Patent 7545613 was granted and assigned to Takata Corporation on June, 2009 by the United States Patent and Trademark Office.
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. The motor is stopped when the rate of increase in the electricity exceeds a predetermined rate and when the electricity exceeds a predetermined value, respectively.