IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0177142
(2002-06-24)
|
우선권정보 |
JP-0010184 (1999-01-19); JP-0173624 (1999-06-21); JP-0355334 (1999-12-15) |
발명자
/ 주소 |
- Fujii, Hiroaki
- Tanaka, Koji
- Fujita, Hitoshi
- Furukawa, Koichi
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
13 인용 특허 :
23 |
초록
▼
In controlling a seat belt retractor, at least one of signals selected from a state signal showing a movement of an occupant wearing a seat belt and an external signal obtained from detecting means installed in a vehicle during running thereof is received. Then, a rotation of a spool for a webbing i
In controlling a seat belt retractor, at least one of signals selected from a state signal showing a movement of an occupant wearing a seat belt and an external signal obtained from detecting means installed in a vehicle during running thereof is received. Then, a rotation of a spool for a webbing is controlled by switching a rotational torque of a motor to a predetermined reduction ratio corresponding to at least one of the state signal and the external signal, or a driving state of the motor is controlled to a predetermined torque, to thereby wind the webbing on the spool. After fastening the seat belt, the seat belt is automatically wound, and after a predetermined time from completion of winding of the webbing, it is determined whether the winding of the webbing is further needed, and if necessary, the webbing is wound again.
대표청구항
▼
1. A control method of a seat belt retractor comprising:applying a webbing of a seat belt to an occupant and fastening a tongue to a buckle,automatically winding the webbing several times repeatedly with a predetermined interval therebetween for preventing looseness of the webbing on the occupant,de
1. A control method of a seat belt retractor comprising:applying a webbing of a seat belt to an occupant and fastening a tongue to a buckle,automatically winding the webbing several times repeatedly with a predetermined interval therebetween for preventing looseness of the webbing on the occupant,determining whether a further winding of the webbing is needed to prevent the looseness of the webbing after a predetermined time from a last winding of the webbing, and if necessary, winding the webbing again,receiving at least one of signals selected from a state signal showing a movement of the occupant wearing the seat belt and an external signal obtained from detecting means installed in a vehicle during running thereof,controlling a rotation of a spool for the webbing by switching a rotational torque of a motor to a predetermined reduction ratio corresponding to at least one of the state signal and the external signal, or controlling a driving state of the motor to a predetermined torque, to thereby wind the webbing on the spool,winding the webbing when the tongue is disengaged from the buckle, andturning OFF a power source of a control circuit for operating the motor upon detection of a situation that winding of the webbing is accomplished or that the webbing has not been withdrawn for a predetermined period of time. 2. A control method of a seat belt retractor as claimed in claim 1, wherein the state signal includes a signal showing withdrawal of the webbing while the webbing is in a winding state, a rotation of the motor being stopped based on the state signal. 3. A control method of a seat belt retractor as claimed in claim 1, wherein the state signal includes a signal showing that the tongue of the webbing is engaged with the buckle of the webbing, by which the motor is driven with such torque as to wind the webbing to fit the webbing onto the occupant. 4. A control method of a seat belt retractor as claimed in claim 3, wherein the state signal includes a signal showing that fitting of the webbing is accomplished, by which the torque of the motor is reduced or driving of the motor is stopped. 5. A control method of a seat belt retractor as claimed in claim 1, wherein the state signal includes a signal showing that withdrawal of the webbing is canceled, by which the motor is started to restart a winding of the webbing. 6. A control method of a seat belt retractor as claimed in claim 1, wherein in a condition that the tongue of the seat belt is engaged with the buckle of the seat belt, when the webbing is withdrawn and stopped, winding of the webbing is started at a time of interruption of the withdrawal of the webbing, and after fitting the webbing to the occupant, the torque of the motor is reduced or driving of the motor is stopped. 7. A control method of a seat belt retractor as claimed in claim 6, wherein the torque of the motor for fitting the webbing to the occupant is set lower than a torque of the motor for winding of the webbing made just after the tongue is engaged with the buckle. 8. A control method of a seat belt retractor as claimed in claim 1, wherein the state signal includes a signal showing that the tongue of the webbing is disengaged from the buckle of the webbing, and by disengagement of the tongue from the buckle, the motor is activated to wind the webbing into the retractor. 9. A control method of a seat belt retractor as claimed in claim 1, wherein at a same time of or after a predetermined period of time from detection of withdrawal of the webbing, a power source of a control circuit for operating the motor is turned ON. 10. A control method of a seat belt retractor as claimed in claim 1, wherein a speed of the motor is controlled to change a speed of winding of the webbing by the motor.
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