Patent ID: 6766234
Filing Date: 2004-07-20
Classification: B60R

Abstract:
An occupant restraint system, comprising:a seat belt tension application device that adjusts tension applied to a seat belt to restrain an occupant with the seat belt; a longitudinal acceleration detector that detects a longitudinal acceleration occurring in a vehicle along a longitudinal direction; a lateral acceleration detector that detects a lateral acceleration occurring in the vehicle along a lateral direction; and a control device that controls the tension applied by the seat belt tension application device based upon a longitudinal acceleration detection value detected by the longitudinal acceleration detector and a lateral acceleration detection value detected by the lateral acceleration detector, wherein: a two-dimensional map, with a deceleration (negative acceleration) occurring in the vehicle along the longitudinal direction set on a + side of one of two axes orthogonally intersecting each other in a two-dimensional coordinate system, an acceleration of the vehicle manifesting along the longitudinal direction set on a âˆ’ side of the one axis, an acceleration of the vehicle to a right set on a + side of the other axis in the two-dimensional coordinate system and an acceleration of the vehicle to a left set on a âˆ’ side of the other axis, is provided; an operation decision-making threshold line, which forms one of a semi-elliptic shape and a polygonal shape, intersects the other axis on the + side at A, intersects the other axis on the âˆ’ side at âˆ’A and intersects the one axis on the + side at +B satisfying Bthe control device engages the seat belt tension application device to apply the tension to the seat belt if a point on the map determined in conformance to the longitudinal acceleration detection value and the lateral acceleration detection value obtained as the vehicle decelerates is outside a range enclosed by the operation decision-making threshold line and the other axis.