Seat belt retractor,seat belt apparatus, seat belt winding method,computer program, and seat belt system
First Claim
1. A seat belt retractor comprising:
- a body size index detection unit for detecting an index indicating the body size of an occupant;
a reference value setting unit for setting a first reference value of a predetermined parameter, which varies according to the winding of a seat belt, based on the index detected by said body size index detection unit;
a winding mechanism for winding said seat belt; and
a winding speed adjusting unit which sets the winding speed of said winding mechanism to a first speed between the time when said winding mechanism starts winding of said seat belt and the time when said predetermined parameter reaches said first reference value, and sets the winding speed of said winding mechanism to a second speed slower than said first speed after said predetermined parameter reaches said first reference value.
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Accused Products
Abstract
A seat belt retractor (1) is provided which comprises a rotation sensor (8) for detecting the withdrawn amount of a seat belt, a control amount setting unit for setting a first control amount for winding up the seat belt (3) and a second control amount to which the amount reaches after the first control amount according to the winding of the seat belt (3), an electric motor (6) having a two-stage winding speed composed of at least a high speed and a low speed as the speed winding the seat belt (3), and a winding speed adjusting unit for setting the winding speed of the electric motor (6) to the high speed between the time when the electric motor (6) starts the winding of the seat belt (3) and the time when the amount reaches the first control amount, setting the winding speed of the electric motor to the low speed when the amount exceeds the first control amount, and stopping the winding action of the seat belt (3) after the amount exceeds the second control amount, thereby quickly accommodating the seat belt (3) regardless of the body size of the occupant and preventing a seat belt fixture (sic) (17) from strongly hitting a pillar or the like.
20 Citations
15 Claims
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1. A seat belt retractor comprising:
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a body size index detection unit for detecting an index indicating the body size of an occupant; a reference value setting unit for setting a first reference value of a predetermined parameter, which varies according to the winding of a seat belt, based on the index detected by said body size index detection unit; a winding mechanism for winding said seat belt; and a winding speed adjusting unit which sets the winding speed of said winding mechanism to a first speed between the time when said winding mechanism starts winding of said seat belt and the time when said predetermined parameter reaches said first reference value, and sets the winding speed of said winding mechanism to a second speed slower than said first speed after said predetermined parameter reaches said first reference value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A seat belt apparatus, comprising:
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a fixing member for fixing an end of a seat belt; a seat belt retractor which is connected to the other end of said seat belt to wind up said seat belt; an engaging member through which said seat belt is inserted and is slidably supported; a buckle which is disposed on a side opposite to said fixing member relative to a seat and is engaged with said engaging member; and a guide member which is located above said fixing member, through which said seat belt is inserted, and which supports slidably said seat belt, wherein said seat belt retractor comprises; a body size index detection unit for detecting an index indicating the body size of an occupant; a reference value setting unit for setting a first reference value of a predetermined parameter, which varies according to the winding of said seat belt, based on the index detected by said body size index detection unit; a winding mechanism for winding said seat belt; and a winding speed adjusting unit which sets the winding speed of said winding mechanism to a first speed between the time when said winding mechanism starts winding of said seat belt and the time when said predetermined parameter reaches said first reference value, and sets the winding speed of said winding mechanism to a second speed slower than said first speed after said predetermined parameter reaches said first reference value.
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12. A seat belt winding method comprising:
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detecting the withdrawn amount of a seat belt when an occupant wears the seat belt; setting a predetermined reference value based on the detected withdrawn amount; and winding said seat belt at a first speed until said withdrawn amount reaches a reference value, and winding said seat belt at a second speed lower than said first speed after said withdrawn amount reaches the reference value according to the winding of said seat belt. - View Dependent Claims (13)
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14. A computer program for making a computer, for controlling a winding mechanism for winding a seat belt, carry out:
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a step of taking in an index indicating the body size of an occupant to set a reference value of a predetermined parameter which varies according to the winding of said seat belt based on the index, a step of controlling said winding mechanism to wind up said seat belt at a first speed until said predetermined parameter varying according to the winding of said seat belt reaches said reference value obtained based on the detected index, and a step of controlling said winding mechanism to wind up said seat belt at a second speed lower than said first speed after said predetermined parameter reaches said reference value.
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15. A seat belt system, comprising:
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a fixing member for fixing an end of a seat belt; a seat belt winding mechanism which is connected to the other end of said seat belt to wind up said seat belt; a driving device for driving said seat belt winding mechanism to wind up said seat belt; an engaging member through which said seat belt is inserted and is slidably supported; a buckle which is disposed on a side opposite to said fixing member relative to a seat and is engaged with said engaging member; a guide member which is located above said fixing member, through which said seat belt is inserted, and which supports slidably said seat belt, and a computer for inputting an index indicating the body size of an occupant, sets a reference value of a predetermined parameter, which varies according to the winding of said seat belt, based on the index, controlling said driving device to wind up said seat belt at a first speed until said predetermined parameter which varies according to the winding of said seat belt reaches said reference value which was set based on the detected index, and controlling said driving device to wind up said seat belt at a second speed lower than said first speed after said predetermined parameter reaches said reference value.
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Specification