Front bumper intelligent system for decoupling crashworthiness and pedestrian protection performance

Abstract

The invention designs a front bumper intelligent system for decoupling crashworthiness and pedestrian protection performance, which comprises an intelligent monitoring device, an energy absorption module and an intelligent actuator, and is characterized in that the intelligent monitoring device is composed of a laser radar, a binocular camera, a visual algorithm system and a sensor; the energy absorption module is composed of a front bumper skin, a recoverable empty ring-pull can, a ring-pull can fixing plate, a negative poisson ratio auxetic structure, a sleeve and a front anti-collision cross beam, and the intelligent actuator is composed of a double-end stud, a transmission mechanism and a motor. The front bumper intelligent system is oriented to the green, environment-friendly and safe design concepts, waste of empty zip-top cans is recycled, the effects of light weight, energy conservation and emission reduction are achieved, more importantly, decoupling of crashworthiness and pedestrian protection performance is achieved, and the energy-saving and emission-reducing effects are achieved. And the requirements of low-risk damage of high-value elements in low-speed collision of the automobile and high pedestrian protection performance in pedestrian-automobile collision are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile body, more particularly, to a front bumper intelligent system for decoupling pedestrian protection performance and crashworthiness. BACKGROUND

[0002] According to the data of the National Bureau of Statistics, from 2018 to 2022, the number of private cars in China increased from 438 million to 590 million, an increase of 34.7%. The number of traffic accidents increased from 244937 to 256409, an increase of 4.9%. The number of injured increased from 258532 to 263621, an increase of 2%. This shows that the number of cars in China is increasing, which will inevitably increase the conflict between people and cars. Research shows that the leg injury of pedestrians accounts for the highest proportion in car-pedestrian collisions. The front bumper is the first contact point with the pedestrian's leg, and the pedestrian's leg usually suffers different forms of injury such as fracture, ligament injury and knee injury. Severe cases require amputation, which greatly inconveniences the life of pedestrians and reduces the quality of life. Therefore, it is necessary to design a pedestrian-friendly front bumper structure or system.

[0003] In addition, the high-value components such as the low beam, fog lamp and sensor are usually connected around the crash beam. After a collision, the high-value components are easily extruded by the crash beam, resulting in plastic deformation and causing the high-value components to be scrapped, which increases the maintenance cost. Therefore, a front bumper system needs to be designed, which has an energy absorption module to achieve energy absorption, avoid direct collision with high-value components, and protect high-value components.

[0004] For pedestrian leg protection, CN112758034B proposes a leg protection structure containing a rubber buffer elastic element. After the front bumper is deformed by the collided pedestrian, the buffer elastic element can push the pedestrian's calf back, achieving the purpose of reducing leg bending deformation and ligament stretch. In CN109278688B, a front bumper anti-sinking structure for pedestrian protection is proposed. The cross beam between the anti-sinking supports can provide support, reducing the damage to the knee of the pedestrian. CN108501858B designs a pedestrian calf protection device from the perspective of assembly and lightweight. However, these designs do not consider the protection of the front crash beam and high-value components such as the low beam, fog lamp and sensor in low-speed collision conditions, which can easily lead to frequent replacement of the front crash beam and high-value components after a low-speed collision, resulting in increased maintenance costs. CN117125014A provides a low-speed collision protection device for vehicles to improve energy absorption in low-speed collisions and improve passive safety performance. CN115009208A designs a front bumper cross beam that can be telescopic to protect high-value components in low-speed collisions, but these designs do not consider pedestrian leg protection performance.

[0005] The front bumper system needs to have crashworthiness in low-speed collision, which requires high stiffness of the front bumper system, and needs to meet the pedestrian protection performance, which requires low stiffness, so the crashworthiness and pedestrian protection performance of the front bumper are paradoxical, and it is extremely challenging to consider both. CN101844550B proposes a car bumper with two energy absorption modes, but it does not consider the low-speed crashworthiness when the car hits a cylindrical rigid structure (such as a fire hydrant on urban roads), and cannot accurately distinguish between low-speed collision and pedestrian protection performance working conditions, so there is still a high risk of damage to high-value components in low-speed collisions. The existing research mainly adopts a compromise method to consider crashworthiness and pedestrian protection performance, that is, after ensuring low-speed crashworthiness, the front end energy absorption module of the front bumper is optimized in structure, so as to achieve the balanced effect of crashworthiness and pedestrian protection performance. But this method has the limitation that the crashworthiness and pedestrian protection effect cannot be maximized at the same time or the performance of the two performances cannot reach the expected performance. Therefore, an intelligent front bumper system capable of distinguishing different working conditions is needed to decouple the crashworthiness and pedestrian protection performance to achieve the requirements of low-risk damage to high-value components and high pedestrian protection performance. SUMMARY

[0006] To meet the requirements of crashworthiness in low-speed collision and pedestrian leg protection, the present application designs an intelligent front bumper system that decouples crashworthiness and pedestrian protection performance.

[0007] The front bumper intelligent system is composed of an intelligent monitoring device, an energy absorption module and an intelligent actuator; the intelligent monitoring device is composed of a laser radar, a binocular camera, a visual algorithm system and a sensor, and is arranged on the roof of the automobile; the energy absorption module is sequentially composed of a front bumper skin, a recyclable empty pop can, a pop can fixing plate, a negative Poisson's ratio expansion structure, a sleeve and a front anti-collision cross beam from left to right; the recyclable empty pop can is clamped in the large through hole of the pop can fixing plate; the pop can fixing plate is fixed on the front anti-collision cross beam by bolts; a plurality of small through holes are formed in the front anti-collision cross beam, and an internally threaded mounting seat is arranged outside the small through holes; the negative Poisson's ratio expansion structure is arranged between the recyclable empty pop can and the internally threaded mounting seat; the fixed base and the slender rod of the negative Poisson's ratio expansion structure are respectively provided with external threads and internal threads; the fixed base of the negative Poisson's ratio expansion structure is connected with the internally threaded mounting seat of the front anti-collision cross beam by threads; a locking block containing groove is formed in the slender rod of the negative Poisson's ratio expansion structure, and a spring and a locking block are arranged in the locking block containing groove; an internally threaded hole is formed below the fixed base of the negative Poisson's ratio expansion structure, and is connected with the sleeve; the intelligent actuator is composed of a double-headed stud, a transmission mechanism and a motor; one end of the double-headed stud in the intelligent actuator is connected with the slender rod of the negative Poisson's ratio expansion structure, and the other end is connected with the transmission mechanism for converting rotary motion into linear motion; the rotor of the motor is connected with the transmission mechanism; the intelligent actuator is arranged between the cooling system of the automobile and the front anti-collision cross beam.

[0008] Further, the diameter of the negative Poisson's ratio expansion structure hole is smaller than the diameter of the large through hole of the pop can fixing plate; secondly, the sleeve is used for pre-tightening and guiding the locking block; when the expansion structure is expanded, the locking block slides along the inner wall of the sleeve under the combined action of spring compression and sleeve extrusion; after expansion, the locking block is clamped into the locking groove under the action of the spring elastic potential, so as to form self-locking and make the expansion structure bear the impact force by itself.

[0009] Further, the layout mode of the pop can fixing plate has diversity and strong design adaptability; according to the pedestrian leg collision area, the layout mode of the pop can fixing plate can be divided into a triangular shape, a square shape, a diagonal line shape and a straight line shape; the layout mode of the pop can fixing plate and the number of recyclable empty pop cans can be individually designed according to the vehicle width.

[0010] Further, the laser radar in the intelligent monitoring device is used to judge whether the collision is unavoidable; the binocular camera is used to shoot the front obstacle; the visual algorithm system is used to judge whether the obstacle is a non-human body; the sensor is used to collect information and transmit it to the intelligent actuator.

[0011] Further, the double-headed screw rod, transmission mechanism and motor in the intelligent actuator are arranged between the automobile cooling system and the front anti-collision cross beam, not only the space is fully utilized, but also the safety and intelligence effects are realized.

[0012] Further, the motor rotor is connected with one end of the transmission mechanism, the double-headed screw rod is connected with the other end of the transmission mechanism, the transmission mechanism converts the rotary motion of the motor rotor into linear motion, and then pushes the negative Poisson's ratio inflation structure to be inflated, the inflated negative Poisson's ratio inflation structure supports the thin wall of the recyclable empty pop can around to form a "high rigidity" structure, and realizes low risk damage of high value components in the automobile low speed collision scene, on the contrary, when the negative Poisson's ratio inflation structure is not inflated, only the recyclable empty pop can forms a "low rigidity" structure, and realizes high pedestrian leg protection effect in the pedestrian-vehicle collision scene.

[0013] Further, the front anti-collision cross beam and the mounting seat are integrated structures, the mounting seat can realize positioning and fixing of the negative Poisson's ratio inflation structure, and ensure smooth inflation of the negative Poisson's ratio inflation structure.

[0014] Further, each independent negative Poisson's ratio inflation structure has four inclined support frames and one support cylinder, the inclined support frames assist the inflation of the inflation structure, and the support cylinder can resist the front end of the pop can after the inflation structure is inflated, and is used for further energy absorption.

[0015] Further, the negative Poisson's ratio inflation structure is manufactured by using the additive manufacturing technology and PA11 material, and the double-headed screw rod is made of stainless steel material.

[0016] Compared with the prior art, the beneficial effects of the present application are as follows:

[0017] The front bumper intelligent system designed in the present application can realize decoupling of crashworthiness and pedestrian protection performance, so as to achieve the requirements of low risk damage of high value components and high pedestrian protection performance, overcome the design problems that the automobile low speed collision crashworthiness and the pedestrian protection effect are contradictory and the two performance effects cannot reach the expected standard, secondly, the design concept of green, environmental protection and safety is faced, the waste recycling of empty pop cans is achieved, and the effects of lightweight and energy saving and emission reduction are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below, and obviously, the drawings in the following description can only be some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 is a structural schematic diagram of the present application;

[0020] Figure 2 is an exploded view of the present application;

[0021] Figure 3 is a negative Poisson's ratio expansion structure schematic diagram of the present application;

[0022] Figure 4 is a sleeve structure schematic diagram of the present application;

[0023] Figure 5 is a front anti-collision cross beam structure schematic diagram of the present application;

[0024] Figure 6 is a double-headed stud structure schematic diagram of the present application;

[0025] Figure 7 is a layout mode schematic diagram of the present application of the zip-top can fixing plate;

[0026] Figure 8 is a three-dimensional model schematic diagram of the present application of the zip-top can collision cross beam;

[0027] Figure 9 is a working state schematic diagram of the present application of the front bumper intelligent system under low-speed collision working condition;

[0028] Among them, the corresponding reference signs are:

[0029] 10-bolt;

[0030] 20-double-headed stud;

[0031] 30-front anti-collision cross beam, 301-small through hole, 302-mounting seat;

[0032] 40-zip-top can fixing plate, 401-large through hole;

[0033] 50-negative Poisson's ratio expansion structure, 501-elongated rod, 502-fixed base, 503-oblique support frame, 504-supporting cylinder, 505-locking block containing groove, 506-locking groove;

[0034] 60-sleeve;

[0035] 70-locking block;

[0036] 80-recyclable empty zip-top can.

[0037] Among them, Figure 2 is an exploded schematic diagram of the maximum number of zip-top cans and the negative Poisson's ratio expansion structure.

[0038] Among them, Figure 6The layout mode of the pop can fixing plate in the pop can fixing plate is one of four typical layout modes of a triangle, a square, a diagonal line and a straight line. DETAILED DESCRIPTION

[0039] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without using some or all of these specific details, and that the present application is not limited to the specific embodiments disclosed below.

[0040] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0041] In addition, the terms "first", "second", "third" and the like are used only for descriptive purposes and should not be construed as indicating or implying relative importance or a specific number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0042] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "over", "above" and "on top of" a second feature can be directly above or obliquely above the second feature, or simply means that the first feature is higher in horizontal level than the second feature. A first feature "under", "below" and "underneath" a second feature can be directly below or obliquely below the second feature, or simply means that the first feature is lower in horizontal level than the second feature.

[0044] It should be noted that when an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or there can be an intermediate element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0045] Embodiment 1

[0046] A front bumper intelligent system decoupling crashworthiness and pedestrian protection performance:

[0047] Reference Figures 1 to 9 , the front bumper intelligent system in the embodiment is composed of an intelligent monitoring device, an energy absorption module, and an intelligent actuator; the intelligent monitoring device is composed of a laser radar, a binocular camera, a visual algorithm system, and a sensor, and is arranged on the roof of the automobile; the energy absorption module is composed of a front bumper skin, a recyclable empty easy-open can 80, an easy-open can fixing plate 40, a negative Poisson's ratio expansion structure 50, a sleeve 60, and a front anti-collision cross beam 30 from left to right; the recyclable empty easy-open can is a common easy-open can for cola, Sprite, etc., and is cut off from the bottom to the top by a wire cutting or laser cutting method with a length of 80 mm; reference Figure 5 , the front anti-collision cross beam 30 has lengths of 40 mm, 1175 mm, and 135 mm in X, Y, and Z directions respectively, and the corresponding easy-open can fixing plate 40 has lengths of 1 mm, 1175 mm, and 145 mm in X, Y, and Z directions respectively; reference Figure 3 , the expansion part of the negative Poisson's ratio expansion structure 50 has lengths of 40 mm in X, Y, and Z directions, and the slender rod 501 of the negative Poisson's ratio expansion structure 50 has lengths of 40 mm, 15 mm, and 15 mm in X, Y, and Z directions respectively, and the lengths of the negative Poisson's ratio expansion structure in X, Y, and Z directions after expansion are just filled with the empty easy-open can, and the recyclable empty easy-open can 80 is clamped in the large through hole 401 of the easy-open can fixing plate 40, referenceFigure 7 The square layout of the can fixing plate 40 is fixed on the front anti-collision cross beam 30 by the bolt 10, the front anti-collision cross beam 30 is provided with a plurality of small through holes 301, the small through holes 301 are externally provided with internally threaded mounting seats 302, the negative Poisson's ratio inflatable structure 50 is arranged between the recyclable empty can 80 and the internally threaded mounting seat 302, the fixed base 502 and the elongated rod 501 of the negative Poisson's ratio inflatable structure 50 are respectively provided with external threads and internal threads, the fixed base 502 of the negative Poisson's ratio inflatable structure 50 is threadedly connected with the mounting seat 302 of the front anti-collision cross beam 30, the elongated rod 501 of the negative Poisson's ratio inflatable structure 50 is provided with a locking block containing groove 505, and the locking block containing groove 505 is internally provided with a spring and a locking block 70; the intelligent actuator is composed of a stud bolt 20, a transmission mechanism and a motor, one end of the stud bolt 20 in the intelligent actuator is connected with the elongated rod 501 of the negative Poisson's ratio inflatable structure 50, the other end of the stud bolt 20 is connected with the transmission mechanism for converting the rotary motion into the linear motion, the rotor of the motor is connected with the transmission mechanism, and the intelligent actuator is arranged between the automobile cooling system and the front anti-collision cross beam 30.

[0048] Working principle: the front bumper intelligent system for decoupling crashworthiness and pedestrian protection is provided on a certain vehicle model, firstly, the binocular camera is used to shoot the front obstacle, and the visual algorithm system is used to judge whether the obstacle is a non-human body, if the laser radar in the intelligent monitoring device judges that the collision is inevitable, the sensor collects information and transmits it to the intelligent actuator, when it is judged that the front obstacle is a non-human body, the motor rotor starts to move, the transmission mechanism converts the rotary motion of the motor rotor into the linear motion, through the connection of the stud bolt 20, the negative Poisson's ratio inflatable structure 50 is expanded, after the expansion, the negative Poisson's ratio inflatable structure 50 supports the thin wall of the recyclable empty can 80 to form a "high rigidity" structure, realizing the function of low risk damage of high value components in the low speed collision scene of the automobile, on the contrary, when it is judged that the front obstacle is a person, the negative Poisson's ratio inflatable structure 50 is not expanded, only relying on the recyclable empty can 80 to form a "low rigidity" structure, realizing the function of high pedestrian leg protection effect in the human-vehicle collision scene.

[0049] The technical features of the above-mentioned embodiments can be combined arbitrarily, in order to make the description simple, not all possible combinations of the technical features in the above-mentioned embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0050] The above-described embodiments are merely illustrative of one embodiment of the present application, which is described in more detail and in a more specific and detailed manner, but should not be construed as limiting the scope of the patent application. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these are all within the scope of the present application. Therefore, the scope of the patent protection of the present application should be subject to the appended claims.

Claims

1. A front bumper intelligent system that decouples crashworthiness and pedestrian protection performance, characterized in that, include: The intelligent monitoring device consists of a lidar, a binocular camera, a visual algorithm system, and sensors, and is placed on the roof of a car. The energy-absorbing module, from left to right, consists of a front bumper skin, a recyclable empty aluminum can, an aluminum can fixing plate, a negative Poisson's ratio expansion structure, a sleeve, and a front anti-collision beam. The recyclable empty aluminum can is secured in a large through hole in the aluminum can fixing plate, which is bolted to the front anti-collision beam. The front anti-collision beam has several small through holes, each with an internally threaded mounting seat. The negative Poisson's ratio expansion structure is placed between the recyclable empty aluminum can and the internally threaded mounting seat. The fixing base and slender rod of the negative Poisson's ratio expansion structure are respectively provided with external and internal threads. The fixing base of the negative Poisson's ratio expansion structure is threadedly connected to the internally threaded mounting seat of the front anti-collision beam. The slender rod of the negative Poisson's ratio expansion structure has a locking block receiving groove, which contains a spring and a locking block. The fixing base of the expansion structure has an internally threaded hole at its bottom, which connects to the sleeve. The intelligent actuator consists of a double-ended stud, a transmission mechanism, and a motor. One end of the double-ended stud is connected to the slender rod of the negative Poisson's ratio expansion structure, and the other end is connected to the transmission mechanism. The rotor of the motor is connected to the transmission mechanism. The intelligent actuator is placed between the vehicle cooling system and the front anti-collision beam. When the negative Poisson's ratio expansion structure expands, it supports the thin walls around the recyclable empty can to form a "high-rigidity" structure; conversely, when the negative Poisson's ratio expansion structure does not expand, it relies solely on the recyclable empty can to form a "low-rigidity" structure.

2. The intelligent front bumper system for decoupling crashworthiness and pedestrian protection performance according to claim 1, characterized in that, The layout of the can fixing plate is diverse, and it can be divided into triangles, squares, diagonal shapes, and straight lines according to the collision area of ​​the pedestrian's legs. The layout of the can fixing plate and the number of recyclable empty cans can be customized according to the width of the car.

3. The intelligent front bumper system for decoupling crashworthiness and pedestrian protection performance according to claim 1, characterized in that, The diameter of the hole in the negative Poisson's ratio expansion structure is smaller than the diameter of the large through hole in the can fixing plate. During the expansion of the negative Poisson's ratio expansion structure, the locking block slides along the inner wall of the sleeve. After expansion, the locking block is engaged in the locking groove to form a self-locking mechanism.

4. The intelligent front bumper system for decoupling crashworthiness and pedestrian protection performance according to claim 1, characterized in that, The front anti-collision beam and the mounting base are an integrated structure.

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