DE4042721C2 - Process for triggering occupant protection devices - Google Patents

Process for triggering occupant protection devices

Info

Publication number
DE4042721C2
DE4042721C2 DE4042721A DE4042721A DE4042721C2 DE 4042721 C2 DE4042721 C2 DE 4042721C2 DE 4042721 A DE4042721 A DE 4042721A DE 4042721 A DE4042721 A DE 4042721A DE 4042721 C2 DE4042721 C2 DE 4042721C2
Authority
DE
Germany
Prior art keywords
occupant
position
occupant protection
triggering
protection device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
DE4042721A
Other languages
German (de)
Inventor
Hans Spies
Alfons Woehrl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Conti Temic Microelectronic GmbH
Original Assignee
Conti Temic Microelectronic GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Conti Temic Microelectronic GmbH filed Critical Conti Temic Microelectronic GmbH
Priority to DE19904023109 priority Critical patent/DE4023109A1/en
Application granted granted Critical
Publication of DE4042721C2 publication Critical patent/DE4042721C2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015Electrical 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 the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B60R21/01512Passenger detection systems
    • B60R21/01542Passenger detection systems detecting passenger motion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015Electrical 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 the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B60R21/01512Passenger detection systems

Abstract

A method for triggering occupant protection devices, in particular in motor vehicles, is presented, the seating position of the occupant being sensed and the times and the extent of the protective measures to be initiated being derived therefrom. The position of the occupant or a part of the body is additionally detected by the occupant, in particular the head, in the direction perpendicular to the longitudinal axis of the vehicle.

Description

The invention relates to a method for triggering occupant protection devices Occupant protection system for vehicles, in particular a restraint system for People who take a seat on adjustable vehicle seats in the vehicle, taking one Acceleration and / or a motion sensor (or more) part of a Trigger circuit for the restraint system and wherein a device is provided who senses in what position the person or part of him is relative to Protection device is located.

A similar, very simple monitoring device is e.g. B. in German Laid-open specification 38 02 159. The switching device described there asks depending on whether the activation of the gas cushion should be released depending on the seating position. Of course, it is necessary to determine beforehand by means of a seat contact whether the Vehicle seat is occupied or occupied at all. A control system records the sitting position z. B. after seat adjustment and inclination of the backrest depending on the Switches or a position memory. A microcomputer circuit with Program initialization helps compare.

According to the inventors, it is helpful to have a control system to determine a Sitting position to use, however, are important insights from accident research disregarded. These indicate that the most dangerous types of breast injuries and head injuries.

To reduce these injuries or to exclude them if possible, one has Restraint systems with gas cushions were invented for both driver and passenger inflate between the steering wheel and driver or dashboard and front passenger.

In addition, DE-OS 22 49 988, DE 34 22 263 A1 and DE 37 41 637 A1 already being from the door or from the vehicle ceiling diagonally from the front to the head and the Headrest provided for inflatable airbags.

There are also restraint systems with belt tensioners for tightening the person in one certain position on the seat.

The object of the present invention is to provide a method in which the Protective effect, especially with regard to particularly dangerous breast and Head injuries is improved.

This object is achieved by a method according to claim 1.

Training and developments of the invention are the further claims.

It is from the door and / or from the vehicle ceiling diagonally upside down and the headrest provided inflatable airbags.

The position of the occupant or a body part of the occupant, in particular of the head, in relation to the associated occupant protection devices and the times and scope of the protective measures to be initiated are derived from this.

In contrast to the prior art, the position measurement of the body parts takes place relatively to fixed structural parts of the vehicle or to the censoring device not only in one Direction, but from several directions and advantageously with several Sensors for one protection system or for several protection systems, whereby one Selectivity is guaranteed. The invention makes it possible, depending on the detected Position values and / or changes in movement depending on speed or Acceleration and / or direction (vector) the evaluation in a computerized System, especially with the help of an on-board computer, more intelligently to process and to recycle than is possible in the prior art, where the switching device only as Inhibit can act to prevent activation of the restraint system if none optimal position of the seat is present.

In addition, the occupant protection of important parts of the body, especially the head, improved by evaluating the direction and speed of a movement and a suitable protective measure is triggered. It is taken into account which Position the body part (s) just before or at the beginning of an accident.

Exemplary embodiments of the invention are shown in the drawings.

Show it:

Fig. 1 shows a longitudinal section through a vehicle chassis with a passenger compartment with a driver in a particular seat position,

Fig. 2 shows a similar view in relation to a passenger,

Fig occupied. 3 is a cross-sectional view of a passenger compartment with, for example four,

Fig. 4 shows a modification to Fig. 3,

Fig. 5 shows a further modification to Fig. 3 and

Fig. 6 shows a particular embodiment to FIG. 2.

As shown in FIG. 1, a person 2 sits in a passenger compartment 1 of a vehicle on a seat 3 which is attached to a frame 5 on the floor 4 of the compartment. The roof of the cell is designated by 6 and a glass pane, in particular a front pane, by 7. The dashboard is designated by 8 , in which a gas cushion 9 which is inflatable by a gas generator is located as one of the restraint systems. An on-board computer 10 with a display 11 is located in the area of the dashboard. The on-board computer is equipped with central computers and memories and contains the necessary software. It is also connected to the individual sensors, as will be explained later. The gas generator is in turn connected to a detonator trigger circuit known per se, which triggers the gas cushion 9 only in certain cases.

A circuit, depending on predetermined threshold values, for triggering a safety device is e.g. B. described in German Patent 24 54 424. This ensures that the safety device is only triggered in the event of a collision of the motor vehicle, if a deceleration of the vehicle which is significantly above the normal driver vibrations occurs, detected by at least one acceleration sensor as a sensor. This sensor can at one or more points, e.g. B. in the front of the vehicle (not shown). This sensor 13 is connected to the circuit 11 for signal processing and evaluation and the latter again via the bus 14 to the central computer on board 10 , which in turn works with memories and links, so that measured values from other measuring devices are used for the evaluation and are optimal Adaptation to the severity of the accident can take place in such a way that actuators of the type and number and mode of action (graded) are controlled as necessary and conducive to the desired improvement in occupant protection.

A belt system 12 , in particular with three-point belts and as a restraint system, is provided as the second occupant protection system in addition to the gas bag 9 . These belts can be activated, in particular by means of rear tensioners for the seat belts. Other and further restraint systems are also applicable, in particular from the door inflatable gas cushion or the vehicle ceiling 6 obliquely from the front of the head and the headrest of the seat to be movable gas cushion. Furthermore, self-winding and tightening belt systems when getting in, also from the side swiveling in or swiveling in from above or holding devices or transversely movable (transverse to the direction of travel) in connection with posts, roll bars etc. applicable.

In Fig. 1, two distance or position measuring devices that emit and receive beams are designated 15 and 16 and assigned to the dashboard and / or the sun visor or the rear view mirror at the front of the front screen 7 . In this way, above all the head, if desired also another body part, can be sensed in its respective (sitting) position according to the principle of the transit time measurement - as is known per se - with the sensors 15 'and 16 ' assigned to the measuring beams 15 , 16 , which in turn are connected to the on-board computer device 10 . The (sitting) position of the occupant or of a particular body part of the same is quasi permanently sensed in special relation to the devices mentioned. One or preferably several sensors ( 15 'to 18 '), such as light or sound propagation time sensors, can carry out an optically geometrical diversity distance measurement in one, two or three axes or more. Furthermore, the occupancy of the seat is sensed in a known manner by a seat contact 19 and the distance sensing of the body part or parts, as described above, is switched in AND connection with the seat and / or a backrest contact of the seat.

With the help of the (on-board) computer 10 , one or more occupant protection devices are triggered (or inhibited) independently of a respective other occupant protection device when a certain accident situation is detected, e.g. B. by evaluating signals from several acceleration sensors to z. B. to recognize the direction of an impact.

If the occupant has changed position relative to the home seating position, the best possible protection is only achieved under certain conditions. For this it would be desirable if the person is as close as possible to the seat contour, such as the seat and / or backrest surfaces, and if the head is leaned against a headrest and / or neck support. Especially for this purpose, further additional sensors are arranged on the inside of the roof surface 6 of the passenger compartment 1 , apart from on the sun visor and / or rear-view mirror. These sensors are designated 17 and easily detect any head movement according to one of the measuring principles mentioned. Obviously, these sensors are also suitable for protecting the passenger according to FIG. 2. In this case can of FIG. 1 and FIG. 6, the sensors 15 'in the steering wheel 21 can be arranged which z. B. capture the distance between the steering wheel 21 and the front of the head while z. B. the sensor 16 'detects the distance between the windshield and the head. A head movement or head acceleration is easily detectable by size and direction due to the different measuring beams. In Fig. 1 and Fig. 6, the gas generator, its trigger sensor (acceleration sensor) and the trigger circuit for the gas generator of the gas cushion in the steering wheel or its cavity and / or steering column is housed. FIGS. 3, 4 and 5 show further sensors 18 '.

All of the sensors described are in turn connected to the central on-board computer 10 , e.g. B. electr. and / or via data bus and for evaluation in this central computer or coprocessor (s) are compared with values from stored (sample) processes and linked in such a way that the triggering and the time at which the occupant protection device is triggered is derived from:

  • a) the occupant's (seated) position for maximum protection of the protective device,
  • b) the distance of the occupant in relation to the measuring device (sensor),
  • c) the position change speed or acceleration / deceleration of the Occupants in relation to the measuring and / or occupant protection device, d. H. the change is derived from the occupant position at certain times or in a certain Time window.

Unlike in Fig. 1 and Fig. 2 for the front passenger and driver, a plurality of sensors 18 'for each occupant may be provided (Fig. 3) or per passenger per one sensor (Fig. 4), for example. B. there in the neck support 20th

In FIG. 5, a particular embodiment is still visible, per occupant two sensors is associated with the neck support in which 20 of the respective seat. This allows a selectivity of the method for triggering occupant protection devices by extension with a plausibility check in the on-board computer, the occupant displacement speed derived from the sensed relative occupant position or its change per unit of time (acceleration / deceleration) being compared with the vehicle deceleration measured with an accelerometer and / or one speed reduction determined therefrom, and that the amount, if applicable, with the associated direction (vector) and the ratio per unit of time is within a predetermined range. Only then is the occupant protection device triggered.

The selectivity of the method for triggering Occupant protection devices can also be extended with the Plausibility check in the on-board computer are increased such that the Locking or trigger signal of the quasi permanent measuring Position measuring device with the trigger signal of a known Impact sensor with at least one accelerometer and / or quasi-and-linked at least one spring-mass system for evaluation and actuation of actuators for the purpose of adapted activation of a multiple occupant protection devices depending on the type of impact and the previous position the occupant has taken in the vehicle or occupies within a certain time window.

In a special embodiment of the invention it is provided that Display drivers or occupants from the on-board computer, e.g. B. by levy a warning signal if it is too far from the optimal position Protection position removed that an activation of a Occupant protection device must be inhibited.

The invention is particularly economical since it applies to all Occupant seats and their occupation / occupancy as a prerequisite for one Distance or distance measurement responds, because if not used not only inhibit activation of a protective device, but rather the measurement, signal processing and evaluation and thus occupancy of the on-board computer.

For the optimal development of protective effects of one or more Protective devices are also part of the invention And-protection enhancing effect if the sensation for this recognized beneficial or necessary, e.g. B. Belt tightening plus Gas cushion inflation or an inhibition of one or two Systems when e.g. B. one of these systems has no protective reinforcement as a whole or for particularly sensitive parts of the body, such as B. the Head, would bring.

Claims (8)

1. method for triggering occupant protection devices in motor vehicles,
  • a) wherein gas cushions are provided from the door and / or from the vehicle ceiling obliquely from the front onto the head and the headrest and
  • b) the position of the occupant ( 2 ) or a body part of the occupant, in particular the head, in relation to these occupant protection devices ( 18 ') and
  • c) the times and scope of the protective measures to be initiated are derived from this.
2. The method according to claim 1, characterized in that the occupant position is sensed by the occupant position sensor (s) in And linkage with a seat and / or a backrest contact.
3. The method according to any one of the preceding claims, characterized in that triggering each occupant protection device independently of the others Occupant protection devices take place when a certain crash situation is detected, and the occupant's position relative to the associated occupant protection device within sensed time intervals has only changed so far that the Occupant protection device that performs its maximum possible protective effect.
4. The method according to any one of the preceding claims, characterized in that the triggering and the time of triggering the occupant protection device is derived from
  • a) the occupant target (seat) position for maximum protective effect of the occupant protection device,
  • b) the distance of the occupant in relation to the measuring device at a certain time and
  • c) the position change speed of the occupant in relation to the measuring and / or occupant protection device (derived from the occupant position = f (time)).
5. The method according to any one of the preceding claims, characterized in that the occupant in question is warned if he has a (seated) position in the motor vehicle occupies the possibility of maximum protection of occupant protection device affects the occupant and the warning signal ends when the Occupant has corrected his position accordingly.  
6. The method according to any one of the preceding claims, characterized in that the selectivity of the method for triggering occupant protection devices Expansion by a plausibility test facility is increased such that the sensed relative occupant position derived occupant displacement speed and / or its change per unit of time is compared with that of an accelerometer measured vehicle deceleration and / or speed reduction determined therefrom and that the measured amount, if applicable with associated direction (vector), as well as the ratio per unit of time in one predetermined bandwidth has to lie, thus triggering the occupant protection device is done.  
7. The method according to any one of the preceding claims, characterized in that The target seating position of all occupants is stored in a (on-board) computer.
8. The method according to any one of the preceding claims, characterized in that the position of the occupant using two or more electronic Image acquisition elements are captured and the position is derived from them.
DE4042721A 1990-07-20 1990-07-20 Process for triggering occupant protection devices Expired - Lifetime DE4042721C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19904023109 DE4023109A1 (en) 1990-07-20 1990-07-20 Releasing motor vehicle occupant protection appts. - sensing body positions w.r.t. to safety device e.g. inflatable cushion for more effective operation esp. for head and chest

Publications (1)

Publication Number Publication Date
DE4042721C2 true DE4042721C2 (en) 2002-11-21

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ID=6410684

Family Applications (4)

Application Number Title Priority Date Filing Date
DE4042722A Expired - Lifetime DE4042722C2 (en) 1990-07-20 1990-07-20 Procedure for triggering occupant protection devices
DE4042723A Expired - Fee Related DE4042723C2 (en) 1990-07-20 1990-07-20 Method for generating a warning signal in a motor vehicle with occupant protection devices
DE4042721A Expired - Lifetime DE4042721C2 (en) 1990-07-20 1990-07-20 Process for triggering occupant protection devices
DE19904023109 Ceased DE4023109A1 (en) 1990-07-20 1990-07-20 Releasing motor vehicle occupant protection appts. - sensing body positions w.r.t. to safety device e.g. inflatable cushion for more effective operation esp. for head and chest

Family Applications Before (2)

Application Number Title Priority Date Filing Date
DE4042722A Expired - Lifetime DE4042722C2 (en) 1990-07-20 1990-07-20 Procedure for triggering occupant protection devices
DE4042723A Expired - Fee Related DE4042723C2 (en) 1990-07-20 1990-07-20 Method for generating a warning signal in a motor vehicle with occupant protection devices

Family Applications After (1)

Application Number Title Priority Date Filing Date
DE19904023109 Ceased DE4023109A1 (en) 1990-07-20 1990-07-20 Releasing motor vehicle occupant protection appts. - sensing body positions w.r.t. to safety device e.g. inflatable cushion for more effective operation esp. for head and chest

Country Status (1)

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DE (4) DE4042722C2 (en)

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