Patent ID: 9067554
Filing Date: 2015-06-30
Classification: B60R

Abstract:
1. A seat belt control device which controls a motor which winds up a seat belt, the seat belt control device comprising: a storage which stores a heat generation counter value which represents a temperature variation state of at least one of the motor and a motor driver for driving the motor; a counter which makes an addition/subtraction of a specified value to/from the heat generation counter value based on operation of the motor driver; a decider which decides whether or not to shift from a normal operation mode, in which operating power is supplied to the seat belt control device, to a sleep mode which has a lower power consumption than that of the normal operation mode; and a controller which shifts to the sleep mode once the decider decides that a shift to the sleep mode has been made, wherein, when the heat generation counter value obtained when the decider decides that the shift to the sleep mode has been made is equal to or greater than a specified threshold value, the controller stands by until the counter makes a subtraction from the heat generation counter value to the threshold value and then shifts to the sleep mode, and wherein the heat generation counter value functions as a criterion, which is converted from a measured value obtained by pre-measuring variation in temperature of the motor or the motor driver.