| 摘要 |
A seat belt for a vehicle is provided to improve convenience of an occupant by winding or releasing the belt for an occupant to wear the seat belt conveniently. A seat belt for a vehicle comprises a seat belt motor(10) pulling a seat belt for a vehicle; an H-bridge circuit unit(20) driving the seat belt motor; a motor sensing circuit unit(30) sensing the first voltage and the second voltage running on both ends of the H-bridge; and a control part(40) controlling the seat belt motor depending on variation between the first voltage and the second voltage. The control part calculates voltage variation between the first voltage and the second voltage based on the voltage of the motor sensing circuit.
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