CN112793530A - Functional safety verification method for collision sensor of vehicle airbag system and airbag controller - Google Patents
Functional safety verification method for collision sensor of vehicle airbag system and airbag controller Download PDFInfo
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- CN112793530A CN112793530A CN201911104840.1A CN201911104840A CN112793530A CN 112793530 A CN112793530 A CN 112793530A CN 201911104840 A CN201911104840 A CN 201911104840A CN 112793530 A CN112793530 A CN 112793530A
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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
- B60R21/0136—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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
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- Automation & Control Theory (AREA)
- Air Bags (AREA)
Abstract
The invention relates to a functional safety verification method for a crash sensor of an airbag system of a vehicle, comprising the following steps: receiving a first signal from the crash sensor and a second signal from an other sensor; and judging whether the value of the first signal is within a range of a preset first threshold value and whether the value of the second signal is within a range of a preset second threshold value, and if so, considering that the first signal from the collision sensor is valid and considering that the vehicle has collided. The method of the invention can complete the functional safety check of the collision sensor of the airbag system of the vehicle without adding extra cost. The invention also relates to an airbag control device which can carry out the method.
Description
Technical Field
The invention relates to the technical field of vehicles. More particularly, the present invention relates to control of an airbag for a vehicle.
Background
As one type of safety protection device, an airbag or so-called "airbag" has been widely equipped in vehicles, particularly household automobiles. Generally, an airbag can be detonated to expand into a bag or a sphere when certain operating parameters of the vehicle reach a certain threshold range, particularly after a vehicle collision, and absorb the momentum or momentum experienced by an occupant in the vehicle, particularly a driver of the vehicle, by deforming under pressure, thereby providing cushioning to the occupant and serving the purpose of protecting the occupant.
Fig. 1 shows an exemplary vehicle whose airbag system can be equipped with a central channel sensor 1 located inside the body of the vehicle and two external impact sensors 2 located outside the body of the vehicle. The center tunnel sensor 1 may be arranged in the longitudinal direction of the vehicle (i.e., the front-rear direction of the vehicle) so as to be able to sense a collision, such as a frontal collision, along the front-rear direction of the vehicle. The two external impact sensors 2 may be disposed at a front end portion of the vehicle body and spaced apart in a lateral direction (i.e., a left-right direction of the vehicle), and may sense an impact from a front or a side-front of the vehicle.
As an example, the center tunnel sensor 1 may be an acceleration sensor for generating a signal indicative of a collision by sensing a sudden change in the speed of the vehicle, in particular a momentary speed drop transitioning from a normal driving speed to zero. The external impact sensor 2 may be an acceleration sensor for sensing a speed change of the vehicle or a pressure sensor for sensing an external pressure to which the vehicle body is subjected, for generating a signal representing an impact according to the speed change of the vehicle or the pressure to which the vehicle is subjected. It should be noted here that the airbag system of the vehicle may be provided with both the center tunnel sensor 1 and the external collision sensor 2 described above, or may be provided with only the center tunnel sensor 1 without providing the external collision sensor 2 (for example, for cost reasons).
In order to ensure driving safety, it is necessary to prevent the airbag from being detonated under unnecessary conditions (e.g., no collision or normal deceleration) to affect the normal operation of the driver. For this purpose, the crash sensors associated with the airbag should be functionally checked and the initiation process of the airbag should only be initiated if the signal detected by the crash sensors is a valid crash signal. According to known solutions, the mutual verification is generally carried out with different sensors dedicated to the airbag system, such as the aforementioned central tunnel sensor 1 inside the vehicle body and external impact sensor 2. In particular, such mutual verification comprises comparing the signals acquired by two different sensors with respective predetermined threshold values, and performing a summation or logical and operation on the results of these comparisons, said signals being considered valid collision signals only if the result of the operation is "true" (which means that the signals acquired by the different sensors are all within the respective predetermined threshold values).
However, in the case of a vehicle in which only a single sensor is provided in an airbag system, for example, in the case where the vehicle is provided with only an in-vehicle center tunnel sensor and no out-vehicle sensor, if an additional sensor is not additionally provided, the single sensor cannot be functionally checked for safety, and it is not possible to determine whether or not a signal from the single sensor is a valid collision signal.
Disclosure of Invention
The present invention is directed to solving the above-mentioned problems of the prior art and to providing a novel solution that enables functional safety verification of a crash sensor of an airbag system without increasing component costs.
Specifically, the present invention provides a functional safety verification method for a crash sensor of an airbag system of a vehicle, the method including the steps of:
-receiving a first signal from the collision sensor and a second signal from the other sensor; and
-determining whether the value of the first signal is within a preset first threshold value and whether the value of the second signal is within a preset second threshold value, and if so, considering that the first signal from the collision sensor is valid and that the vehicle has collided.
The solution of the invention consists in using existing sensors in the vehicle, which are not conventionally associated with the airbag system (i.e. other sensors), for functional safety checking of the crash sensors of the airbag system. This solution makes full use of sensors in the vehicle which are assigned to different systems, so that the desired safety check of the sensor function can be advantageously implemented without additional sensors and thus without increasing the costs.
The method of the invention comprises the following advantageous technical features, which can be applied individually or in any technically possible combination:
-the method further comprises: if the judgment result is negative, the first signal from the collision sensor is considered to be invalid;
-the method further comprises: allowing the airbag to detonate if the first signal from the crash sensor is valid and the first signal satisfies a detonation condition for the airbag;
-the method further comprises: not allowing the airbag to detonate if the first signal from the crash sensor is invalid or the first signal does not satisfy a detonation condition of the airbag;
-the other sensor is a low range sensor not dedicated to the airbag system but capable of sensing parameters related to the collision of the vehicle;
-the other sensor is a sensor used in a roll-over protection system or an emergency call system of a vehicle;
-the collision sensor is an interior centre tunnel sensor and/or an exterior collision sensor of the vehicle;
-the collision sensor is configured as a single direction sensor; and
-the crash sensor is the only sensor dedicated to the airbag system.
In another aspect, the present invention provides an airbag controller configured to perform the method as described above.
The invention can ensure the stability of the air bag system from the aspect of functional safety, and obviously reduce the risk of mistakenly detonating the air bag, thereby greatly reducing or even eliminating the occurrence of accidents.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
FIG. 1 illustrates an exemplary vehicle;
FIG. 2 shows a control flow of an airbag in a block diagram; and
fig. 3 shows a schematic block diagram of the security verification method of the present invention.
Detailed Description
The technical solutions of the present invention are further described in detail below by way of examples and with reference to the accompanying drawings, which are intended to explain the general concepts of the present invention and should not be interpreted as limiting the invention.
The present invention relates to a vehicle equipped with an airbag system. The airbag system may include an airbag and a controller for controlling or triggering initiation of the airbag. The controller may be in communication with an impact sensor to receive signals sensed by the impact sensor. The collision sensor may sense a parameter related to the operating condition of the vehicle, particularly a parameter of the vehicle that may significantly change upon occurrence of a collision, such as the speed, acceleration, time of change in speed or acceleration of the vehicle (e.g., time of change in speed of the vehicle from a normal vehicle speed to zero), and the magnitude or amount of change in impact force or pressing force to which the vehicle body is subjected.
Referring to fig. 2, there is shown a flow chart of the operation of the controller for controlling the air bag.
In step 100, the controller receives the signals detected by the crash sensors (e.g., sensors 1, 2 described above) and internally adjusts the signals, e.g., parameterizes or digitizes the signals. Next, in step 200, the controller is used to perform a functional safety check on the crash sensors to determine whether the signals collected by the crash sensors are valid crash signals, i.e., to determine whether a crash has actually occurred. In parallel with step 200, the controller performs a calculation using the signals collected by the collision sensor to obtain a physical quantity related to the explosion condition of the airbag (step 300), and compares the calculated physical quantity with a predetermined threshold corresponding to the explosion condition of the airbag to determine whether the explosion condition of the airbag is met by judging whether the physical quantity is within the range of the predetermined threshold (step 400). Then, in the next step 500, a summation operation, or a logical and operation, is performed on the determination result obtained in step 400 and the security check result obtained in step 200. If the result of step 200 indicates that the acquired signal is a valid crash signal and the result of step 400 indicates that the airbag initiation condition is met (at which time the result of the summation operation is yes or true), the controller issues an airbag initiation command to actuate the airbag as shown in step 600. Otherwise, if the result of step 200 indicates that the acquired signal is not a valid crash signal, and/or if the result of step 400 indicates that the airbag initiation condition is not met (when the result of the summation operation is "no" or "false"), the controller will not issue an airbag initiation command.
For this, as is generally known, a controller for an airbag may include functional modules such as an arithmetic module, a comparison and judgment module, a storage module, and an input/output module. For example, the controller may include associated components or circuits such as a processor unit, a memory unit, an input/output unit, and the like.
The functional safety verification method of the crash sensor according to the invention is explained in detail below with reference to fig. 3. The functional safety verification method may be executed by the controller for the airbag by means of, for example, an algorithm or a software program.
First, a signal acquired by one type of crash sensor of the airbag system is received as a signal to be verified (step 210), and a signal acquired by the other sensor is received as an auxiliary signal (step 220). It should be noted here that the crash sensor is a sensor dedicated to the airbag system, in particular the central channel sensor 1 described above. The other sensor is a sensor which is not normally used for the airbag system or is not part of the airbag system, in particular a sensor which can sense a parameter which can be correlated with a crash situation of the vehicle. Preferably, the other sensor is selected from low range sensors, such as sensors typically dedicated to the roll over system (Rollover system) of the vehicle or sensors typically dedicated to the emergency call system (eCall system).
The value of the signal to be verified is then compared with a corresponding predetermined threshold (referred to herein as a "first threshold") to derive a first comparison result, and the value of the auxiliary signal is compared with a corresponding predetermined threshold (referred to herein as a "second threshold") to derive a second comparison result. And if the first comparison result shows that the value of the signal to be checked is in the range of the first threshold value, obtaining a first operator with a logical value of 'yes' or 'true', and otherwise, obtaining a first operator with a logical value of 'no' or 'false'. If the second comparison result shows that the value of the auxiliary signal is within the range of the second threshold value, a second operator with a logical value of "yes" or "true" is obtained, otherwise a second operator with a logical value of "no" or "false" is obtained.
Then, a summation operation or a logical AND operation is performed on the first operator and the second operator. Specifically, if both the value of the first operator and the value of the second operator are "yes" or "true", the operation result is "yes" or "true"; if the value of at least one of the first operator and the second operator is "no" or "false", the operation result is "no" or "false".
And finally, determining the validity of the signal to be checked according to the operation result. If the operation result is 'yes' or 'true', the signal to be verified is determined to be a valid collision signal; if the result of the operation is "no" or "false", the signal to be verified is not determined to be a valid collision signal.
The method of the present invention is particularly suitable for the case where the sensor of the airbag system is a sensor arranged in a single direction (front-rear direction) (as described above, the center tunnel sensor 1 that mainly senses a collision in the front-rear direction of the vehicle). Furthermore, the method according to the invention is particularly suitable for the case of airbag systems which are provided with only a single or dedicated sensor. However, it will be appreciated that even if the airbag system is provided with both a centre tunnel sensor 1 and an exterior body sensor 2 as described above, it is possible to use the method of the invention to perform a functional safety check on both types of crash sensors separately. In addition, the method of the present invention can also be applied to a case where the sensor of the airbag system of the vehicle is arranged in other directions (for example, in a direction rotated at an angle of 45 ° with respect to the front-rear direction).
Although the present general inventive concept has been described in conjunction with the embodiments, it will be understood by those skilled in the art that various changes and modifications may be made to the embodiments without departing from the principles and spirit of the general inventive concept.
Claims (10)
1. A functional safety verification method for a crash sensor of an airbag system of a vehicle, wherein the method comprises the steps of:
receiving a first signal from the crash sensor and a second signal from an other sensor;
and judging whether the value of the first signal is within a range of a preset first threshold value and the value of the second signal is within a range of a preset second threshold value, and if so, considering that the first signal from the collision sensor is valid and considering that the vehicle has collided.
2. The method of claim 1, further comprising:
and if the judgment result is negative, the first signal from the collision sensor is considered to be invalid.
3. The method of claim 2, further comprising:
if the first signal from the crash sensor is valid and the first signal satisfies an airbag initiation condition, the airbag is allowed to detonate.
4. The method of claim 3, further comprising:
if the first signal from the crash sensor is invalid or the first signal does not satisfy the initiation condition of the airbag, the airbag is not allowed to initiate.
5. Method according to one of the preceding claims, characterized in that the other sensor is a low range sensor which is not dedicated to the airbag system but which is able to sense parameters relating to a collision of the vehicle.
6. The method of claim 5, wherein the other sensor is a sensor used in a rollover protection system or an emergency call system of a vehicle.
7. Method according to one of the preceding claims, characterized in that the collision sensor is an internal centre channel sensor and/or an external collision sensor of the vehicle.
8. The method of claim 7, wherein the impact sensor is configured as a single directional sensor.
9. The method of claim 8, wherein the crash sensor is a sensor dedicated to an airbag system.
10. An airbag controller configured to perform the method of any one of the preceding claims.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911104840.1A CN112793530A (en) | 2019-11-13 | 2019-11-13 | Functional safety verification method for collision sensor of vehicle airbag system and airbag controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911104840.1A CN112793530A (en) | 2019-11-13 | 2019-11-13 | Functional safety verification method for collision sensor of vehicle airbag system and airbag controller |
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| CN112793530A true CN112793530A (en) | 2021-05-14 |
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| CN201911104840.1A Pending CN112793530A (en) | 2019-11-13 | 2019-11-13 | Functional safety verification method for collision sensor of vehicle airbag system and airbag controller |
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Citations (9)
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| US20120221211A1 (en) * | 2009-11-24 | 2012-08-30 | Thomas Lich | Method and control unit for detecting the width of an impact area of an object in the front-end section of a vehicle |
| CN102806881A (en) * | 2011-05-31 | 2012-12-05 | 株式会社电装 | Collision detecting device for vehicle and occupant protection system having the same |
| CN203996079U (en) * | 2014-08-07 | 2014-12-10 | 上海通用汽车有限公司 | A kind of air bag device for automobile rear safety guard-safeguard |
| CN107839647A (en) * | 2017-11-29 | 2018-03-27 | 成都市海耀集食科技有限公司 | A kind of control system of safety air bag |
| CN107848478A (en) * | 2015-07-10 | 2018-03-27 | 宝马股份公司 | The automatic identification of low speed collision and assessment |
| CN108146378A (en) * | 2018-01-12 | 2018-06-12 | 吴盼婷 | The control system of safety air bag and electric vehicle of a kind of electric vehicle |
| CN110065462A (en) * | 2018-01-24 | 2019-07-30 | 现代自动车株式会社 | The air bag igniting control system and its control method of vehicle |
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2019
- 2019-11-13 CN CN201911104840.1A patent/CN112793530A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1980819A (en) * | 2004-06-30 | 2007-06-13 | 奥托立夫开发公司 | Device for triggering a vehicle safety device |
| CN1796174A (en) * | 2004-12-28 | 2006-07-05 | 株式会社电装 | Vehicle collision safety system |
| US20120221211A1 (en) * | 2009-11-24 | 2012-08-30 | Thomas Lich | Method and control unit for detecting the width of an impact area of an object in the front-end section of a vehicle |
| CN102806881A (en) * | 2011-05-31 | 2012-12-05 | 株式会社电装 | Collision detecting device for vehicle and occupant protection system having the same |
| CN203996079U (en) * | 2014-08-07 | 2014-12-10 | 上海通用汽车有限公司 | A kind of air bag device for automobile rear safety guard-safeguard |
| CN107848478A (en) * | 2015-07-10 | 2018-03-27 | 宝马股份公司 | The automatic identification of low speed collision and assessment |
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