WO2009115185A1 - Seat belt system having a reversible belt tensioner and control method for a reversible belt tensioner - Google Patents
Seat belt system having a reversible belt tensioner and control method for a reversible belt tensioner Download PDFInfo
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- WO2009115185A1 WO2009115185A1 PCT/EP2009/001508 EP2009001508W WO2009115185A1 WO 2009115185 A1 WO2009115185 A1 WO 2009115185A1 EP 2009001508 W EP2009001508 W EP 2009001508W WO 2009115185 A1 WO2009115185 A1 WO 2009115185A1
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- Prior art keywords
- belt tensioner
- vehicle
- vehicle deceleration
- reversible
- safety
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
- B60R21/013—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
- B60R21/0132—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over responsive to vehicle motion parameters, e.g. to vehicle longitudinal or transversal deceleration or speed value
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
- B60R2021/01204—Actuation parameters of safety arrangents
- B60R2021/01252—Devices other than bags
- B60R2021/01265—Seat belts
- B60R2021/01272—Belt tensioners
Definitions
- the invention relates to a safety belt system having the features of the preamble of claim 1 and a control method having the features of the preamble of claim 10.
- Control methods for reversible belt tensioners are well known in the art.
- the task of the reversible belt tensioner is, in a situation in which an accident could possibly follow, also referred to as a pre-crash phase to extract existing belt slack from the seat belt system to the occupants as early as possible in the event of a subsequent accident Coupling vehicle deceleration. Due to the early coupling of the occupant to the vehicle deceleration becomes the occupant load
- reversible belt tensioners also serve as a warning system in order to alert the occupants of a dangerous situation, and in general to the mediation of an active safety device.
- Reversible belt tensioners can, for example, have an electric motor drive, which is particularly easy to control. Furthermore, reversible belt tensioners with a mechanically tensioned spring or else known with a compressed air storage.
- a safety belt system in which a Vorstrammer is provided, which is controlled in dependence on the speed and the distance of the vehicle with respect to an object.
- a restraint system in which a sensor device is provided, by means of which vehicle dynamic conditions are detected, which are evaluated in an evaluation unit for determining a potential accident situation.
- the electrically driven reversibly operating tightening drive is then activated above a vehicle speed when a potential accident situation is detected.
- a disadvantage of these systems is that they use only a limited number of parameters for controlling the reversible belt tensioner, so that certain critical situations are not taken into account or use signals that are generated only when the driving safety critical situation is traveled.
- the object of the invention is to provide a reversible belt tensioner and a control method for the belt tensioner, in which the occupant is to be coupled as early as possible to the vehicle deceleration and in which all critical parameters are used to determine a possible accident to control the belt tensioner, where the effort of the control should nevertheless be kept as low as possible.
- the object of the invention is achieved by a reversible belt tensioner with the features of claim 1 and by a Control method with the features of claim 10 solved.
- the motor vehicle has a driving speed control device for regulating the driving speed as a function of driving safety-relevant parameters and the reversible belt tensioner can be controlled by the driving speed control device.
- the advantage of the invention lies in the fact that the vehicle speed control device used to control the belt tensioner already takes into account all driving safety relevant parameters, since the vehicle speed control device itself is already subject to very high requirements on the part of the vehicle manufacturer. Furthermore, the vehicle speed control device supplies a signal which directly indicates the future vehicle deceleration and is thus directly coupled to the expected occupant deceleration. Furthermore, the occupant is not surprised by the sudden reduction in driving speed and associated advance displacement, since at the same time as the vehicle deceleration due to the vehicle deceleration, the belt force is increased by the reversible belt tensioner and a forward displacement of the occupant is prevented.
- a further preferred embodiment of the invention consists in that a vehicle deceleration to be made can be determined from the driving safety-relevant parameters in the vehicle speed control device, and the reversible belt tensioner can be activated when a predefined vehicle deceleration is exceeded. This prevents the reversible belt tensioner from being activated with every slight reduction in the driving speed and prevents the occupant from being constantly “twitched” by the safety belt system. but only in those cases where the occupant would experience a significant forward shift due to vehicle deceleration.
- the reversible belt tensioner at a predetermined vehicle deceleration of at least 0.45g can be controlled.
- a plurality of vehicle decelerations are predetermined, beyond which the belt tensioner can be controlled differently.
- the belt tensioner can thereby be controlled in stages, so that the belt force exerted by the belt tensioner on the occupant belt force is increased continuously or discontinuously, and thus the occupant a further improved sense of security is conveyed.
- the tensioning force of the reversible belt tensioner can vary both for different vehicle decelerations and for different vehicle accelerations.
- a further preferred embodiment of the invention consists in that the reversible belt tensioner can be controlled to exceed a first vehicle deceleration of 0.3 g for exerting a first pretension and can be controlled to exert a second pretension when a second vehicle deceleration of 0.45 g is exceeded. wherein the second bias voltage is greater than the first bias voltage.
- the limits of the predetermined vehicle decelerations of 0.3 g and 0.45 g have proven to be advantageous in that these values for the occupant are already significant occupant delays and have proven to be a good compromise between an unnecessary permanent tightening of the seat belt and a good retention characteristic .
- the safety belt system comprises a second irreversible belt tensioner controlled by the vehicle speed control device.
- Irreversible belt tensioners for example, are driven by pyrotechnics and have a considerably greater tautening force and serve to improve performance when determining an unavoidable accident.
- the proposed solution is particularly advantageous if both the reversible belt tensioner and the irreversible belt tensioner are arranged on a common belt retractor.
- both the reversible and the irreversible belt tensioners can be connected via a common signal line with the vehicle speed control device.
- a vehicle deceleration to be made can be determined from the driving safety-related parameters in the vehicle speed control device, and the second irreversible belt tensioner can be activated when a predetermined vehicle deceleration is exceeded. This ensures that the irreversible belt tensioner is actuated only when a predetermined vehicle deceleration is exceeded, the predetermined vehicle deceleration advantageously being selected such that an unavoidable accident can be deduced.
- the reversible belt tensioner can be controlled when a first or second predetermined vehicle deceleration is exceeded, and the irreversible belt tensioner can be activated when a third predetermined vehicle deceleration is exceeded, the first and second predetermined vehicle deceleration being smaller than the third predetermined vehicle deceleration are.
- a control method for a reversible belt tensioner for a motor vehicle is proposed in which driving safety-relevant parameters are detected in a device, in a vehicle speed control device the ascertained driving safety relevant parameters are compared with predetermined limits of the driving safety relevant parameters .
- one or more predetermined limit values of the vehicle delays are stored in a memory unit, and the limit values of the vehicle delays and the calculated advancing vehicle delays are compared in a comparison device,
- the reversible belt tensioner is calculated by the calculated vehicle decelerations to be carried out.
- the proposed control method has the advantage that the reversible belt tensioner is controlled directly as a function of the vehicle deceleration to be made. As a result, the belt force is always increased when the occupant would be subject to increased forward displacement due to the vehicle deceleration to be made. This occupant forward displacement is then minimized by the increased restraining force by the controlled reversible belt tensioner or else prevented.
- the vehicle deceleration made by the vehicle speed control device can take place in any desired manner, such as, for example, brake intervention, injection suppression, throttle control, switching from engine to generator operation of an electric drive, etc. Important in the invention is merely that the reversible belt tensioner is driven coupled to the vehicle to be made delay.
- the storage units and comparison devices may be assigned individually or jointly to the vehicle speed control device, the reversible belt tensioner, or may also be designed as separate units.
- the driving safety-relevant parameters are formed from one or more of the following variables,
- the distance and the speed to the next object located in the direction of travel represent very important parameters, by which, for example, the situation of a second vehicle shattering in front of the vehicle, an approach to a jam end or also a stationary bridge pier in front of the vehicle in the direction of travel be taken into account for controlling the driving speed. Furthermore, it is to consider the slip between the wheels and the roadway, which can take into account the sudden slipping of the wheels on slippery roads. The driving speed is then automatically reduced until the slip falls below an accepted target value and the driving-critical situation is completed.
- a further preferred embodiment of the control method is that several predetermined limit values of the vehicle decelerations are stored in the memory unit and the reversible belt tensioner is controlled differently when the limit values are exceeded.
- the predetermined limits may be e.g. be stepped such that for larger anticipated vehicle decelerations of the belt tensioner generates a higher tension force or is exceeded when exceeding a vehicle deceleration, which suggests an unavoidable accident, not driven, if an irreversible belt tensioner is provided, which is controlled by the reversible The belt tensioner should not be disturbed in its function.
- Fig.l Motor vehicle with Fahr Anthonysregeleinrich- direction and seat belt system with reversible belt tensioner
- FIG.2 Safety belt system with reversible belt tensioner
- FIG. 3 Travel speed control device with memory unit and evaluation unit for controlling the reversible belt tensioner
- the safety belt 8 is, as can also be seen in FIG. 2, designed as a three-point belt and fastened with its ends to the motor vehicle 1 via an end fitting 14 and a belt retractor provided with a reversible belt tensioner 6 and an irreversible belt tensioner 17. Furthermore, the safety belt 8 is fastened in a belt lock 9 by means of a belt tongue.
- the reversible belt tensioner 6 and the irreversible belt tensioner 17 are assigned here to the belt reel-up, but can also be used with the same effect
- FIG. 1 also shows a device 4 for determining driving safety-relevant parameters K, which transmits the determined data to a vehicle speed control device 5.
- Driving speed control devices are known, for example, under the terms ACC (Adaptive Cruise Control) or active cruise control.
- ACC Adaptive Cruise Control
- the driver can set a desired speed which the vehicle automatically adopts.
- the driving speed is readjusted to the desired speed, even in the case of sudden inclines or inclines, by automatically accelerating or decelerating.
- the driving speed control device 5 is Control of the reversible belt tensioner 6 connected to this via a signal line.
- the facility 4 determines the driving safety-relevant parameters K. These may be, for example, the distance S or the speed difference ⁇ V to the next object in the direction of travel or the current slip T or an external signal E of a traffic control system for controlling the driving speed or even the determination of an error F by a fault diagnosis system, such as failure of a Brake, sudden oil loss, etc.
- the determined parameters K are then fed to a first comparison device 15, in which these are compared with predetermined limits KG read out from a first memory unit 16.
- the rever- sible belt tensioner 6 is actuated and the restraining force of the occupant is correspondingly increased by the safety belt 8.
- the tightening of the seat belt 8 takes place even before the actual vehicle deceleration ar, so that the seat belt 8 is barely tightened when the occupant still performs no forward displacement due to the made vehicle deceleration a r .
- the belt force is already increased at the beginning of the occupant delay and coupled to the occupant at the earliest possible time to the vehicle deceleration.
- Various predetermined limit values of the vehicle decelerations aci, aG2, aG3, etc., to be undertaken may be provided, to which different belt forces of the reversible belt tensioner 6 to be generated are assigned.
- FIG. 4 shows a driving situation with the motor vehicles A and B by way of example.
- the motor vehicle A an activation of the belt tensioner according to the invention is provided.
- Vehicle B overtakes vehicle A, so that the predetermined minimum distance SG has fallen below.
- the reversible belt tensioner is activated and the driving speed is reduced.
- the occupant senses in this process both the speed reduction and the early increase of the restraint force as coupled operations that complement each other meaningfully and thus has a positive sense of active safety.
- the vehicle deceleration to be made can also be achieved by the transmission of an external signal E from an external traffic management system 12 or a signal generator 13 for the one-time reduction of the driving speed are generated.
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Abstract
Description
Sicherheitsgurtsystem mit einem reversiblen Gurtstraffer und Steuerungsverfahren für einen reversiblen Gurtstraffer Seat belt system with a reversible belt tensioner and control system for a reversible belt tensioner
5 Die Erfindung betrifft ein Sicherheitsgurtsystem mit den Merkmalen des Oberbegriffes des Anspruchs 1 sowie ein Steuerungsverfahren mit den Merkmalen des Oberbegriffes des Anspruchs 10.The invention relates to a safety belt system having the features of the preamble of claim 1 and a control method having the features of the preamble of claim 10.
lo Sicherheitsgurtsysteme mit reversiblen Gurtstraffern sowielo safety belt systems with reversible belt tensioners as well
Steuerungsverfahren für reversible Gurtstraffer sind im Stand der Technik hinreichend bekannt . Aufgabe des reversiblen Gurtstraffers ist es, in einer Situation, in der möglicherweise ein Unfall folgen könnte, auch als Pre-Crash Phase bezeich- i5 net, vorhandene Gurtlose aus dem Sicherheitsgurtsystem herauszuziehen, um den Insassen dann in der möglichen nachfolgenden Unfallsituation möglichst frühzeitig an die Fahrzeugverzögerung anzukoppeln. Aufgrund der frühzeitigen Ankopplung des Insassen an die Fahrzeugverzögerung wird die InsassenbelastungControl methods for reversible belt tensioners are well known in the art. The task of the reversible belt tensioner is, in a situation in which an accident could possibly follow, also referred to as a pre-crash phase to extract existing belt slack from the seat belt system to the occupants as early as possible in the event of a subsequent accident Coupling vehicle deceleration. Due to the early coupling of the occupant to the vehicle deceleration becomes the occupant load
2o auf einen möglichst langen Weg der Vorwärtsverlagerung verteilt und damit der Maximalwert der Insassenbelastung reduziert. Ferner dienen reversible Gurtstraffer auch als Warnsystem, um den Insassen auf eine Gefahrensituation aufmerksam zu machen, und allgemein der Vermittlung eines aktiven Sicher-2o distributed as long as possible way of forward displacement and thus reduces the maximum value of the occupant load. Furthermore, reversible belt tensioners also serve as a warning system in order to alert the occupants of a dangerous situation, and in general to the mediation of an active safety device.
25 heitsgefühls für den Insassen.25 feeling for the occupant.
Für den Fall, dass der Pre-Crash Phase kein Unfall folgt, wird der Gurtstraffer wieder deaktiviert und die Gurtkraft wieder gesenkt. Aus diesem Grunde ist es wichtig, dass der Gurtstraf- 30 fer reversibel arbeitet. Reversible Gurtstraffer können zum Beispiel einen elektromotorischen Antrieb aufweisen, welcher besonders einfach anzusteuern ist. Ferner sind reversible Gurtstraffer mit einer mechanisch gespannten Feder oder auch mit einem Druckluftspeicher bekannt.In the event that the pre-crash phase does not follow an accident, the belt tensioner is deactivated again and the belt force is lowered again. For this reason, it is important that the seat belt pretensioner works reversibly. Reversible belt tensioners can, for example, have an electric motor drive, which is particularly easy to control. Furthermore, reversible belt tensioners with a mechanically tensioned spring or else known with a compressed air storage.
Aus der DE 44 11 184 C2 ist ein Sicherheitsgurtsystem bekannt, bei dem ein Vorstrammer vorgesehen ist, der in Abhängigkeit von der Geschwindigkeit und der Entfernung des Fahrzeuges in Bezug auf ein Objekt angesteuert wird.From DE 44 11 184 C2, a safety belt system is known, in which a Vorstrammer is provided, which is controlled in dependence on the speed and the distance of the vehicle with respect to an object.
Aus der DE 100 29 061 Al ist ferner ein Rückhaltesystem bekannt, bei dem eine Sensoreinrichtung vorgesehen ist, mittels derer fahrdynamische Zustände erfasst werden, welche in einer Auswerteeinheit zur Ermittlung einer potentiellen Unfallsituation ausgewertet werden. Der elektrisch angetriebene reversibel arbeitende Strafferantrieb wird dann oberhalb einer Fahrzeuggeschwindigkeit bei Erkennen einer potentiellen Unfallsi- tuation angesteuert.From DE 100 29 061 Al a restraint system is also known, in which a sensor device is provided, by means of which vehicle dynamic conditions are detected, which are evaluated in an evaluation unit for determining a potential accident situation. The electrically driven reversibly operating tightening drive is then activated above a vehicle speed when a potential accident situation is detected.
Nachteilig bei diesen Systemen ist jedoch, dass diese nur eine begrenzte Anzahl von Kenngrößen zur Steuerung des reversiblen Gurtstraffers nutzen, so dass bestimmte kritische Situationen nicht berücksichtigt werden oder Signale nutzen, welche erst erzeugt werden, wenn die fahrsicherheitskritische Situation bereist eingetreten ist .A disadvantage of these systems, however, is that they use only a limited number of parameters for controlling the reversible belt tensioner, so that certain critical situations are not taken into account or use signals that are generated only when the driving safety critical situation is traveled.
Aufgabe der Erfindung ist es, einen reversiblen Gurtstraffer und ein Steuerungsverfahren für den Gurtstraffer zu schaffen, bei dem der Insasse möglichst früh an die Fahrzeugverzögerung angekoppelt werden soll und bei dem möglichst alle kritischen Kenngrößen zur Ermittlung eines möglichen Unfalles zur Ansteuerung des Gurtstraffers genutzt werden, wobei der Aufwand der Steuerung trotzdem möglichst gering gehalten werden soll.The object of the invention is to provide a reversible belt tensioner and a control method for the belt tensioner, in which the occupant is to be coupled as early as possible to the vehicle deceleration and in which all critical parameters are used to determine a possible accident to control the belt tensioner, where the effort of the control should nevertheless be kept as low as possible.
Die Aufgabe der Erfindung wird durch einen reversiblen Gurt- straffer mit den Merkmalen des Anspruchs 1 sowie durch ein Steuerungsverfahren mit den Merkmalen des Anspruchs 10 gelöst .The object of the invention is achieved by a reversible belt tensioner with the features of claim 1 and by a Control method with the features of claim 10 solved.
Zur Lösung der Aufgabe wird vorgeschlagen, dass das Kraftfahrzeug eine Fahrgeschwindigkeitsregeleinrichtung zur Regelung der Fahrgeschwindigkeit in Abhängigkeit von fahrsicherheitsre- levanten Kenngrößen aufweist und der reversible Gurtstraffer von der Fahrgeschwindigkeitsregeleinrichtung ansteuerbar ist.To achieve the object, it is proposed that the motor vehicle has a driving speed control device for regulating the driving speed as a function of driving safety-relevant parameters and the reversible belt tensioner can be controlled by the driving speed control device.
Der Vorteil der Erfindung ist darin zu sehen, dass die zur An- Steuerung des Gurtstraffers genutzte Fahrgeschwindigkeitsregeleinrichtung bereits sämtliche fahrsicherheitsrelevanten Kenngrößen berücksichtigt, da die Fahrgeschwindigkeitsregeleinrichtung selbst bereits sehr hohen Anforderungen seitens des Fahrzeugherstellers unterliegt. Ferner liefert die Fahrgeschwindigkeitsregeleinrichtung ein Signal, welches direkt auf die zukünftige Fahrzeugverzögerung schließen lässt und damit direkt an die zu erwartende Insassenverzögerung gekoppelt ist . Ferner wird der Insasse nicht durch die plötzliche Fahrgeschwindigkeitsreduzierung und damit einhergehender Vorverlage- rung überrascht, da gleichzeitig mit der eintretenden Insassenverzögerung bedingt durch die Fahrzeugverzögerung die Gurt- kraft durch den reversiblen Gurtstraffer erhöht wird und eine Vorverlagerung des Insassen verhindert wird.The advantage of the invention lies in the fact that the vehicle speed control device used to control the belt tensioner already takes into account all driving safety relevant parameters, since the vehicle speed control device itself is already subject to very high requirements on the part of the vehicle manufacturer. Furthermore, the vehicle speed control device supplies a signal which directly indicates the future vehicle deceleration and is thus directly coupled to the expected occupant deceleration. Furthermore, the occupant is not surprised by the sudden reduction in driving speed and associated advance displacement, since at the same time as the vehicle deceleration due to the vehicle deceleration, the belt force is increased by the reversible belt tensioner and a forward displacement of the occupant is prevented.
Eine weitere bevorzugte Ausgestaltung der Erfindung besteht darin, dass aus den fahrsicherheitsrelevanten Kenngrößen in der Fahrgeschwindigkeitsregeleinrichtung eine vorzunehmende Fahrzeugverzögerung ermittelbar ist, und der reversible Gurt- straffer bei Überschreiten einer vorgegebenen Fahrzeugverzöge- rung ansteuerbar ist. Damit wird verhindert, dass der reversible Gurtstraffer bei jeder geringfügigen Verminderung der Fahrgeschwindigkeit angesteuert wird und der Insasse nicht durch ein ständiges „Zucken" des Sicherheitsgurtsystems ge- stört wird, sondern nur in solchen Fällen, in denen der Insasse aufgrund der Fahrzeugverzögerung eine signifikante Vorwärtsverlagerung erfahren würde.A further preferred embodiment of the invention consists in that a vehicle deceleration to be made can be determined from the driving safety-relevant parameters in the vehicle speed control device, and the reversible belt tensioner can be activated when a predefined vehicle deceleration is exceeded. This prevents the reversible belt tensioner from being activated with every slight reduction in the driving speed and prevents the occupant from being constantly "twitched" by the safety belt system. but only in those cases where the occupant would experience a significant forward shift due to vehicle deceleration.
Es wird weiter vorgeschlagen, dass der reversible Gurtstraffer bei einer vorgegebenen Fahrzeugverzögerung von wenigstens 0,45g ansteuerbar ist.It is further proposed that the reversible belt tensioner at a predetermined vehicle deceleration of at least 0.45g can be controlled.
Weiterhin wird vorgeschlagen, dass mehrere Fahrzeugverzögerun- gen vorgegeben sind, bei deren Überschreiten der Gurtstraffer unterschiedlich ansteuerbar ist. Der Gurtstraffer kann dadurch in Stufen angesteuert werden, so dass die von dem Gurtstraffer auf den Insassen ausgeübte Gurtkraft kontinuierlich oder diskontinuierlich gesteigert wird und somit dem Insassen ein wei- ter verbessertes Gefühl der Sicherheit vermittelt wird. Die Straffkraft des reversiblen Gurtstraffers kann dabei sowohl für verschiedene Fahrzeugverzδgerungen als auch für verschiedene Fahrzeugbeschleunigungen variieren.Furthermore, it is proposed that a plurality of vehicle decelerations are predetermined, beyond which the belt tensioner can be controlled differently. The belt tensioner can thereby be controlled in stages, so that the belt force exerted by the belt tensioner on the occupant belt force is increased continuously or discontinuously, and thus the occupant a further improved sense of security is conveyed. The tensioning force of the reversible belt tensioner can vary both for different vehicle decelerations and for different vehicle accelerations.
Eine weiter bevorzugte Ausbildung der Erfindung besteht darin, dass der reversible Gurtstraffer bei Überschreiten einer ersten vorzunehmenden Fahrzeugverzögerung von 0 , 3g zur Ausübung einer ersten Vorspannung ansteuerbar ist, und bei Überschreiten einer zweiten vorzunehmenden Fahrzeugverzögerung von 0,45g zur Ausübung einer zweiten Vorspannung ansteuerbar ist, wobei die zweite Vorspannung größer als die erste Vorspannung ist. Die Grenzwerte der vorgegebenen Fahrzeugverzögerungen von 0,3g und 0,45g haben sich insofern als vorteilhaft erwiesen, da diese Werte für den Insassen bereits erhebliche Insassenverzö- gerungen darstellen und sich als guter Kompromiss zwischen einem unnötigen ständigen Anstraffen des Sicherheitsgurtes und einer guten Rückhaltecharakteristik erwiesen haben. Es wird weiter vorgeschlagen, dass das Sicherheitsgurtsystem einen zweiten irreversiblen von der Fahrgeschwindigkeitsregeleinrichtung angesteuerten Gurtstraffer aufweist. Irreversible Gurtstraffer werden zum Beispiel pyrotechnisch angetrie- ben und weisen eine erheblich größere Straffkraft auf und dienen der Leistungsstraffung bei Ermittlung eines unvermeidbaren Unfalles. Die vorgeschlagene Lösung ist insbesondere dann vorteilhaft, wenn sowohl der reversible Gurtstraffer als auch der irreversible Gurtstraffer an einem gemeinsamen Gurtaufroller angeordnet sind. In diesem Fall können sowohl der reversible als auch der irreversible Gurtstraffer über eine gemeinsame Signalleitung mit der Fahrgeschwindigkeitsregeleinrichtung verbunden werden .A further preferred embodiment of the invention consists in that the reversible belt tensioner can be controlled to exceed a first vehicle deceleration of 0.3 g for exerting a first pretension and can be controlled to exert a second pretension when a second vehicle deceleration of 0.45 g is exceeded. wherein the second bias voltage is greater than the first bias voltage. The limits of the predetermined vehicle decelerations of 0.3 g and 0.45 g have proven to be advantageous in that these values for the occupant are already significant occupant delays and have proven to be a good compromise between an unnecessary permanent tightening of the seat belt and a good retention characteristic , It is further proposed that the safety belt system comprises a second irreversible belt tensioner controlled by the vehicle speed control device. Irreversible belt tensioners, for example, are driven by pyrotechnics and have a considerably greater tautening force and serve to improve performance when determining an unavoidable accident. The proposed solution is particularly advantageous if both the reversible belt tensioner and the irreversible belt tensioner are arranged on a common belt retractor. In this case, both the reversible and the irreversible belt tensioners can be connected via a common signal line with the vehicle speed control device.
In vorteilhafter Weise kann aus den fahrsicherheitsrelevanten Kenngrößen in der Fahrgeschwindigkeitsregeleinrichtung eine vorzunehmende Fahrzeugverzögerung ermittelbar sein, und der zweite irreversible Gurtstraffer bei Überschreiten einer vorgegebenen Fahrzeugverzögerung ansteuerbar sein. Damit wird si- chergestellt, dass der irreversible Gurtstraffer erst bei Ü- berschreiten einer vorgegebenen Fahrzeugverzögerung angesteuert wird, wobei die vorgegebene Fahrzeugverzögerung zweckmäßiger Weise derart gewählt ist, dass auf einen unvermeidbaren Unfall geschlossen werden kann.Advantageously, a vehicle deceleration to be made can be determined from the driving safety-related parameters in the vehicle speed control device, and the second irreversible belt tensioner can be activated when a predetermined vehicle deceleration is exceeded. This ensures that the irreversible belt tensioner is actuated only when a predetermined vehicle deceleration is exceeded, the predetermined vehicle deceleration advantageously being selected such that an unavoidable accident can be deduced.
Es wird weiter vorgeschlagen, dass der reversible Gurtstraffer bei Überschreiten einer ersten oder zweiten vorgegebenen Fahrzeugverzögerung ansteuerbar ist, und der irreversible Gurt- straffer bei Überschreiten einer dritten vorgegebenen Fahr- zeugverzögerung ansteuerbar ist, wobei die erste und zweite vorgegebene Fahrzeugverzögerung kleiner als die dritte vorgegebene Fahrzeugverzögerung sind. Damit ist in der Ansteuerung der beiden Gurtstraffer eine klare Hierarchie vorgegeben, die die Ansteuerung beider Gurtstraffer mit ein und demselben Signal ermöglicht.It is further proposed that the reversible belt tensioner can be controlled when a first or second predetermined vehicle deceleration is exceeded, and the irreversible belt tensioner can be activated when a third predetermined vehicle deceleration is exceeded, the first and second predetermined vehicle deceleration being smaller than the third predetermined vehicle deceleration are. Thus, a clear hierarchy is given in the control of the two belt tensioners, the the control of both belt tensioners with one and the same signal allows.
Ferner wird zur Lösung der der Erfindung zugrunde liegenden Aufgabe ein Steuerungsverfahren für einen reversiblen Gurtstraffer für ein Kraftfahrzeug vorgeschlagen, bei dem -in einer Einrichtung fahrsicherheitsrelevante Kenngrößen er- fasst werden, -in einer Fahrgeschwindigkeitsregeleinrichtung die ermittelten fahrsicherheitsrelevanten Kenngrößen mit vorgegebenen Grenzwerten der fahrsicherheitsrelevanten Kenngrößen verglichen werden,Furthermore, to solve the problem underlying the invention, a control method for a reversible belt tensioner for a motor vehicle is proposed in which driving safety-relevant parameters are detected in a device, in a vehicle speed control device the ascertained driving safety relevant parameters are compared with predetermined limits of the driving safety relevant parameters .
-und bei Überschreiten der Grenzwerte durch die ermittelten fahrsicherheitsrelevanten Kenngrößen eine fahrsicherheitskri- tische Fahrsituation erkannt wird, und eine vorzunehmende Fahrzeugverzögerung ermittelt wird,-and when the limit values are exceeded, a driving safety-critical driving situation is detected by the ascertained driving safety-relevant parameters, and a vehicle deceleration to be carried out is determined,
-in einer Speichereinheit ein oder mehrere vorgegebene Grenzwerte der Fahrzeugverzögerungen gespeichert sind, und die Grenzwerte der Fahrzeugverzögerungen und die errechneten vor- zunehmenden Fahrzeugverzögerungen in einer Vergleichseinrichtung verglichen werden,one or more predetermined limit values of the vehicle delays are stored in a memory unit, and the limit values of the vehicle delays and the calculated advancing vehicle delays are compared in a comparison device,
-und bei Überschreiten der Grenzwerte der Fahrzeugverzögerungen durch die errechneten vorzunehmenden Fahrzeugverzögerungen der reversible Gurtstraffer angesteuert wird.and when the limit values of the vehicle decelerations are exceeded, the reversible belt tensioner is calculated by the calculated vehicle decelerations to be carried out.
Das vorgeschlagene Steuerungsverfahren bietet den Vorteil, dass der reversible Gurtstraffer direkt in Abhängigkeit von der vorzunehmenden Fahrzeugverzögerung angesteuert wird. Dadurch wird die Gurtkraft immer dann erhöht, wenn der Insasse aufgrund der vorzunehmenden Fahrzeugverzögerung einer erhöhten Vorwärtsverlagerung unterliegen würde. Diese Insassenvorwärts- verlagerung wird dann durch die erhöhte Rückhaltekraft durch den angesteuerten reversiblen Gurtstraffer minimiert oder auch verhindert. Die von der Fahrgeschwindigkeitsregeleinrichtung vorgenommene Fahrzeugverzögerung kann auf beliebige Art und Weise, wie z.B. Bremseneingriff, Einspritzausblendung, Drosselklappensteuerung, Umschaltung von Motor- auf Generatorbe- trieb eines Elektroantriebes, etc. erfolgen. Wichtig bei der Erfindung ist lediglich, dass der reversible Gurtstraffer gekoppelt an die vorzunehmende Fahrzeugverzögerung angesteuert wird.The proposed control method has the advantage that the reversible belt tensioner is controlled directly as a function of the vehicle deceleration to be made. As a result, the belt force is always increased when the occupant would be subject to increased forward displacement due to the vehicle deceleration to be made. This occupant forward displacement is then minimized by the increased restraining force by the controlled reversible belt tensioner or else prevented. The vehicle deceleration made by the vehicle speed control device can take place in any desired manner, such as, for example, brake intervention, injection suppression, throttle control, switching from engine to generator operation of an electric drive, etc. Important in the invention is merely that the reversible belt tensioner is driven coupled to the vehicle to be made delay.
Die Speichereinheiten und Vergleichseinrichtungen können der Fahrgeschwindigkeitsregeleinrichtung, dem reversiblen Gurt- straffer einzeln oder gemeinsam zugeordnet sein oder auch als separate Einheiten ausgebildet sein.The storage units and comparison devices may be assigned individually or jointly to the vehicle speed control device, the reversible belt tensioner, or may also be designed as separate units.
Ferner wird vorgeschlagen, dass die fahrsicherheitsrelevanten Kenngrößen aus einer oder mehreren der folgenden Größen gebildet sind,Furthermore, it is proposed that the driving safety-relevant parameters are formed from one or more of the following variables,
-dem Abstand zu dem nächsten in Fahrtrichtung befindlichen Objekt, -der Geschwindigkeitsdifferenz zu dem nächsten in Fahrtrichtung befindlichen Objekt,the distance to the next object in the direction of travel, the speed difference to the next object in the direction of travel,
-dem Schlupf zwischen den Rädern und der Fahrbahn, -ein von extern dem Kraftfahrzeug übermitteltes Signal, -ein durch ein Fehlerdiagnosesystem im Kraftfahrzeug erkannter Fehler.-the slip between the wheels and the road, -a signal transmitted externally to the motor vehicle, -an error detected by a fault diagnosis system in the motor vehicle.
Der Abstand und die Geschwindigkeit zu dem nächsten in Fahrtrichtung befindlichen Objekt stellen sehr wichtige Kenngrößen dar, durch welche z.B. die Situation eines dicht vor dem Fahr- zeug einscherenden zweiten Fahrzeuges, eines Auffahrens auf ein Stauende oder auch ein in Fahrtrichtung vor dem Fahrzeug befindlicher feststehender Brückenpfeiler zur Regelung der Fahrgeschwindigkeit berücksichtigt werden. Ferner wird vorge- schlagen, den Schlupf zwischen den Rädern und der Fahrbahn zu berücksichtigen, wodurch das plötzliche Durchdrehen der Räder auf glatter Fahrbahn berücksichtigt werden kann. Die Fahrgeschwindigkeit wird dann automatisch soweit reduziert, bis der Schlupf einen akzeptierten Sollwert unterschreitet und die fahrkritische Situation beendet ist.The distance and the speed to the next object located in the direction of travel represent very important parameters, by which, for example, the situation of a second vehicle shattering in front of the vehicle, an approach to a jam end or also a stationary bridge pier in front of the vehicle in the direction of travel be taken into account for controlling the driving speed. Furthermore, it is to consider the slip between the wheels and the roadway, which can take into account the sudden slipping of the wheels on slippery roads. The driving speed is then automatically reduced until the slip falls below an accepted target value and the driving-critical situation is completed.
Eine weitere bevorzugte Ausbildung des Steuerungsverfahrens besteht darin, dass in der Speichereinheit mehrere vorgegebene Grenzwerte der Fahrzeugverzögerungen gespeichert sind und der reversible Gurtstraffer bei Überschreiten der Grenzwerte unterschiedlich angesteuert wird. Die vorgegebenen Grenzwerte können z.B. derart gestuft sein, dass für größere zu erwartende Fahrzeugverzögerungen der Gurtstraffer eine höhere Straff- kraft erzeugt oder bei Überschreiten einer Fahrzeugverzögerung, welche auf einen unvermeidbaren Unfall schließen lässt, nicht angesteuert wird, sofern ein irreversibler Gurtstraffer vorgesehen ist, der angesteuert wird und durch den reversiblen Gurtstraffer in seiner Funktion nicht gestört werden soll. Ferner ist denkbar, den reversiblen Gurtstraffer auch bei Ü- berschreiten einer vorgegebenen Fahrzeugbeschleunigung anzusteuern, so dass dem Insassen auch beim „Gasgeben" ein Gefühl eines aktiven SicherheitsgurtSystems vermittelt wird.A further preferred embodiment of the control method is that several predetermined limit values of the vehicle decelerations are stored in the memory unit and the reversible belt tensioner is controlled differently when the limit values are exceeded. The predetermined limits may be e.g. be stepped such that for larger anticipated vehicle decelerations of the belt tensioner generates a higher tension force or is exceeded when exceeding a vehicle deceleration, which suggests an unavoidable accident, not driven, if an irreversible belt tensioner is provided, which is controlled by the reversible The belt tensioner should not be disturbed in its function. Furthermore, it is conceivable to control the reversible belt tensioner even when a predetermined vehicle acceleration is exceeded, so that the occupant is also given a feel of an active safety belt system when "accelerating".
Nachfolgend wird die Erfindung anhand eines bevorzugten Ausführungsbeispieles näher erläutert, wobei in den Figuren im Einzelnen zu erkennen ist :The invention will be explained in more detail below with reference to a preferred exemplary embodiment, it being possible to see in detail in the figures:
Fig.l: Kraftfahrzeug mit Fahrgeschwindigkeitsregeleinrich- tung und Sicherheitsgurtsystem mit reversiblem GurtstrafferFig.l: Motor vehicle with Fahrgeschwindigkeitsregeleinrich- direction and seat belt system with reversible belt tensioner
Fig.2: Sicherheitsgurtsystem mit reversiblem Gurtstraffer Fig .3 : Fahrgeschwindigkeitsregeleinrichtung mit Speichereinheit und Auswerteeinheit zur Ansteuerung des reversiblen GurtstraffersFig.2: Safety belt system with reversible belt tensioner FIG. 3: Travel speed control device with memory unit and evaluation unit for controlling the reversible belt tensioner
Fig.4: Fahrsicherheitskritische Fahrsituation mit den zwei KraftfahrzeugenFig.4: driving safety critical driving situation with the two vehicles
In Fig.l ist ein Kraftfahrzeug 1 mit einem Antriebsaggregat 2 und den Rädern 3 in Sicht von oben symbolisiert zu erkennen, Ferner ist ein Insasse auf einem Fahrzeugsitz 7 zu erkennen, der durch einen Sicherheitsgurt 8 gegenüber dem Kraftfahrzeug 1 gesichert ist. Der Sicherheitsgurt 8 ist, wie auch in der Fig.2 zu erkennen ist, als Dreipunktgurt ausgeführt und mit seinen Enden über einen Endbeschlag 14 und einen mit einem reversiblen Gurtstraffer 6 und einem irreversiblen Gurtstraffer 17 versehenen Gurtaufroller an dem Kraftfahrzeug 1 befestigt. Ferner ist der Sicherheitsgurt 8 mittels einer Gurtzunge in einem Gurtschloss 9 befestigt. Der reversible Gurtstraffer 6 und der irreversible Gurtstraffer 17 sind hier dem Gurtaufrol- ler zugeordnet, können aber auch mit gleicher Wirkung demIn Fig.l motor vehicle 1 with a drive unit 2 and the wheels 3 in top view symbolized to recognize further, an occupant can be seen on a vehicle seat 7, which is secured by a seat belt 8 relative to the motor vehicle 1. The safety belt 8 is, as can also be seen in FIG. 2, designed as a three-point belt and fastened with its ends to the motor vehicle 1 via an end fitting 14 and a belt retractor provided with a reversible belt tensioner 6 and an irreversible belt tensioner 17. Furthermore, the safety belt 8 is fastened in a belt lock 9 by means of a belt tongue. The reversible belt tensioner 6 and the irreversible belt tensioner 17 are assigned here to the belt reel-up, but can also be used with the same effect
Gurtschloss 9, dem Endbeschlag 14 oder dem oberen Umlenkpunkt einzeln oder gemeinsam zugeordnet sein. In Fig.l ist ferner eine Einrichtung 4 zur Ermittlung von fahrsicherheitsrelevan- ten Kenngrößen K dargestellt, welche die ermittelten Daten an eine Fahrgeschwindigkeitsregeleinrichtung 5 übermittelt. Fahrgeschwindigkeitsregeleinrichtungen sind z.B. unter den Begriffen ACC (Adaptive Cruise Control) oder aktive Geschwindigkeitsregelung bekannt. Der Fahrer kann dabei eine Wunschgeschwindigkeit einstellen, die das Fahrzeug selbstständig ein- hält. So wird z.B. die Fahrgeschwindigkeit auch bei plötzlichen Steigungen oder Gefällen durch selbsttätiges Gasgeben o- der Gaswegnehmen auf die Wunschgeschwindigkeit nachgeregelt . Ferner ist die Fahrgeschwindigkeitsregeleinrichtung 5 zur An- Steuerung des reversiblen Gurtstraffers 6 mit diesem über eine Signalleitung verbunden. In der Fig.3 und 4 ist die Funktionsweise der Fahrgeschwindigkeitsregeleinrichtung 5 und die Ansteuerung des reversiblen Gurtstraffers 6 und irreversiblen Gurtstraffers 17 näher dargestellt. Zunächst werden von der Einrichtung 4 die fahrsicherheitsrelevanten Kenngrößen K ermittelt. Diese können z.B. der Abstand S oder die Geschwindigkeitsdifferenz Δ V zu dem nächsten in Fahrtrichtung befindlichen Objekt sein oder der aktuelle Schlupf T oder ein externes Signal E eines Verkehrsleitsystems zur Regelung der Fahrgeschwindigkeit oder auch die Ermittlung eines Fehlers F durch ein Fehlerdiagnosesystem, wie z.B. Ausfall einer Bremse, plötzlicher Ölverlust etc. sein. Die ermittelten Kenngrößen K werden dann einer ersten Vergleichseinrichtung 15 zugeführt, in der diese mit vorgegebenen aus einer ersten Speichereinheit 16 ausgelesenen Grenzwerten KG verglichen werden. Für den Fall, dass die vorgegebenen Grenzwerte KG überschritten sind, ermittelt die Fahrgeschwindigkeitsregeleinrichtung 5 eine vorzunehmende Fahrzeugverzögerung ar nach einer vorgegebenen Funktion ar = f (K) . Diese vorzunehmende Fahrzeugverzögerung ar wird dann der Steuerung des Antriebsaggregates 2 bzw. den Rädern 3 zugeführt, so dass die Fahrgeschwindigkeit durch Bremseneingriff, Eingriff in die Motorsteuerung etc. entsprechend reduziert wird. Ferner wird der ermittelte Wert der vorzunehmenden Fahr- zeugverzögerung ar einer zweiten Vergleichseinrichtung 11 zugeführt, in der diese mit einer aus einer zweiten Speichereinheit 10 ausgelesenen vorgegebenen Fahrzeugverzögerung aβ verglichen wird. Ist die vorzunehmende Fahrzeugverzögerung ar größer als die vorgegebene Fahrzeugverzögerung ac wird der rever- sible Gurtstraffer 6 angesteuert und die Rückhaltekraft des Insassen durch den Sicherheitsgurt 8 entsprechend erhöht . Im Idealfall erfolgt das Anstraffen des Sicherheitsgurtes 8 bereits vor der eigentlichen vorgenommenen Fahrzeugverzögerung ar, so dass der Sicherheitsgurt 8 gerade noch angestrafft wird, wenn der Insasse noch keine Vorwärtsverlagerung aufgrund der vorgenommenen Fahrzeugverzögerung ar ausführt . Damit ist die Gurtkraft bereits zu Beginn der Insassenverzögerung erhöht und der Insasse zu einem frühestmöglichen Zeitpunkt an die Fahrzeugverzögerung angekoppelt . Es können dabei verschiedene vorgegebene Grenzwerte der vorzunehmenden Fahrzeugverzögerungen aci,aG2,aG3 usw. vorgesehen sein, denen verschiedene zu erzeugende Gurtkräfte des reversiblen Gurtstraffers 6 zugeordnet sind. So hat es sich als sinnvoll erwiesen, den Sicherheitsgurt 8 bereits bei einer vorzunehmenden Fahrzeugverzögerung von 0,3g mit einer Straffkraft von 50-150 N und bei einer vorzunehmenden Fahrzeugverzögerung von 0,45g mit einer Straffkraft von 100-250 N anzuziehen. Ferner hat es sich als zweckmäßig her- ausgestellt, den reversiblen Gurtstraffer 6 bei Überschreiten eines noch höher gesetzten Grenzwertes der vorzunehmenden Fahrzeugverzögerung ao3 nicht anzusteuern, sofern in diesem Fall ein irreversibler Gurtstraffer 17 angesteuert wird, der durch den reversiblen Gurtstraffer 6 gestört werden könnte.Belt lock 9, the end fitting 14 or the upper deflection point individually or jointly assigned. FIG. 1 also shows a device 4 for determining driving safety-relevant parameters K, which transmits the determined data to a vehicle speed control device 5. Driving speed control devices are known, for example, under the terms ACC (Adaptive Cruise Control) or active cruise control. The driver can set a desired speed which the vehicle automatically adopts. Thus, for example, the driving speed is readjusted to the desired speed, even in the case of sudden inclines or inclines, by automatically accelerating or decelerating. Furthermore, the driving speed control device 5 is Control of the reversible belt tensioner 6 connected to this via a signal line. In Figures 3 and 4, the operation of the vehicle speed control device 5 and the control of the reversible belt tensioner 6 and irreversible belt tensioner 17 is shown in more detail. First of all, the facility 4 determines the driving safety-relevant parameters K. These may be, for example, the distance S or the speed difference ΔV to the next object in the direction of travel or the current slip T or an external signal E of a traffic control system for controlling the driving speed or even the determination of an error F by a fault diagnosis system, such as failure of a Brake, sudden oil loss, etc. The determined parameters K are then fed to a first comparison device 15, in which these are compared with predetermined limits KG read out from a first memory unit 16. In the event that the predetermined limit values KG are exceeded, the vehicle speed control device 5 determines a vehicle deceleration a r to be made according to a predetermined function a r = f (K). This vehicle deceleration a r to be performed is then fed to the control of the drive unit 2 or the wheels 3, so that the driving speed is correspondingly reduced by brake intervention, intervention in the engine control system. Furthermore, the determined value of the vehicle deceleration a r to be undertaken is supplied to a second comparison device 11 in which it is compared with a predetermined vehicle deceleration aβ read from a second memory unit 10. If the vehicle deceleration ar is greater than the predetermined vehicle deceleration ac, the rever- sible belt tensioner 6 is actuated and the restraining force of the occupant is correspondingly increased by the safety belt 8. Ideally, the tightening of the seat belt 8 takes place even before the actual vehicle deceleration ar, so that the seat belt 8 is barely tightened when the occupant still performs no forward displacement due to the made vehicle deceleration a r . Thus, the belt force is already increased at the beginning of the occupant delay and coupled to the occupant at the earliest possible time to the vehicle deceleration. Various predetermined limit values of the vehicle decelerations aci, aG2, aG3, etc., to be undertaken may be provided, to which different belt forces of the reversible belt tensioner 6 to be generated are assigned. Thus, it has proven to be useful to tighten the seat belt 8 already with a vehicle deceleration of 0.3 g with a tension of 50-150 N and a vehicle deceleration of 0.45 g with a tension of 100-250 N. Furthermore, it has proven to be expedient not to actuate the reversible belt tensioner 6 when an even higher limit value of the vehicle deceleration ao3 is to be exceeded, provided that in this case an irreversible belt tensioner 17 is actuated which could be disturbed by the reversible belt tensioner 6.
In Fig.4 ist beispielhaft eine Fahrsituation mit den Kraftfahrzeugen A und B zu erkennen. In dem Kraftfahrzeug A ist eine erfindungsgemäße Ansteuerung des Gurtstraffers vorgesehen. Fahrzeug B überholt Fahrzeug A, so dass der vorgegebene Min- destabstand SG unterschritten ist. Daraufhin wird der reversible Gurtstraffer angesteuert und die Fahrgeschwindigkeit reduziert. Der Insasse spürt bei diesem Vorgang sowohl die Geschwindigkeitsreduzierung als auch die frühzeitige Erhöhung der Rückhaltekraft als miteinander gekoppelte Vorgänge, die sich sinnvoll ergänzen und hat damit ein positives Gefühl der aktiven Sicherheit. Alternativ kann die vorzunehmende Fahrzeugverzögerung auch durch die Übermittlung eines externen Signales E von einem externen Verkehrsleitsystem 12 oder von einem Signalgeber 13 zur einmaligen Reduzierung der Fahrgeschwindigkeit erzeugt werden. 4 shows a driving situation with the motor vehicles A and B by way of example. In the motor vehicle A an activation of the belt tensioner according to the invention is provided. Vehicle B overtakes vehicle A, so that the predetermined minimum distance SG has fallen below. Then the reversible belt tensioner is activated and the driving speed is reduced. The occupant senses in this process both the speed reduction and the early increase of the restraint force as coupled operations that complement each other meaningfully and thus has a positive sense of active safety. Alternatively, the vehicle deceleration to be made can also be achieved by the transmission of an external signal E from an external traffic management system 12 or a signal generator 13 for the one-time reduction of the driving speed are generated.
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008014393 | 2008-03-17 | ||
| DE102008014393.6 | 2008-03-17 |
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| Publication Number | Publication Date |
|---|---|
| WO2009115185A1 true WO2009115185A1 (en) | 2009-09-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2009/001508 Ceased WO2009115185A1 (en) | 2008-03-17 | 2009-03-04 | Seat belt system having a reversible belt tensioner and control method for a reversible belt tensioner |
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| Country | Link |
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| WO (1) | WO2009115185A1 (en) |
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| FR2987015A1 (en) * | 2012-02-17 | 2013-08-23 | Peugeot Citroen Automobiles Sa | System for protecting passengers of car during collision, has determination unit determining longitudinal deceleration of vehicle, where system tests veracity of condition and controls tensioning device activation based on test result |
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