Passenger restraining protective system
First Claim
1. A passenger restraining protective system having a seat belt retracting apparatus for retracting a seat belt in order to restrain a passenger of a vehicle, comprising:
- a first pretensioner having a motor adapted to operate when the possibility of a collision is determined to exist, to thereby retract the seat belt until the tension of the seat belt reaches a first belt tension that is higher than the belt tension that exists during normal driving conditions, the motor including a deceleration mechanism for converting rapid rotation of the motor into torque for producing the first belt tension;
a second pretensioner adapted to operate when a collision is determined to have occurred, to thereby retract the seat belt until the tension of the seat belt reaches a second belt tension that is higher than said first belt tension;
a controller which, when a collision is determined to have occurred, is adapted to cause said second pretensioner to operate, irrespective of the operation of said first pretensioner.
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Accused Products
Abstract
The present invention has an object to permit operation of the second pretensioner operating upon determination of a collision, irrespective of operation of the first pretensioner operating upon determination of the possibility of collision. When a vehicle body deceleration is determined not to exceed a set deceleration, possibility of collision with an obstacle is determined on the basis of a relative distance from the obstacle, a relative speed, and a vehicle speed of the subject vehicle. When the possibility of a collision is determined, a motor associated with a retractor is rotated and the webbing is retracted with a large torque until the webbing has the second set belt tension. When the vehicle deceleration is determined to be over a set deceleration, a buckle pretensioner is operated. The buckle is very strongly pulled, and the webbing is set at a third belt tension. The passenger is thus restrained by a large restraining force. At this point, the buckle pretensioner is preferentially operated irrespective of operation of the motor.
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Citations
11 Claims
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1. A passenger restraining protective system having a seat belt retracting apparatus for retracting a seat belt in order to restrain a passenger of a vehicle, comprising:
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a first pretensioner having a motor adapted to operate when the possibility of a collision is determined to exist, to thereby retract the seat belt until the tension of the seat belt reaches a first belt tension that is higher than the belt tension that exists during normal driving conditions, the motor including a deceleration mechanism for converting rapid rotation of the motor into torque for producing the first belt tension;
a second pretensioner adapted to operate when a collision is determined to have occurred, to thereby retract the seat belt until the tension of the seat belt reaches a second belt tension that is higher than said first belt tension;
a controller which, when a collision is determined to have occurred, is adapted to cause said second pretensioner to operate, irrespective of the operation of said first pretensioner. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification