Active rear protection device and method for commercial vehicle

Abstract

The invention relates to a commercial vehicle active rear protection device and method.The commercial vehicle active rear protection device comprises a supporting base, an anti-collision beam, a driving mechanism and a control unit, the control unit receives detection results of a vehicle-mounted radar on the speed and distance of a rear vehicle and the height of a bumper, and the control unit judges whether a collision risk exists or not; when a collision risk exists, a signal is sent to the driving mechanism through the control unit, so that the driving mechanism controls the anti-collision beam to slide on the supporting base in the first direction, the anti-collision beam moves to the position lower than the height of a bumper of a rear vehicle, the safety of the rear-end vehicle is guaranteed, the rear vehicle is prevented from entering the bottom of the vehicle, and the safety of the vehicle is guaranteed. And a driver of the small rear vehicle is severely hurt.

Description

Technical Field

[0001] The present application relates to the field of vehicle safety technology, and in particular to an active rear protection device and method for a commercial vehicle. Background Art

[0002] The size and weight of commercial vehicles are larger than those of small cars. In traffic accidents, a small car rear-ending a commercial vehicle is a very dangerous accident, which often causes serious casualties and economic losses. In order to avoid serious casualties and economic losses caused by a small car rear-ending a commercial vehicle, a rear guard is installed at the rear of the commercial vehicle to reduce the damage caused by the collision.

[0003] In the related art, the height of the rear protection device installed on the commercial vehicle is fixed. The force point of some shorter small cars is exactly at the bottom edge of the front windshield, resulting in collision compatibility. It is easy for the small car to drill into the lower part of the commercial vehicle after a collision, causing serious harm to the driver of the small car. Summary of the invention

[0004] Based on this, it is necessary to provide an active rear protection device and method for commercial vehicles in view of the fact that the height of the rear protection devices of existing commercial vehicles is fixed. The force point of some shorter small cars is exactly at the bottom edge of the front windshield, resulting in collision compatibility. It is easy for the small car to drill into the lower part of the commercial vehicle after a collision, causing serious harm to the driver of the small car.

[0005] In a first aspect, an embodiment of the present application provides an active rear protection device for a commercial vehicle, wherein the commercial vehicle is provided with an on-board radar, and the on-board radar is used to detect the speed, distance and bumper height of the rear vehicle, and is characterized in that the active rear protection device for the commercial vehicle comprises:

[0006] A support seat, the support seat is fixed to the rear of the commercial vehicle;

[0007] An anti-collision beam, wherein the anti-collision beam is slidably connected to the support seat along a first direction, wherein the first direction is along a height direction of the commercial vehicle;

[0008] A driving mechanism, wherein the driving mechanism is fixed to the supporting seat;

[0009] A control unit is used to receive the detection result of the vehicle-mounted radar, the control unit is electrically connected to the driving mechanism, and the control unit can control the driving mechanism to drive the anti-collision beam to slide relative to the support seat according to the detection result.

[0010] In one embodiment, the driving mechanism includes a driving member and a transmission assembly, the driving member is fixed to the support seat, and the transmission assembly is in transmission connection with the anti-collision beam;

[0011] The control unit can control the action of the driving member according to the detection result, so that the driving member drives the transmission component to move, so that the transmission component drives the anti-collision beam to slide.

[0012] In one embodiment, the transmission assembly includes a rotating shaft, a first transmission wheel and a second transmission wheel. The rotating shaft is extended along the first direction, one end of the rotating shaft is rotatably connected to the support seat, and the other end is coaxially connected to the first transmission wheel, the output shaft of the driving member is coaxially connected to the second transmission wheel, and the first transmission wheel and the second transmission wheel are meshed for transmission; a sliding seat is fixedly provided on the anti-collision beam, and the sliding seat is threadedly connected to the rotating shaft.

[0013] In one embodiment, the support base includes two fixing frames, a first supporting frame and a second supporting frame, the two fixing frames are extended along the first direction and spaced apart along the second direction, the first supporting frame is extended along the second direction and two ends are fixedly connected to the two fixing frames respectively, the second supporting frame is extended along the second direction and two ends are fixedly connected to the two fixing frames respectively, and the first supporting frame and the second supporting frame are spaced apart along the first direction.

[0014] In one of the embodiments, a slide rail is provided on one side of the support seat close to the anti-collision beam, the slide rail is extended along the first direction, a slider is fixedly provided on the anti-collision beam, and the slider is slidably connected to the slide rail.

[0015] In one of the embodiments, limit plates are fixedly provided at both ends of the slide rail.

[0016] In one of the embodiments, a pressure sensor is disposed in the anti-collision beam, and the pressure sensor is electrically connected to the control unit.

[0017] In one of the embodiments, a buffer is fixedly provided on a side of the anti-collision beam away from the support seat.

[0018] In a second aspect, an active rear protection method for a commercial vehicle is also provided in an embodiment of the present application, and the active rear protection device for a commercial vehicle is used for protection. The active rear protection method for a commercial vehicle comprises the following steps:

[0019] Use the vehicle-mounted radar to detect the distance to the rear vehicle, the speed of the rear vehicle, and the height of the rear vehicle's bumper;

[0020] Determine whether the distance to the following vehicle is less than the set distance.

[0021] If yes, then extract the speed data of the following vehicle;

[0022] Determine whether the speed of the following vehicle exceeds the set speed.

[0023] If yes, extract the bumper height of the rear car.

[0024] Determining whether the height of the rear vehicle bumper is lower than the initial height of the anti-collision beam;

[0025] If so, the driving mechanism is started to move the anti-collision beam downward to a height lower than the bumper height of the rear vehicle.

[0026] In one embodiment, the commercial vehicle active rear protection method further includes:

[0027] When the height of the rear vehicle bumper is lower than the height of the anti-collision beam, after the step of starting the driving mechanism to move the anti-collision beam downward to a height lower than the height of the rear vehicle bumper,

[0028] The pressure sensor is used to detect whether the anti-collision beam is hit.

[0029] If there is no impact, the anti-collision beam moves to the initial position.

[0030] Beneficial effects:

[0031] The embodiment of the present application provides an active rear protection device and method for commercial vehicles. The active rear protection device for commercial vehicles includes a support seat, an anti-collision beam, a driving mechanism and a control unit. The control unit receives the detection results of the vehicle-mounted radar on the speed, distance and bumper height of the rear vehicle, so that the control unit determines whether there is a collision risk. When there is a collision risk, the control unit sends a signal to the driving mechanism, so that the driving mechanism controls the anti-collision beam to slide on the support seat along the first direction, so that the anti-collision beam moves to a height lower than the bumper of the rear vehicle, thereby ensuring the safety of the rear-end vehicle and preventing the rear vehicle from drilling into the bottom of the vehicle and causing serious harm to the driver of the small rear vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic structural diagram of an active rear protection device for a commercial vehicle provided in some embodiments of the present application.

[0033] Figure 2 A schematic structural diagram of an active rear protection device for a commercial vehicle from another perspective provided in some embodiments of the present application.

[0034] Figure 3 A side view of an active rear protection device for a commercial vehicle provided in some embodiments of the present application.

[0035] Figure 4 A flowchart of an active rear protection method for a commercial vehicle provided in some embodiments of the present application.

[0036] Reference numerals:

[0037] 1. Support seat; 11. Fixed frame; 12. First support frame; 13. Second support frame; 14. Slide rail; 15. Limit plate; 16. Rotating seat;

[0038] 2. Anti-collision beam; 21. Sliding block; 22. Sliding seat;

[0039] 3. driving mechanism; 31. driving member; 32. transmission assembly; 321. rotating shaft; 322. first transmission wheel; 323. second transmission wheel;

[0040] X, first direction; Y, second direction. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0042] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does 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 therefore cannot be understood as a limitation on the present application.

[0043] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated 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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0045] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0047] like Figure 1-Figure 3 As shown, an embodiment of the present application provides an active rear protection device for a commercial vehicle. The commercial vehicle is provided with an on-board radar, which is used to detect the speed, distance and bumper height of the rear vehicle. The active rear protection device for the commercial vehicle includes a support seat 1, an anti-collision beam 2, a drive mechanism 3 and a control unit.

[0048] The support seat 1 is fixed to the rear of the commercial vehicle; the anti-collision beam 2 is slidably connected to the support seat 1 along a first direction X, and the first direction is along the height direction of the commercial vehicle; the driving mechanism 3 is fixed to the support seat 1; the control unit is used to receive the detection result of the vehicle-mounted radar, and the control unit is electrically connected to the driving mechanism 3. The control unit can control the driving mechanism 3 to drive the anti-collision beam 2 to slide relative to the support seat 1 according to the detection result.

[0049] The embodiment of the present application provides an active rear protection device for commercial vehicles. The control unit receives the detection results of the vehicle-mounted radar on the speed, distance and bumper height of the rear vehicle, so that the control unit determines whether there is a collision risk. When there is a collision risk, the control unit sends a signal to the drive mechanism 3, so that the drive mechanism 3 controls the anti-collision beam 2 to slide on the support seat 1 along the first direction, so that the anti-collision beam 2 moves to a height lower than the bumper of the rear vehicle, thereby ensuring the safety of the rear-end vehicle and preventing the rear vehicle from drilling into the bottom of the vehicle and causing serious harm to the driver of the rear vehicle.

[0050] In addition, the commercial vehicle active rear protection device is relatively independent of the commercial vehicle. When the commercial vehicle is stationary and closed, the commercial vehicle active rear protection device can perform protection work independently, thereby further improving the protection effect of the vehicle and ensuring the safety of the driver of the rear vehicle.

[0051] It should be noted that the first direction X is the X direction, and the second direction Y is the Y direction.

[0052] In the embodiment of the present application, the control unit is, for example, a microprocessor, a PLC controller, a control circuit board, etc.

[0053] like Figure 1-Figure 3 As shown, in some embodiments, the driving mechanism 3 includes a driving member 31 and a transmission assembly 32, the driving member 31 is fixed to the support seat 1, and the transmission assembly 32 is connected to the anti-collision beam 2 in a transmission manner;

[0054] The control unit can control the action of the driving member 31 according to the detection result, so that the driving member 31 drives the transmission assembly 32 to move, so that the transmission assembly 32 drives the anti-collision beam 2 to slide.

[0055] By setting a driving member 31 and a transmission assembly 32, the transmission assembly 32 is connected to the anti-collision beam 2 in transmission, and the control unit is electrically connected to the driving member 31, so that when the control unit determines that there is a risk of collision between the vehicle and the rear vehicle, it can control the driving member 31 to drive the transmission assembly 32 to drive the anti-collision beam 2 to move along the first direction, so that the anti-collision beam 2 moves to a height lower than the bumper of the rear vehicle, thereby ensuring the safety of the rear-end vehicle, avoiding the rear vehicle from drilling into the bottom of the vehicle and causing serious harm to the driver of the rear vehicle, and can greatly improve the degree of automation of the device and improve work efficiency.

[0056] like Figure 1-Figure 3As shown, specifically, the transmission assembly 32 includes a rotating shaft 321, a first transmission wheel 322 and a second transmission wheel 323. The rotating shaft 321 is extended along the first direction, one end of the rotating shaft 321 is rotatably connected to the support seat 1, and the other end is connected to the first transmission wheel 322. The output shaft of the driving member 31 is coaxially connected to the second transmission wheel 323, and the first transmission wheel 322 and the second transmission wheel 323 are meshed for transmission. A sliding seat 22 is fixedly provided on the anti-collision beam 2, and the sliding seat 22 is threadedly connected to the rotating shaft 321.

[0057] The transmission assembly 32 is composed of a rotating shaft 321, a first transmission wheel 322 and a second transmission wheel 323. The driving member 31 drives the second transmission wheel 323 to drive the first transmission wheel 322 to rotate, and the rotating shaft 321 fixed with the first transmission wheel 322 also rotates, and a sliding seat 22 is fixed on the anti-collision beam 2, so that the sliding seat 22 is threadedly connected to the rotating shaft 321, so that when the rotating shaft 321 rotates, the sliding seat 22 can move on the rotating shaft 321 accordingly, thereby realizing the movement of the anti-collision beam 2 along the first direction.

[0058] like Figure 1-Figure 3 As shown, in some embodiments, the support seat 1 includes two fixing frames 11, a first supporting frame 12 and a second supporting frame 13, the two fixing frames 11 are extended along the first direction and spaced apart along the second direction, the first supporting frame 12 is extended along the second direction, and both ends are fixedly connected to the two fixing frames 11 respectively, the second supporting frame 13 is extended along the second direction, and both ends are fixedly connected to the two fixing frames 11 respectively, and the first supporting frame 12 and the second supporting frame 13 are spaced apart along the first direction.

[0059] Specifically, the driving member 31 is fixed to the first support frame 12, the output shaft portion of the driving member 31 is located outside the first support frame 12, the second transmission wheel 323 is located outside the first support frame 12, and a rotating seat 16 is fixed to the side of the second support frame 13 close to the anti-collision beam 2. A rotating groove is opened on the rotating seat 16, and the end of the rotating shaft 321 away from the first transmission wheel 322 is inserted into the rotating groove and is rotatably connected to the rotating groove.

[0060] By providing two fixing frames 11, a first support frame 12 and a second support frame 13, and connecting and fixing the two fixing frames 11 through the first support frame 12 and the second support frame 13, the overall structure of the entire support seat 1 is more stable, and at the same time, the driving member 31 fixed on the first support frame 12 and the rotating shaft 321 inserted in the rotating groove will also be more stable, thereby making the transmission effect more stable, and then the movement of the anti-collision beam 2 along the first direction will also be more accurate, and in the event of a collision, the damage to the driver of the rear vehicle is further reduced.

[0061] like Figure 1-Figure 3As shown, in some embodiments, a slide rail 14 is provided on one side of the support seat 1 close to the anti-collision beam 2 , the slide rail 14 is extended along a first direction, a slider 21 is fixedly provided on the anti-collision beam 2 , and the slider 21 is slidably connected to the slide rail 14 .

[0062] By arranging the slide rail 14 on the support seat 1 and arranging the slider 21 on the anti-collision beam 2 , the anti-collision beam 2 can slide along the support seat 1 .

[0063] Specifically, the two fixing frames 11 are each provided with a slide rail 14 , and the anti-collision beam 2 is correspondingly provided with two sliders 21 . By providing two slide rails 14 and two sliders 21 , the anti-collision beam 2 can be made more stable on the support seat 1 , thereby further improving the protection effect.

[0064] like Figure 1-Figure 3 As shown, in some embodiments, limit plates 15 are fixedly provided at both ends of the slide rail 14 .

[0065] By fixing limit plates 15 at both ends of the slide rail 14, the moving range of the slider 21 on the slide rail 14 can be limited, thereby preventing the slider 21 from sliding out of the slide rail 14, causing the anti-collision beam 2 to separate from the support seat 1 and unable to perform normal protection operations.

[0066] like Figure 1-Figure 3 As shown, in some embodiments, a pressure sensor is provided in the anti-collision beam 2, and the pressure sensor is electrically connected to the control unit.

[0067] By arranging a pressure sensor in the anti-collision beam 2, on the one hand, the degree of collision can be judged, which is convenient for reminding the driver and processing according to the degree of collision, and a signal can be sent to the control unit to prevent the anti-collision beam 2 from automatically returning to the initial position after a collision occurs, causing secondary damage to the rear vehicle. On the other hand, when no collision occurs, the anti-collision beam 2 can automatically return to the initial position, so that the active rear protection device of the commercial vehicle can carry out the next round of detection and protection work.

[0068] like Figure 1-Figure 3 As shown, in some embodiments, a buffer mechanism is fixedly arranged between the anti-collision beam 2 and the support seat 1 .

[0069] By arranging a buffer mechanism between the anti-collision beam 2 and the support seat 1, the buffer mechanism can absorb a part of the impact force when a collision occurs, thereby reducing the degree of the collision and further reducing the damage to the driver of the rear vehicle.

[0070] Specifically, the buffer mechanism includes a telescopic rod and an elastic member. One end of the telescopic rod is fixedly connected to the anti-collision beam 2, and the other end is fixedly connected to the support frame. In the embodiment of the present application, the elastic member is a spring, which is sleeved outside the telescopic rod and located between the anti-collision beam 2 and the support seat 1.

[0071] See also Figure 4 In a second aspect, an embodiment of the present application further provides a commercial vehicle active rear protection method, which uses the above commercial vehicle active rear protection device for protection. The commercial vehicle active rear protection method includes the following steps:

[0072] Use the vehicle-mounted radar to detect the distance to the rear vehicle, the speed of the rear vehicle, and the height of the rear vehicle's bumper;

[0073] Determine whether the distance to the following vehicle is less than the set distance.

[0074] If yes, then extract the speed data of the following vehicle;

[0075] Determine whether the speed of the following vehicle exceeds the set speed.

[0076] If yes, extract the bumper height of the rear car.

[0077] When judging whether the height of the rear vehicle bumper is lower than the initial height of the anti-collision beam 2,

[0078] If yes, the driving mechanism 3 is started to move the anti-collision beam 2 down to a height lower than the rear vehicle bumper.

[0079] Through the above-mentioned active rear protection method for commercial vehicles, real-time regulation of the anti-collision beam 2 can be achieved. When a collision risk is detected, the control unit can control the driving mechanism 3 to drive the anti-collision beam 2 to a position lower than the height of the rear vehicle bumper according to the distance of the rear vehicle, the speed of the rear vehicle and the height of the bumper of the rear vehicle detected by the on-board radar, thereby ensuring the safety of the rear-end vehicle and preventing the rear vehicle from drilling into the bottom of the vehicle and causing serious harm to the driver of the rear vehicle.

[0080] It should be noted that the set distance and the set speed are pre-stored in the control unit, and the set distance, the set speed and the initial height of the anti-collision beam 2 can be customized according to actual needs.

[0081] In the embodiment of the present application, the distance is set to 100m and the speed is set to 30km / h.

[0082] like Figure 4 As shown, in some embodiments, the commercial vehicle active rear protection method further includes:

[0083] When the height of the rear vehicle bumper is lower than the height of the anti-collision beam 2, the driving mechanism 3 is started to move the anti-collision beam 2 downward to a height lower than the height of the rear vehicle bumper.

[0084] A pressure sensor is used to detect whether the anti-collision beam 2 is hit;

[0085] If it has been hit, the anti-collision beam 2 is kept at the current position.

[0086] By detecting whether the anti-collision beam 2 is hit by a pressure sensor, it can be ensured that after the anti-collision beam 2 is hit, the anti-collision beam 2 will not return to the initial position under the drive of the driving mechanism 3, thereby avoiding secondary damage to the rear vehicle during the process of the anti-collision beam 2 returning to the initial position, thereby preventing injury to the driver of the rear vehicle.

[0087] like Figure 4 As shown, in some embodiments, the commercial vehicle active rear protection method further includes:

[0088] When the height of the rear vehicle bumper is lower than the height of the anti-collision beam 2, the driving mechanism 3 is started to move the anti-collision beam 2 downward to a height lower than the height of the rear vehicle bumper.

[0089] A pressure sensor is used to detect whether the anti-collision beam 2 is hit;

[0090] If there is no collision, the anti-collision beam 2 is moved to the initial position; if there is no collision, the anti-collision beam 2 is moved to the initial position and the next round of protection operation is continued, further improving the degree of automation.

[0091] like Figure 4 As shown, in some embodiments, the commercial vehicle active rear protection method further includes:

[0092] After determining whether the distance to the following vehicle is less than the set distance,

[0093] If not, the process returns to the step of using the vehicle-mounted radar to detect the distance to the rear vehicle, the speed of the rear vehicle, and the height of the bumper of the rear vehicle.

[0094] like Figure 4 As shown, in some embodiments, the commercial vehicle active rear protection method further includes:

[0095] After determining whether the speed of the rear vehicle exceeds 30 km / h,

[0096] If the speed of the rear vehicle does not exceed 30 km / h, the process returns to the step of using the vehicle-mounted radar to detect the distance to the rear vehicle, the speed of the rear vehicle, and the height of the bumper of the rear vehicle;

[0097] like Figure 4 As shown, in some embodiments, the commercial vehicle active rear protection method further includes:

[0098] After determining whether the rear vehicle bumper height is lower than the initial height of the anti-collision beam 2,

[0099] If the height of the rear vehicle bumper is higher than the initial height of the anti-collision beam 2 , the anti-collision beam 2 remains stationary.

[0100] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0101] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An active rear protection device for a commercial vehicle, wherein the commercial vehicle is provided with a vehicle-mounted radar, and the vehicle-mounted radar is used to detect the speed, distance and bumper height of the rear vehicle, and is characterized in that: The commercial vehicle active rear protection device comprises: A support seat, the support seat is fixed to the rear of the commercial vehicle; An anti-collision beam, wherein the anti-collision beam is slidably connected to the support seat along a first direction, wherein the first direction is along a height direction of the commercial vehicle; A driving mechanism, wherein the driving mechanism is fixed to the supporting seat; A control unit is used to receive the detection result of the vehicle-mounted radar, the control unit is electrically connected to the driving mechanism, and the control unit can control the driving mechanism to drive the anti-collision beam to slide relative to the support seat according to the detection result.

2. The active rear protection device for commercial vehicles according to claim 1, characterized in that: The driving mechanism comprises a driving member and a transmission assembly, wherein the driving member is fixed to the support seat, and the transmission assembly is in transmission connection with the anti-collision beam; The control unit can control the action of the driving member according to the detection result, so that the driving member drives the transmission component to move, so that the transmission component drives the anti-collision beam to slide.

3. The active rear protection device for commercial vehicles according to claim 2, characterized in that: The transmission assembly includes a rotating shaft, a first transmission wheel and a second transmission wheel. The rotating shaft is extended along the first direction, one end of the rotating shaft is rotatably connected to the support seat, and the other end is coaxially connected to the first transmission wheel. The output shaft of the driving member is coaxially connected to the second transmission wheel, and the first transmission wheel and the second transmission wheel are meshed for transmission. A sliding seat is fixedly arranged on the anti-collision beam, and the sliding seat is threadedly connected to the rotating shaft.

4. The active rear protection device for commercial vehicles according to claim 1, characterized in that: The support seat includes two fixing frames, a first supporting frame and a second supporting frame. The two fixing frames are extended along the first direction and spaced apart along the second direction. The first supporting frame is extended along the second direction and two ends are fixedly connected to the two fixing frames respectively. The second supporting frame is extended along the second direction and two ends are fixedly connected to the two fixing frames respectively. The first supporting frame and the second supporting frame are spaced apart along the first direction.

5. The active rear protection device for commercial vehicles according to claim 1, characterized in that: A slide rail is arranged on one side of the support seat close to the anti-collision beam, and the slide rail is extended along the first direction. A slider is fixedly arranged on the anti-collision beam, and the slider is slidably connected to the slide rail.

6. The active rear protection device for commercial vehicles according to claim 5, characterized in that: Limiting plates are fixedly arranged at both ends of the slide rail.

7. The active rear protection device for commercial vehicles according to claim 1, characterized in that: A pressure sensor is arranged in the anti-collision beam, and the pressure sensor is electrically connected to the control unit.

8. The active rear protection device for commercial vehicles according to claim 1, characterized in that: A buffer is fixedly arranged on one side of the anti-collision beam away from the support seat.

9. A commercial vehicle active rear protection method, characterized in that: The active rear protection device for commercial vehicles according to any one of claims 1 to 8 is used for protection, and the active rear protection method for commercial vehicles comprises the following steps: Use the vehicle-mounted radar to detect the distance to the rear vehicle, the speed of the rear vehicle, and the height of the rear vehicle's bumper; Determine whether the distance to the following vehicle is less than the set distance. If yes, then extract the speed data of the following vehicle; Determine whether the speed of the following vehicle exceeds the set speed. If yes, extract the bumper height of the rear car. Determining whether the height of the rear vehicle bumper is lower than the initial height of the anti-collision beam; If so, the driving mechanism is started to move the anti-collision beam downward to a height lower than the bumper height of the rear vehicle.

10. The commercial vehicle active rear protection method according to claim 9, characterized in that: The commercial vehicle active rear protection method further includes: After the step of starting the driving mechanism to move the anti-collision beam downward to a height lower than the bumper height of the rear vehicle, The pressure sensor is used to detect whether the anti-collision beam is hit. If there is no impact, the anti-collision beam moves to the initial position.

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