor allowing reliable retraction in a normal state and giving no oppressive feeling when a part of the body of an occupant is caught by a seat belt.;SOLUTION: When a command for driving a seat belt retractor with the motor 5 is given to a motor control circuit 6, the motor control circuit 6 starts power supply to the motor 5 and puts a clutch 3 into a state of connecting the seat belt retractor 1 and a reduction gear 4. Electric current supplied to the motor 5 is detected by a current detection circuit 7 and is fed back to the motor control circuit 6. The motor control circuit 6 reads out a current value detected by the current detection circuit 7 at predetermined time intervals and calculates a difference value from the value previously read. The power supply to the motor 5 is stopped when the difference value of electric current exceeds a predetermined threshold.;COPYRIGHT: (C)2005,JPO&NCIPI