초록 ▼

An occupant-restraining system has a belt force limiter that limits a restraining force exerted on an occupant via a restraining belt by switching from a relatively higher to a relatively lower level of restraining force depending on predefined parameters. The belt-force limiter is activated only af

An occupant-restraining system has a belt force limiter that limits a restraining force exerted on an occupant via a restraining belt by switching from a relatively higher to a relatively lower level of restraining force depending on predefined parameters. The belt-force limiter is activated only after a predetermined forward displacement of the occupant is reached and only after a predefined air bag inflating time, when an excessive crash intensity and an occupant's weight are recognized as being below a predetermined threshold.

대표청구항 ▼

1. An occupant-restraining system having a belt force limiter which limits a restraining force exerted on an occupant via a restraining belt by switching from a relatively higher to a relatively lower level of restraining force when a belt-force limiter is activated, depending on predefined paramete

1. An occupant-restraining system having a belt force limiter which limits a restraining force exerted on an occupant via a restraining belt by switching from a relatively higher to a relatively lower level of restraining force when a belt-force limiter is activated, depending on predefined parameters, wherein the belt-force limiter is activated only after: a predetermined forward displacement of the occupant is reached; a predefined air bag inflating time has expired; and crash intensity and an occupant's weight are recognized as being below a predetermined threshold. 2. The method according to claim 1, wherein the inflating time of the air bag lies in the range of from 40 ms to 70 ms. 3. The method according to claim 1, wherein the predetermined forward displacement of the occupant lies in the range of from 250 mm to 450 mm. 4. The method according to claim 1, wherein the predetermined forward displacement of the occupant is determined via an extension of the belt band. 5. The method according to claim 1, wherein the predetermined forward displacement of the occupant is determined via a twofold integration of an acceleration signal. 6. The method according to claim 1, wherein the belt-force limiter is activated only when there has been previous triggering of a first air-bag stage of the air bag. 7. The method according to claim 1, wherein the belt has a belt tensioner. 8. The method according to claim 7, wherein the belt-force limiter is activated only when there has been previous triggering of the belt tensioner. 9. The method according to claim 1, wherein the limitation of the belt force takes place in a stepwise manner. 10. The method according to claim 1, wherein the limitation of the belt force takes place continuously. 11. The method according to claim 1, wherein the belt-force limiter is activated separately for each vehicle seat. 12. A method of operating a seat belt occupant restraint system in a vehicle having inflatable air bag restraint system, said method comprising: determining forward displacement of a vehicle occupant from a beginning position at a starting time following commencement of an impact of the vehicle; measuring elapsed time after the starting time; and reducing restraining force exerted by said seat belt restraint system only when, i) a predetermined air bag inflation time has expired; ii) a predetermined forward displacement of a vehicle occupant is exceeded; and iii) said occupant's weight and crash intensity are below respective predetermined thresholds. 13. The method of operating a seat belt occupant restraint system in a vehicle according to claim 12, wherein: said air bag restraint system inflates in two stages; and said starting time is a moment at which a first inflation stage occurs.