Electric tailgate control method and electric tailgate control system

Abstract

The application discloses a power tail gate control method and a power tail gate control system, wherein the power tail gate control method comprises the following steps: (a) when a vehicle battery outputs a first direction current to a driving motor through a driving circuit, allowing the driving motor to drive the tail gate to switch from a self-closing state to an opening state; (b) when the vehicle battery outputs a second direction current to the driving motor through the driving circuit, allowing the driving motor to drive the tail gate to switch from a self-opening state to a closing state; (c) when the vehicle battery does not output the current to the driving motor through the driving circuit, rotating a rotor of the driving motor to generate induced current when the tail gate switches from the self-opening state to the closing state; and (d) outputting the induced current to the driving motor through the driving circuit to increase the resistance when the tail gate switches from the self-opening state to the closing state, thereby preventing the tail gate from being broken, and achieving the purpose of protecting the power tail gate.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric tailgate control of a vehicle, and in particular, to an electric tailgate control method and an electric tailgate control system. BACKGROUND

[0002] With the development of technology, electric tailgates have emerged and been widely used. Unlike manual tailgates, the struts system of an electric tailgate is configured with a drive motor and a strut that is drivably connected to the drive motor. When the battery of the vehicle inputs a first direction current to the drive motor through a drive circuit, the drive motor extends the strut to open the tailgate. When the battery of the vehicle inputs a second direction current to the drive motor through the drive circuit, the drive motor retracts the strut to close the tailgate. For the convenience of operation, the electric tailgate has a manual mode to allow the user to manually close the tailgate. For some users, they often exert a large force on the tailgate when manually closing the tailgate, i.e., the tailgate may be violently closed. When the tailgate is violently closed, the reduction gear of the strut system for connecting the drive motor and the strut is easily damaged. To avoid this problem, the current practice is to configure a clutch for the strut system to protect the reduction gear by disconnecting the reduction gear when the tailgate is closed. Although the configuration of the clutch for the strut system can protect the reduction gear, the configuration of the clutch for the strut system also has many defects. For example, the configuration of the clutch for the strut system also needs to configure a mechanism for controlling the clutch, which leads to a complex structure of the strut system, high control difficulty, and affects the reliability of the strut system, and the size of the strut system cannot be reduced, which affects the miniaturization of the strut system. In addition, the parking and driving environments of the vehicle are complex and diverse. How to prolong the reliability and service life of the electric tailgate by improving the waterproof performance of the strut system is also one of the technical problems that the inventors of the present application are committed to solve. SUMMARY

[0003] One object of the present application is to provide an electric tailgate control method and an electric tailgate control system, wherein the electric tailgate control method can provide explosion-proof protection for the electric tailgate to protect the strut device of the electric tailgate, such as the drive motor and the reduction gear of the strut device, when the user manually closes the tailgate.

[0004] One object of the present application is to provide an electric tailgate control method and an electric tailgate control system, wherein when a user manually closes a tailgate, the electric tailgate control method outputs induced current generated by a drive motor to the drive motor through a drive circuit, i.e., the induced current generated by the drive motor can be consumed inside the drive motor to increase resistance of the tailgate when being manually closed, so that the electric tailgate control method provides anti-blowing protection for the electric tailgate.

[0005] One object of the present application is to provide an electric tailgate control method and an electric tailgate control system, wherein the electric tailgate control method provides resistance by consuming induced current generated by a drive motor inside the drive motor, so that the electric tailgate control method of the present application can provide anti-blowing protection for the electric tailgate without adding other mechanisms, which is beneficial to simplify the structure of the strut device and improve the reliability of the strut device, and is also beneficial to reduce the size of the strut device.

[0006] One object of the present application is to provide an electric tailgate control method and an electric tailgate control system, wherein the electric tailgate control method provides resistance by consuming induced current generated by a drive motor inside the drive motor, so that the more force a user uses to manually close a tailgate, the greater resistance the drive motor can provide, so that the electric tailgate control method of the present application can effectively provide anti-blowing protection for the electric tailgate.

[0007] One object of the present application is to provide an electric tailgate control method and an electric tailgate control system, wherein when a user uses small force to close a tailgate, the electric tailgate control method can not need to provide resistance, and only when the user uses large force to close the tailgate, the electric tailgate control method provides resistance to provide anti-blowing protection for the electric tailgate, so that the electric tailgate control method can improve user experience while providing anti-blowing protection for the electric tailgate.

[0008] One object of the present application is to provide an electric tailgate control method and an electric tailgate control system, wherein when a tailgate is manually closed, the electric tailgate control method selects whether to provide resistance by detecting closing speed of the tailgate. In one typical example of the present application, the electric tailgate control method obtains closing speed of the tailgate by detecting current value of induced current generated by the drive motor. In other words, the electric tailgate control method of the present application does not need to set a special speed detection structure to obtain closing speed of the tailgate.

[0009] An object of the present application is to provide an electric tailgate control method and an electric tailgate control system, in which the electric tailgate control method allows a vehicle battery to supply power to a driving motor to further increase resistance when a tailgate is manually closed too fast, thereby effectively improving the anti-blowout protection effect.

[0010] An object of the present application is to provide an electric tailgate control method and an electric tailgate control system, in which the brace bar device has good waterproof ability to avoid rainwater from penetrating into the assembly environment of the driving motor to play a role in protecting the driving motor.

[0011] According to an aspect of the present application, the present application provides an electric tailgate control method, in which the electric tailgate control method comprises the following steps:

[0012] (a) when a vehicle battery outputs a first direction current to a driving motor through a driving circuit, allowing the driving motor to drive a tailgate to switch from a closed door state to an open door state;

[0013] (b) when the vehicle battery outputs a second direction current to the driving motor through the driving circuit, allowing the driving motor to drive the tailgate to switch from the open door state to the closed door state;

[0014] (c) when the vehicle battery does not output current to the driving motor through the driving circuit, the rotor of the driving motor driven by the tailgate switching from the open door state to the closed door state rotates to make the driving motor generate induced current; and

[0015] (d) outputting induced current to the driving motor through the driving circuit to increase the resistance when the tailgate switches from the open door state to the closed door state.

[0016] According to an embodiment of the present application, in the step (d), the vehicle battery outputs the first direction current to the driving motor through the driving circuit to further increase the resistance when the tailgate switches from the open door state to the closed door state.

[0017] According to an embodiment of the present application, in the step (d), the induced current is intermittently outputted to the driving motor through the driving circuit.

[0018] According to an embodiment of the present application, in the step (d), the vehicle battery intermittently outputs the first direction current to the driving motor through the driving circuit.

[0019] According to an embodiment of the present application, before the step (d), the electric tailgate control method further comprises the step of:

[0020] (e) determining whether the speed of the tailgate switching from the open state to the closed state is greater than a first preset threshold value, and outputting induced current to the driving motor by the driving circuit when the speed of the tailgate switching from the open state to the closed state is greater than the first preset threshold value.

[0021] According to one embodiment of the present application, before the step (d), the electric tailgate control method further comprises the steps of:

[0022] (f) determining whether the speed of the tailgate switching from the open state to the closed state is greater than a second preset threshold value, and outputting the first direction current to the driving motor by the driving circuit when the speed of the tailgate switching from the open state to the closed state is greater than the second preset threshold value.

[0023] According to one embodiment of the present application, the step (e) further comprises the steps of:

[0024] (e.1) collecting induced current generated by the driving motor;

[0025] (e.2) determining the speed of the tailgate switching from the open state to the closed state according to the current value of the induced current of the driving motor; and

[0026] (e.3) comparing the speed of the tailgate switching from the open state to the closed state with the first preset threshold value to determine whether the speed of the tailgate switching from the open state to the closed state is greater than the first preset threshold value.

[0027] According to one embodiment of the present application, the step (f) further comprises the steps of:

[0028] (f.1) collecting induced current generated by the driving motor;

[0029] (f.2) determining the speed of the tailgate switching from the open state to the closed state according to the current value of the induced current of the driving motor; and

[0030] (f.3) comparing the speed of the tailgate switching from the open state to the closed state with the second preset threshold value to determine whether the speed of the tailgate switching from the open state to the closed state is greater than the second preset threshold value.

[0031] According to another aspect of the present application, the present application further provides an electric tailgate control system, which comprises:

[0032] a controller;

[0033] a vehicle battery;

[0034] a drive motor;

[0035] a tailgate, wherein the tailgate is drivingly connected to the drive motor; and

[0036] a drive circuit, wherein the drive circuit is arranged to be connected to the vehicle battery, the drive motor and the controller, to control the vehicle battery to supply power to the drive motor through the drive circuit under the control of the controller, wherein the controller is arranged to perform the following steps:

[0037] (A) when the vehicle battery outputs a first direction current to the drive motor through the drive circuit, the drive motor drives the tailgate to switch from a closed state to an open state;

[0038] (B) when the vehicle battery outputs a second direction current to the drive motor through the drive circuit, the drive motor drives the tailgate to switch from the open state to the closed state;

[0039] (C) when the vehicle battery does not output current to the drive motor through the drive circuit, the tailgate driving the rotor of the drive motor to rotate to generate induced current when the tailgate switches from the open state to the closed state;

[0040] (D) outputting induced current to the drive motor through the drive circuit to increase the resistance when the tailgate switches from the open state to the closed state.

[0041] According to one embodiment of the present application, in the step (D), the controller controls the vehicle battery to output the first direction current to the drive motor through the drive circuit to further increase the resistance when the tailgate switches from the open state to the closed state.

[0042] According to one embodiment of the present application, in the step (D), the controller controls the drive circuit to output induced current to the drive motor intermittently.

[0043] According to one embodiment of the present application, in the step (D), the controller controls the vehicle battery to output the first direction current to the drive motor through the drive circuit intermittently.

[0044] According to one embodiment of the present application, before the step (D), the controller is arranged to further perform the following step:

[0045] (E) determining whether the speed of the tailgate when transitioning from the open state to the closed state is greater than a first preset threshold value, and outputting an induced current to the drive motor through the drive circuit when the speed of the tailgate when transitioning from the open state to the closed state is greater than the first preset threshold value.

[0046] According to one embodiment of the present application, before the step (D), the controller is configured to further perform the step of:

[0047] (F) determining whether the speed of the tailgate when transitioning from the open state to the closed state is greater than a second preset threshold value, and outputting the first direction current to the drive motor through the drive circuit when the speed of the tailgate when transitioning from the open state to the closed state is greater than the second preset threshold value. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 is a side view of a vehicle according to a preferred embodiment of the present application.

[0049] Figure 2 is a cross-sectional view of a stay bar device of the vehicle according to the preferred embodiment of the present application.

[0050] Figure 3A and Figure 3B are enlarged views of the local positions of Figure 2 in different states.

[0051] Figure 4 is a partial view of a drive circuit of an electric tailgate control system according to a preferred embodiment of the present application.

[0052] Figure 5 is a flowchart of an electric tailgate control method according to a preferred embodiment of the present application.

[0053] Figure 6 is a flowchart of an electric tailgate control method according to a preferred embodiment of the present application. DETAILED DESCRIPTION

[0054] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The application is capable of other embodiments and of being practiced or being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of "including," "comprising" or "having" and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless specified or limited otherwise, the terms "mounted," "connected," "supported," and "coupled" and variations thereof are used broadly and encompass both direct and indirect mountings, connections, supports, and couplings. Further, "connected" and "coupled" are not restricted to physical or mechanical connections or couplings.

[0055] Also, in the disclosure of the present application, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the above terms cannot be understood as limiting the present application. In the second aspect, the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as limiting the number.

[0056] Reference is made to the accompanying drawings that form a part of this specification Figures 1 to 3B, a vehicle according to a preferred embodiment of the present application will be disclosed and described in the following description, wherein the vehicle comprises a vehicle body 10 and an electric tailgate 20, the electric tailgate 20 further comprises a tailgate 21 and at least one strutting rod device 22, the tailgate 21 is hinged to the vehicle body 10, one end of the strutting rod device 22 is rotatably mounted to the vehicle body 10, the other end of the strutting rod device 22 is rotatably mounted to the tailgate 21, wherein when the strutting rod device 22 starts to stretch, the strutting rod device 22 drives the tailgate 21 to rotate relative to the vehicle body 10 to allow the tailgate 21 to convert from a closed door state to an open door state to open the trunk opening of the trunk of the vehicle body 10, correspondingly, when the strutting rod device 22 starts to contract, the strutting rod device 22 drives the tailgate 21 to rotate relative to the vehicle body 10 to allow the tailgate 21 to convert from the open door state to the closed door state to close the trunk opening of the trunk of the vehicle body 10. It is worth mentioning that the electric energy allowing the strutting rod device 22 to stretch or contract is derived from a vehicle battery 101 of the vehicle body 10, that is, the vehicle battery 101 of the vehicle body 10 can provide electric energy for the strutting rod device 22 to allow the strutting rod device 22 to stretch to open the trunk opening of the trunk of the vehicle body 10, or to allow the strutting rod device 22 to contract to close the trunk opening of the trunk of the vehicle body 10.

[0057] Specifically, now turning to the drawings in which Figures 2 to 3B The strutting rod device 22 comprises a housing 221, a driving assembly 222 and a telescopic pipe 223.

[0058] The housing 221 comprises a first end housing 2211 and a second end housing 2212, wherein the first end housing 2211 has a motor cavity 22111 and an axle hole 22112 communicating with the motor cavity 22111 at the top end of the first end housing 2211, wherein the second end housing 2212 has a telescopic cavity 22121 and a bottom end opening 22122 communicating with the telescopic cavity 22121 at the bottom end of the second end housing 2212, a top end opening 22123 communicating with the telescopic cavity 22121 at the top end of the second end housing 2212, wherein the first end housing 2211 and the second end housing 2212 are mounted to each other in a manner that the axle hole 22112 of the first end housing 2211 and the bottom end opening 22122 of the second end housing 2212 correspond and communicate.

[0059] It is worth mentioning that, in order to facilitate the assembly of the strutting rod device 22, the first end housing 2211 can be composed of two or more housings, and the second end housing 2212 can also be composed of two or more housings.

[0060] The driving assembly 222 comprises a driving motor 2221 and a rotating rod 2222, wherein the driving motor 2221 is fixedly installed in the motor cavity 22111 of the first end shell 2211, and one end of the rotating rod 2222 is rotatably installed in the telescopic cavity 22121 of the second end shell 2212, and the other end of the rotating rod 2222 extends to the motor cavity 22111 of the first end shell 2211 through the bottom opening 22122 of the second end shell 2212 and the shaft hole 22112 of the first end shell 2211 in sequence, so as to be drivably connected to the driving motor 2221. When the vehicle battery 101 of the vehicle body 10 provides electric energy for the driving motor 2221, the driving motor 2221 can drive the rotating rod 2222 to rotate in the telescopic cavity 22121 of the second end shell 2212.

[0061] The telescopic pipe 223 has a pipe hole 2231 and a pipe opening 2232 connected to the pipe hole 2231, and the telescopic pipe 223 has a pipe installation end 2233 and a pipe driven end 2234 corresponding to the pipe installation end 2233. The pipe installation end 2233 of the telescopic pipe 223 can be installed in one of the vehicle body 10 and the tail door 21, the pipe driven end 2234 of the telescopic pipe 223 extends to the telescopic cavity 22121 through the top opening 22123 of the second end shell 2212, the end of the rotating rod 2222 installed in the telescopic cavity 22121 of the second end shell 2212 is allowed to extend to the pipe hole 2231 through the pipe opening 2232 of the telescopic pipe 223, and the external thread structure of the rotating rod 2222 and the internal thread structure of the telescopic pipe 223 are matched with each other, so as to allow the telescopic pipe 223 to be drivably connected to the rotating rod 2222.

[0062] When the vehicle battery 101 of the vehicle body 10 is controlled to output a first direction current to the drive motor 2221, the drive motor 2221 drives the rotating rod 2222 to rotate in a forward direction, at this time, the external thread structure of the rotating rod 2222 and the internal thread structure of the telescopic pipe 223 cooperate with each other to drive the telescopic pipe 223 to extend outward to increase the length of the strut device 22, so as to make the strut device 22 stretch, and in the process of stretching, the strut device 22 allows the tail door 21 to switch from the closed state to the open state to open the trunk of the vehicle body 10. Correspondingly, when the vehicle battery 101 of the vehicle body 10 is controlled to output a second direction current to the drive motor 2221, the drive motor 2221 drives the rotating rod 2222 to rotate in a reverse direction, at this time, the external thread structure of the rotating rod 2222 and the internal thread structure of the telescopic pipe 223 cooperate with each other to drive the telescopic pipe 223 to shrink inward to reduce the length of the strut device 22, so as to make the strut device 22 shrink, and in the process of shrinking, the strut device 22 allows the tail door 21 to switch from the open state to the closed state to close the trunk of the vehicle body 10.

[0063] It can be understood that, by providing the external thread structure on the rotating rod 2222, the internal thread structure on the telescopic pipe 223, and the external thread structure of the rotating rod 2222 and the internal thread structure of the telescopic pipe 223 cooperating with each other, the strut device 22 can convert the rotating motion of the rotating rod 2222 into the axial motion of the telescopic pipe 223, so that the strut device 22 can stretch or shrink to make the tail door 21 open or close the trunk of the vehicle body 10.

[0064] With reference to the accompanying drawings Figure 2, the support rod device 22 further comprises a reset element 224, wherein the reset element 224 is located inside the telescopic cavity 22121 of the second end shell 2212, and one end of the reset element 224 abuts against the inner wall of the second end shell 2212 for forming the telescopic cavity 22121, and the other end of the reset element 224 abuts against the pipe driven end 2234 of the telescopic pipe 223, so that when the support rod device 22 is stretched, the rotating rod 2222 and the second end shell 2212 squeeze the reset element 224 to make it elastically deform, and when the support rod device 22 is retracted, the reset element 224 in the original state can assist the telescopic pipe 223 to smoothly retract. And no matter when the support rod device 22 is stretched or retracted, the reset element 224 can absorb vibration to provide buffering and play a protective role for the support rod device 22, especially for the external thread structure of the rotating rod 2222 and the internal thread structure of the telescopic pipe 223.

[0065] Preferably, the reset element 224 is a compression spring, which is sleeved on the telescopic pipe 223, so that the opposite ends of the reset element 224 can reliably abut against the inner wall of the second end shell 2212 for forming the telescopic cavity 22121 and the pipe driven end 2234 of the telescopic pipe 223 no matter when the support rod device 22 is stretched or retracted.

[0066] Continuing to refer to the drawings Figures 2 to 3B , the drive assembly 222 further comprises a reduction gear box 2223, wherein the box body of the reduction gear box 2223 is fixedly installed in the motor cavity 22111 of the first end shell 2211, and the rotor of the drive motor 2221 is fixedly installed in a gear in the reduction gear box 2223, and one end of the rotating rod 2222 is fixedly installed in another gear in the reduction gear box 2223, so that the end of the rotating rod 2222 is drivably installed on the drive motor 2221 through the reduction gear box 2223.

[0067] Continuing to refer to the drawings Figures 2 to 3B , the drive assembly 222 further comprises two bearings 2224, wherein the two bearings 2224 are installed between the first end shell 2211 and the rotating rod 2222 in the motor cavity 22111 of the first end shell 2211 in a spaced-apart manner, so as to avoid the rotating rod 2222 from shaking when the drive motor 2221 drives the rotating rod 2222 to rotate through the reduction gear box 2223, thereby ensuring the stability of the support rod device 22.

[0068] With reference to the drawings again, Figures 2 to 3B The first end housing 2211 further has a water collecting cavity 22113 and at least one water draining passage 22114 in the sidewall of the first end housing 2211 communicating with the water collecting cavity 22113, the motor cavity 22111 and the shaft hole 22112 are respectively communicated with the water collecting cavity 22113 at the bottom and the top of the water collecting cavity 22113. The support rod device 22 further comprises a sealing unit 224, wherein the sealing unit 224 is arranged in the water collecting cavity 22113 of the first end housing 2211 and exposes at least a portion of the inner opening of the water draining passage 22114 of the first end housing 2211 to allow the rainwater entering the water collecting cavity 22113 through the shaft hole 22112 of the first end housing 2211 to further drain out through the water draining passage 22114, thereby avoiding the rainwater entering the motor cavity 22111 of the first end housing 2211 to achieve the purpose of protecting the driving motor 2221.

[0069] Specifically, the sealing unit 224 comprises a first sealing ring 2241, the inner diameter of the first sealing ring 2241 is smaller than the outer diameter of the rotating rod 2222 to allow the first sealing ring 2241 to be reliably sleeved on the rotating rod 2222 to avoid forming a gap between the first sealing ring 2241 and the rotating rod 2222, the outer diameter of the first sealing ring 2241 is larger than the inner diameter of the water collecting cavity 22113 of the first end housing 2211 to allow the first sealing ring 2241 to be reliably installed in the water collecting cavity 22113 of the first end housing 2211 to avoid forming a gap between the first sealing ring 2241 and the first end housing 2211, wherein the portion of the first sealing ring 2241 contacting the rotating rod 2222 and the portion of the first sealing ring 2241 contacting the first end housing 2211 are made of oil-containing rubber material, which can be oil-containing rubber or oil-containing silicone, so that when the rotating rod 2222 is driven to rotate relative to the first end housing 2211, the first sealing ring 2241 can seep out oil to increase the wear resistance of the first sealing ring 2241.

[0070] Preferably, the sealing unit 224 comprises a second sealing ring 2242, the inner diameter of the second sealing ring 2242 is smaller than the outer diameter of the rotating rod 2222 to allow the second sealing ring 2242 to be reliably sleeved on the rotating rod 2222 to avoid a gap between the second sealing ring 2242 and the rotating rod 2222, the outer diameter of the second sealing ring 2242 is larger than the inner diameter of the water collecting cavity 22113 of the first end shell 2211 to allow the second sealing ring 2242 to be reliably installed on the water collecting cavity 22113 of the first end shell 2211 to avoid a gap between the second sealing ring 2242 and the first end shell 2211, wherein the part of the second sealing ring 2242 contacting the rotating rod 2222 and the part of the second sealing ring 2242 contacting the first end shell 2211 are made of oil-containing rubber, which can be oil-containing rubber or oil-containing silicone, so that the second sealing ring 2242 can seep oil when the rotating rod 2222 is driven to rotate relative to the first end shell 2211, to increase the wear resistance of the second sealing ring 2242.

[0071] By sequentially arranging the second sealing ring 2242 and the first sealing ring 2241 between the first end shell 2211 and the rotating rod 2222, the sealing effect of the sealing unit 224 can be further guaranteed. Preferably, the top surface of the first sealing ring 2241 (i.e., the part of the first sealing ring 2241 contacting the second sealing ring 2242) and the bottom surface of the second sealing ring 2242 (i.e., the part of the second sealing ring 2242 contacting the first sealing ring 2241) are made of oil-containing rubber to increase the wear resistance of the top surface of the first sealing ring 2241 and the bottom surface of the second sealing ring 2242. Preferably, the top surface of the second sealing ring 2242 is an arc surface, the edge height of which is lower than the middle height, to guide the rainwater entering the water collecting cavity 22113 through the shaft hole 22112 of the first end shell 2211 to further be discharged through the drainage channel 22114.

[0072] With reference to the accompanying drawings Figure 3A and Figure 3BThe sealing unit 224 further comprises a resilient abutting element 2243, which is arranged in the water collecting cavity 22113 of the first end shell 2211, and the top end of the abutting element 2243 abuts against the inner wall of the first end shell 2211 for forming the water collecting cavity 22113, and the bottom end of the abutting element 2243 abuts against the top surface of the second sealing ring 2242, so as to press the second sealing ring 2242 towards the first sealing ring 2241 by the abutting element 2243. In this way, even if the outer wall and / or the inner wall of the second sealing ring 2242 are worn, the abutting element 2243 and the first sealing ring 2241 can reduce the inner diameter of the second sealing ring 2242 by pressing the second sealing ring 2242, so as to keep the inner wall of the second sealing ring 2242 always close to the outer wall of the rotating rod 2222, and increase the outer diameter of the second sealing ring 2242, so as to keep the outer wall of the second sealing ring 2242 always close to the inner wall of the first end shell 2211, thereby ensuring the sealing of the supporting rod device 22.

[0073] Preferably, the abutting element 2243 is a compression spring, and the inner diameter of the abutting element 2243 is greater than the outer diameter of the rotating rod 2222, wherein the abutting element 2243 is sleeved on the rotating rod 2222, so as to ensure the position stability of the abutting element 2243, i.e. by sleeving the abutting element 2243 on the rotating rod 2222, the top end of the abutting element 2243 can reliably abut against the inner wall of the first end shell 2211 for forming the water collecting cavity 22113, and the bottom end of the abutting element 2243 can reliably abut against the top surface of the second sealing ring 2242.

[0074] Further, with continuous reference to the drawings, Figure 3A and Figure 3B The second sealing ring 2242 is allowed to move along the rotating rod 2222, so as to avoid rainwater staying in the water collecting cavity 22113 of the first end shell 2211 for a long time by shaking off the rainwater.

[0075] Specifically, the inside of the first sealing ring 2241 is embedded with a coil 22411, which can be powered by the vehicle battery 101 of the vehicle body 10 to generate an electromagnetic field. In a typical example, first, the coil 22411 is placed in a mold, second, rubber mixed with oil (e.g., liquid rubber) is injected into the mold, and the rubber is allowed to wrap the coil 22411, and third, after the rubber is cured and formed, the first sealing ring 2241 is demolded. In this specific example of the strut device 22 of the present application, since the first sealing ring 2241 is built-in with the coil 22411 and the coil 22411 needs to be electrically connected to the vehicle battery 101 of the vehicle body 10, the first sealing ring 2241 needs to be fixedly installed on the first end shell 2211 to avoid the rotation of the rotating rod 2222 driving the first sealing ring 2241 to rotate relative to the first end shell 2211 when the driving motor 2221 drives the rotating rod 2222 to rotate through the reduction gear box 2223, thereby ensuring the electrical connection relationship between the coil 22411 of the first sealing ring 2241 and the vehicle battery 101 of the vehicle body 10. The connection method of the first sealing ring 2241 and the first end shell 2211 can be, but is not limited to, rivets.

[0076] Correspondingly, the inside of the second sealing ring 2242 is embedded with a magnet 22421. In a typical example, first, the magnet 22421 is placed in a mold, second, rubber mixed with oil (e.g., liquid rubber) is injected into the mold, and the rubber is allowed to wrap the magnet 22421, and third, after the rubber is cured and formed, the second sealing ring 2242 is demolded.

[0077] When the vehicle battery 101 of the vehicle body 10 is controlled to start supplying power to the coil 22411 of the first sealing ring 2241 to allow the coil 22411 to generate electromagnetic field, the electromagnetic field generated by the coil 22411 and the magnetic field of the magnet 22421 interact with each other to drive the second sealing ring 2242 to move upward along the rotating rod 2222, in the process, the second sealing ring 2242 and the first end shell 2211 squeeze the abutting element 2243 to make it continue to have elastic potential energy. When the vehicle battery 101 of the vehicle body 10 is controlled to stop supplying power to the coil 22411 of the first sealing ring 2241 to prevent the coil 22411 from generating electromagnetic field, the abutting element 2243 can drive the second sealing ring 2242 to move downward along the rotating rod 2222 in the process of returning to the initial state. It can be understood that the repulsive force generated by the interaction of the electromagnetic field generated by the coil 22411 and the magnetic field of the magnet 22421 needs to be greater than the sum of the friction between the inner wall of the second sealing ring 2242 and the outer wall of the rotating rod 2222, the friction between the outer wall of the second sealing ring 2242 and the inner wall of the first end shell 2211, and the compression resistance of the abutting element 2243, which can be achieved by selecting the number of turns of the coil 22411 and the strength of the magnet 22421.

[0078] Preferably, the speed of the second sealing ring 2242 moving upward along the rotating rod 2222 is greater than the speed of the second sealing ring 2242 moving downward along the rotating rod 2222, and the effect of shaking off rainwater can be achieved by repeatedly driving the second sealing ring 2242 to move upward and downward along the rotating rod 2222.

[0079] Now turning to the drawings Figure 1 And Figure 4 The vehicle further comprises a controller 30 and a driving circuit 40, the controller 30 and the driving circuit 40 are respectively arranged in the vehicle body 10, and the controller 30, the vehicle battery 101 and the driving motor 2221 are respectively connected to the driving circuit 40, so that the controller 30 controls the state of the vehicle battery 101 supplying power to the driving motor 2221 through the driving circuit 40.

[0080] It is worth mentioning that the specific way of arranging the driving circuit 40 in the vehicle body 10 is not limited in the vehicle of the present application, for example, the driving circuit 40 can be formed on a circuit board by etching or printing process, and the driving circuit 40 can be arranged in the vehicle body 10 by installing the circuit board in the vehicle body 10.

[0081] It is also worth mentioning that the specific type of the driving circuit 40 is not limited in the vehicle of the present application, for example, in the attached Figure 4 In this specific example shown, the driving circuit 40 can be an H-bridge circuit.

[0082] It can be understood that the controller 30, the driving circuit 40, the tailgate 21, the vehicle battery 101 and the driving motor 2221 can form an electric tailgate control system to control the state of the electric tailgate 20.

[0083] Specifically, when the vehicle battery 101 is controlled by the controller 30 to output the first direction current to the driving motor 2221 through the driving circuit 40, the driving motor 2221 drives the tailgate 21 to convert from the closed state to the open state to open the trunk of the vehicle body 10. When the vehicle battery 101 is controlled by the controller 30 to output the second direction current to the driving motor 2221 through the driving circuit 40, the driving motor 2221 drives the tailgate 21 to convert from the open state to the closed state to close the trunk of the vehicle body 10.

[0084] More specifically, when the vehicle battery 101 is controlled by the controller 30 to output the first direction current to the driving motor 2221 through the driving circuit 40, the driving motor 2221 drives the rotating rod 2222 to rotate forward, at this time, the outer thread structure of the rotating rod 2222 and the inner thread structure of the telescopic pipe 223 cooperate to drive the telescopic pipe 223 to extend outward to increase the length of the strut device 22, so that the strut device 22 is stretched, and the tailgate 21 is allowed to convert from the closed state to the open state to open the trunk of the vehicle body 10 during the stretching of the strut device 22. When the vehicle battery 101 is controlled by the controller 30 to output the second direction current to the driving motor 2221 through the driving circuit 40, the driving motor 2221 drives the rotating rod 2222 to rotate reversely, at this time, the outer thread structure of the rotating rod 2222 and the inner thread structure of the telescopic pipe 223 cooperate to drive the telescopic pipe 223 to contract inward to reduce the length of the strut device 22, so that the strut device 22 is contracted, and the tailgate 21 is allowed to convert from the open state to the closed state to close the trunk of the vehicle body 10 during the contraction of the strut device 22.

[0085] Preferably, the electric tailgate control system of the present application provides a manual mode to allow a user to manually close the tailgate 21. In other words, when the tailgate 21 is in the open door state, a user is allowed to manually operate the tailgate 21 to transition from the open door state to the closed door state. Correspondingly, when the tailgate 21 is in the closed door state, a user is also allowed to manually operate the tailgate 21 to transition from the closed door state to the open door state. The focus of the present application discussed in the following is how to protect the drive motor 2221, the reduction gear box 2223, and the outer threaded structure of the rotating rod 2222 and the inner threaded structure of the telescopic tube 223 when the tailgate 21 is manually operated to transition from the open door state to the closed door state, to ensure the reliability of the strut device 22 and extend the service life of the strut device 22.

[0086] It can be understood that when the tailgate 21 is manually operated to transition from the open door state to the closed door state, the tailgate 21 drives the telescopic tube 223 to contract inward, due to the cooperation of the outer threaded structure of the rotating rod 2222 and the inner threaded structure of the telescopic tube 223, the telescopic tube 223 drives the rotating rod 2222 to rotate, and the rotating rod 2222 drives the rotor of the drive motor 2221 to rotate through the reduction gear box 2223.

[0087] It can also be understood that the faster the tailgate 21 is manually operated to transition from the open door state to the closed door state, the faster the tailgate 21 drives the telescopic tube 223 to contract inward, the faster the telescopic tube 223 drives the rotating rod 2222 to rotate, and the faster the rotating rod 2222 drives the rotor of the drive motor 2221 to rotate through the reduction gear box 2223. When the speed at which the tailgate 21 is manually operated to transition from the open door state to the closed door state is greater than a safe speed, the drive motor 2221, the reduction gear box 2223, and the outer threaded structure of the rotating rod 2222 and the inner threaded structure of the telescopic tube 223 are prone to be damaged. When a user uses greater force to close the tailgate 21, for example, when the tailgate 21 is slammed by a user, the closing speed of the tailgate 21 is likely to exceed the safe speed, resulting in a risk of damage to the drive motor 2221, the reduction gear box 2223, and the outer threaded structure of the rotating rod 2222 and the inner threaded structure of the telescopic tube 223.

[0088] To solve the problem, in the electric tailgate control system of the present application, the controller 30 outputs the induced current generated by the drive motor 2221 to the drive motor 2221 through the drive circuit 40 when the tailgate 21 is being manually closed, i.e., the induced current generated by the drive motor 2221 is consumed inside the drive motor 2221, to increase the resistance of the tailgate 21 when it is being manually closed, so that the electric tailgate control system provides the electric tailgate 20 with the anti-broken protection function. In other words, during the process of manually closing the tailgate 21, the electric tailgate control system can prevent the speed of the tailgate 21 when it is manually operated from the open state to the closed state from being greater than the safe speed by allowing the induced current generated by the drive motor 2221 to be consumed inside the drive motor 2221, thereby providing the electric tailgate 20 with the anti-broken protection function. The way the controller 30 outputs the induced current to the drive motor 2221 through the drive circuit 40 can be intermittent, i.e., the controller 30 controls the drive circuit 40 to intermittently output the induced current to the drive motor 2221.

[0089] In addition, the electric tailgate control system allows the induced current generated by the drive motor 2221 to be consumed inside the drive motor 2221 without the need to add other structures to provide the electric tailgate 20 with the anti-broken protection function, which is beneficial to simplify the structure of the strut device 22 and improve the reliability of the strut device 22, while being beneficial to reduce the size of the strut device 22. At the same time, the electric tailgate control system provides resistance by allowing the induced current generated by the drive motor 2221 to be consumed inside the drive motor 2221 to prevent the speed of the tailgate 21 when it is being manually closed from being less than the safe speed, so that the harder the user manually closes the tailgate 21, the greater the resistance the drive motor 2221 can provide, so that the electric tailgate control system of the present application can effectively provide the electric tailgate 20 with the anti-broken protection function.

[0090] It can be understood that the safe speed of the tail door 21 when being closed is a design value, which can be obtained by means of aging test on the stay device 22. In order to improve the experience of the user when manually closing the tail door 21, the electric tail door control system of the present application provides a first preset threshold value, which is less than the design value. When the user uses a smaller force to close the tail door 21, the closing speed of the tail door 21 is less than the first preset threshold value, at which time the electric tail door control system does not need to provide resistance, that is, the controller 30 prevents the drive circuit 40 from outputting induced current to the drive motor 2221, accordingly, when the user uses a larger force to close the tail door 21, the closing speed of the tail door 21 is greater than the first preset threshold value and there is a risk of exceeding the design value, at which time the controller 30 provides resistance by means of the drive circuit 40 outputting induced current to the drive motor 2221 to provide the electric tail door 20 with anti-broken protection, so that the electric tail door control system can improve user experience while providing the electric tail door with anti-broken protection.

[0091] When the tail door 21 is manually closed, the electric tail door control system of the present application detects the speed of the tail door 21 when being manually closed by means of detecting the current value of the induced current generated by the drive motor 2221, so as to subsequently judge whether the closing speed of the tail door 21 is greater than the first preset threshold value. It can be understood that the current value of the induced current generated by the drive motor 2221 is positively correlated with the speed of the tail door 21 when being manually closed, the faster the tail door 21 is manually closed, the greater the current value of the induced current generated by the drive motor 2221, accordingly, the slower the tail door 21 is manually closed, the smaller the current value of the induced current generated by the drive motor 2221, therefore, the electric tail door control system of the present application can detect the speed of the tail door 21 when being manually closed by means of detecting the current value of the induced current generated by the drive motor 2221, so that the closing speed of the tail door 21 can be obtained without the need to set a special speed detection structure, which is crucial for simplifying the structure of the stay device 22, improving the reliability of the stay device 22 and reducing the cost of the stay device 22.

[0092] Preferably, the electric tailgate control system of the present invention further provides a second preset threshold, which is greater than the first preset threshold and less than the design value. When the user closes the tailgate 21 with greater force, the closing speed of the tailgate 21 is greater than the first preset threshold and less than the second preset threshold. At this time, the controller 30 provides resistance by outputting induced current to the drive motor 2221 through the drive circuit 40. Correspondingly, when the user closes the tailgate 21 with even greater force (i.e., when the user violently slams the door), the closing speed of the tailgate 21 is greater than the second preset threshold and there is a risk of exceeding the design value. At this time, the controller 30 further outputs the first directional current provided by the vehicle battery 101 to the drive motor 2221 through the drive circuit 40 to increase the resistance. This is crucial for preventing the closing speed of the tailgate 21 from exceeding the safe speed. The control 30 can output the first directional current provided by the vehicle battery 101 to the drive motor 2221 through the drive circuit 40 in an intermittent manner, that is, the control 30 outputs the first directional current provided by the vehicle battery 101 to the drive motor 2221 intermittently through the drive circuit 40.

[0093] Appendix Figure 5 A preferred embodiment of the present invention, an electric tailgate control method 500, is shown, the electric tailgate control method 500 comprising the following steps:

[0094] Step 510: When the vehicle battery 101 outputs the first directional current to the drive motor 2221 through the drive circuit 40, the drive motor 2221 is allowed to drive the tailgate 21 to switch from the closed state to the open state.

[0095] Step 520: When the vehicle battery 101 outputs the second direction current to the drive motor 2221 through the drive circuit 40, the drive motor 2221 is allowed to drive the tailgate 21 to switch from the open state to the closed state.

[0096] Step 530: When the vehicle battery 101 is not outputting current to the drive motor 2221 through the drive circuit 40, the tailgate 21, which has switched from the open state to the closed state, drives the rotor of the drive motor 2221 to rotate, so that the drive motor 2221 generates an induced current; and

[0097] Step 540, output the induced current to the driving motor 2221 through the driving circuit 40 to increase the resistance when the tail door 21 is switching from the open door state to the closed door state, so that the electric tail door control method 500 can provide the anti-falling protection for the electric tail door 20.

[0098] Further, before the step 540, the electric tail door control method 500 can further include the step of judging whether the speed of the tail door 21 when switching from the open door state to the closed door state is greater than the first preset threshold value, and output the induced current to the driving motor 2221 through the driving circuit 40 when the speed of the tail door 21 when switching from the open door state to the closed door state is greater than the first preset threshold value.

[0099] Still further, the above method includes the following steps:

[0100] Collecting the induced current generated by the driving motor 2221;

[0101] Determining the speed of the tail door 21 when switching from the open door state to the closed door state according to the current value of the induced current of the driving motor 2221; and

[0102] Comparing the speed of the tail door 21 when switching from the open door state to the closed door state with the first preset threshold value to determine whether the speed of the tail door 21 when switching from the open door state to the closed door state is greater than the first preset threshold value.

[0103] Preferably, in the step 540, the vehicle battery 101 outputs the first direction current to the driving motor 2221 through the driving circuit 40 to further increase the resistance when the tail door 21 is switching from the open door state to the closed door state, which is crucial to avoid the closing speed of the tail door 21 exceeding the safe speed.

[0104] Further, before the step 540, the electric tail door control method 500 can further include the step of judging whether the speed of the tail door 21 when switching from the open door state to the closed door state is greater than the second preset threshold value, and output the first direction current to the driving motor 2221 through the driving circuit 40 when the speed of the tail door 21 when switching from the open door state to the closed door state is greater than the second preset threshold value.

[0105] Still further, the above method includes the following steps:

[0106] Collecting the induced current generated by the driving motor 2221;

[0107] determine the speed of the tailgate 21 when switching from the open state to the closed state according to the current value of the induced current of the driving motor 2221; and

[0108] compare the speed of the tailgate 21 when switching from the open state to the closed state with the second preset threshold value to determine whether the speed of the tailgate 21 when switching from the open state to the closed state is greater than the second preset threshold value.

[0109] attached Figure 6 The working flow of the electric tailgate control method 500 is shown. Specifically, when the tailgate 21 is manually closed, it is determined whether the speed of the tailgate 21 when manually closed is greater than the first preset threshold value. If the speed of the tailgate 21 when manually closed is less than the first preset threshold value, the driving motor 2221 is maintained in the power-off state to prevent the driving motor 2221 from providing resistance. If the speed of the tailgate 21 when manually closed is greater than the first preset threshold value, the driving motor 2221 is supplied with induced current (i.e., the controller 30 outputs the induced current generated by the driving motor 2221 itself to the driving motor 2221 through the driving circuit 40) to allow the driving motor 2221 to provide resistance. At the same time, it is determined whether the speed of the tailgate 21 when manually closed is greater than the second preset threshold value. If the speed of the tailgate 21 when manually closed is less than the second preset threshold value, the driving motor 2221 is only supplied with induced current to provide smaller resistance. If the speed of the tailgate 21 when manually closed is greater than the second preset threshold value, the driving motor 2221 is further supplied with the first direction current provided by the vehicle battery 101 to further increase the resistance of the driving motor 2221, which is crucial to avoid the closing speed of the tailgate 21 exceeding the safe speed.

[0110] It should be understood by those skilled in the art that the above description and the embodiments of the application shown in the drawings are only examples and do not limit the application. The purpose of the application has been fully and effectively achieved. The function and structural principle of the application has been shown and explained in the embodiments, and the implementation of the application can be any modification or modification without departing from the principle.

Claims

1. A method of controlling an electric tailgate, characterized by, The electric tailgate includes a tailgate and a support rod device rotatably mounted to the tailgate, wherein the support rod device includes a housing, a driving assembly, a telescopic pipe and a sealing unit, the housing includes a first end housing and a second end housing, the first end housing has a motor cavity, a shaft hole, a water collecting cavity and at least one water draining passage, the motor cavity and the shaft hole are communicated with the water collecting cavity at the bottom and the top of the water collecting cavity respectively, the water draining passage is communicated with the water collecting cavity at the side wall of the first end housing, the second end housing has a telescopic cavity and a bottom end opening and a top end opening communicated with the telescopic cavity respectively, the first end housing and the second end housing are mounted to each other in a manner that the shaft hole and the bottom end opening correspond to and communicate with each other, the driving assembly includes a driving motor and a rotating rod, the driving motor is fixedly mounted to the motor cavity of the first end housing, one end of the rotating rod is rotatably mounted to the telescopic cavity of the second end housing, the other end extends to the motor cavity of the first end housing through the bottom end opening of the second end housing and the shaft hole of the first end housing to be drivably connected to the driving motor, the telescopic pipe has a pipe hole and a pipe opening communicated with the pipe hole, the driven end of the telescopic pipe extends to the telescopic cavity through the top end opening of the second end housing, the end of the rotating rod mounted to the telescopic cavity of the second end housing is allowed to extend to the pipe hole through the pipe opening of the telescopic pipe, and the external thread structure of the rotating rod and the internal thread structure of the telescopic pipe are matched with each other to allow the telescopic pipe to be drivably connected to the rotating rod, the sealing unit includes a first sealing ring, a second sealing ring and an abutting element, the first sealing ring and the second sealing ring are sleeved on the rotating rod respectively, and the inner diameters of the first sealing ring and the second sealing ring are smaller than the outer diameter of the rotating rod, the outer diameters of the first sealing ring and the second sealing ring are larger than the inner diameter of the water collecting cavity of the first end housing, the top end of the abutting element abuts against the inner wall of the first end housing for forming the water collecting cavity, and the bottom end abuts against the top surface of the second sealing ring to press the second sealing ring towards the first sealing ring, wherein the second sealing ring is allowed to move along the rotating rod to avoid rainwater staying in the water collecting cavity of the first end housing for a long time in a manner of shaking off the rainwater; wherein the electric tailgate control method includes the following steps: (a) when a vehicle battery outputs a first direction current to the driving motor through a driving circuit, allowing the driving motor to drive the tailgate to switch from a closed door state to an open door state; (b) when the vehicle battery outputs a second direction current to the driving motor through the driving circuit, allowing the driving motor to drive the tailgate to switch from the open door state to the closed door state; (c) when the vehicle battery does not output current to the drive motor through the drive circuit, the tailgate switches from the open door state to the closed door state and drives the rotor of the drive motor to rotate to make the drive motor generate induced current; and (d) the drive circuit outputs induced current to the drive motor to increase the resistance when the tailgate switches from the open door state to the closed door state.

2. The electric tailgate control method of claim 1, wherein in the step (d), the vehicle battery outputs the first direction current to the drive motor through the drive circuit to further increase the resistance when the tailgate switches from the open door state to the closed door state.

3. The electric tailgate control method of claim 1, wherein in the step (d), the drive circuit outputs induced current to the drive motor intermittently.

4. The electric tailgate control method of claim 2, wherein in the step (d), the vehicle battery outputs the first direction current to the drive motor through the drive circuit intermittently.

5. The electric tailgate control method of any one of claims 1 to 4, wherein before the step (d), the electric tailgate control method further comprises a step of: (e) determining whether the speed of the tailgate when switching from the open door state to the closed door state is greater than a first preset threshold, and when the speed of the tailgate when switching from the open door state to the closed door state is greater than the first preset threshold, the drive circuit outputs induced current to the drive motor.

6. The electric tailgate control method of claim 2 or 4, wherein before the step (d), the electric tailgate control method further comprises a step of: (f) determining whether the speed of the tailgate when switching from the open door state to the closed door state is greater than a second preset threshold, and when the speed of the tailgate when switching from the open door state to the closed door state is greater than the second preset threshold, the vehicle battery outputs the first direction current to the drive motor through the drive circuit.

7. The electric tailgate control method of claim 5, wherein the step (e) further comprises steps of: (e.1) collecting the induced current generated by the drive motor; (e.2) determining the speed of the tailgate when switching from the open door state to the closed door state according to the current value of the induced current of the drive motor; and (e.3) comparing the speed of the tailgate when switching from the open door state to the closed door state with the first preset threshold to determine whether the speed of the tailgate when switching from the open door state to the closed door state is greater than the first preset threshold.

8. The electric tailgate control method of claim 6, wherein the step (f) further comprises steps of: (f.1) collecting the induced current generated by the drive motor; (f.2) determining the speed of the tailgate when switching from the open door state to the closed door state according to the current value of the induced current of the drive motor; and (f.3) comparing the speed of the tailgate when switching from the open door state to the closed door state with the second preset threshold to determine whether the speed of the tailgate when switching from the open door state to the closed door state is greater than the second preset threshold. (f.3) comparing the speed of the tailgate switching from the open state to the closed state with the second preset threshold value to determine whether the speed of the tailgate switching from the open state to the closed state is greater than the second preset threshold value.

9. The electric tailgate control method of claim 1, wherein an inside of the first sealing ring is embedded with a coil, the coil is connected to the vehicle battery, an inside of the second sealing ring is embedded with a magnet, when the coil of the first sealing ring is powered to generate an electromagnetic field, the electromagnetic field generated by the coil and the magnetic field of the magnet interact to drive the second sealing ring to move upward along the rotating rod, when the coil of the first sealing ring is stopped from being powered, the abutting element drives the second sealing ring to move downward along the rotating rod in the process of returning to the initial state, wherein the speed of the second sealing ring moving upward along the rotating rod is greater than the speed of moving downward.

10. An electric tailgate control system characterized by, comprising: a controller; a vehicle battery; a driving motor; a tailgate, wherein the tailgate is drivingly connected to the driving motor; a driving circuit, wherein the driving circuit is arranged to be connected to the vehicle battery, the driving motor and the controller, so that the state of the vehicle battery supplying power to the driving motor through the driving circuit is controlled by the controller; and ​ At least one stay device is rotatably mounted to the tail door, and the stay device comprises a housing, a driving assembly, a telescopic pipe and a sealing unit. The housing comprises a first end housing and a second end housing. The first end housing has a motor cavity, a shaft hole, a water collecting cavity and at least one water draining passage. The motor cavity and the shaft hole are communicated with the water collecting cavity at the bottom and the top of the water collecting cavity respectively. The water draining passage is communicated with the water collecting cavity at the sidewall of the first end housing. The second end housing has a telescopic cavity and a bottom end opening and a top end opening communicated with the telescopic cavity respectively. The first end housing and the second end housing are mounted to each other in a manner that the shaft hole and the bottom end opening correspond to and communicate with each other. The driving assembly comprises a driving motor and a rotating rod. The driving motor is fixedly mounted to the motor cavity of the first end housing. One end of the rotating rod is rotatably mounted to the telescopic cavity of the second end housing. The other end of the rotating rod extends to the motor cavity of the first end housing through the bottom end opening of the second end housing and the shaft hole of the first end housing, and is drivably connected to the driving motor. The telescopic pipe has a pipe hole and a pipe opening communicated with the pipe hole. The driven end of the telescopic pipe extends to the telescopic cavity through the top end opening of the second end housing. The end of the rotating rod mounted to the telescopic cavity of the second end housing is allowed to extend to the pipe hole through the pipe opening of the telescopic pipe. The external thread structure of the rotating rod and the internal thread structure of the telescopic pipe are matched with each other to allow the telescopic pipe to be drivably connected to the rotating rod. The sealing unit comprises a first sealing ring, a second sealing ring and an abutting element. The first sealing ring and the second sealing ring are sleeved on the rotating rod respectively. The inner diameters of the first sealing ring and the second sealing ring are smaller than the outer diameter of the rotating rod. The outer diameters of the first sealing ring and the second sealing ring are larger than the inner diameter of the water collecting cavity of the first end housing. The top end of the abutting element abuts against the inner wall of the first end housing for forming the water collecting cavity, and the bottom end abuts against the top surface of the second sealing ring to press the second sealing ring towards the first sealing ring. The second sealing ring is allowed to move along the rotating rod to avoid rainwater staying in the water collecting cavity of the first end housing for a long time in a manner of shaking off rainwater. The controller is configured to perform the following steps: (A) When the vehicle battery outputs a first direction current to the driving motor through the driving circuit, the driving motor drives the tail door to switch from a closed state to an open state; (B) When the vehicle battery outputs a second direction current to the driving motor through the driving circuit, the driving motor drives the tail door to switch from the open state to the closed state. (C) when the vehicle battery does not output current to the drive motor through the drive circuit, the tailgate drives the rotor of the drive motor to rotate to cause the drive motor to generate induced current, during the transition of the tailgate from the open state to the closed state; (D) the drive circuit outputs induced current to the drive motor to increase the resistance when the tailgate transitions from the open state to the closed state.

11. The power tailgate control system of claim 10, wherein in the step (D), the controller controls the vehicle battery to output the first direction current to the drive motor through the drive circuit to further increase the resistance when the tailgate transitions from the open state to the closed state.

12. The power tailgate control system of claim 10, wherein in the step (D), the controller controls the drive circuit to output induced current to the drive motor intermittently.

13. The power tailgate control system of claim 11, wherein in the step (D), the controller controls the vehicle battery to output the first direction current to the drive motor intermittently through the drive circuit.

14. The power tailgate control system of any one of claims 10 to 13, wherein before the step (D), the controller is configured to further perform a step of: (E) determining whether the speed of the tailgate during the transition from the open state to the closed state is greater than a first predetermined threshold, and outputting induced current to the drive motor through the drive circuit when the speed of the tailgate during the transition from the open state to the closed state is greater than the first predetermined threshold.

15. The power tailgate control system of claim 11 or 13, wherein before the step (D), the controller is configured to further perform a step of: (F) determining whether the speed of the tailgate during the transition from the open state to the closed state is greater than a second predetermined threshold, and outputting the first direction current to the drive motor through the drive circuit when the speed of the tailgate during the transition from the open state to the closed state is greater than the second predetermined threshold.

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