| 摘要 |
PURPOSE: An operating method of a safety system of a seat belt is provided to protect a passenger from being injured in a collision of a vehicle by reducing a moving distance of the passenger and distributing the force properly as well as to recognize the danger of the collision before the accident by checking the relative velocity between the vehicle and a colliding object, a distance therebetween and changes in velocity. CONSTITUTION: Relative velocity or deceleration between a vehicle and an object is operated through a speed sensor. A control unit obtains relative velocity between the current traveling vehicle and an object, a distance therebetween and instantaneous deceleration changes in sudden braking by receiving data for calculating the distance between the vehicle and the object through a distance sensor. The control unit compares the relative velocity with critical relative velocity. If the relative velocity is higher than the critical relative velocity, a relative distance is compared with a critical distance. If the relative distance is within the critical distance, the control unit decides the current dangerous situations. A motor is driven, and a retractor(7) is operated to rewind a webbing. The retractor is locked without being released. If battery power is cut off by an actual collision, the retractor is kept locked but rewinding the webbing is stopped. If the relative velocity is lower than the critical relative velocity, the deceleration is compared with critical deceleration. The motor is driven and the webbing is rewound if the deceleration is higher than the critical deceleration. Finally, the retractor stops rewinding the webbing in a specific time.
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