CN111469798A

CN111469798A - Pedestrian lower limb protection device, system and method for vehicle

Info

Publication number: CN111469798A
Application number: CN202010199591.5A
Authority: CN
Inventors: 胡帅帅; 吕晓江; 张海洋; 周大永
Original assignee: Zhejiang Geely Holding Group Co Ltd; Zhejiang Geely Automobile Research Institute Co Ltd
Current assignee: Zhejiang Geely Holding Group Co Ltd; Zhejiang Geely Automobile Research Institute Co Ltd
Priority date: 2020-03-20
Filing date: 2020-03-20
Publication date: 2020-07-31

Abstract

The invention discloses a pedestrian lower limb protection device, a pedestrian lower limb protection system and a pedestrian lower limb protection method for a vehicle, wherein the pedestrian lower limb protection device is arranged above an air inlet grille of a front bumper of the vehicle and positioned on the inner side of the front bumper of the vehicle, a tear line is arranged on the outer side of the front bumper, the pedestrian lower limb protection device comprises a bumper safety air bag and an air generator of the safety air bag, the bumper safety air bag can be unfolded through bursting the tear line, and the unfolded bumper safety air bag can at least cover the middle part of the front bumper, the area above the middle part of the front bumper and the front edge area of an engine hood body. After the safety airbag of the bumper is unfolded, the lower limbs of personnel outside the vehicle are almost completely separated from the front bumper and the engine cover body, so that the lower limbs of the personnel outside the vehicle can be prevented from being directly contacted with the front bumper and the engine cover body, the lower limbs of the personnel outside the vehicle are greatly protected, and the better buffering and energy-absorbing functions are provided, so that the lower limbs of the personnel outside the vehicle can be better protected.

Description

Pedestrian lower limb protection device, system and method for vehicle

Technical Field

The invention relates to the technical field of pedestrian protection, in particular to a pedestrian lower limb protection device, system and method for a vehicle.

Background

With the development of society, automobiles as a means of riding instead of walk began to walk into thousands of households. The safety performance of an automobile as a vehicle is also attracting more and more attention, and the safety of the automobile is not only limited to the safety protection of the passengers in the automobile, but also required to be capable of effectively protecting the safety of the pedestrians once the automobile collides with the pedestrians.

Current pedestrian protection schemes generally fall into the following categories: the pedestrian protection scheme based on the active safety technology can sense and prevent in advance when a sensor detects that collision danger exists, realize long-distance forward accident prevention, assist a driver to apply enough brake, and automatically perform emergency brake if the driver does not take any brake measure, so that collision is avoided or collision speed is reduced; (II) a pedestrian protection scheme based on a driving and passive integration technology, wherein a bounce type hood is adopted, when a vehicle detects personnel outside the vehicle (a pedestrian, a two-wheel vehicle driver or a three-wheel vehicle driver) and inevitably collides with the vehicle, the collision speed reaches a certain requirement, the bounce type hood can be lifted upwards by taking the front of the hood as an axis, the buffer space on the lower side of the hood is enlarged, and collision injury is reduced to the maximum extent when the head and the chest of the personnel outside the vehicle hit the hood; and thirdly, a pedestrian protection scheme based on a passive safety technology adopts a vehicle bumper assembly, the bumper assembly consists of a shell, a buffer material and a cross beam, and the buffer material is arranged between the shell and the cross beam and protects personnel outside the vehicle by buffering low-speed collision (generally not higher than 4km/h) of the vehicle.

Although the pedestrian protection scheme based on the active safety technology can realize long-distance forward accident prevention, the pedestrian protection scheme is relatively difficult to predict the short-distance and sudden invasion of the outside personnel of the vehicle, and can not completely avoid the collision with the outside personnel of the vehicle, and when the collision of the outside personnel of the vehicle and the vehicle can not be avoided, the front bumper of the vehicle plays a very important role in protecting the lower limbs of the outside personnel of the vehicle.

Patent publication No. CN105270302A discloses a bumper assembly including an airbag, the bumper assembly 10 including a bumper 14 and an energy-absorbing element 16 adjacent to the bumper 14, as shown in fig. 1. The airbag module 18 includes an inflator 22 supported by the bumper 14 and an airbag 20 connected to the inflator 22. The airbag 20 is disposed between the bumper 14 and the energy-absorbing member 16. As shown in fig. 2, the airbag 20 is in a deflated state during normal operation of the vehicle. As shown by the broken lines in fig. 2, the airbag 20 is inflated to a deployed state during a frontal collision. The airbag 20 deploys during a collision between the vehicle and an object to change the stiffness of the bumper assembly 10 during the collision. If the controller determines that the sensed object is a pedestrian, the collision sensing system determines whether a collision has occurred. If a collision is not imminent, no action is taken by the collision sensing system. If a collision is imminent, the controller commands the controllable output gas generator 22 to inflate the airbag 20 to a predetermined state, such as a pedestrian deployment state. The airbag 20 inflates between the bumper 14 and the energy absorbing member 16, moving the energy absorbing member 16 toward the fascia 38 and away from the bumper 14; alternatively, the airbag 20 can rupture the energy-absorbing element 16 and extend through the energy-absorbing element 16 toward the cover panel 38; the airbag 20 may also extend through the panel 38 during deployment of the airbag 20. In conclusion, the bumper assembly 10 can better protect the leg of the pedestrian, especially the lower leg of the pedestrian, by reducing the rigidity of the bumper assembly 10 when the pedestrian is collided. However, the technical solution of the patent still has the following disadvantages:

1) as shown in fig. 3, when the airbag in the bumper assembly is deployed for pedestrian protection purposes, the force for buffering is mainly the force transmitted from the vicinity of the knees and along the X direction, when the vehicle front bumper receives the vertical force (the force direction is downward along the Z direction) and the oblique force (the force direction is downward along the right direction in figure 3), the force is mainly the contact force transmitted by thighs and the crotch, at the moment, the safety air bag does not have the functions of supporting and buffering any more, the main supporting and buffering function for the vertical force and the oblique force is a front bumper assembly structure, which comprises a plastic part and a metal part, therefore, compared with the longitudinal direction (the force direction is along the X direction), the buffering and energy absorption effects of the safety air bag on vertical and oblique collision forces are relatively low, the protection effect on the thighs, the crotch, the ribs and other parts of people outside the vehicle in pedestrian collision is relatively insufficient;

2) the safety air bag in the bumper assembly is arranged between the energy absorption element and the bumper, and the gas generator is arranged on the inner side or the outer side of the bumper, so that the assembly is complex;

3) the airbag in the bumper assembly can cause deformation or rupture of the energy-absorbing element and the fascia, which is highly destructive and costly to maintain.

Disclosure of Invention

The present invention is directed to a pedestrian lower limb protection apparatus, system and method for a vehicle, which solves the above problems in the prior art.

In order to achieve the above purpose, the invention provides the following technical scheme:

the invention provides a pedestrian lower limb protection device of a vehicle, which is arranged above an air inlet grid of a front bumper of the vehicle and is positioned at the inner side of the front bumper of the vehicle, the outer side of the front bumper is provided with a tearing line,

pedestrian's low limbs protection device include bumper air bag and be used for to the inflated air bag gas generator of bumper air bag, bumper air bag can be torn through the blasting the tear line expandes, can cover at least after the bumper air bag expandes in the middle part of front bumper region and engine hood body leading edge region more than the middle part of front bumper.

Furthermore, the device also comprises an air bag housing, the air bag housing is arranged on the outer sides of the bumper air bag and the air bag gas generator, and the top end of the air bag housing is connected with the front bumper.

Further, the device further comprises a housing container which is arranged on the outer side of the airbag housing and is connected with the airbag housing.

Further, the device further comprises a fixing bracket, and the shell container is fixed on the vehicle through the fixing bracket.

Further, the device further comprises a fabric, one end of the fabric is connected with the bumper airbag, and the other end of the fabric is connected with the airbag housing.

Furthermore, a sealing strip is arranged at the contact position of the front edge of the engine hood body and the front bumper.

In another aspect of the present invention, a pedestrian lower limb protection system for a vehicle is provided, which includes a sensor, a controller and the pedestrian lower limb protection device,

the sensor is used for sensing first collision information and second collision information and sending the first collision information and the second collision information to the controller;

the controller is used for judging whether a front collision danger exists or not according to the first collision information; when the front collision danger exists, judging whether the front collision is about to occur or not; when the frontal collision is about to occur, judging whether the frontal collision reaches a preset collision degree; and when the frontal collision reaches the preset collision degree, controlling the safety airbag gas generator to inflate the safety airbag of the bumper to work according to the second collision information.

Further, the first collision information includes speed information and distance information of a person outside the vehicle, and the second collision information includes age information, height information, and stature information of the person outside the vehicle.

In another aspect, the present invention provides a method for protecting a lower limb of a pedestrian using the system for protecting a lower limb of a pedestrian, the method comprising:

sensing first collision information by using a sensor, and sending the first collision information to a controller;

the controller judges whether a front collision danger exists or not according to the first collision information;

when the front collision danger exists, the controller judges whether the front collision is about to occur or not;

when the frontal collision is about to occur, the controller judges whether the frontal collision reaches a preset collision degree;

when the frontal collision reaches a preset collision degree, sensing second collision information by using the sensor, and sending the second collision information to the controller;

and the controller controls the air bag gas generator to inflate the bumper air bag according to the second collision information.

Further, the controller controlling the airbag inflator to inflate the bumper airbag according to the second collision information includes:

and the controller controls the air bag gas generator to deliver gas with a preset volume to the bumper air bag at a preset rate according to the second collision information so that the bumper air bag is unfolded to a preset shape, a preset volume and a preset position.

The pedestrian lower limb protection device, the system and the method for the vehicle have the following beneficial effects:

1. the pedestrian lower limb protection device is arranged above the front bumper air inlet grille of the vehicle and is positioned on the inner side of the front bumper, so that the assembly is simpler;

2. when the safety air bag of the bumper is unfolded, the front bumper is mainly damaged, other parts are not obviously damaged, and the maintenance cost after collision is relatively low;

3. after being unfolded, the safety airbag of the bumper can at least cover the middle part of the front bumper, the area above the middle part of the front bumper and the front edge area of the engine cover body, almost completely separate the lower limbs of personnel outside the vehicle from the front bumper and the engine cover body, can prevent the lower limbs of the personnel outside the vehicle from directly contacting with the front bumper and the engine cover body, and provides great protection effect for the lower limbs of the personnel outside the vehicle;

4. compared with a front bumper, the bumper safety airbag is softer, can be directly contacted with the lower limbs of the personnel outside the vehicle when the vehicle collides with the personnel outside the vehicle, provides better buffering and energy absorption effects, and can better protect the lower limbs of the personnel outside the vehicle.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical means in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is an exploded view of a prior art bumper assembly including an airbag;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is a schematic view of the direction of force applied to the front bumper of the vehicle during deployment of the airbag of FIG. 1;

fig. 4 is a schematic view illustrating an installation position of a pedestrian lower limb protection apparatus for a vehicle according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a pedestrian lower limb protection device of a vehicle according to an embodiment of the present invention;

FIG. 6 is a schematic view of the bumper airbag of FIG. 4 as it is deployed;

FIG. 7 is a schematic illustration of the bumper airbag of FIG. 4 after deployment;

FIG. 8 is a view showing the effect of the bumper airbag according to the embodiment of the present invention after being deployed;

FIG. 9 is a view illustrating the effect of a bumper airbag including fabric according to an embodiment of the present invention after deployment;

FIG. 10 is a representation of the effect of an alternative bumper airbag including fabric, according to an embodiment of the present invention, after deployment;

FIG. 11 is a view showing the effect of a further bumper airbag including fabric according to an embodiment of the present invention after deployment;

FIG. 12 is a schematic view of the installation position of the partition board according to the embodiment of the present invention;

FIG. 13 is a schematic flow chart illustrating a method for protecting a lower extremity of a pedestrian using the system of the present invention;

in the figure: 10-bumper assembly, 14-bumper, 16-energy-absorbing element, 18-airbag module, 20-airbag, 22-gas generator, 40-front-bumper grille, 41-engine hood, 42-front bumper, 50-bumper airbag, 51-airbag gas generator, 52-airbag housing, 53-housing receptacle, 54-mounting bracket, 55-weather strip, 80-tear block, 90-fabric, 110-first tear block, 111-second tear block, 120-spacer.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that, as the terms "upper", "lower", "front", "rear", "inner", "outer", etc. appear, their indicated orientations or positional relationships are based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second," if any, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that unless expressly stated or limited otherwise, the terms "mounted" and "connected" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Examples

As shown in fig. 4, the pedestrian lower limb protection apparatus according to the embodiment of the present invention may be mounted above a front bumper grille 40 of a vehicle in a front edge region of an engine cover 41 and inside a front bumper 42. The assembly is simpler than the conventional assembly in which the bumper airbag is mounted between the energy-absorbing element and the bumper and the airbag inflator is mounted inside or outside the bumper.

As shown in fig. 5, the apparatus includes a bumper airbag 50, and the shape of the bumper airbag 50 may be designed as needed as long as it is ensured that the bumper airbag 50 can cover at least the middle portion of the front bumper 42, the region above the middle portion of the front bumper 42, and the front edge region of the engine cover 41 after deployment.

The region above the middle portion of the front bumper 42 refers to a region extending from the middle portion of the front bumper 42 toward the engine cover 41, for example, a region extending from the middle portion of the front bumper 42 toward the engine cover 41 by an equal distance of 5cm, 10cm, 15cm, or 20cm, and the distance extending from the middle portion of the front bumper 42 toward the engine cover 41 may be set as needed. The front edge region of the engine cover 41 refers to a region extending from the engine cover 41 toward the front bumper 42, for example, a region extending from the engine cover 41 toward the front bumper 42 by an equal distance of 5cm, 10cm, or 15cm, and the distance extending from the engine cover 41 toward the front bumper 42 may be set as needed.

Further, the apparatus further includes an airbag gas generator 51, and the airbag gas generator 51 is connected to the bumper airbag 50, and is configured to inflate the bumper airbag 50.

In some embodiments, the airbag inflator 51 may be a conventional airbag inflator, such as a pyrotechnic airbag inflator, which has a predetermined output gas rate, volume, etc. and is fixed at a later time.

In other embodiments, the airbag inflator 51 may also be a controllable output type airbag inflator, and the airbag inflator 51 may be controlled to output a corresponding gas volume at a corresponding rate according to the collision information (such as the speed information and distance information of the vehicle exterior person and the age information and stature information of the vehicle exterior person) acquired by the bumper airbag system control unit or other controller, so as to better protect the vehicle exterior person.

In the embodiment of the present invention, the person outside the vehicle may be any suitable person such as a pedestrian, a two-wheel vehicle driver, a three-wheel vehicle driver, a two-wheel vehicle passenger, or a three-wheel vehicle passenger.

Further, the apparatus further includes an airbag case 52, and the airbag case 52 is disposed outside the bumper airbag 50 and the airbag inflator 51.

In some embodiments, the bumper airbag 50 may be folded and placed within the airbag housing 52, and the airbag inflator 51 may be placed at the bottom of the airbag housing 52.

In some embodiments, the airbag housing 52 may be made of plastic, and in other embodiments, the airbag housing 52 may be made of other materials, which are not limited herein.

In some embodiments, the top end of the airbag housing 52 may be connected to the front bumper 42. The air bag housing 52 and the front bumper 42 may be connected by a snap connection, or may be connected by other connection methods, such as a bolt connection, and the like, and are not limited in this respect.

Further, the apparatus further includes a housing case 53, and the housing case 53 is disposed outside the airbag housing 52, and is configured to support and accommodate the airbag housing 52, and to resist an impact force when the bumper airbag 50 is exploded, so as to prevent the bumper airbag 50 from being deployed and rushed out of a portion other than the bumper airbag outlet, and to prevent a large airbag deployment impact force from causing shaking and displacement of the airbag housing 52, which may affect normal deployment of the bumper airbag 50 from the bumper airbag outlet.

In some embodiments, the housing container 53 may be made of a metal material, such as steel, aluminum alloy, and aluminum magnesium alloy, and in other embodiments, the housing container 53 may also be made of other materials, such as carbon fiber, and the like, which is not limited herein.

In some embodiments, the housing receptacle 53 may be coupled to the airbag housing 52. The housing container 53 and the airbag housing 52 may be connected by glue, or may be connected by bolts or rivets, and the connection is not limited in this respect.

Further, the device further comprises a fixing bracket 54, and the fixing bracket 54 is connected with the housing container 53. The fixing bracket 54 and the housing container 53 may be connected by bolts or other connection methods, and are not limited in this respect.

In some embodiments, the fixing bracket 54 may be coupled to a vehicle body for fixing the housing receptacle 53 to the vehicle body. For example, the mounting bracket 54 may be secured to the cowl top rail to provide better support and mounting. Of course, the fixing bracket 54 may be mounted at other positions of the vehicle body as required, and is not particularly limited herein.

Further, a sealing strip 55 is arranged at a contact position of the front edge of the engine hood body 41 and the front bumper 42, and the sealing strip 55 can prevent rainwater and the like from flowing into the engine compartment and can prevent the front bumper 42 from being turned backwards except for the tearing block. Wherein the tear block refers to a portion of the front bumper 42 at the outlet of the bumper airbag.

In some embodiments, the tear block is provided with a tear line and a folding line, wherein the tear line can be specifically set according to needs, and the tear line is convenient for the bumper airbag 50 to perform the function similar to a bumper airbag outlet when the bumper airbag 50 is exploded, so that the bumper airbag 50 is deployed towards a needed direction. Referring to fig. 4, a dotted line portion YWXZ in fig. 4 is a tear line, and a solid line portion YZ in the drawing is a folding line, the thickness of the tear line may be 0.3 to 0.6mm, the outer surface of the area where the tear line is located is smooth, and an indentation is formed along the dotted line inside, so that the appearance of the outer surface of the front bumper 42 is ensured, and the function of the front bumper 42 that is torn to deploy the bumper airbag 50 is not affected.

As shown in fig. 4 to 6, when the bumper airbag 50 is deployed by a point explosion, the deployment force tears the tear line YWXZ on the front bumper 42, and the torn portion is folded upward along the fold line YZ, thereby making room for the deployment of the bumper airbag 50. Since the bumper airbag 50 is deployed while mainly damaging the front bumper 42 without significant damage to other components, the post-collision repair cost is relatively low.

As shown in fig. 4 and 7, the bumper airbag 50 according to the embodiment of the present invention may be shaped like a rectangular plate cushion that is bent after being deployed, and may cover at least the middle portion of the front bumper 42, the area above the middle portion of the front bumper 42, and the front edge area of the engine cover 41 in the width direction, and may cover the area near the daytime running lights in the length direction, and may almost completely separate the lower limbs of the vehicle occupant from the front bumper 42 and the engine cover 41, and may prevent the lower limbs of the vehicle occupant from directly contacting the front bumper 42 and the engine cover 41, thereby providing a great protection effect to the lower limbs of the vehicle occupant. Moreover, the bumper airbag 50 is more flexible than the front bumper 42, and can directly contact with the lower limbs of the vehicle outside when the vehicle collides with the vehicle outside, thereby providing better cushioning and energy absorbing functions and better protecting the lower limbs of the vehicle outside.

Further, as shown in fig. 5 and 8, after the bumper airbag 50 is deployed, the seal strip 55 at the contact portion of the front edge of the engine cover 41 and the front bumper 42 and the tear block 80 of the front bumper 42 are folded back, and the seal strip 55 and the tear block 80 are folded back and simultaneously receive a forward resistance force, which acts on the deployed bumper airbag 50 through the tear block 80, so that the tendency of the bumper airbag 50 to sway after being deployed and to slide back when colliding with a person outside the vehicle can be reduced, thereby assisting the bumper airbag 50 to perform a better protection function.

In some embodiments, the device may further include a fabric, which may be disposed inside the bumper airbag 50.

In some embodiments, as shown in fig. 9, the bumper airbag 50 may be a single body, the upper end of the fabric 90 is sewn together with both sides of the bumper airbag 50, respectively, by bifurcating, and the lower end of the fabric 90 is connected to the airbag housing 52. In other embodiments, as shown in fig. 10, the bumper airbag 50 may be two pieces, the fabric 90 may not be bifurcated, and the two bumper airbags 50 are respectively sewn together with the fabric 90 by being folded inward to constitute one complete bumper airbag 50.

The fabric 90 serves to fix the deployed bumper airbag 50 and to prevent the bumper airbag 50 from shaking at the beginning of deployment and when it collides with a person outside the vehicle. Also, when the bumper airbag 50 excessively elongates the fabric 90 by slipping backward, the bumper airbag 50 is subjected to a forward resistance force exerted by the fabric 90 since the length of the fabric 90 itself is constant, and the backward slipping of the bumper airbag 50 can be prevented. Further, when the bumper airbag 50 slips rearward, it is hindered by an element below the bumper airbag 50, and the bumper airbag 50 can be further hindered from slipping rearward, thereby assisting the bumper airbag 50 in a better protective effect.

In some embodiments, as shown in fig. 5 and 11, the tearing line on the front bumper 42 may also be located in the middle of the tearing block on the front bumper 42, so that after the tearing block is torn along the tearing line, the tearing block is divided into two pieces, which are respectively folded upwards and downwards to form the first tearing block 110 and the second tearing block 111. First tear piece 110 with second tear piece 111 all has the power of resisting turning over a book to exist, and the direction of two resistance forces all faces the inboard of bumper air bag 50, can transmit after the expansion bumper air bag 50 is last, to after the expansion bumper air bag 50 has played fine fixed action, hinders rocking and sliding of bumper air bag 50 in the beginning and collision after the expansion to better protect vehicle outsiders.

In some embodiments, as shown in fig. 5 and 12, a partition 120 may be further provided inside the airbag housing 52 to separate the bumper airbag 50 from the airbag inflator 51, so that the folded bumper airbag 50 may be supported and the strength of the airbag housing 52 may be increased to prevent the airbag housing 52 from being broken when the bumper airbag 50 is exploded. The number of the partition plates 120 can be adjusted according to actual needs. The strength of the partition 120 can also be adjusted according to actual needs, for example, to reduce weight, such as designing lightening holes.

The embodiment of the invention also provides a pedestrian lower limb protection system of the vehicle, which comprises an inductor, a controller and the pedestrian lower limb protection device. The sensor is used for sensing first collision information and second collision information and sending the first collision information and the second collision information to the controller. The controller is used for judging whether a front collision danger exists or not according to the first collision information; when the front collision danger exists, judging whether the front collision is about to occur or not; when the frontal collision is about to occur, judging whether the frontal collision reaches a preset collision degree; and when the frontal collision reaches a preset collision degree, controlling the air bag gas generator 51 to inflate the bumper air bag 50 according to the second collision information.

In some embodiments, the sensor may be any one or more of a camera (e.g., a monocular camera, etc.), a millimeter wave radar (e.g., a long range millimeter wave radar), an ultrasonic radar, and a laser radar.

In a specific example, the sensor may be a monocular camera and a long-range millimeter wave radar, the maximum detection distance of the long-range millimeter wave radar reaches 180m, the distance measurement accuracy reaches 0.175m, the speed measurement range reaches-80 to 80m/s, the speed measurement accuracy reaches 0.05m/s, the detection distance of the monocular camera to personnel outside the vehicle reaches 80m, and the combined use of the two can detect the personnel outside the vehicle and their distance information and speed information in advance, and transmit the distance information and speed information to the controller (such as an ACU or an ECU).

In some embodiments, the first collision information includes speed information and distance information of a person outside the vehicle, and the second collision information includes age information, height information, and stature information of the person outside the vehicle.

An embodiment of the present invention further provides a method for protecting a lower limb of a pedestrian using the system for protecting a lower limb of a pedestrian, as shown in fig. 13, where the method includes:

s101, sensing first collision information by using a sensor, and sending the first collision information to a controller.

Specifically, the sensing of first collision information by the sensor and the sending of the first collision information to the controller includes:

the speed information and the distance information of the person outside the vehicle are sensed by the sensor, and the sensed speed information and distance information of the person outside the vehicle are sent to the controller.

And S102, the controller judges whether a front collision danger exists or not according to the first collision information.

Specifically, the determining, by the controller, whether there is a front collision risk according to the first collision information includes:

and the controller judges whether the front collision danger of the vehicle and the personnel outside the vehicle exists or not according to the speed information and the distance information of the personnel outside the vehicle.

And S103, if yes, the controller judges whether frontal collision is about to occur.

And S104, if so, judging whether the front collision reaches a preset collision degree by the controller.

Wherein the preset collision degree refers to a preset speed of the vehicle when the vehicle collides with a person outside the vehicle.

It can be understood that if the vehicle collides with the vehicle external personnel at a low speed, even if the bumper airbag is not ignited, the front bumper of the vehicle will not cause obvious injury to the vehicle external personnel, and at this time, if the bumper airbag is ignited, the protection effect is not exerted, and unnecessary economic loss is also caused.

And S105, if yes, sensing second collision information by using the sensor, and sending the second collision information to the controller.

Specifically, when the frontal collision reaches a preset collision degree, sensing second collision information by using the sensor, and sending the second collision information to the controller includes:

when the front collision reaches the preset collision degree, the sensor is utilized to sense the age information, the height information and the stature information of the personnel outside the vehicle, and the sensed age information, height information and stature information of the personnel outside the vehicle are sent to the controller.

And S106, controlling the safety airbag gas generator to inflate the safety airbag of the bumper to work by the controller according to the second collision information.

Specifically, the controller controls the airbag inflator to inflate the bumper airbag according to the second collision information, and the controller includes:

the controller controls the safety airbag gas generator to convey gas with a preset volume to the bumper safety airbag at a preset speed according to age information, height information and stature information of people outside the vehicle, so that the bumper safety airbag is unfolded to a preset shape, a preset volume and a preset position.

The controller controls the safety airbag gas generator to inflate the safety airbag of the bumper according to the second collision information, and unnecessary injury to personnel outside the vehicle due to inappropriate pressure and volume of the safety airbag of the bumper after expansion can be avoided. For example, when the vehicle collides with a person outside the vehicle at a high speed and the person outside the vehicle is thin, if the pressure of the deployed bumper airbag is high, the deployed bumper airbag is not soft enough for the pedestrian and is likely to cause an impact injury.

The precedence order of the above embodiments of the present invention is only for description, and does not represent the merits of the embodiments. And specific embodiments thereof have been described above. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the apparatus, system and server embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference may be made to some descriptions of the method embodiments for relevant points.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention.

Claims

1. A pedestrian lower limb protection device of a vehicle is characterized in that the pedestrian lower limb protection device is arranged above a front bumper air inlet grille (40) of the vehicle and is positioned at the inner side of a front bumper (42) of the vehicle, a tear line is arranged at the outer side of the front bumper (42),

pedestrian's low limbs protection device include bumper air bag (50) and be used for to the inflated air bag gas generator (51) of bumper air bag (50), bumper air bag (50) can be torn through the blasting the tear line expandes, can cover at least after bumper air bag (50) expandes in the middle part of front bumper (42) regional and the engine house body (41) leading edge region more than the middle part of front bumper (42).

2. The pedestrian lower limb protection apparatus for a vehicle according to claim 1, further comprising an airbag housing (52), wherein the airbag housing (52) is provided outside the bumper airbag (50) and the airbag inflator (51), and a top end of the airbag housing (52) is connected to the front bumper (42).

3. The pedestrian lower limb protection apparatus of a vehicle according to claim 1, further comprising a housing case (53), the housing case (53) being disposed outside the airbag housing (52) and being connected to the airbag housing (52).

4. Pedestrian lower extremity protection arrangement according to claim 3, characterized in that it further comprises a fixing bracket (54), by means of which fixing bracket (54) the housing receptacle (53) is fixed to the vehicle.

5. The pedestrian lower extremity protection apparatus of a vehicle according to claim 1, further comprising a fabric (90), one end of the fabric (90) being connected to the bumper airbag (50) and the other end of the fabric (90) being connected to the airbag housing (52).

6. The pedestrian lower limb protection device of the vehicle according to claim 1, wherein a sealing strip (55) is provided at a contact portion of the front edge of the engine cover (41) and the front bumper (42).

7. A pedestrian lower limb protection system for a vehicle, comprising a sensor, a controller, and the pedestrian lower limb protection device according to any one of claims 1 to 6,

the controller is used for judging whether a front collision danger exists or not according to the first collision information; when the front collision danger exists, judging whether the front collision is about to occur or not; when the frontal collision is about to occur, judging whether the frontal collision reaches a preset collision degree; and when the frontal collision reaches a preset collision degree, controlling an air bag gas generator (51) to inflate a bumper air bag (50) according to the second collision information.

8. The pedestrian lower limb protection system of a vehicle according to claim 7, wherein the first collision information includes speed information and distance information of a person outside the vehicle, and the second collision information includes age information, height information, and stature information of the person outside the vehicle.

9. A method of protection using the pedestrian lower extremity protection system of claim 7, said method comprising:

the controller controls the airbag inflator (51) to inflate the bumper airbag (50) according to the second collision information.

10. The method according to claim 9, wherein the controller controlling the airbag inflator (51) to inflate the bumper airbag (50) based on the second collision information includes:

the controller controls the airbag inflator (51) to deliver a preset volume of gas to the bumper airbag (50) at a preset rate according to the second collision information, so that the bumper airbag (50) is deployed to a preset shape, a preset volume, and a preset position.