Automobile bumper beam assembly structure, automobile and collision energy absorption method

Abstract

The invention discloses an automobile bumper beam assembly structure, an automobile and a collision energy absorption method. The automobile bumper beam assembly structure comprises a lightweight bumper beam main body, an active telescopic energy absorption box and a connecting plate, the upper ends of the pair of active telescopic energy absorption boxes are symmetrically fixed to the lower end faces of the left side and the right side of the light bumper beam body. The lower end of each active telescopic energy absorption box is fixedly connected with a connecting plate; the pair of active telescopic energy absorption boxes can drive the lightweight bumper beam main body to synchronously stretch and retract relative to the connecting plate; the bumper cross beam body is made of light-weight materials, the energy absorption box integrates the active telescopic function at the same time, the distance between the bumper and an anti-collision beam can be adjusted when low-speed collision occurs, and the bumper cross beam has the advantages of being simple in overall structure, high in strength, capable of protecting pedestrians, capable of saving machining and maintenance cost and the like.

Description

Technical Field

[0001] The invention relates to the technical field of automobile accessories, and in particular to an automobile bumper beam assembly structure, an automobile and a collision energy absorption method. Background Art

[0002] Hyundai cars are equipped with a bumper beam assembly at the front end of the engine compartment as a passive safety protection part; the components in the bumper beam assembly are all stamped from steel plates and then formed into a bumper beam assembly; in order to ensure that the bumper beam body has strong strength and rigidity, the body is usually designed to be a high-strength steel plate or a hot-formed steel plate or an aluminum alloy material and a thicker material thickness is required to achieve its performance requirements; while protecting the safety of the occupants in the passenger compartment, it will cause certain harm to pedestrians; the distance between the bumper and the anti-collision beam is determined according to the vehicle's safety design and collision test standards to ensure that the safety of passengers can be protected to the maximum extent and vehicle damage can be reduced in the event of a collision; pedestrians are a vulnerable group among road users, and the collision between pedestrians and vehicles is characterized by a high mortality rate, a high serious injury rate and a high disability rate for pedestrians; although the high-strength anti-collision beam is conducive to the transmission and absorption of collision energy, it is also the number one killer that causes harm to pedestrians. Summary of the invention

[0003] In order to solve the above problems, the present invention provides an automobile bumper beam assembly structure. The bumper beam main body is made of lightweight materials, and the energy absorption box is also integrated with an active telescopic function, which can adjust the distance between the bumper and the anti-collision beam when a low-speed collision occurs. It has the advantages of simple overall structure, high strength, protection of pedestrians, and saving of processing and maintenance costs.

[0004] The present invention provides an automobile bumper beam assembly structure, comprising a lightweight bumper beam body, an active telescopic energy absorption box and a connecting plate;

[0005] The upper ends of a pair of active telescopic energy absorbing boxes are symmetrically fixed to the lower end surfaces of the left and right sides of the lightweight bumper beam body; the lower end of each active telescopic energy absorbing box is fixedly connected to a connecting plate. The active telescopic energy absorbing box adjusts the amount of oil in the cylinder body to meet the requirements of different forms of collision. The active telescopic energy absorbing box also further absorbs the collision energy through its own cross section and outer surface structure;

[0006] A pair of active telescopic energy absorption boxes can drive the main body of the lightweight bumper beam to synchronously extend and retract relative to the connecting plate; the main body of the lightweight bumper beam is used to protect the assembly behind the beam and the passenger space on the vehicle side in the event of a collision, especially a head-on collision. The active telescopic energy absorption box is connected to the beam as an energy absorbing component, and the rear end surface of the connecting plate can be screwed and fixed to the main beam of the vehicle. The active telescopic energy absorption box can automatically adjust its displacement before crushing and deformation, driving the main body of the lightweight bumper beam to move synchronously to meet the needs of different forms of collision, thereby reducing the damage to pedestrians caused by low-speed collisions; the active telescopic energy absorption box can more effectively disperse the impact force in high-speed collisions, reduce damage to the vehicle structure, and thus reduce maintenance costs.

[0007] Each active telescopic energy absorption box includes a cylinder body and a piston rod; the piston rod is slidably sleeved in the cylinder body, and the free end of the piston rod is detachably fixed to the end of the lightweight bumper beam body in the opposite position through a U-shaped connecting arm fixed to the free end; the piston rod divides the cylinder body into a rod chamber and a rodless chamber, and the upper side wall of the rod chamber and the lower side wall of the rodless chamber are respectively provided with oil inlet and outlet a and oil inlet and outlet b, and the oil inlet and outlet a and the oil inlet and outlet b can be connected to the oil storage tank with an oil pump on the car through pipelines, so that oil can be injected or extracted into the rod chamber and the rodless chamber through pipelines according to the state of collision during low-speed driving or high-speed driving, so as to realize bidirectional movement of the piston rod, so that the lightweight bumper beam body can reduce the damage to pedestrians during low-speed collision or complete the collision energy absorption of the lightweight bumper beam body and the collision energy absorption of the energy absorption box during high-speed collision, which can more effectively disperse the impact force, reduce damage to the vehicle structure, and thus reduce maintenance costs.

[0008] The cross section of the cylinder body of each active telescopic energy absorbing box is a square outside and a round inside structure, so that the energy absorbing box maintains a certain strength against compression deformation.

[0009] A number of crush guide ribs are symmetrically and evenly arranged on the four edges of the outer surface of the cylinder body of each active telescopic energy absorption box cylinder. When the car collides with other vehicles at high speed, the collision sensor sends a signal to the central controller within a very short time after the collision occurs. The front bumper beam and the energy absorption box structure are crushed, and the end of the energy absorption box piston rod moves backward. When the oil space is compressed to the limit and still cannot meet the energy absorption space, the central controller sends a command to open the oil inlet and outlet a to discharge excess oil. The energy absorption box's own structure is naturally crushed under the guidance of the crush guide ribs to achieve more collision energy absorption.

[0010] The main body of the lightweight bumper beam is a hollow tubular cavity structure; the main body of the lightweight bumper beam is made of aluminum alloy, or other high-strength lightweight materials, which is conducive to reducing the weight of the parts.

[0011] The lightweight bumper beam body is a hollow multi-tubular cavity structure, and its cross-section is in the shape of "日" (Chinese character), "目" (Chinese character), or "田" (Chinese character) to further enhance the compressive deformation strength of the front and rear end walls of the lightweight bumper beam body in the X direction (vehicle body length direction).

[0012] A vehicle includes a front main beam and also includes the above-mentioned vehicle bumper beam assembly structure. The vehicle bumper beam assembly structure is fixed to the front end face of the front main beam. The connection forms between the active telescopic energy-absorbing box, the connecting plate, and the front main beam are welding, chemical bonding, or screw connection.

[0013] A vehicle also includes a pressure tube type pedestrian collision detection sensor, an oil storage tank with an oil pump, a vehicle computer, and a collision sensor. The pressure tube type pedestrian collision detection sensor is arranged on the front end face of the lightweight bumper beam body through the transverse dimension. The pressure tube type pedestrian collision detection sensor and the collision sensor are respectively electrically connected to the vehicle computer. The vehicle computer is electrically connected to the oil pump of the oil storage tank. The collision sensor is arranged at the front part of the vehicle body sheet metal. The oil pump on the oil storage tank is respectively connected to the oil inlet / outlet a and the oil inlet / outlet b through pipelines. Most of the collision sensors adopt an inertial mechanical switch structure, which is equivalent to a control switch, and its working state depends on the magnitude of the acceleration during vehicle collision.

[0014] A collision energy absorption method includes an energy absorption method for the bumper beam assembly structure in the pedestrian collision protection mode:

[0015] When the vehicle is in the starting state and maintains the speed limit on urban roads, a certain volume of oil is injected into the rodless cavity of the active telescopic energy-absorbing box. At the same time, an oil-free space V is reserved in the rodless cavity, and the oil inlet / outlet b is closed.

[0016] When the pressure tube type pedestrian collision detection sensor identifies a collision with a pedestrian, for the active scheme sensing time ST, the vehicle computer controls the oil pump to quickly inject oil from the oil inlet / outlet a. The left and right piston rods drive the lightweight bumper beam body to move backward by a certain displacement L1. For the mechanism execution time DT, more collision buffer zones are provided for the pedestrian within the collision time TTC and the contact beam time HIT, reducing the injury to the pedestrian's leg area during the collision.

[0017] The active scheme sensing time ST + the mechanism execution time DT < the collision time TTC + the contact beam time HIT;

[0018] After the collision ends, the vehicle computer can command the oil pump to re-inject a certain volume of oil into the rodless cavity from the oil inlet / outlet b. At the same time, the vehicle computer commands the oil pump to evacuate the oil injected into the rodless cavity from the oil inlet / outlet a, so that the lightweight bumper beam body returns to its initial position.

[0019] A collision energy absorption method includes an energy absorption method for the bumper beam assembly structure in the vehicle and occupant space protection mode:

[0020] When the vehicle's driving speed exceeds the speed limit of urban roads, the pedestrian protection sensor will be disabled. When the vehicle collides with other objects at a low speed, the collision sensor detects the intensity signal of the vehicle collision, detects the inertia force under the extremely large deceleration when the vehicle collides, and inputs the signal into the driving computer. The driving computer determines the position of the active telescopic energy absorption box according to the signal of the collision sensor and drives the oil pump to inject more oil into the inlet and outlet port b to fill the V space and then close it. The collision impact force is transmitted from the lightweight bumper beam body to the piston rod of the active telescopic energy absorption box, which compresses the oil space to generate resistance to achieve buffering and energy absorption, reduce damage to the front main beam and longitudinal beam and other structural parts of the vehicle, and reduce the injury to the driver and passengers in the passenger compartment;

[0021] After the collision, the main body of the lightweight bumper beam will be crushed and deformed, but the main body of the active telescopic energy absorbing box will not be damaged. By removing the bolts between the active telescopic energy absorbing box and the main body of the lightweight bumper beam, a new lightweight bumper beam main body can be replaced to reduce maintenance costs;

[0022] Alternatively, when the car's driving speed exceeds the speed limit of urban roads, the pedestrian protection sensor will be disabled. When the car collides with other vehicles at high speed, the collision sensor sends a signal to the on-board computer within a very short time after the collision occurs. The lightweight bumper beam body and the active telescopic energy absorption box structure are crushed, and the piston rod end of the active telescopic energy absorption box moves backward. The oil space is compressed to the limit but still cannot meet the energy absorption space. The on-board computer sends a command to control the oil pump to discharge excess oil in the inlet and outlet b. The active telescopic energy absorption box is naturally crushed under the guidance of several crush guide ribs to absorb more collision energy. At the same time, the on-board computer determines whether to detonate the inflatable element to inflate the airbag and other passive safety measures of the car based on the signal of the collision sensor to reduce damage to the cockpit occupants.

[0023] Beneficial Effects

[0024] The bumper beam body of the present invention is made of lightweight material, and the energy absorption box is integrated with an active telescopic function, which can adjust the distance between the bumper and the anti-collision beam when a low-speed collision occurs. It has the advantages of simple overall structure, high strength, protection of pedestrians, and saving of processing and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 It is a schematic diagram of a partially enlarged structure of the present invention.

[0027] Figure 3 yes Figure 2 Schematic diagram of the AA cross-section structure.

[0028] Figure 4 yes Figure 2 Schematic diagram of the BB cross-section structure.

[0029] Figure 5 yes Figure 2 Schematic diagram of the CC cross-section structure.

[0030] Figure 6 yes Figure 2 Schematic diagram of the DD cross-section structure.

[0031] Figure 7 This is a schematic diagram of the working principle structure of the present invention Figure 1 .

[0032] Figure 8 This is a schematic diagram of the working principle structure of the present invention Figure 2 .

[0033] Fig. 9 This is a schematic diagram of the working principle structure of the present invention Figure 3 .

[0034] In the figure:

[0035] 1. Lightweight bumper beam body;

[0036] 2. Active telescopic energy absorption box; 21. Cylinder body; 211. Rod chamber; 2111. Oil inlet and outlet a; 212. Rodless chamber; 2121. Oil inlet and outlet b; 213. Compression guide rib; 22. Piston rod; 23. U-shaped connecting arm;

[0037] 3. Connecting plate. DETAILED DESCRIPTION

[0038] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, not all.

[0039] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Example 1

[0042] See also Figure 1-Figure 6 As shown, an automobile bumper beam assembly structure includes a lightweight bumper beam body 1, an active telescopic energy absorption box 2 and a connecting plate 3;

[0043] The upper ends of a pair of active telescopic energy absorbing boxes 2 are symmetrically fixed to the lower end surfaces of the left and right sides of the lightweight bumper beam body 1; the lower end of each active telescopic energy absorbing box 2 is fixedly connected to a connecting plate 3;

[0044] A pair of active telescopic energy absorbing boxes 2 can drive the lightweight bumper beam body 1 to synchronously telescope relative to the connecting plate 3 .

[0045] Each active telescopic energy absorption box 2 includes a cylinder body 21 and a piston rod 22; the piston rod 22 is slidably sleeved in the cylinder body 21, and the free end of the piston rod 22 is detachably fixed to the end of the lightweight bumper beam body 1 in the corresponding position through a U-shaped connecting arm 23 fixed to the free end; the piston rod 22 divides the cylinder body 21 into a rod chamber 211 and a rodless chamber 212, and the upper side wall of the rod chamber 211 and the lower side wall of the rodless chamber 212 are respectively provided with oil inlet and outlet a2111 and oil inlet and outlet b2121.

[0046] The cross section of the cylinder body 21 of each active telescopic energy absorbing box 2 is a square outer and circular inner structure.

[0047] Sixteen crushing guide ribs 213 are symmetrically and evenly arranged on the four edges of the outer surface of the cylinder body 21 of each active telescopic energy absorbing box 2.

[0048] The lightweight bumper beam body 1 is a hollow tubular cavity structure; the material of the lightweight bumper beam body 1 is aluminum alloy material.

[0049] The lightweight bumper beam body 1 is a hollow multi-tubular cavity structure, and its cross-section is in the shape of a "day" character structure.

[0050] Embodiment 2

[0051] A vehicle includes a front main beam, and also includes the above-mentioned vehicle bumper beam assembly structure. The vehicle bumper beam assembly structure is fixed to the front end face of the front main beam. The connection forms between the active telescopic energy absorption box 2, the connecting plate 3 and the front main beam are all welding.

[0052] A vehicle further includes a pressure tube type pedestrian collision detection sensor, an oil storage tank with an oil pump, a vehicle computer and a collision sensor. The front end face of the lightweight bumper beam body 1 running through the transverse dimension is provided with a pressure tube type pedestrian collision detection sensor. The pressure tube type pedestrian collision detection sensor and the collision sensor are respectively electrically connected to the vehicle computer. The vehicle computer is electrically connected to the oil pump of the oil storage tank. The collision sensor is arranged at the front part of the vehicle head sheet metal. The oil pump on the oil storage tank is respectively communicated with the oil inlet and outlet a2111 and the oil inlet and outlet b2121 through pipelines.

[0053] Embodiment 3

[0054] See Figure 1-Figure 8 As shown, a collision energy absorption method includes an energy absorption method for the bumper beam assembly structure in the pedestrian collision protection mode:

[0055] When the vehicle is in the starting state and maintaining the urban road speed limit, a certain volume of oil is injected into the rodless cavity 212 of the active telescopic energy absorption box 2. At the same time, an oil-free space V is reserved in the rodless cavity 212, and the oil inlet and outlet b2121 is closed;

[0056] When the pressure tube type pedestrian collision detection sensor identifies a pedestrian collision, the active scheme sensing time ST, the vehicle computer controls the oil pump to quickly inject oil from the oil inlet and outlet a2111; the two left and right piston rods 22 drive the lightweight bumper beam body 1 to move backward by a certain displacement L1, and the mechanism execution time DT; within the collision time TTC and the contact beam time HIT, more collision buffer areas are provided for pedestrians to reduce the injury to the pedestrian's leg area during the collision; the active scheme sensing time ST + the mechanism execution time DT < the collision time TTC + the contact beam time HIT;

[0057] After the collision, the on-board computer can instruct the oil pump to re-inject a certain volume of oil into the rodless chamber 212 from the oil inlet and outlet b2121. At the same time, the on-board computer can instruct the oil pump to drain the oil injected into the rod chamber 211 from the oil inlet and outlet a2111, so that the lightweight bumper beam body 1 returns to its initial position.

[0058] Example 4

[0059] See also Figure 1-Figure 9 As shown, a collision energy absorption method includes a vehicle and occupant space protection mode bumper beam assembly structure energy absorption method:

[0060] When the vehicle's driving speed exceeds the speed limit of urban roads, the pedestrian protection sensor will be disabled. When the vehicle collides with other objects at a low speed, the collision sensor detects the intensity signal of the vehicle collision, detects the inertia force under the extremely large deceleration when the vehicle collides, and inputs the signal into the driving computer. The driving computer determines the position of the active telescopic energy absorption box 2 according to the signal of the collision sensor and drives the oil pump to inject more oil into the inlet and outlet oil ports b2121 to fill the V space and then close it. The collision impact force is transmitted from the lightweight bumper beam body 1 to the piston rod 22 of the active telescopic energy absorption box 2, and then the oil space is compressed to generate resistance to achieve buffering energy absorption.

[0061] After the collision, the lightweight bumper beam body 1 will be crushed and deformed, and the main body of the active telescopic energy absorbing box 2 will not be damaged. The new lightweight bumper beam body 1 can be replaced by removing the bolts between the active telescopic energy absorbing box 2 and the lightweight bumper beam body 1;

[0062] Alternatively, when the car's driving speed exceeds the speed limit of urban roads, the pedestrian protection sensor will be disabled. When the car collides with other vehicles at high speed, the collision sensor sends a signal to the on-board computer within a very short time after the collision occurs, and the lightweight bumper beam body 1 and the active telescopic energy absorption box 2 structure are crushed. The end of the piston rod 22 of the active telescopic energy absorption box 2 moves backward. The oil space is compressed to the limit but still cannot meet the energy absorption space. The on-board computer sends an instruction to control the oil pump to discharge excess oil in the inlet and outlet oil ports b2121, and the active telescopic energy absorption box 2 is naturally crushed under the guidance of several crushing guide ribs 213; at the same time, the on-board computer determines whether to detonate the inflatable element to inflate the airbag and other passive safety measures of the car based on the signal of the collision sensor.

[0063] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. An automobile bumper beam assembly structure, characterized in that: It includes a lightweight bumper beam main body (1), an active telescopic energy-absorbing box (2), and a connecting plate (3); The upper ends of a pair of active telescopic energy-absorbing boxes (2) are symmetrically fixed to the lower end faces on the left and right sides of the lightweight bumper beam main body (1); a connecting plate (3) is fixedly connected to the lower end of each active telescopic energy-absorbing box (2); The pair of active telescopic energy-absorbing boxes (2) can drive the lightweight bumper beam main body (1) to synchronously expand and contract relative to the connecting plate (3).

2. The automobile bumper beam assembly structure according to claim 1, characterized in that: Each active telescopic energy-absorbing box (2) includes an oil cylinder body (21) and a piston rod (22); the piston rod (22) is slidably sleeved in the oil cylinder body (21), and the free end of the piston rod (22) is detachably fixed to the end of the corresponding lightweight bumper beam main body (1) through a U-shaped connecting arm (23) fixed to the free end; the piston rod (22) divides the oil cylinder body (21) into a rod chamber (211) and a rodless chamber (212), and an oil inlet / outlet a (2111) and an oil inlet / outlet b (2121) are respectively provided on the upper side wall of the rod chamber (211) and the lower side wall of the rodless chamber (212).

3. The automobile bumper beam assembly structure according to claim 2, characterized in that: The cross-section of the oil cylinder body (21) of each active telescopic energy-absorbing box (2) has a structure of a square outside and a circle inside.

4. The automobile bumper beam assembly structure according to claim 3, characterized in that: A number of crush guiding ribs (213) are symmetrically and evenly arranged on the four edges of the outer surface of the oil cylinder body (21) of each active telescopic energy-absorbing box (2).

5. The automobile bumper beam assembly structure according to claim 4, characterized in that: The lightweight bumper beam main body (1) is a hollow tubular cavity structure; the material of the lightweight bumper beam main body (1) is aluminum alloy material.

6. The automobile bumper beam assembly structure according to claim 5, characterized in that: The lightweight bumper beam main body (1) is a hollow multi-tubular cavity structure, and its cross-section has a structure of "day" shape, "eye" shape or "field" shape.

7. A car, characterized in that: It includes a front main beam, and also includes the automobile bumper beam assembly structure according to any one of claims 1-6. The automobile bumper beam assembly structure is fixed to the front end face of the front main beam. The connection forms between the active telescopic energy-absorbing box (2), the connecting plate (3), and the front main beam are welding, chemical bonding or screwing connection.

8. The automobile according to claim 7, characterized in that: It also includes a pressure tube type pedestrian collision detection sensor, an oil storage tank with an oil pump, a vehicle computer, and a collision sensor. The pressure tube type pedestrian collision detection sensor is arranged on the front end face of the lightweight bumper beam main body (1) running through the transverse dimension. The pressure tube type pedestrian collision detection sensor and the collision sensor are respectively electrically connected to the vehicle computer. The vehicle computer is electrically connected to the oil pump of the oil storage tank. The collision sensor is arranged at the front part of the vehicle body sheet metal. The oil pump on the oil storage tank is respectively connected to the oil inlet / outlet a (2111) and the oil inlet / outlet b (2121) through pipelines.

9. A collision energy absorption method, applied to a vehicle as claimed in claim 8, characterized in that: It includes a method for absorbing energy of a pedestrian collision protection mode bumper beam assembly structure: When the vehicle is in a starting state and maintaining the urban road speed limit, a certain volume of oil is injected into the rodless chamber (212) of the active telescopic energy-absorbing box (2), and at the same time, an oil-free space V is reserved in the rodless chamber (212), and the oil inlet / outlet b (2121) is closed; When the pressure tube pedestrian collision detection sensor identifies a collision pedestrian, the active scheme perception time ST, the driving computer controls the oil pump to quickly inject oil from the oil inlet and outlet a (2111); the left and right piston rods (22) drive the lightweight bumper beam body (1) to move backward a certain displacement L1, and the mechanism execution time DT; within the collision time TTC and the contact beam time HIT, more collision buffer areas are provided for the pedestrian to reduce the damage to the pedestrian's leg area caused by the collision; the active scheme perception time ST + mechanism execution time DT < collision time TTC + contact beam time HIT; After the collision, the on-board computer can instruct the oil pump to inject a certain volume of oil into the rodless cavity (212) from the oil inlet and outlet b (2121), and at the same time, the on-board computer can instruct the oil pump to evacuate the oil injected into the rod cavity (211) from the oil inlet and outlet a (2111), so that the lightweight bumper beam body (1) returns to its initial position.

10. A collision energy absorption method according to claim 9, characterized in that: Including the energy absorption method of the bumper beam assembly structure in the vehicle and occupant space protection mode: When the vehicle's driving speed exceeds the speed limit of the urban road, the pedestrian protection sensor will be disabled. When the vehicle collides with other objects at a low speed, the collision sensor detects the intensity signal of the vehicle collision, detects the inertia force under the extremely large deceleration when the vehicle collides, and inputs the signal into the driving computer. The driving computer determines the position of the active telescopic energy absorption box (2) according to the signal of the collision sensor and drives the oil pump to inject more oil into the inlet and outlet oil ports b (2121) to fill the V space and then close it. The collision impact force is transmitted from the lightweight bumper beam body (1) to the piston rod (22) of the active telescopic energy absorption box (2), and then the oil space is compressed to generate resistance to achieve buffering energy absorption; After the collision, the lightweight bumper beam body (1) will be crushed and deformed, but the main body of the active telescopic energy absorption box (2) will not be damaged. By removing the bolts between the active telescopic energy absorption box (2) and the lightweight bumper beam body (1), a new lightweight bumper beam body (1) can be replaced; Alternatively, when the vehicle's driving speed exceeds the speed limit of the urban road, the pedestrian protection sensor will be disabled. When the vehicle collides with other vehicles at high speed, the collision sensor sends a signal to the on-board computer within a very short time after the collision occurs, and the lightweight bumper beam body (1) and the active telescopic energy absorption box (2) are crushed. The end of the piston rod (22) of the active telescopic energy absorption box (2) moves backward. The oil space is compressed to the limit but still cannot meet the energy absorption space. The on-board computer sends a command to control the oil pump to discharge the excess oil in the inlet and outlet oil ports b (2121). The active telescopic energy absorption box (2) is naturally crushed under the guidance of a number of crushing guide ribs (213); at the same time, the on-board computer determines whether to detonate the inflation element to inflate the airbag and other passive safety measures of the vehicle based on the signal of the collision sensor.

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