WO2008052608A1 - Method for triggering a reversible belt tensioner of a safety belt in a motor vehicle - Google Patents

Method for triggering a reversible belt tensioner of a safety belt in a motor vehicle Download PDF

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Publication number
WO2008052608A1
WO2008052608A1 PCT/EP2007/006928 EP2007006928W WO2008052608A1 WO 2008052608 A1 WO2008052608 A1 WO 2008052608A1 EP 2007006928 W EP2007006928 W EP 2007006928W WO 2008052608 A1 WO2008052608 A1 WO 2008052608A1
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WO
WIPO (PCT)
Prior art keywords
belt
vehicle
tensioner
detected
belt tensioner
Prior art date
Application number
PCT/EP2007/006928
Other languages
German (de)
French (fr)
Inventor
Werner Bernzen
Dominic Reutter
Original Assignee
Daimler Ag
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Filing date
Publication date
Application filed by Daimler Ag filed Critical Daimler Ag
Publication of WO2008052608A1 publication Critical patent/WO2008052608A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/36—Belt retractors, e.g. reels self-locking in an emergency
    • B60R22/415—Belt retractors, e.g. reels self-locking in an emergency with additional means allowing a permanent locking of the retractor during the wearing of the belt
    • 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
    • B60R21/0134—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 imminent contact with an obstacle, e.g. using radar systems
    • 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
    • B60R2021/01122—Prevention of malfunction
    • B60R2021/01184—Fault detection or diagnostic circuits
    • 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
    • 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
    • B60R2021/01304—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 monitoring rough road condition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
    • B60R2022/4666—Reels with means to tension the belt in an emergency by forced winding up characterised by electric actuators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
    • B60R2022/469—Reels with means to tension the belt in an emergency by forced winding up reusable

Definitions

  • the invention relates to a method for controlling a reversible belt tensioner of a safety belt in a motor vehicle according to the preamble of patent claim 1.
  • Conventional restraint belt systems in automobiles include a wind-up mechanism for automatically winding the loose webbing around a belt spool.
  • the automatic winding ensures that the applied belt loosely and comfortably rests against the body of an occupant and is rolled up when not using the seat belt around the belt reel (comfort state).
  • the unwinding of the belt in the comfort state is easily possible with a belt on to give the occupants extensive freedom of movement. In this case, a low torque is generated against the unwinding direction by a return spring.
  • a belt pullout is additionally available. This prevents from a predetermined acceleration of the belt reel in the unwinding and / or from a predetermined acceleration of the vehicle, the unwinding of the webbing.
  • These include a belt-sensitive sensor and a vehicle-sensitive sensor provided, which are usually part of the belt system. The response of one of these two sensors, for example, the vehicle-sensitive acceleration sensor due to a lying above a threshold acceleration of the vehicle (blocking threshold) prevents unwinding of the webbing.
  • reversible belt tensioners In vehicles reversible belt tensioners are used, which can be triggered several times, even in rapid succession, to shorten the loose webbing in an accident and / or to pull an occupant to the back of the seat out in a position with reduced risk of injury.
  • These reversible belt tensioners can have different drives.
  • a reversible belt tensioner can be driven by an electric motor, which acts permanently or via a clutch controllable on the belt reel.
  • Such reversible belt tensioners allow a tightening of the seat belt with predetermined strength, specifiable speed and predetermined time.
  • the multiple releasability of the reversible belt tensioner enables it to be triggered in a preventative manner.
  • a reversible belt tensioner can also be used for haptic warning of the driver in safety-critical situations.
  • a seized normal driving operation is present if the assessment of the situation by a control unit or a hazard computer does not indicate a safety-critical situation, or if the necessary for the release of the belt tensioner condition is no longer met.
  • a condition may be the presence or absence of a particular signal on a data bus or a data line. If, for example, a critical driving situation or a critical object approach is no longer present, it is assumed that the dangerous situation has ended.
  • a pawl is to be solved by a blocking teeth in a conventional blocking in motor vehicles.
  • electromechanically there is also the possibility of the electromotive drive of the belt tensioner for a short time or to control a small angle of rotation in the winding.
  • an indicative of the opening of the blocking device size is detected and the belt tensioner is controlled in such a way that the belt reel just turns so far that the blocking device of the belt reel opens and the webbing for unwinding releases.
  • the belt tensioner is controlled in such a way that the belt reel just turns so far that the blocking device of the belt reel opens and the webbing for unwinding releases.
  • the belt pull-out lock it is only possible to open the blocking device if at the same time neither the vehicle-sensitive nor the belt-sensitive sensor activates the belt pull-out lock.
  • the case may occur that a return to the comfort state is prevented due to a belt-sensitive or a vehicle-sensitive sensor, which are usually mechanically coupled to the belt pullout. If the belt pullout is effective, it is no longer possible to handle the streamlined webbing and the freedom of movement of an occupant is severely limited.
  • the drive of the belt tensioner is driven in an opening mode in such a way that initially in a winding phase, the belt reel rotates by a certain angle in the winding, and is driven in a subsequent holding phase, the drive of the belt tensioner for a predetermined holding time, that the belt reel is held in its angular position.
  • a belt-sensitive sensor can respond in particular if, after a belt tightening, a released belt is released while it is under a tensile load. If the unwinding of the webbing is too fast, the belt-sensitive sensor responds and the belt-extractor lock is usually mechanically activated and effective. According to EP1451045B1 therefore an indicative of the belt force size is detected and only when it suggests a decrease in the belt force initiates an opening mode.
  • the Gurtauszugssperre is effective even when the vehicle-sensitive acceleration sensor responds due to the vehicle movement, such as a braking or steering maneuver, a strong sway of the vehicle or a fast cornering.
  • the opening mode of the belt tensioner is requested in a release time, which is determined by means of an algorithm based on a model of the acceleration sensor using at least one variable characterizing the driving dynamics.
  • safety belts always have two independent locking mechanisms due to legal regulations, namely a belt-sensitive and an acceleration-sensitive lock.
  • the acceleration-sensitive lock locks the belt extension when a resulting vehicle acceleration above a blocking threshold of 0.3 g occurs, all three force components, so in the x-, y-, and z-direction come to bear.
  • the method using a sensor provided in the antilock brake control (ABS) of the vehicle provides information about the physical profile of the road surface, which can be used in real time for cruise control, suspension adaptation or for forecasting in a navigation device.
  • ABS antilock brake control
  • the object of the invention is to improve the safety, reliability and comfort of a restraint belt system with a reversible belt tensioner. This object is solved by the features of claim 1.
  • a reversible belt tensioner in a motor vehicle is triggered as a result of a detected dangerous situation, then a restraint belt of a belt system is tightened.
  • the belt system comprises a belt pull-out lock which can be activated by an acceleration sensor and which, when activated, causes the restraining belt to be unwound from a belt reel.
  • the belt tensioner is driven with a release signal to allow the free unwinding of the webbing and to bring about release of the Gurtauszugssperre.
  • it is detected in a poor road recognition by means of sensors whether the vehicle is moving on a poor road.
  • the release signal can only be set if it can be ruled out by means of the bad path recognition that the vehicle is moving on a poor road. In other words, a release signal can only be set if there is no bad path.
  • Bad travel can be achieved by different evaluations of sensor signals, e.g. detected in the ESP control unit. For example, increased levels of noise in the signals from the sensors for wheel speeds, longitudinal and lateral acceleration or yaw rate give indications of the road surface. Methods for determining the roughness of the driving surface are well known in the art.
  • a poor road can also be evaluated by evaluating the signals from vertical acceleration sensors Vehicle structure or spring travel sensors are detected, which contain suggestions from the road surface. As such, evaluation methods are well known in the art.
  • the sensors are typically used for comfort applications such as active damper control or Active Body Control (ABC). Due to the networking of all sensor signals by means of an information bus system, these sensor signals can also be used to conclude on the road condition. It is particularly advantageous to evaluate the different, available sensor signals in parallel and to use them for mutual plausibility.
  • the single FIGURE shows a flowchart of an advantageous embodiment of a method for controlling a reversible belt tensioner.
  • the method describes the control of the belt tensioner with a release signal to bring the belt back into a comfort state, after triggering the belt tensioner on the webbing acting blocking device the
  • Belt pullout lock has activated (blocking state). The process steps which have preceded which have led to the release of the belt tensioner are therefore not shown.
  • the control takes place in a release time, which initially using driving conditions
  • Driver activities and environmental data is determined.
  • other variables can also be used to determine the release time.
  • step 1 driving condition data such as wheel speeds, longitudinal and lateral acceleration, spin, yaw rate, yaw acceleration of the vehicle are detected or detected.
  • step 2 the driving state data are compared with the threshold value and, when the thresholds are not reached, they are concluded that the dangerous situation has ended.
  • step 3 data about the driver's activities is detected or determined, e.g. Brake pedal operation, accelerator operation, steering angle, alertness, load and the like. These data are compared with thresholds for further processing in step 4 and closed when the thresholds are below a risk situation.
  • step 5 environmental data of an environmental sensor system, such as radar, infrared distance measurement, imaging or short-range communication, are detected and evaluated with respect to a critical approach to a collision object.
  • step 6 a query is made as to whether the environmental data indicate that the dangerous situation has ended.
  • the results of the queries in steps 2, 4 and 6 are merged in step 7.
  • a point in time is determined at which the monitored variables are below the respectively predefinable threshold values or if all data are indicative of termination of the dangerous situation.
  • both the current time and a future time may be determined, e.g. including a mathematical model for the acceleration sensor of the blocking device, as disclosed in EP1644226A1.
  • step 8 further criteria are queried, which must be met to release a belt pullout.
  • the result of a bad road recognition 9 is queried, which determines by means of sensors, whether the vehicle is moving on a poor road.
  • sensors are used as they are also used to record the driving condition data in step 1.
  • step 10 of the reversible belt tensioner are controlled to release the belt pullout and thus to put the belt system from the blocking state in the comfort state.
  • the belt tensioner on an acting on the belt reel electromotive drive which when activated with the release signal, the belt spool as far as Winding rotates that in the blocking device, the teeth of a pawl of a complementary, with the belt spool mitfitenden teeth can be solved, whereby the Gurtauszugssperre is released.
  • the query carried out in step 8 can also take place at another time, for example, before step 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Automotive Seat Belt Assembly (AREA)

Abstract

The invention relates to a method for triggering a reversible belt tensioner (1) of a safety belt in a motor vehicle, wherein the safety belt has a blocking device as a belt unwinding lock, which acts upon the belt reel in the unwinding direction, which reacts in a locking manner upon the occurrence of a vehicle acceleration beyond a blocking threshold. Upon the release of the belt tensioner due to a dangerous situation (7) the belt tensioner is triggered by means of a release signal in order to bring about the release of the belt unwinding lock from a blocking condition to a comfort-providing condition. The invention provides that sensors (1) detect in a rough road recognition (9) whether the vehicle is moving on a rough road section, and a release signal is set only, if no rough road section is present.

Description

Verfahren zur Ansteuerung eines reversiblen Gurtstraffers eines Sicherheitsgurtes in einem Kraftfahrzeug Method for controlling a reversible belt tensioner of a safety belt in a motor vehicle
Die Erfindung betrifft ein Verfahren zur Ansteuerung eines reversiblen Gurtstraffers eines Sicherheitsgurtes in einem Kraftfahrzeug nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for controlling a reversible belt tensioner of a safety belt in a motor vehicle according to the preamble of patent claim 1.
Übliche Rückhaltegurtsysteme in Kraftfahrzeugen umfassen einen Aufwickelmechanismus zum automatischen Aufwickeln des losen Gurtbandes um eine Gurtspule. Durch das automatische Aufwickeln wird erreicht, dass der angelegte Gurt locker und komfortabel am Körper eines Insassen anliegt und bei Nichtgebrauch des Sicherheitsgurts um die Gurtspule aufgerollt ist (Komfortzustand) . Das Abwickeln des Gurts im Komfortzustand ist bei angelegtem Gurt leicht möglich, um den Insassen weitgehende Bewegungsfreiheit zu verschaffen. Hierbei wird von einer Rückzugsfeder ein geringes Drehmoment entgegen der Abwickelrichtung erzeugt.Conventional restraint belt systems in automobiles include a wind-up mechanism for automatically winding the loose webbing around a belt spool. The automatic winding ensures that the applied belt loosely and comfortably rests against the body of an occupant and is rolled up when not using the seat belt around the belt reel (comfort state). The unwinding of the belt in the comfort state is easily possible with a belt on to give the occupants extensive freedom of movement. In this case, a low torque is generated against the unwinding direction by a return spring.
Damit ein solches Gurtsystem einen Insassen im Falle einer Kollision zurückhalten kann, ist zusätzlich eine Gurtauszugssperre vorhanden. Diese verhindert ab einer vorgegebenen Beschleunigung der Gurtspule in Abwickelrichtung und/oder ab einer vorgegebenen Beschleunigung des Fahrzeugs das Abwickeln des Gurtbandes . Hierzu sind ein gurtbandsensitiver Sensor und ein fahrzeugsensitiver Sensor vorgesehen, welche in der Regel Bestandteil des Gurtsystems sind. Das Ansprechen eines dieser beiden Sensoren, beispielsweise des fahrzeugsensitiven Beschleunigungssensors aufgrund einer über einem Schwellwert liegenden Beschleunigung des Fahrzeugs (Blockierschwelle) verhindert ein Abwickeln des Gurtbandes.In order for such a belt system can restrain an occupant in the event of a collision, a belt pullout is additionally available. This prevents from a predetermined acceleration of the belt reel in the unwinding and / or from a predetermined acceleration of the vehicle, the unwinding of the webbing. These include a belt-sensitive sensor and a vehicle-sensitive sensor provided, which are usually part of the belt system. The response of one of these two sensors, for example, the vehicle-sensitive acceleration sensor due to a lying above a threshold acceleration of the vehicle (blocking threshold) prevents unwinding of the webbing.
In Fahrzeugen werden reversible Gurtstraffer eingesetzt, welche mehrmals, auch schnell hintereinander, ausgelöst werden können, um bei einem Unfall das lose Gurtband zu verkürzen und/oder einen Insassen zur Rückenlehne des Sitzes hin in eine Position mit verringerter Verletzungsgefahr zu ziehen. Diese reversiblen Gurtstraffer können unterschiedliche Antriebe aufweisen. Beispielsweise kann ein reversibler Gurtstraffer durch einen Elektromotor angetrieben werden, welcher dauerhaft oder über eine Kupplung steuerbar auf die Gurtspule wirkt. Solche reversiblen Gurtstraffer ermöglichen eine Straffung des Sicherheitsgurts mit vorgebbarer Stärke, vorgebbarer Geschwindigkeit und vorgebbarer Zeitdauer. Insbesondere wird durch die mehrfache Auslösbarkeit des reversiblen Gurtstraffers ein vorbeugendes Auslösen desselben ermöglicht. Ein vorbeugendes Auslösen bedeutet, dass der Gurtstraffer in sicherheitskritischen Fahrsituationen ausgelöst wird, welche beispielsweise von Fahrdynamiksensoren oder Fahrzeugumgebungssensoren ermittelt werden, oder auf welche durch die Auswertung von Fahrerreaktionen wie Bremspedalbetätigung oder Lenkwinkeleinschlag geschlossen wird. Über ein vorbeugendes Auslösen hinaus kann ein reversibler Gurtstraffer auch zur haptischen Warnung des Fahrers in sicherheitskritischen Situationen eingesetzt werden.In vehicles reversible belt tensioners are used, which can be triggered several times, even in rapid succession, to shorten the loose webbing in an accident and / or to pull an occupant to the back of the seat out in a position with reduced risk of injury. These reversible belt tensioners can have different drives. For example, a reversible belt tensioner can be driven by an electric motor, which acts permanently or via a clutch controllable on the belt reel. Such reversible belt tensioners allow a tightening of the seat belt with predetermined strength, specifiable speed and predetermined time. In particular, the multiple releasability of the reversible belt tensioner enables it to be triggered in a preventative manner. A preventative triggering means that the belt tensioner is triggered in safety-critical driving situations, which are determined, for example, by driving dynamics sensors or vehicle environment sensors, or which is concluded by the evaluation of driver reactions such as brake pedal actuation or steering angle impact. In addition to a preventative triggering, a reversible belt tensioner can also be used for haptic warning of the driver in safety-critical situations.
Es ist wünschenswert, dass der Gurt nach einer vorbeugenden Straffung ohne nachfolgenden Unfall und nach Beendigung der Gefahrensituation und bei sichergestelltem Normalfahrbetrieb freigegeben wird und wieder locker und komfortabel am Insassen anliegt. Ein sichergestellter Normalfahrbetrieb liegt vor, wenn die Bewertung der Situation durch ein Steuergerät oder einen Gefahrenrechner keine sicherheitskritische Situation anzeigt, beziehungsweise wenn die für die Auslösung des Gurtstraffers notwendige Bedingung nicht mehr erfüllt ist. Eine solche Bedingung kann das Vorhandensein oder das Fehlen eines bestimmten Signals auf einem Datenbus oder einer Datenleitung sein. Wenn z.B. eine fahrdynamisch kritische Situation oder eine kritische Objektannäherung nicht mehr vorliegt, wird davon ausgegangen, dass die Gefahrensituation beendet ist.It is desirable that the belt after a preventive tightening without subsequent accident and after completion of the Hazardous situation and in case of normal driving operation is released and again loosely and comfortably applied to the occupant. A seized normal driving operation is present if the assessment of the situation by a control unit or a hazard computer does not indicate a safety-critical situation, or if the necessary for the release of the belt tensioner condition is no longer met. Such a condition may be the presence or absence of a particular signal on a data bus or a data line. If, for example, a critical driving situation or a critical object approach is no longer present, it is assumed that the dangerous situation has ended.
Nach einer mittels eines Gurtstraffers durchgeführten Straffung des Sicherheitsgurts und einer anschließend mittels eines Gefahrenrechners erkannten Beendigung der Gefahrensituation sollte der Sicherheitsgurt schnellstmöglich wieder in den Komfortzustand überführt werden. Um das Gurtband wieder freizugeben, ist bei einer in Kraftfahrzeugen üblichen Blockiervorrichtung eine Sperrklinke von einer Blockierverzahnung zu lösen. Hierzu gibt es verschiedene Möglichkeiten. Neben einer aktorischen Lösung, bei der eine Ausrückung der Verzahnung elektromechanisch erfolgt, gibt es auch die Möglichkeit den elektromotorischen Antrieb des Gurtstraffer kurzzeitig oder um einen geringen Drehwinkel in Aufwickelrichtung anzusteuern. Gemäß der EP1339575B1 wird eine für das Öffnen der Blockiervorrichtung indikative Größe erfasst und der Gurtstraffer in der Weise angesteuert, dass sich die Gurtspule gerade soweit dreht, dass sich die Blockiervorrichtung der Gurtspule öffnet und das Gurtband zum Abwickeln freigibt. Ein Öffnen der Blockiervorrichtung ist jedoch nur möglich, wenn gleichzeitig weder der fahrzeugsensitive noch der gurtbandsensitive Sensor die Gurtauszugssperre aktivieren. Insbesondere kann der Fall eintreten, dass aufgrund eines gurtbandsensitiven oder eines fahrzeugsensitiven Sensors, welche mit der Gurtauszugssperre zumeist mechanisch gekoppelt sind, eine Rückkehr in den Komfortzustand verhindert wird. Ist die Gurtauszugssperre wirksam, so ist es nicht mehr möglich das gestraffte Gurtband abzuwickeln und die Bewegungsfreiheit eines Insassen ist stark eingeschränkt. Gemäß der EP1339574B1 wird daher der Antrieb des Gurtstraffers in einem Öffnungsmodus in der Weise angesteuert, dass zunächst in einer Aufwickelphase sich die Gurtspule um einen bestimmten Drehwinkel in Aufwickelrichtung dreht, und in einer anschließenden Haltephase der Antrieb des Gurtstraffers für eine vorgebbare Haltezeit so angesteuert wird, dass die Gurtspule in Ihrer Winkelstellung gehalten wird. Mit dieser Maßnahme kann ein Zeitverzug zwischen Beendigung der Gefahrensituation und Freigabe der Gurtauszugssperre überbrückt werden.After a tightening of the seatbelt by means of a belt tensioner and then a termination of the dangerous situation detected by means of a danger computer, the seatbelt should be returned to the comfort state as quickly as possible. To release the strap again, a pawl is to be solved by a blocking teeth in a conventional blocking in motor vehicles. There are various possibilities for this. In addition to an actuatoric solution in which a disengagement of the teeth is done electromechanically, there is also the possibility of the electromotive drive of the belt tensioner for a short time or to control a small angle of rotation in the winding. According to EP1339575B1 an indicative of the opening of the blocking device size is detected and the belt tensioner is controlled in such a way that the belt reel just turns so far that the blocking device of the belt reel opens and the webbing for unwinding releases. However, it is only possible to open the blocking device if at the same time neither the vehicle-sensitive nor the belt-sensitive sensor activates the belt pull-out lock. In particular, the case may occur that a return to the comfort state is prevented due to a belt-sensitive or a vehicle-sensitive sensor, which are usually mechanically coupled to the belt pullout. If the belt pullout is effective, it is no longer possible to handle the streamlined webbing and the freedom of movement of an occupant is severely limited. According to EP1339574B1 therefore, the drive of the belt tensioner is driven in an opening mode in such a way that initially in a winding phase, the belt reel rotates by a certain angle in the winding, and is driven in a subsequent holding phase, the drive of the belt tensioner for a predetermined holding time, that the belt reel is held in its angular position. With this measure, a time delay between completion of the dangerous situation and release of the belt extraction lock can be bridged.
Ein gurtbandsensitiver Sensor kann insbesondere dann ansprechen, wenn nach einer Gurtstraffung ein Freigeben eines gestrafften Gurts erfolgt, während dieser unter einer Zugbelastung steht. Erfolgt das Abwickeln des Gurtbandes zu schnell, so spricht der gurtbandsensitive Sensor an und die Gurtauszugssperre wird zumeist mechanisch angesteuert und wirksam. Gemäß der EP1451045B1 wird daher eine für die Gurtkraft indikative Größe erfasst und erst wenn diese auf ein Abnehmen der Gurtkraft hindeutet ein Öffnungsmodus eingeleitet . Die Gurtauszugssperre wird auch dann wirksam, wenn der fahrzeugsensitive Beschleunigungssensor aufgrund der Fahrzeugbewegung anspricht, beispielsweise bei einem Brems- oder Lenkmanöver, bei einem starken Schwanken des Fahrzeugs oder bei einer schnellen Kurvenfahrt. Gemäß der DE10332024A1 wird der Öffnungsmodus des Gurtstraffer in einem Lösezeitpunkt angefordert, welcher mittels eines auf einem Modell des Beschleunigungssensors basierenden Algorithmus unter Heranziehen mindestens einer die Fahrdynamik kennzeichnenden Größe ermittelt wird.A belt-sensitive sensor can respond in particular if, after a belt tightening, a released belt is released while it is under a tensile load. If the unwinding of the webbing is too fast, the belt-sensitive sensor responds and the belt-extractor lock is usually mechanically activated and effective. According to EP1451045B1 therefore an indicative of the belt force size is detected and only when it suggests a decrease in the belt force initiates an opening mode. The Gurtauszugssperre is effective even when the vehicle-sensitive acceleration sensor responds due to the vehicle movement, such as a braking or steering maneuver, a strong sway of the vehicle or a fast cornering. According to DE10332024A1, the opening mode of the belt tensioner is requested in a release time, which is determined by means of an algorithm based on a model of the acceleration sensor using at least one variable characterizing the driving dynamics.
Wie bereits eingangs dargestellt, haben Sicherheitsgurte aufgrund gesetzlicher Vorschriften immer zwei voneinander unabhängige Sperrmechanismen, nämlich eine gurtbandsensitive und eine beschleunigungssensitive Sperre . Die beschleunigungssensitive Sperre sperrt den Gurtbandauszug, wenn ein resultierende Fahrzeug-Beschleunigung oberhalb einer Blockierschwelle von 0,3 g auftritt, wobei alle 3 Kraft-Komponenten, also in x-, y- , und z-Richtung zum tragen kommen .As already mentioned, safety belts always have two independent locking mechanisms due to legal regulations, namely a belt-sensitive and an acceleration-sensitive lock. The acceleration-sensitive lock locks the belt extension when a resulting vehicle acceleration above a blocking threshold of 0.3 g occurs, all three force components, so in the x-, y-, and z-direction come to bear.
Seitens der Anmelderin wird nun folgendes Problem erkannt : Bei einer Schlechtwegfahrt, z.B. bei einer Geländefahrt abseits der Straße, wird aufgrund der starken vertikalen Anregungen (in z-Richtung) die beschleunigungssensitive Sperre den Gurtbandauszug sperren. Zwar werten Fahrdynamik-Algorithmen, mittels derer auch die Beendigung einer Gefahrensituation erkannt wird, Fahrzeug-Beschleunigung aus, um insbesondere Antiblockiersysteme (ABS) und elektronischen Stabilisierungsprogramme (ESP) anzusteuern, jedoch sind Beschleunigungssensoren nur für die x- und y- Achse vorgesehen. Ein Sensor zur Erfassung von Beschleunigungen in z-Richtung ist in Fahrdynamik-Steuergeräten typischerweise nicht vorgesehen. Dies kann zu einer Fehlansteuerung des Gurtstraffers führen, wenn nach Beendigung einer Gefahrensituation mittels eines Lösesignals der Gurtstraffer wieder deaktiviert werden soll, während aufgrund der Sperrung durch den beschleunigungssensitiven Sensor die Gurtauszugssperre für die Dauer der Schlechtwegfahrt nicht gelöst werden kann. Die Fehlansteuerung wird vom Insassen als unplausibel oder störend wahrgenommen.On the part of the Applicant, the following problem is now recognized: In a Schlechtwegfahrt, for example, when off-road off-road, due to the strong vertical stimuli (in the z-direction), the acceleration-sensitive lock lock the Gurtbandauszug. Although vehicle dynamics algorithms, by means of which the termination of a dangerous situation is recognized, evaluate vehicle acceleration, in particular in order to control anti-lock braking systems (ABS) and electronic stabilization programs (ESP), acceleration sensors are only provided for the x and y axes. A sensor for detecting accelerations in the z-direction is in Driving dynamics control devices typically not provided. This can lead to a faulty activation of the belt tensioner when the belt tensioner is to be deactivated again after completion of a dangerous situation by means of a release signal, while due to the blocking by the acceleration-sensitive sensor, the belt pullout for the duration of Schlechtwegfahrt can not be solved. The faulty control is perceived by the occupant as implausible or disturbing.
Es wird noch auf die in einem vollkommen anderen Zusammenhang bekannte DE 195 37 257 Al verwiesen. Darin ist ein Verfahren zur Ermittlung des physikalischen Profils einer Fahrbahnoberfläche offenbart, bei dem während der Bewegung eines Kraftfahrzeuges auf dieser Fahrbahnoberfläche, mittels der Signale eines Radsensors Amplitudenschwankungen von Radbewegungsparameter, insbesondere derReference is made to DE 195 37 257 A1, which is known in a completely different context. Therein a method for determining the physical profile of a road surface is disclosed, in which during the movement of a motor vehicle on this road surface, by means of the signals of a wheel sensor amplitude fluctuations of Radbewegungsparameter, in particular the
Radumdrehungsgeschwindigkeit als Maß für das physikalische Profil der Fahrbahnoberfläche ausgewertet werden. Das einen in der Antiblockierregelung (ABS) des Fahrzeugs vorhandenen Sensor nutzende Verfahren liefert Aussagen über das physikalische Profil der Fahrbahnoberfläche, die in Echtzeit für eine Geschwindigkeitsregelung, eine Fahrwerksadaption oder für die Vorausschau in einem Navigationsgerät verwendet werden kann.Radumdrehungsgeschwindigkeit be evaluated as a measure of the physical profile of the road surface. The method using a sensor provided in the antilock brake control (ABS) of the vehicle provides information about the physical profile of the road surface, which can be used in real time for cruise control, suspension adaptation or for forecasting in a navigation device.
Aufgabe der Erfindung ist es, die Sicherheit, die Zuverlässigkeit und den Komfort eines Rückhaltegurtsystems mit einem reversiblen Gurtstraffer zu verbessern. Diese Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst.The object of the invention is to improve the safety, reliability and comfort of a restraint belt system with a reversible belt tensioner. This object is solved by the features of claim 1.
Wird ein reversibler Gurtstraffer in einem Kraftfahrzeug infolge einer erfassten Gefahrensituation ausgelöst, so wird ein Rückhaltegurt eines Gurtsystems gestrafft. Das Gurtsystem umfasst eine von einem Beschleunigungssensor aktivierbare Gurtauszugssperre, welche im aktivierten Zustand bewirkt, dass der Rückhaltegurt nicht von einer Gurtspule abgewickelt werden kann. Nachdem das Ende einer Gefahrensituation ermittelt wurde, wird der Gurtstraffer mit einem Lösesignal angesteuert, um das freie Abwickeln des Gurtbandes zu ermöglichen und Lösen der Gurtauszugssperre zu bewirken. Erfindungsgemäß wird in einer Schlechtwegerkennung mittels Sensoren erkannt, ob das Fahrzeug sich auf einer Schlechtwegstrecke bewegt. Das Lösesignal kann erst gesetzt werden, wenn mittels der Schlechtwegerkennung ausgeschlossen werden kann, dass sich das Fahrzeug auf einer Schlechtwegstrecke bewegt . Oder anders ausgedrückt : Es kann ein Lösesignal nur gesetzt werden, wenn keine Schlechtwegstrecke vorliegt. Die Erkenntnis, dass sich das Fahrzeug momentan auf einer Schlechtwegstrecke bewegt, führt also dazu, dass das Lösesignal ausgesetzt und zeitversetzt erst dann an den Gurtstraffer gegeben wird, wenn die Schlechtwegfahrt zu Ende ist. Damit wird sichergestellt, dass ein Löseversuch nicht an der Blockierung der Gurtauszugssperre scheitert, wenn das Fahrzeug gerade eine Schlechtwegfahrt durchführt .If a reversible belt tensioner in a motor vehicle is triggered as a result of a detected dangerous situation, then a restraint belt of a belt system is tightened. The belt system comprises a belt pull-out lock which can be activated by an acceleration sensor and which, when activated, causes the restraining belt to be unwound from a belt reel. After the end of a dangerous situation has been determined, the belt tensioner is driven with a release signal to allow the free unwinding of the webbing and to bring about release of the Gurtauszugssperre. According to the invention, it is detected in a poor road recognition by means of sensors whether the vehicle is moving on a poor road. The release signal can only be set if it can be ruled out by means of the bad path recognition that the vehicle is moving on a poor road. In other words, a release signal can only be set if there is no bad path. The finding that the vehicle is currently moving on a poor road, so leads to the fact that the release signal is suspended and given time-delayed to the belt tensioner when the Schlechtwegfahrt is over. This ensures that a loosening attempt does not fail to block the belt pullout when the vehicle is just making a Schlechtwegfahrt.
Eine Schlechtwegfahrt kann durch unterschiedliche Auswertungen von Sensorsignalen z.B. im ESP-Steuergerät erkannt werden. Beispielsweise geben erhöhte Rauschpegel in den Signalen der Sensoren für Raddrehzahlen, Längs- und Querbeschleunigung oder Giergeschwindigkeit Hinweise auf den Fahrbahnuntergrund. Verfahren zur Bestimmung der Rauheit des Fahrahnuntergrundes sind aus dem Stand der Technik wohlbekannt .Bad travel can be achieved by different evaluations of sensor signals, e.g. detected in the ESP control unit. For example, increased levels of noise in the signals from the sensors for wheel speeds, longitudinal and lateral acceleration or yaw rate give indications of the road surface. Methods for determining the roughness of the driving surface are well known in the art.
Eine Schlechtwegstrecke kann auch durch Auswertung der Signale von Sensoren für die Vertikalbeschleunigung des Fahrzeugaufbaus oder von Federwegsensoren erkannt werden, welche Anregungen aus der Straßenoberfläche enthalten. Auswerteverfahren als solche sind aus dem Stand der Technik wohlbekannt. Die Sensoren werden typischerweise für Komfortanwendung wie aktiver Dämpferregelung oder Fahrzeugaufbauregelung (Active Body Control, ABC) eingesetzt. Aufgrund der Vernetzung aller Sensorsignale mittels eines Informations-Bus-Systems können auch diese Sensorsignale herangezogen werden, um auf die Fahrbahnbeschaffenheit zu schließen. Es ist besonders von Vorteil die verschiedenen, verfügbaren Sensorsignale parallel auszuwerten und zur gegenseitigen Plausibilisierung heranzuziehen.A poor road can also be evaluated by evaluating the signals from vertical acceleration sensors Vehicle structure or spring travel sensors are detected, which contain suggestions from the road surface. As such, evaluation methods are well known in the art. The sensors are typically used for comfort applications such as active damper control or Active Body Control (ABC). Due to the networking of all sensor signals by means of an information bus system, these sensor signals can also be used to conclude on the road condition. It is particularly advantageous to evaluate the different, available sensor signals in parallel and to use them for mutual plausibility.
Durch Erkennen der Schlechtwegstrecke, wird auch verhindert, dass ein Insassen, nach einer vorbeugenden Auslösung des reversiblen Gurtstraffers, durch einen vergeblichen Löseversuch auf einer Schlechtwegstrecke noch stärker durch das Gurtband an den Sitz gefesselt wird, wenn der Lösemodus des Gurtstraffers darin besteht, die Gurtspule um einen bestimmten Drehwinkel in Aufwickelrichtung zu drehen. Mit der Einbeziehung der Schlechtweg-Erkennung wird verhindert, dass ein Insasse auf einer Schlechtwegstrecke sich aufgrund der Fesselung durch den Gurt abschnallt, um eine Gurtfreigängigkeit zu erreichen. Mit der Erfindung werden vorbeugende Auslösungen von Gurtstraffern auch bei Geländefahrt störungsfrei, sicher und komfortabel durchführbar .By recognizing the poor road, it is also prevented that an occupant, after a preventive release of the reversible belt tensioner is tied by a futile attempt at loosening on a poor road even more through the webbing to the seat when the release mode of the belt tensioner is in the belt reel to rotate a certain angle of rotation in the winding direction. The inclusion of the bad-path detection prevents an occupant on a rough road from being unbuckled due to the tethering by the belt in order to achieve belt release. With the invention, preventative triggering of belt tensioners even in off-road driving trouble-free, safe and comfortable to carry out.
Die einzige Figur zeigt ein Ablaufdiagramm einer vorteilhaften Ausführungsform eines Verfahrens zur Ansteuerung eines reversiblen Gurtstraffers . Das Verfahren beschreibt die Ansteuerung des Gurtstraffers mit einem Lösesignal, um das Gurtband wieder in einen Komfortzustand zu überführen, nachdem mit Auslösung des Gurtstraffers die auf das Gurtband wirkende Blockiervorrichtung dieThe single FIGURE shows a flowchart of an advantageous embodiment of a method for controlling a reversible belt tensioner. The method describes the control of the belt tensioner with a release signal to bring the belt back into a comfort state, after triggering the belt tensioner on the webbing acting blocking device the
Gurtauszugssperre aktiviert hat (Blockierzustand) . Die voraus liegenden Verfahrensschritte, welche zur Auslösung des Gurtstraffers geführt haben, werden daher nicht dargestellt.Belt pullout lock has activated (blocking state). The process steps which have preceded which have led to the release of the belt tensioner are therefore not shown.
Die Ansteuerung erfolgt in einem Lösezeitpunkt, welcher zunächst unter Heranziehen von Fahrzuständen,The control takes place in a release time, which initially using driving conditions,
Fahreraktivitäten und Umfelddaten ermittelt wird. Alternativ oder ergänzend können auch andere Größen zur Ermittlung des Lösezeitpunkts herangezogen werden.Driver activities and environmental data is determined. Alternatively or additionally, other variables can also be used to determine the release time.
In Schritt 1 werden Fahrzustandsdaten wie Raddrehzahlen, Längs- und Querbeschleunigung, Drehbeschleunigung, Giergeschwindigkeit, Gierbeschleunigung des Fahrzeugs erfasst oder ermittelt. In Schritt 2 werden die Fahrzustandsdaten mit Schwellwert verglichen und bei Unterschreitung der Schwellwerte auf eine Beendigung der Gefahrensituation geschlossen.In step 1, driving condition data such as wheel speeds, longitudinal and lateral acceleration, spin, yaw rate, yaw acceleration of the vehicle are detected or detected. In step 2, the driving state data are compared with the threshold value and, when the thresholds are not reached, they are concluded that the dangerous situation has ended.
In Schritt 3 werden Daten über die Fahreraktivitäten erfasst oder ermittelt, wie z.B. Bremspedalbetätigung, Gaspedalbetätigung, Lenkwinkeleinschlag, Wachheitszustand, Belastung und Ähnliches. Diese Daten werden zur Weiterverarbeitung in Schritt 4 mit Schwellwerten verglichen und bei Unterschreitung der Schwellwerte auf eine Beendigung der Gefahrensituation geschlossen.In step 3, data about the driver's activities is detected or determined, e.g. Brake pedal operation, accelerator operation, steering angle, alertness, load and the like. These data are compared with thresholds for further processing in step 4 and closed when the thresholds are below a risk situation.
In Schritt 5 werden Umfelddaten einer Umfeldsensorik, wie z.B. Radar, Infrarot-Abstandsmessung, Bild gebende Verfahren oder Nahbereichskommunikation, erfasst und hinsichtlich einer kritischen Annäherung an ein Kollisionsobjekt ausgewertet. In Schritt 6 wird abgefragt, ob die Umfelddaten auf eine Beendigung der Gefahrensituation schließen lassen. Die Ergebnisse der Abfragen in den Schritten 2, 4 und 6 werden in Schritt 7 zusammengeführt. Es wird ein Zeitpunkt ermittelt, zu dem die überwachten Größen unter den jeweils vorgebbaren Schwellwerten liegen oder alle Daten auf eine Beendigung der Gefahrensituation schließen lassen.In step 5, environmental data of an environmental sensor system, such as radar, infrared distance measurement, imaging or short-range communication, are detected and evaluated with respect to a critical approach to a collision object. In step 6, a query is made as to whether the environmental data indicate that the dangerous situation has ended. The results of the queries in steps 2, 4 and 6 are merged in step 7. A point in time is determined at which the monitored variables are below the respectively predefinable threshold values or if all data are indicative of termination of the dangerous situation.
Als ein Lösezeitpunkt kann basierend auf den in den Schritten 1, 3 und 5 ermittelten oder erfassten Größen sowohl der aktuelle Zeitpunkt, als auch ein in der Zukunft liegender Zeitpunkt ermittelt werden, z.B. unter Einbeziehung eines mathematischen Modells für den Beschleunigungssensor der Blockiervorrichtung, wie dies in der EP1644226A1 offenbart ist.As a solving time, based on the quantities detected or detected in steps 1, 3 and 5, both the current time and a future time may be determined, e.g. including a mathematical model for the acceleration sensor of the blocking device, as disclosed in EP1644226A1.
In Schritt 8 werden weitere Kriterien abgefragt, welche zum Lösen einer Gurtauszugssperre erfüllt sein müssen. Erfindungsgemäß wird das Ergebnis einer Schlechtwegerkennung 9 abgefragt, welche mittels Sensoren ermittelt, ob das Fahrzeug sich auf einer Schlechtwegstrecke bewegt. Insbesondere werden solche Sensoren eingesetzt, wie sie auch zur Aufnahme der Fahrzustandsdaten in Schritt 1 verwendet werden. Hinsichtlich der Ausführung wird beispielhaft auf die eingangs genannte DE 195 37 257 Al verwiesen.In step 8 further criteria are queried, which must be met to release a belt pullout. According to the invention, the result of a bad road recognition 9 is queried, which determines by means of sensors, whether the vehicle is moving on a poor road. In particular, such sensors are used as they are also used to record the driving condition data in step 1. With regard to the embodiment, reference is made, by way of example, to the aforementioned DE 195 37 257 A1.
Wenn die Schlechtwegerkennung eine Schlechtwegstrecke anzeigt, wird kein Lösesignal weiter gegeben. Erst wenn keine Schlechtwegstrecke angezeigt wird, kann ein Lösesignal weiter gegeben werden und in Schritt 10 der reversible Gurtstraffer angesteuert werden, um die Gurtauszugssperre zu lösen und somit das Gurtsystem vom Blockierzustand in den Komfortzustand zu versetzen. Bei dem eingangs genannten Stand der Technik weist der Gurtstraffer einen auf die Gurtspule wirkenden elektromotorischen Antrieb auf, welcher bei Ansteuerung mit dem Lösesignal die Gurtspule soweit in Aufwickelrichtung dreht, dass in der Blockiervorrichtung sich die Verzahnung einer Sperrklinke von einer komplementären, mit der Gurtspule mitdrehenden Verzahnung lösen kann, womit die Gurtauszugssperre gelöst wird. Hinsichtlich dieser Ausführung wird beispielhaft auf die eingangs genannte EP1339575 Bl verwiesen.If the bad path detection indicates a bad route, no release signal will be passed on. Only if no poor road is displayed, a release signal can be given and in step 10 of the reversible belt tensioner are controlled to release the belt pullout and thus to put the belt system from the blocking state in the comfort state. In the aforementioned prior art, the belt tensioner on an acting on the belt reel electromotive drive, which when activated with the release signal, the belt spool as far as Winding rotates that in the blocking device, the teeth of a pawl of a complementary, with the belt spool mitdrehenden teeth can be solved, whereby the Gurtauszugssperre is released. With regard to this embodiment, reference is made by way of example to the aforementioned EP1339575 Bl.
In einer alternativen Ausgestaltung kann die in Schritt 8 durchgeführte Abfrage auch zu einem anderen Zeitpunkt, beispielsweise bereits vor Schritt 1 erfolgen. In an alternative embodiment, the query carried out in step 8 can also take place at another time, for example, before step 1.

Claims

Patentansprüche claims
1. Verfahren zur Ansteuerung eines reversiblen1. Method for controlling a reversible
Gurtstraffers (10) eines Sicherheitsgurtes in einem Kraftfahrzeug,Belt tensioner (10) of a safety belt in a motor vehicle,
- wobei ein Auslösen des Gurtstraffers (10) ein Straffen eines sich um eine Gurtspule abwickelnden Gurtbandes eines Sicherheitsgurts bewirkt,- wherein a triggering of the belt tensioner (10) causes a tightening of a belt reel developing a belt of a seat belt,
- wobei der Sicherheitsgurt als Gurtauszugssperre eine auf die Gurtspule in Abwickelrichtung wirkende Blockiervorrichtung aufweist, welche bei Auftreten einer Fahrzeug-Beschleunigung oberhalb einer Blockierschwelle sperrend reagiert,- wherein the seat belt as Gurtauszugssperre has a acting on the belt reel in the unwinding blocking device which reacts blocking when a vehicle acceleration above a blocking threshold,
- wobei nach einem durch eine Gefahrensituation bedingten Auslösen des Gurtstraffers (10) und bei Vorliegen eines vorgegebenen Betriebszustands (7) , welcher indikativ für eine Beendigung der Gefahrensituation ist, der Gurtstraffer (10) mit einem Lösesignal angesteuert wird, um das Lösen der Gurtauszugssperre von einem Blockierzustand in einen Komfortzustand zu bewirken, dadurch gekennzeichnet, dass in einer Schlechtwegerkennung (9) mittels Sensoren erkannt wird, ob das Fahrzeug sich auf einer Schlechtwegstrecke bewegt und kein Lösesignal gesetzt wird, solange eine Schlechtwegerkennung eine Schlechtwegstrecke erkennt.- After a conditional by a dangerous situation triggering the belt tensioner (10) and in the presence of a predetermined operating condition (7), which is indicative of a termination of the danger situation, the belt tensioner (10) is driven with a release signal to the release of the belt pullout of To effect a blocking state in a comfort state, characterized in that in a bad road recognition (9) is detected by means of sensors, whether the vehicle is moving on a poor road and set no release signal is, as long as a bad path detection detects a bad road.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass ein Lösesignal dann gesetzt werden kann, wenn keine Schlechtwegstrecke erkannt wird .2. The method according to claim 1, characterized in that a release signal can then be set if no Badwegstrecke is detected.
3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Gurtstraffer einen auf die Gurtspule wirkenden Antrieb aufweist, welcher bei Ansteuerung mit dem Lösesignal, die Gurtspule soweit in Aufwickelrichtung dreht, dass die Blockiervorrichtung der Gurtspule gelöst werden kann.3. The method according to claim 1, characterized in that the belt tensioner has a force acting on the belt reel drive, which rotates when actuated with the release signal, the belt reel as far in the winding that the blocking device of the belt reel can be solved.
4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass eine Schlechtwegstrecke durch Auswertung der Signale von Sensoren (1) für Raddrehzahlen, Längs- und Querbeschleunigung oder Giergeschwindigkeit erkannt wird (9) .4. The method according to claim 1, characterized in that a bad path is detected by evaluation of the signals from sensors (1) for wheel speeds, longitudinal and lateral acceleration or yaw rate (9).
5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass eine Schlechtwegstrecke durch Auswertung der Signale eines Sensors für die Vertikalbeschleunigung des Fahrzeugaufbaus erkannt wird (9) .5. The method according to claim 1, characterized in that a bad path is detected by evaluation of the signals of a sensor for the vertical acceleration of the vehicle body (9).
6. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass eine Schlechtwegstrecke durch Auswertung der Signale von Federwegsensoren erkannt wird (9) . 6. The method according to claim 1, characterized in that a bad path is detected by evaluation of the signals from spring travel sensors (9).
PCT/EP2007/006928 2006-11-03 2007-08-06 Method for triggering a reversible belt tensioner of a safety belt in a motor vehicle WO2008052608A1 (en)

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