A front bumper intelligent system decoupling crashworthiness and pedestrian protection performance

Abstract

The utility model discloses a kind of front bumper intelligent systems of decoupling crashworthiness and pedestrian protection performance, including intelligent monitoring device, energy absorption module and intelligent actuator, the intelligent monitoring device is composed of laser radar, binocular camera, vision algorithm system and sensor, the energy absorption module is composed of front bumper skin, recyclable empty pop can, pop can fixing plate, negative poisson's ratio dilatancy structure, sleeve and front anti-collision crossbeam, the intelligent actuator is composed of stud, transmission mechanism and motor. The front bumper intelligent system faces green, environmental protection, safe design concept, the waste recycling of empty pop can, reaches the effect of lightweight and energy saving and emission reduction, more importantly, decoupling of crashworthiness and pedestrian protection performance is realized, meet the requirement that high-value element low-risk damage in automobile low-speed collision and high pedestrian protection performance in car collision are simultaneously considered.

Description

Technical Field

[0001] This utility model relates to the field of automotive body technology, and more specifically, to a front bumper intelligent system that decouples crashworthiness and pedestrian protection performance. Background Technology

[0002] The study points out that pedestrian leg injuries account for the highest proportion in pedestrian-vehicle collisions. As the first point of contact with the pedestrian's legs, the front bumper is a common site of injury, with pedestrians often suffering various forms of damage such as fractures, ligament injuries, and knee injuries. In severe cases, amputation may be necessary, which greatly inconveniences pedestrians and reduces their quality of life. Therefore, it is necessary to develop a pedestrian-friendly front bumper structure or system design.

[0003] In addition, the area around the anti-collision beam is usually connected to high-value components such as low beam headlights, fog lights, and sensors. After a collision, these high-value components are easily squeezed by the anti-collision beam, resulting in plastic deformation and scrapping of the high-value components, which increases maintenance costs. Therefore, it is necessary to design a front bumper system with an energy-absorbing module to achieve the effect of energy absorption, avoid direct collision with high-value components, and protect them.

[0004] Regarding pedestrian leg protection, CN112758034B proposes a leg protection structure including a rubber-made cushioning and rebounding elastic element. After a pedestrian is hit and the front bumper deforms, the cushioning and rebounding element can push the pedestrian's lower leg back, thereby reducing leg bending deformation and ligament strain. CN109278688B proposes a front bumper anti-sag structure that is beneficial for pedestrian protection. The crossbeam between the anti-sag brackets can provide support and reduce knee joint damage to pedestrians. CN108501858B designs a pedestrian lower leg protection device from an assembly perspective and with a lightweight design concept. However, these designs do not consider the protection of the front bumper crossbeam and high-value components such as low beam headlights, fog lights, and sensors under low-speed collision conditions. This can easily lead to frequent replacements of the front bumper crossbeam and high-value components after low-speed collisions, resulting in increased maintenance costs. CN117125014A provides a low-speed collision protection device for automobiles to improve energy absorption in low-speed collisions and enhance the passive safety performance of automobiles; CN115009208A, through the design of the front bumper crossbeam, can realize the retractability of the front bumper crossbeam, thereby meeting the protection of high-value components in low-speed collisions, but these designs do not consider the protection performance of pedestrian legs.

[0005] Front bumper systems need to possess crashworthiness in low-speed collisions, requiring high stiffness; conversely, they need to meet pedestrian protection requirements, demanding lower stiffness. Therefore, crashworthiness and pedestrian protection performance are contradictory, making it extremely challenging to balance both. CN101844550B proposes a car bumper with two energy absorption modes, but it doesn't consider low-speed collision performance when a car impacts a cylindrical rigid structure (such as a fire hydrant in urban roads), failing to accurately distinguish between low-speed collision and pedestrian protection conditions. Therefore, there remains a significant risk of damage to high-value components in low-speed collisions. Existing research primarily employs a compromise approach to balance crashworthiness and pedestrian protection performance. This involves optimizing the structure of the front bumper's energy-absorbing module after ensuring low-speed collision performance, thus achieving a balance between the two. However, this method has limitations, as it may not simultaneously maximize crashworthiness and pedestrian protection, or the combined performance may not meet expectations. Therefore, it is necessary to design a front bumper intelligent system that can distinguish between different working conditions, thereby decoupling crashworthiness and pedestrian protection performance, so as to simultaneously meet the requirements of low-risk damage to high-value components and high pedestrian protection performance. Utility Model Content

[0006] To simultaneously meet the requirements of crashworthiness in low-speed collision conditions and pedestrian leg protection, this invention designs a front bumper intelligent system that decouples crashworthiness and pedestrian protection performance.

[0007] The front bumper intelligent system comprises an intelligent monitoring device, an energy-absorbing module, and an intelligent actuator. The intelligent monitoring device consists of a lidar, a binocular camera, a visual algorithm system, and sensors, and is mounted on the roof of the vehicle. The energy-absorbing module, from left to right, consists of a front bumper skin, a recyclable empty aluminum can, a can mounting 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 can mounting 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 positioned between the recyclable empty aluminum can and the internally threaded mounting seat. The fixed base and slender rod of the negative Poisson's ratio expansion structure are respectively provided with external and internal threads. The fixed base of the negative Poisson's ratio expansion structure is threadedly connected to the internal 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, and a spring and a locking block are installed in the locking block receiving groove. The fixed base of the negative Poisson's ratio expansion structure has an internal threaded hole at the bottom, which is connected 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 in the intelligent actuator is connected to the slender rod of the negative Poisson's ratio expansion structure, and the other end is connected to the transmission mechanism that converts rotational motion into linear motion. 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.

[0008] Furthermore, 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. Secondly, the sleeve is used for pre-tightening and guiding the locking block. When the expansion structure expands, 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 locked into the locking groove under the action of spring elastic potential energy, forming a self-locking mechanism, so that the expansion structure itself can withstand the impact force.

[0009] Furthermore, the layout of the can fixing plate is diverse and highly adaptable. It can be divided into triangles, squares, diagonals, and straight lines according to the pedestrian leg collision area. The layout of the can fixing plate and the number of recyclable empty cans can be customized according to the width of the car.

[0010] Furthermore, the lidar in the intelligent monitoring device is used to determine whether a collision is unavoidable, the binocular camera is used to photograph obstacles in front, the visual algorithm system is used to determine whether the obstacle is a non-human object, and the sensor is used to collect information and transmit it to the intelligent actuator.

[0011] Furthermore, the double-headed screw, transmission mechanism, and motor in the intelligent actuator are placed between the vehicle's cooling system and the front anti-collision beam, which not only makes full use of this space but also achieves both safety and intelligence.

[0012] Furthermore, in the intelligent actuator, the motor rotor is connected to one end of the transmission mechanism, and the double-ended stud is connected to the other end of the transmission mechanism. The transmission mechanism converts the rotational motion of the motor rotor into linear motion, thereby pushing the negative Poisson's ratio expansion structure to expand. After expansion, it supports the thin walls of the recyclable empty can to form a "high-rigidity" structure, achieving low-risk damage to high-value components in low-speed car collision scenarios. Conversely, when the negative Poisson's ratio expansion structure does not expand, the recyclable empty can alone forms a "low-rigidity" structure, achieving a high pedestrian leg protection effect in human-vehicle collision scenarios.

[0013] Furthermore, the front anti-collision beam and the mounting base are an integrated structure. The mounting base can realize the positioning and fixation of the negative Poisson's ratio expansion structure, ensuring the smooth expansion of the negative Poisson's ratio expansion structure.

[0014] Furthermore, each of the independent negative Poisson's ratio expansion structures has four inclined support frames and one support cylinder. The inclined support frames assist in the expansion of the expansion structure. After the expansion structure expands, the support cylinder can abut against the front end of the can for further energy absorption.

[0015] Furthermore, the negative Poisson's ratio elastomeric structure is manufactured using additive manufacturing technology and PA11 material, and the double-ended stud is made of stainless steel.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This utility model designs a front bumper intelligent system that decouples crashworthiness and pedestrian protection performance. It can decouple crashworthiness and pedestrian protection performance to achieve the requirement of low-risk damage to high-value components and high pedestrian protection performance at the same time. It overcomes the design problem of the contradiction between crashworthiness and pedestrian protection in low-speed collisions of automobiles and the failure to achieve the expected standard in balancing the two performances. Secondly, it is oriented towards the design concept of green, environmental protection and safety, and recycles empty aluminum cans, achieving the effects of lightweighting and energy saving and emission reduction. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

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

[0021] Figure 3 This is a schematic diagram of the negative Poisson's ratio tautology structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the sleeve structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the front anti-collision beam structure of this utility model;

[0024] Figure 6 This is a schematic diagram of the double-headed stud structure of this utility model;

[0025] Figure 7 This is a schematic diagram of the layout of the can fixing plate of this utility model;

[0026] Figure 8 This is a three-dimensional model diagram of the can impact beam according to the present invention.

[0027] Figure 9 This is a schematic diagram of the working state of the intelligent front bumper system of this utility model under low-speed collision conditions.

[0028] The corresponding reference numerals in the attached figures are:

[0029] 10- Bolts;

[0030] 20-Double-ended stud;

[0031] 30-Front bumper beam, 301-Small through hole, 302-Mounting base;

[0032] 40 - Can fixing plate, 401 - Large through hole;

[0033] 50 - Negative Poisson's ratio expansion structure, 501 - Slender rod, 502 - Fixed base, 503 - Inclined support frame, 504 - Support cylinder, 505 - Locking block receiving groove, 506 - Locking groove;

[0034] 60-sleeve;

[0035] 70-Locking block;

[0036] 80 - Recyclable empty aluminum cans.

[0037] in, Figure 2 An explosive diagram illustrating the maximization of the number of aluminum cans and the negative Poisson's ratio expansion structure.

[0038] in, Figure 6 The layout of the can fixing plate in the picture is only one of the four typical layouts: triangle, square, diagonal and straight. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

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

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

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

[0045] Example 1

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

[0047] refer to Figures 1 to 9 This embodiment is equipped with a front bumper intelligent system that decouples crashworthiness and pedestrian protection performance. This system consists of an intelligent monitoring device, an energy-absorbing module, and an intelligent actuator. The intelligent monitoring device comprises a lidar, a binocular camera, a visual algorithm system, and sensors, and is mounted on the roof of the vehicle. The energy-absorbing module, from left to right, consists of a front bumper skin, a recyclable empty aluminum can 80, an aluminum can fixing plate 40, a negative Poisson's ratio expansion structure 50, a sleeve 60, and a front anti-collision beam 30. The recyclable empty aluminum can is a common can such as a Coca-Cola or Sprite can, cut to an 80mm length from the bottom to the top using wire cutting or laser cutting. Figure 5 The front anti-collision beam 30 has lengths of 40, 1175, and 135 mm in the X, Y, and Z directions, respectively, and the corresponding can fixing plate 40 has lengths of 1, 1175, and 145 mm in the X, Y, and Z directions, respectively; Reference Figure 3 The expanded portion of the negative Poisson's ratio expansion structure 50 has a length of 40mm in the X, Y, and Z directions. The slender rod 501 of the negative Poisson's ratio expansion structure 50 has lengths of 40, 15, and 15mm in the X, Y, and Z directions, respectively. When the negative Poisson's ratio expansion structure expands, its length in the X, Y, and Z directions exactly fills the empty aluminum can. The recyclable empty aluminum can 80 is secured in the large through hole 401 of the aluminum can fixing plate 40. (Reference) Figure 7 The can fixing plate 40 is arranged in a square layout. The can fixing plate 40 is fixed to the front anti-collision beam 30 with bolts 10. The front anti-collision beam 30 has several small through holes 301, and internally threaded mounting seats 302 are provided on the outside of the small through holes 301. The negative Poisson's ratio expansion structure 50 is placed inside the body of the recyclable empty can 80 and between the internally threaded mounting seat 302. The fixing base 502 and the slender rod 501 of the negative Poisson's ratio expansion structure 50 are respectively provided with external and internal threads. The fixing base 502 of the negative Poisson's ratio expansion structure 50 and the front anti-collision beam 30... The mounting base 302 is threaded. The slender rod 501 of the negative Poisson's ratio expansion structure 50 has a locking block receiving groove 505, which contains a spring and a locking block 70. The intelligent actuator consists of a double-ended stud 20, a transmission mechanism, and a motor. One end of the double-ended stud 20 in the intelligent actuator is connected to the slender rod 501 of the negative Poisson's ratio expansion structure 50, and the other end is connected to the transmission mechanism that converts rotational motion into linear motion. 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 30.

[0048] Working Principle: A certain vehicle model is equipped with the aforementioned intelligent front bumper system for decoupling crashworthiness and pedestrian protection. First, a dual-lens camera is used to photograph obstacles in front, and a visual algorithm system determines whether the obstacle is a non-human object. If the lidar in the intelligent monitoring device determines that a collision is unavoidable, the sensor collects information and transmits it to the intelligent actuator. When the obstacle in front is determined to be a non-human object, the motor rotor begins to move. The transmission mechanism converts the rotational motion of the motor rotor into linear motion. Through the connection of the double-ended studs 20, the negative Poisson's ratio expansion structure 50 is pushed to expand. After expansion, the negative Poisson's ratio expansion structure 50 supports the thin walls of the recyclable empty can 80 to form a "high-rigidity" structure, achieving the function of low-risk damage to high-value components in low-speed vehicle collision scenarios. Conversely, when the obstacle in front is determined to be a human, the negative Poisson's ratio expansion structure 50 does not expand, and only the recyclable empty can 80 forms a "low-rigidity" structure, achieving the function of high pedestrian leg protection in human-vehicle collision scenarios.

[0049] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The embodiments described above are merely one implementation method of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by 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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