| 摘要 |
A safety-belt arrangement for use in a motor vehicle has a safety-belt (5), one end of which is connected to a retractor (8), a sensor (11) generates a signal representative of the amount of safety-belt paid-out from the retractor. A force limiter (10) is associated with the retractor to permit safety-belt to be paid-out with a variable force limiting effect. A control arrangement (12) changes the level of force applied by the force limiter (10) by determining a reference point either by measuring a period of time following sensing of a predetermined parameter relating to a crash, and then determining when a specific length of safety-belt has been paid-out, or by sensing when the first level of resistive force is applied by the force limiter, and optionally then determining when a predetermined length of safety-belt has been paid-out, the control arrangement then measuring a predetermined period of time after the reference point has been reached before effecting the change of level of force applied by the force limiter (10).
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