An electrically driven tailgate ground contact indirect detection method

Abstract

This application relates to the field of vehicle tailgate bottom contact detection, and more specifically to an indirect detection method for electric follow-up vehicle tailgate ground contact. In step S1, the first drive assembly operates, and the first telescopic rod of the first drive assembly shortens, thereby opening the follower arm until it contacts the first limit switch. At this point, the follower arm is at its maximum opening angle relative to the frame. In step S2, the first limit switch is triggered and sends a ground contact signal, and the external system controls the first telescopic rod to stop shortening. In step S31, when the downhill angle of the road surface behind the vehicle is less than the maximum allowable downhill angle, or when it is horizontal or uphill, the supporting platform will contact the ground before tilting to its maximum angle and stop tilting. At this point, the first telescopic rod will continue to shorten, causing the follower arm to continue opening until it reaches its maximum opening angle and triggers the first limit switch. This invention effectively utilizes its structural configuration to achieve advantages such as not directly detecting the contact between the supporting platform and the ground, convenient detection, and simple structure.

Description

Technical Field

[0001] This application relates to the field of vehicle tailgate bottom contact detection, and more specifically to an indirect detection method for the bottom contact of an electric follow-up vehicle tailgate. Background Technology

[0002] With the development of my country's logistics industry, the demand for vehicle tailgates is constantly increasing. Most existing vehicle tailgates use hydraulic systems, which have problems such as being difficult to maintain, leaking, dripping, and freezing oil at low temperatures.

[0003] Electric vehicle tailgates typically use electric push rods instead of hydraulic cylinders. However, electric push rods have greater passive resistance, and their own weight cannot compress the electric push rods to automatically shorten when the tailgate is unloaded. Therefore, electric vehicle tailgates need to be equipped with a ground contact detection mechanism.

[0004] If a sensor is installed at the front end of the tailgate's support platform, the sensor is prone to damage due to long-term contact with the ground, and it is also prone to failure on uneven or waterlogged surfaces.

[0005] The automated control method for automobile tailgates (CN202311174221.6) mentions that "when the tailgate surface contacts the ground, the lifting push rod shortens, and its motor current increases significantly. When the current exceeds the set value, the feedback signal is used as the tailgate ground contact detection signal." This method has the disadvantage of large error. In addition, this design requires the tailgate to shorten until it touches the ground and presses against the ground, causing the motor current to increase and send out the detection signal. This requires an electric push rod to provide pulling force, which increases the overall cost of the machine.

[0006] Therefore, there is a need for an indirect detection method for the contact between the load-bearing platform and the ground of an electric follow-up vehicle that is convenient to detect and has a simple structure. Summary of the Invention

[0007] The main objective of this application is to provide an indirect detection method for the tailgate contact of an electric follow-up vehicle. This method can effectively utilize its own structural configuration to achieve the advantages of not directly detecting the contact between the load-bearing platform and the ground, and is convenient for detection.

[0008] Another objective of this application is to provide a method for indirectly detecting the ground contact of the tailgate of an electric follow-up vehicle, wherein the method includes:

[0009] S1: The first drive component operates, and the first telescopic rod of the first drive component is shortened, thereby causing the follower arm to open until the follower arm contacts the first limit switch. At this time, the follower arm is at its maximum opening angle relative to the frame. This maximum angle is the opening angle of the follower arm when the front end of the bearing platform tilts down to the maximum angle.

[0010] S2: The first limit switch is triggered and sends a grounding signal, and the external system controls the first telescopic rod to stop shortening.

[0011] S31: When the downhill angle of the road behind the vehicle is less than the maximum allowable downhill angle, or when it is horizontal or uphill, if the carrying platform will come into contact with the ground and stop tilting before the front end tilts down to the maximum angle, the first telescopic rod will continue to shorten. This will cause the follow-up boom to continue to open and the lifting seat to continue to rotate counterclockwise around the pin until the follow-up boom opens to the maximum angle and triggers the first limit switch, so that the first limit switch sends a ground contact signal and the system stops.

[0012] S32: When the downhill angle of the road behind the vehicle exceeds the maximum downhill angle, the carrying platform always abuts against the lifting seat and tilts downward until the follower arm opens to the maximum angle, triggering the first limit switch, thereby stopping the system. At this time, the front end of the carrying platform can never touch the ground, but the system can receive a ground touch signal to control the shutdown.

[0013] Another objective of this application is to provide another indirect detection method for the tailgate contact with the ground of an electric follow-up vehicle, wherein the indirect detection method for the tailgate contact with the ground of an electric follow-up vehicle includes:

[0014] S4: When the bearing platform stops tilting and comes into contact with the ground before tilting to the maximum angle at the front end, if the first telescopic rod continues to shorten, the boom will continue to open and the lifting seat will continue to rotate counterclockwise around the pin until the contact rod contacts the second limit switch, so that the second limit switch sends a ground contact signal and the system stops.

[0015] Another objective of this application is to provide an indirect detection method for the ground contact of an electric follow-up vehicle tailgate. The electric follow-up vehicle tailgate ground contact indirect detection method has a simple structure, is easy to operate, does not involve complex manufacturing processes and expensive materials, has high economic efficiency, and is easy to promote and use.

[0016] To achieve at least one of the above-mentioned objectives, this application provides an indirect detection method for the ground contact of an electric follow-up vehicle's tailgate, wherein the indirect detection method for the ground contact of an electric follow-up vehicle's tailgate includes:

[0017] A car tailgate lifting device includes a frame, two drive units, a support platform, a first limit switch, and a second limit switch. Each drive unit includes a follower arm, a lifting arm, a fixed beam, a first drive assembly, a lifting seat, and a buffer wheel. The top of the follower arm is hinged to the frame, the middle of the follower arm is hinged to the lifting arm, and the lower end of the follower arm is hinged to the bottom end of the first drive assembly. The top of the fixed beam is hinged to the frame, the other end of the first drive assembly is hinged to the lower middle end of the lifting arm, and the bottom end of the fixed beam is hinged to the lifting seat. The lower end of the lifting arm is hinged together with the upper end of the lifting seat and the upper part of the rear end of the bearing platform. The lower part of the rear end of the bearing platform abuts against the lifting seat. The first drive assembly also includes a first telescopic rod. The first limit switch is mounted on the frame and faces the follower arm. The second limit switch is mounted on the outside of the fixed beam. A contact rod is also mounted on the outer wall of the lifting seat. The contact rod is arranged laterally and located below the second limit switch. The buffer wheel is mounted on the outside of the lifting seat. The indirect detection method for the electric follower vehicle tailgate contacting the ground includes:

[0018] S1: The first drive component operates, and the first telescopic rod of the first drive component is shortened, thereby causing the follower arm to open until the follower arm contacts the first limit switch. At this time, the follower arm is at its maximum opening angle relative to the frame. This maximum angle is the opening angle of the follower arm when the front end of the bearing platform tilts down to the maximum angle.

[0019] S2: The first limit switch is triggered and sends a grounding signal, and the external system controls the first telescopic rod to stop shortening.

[0020] S31: When the downhill angle of the road behind the vehicle is less than the maximum allowable downhill angle, or when it is horizontal or uphill, if the carrying platform will come into contact with the ground and stop tilting before the front end tilts down to the maximum angle, the first telescopic rod will continue to shorten. This will cause the follow-up boom to continue to open and the lifting seat to continue to rotate counterclockwise around the pin until the follow-up boom opens to the maximum angle and triggers the first limit switch, so that the first limit switch sends a ground contact signal and the system stops.

[0021] S32: When the downhill angle of the road behind the vehicle exceeds the maximum downhill angle, the carrying platform always abuts against the lifting seat and tilts downward until the follower arm opens to the maximum angle, triggering the first limit switch, thereby stopping the system. At this time, the front end of the carrying platform can never touch the ground, but the system can receive a ground touch signal to control the shutdown.

[0022] In one or more embodiments of this application, an indirect detection method for the ground contact of an electric follow-up vehicle tailgate is provided, wherein two first mounting plates are provided on the top of the frame, and two second mounting plates are provided on one side of the frame. The two first mounting plates are arranged opposite to each other and spaced apart by a predetermined distance, and the two second mounting plates are arranged opposite to each other and spaced apart by a predetermined distance. Two driving devices are respectively engaged with the two first mounting plates, and the two driving devices are also respectively engaged with the two second mounting plates. One end of the follow-up arm is rotatably connected to the first mounting plate, and one end of the fixed beam is rotatably connected to the second mounting plate.

[0023] In one or more embodiments of this application, the first drive assembly further includes a first drive component, the first telescopic rod is connected to the first drive component, and the first drive component is configured to drive the first telescopic rod to extend or retract by a predetermined length, and the end of the first drive component opposite to the first telescopic rod is rotatably connected to the bottom of the follower arm, the end of the first telescopic rod opposite to the first drive component is rotatably connected to the bottom of the other end of the lifting arm, and the end of the lifting arm connected to the first telescopic rod is also rotatably connected to the bearing platform.

[0024] In one or more embodiments of this application, each of the driving devices further includes a second driving assembly fixed to the fixed beam. Specifically, the second driving assembly includes a support platform, a second driving component, and a second telescopic rod. The support platform is fixed to the middle section of the fixed beam, and one end of the second driving component is rotatably connected to the support platform. The second driving component is located between the fixed beam and the lifting arm. One end of the second telescopic rod is connected to the second driving component, and the second driving component is configured to drive the second telescopic rod to extend or retract by a predetermined length.

[0025] In one or more embodiments of this application, the tail of the carrying platform further has two connecting parts, the two connecting parts are arranged opposite to each other and spaced apart by a predetermined distance, and each connecting part is located between the corresponding lifting seat and the lifting arm, while the end of the second telescopic rod away from the second driving component is rotatably connected to the connecting part.

[0026] In one or more embodiments of this application, the electric follow-up vehicle tailgate lifting device further includes a connecting shaft, the connecting shaft being located between the two drive devices, and the sides of the two lifting arms that are close to each other being fixedly connected to both ends of the connecting shaft.

[0027] In one or more embodiments of this application, two pressure plates are installed at the rear end of the support platform and on the side near the lifting seat, and each of the two lifting seats is provided with a support plate on the side near the support platform, and the two support plates are configured to contact the two pressure plates respectively. Attached Figure Description

[0028] These and / or other aspects and advantages of this application will become clearer and more readily understood from the following detailed description of embodiments of this application taken in conjunction with the accompanying drawings, wherein:

[0029] Figure 1 The illustration shows a schematic diagram of an electric tailgate for a car. Figure 1 .

[0030] Figure 2 The illustration shows a schematic diagram of an electric tailgate for a car. Figure 2 .

[0031] Figure 3 The illustration shows a schematic diagram of an electric tailgate for a car. Figure 3 .

[0032] Figure 4 The diagram illustrates the structure of an electric tailgate for a car.

[0033] Figure 5 The diagram shows the downward tilt of the front end of the support platform.

[0034] Figure 6 The diagram shows the condition of the road surface on the downhill section at the rear.

[0035] Figure 7 The diagram shows the separated state of the support platform and the lifting seat.

[0036] Figure 8 The diagram illustrates the detection scheme for the follower boom.

[0037] Figure 9 The diagram illustrates a situation where the downhill angle is too large.

[0038] Figure 10 The diagram shows a detailed schematic of the detection follower boom scheme.

[0039] Figure 11 The diagram illustrates the inspection plan for the support seat. Detailed Implementation

[0040] The terms and words used in the following specification and claims are not limited to their literal meaning, but are used solely by the inventors to enable a clear and consistent understanding of this application. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of this application is provided for illustrative purposes only and not for the purpose of limiting the application as defined in the appended claims and their equivalents.

[0041] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0042] While ordinal numbers such as "first," "second," etc., will be used to describe various components, this does not limit which components are used. The term is used only to distinguish one component from another. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component, without departing from the teachings of the inventive concept. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0043] The terminology used herein is for the purpose of describing various embodiments only and is not intended to be limiting. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It will also be understood that the terms “comprising” and / or “having” as used in this specification specify the presence of the described features, numbers, steps, operations, components, elements or combinations thereof, without excluding the presence or addition of one or more other features, numbers, steps, operations, components, elements or groups thereof.

[0044] Indicative method for indirect detection of tailgate contact with ground in electric servo vehicles

[0045] refer to Figures 1 to 11 According to a preferred embodiment of the electric tailgate contact indirect detection method of the present invention, it should be noted that the electric tailgate contact indirect detection method includes an electric tailgate lifting device, the electric tailgate lifting device comprising a frame 01, the frame 01 being mounted on an external vehicle. Furthermore, it should be noted that the top of the frame 01 is provided with two first mounting plates 14, and one side of the frame 01 is provided with two second mounting plates 13. The two first mounting plates 14 are arranged opposite each other and spaced apart by a predetermined distance, and the two second mounting plates 13 are also arranged opposite each other and spaced apart by a predetermined distance.

[0046] It should be noted that the electric follow-up vehicle tailgate lifting device further includes two drive units, each of which cooperates with one of the two first mounting plates 14, and each of the two drive units also cooperates with one of the two second mounting plates 13. It is worth mentioning that each drive unit includes a follower arm 02, one end of which is rotatably connected to the first mounting plate 14. Specifically, as shown... Figure 2As shown, the follower arm 02 can be implemented as two plates, and the two plates are respectively located on both sides of the corresponding first mounting plate 14, and are rotatably connected to the first mounting plate 14. That is, the follower arm 02 can rotate with the connection point between the first connecting plate and the follower arm 02 as the center.

[0047] Furthermore, each of the aforementioned drive devices also includes a lifting arm 03, one end of which is rotatably disposed in the middle section of the follower arm 02. Specifically, a movable shaft or a fixed shaft may be provided between the two plates, and one end of the lifting arm 03 is fixedly connected to the movable shaft or rotatably connected to the movable shaft.

[0048] Furthermore, each of the aforementioned driving devices further includes a first driving assembly 05, one end of which is rotatably connected to the bottom of the follower arm 02. Specifically, both sides of the end of the first driving assembly 05 are rotatably connected to the side of the two plates that are close to each other. It should be noted that the first driving assembly 05 includes a first driving component and a first telescopic rod. The first telescopic rod is connected to the first driving component, and the first driving component is configured to drive the first telescopic rod to extend or retract by a predetermined length. The end of the first driving component facing away from the first telescopic rod is rotatably connected to the bottom of the follower arm 02. The first driving component and the first telescopic rod can be implemented as an electric push rod.

[0049] It is worth mentioning that the end of the first telescopic rod opposite to the first driving component is rotatably connected to the bottom of the other end of the lifting arm 03. Specifically, as follows... Figure 2 The diagram shows a partial structure of the drive device.

[0050] It should also be noted that the two drive devices are located between the two second mounting plates 13, and each drive device further includes a fixed beam 04, one end of which is rotatably connected to the second mounting plate 13.

[0051] It is worth mentioning that the electric follow-up vehicle tailgate lifting device also includes a support platform 09, and each of the driving devices also includes a lifting seat 07. The tops of both lifting seats 07 are rotatably connected to the support platform 09, and the other end of the fixed beam 04 is rotatably connected to the bottom of one of the lifting seats 07. It should be noted that the end of the lifting arm 03 connected to the first telescopic rod is also rotatably connected to the support platform 09. Specifically, the lower end of the lifting arm 03 is hinged together with the upper end of the lifting seat 07 and the upper rear end of the support platform 09, and the lower rear end of the support platform 09 abuts against the lifting seat 07.

[0052] It should also be noted that each of the driving devices further includes a second driving assembly 06, which is fixed to the fixed beam 04. Specifically, the second driving assembly 06 includes a support platform, a second driving component, and a second telescopic rod. The support platform is fixed to the middle section of the fixed beam 04, and one end of the second driving component is rotatably connected to the support platform. The second driving component is located between the fixed beam 04 and the lifting arm 03. One end of the second telescopic rod is connected to the second driving component, and the second driving component is configured to drive the second telescopic rod to extend or retract by a predetermined length. It is worth mentioning that the rear of the bearing platform 09 also has two connecting portions. The two connecting portions are arranged opposite each other and spaced a predetermined distance apart. Each connecting portion is located between the corresponding lifting seat 07 and the lifting arm 03. Simultaneously, the end of the second telescopic rod facing away from the second driving component is rotatably connected to the connecting portion, as shown in the figure below. Figure 3 As shown, when the second driving component drives the second telescopic rod to extend a predetermined length, the second telescopic rod applies a force to the connecting part, thereby causing the connection between the connecting part and the bearing platform 09 to apply a force to the bearing platform 09, causing the bearing platform 09 to rotate about the connection between the connecting part and the second telescopic rod.

[0053] The electric follow-up vehicle tailgate lifting device also includes a connecting shaft 100, which is located between the two drive devices, and the two lifting arms 03 are fixedly connected to the two ends of the connecting shaft 100 on the side that is close to each other.

[0054] It is worth mentioning that two pressure plates 10 are installed at the rear end of the bearing platform 09 and on the side near the lifting seat 07, and a support plate 11 is provided on the side of each of the two lifting seats 07 near the bearing platform 09, and the two support plates 11 are configured to contact the two pressure plates 10 respectively.

[0055] It should also be noted that a buffer wheel 08 is installed on each of the two opposing sides of the lifting seats 07 to prevent the connection between the bearing platform 09 and the drive device from directly contacting the ground when the platform is lowered.

[0056] It should also be noted that the above-mentioned driving device further includes a first limit switch 21, and one of the second mounting plates 13 is also provided with a connecting rod 20. A first limit switch 21 is also installed at the end of the connecting rod 20 away from the second mounting plate 13. The first limit switch 21 and the second forming switch are located on the same side. In addition, the first limit switch 21 is configured to be able to contact the end of the second mounting plate 13 near the connecting rod 20.

[0057] It should be noted that the following section explains the indirect detection method for the tailgate contact with the ground of an electric follow-up vehicle.

[0058] S1: The first drive assembly 05 operates. When the follower arm 02 contacts the first limit switch 21, this is the maximum opening angle of the follower arm 02 relative to the frame 01. This maximum angle is the opening angle of the follower arm 02 when the front end of the bearing platform 09 tilts down to the maximum angle. Specifically, as follows... Figure 3 As shown;

[0059] S2: The first limit switch 21 is triggered and sends a grounding signal, and the external system controls the first telescopic rod to stop shortening.

[0060] It should be noted that this solution indirectly controls the angle of the lifting seat 07 relative to the frame 01 by detecting and controlling the maximum opening angle of the follower arm 02. Because of the hinged and abutting relationship between the bearing platform 09 and the lifting seat 07, when the downhill angle of the road behind the vehicle is less than the maximum allowable downhill angle, or when it is horizontal or uphill, if the bearing platform 09 stops tilting down before reaching the maximum angle, the first telescopic rod will continue to shorten. This will cause the follower arm 02 to continue to open and the lifting seat 07 to continue to rotate counterclockwise around the pin 12, causing the pressure plate 10 and the support plate 11 to separate until the follower arm 02 opens to the maximum angle, triggering the first limit switch 21 to send a ground contact signal and the system to stop.

[0061] In addition, when the downhill angle of the road behind the vehicle exceeds the maximum downhill angle of the product, the load-bearing platform 09 always presses against the lifting seat 07 and tilts downward until the follower boom 02 opens to the maximum angle, triggering the limit switch system to stop. The front end of the load-bearing platform 09 can never touch the ground, but the system can receive a ground contact signal to control the shutdown.

[0062] In addition, the present invention provides another detection method. It is worth mentioning that the aforementioned driving device also includes another second limit switch 21. This second limit switch 21 is located on the side of one of the fixed beams 04 opposite to the corresponding second driving component. A contact rod 30 is also installed on the outer wall of the support seat 07 near the second limit switch 21. The contact rod 30 is arranged laterally and located below the second limit switch 21, meaning the second limit switch 21 is configured to contact the contact rod 30. Furthermore, after the buffer wheel 08 touches the ground, the support seat 07, carrying the contact rod 30, rotates counterclockwise around the pin 12. When the support seat 07 rotates to its maximum angle, the front end of the contact rod 30 abuts against the contact of the second limit switch 21 and compresses and triggers the second limit switch 21, emitting a ground contact signal. The principle of this scheme is to detect the maximum angle between the lifting seat 07 and the fixed beam 04. After the tailgate is installed on a certain vehicle model, the height of the frame 01 from the ground is a fixed value. Therefore, when the buffer wheel 08 touches the ground, the angle between the fixed beam 04 and the frame 01 is a fixed value. Thus, by detecting the maximum angle between the lifting seat 07 and the fixed beam 04, the maximum angle between the lifting seat 07 and the frame 01 can be indirectly detected.

[0063] Specifically, S1: When the bearing platform 09 stops tilting and comes into contact with the ground before tilting to the maximum angle at the front end, if the first telescopic rod continues to shorten, the boom 02 will continue to open and the lifting seat 07 will continue to rotate counterclockwise around the pin 12, causing the pressure plate 10 and the support plate 11 that are pressed together to separate until the connecting rod 20 contacts the second limit switch 21.

[0064] That is, the first and second limit switches 21 ensure that the external system can receive the ground contact signal to control the shutdown. It should also be noted that when the same car tailgate is installed on different car models, its installation height varies, meaning the height of the frame 01 from the ground will differ. When the height of the frame 01 from the ground changes, the opening angle of the follower arm 02 corresponding to the maximum tilt angle of the front end of the support platform 09 will change slightly. The connecting rod 20 has an elongated mounting hole 22, which allows for fine-tuning of the first limit switch 21 to ensure that the follower arm 02 triggers the first limit switch 21 precisely before the front end of the support platform 09 tilts down to its maximum angle.

[0065] Similarly, when the height of the frame 01 above the ground changes, the angle between the fixed beam 04 and the frame 01 will also change. Therefore, the position of the contact rod 30 on the support seat 07 can be adjusted through the oblong hole 31 to ensure that the trigger plate triggers the second limit switch 21 just before the front end of the bearing platform 09 tilts down to the maximum angle. It should also be noted that, compared with directly detecting the contact between the bearing platform and the ground, the indirect detection of the angle sensor of the follower arm or support seat is not affected by unknown ground conditions, has high accuracy, and does not require exposure to harsh environments.

[0066] In summary, the indirect detection method for the tailgate contact of an electric follow-up vehicle based on the embodiments of this application has been clarified, which provides advantages such as not directly detecting the contact between the load-bearing platform and the ground, convenient detection, and simple structure.

[0067] It is worth mentioning that, in this embodiment, the electric follow-up vehicle tailgate contact indirect detection method has a simple structure, does not involve complex manufacturing processes or expensive materials, and is highly economical. At the same time, for manufacturers, the electric follow-up vehicle tailgate contact indirect detection method provided in this application is easy to produce and has low cost, which is more conducive to controlling production costs and further facilitates product promotion and use.

[0068] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and any modifications or variations of the implementation of the present invention may be made without departing from these principles.

Claims

1. A method for indirectly detecting the ground contact of an electric follow-up vehicle's tailgate, characterized in that, The indirect detection method for the tailgate contact with the ground of an electric follow-up vehicle includes: A car tailgate lifting device includes a frame, two drive units, a support platform, a first limit switch, and a second limit switch. Each drive unit includes a follower arm, a lifting arm, a fixed beam, a first drive assembly, a lifting seat, and a buffer wheel. The top of the follower arm is hinged to the frame, the middle of the follower arm is hinged to the lifting arm, and the lower end of the follower arm is hinged to the bottom end of the first drive assembly. The top of the fixed beam is hinged to the frame, the other end of the first drive assembly is hinged to the lower middle end of the lifting arm, and the bottom end of the fixed beam is hinged to the lifting seat. The lower end of the lifting arm is hinged together with the upper end of the lifting seat and the upper part of the rear end of the bearing platform. The lower part of the rear end of the bearing platform abuts against the lifting seat. The first drive assembly also includes a first telescopic rod. The first limit switch is mounted on the frame and faces the follower arm. The second limit switch is mounted on the outside of the fixed beam. A contact rod is also mounted on the outer wall of the lifting seat. The contact rod is arranged laterally and located below the second limit switch. The buffer wheel is mounted on the outside of the lifting seat. The indirect detection method for the electric follower vehicle tailgate contacting the ground includes: S1: The first drive component operates, and the first telescopic rod of the first drive component is shortened, thereby causing the follower arm to open until the follower arm contacts the first limit switch. At this time, the follower arm is at its maximum opening angle relative to the frame. This maximum angle is the opening angle of the follower arm when the front end of the bearing platform tilts down to the maximum angle. S2: The first limit switch is triggered and sends a grounding signal, and the external system controls the first telescopic rod to stop shortening. S31: When the downhill angle of the road behind the vehicle is less than the maximum allowable downhill angle, or when it is horizontal or uphill, if the carrying platform stops tilting down before the front end tilts to the maximum angle, the first telescopic rod will continue to shorten. This will cause the follower boom to continue to open and the lifting seat to continue to rotate counterclockwise around the pin until the follower boom opens to the maximum angle and triggers the first limit switch, so that the first limit switch sends a ground contact signal and the system stops. S32: When the downhill angle of the road behind the vehicle exceeds the maximum downhill angle, the carrying platform always abuts against the lifting seat and tilts downward until the follower arm opens to the maximum angle and triggers the first limit switch, thereby stopping the system. At this time, the front end of the carrying platform can never touch the ground, but the system can receive a ground contact signal to control the shutdown.

2. The indirect detection method for ground contact of an electric follow-up vehicle tailgate according to claim 1, wherein S4: when the bearing platform stops tilting and comes into contact with the ground before tilting to the maximum angle at the front end, if the first telescopic rod continues to shorten, the follow-up arm will continue to open and the lifting seat will continue to rotate counterclockwise around the pin until the contact rod contacts the second limit switch, so that the second limit switch sends a ground contact signal and the system stops.

3. The method for indirect detection of electric follow-up vehicle tailgate contact with the ground according to claim 2, wherein the top of the frame is further provided with two first mounting plates, and one side of the frame is further provided with two second mounting plates, the two first mounting plates are arranged opposite to each other and spaced apart by a predetermined distance, and the two second mounting plates are arranged opposite to each other and spaced apart by a predetermined distance, the two driving devices are respectively engaged with the two first mounting plates, and the two driving devices are also respectively engaged with the two second mounting plates, wherein one end of the follow-up arm is rotatably connected to the first mounting plate, and one end of the fixed beam is rotatably connected to the second mounting plate.

4. The method for indirect detection of electric follow-up vehicle tailgate contact with the ground according to claim 3, wherein the first drive assembly further includes a first drive component, the first telescopic rod is connected to the first drive component, and the first drive component is configured to drive the first telescopic rod to extend or retract by a predetermined length, and the end of the first drive component opposite to the first telescopic rod is rotatably connected to the bottom of the follow-up arm, the end of the first telescopic rod opposite to the first drive component is rotatably connected to the bottom of the other end of the lifting arm, and the end of the lifting arm connected to the first telescopic rod is also rotatably connected to the bearing platform.

5. The method for indirect detection of electric follow-up vehicle tailgate contact with the ground according to claim 4, wherein each of the driving devices further includes a second driving assembly, the second driving assembly being fixed on the fixed beam, the second driving assembly including a support platform, a second driving component and a second telescopic rod, the support platform being fixed in the middle section of the fixed beam, and one end of the second driving component being rotatably connected to the support platform, and the second driving component being located between the fixed beam and the lifting arm, and one end of the second telescopic rod being connected to the second driving component, and the second driving component being configured to drive the second telescopic rod to extend or retract by a predetermined length.

6. The method for indirect detection of electric follow-up vehicle tailgate contact with the ground according to claim 5, wherein the rear of the carrying platform further comprises two connecting parts, the two connecting parts are arranged opposite to each other and spaced apart by a predetermined distance, and each connecting part is located between the corresponding lifting seat and the lifting arm, while the end of the second telescopic rod away from the second driving component is rotatably connected to the connecting part.

7. The method for indirect detection of electric follow-up vehicle tailgate contact with the ground according to claim 6, wherein the electric follow-up vehicle tailgate lifting device further includes a connecting shaft, the connecting shaft is located between the two driving devices, and the side of the two lifting arms that is close to each other is fixedly connected to both ends of the connecting shaft.

8. The method for indirect detection of electric follow-up vehicle tailgate contact with the ground according to claim 7, wherein two pressure plates are installed at the rear end of the bearing platform and on the side near the lifting seat, and each of the two lifting seats is provided with a support plate on the side near the bearing platform, and the two support plates are configured to contact the two pressure plates respectively.

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