CN112172724A - Method for detonating an airbag - Google Patents
Method for detonating an airbag Download PDFInfo
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- CN112172724A CN112172724A CN201910585087.6A CN201910585087A CN112172724A CN 112172724 A CN112172724 A CN 112172724A CN 201910585087 A CN201910585087 A CN 201910585087A CN 112172724 A CN112172724 A CN 112172724A
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- airbag
- lateral
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- lateral acceleration
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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
-
- 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
- B60R21/0136—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 actual contact with an obstacle, e.g. to vehicle deformation, bumper displacement or bumper velocity relative to the vehicle
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air Bags (AREA)
Abstract
The invention relates to a method for detonating an airbag (10), in particular a side airbag and/or an airbag curtain, of a vehicle, comprising the following steps: detecting yaw rate, steering wheel angle, longitudinal acceleration and lateral acceleration of the vehicle by means of sensors; calculating the transverse speed information of the vehicle by means of an electronic control unit (2) of the airbag from the detected yaw rate, steering wheel angle, longitudinal acceleration and lateral acceleration; if the transverse speed information meets the set conditions, reducing the ignition threshold of the safety air bag; detonating an airbag (4) of the airbag (10) according to a reduced ignition threshold value based on the lateral acceleration by the electronic controller (2).
Description
Technical Field
The invention relates to a method for detonating an airbag, in particular a side airbag and/or a side curtain.
Background
As is well known, an airbag is an important safety configuration for a vehicle, and the airbag automatically opens to protect the safety of passengers in the vehicle when a collision accident occurs during the driving of the vehicle. The safety air bag mainly comprises a sensor, an electronic controller (or a microprocessor), an air generator, an air bag and the like. In the event of a collision, the sensor first receives an impact signal and, as soon as a predetermined intensity is reached, the sensor activates and sends a signal to the electronic control unit. The electronic controller receives the signal and compares it to its stored ignition threshold, and if an airbag deployment condition is reached, a drive circuit sends a deactivation signal to the gas generator. The gas generator receives the signal and then ignites the gas generating agent to generate a large amount of gas to inflate the airbag, so that the airbag can be rapidly unfolded in a very short time, namely the airbag is detonated. The electronic controller collects and processes data, diagnoses the reliability of the safety airbag, ensures that an ignition signal is sent out in time when a preset numerical value is reached, ignites at a right time, and ensures that a large enough driving current drives the gas generator.
There are many places in a vehicle where airbags are provided, such as a front airbag (preferably one each of a driver's seat and a passenger's seat) installed in front of a front seat of the vehicle, side airbags installed outside the front seat and a rear seat, a side curtain (which is also called a curtain airbag or a head airbag) installed above a side window, and the like. The front airbag is mainly used for relieving secondary collision between a driver and a steering wheel during front collision and secondary collision between a passenger in a front passenger seat and an instrument panel and a front windshield glass frame. The side airbag is mainly used for reducing the impact of the body and the door panel. The side curtain shields the head of the occupant primarily during a side impact, and it pops out of the cover window during the impact to isolate the occupant from the B-pillar, window glass, and even the seat belt side support buckle.
In the event of a moderate to severe frontal impact, the sensor will sense that the vehicle is decelerating sharply, i.e. has a greater longitudinal deceleration, and the electronic controller will immediately cause the frontal air bag to detonate forcefully in a burst to cushion the vehicle from injury due to a frontal impact. And when the vehicle is in a side collision, the electronic controller determines when the side air bag and/or the side air curtain detonates through an internal algorithm according to the lateral acceleration information of the sensor. When the ignition requirement is met, the side air bag and/or the air curtain detonate, and the injury caused by side impact is reduced.
But not all crash situations in which the airbag is deployed. The safety air bag judges whether the air bag pops up or not through a pressure sensor of an air bag system and an acceleration sensor in an Electronic Control Unit (ECU) of a restraint system, and when the pressure sensor and the acceleration sensor receive signals together, the air bag is inflated instantly. If the ignition requirement is not met, the safety airbag cannot detonate. Such an example is common in the case of a side pillar crash.
When a vehicle loses control, for example, due to a driver speeding, a curve misjudgment, or in a wet skid situation, due to a skid or the like, it collides against a rigid object such as a roadside trunk, a pillar (e.g., a signal traffic sign post, a light pole, a telephone pole, a telecom pole, a fire hydrant, a utility pole), or the like, a side pillar collision occurs. The side pillar collision configuration is more complex than a typical side collision, and includes not only lateral translational movement of the vehicle, but also rotational movement about the collision interface and its own center of gravity. The rotation of the vehicle body about its center of gravity causes a deflection phenomenon in the collision path, and thus a side pillar collision is more harmful to the occupant than a general side collision. However, in such a side pillar crash, the lateral acceleration signal is weak due to the small pillar contact area, and therefore, a late firing is often caused, i.e., the occupant is already injured by the crash before the side airbag and/or side curtain is fired. In view of this, current methods of determining whether a side airbag and/or a side curtain detonates based solely on a lateral acceleration signal do not meet the customer's ignition requirements.
In addition, subtle differences in impact angle and velocity during each side pillar impact can result in large changes in impact path, and thus lateral acceleration signals are also less reproducible than other types of signals. Therefore, the above-described method of side airbag and/or side curtain ignition based on a lateral acceleration signal does not easily verify the safety and plausibility, i.e., instability, of the ignition threshold set for it.
Disclosure of Invention
It is therefore an object of the present invention to provide a method for detonating an airbag, in particular a side airbag and/or a side curtain, which improves the ignition behavior of the airbag detonation, ensures that the airbag can function effectively even in the event of a side pillar collision, and improves occupant safety.
The object is achieved by a method of the type mentioned at the beginning, which comprises the following steps. First, the yaw rate, the steering wheel angle, the longitudinal acceleration, and the lateral acceleration of the vehicle are detected by means of sensors. The yaw angle of the vehicle is the included angle between the longitudinal axis of the vehicle and the motion direction of the mass center at a certain moment. Yaw rate, also known as yaw rate, indicates the rate of vehicle yaw about the vertical axis. The magnitude of this deflection represents the degree of stability of the vehicle. If the angular velocity of the deflection reaches a threshold value, dangerous working conditions such as skidding measurement or tail flicking of the automobile are indicated. Lateral acceleration is normal (i.e. perpendicular to the speed) acceleration, i.e. centripetal acceleration in a circular motion while turning. The yaw rate, the steering angle, the longitudinal acceleration and the lateral acceleration are detected by sensors, which are preferably arranged on the vehicle.
In a next method step, lateral speed information of the vehicle is calculated from the detected yaw rate, steering angle, longitudinal acceleration and lateral acceleration by means of an electronic control unit of the airbag. In other words, the calculation is performed within the electronic controller of the airbag for obtaining accurate lateral velocity information from the detected yaw rate, steering wheel angle, longitudinal acceleration and lateral acceleration.
In a subsequent method step, the ignition threshold of the airbag is lowered if the lateral speed information satisfies the set condition. In other words, the lateral velocity information is compared with the setting conditions stored in advance in the electronic controller of the airbag, and the ignition condition of the airbag is lowered when the lateral velocity information satisfies the setting conditions.
In a next method step, the airbag of the airbag is detonated, i.e. ejected, by the electronic control unit on the basis of the lateral acceleration according to the reduced ignition threshold. That is, since the ignition threshold of the airbag is lowered with reference to the lateral velocity information, the airbag is caused to detonate in advance at the same lateral acceleration, that is, the side airbag and the side curtain are detonated under the lowered condition, as compared with the prior art method in which the ignition threshold is not reached at the lateral acceleration originally, under the same lateral acceleration, thereby more securely protecting the occupant in the side pillar collision.
The consideration underlying the present invention is that during a side impact, if the lateral velocity is high, it means that the probability of a side impact being generated is high. At this time, by introducing lateral velocity information into the ignition decision logic, i.e., when determining the ignition threshold of the airbag, to lower the ignition threshold or to adjust the characteristics in the ignition decision logic, the side impact can be issued an ignition command earlier, so that the ignition requirements of the customer can also be met in the side pillar impact situation. Moreover, the method is more stable because the reference information is more comprehensive. Therefore, when the automobile is collided with by the side column, the safety of the passengers can be improved by the method.
In an advantageous embodiment, the yaw rate, the steering wheel angle, the longitudinal acceleration and the lateral acceleration of the vehicle can be detected by a Combo sensor. That is, the plurality of parameters may be measured by only one sensor. The advantage here is that the Combo sensor has a high measurement accuracy, so that it is possible to accurately detect the yaw rate, the steering wheel angle, the longitudinal acceleration and the lateral acceleration of the vehicle, and thus to accurately obtain the lateral velocity information, and thus to accurately determine the airbag ignition timing. Furthermore, since the measurement is implemented using only one Combo sensor, the number of parts is saved.
Advantageously, the Combo sensor is fitted within the electronic controller of the airbag. That is, the method of the present invention may be readily implemented by adding a Combo sensor to an existing airbag.
As an alternative embodiment, the yaw rate, the steering wheel angle, the longitudinal acceleration and the lateral acceleration of the vehicle may also be obtained by a plurality of sensors that are inherently provided on the vehicle, such as a steering wheel angle sensor, a wheel speed sensor, a yaw rate sensor, a lateral acceleration sensor, a longitudinal acceleration sensor. Nowadays more and more vehicles are provided with active safety systems ESC (electronic stability control). It is well known that yaw rate, steering wheel angle, longitudinal acceleration and lateral acceleration are the necessary inputs for proper operation of the ESC system. The ESC system judges the intention of the driving direction of the driver and monitors the driving state of the automobile at any time according to the input quantity, and determines how to comprehensively regulate and control the traction force and the braking force of the engine according to the intention so as to keep the automobile to drive on a correct track. The yaw rate, the steering wheel angle, the longitudinal acceleration and the lateral acceleration can therefore also be provided directly from the measurement values or sensor data of the vehicle sensors provided for the ESC system. The advantage here is that the measurement values can be obtained using the components of the vehicle which are present in itself, without additional expenditure.
In an advantageous embodiment, the electronic control unit of the airbag comprises a Kalman filter, by means of which the transverse speed information of the vehicle is calculated from the detected yaw rate, steering wheel angle, longitudinal acceleration and lateral acceleration. The kalman filter is a highly efficient recursive filter (autoregressive filter) that can estimate the state of a dynamic system from a series of measurements that do not contain all the noise. In order to calculate the vehicle lateral velocity from the detected yaw rate, steering wheel angle, longitudinal acceleration and lateral acceleration, the kalman filter accomplishes this task most efficiently and with relatively small computational resource requirements, although the filter can be designed arbitrarily. The advantage here is that accurate lateral vehicle speed information can be obtained in a less expensive manner.
In an advantageous embodiment, the lateral velocity information may be considered to satisfy the set condition when the lateral velocity is greater than a predetermined threshold. The advantage here is that the method according to the invention can be implemented in a simple manner. Alternatively, it may be provided that the lateral speed information is considered to satisfy the setting condition when an average value of the lateral speed over a period of time is greater than a predetermined threshold value.
In an advantageous embodiment, reducing the airbag ignition threshold comprises reducing the lateral acceleration threshold. The advantage here is that the method according to the invention can be implemented in a simple manner.
In another advantageous embodiment, lowering the airbag ignition threshold includes adjusting other characteristics in the ignition decision logic. Vehicle integrated state information is considered, which includes a plurality of variables, such as lateral acceleration provided by sensors, pressure experienced by side door panels provided by other sensors, such as pressure sensors, and other variables derived from these data.
In an embodiment, the lateral acceleration on which the airbag is detonated can be detected by a further sensor, for example a lateral acceleration sensor, arranged in the airbag, which is different from the Combo sensor. Therefore, the lateral acceleration may differ in value from the lateral acceleration detected by the Combo sensor for calculating the lateral velocity information.
The invention is not limited to the combination of features of the claims. For a person skilled in the art, especially if the person claims and/or individual claim features and/or features of the description themselves make possible further reasonable combinations of the claimed and/or individual claim features and/or features of the description, especially if these are set forth in their tasks and/or by comparison with the prior art.
Drawings
The method according to the invention is explained in detail below with reference to the drawing by means of an exemplary embodiment. This example is a preferred embodiment of the present invention, but the present invention is not limited thereto. Wherein the content of the first and second substances,
fig. 1 shows a schematic block diagram of an airbag of the present invention.
Fig. 2 shows a schematic block diagram of an electronic control of the airbag in fig. 1.
Detailed Description
Fig. 1 shows an embodiment of an airbag 10 according to the invention. The airbag 10 includes a sensor for detecting lateral acceleration ay1For measuring lateral acceleration a based on the lateral acceleration 1y1An electronic controller 2 for determining whether the gas generator should be fired for detonation, a gas generator 3 for generating a large amount of gas to inflate the airbag, and an airbag 4. The controller 2 comprises a microprocessor 21 and a memory device 22 for storing, for example, an ignition threshold value. The above-mentioned partThe construction of the elements and their operation are known in the art and will not be described in detail here.
In the present embodiment, as shown in fig. 2, the controller 2 further includes a Combo sensor 23 and a kalman filter 24. The Combo sensor 23 is a high-precision sensor capable of detecting yaw rate, steering angle α, and longitudinal acceleration axAnd lateral acceleration ay2. These measurements or sensor data are transmitted to the kalman filter 24. The kalman filter is a highly efficient recursive filter (autoregressive filter) that can estimate the state of a dynamic system from a series of measurements that do not contain all the noise. Here, the kalman filter 24 is based on the yaw rate yawrate, the steering wheel angle α, and the longitudinal acceleration a provided by the Combo sensorxAnd lateral acceleration ay2And calculating transverse speed information. In the simplest example, the lateral velocity information is the lateral velocity vy. Other lateral speed-related parameters are of course also conceivable.
The lateral velocity information is transmitted to the microprocessor 21 of the controller 2 where it is compared with preset conditions stored in the memory device 22. If the microprocessor 21 determines that: if the lateral speed information satisfies the set condition, the characteristic in the ignition logic judgment is adjusted, and in particular, the predetermined ignition threshold value stored in the storage device 22 is lowered. In the simplest example, the microprocessor 21 will provide the lateral velocity v from the Kalman filter 24yWith a lateral velocity threshold v from the storage device 22y thresholdA comparison is made. When the lateral velocity vyReaches or exceeds its threshold value vy thresholdI.e. vy≧vy thresholdAnd if so, the transverse speed information is considered to meet the set conditions. At this time, the microprocessor 21 lowers the ignition threshold stored in the storage device 22. In the simplest case, the ignition threshold is, for example, a lateral acceleration threshold ay threshold. That is, when v isy≧vy thresholdWhen a is iny thresholdIs reduced to a'y thresholdWherein, a'y threshold<ay thresholdAnd the reduced ignition threshold value a'y thresholdStored in the storage means 22. Then, when the lateral acceleration a obtained by the lateral acceleration sensor 1y1Reaching or exceeding the reduced ignition threshold a'y thresholdIn this case, a start signal is transmitted to the gas generator 3 to ignite and detonate the airbag. Therefore, since the ignition threshold is lowered with reference to the lateral velocity information, the ignition command is issued earlier at a reduced lateral acceleration in the event of a side pillar collision, so that the airbag is detonated earlier, and thus the occupant safety is improved, as compared with the related art.
In an alternative embodiment, the lateral acceleration a provided by the lateral acceleration sensor 1 may also not be usedy1But on the lateral acceleration a detected by the Combo sensory2To and from the ignition threshold ay thresholdAnd (6) comparing. In this case, the lateral acceleration sensor 1 may be omitted.
Alternatively, the ignition threshold value may also be a specified ignition condition in which the vehicle state is taken into account, for example, the lateral acceleration exceeds the lateral acceleration threshold value and the pressure to which the side door panel is subjected exceeds the pressure threshold value.
Claims (10)
1. A method of detonating an airbag (10), in particular a side airbag and/or an airbag curtain, of a vehicle, comprising the steps of:
-detecting yaw rate, steering wheel angle, longitudinal acceleration and lateral acceleration of the vehicle by means of sensors;
-calculating lateral speed information of the vehicle from the detected yaw rate, steering wheel angle, longitudinal acceleration, lateral acceleration by means of an electronic control unit (2) of the airbag;
it is characterized in that the preparation method is characterized in that,
-reducing the ignition threshold of the airbag if the lateral velocity information satisfies the set condition; and
-detonating an airbag (4) of an airbag (10) according to a reduced ignition threshold based on the lateral acceleration by the electronic controller (2).
2. Method according to claim 1, characterized in that the yaw rate, the steering wheel angle, the longitudinal acceleration and the lateral acceleration of the vehicle are detected by a Combo sensor (23).
3. Method according to claim 2, characterized in that a Combo sensor (23) is fitted within the electronic controller (2).
4. The method of claim 1, wherein the yaw rate, the steering wheel angle, the longitudinal acceleration, and the lateral acceleration of the vehicle are detected by a plurality of sensors that are inherently provided on the vehicle.
5. The method of claim 4, wherein the plurality of sensors comprises a steering wheel angle sensor, a wheel speed sensor, a yaw rate sensor, a lateral acceleration sensor.
6. Method according to any of the preceding claims, characterized in that the electronic controller comprises a kalman filter (24) designed to calculate the lateral speed information of the vehicle from the detected yaw rate, steering wheel angle, longitudinal acceleration and lateral acceleration.
7. The method according to any one of the preceding claims, wherein the lateral velocity information is considered to satisfy the set condition when the lateral velocity is greater than a lateral velocity threshold.
8. The method of any of the preceding claims, wherein reducing the airbag ignition threshold comprises reducing a lateral acceleration threshold.
9. The method of any one of claims 1-7, wherein reducing the airbag ignition threshold comprises adjusting other characteristics in the ignition decision logic.
10. A method according to claim 2 or 3, characterised in that the lateral acceleration on which the airbag is detonated is detected by a further sensor (1) arranged in the airbag, which is different from the Combo sensor (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910585087.6A CN112172724A (en) | 2019-07-01 | 2019-07-01 | Method for detonating an airbag |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910585087.6A CN112172724A (en) | 2019-07-01 | 2019-07-01 | Method for detonating an airbag |
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| CN112172724A true CN112172724A (en) | 2021-01-05 |
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| CN201910585087.6A Pending CN112172724A (en) | 2019-07-01 | 2019-07-01 | Method for detonating an airbag |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022227941A1 (en) * | 2021-04-30 | 2022-11-03 | 华为技术有限公司 | Method and device for adjusting airbag trigger condition |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5081587A (en) * | 1989-04-12 | 1992-01-14 | Diesel Kiki Co., Ltd. | Control system for actuating vehicle safety devices |
| JP2000344046A (en) * | 1999-06-03 | 2000-12-12 | Asuko Kk | Control system for occupant protection device |
| CN101254771A (en) * | 2007-02-19 | 2008-09-03 | 福特全球技术公司 | System and method for pre-deploying restraints countermeasures using pre-crash sensing and post-crash sensing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022227941A1 (en) * | 2021-04-30 | 2022-11-03 | 华为技术有限公司 | Method and device for adjusting airbag trigger condition |
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