Automobile back door anti-pinch control system and method
By installing main and auxiliary electric strut drive modules on both sides of the car's tailgate, and utilizing current signal monitoring and the ECU control unit, the problems of motor damage and obstacle recognition errors have been solved, enabling precise control and normal opening and closing of the tailgate.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- DONGFENG MOTOR GRP
- Filing Date
- 2023-07-28
- Publication Date
- 2026-06-30
AI Technical Summary
Existing anti-pinch technology for car tailgates suffers from problems such as motor damage and obstacle recognition errors, especially in cases of false triggering or non-triggering caused by motor stalling and blind spots in camera monitoring.
The system employs main and auxiliary electric strut drive modules on both sides of the tailgate. The door status is determined by monitoring current signals and the ECU control unit, which then drives the motors to prevent motor stalling and obstacle detection. Hydraulic springs are used to maintain door balance.
It achieves refined obstacle control, reduces motor damage and recognition errors, ensures normal opening and closing of the tailgate, and simplifies monitoring devices and control steps.
Smart Images
Figure CN116927616B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of electric tailgates for automobiles, specifically to an anti-pinch control system and method for automobile tailgates. Background Technology
[0002] With advancements in automotive technology and a desire to improve quality of life, many car tailgates have become electrically operated. Users send commands to the tailgate via remote control, and the tailgate receives these commands and automatically opens or closes via a motor controlled by a program. The tailgate operates in three states: open, closed, and stopped. The opening and closing process is electrically powered. If, during this process, the tailgate is obstructed by human intervention or other reasons, it will not stop but will continue opening or closing according to the original command. This could potentially cause injury to the person obstructing the tailgate or damage to items. Therefore, anti-pinch technology for car tailgates has emerged. When an obstacle (person or other object) obstructs the tailgate's movement during opening or closing, the system detects it and initiates an anti-pinch response, stopping or retracting the tailgate to protect the tailgate system and the obstruction from damage.
[0003] In existing technologies, anti-pinch technology for car tailgates mainly involves detecting motor stall by using the operating current signal of the strut motor, and then stopping the motor after detection; or detecting the pulse width of the anti-pinch strip signal to determine if the anti-pinch is triggered, and then stopping the motor after detection. However, in this technology, the current signal value reflects the damping magnitude or the duration of motor stall during operation, which affects the impact of obstacle collisions and may cause some degree of damage, while also damaging the motor. Another technology uses a rear-facing camera to monitor obstacles behind the tailgate and detect them. This determines whether an obstacle is present and then stops the motor for protection. However, this technology has blind spots in the monitoring video, and the monitoring video requires high precision to determine the position of the obstacle in the tailgate's closing path, making it prone to false detection leading to either false triggering or failure to trigger the anti-pinch system. It also places high demands on computer storage and the algorithm is relatively complex. Summary of the Invention
[0004] To overcome the shortcomings of the prior art, this application provides a car tailgate anti-pinch control system and method, which can identify obstacles on the car tailgate and prevent pinching by monitoring the current signal of the drive strut and the changes in the strut drive motor, thereby reducing the damage caused by the drive motor stalling or continuous operation after encountering an obstacle.
[0005] This invention provides a car tailgate anti-pinch control system, the car tailgate anti-pinch control system comprising:
[0006] The tailgate switch control module is used to control the opening and closing of the car tailgate according to the status of the car tailgate.
[0007] An electric strut drive module is used to drive an electric strut to open or close the tailgate of a car. The electric strut drive module is equipped with an electric strut, which is a motor-driven structure. The tailgate switch control module controls the operation of the electric strut drive module.
[0008] The vehicle tailgate anti-pinch control system includes two sets of electric strut drive modules, respectively located on the left and right sides of the tailgate. One side is a main electric strut drive module, and the other side is a secondary electric strut drive module. Both the main electric strut drive module and the secondary electric strut drive module drive the tailgate when it is opened or closed. When the tailgate is obstructed from opening or closing, the main electric strut drive module stops, and the secondary electric strut drive module operates to maintain the balance of the tailgate.
[0009] According to an embodiment of the present invention, the anti-pinch control system for a car tailgate includes a tailgate opening and closing control module comprising:
[0010] A current detection circuit is used to monitor the current signal of the electric strut drive module;
[0011] A signal monitoring and transmission unit is used to transmit the current signal of the electric strut drive module back to the ECU control unit;
[0012] The ECU control unit controls the electric strut drive module to work based on the current signal detected by the current detection circuit; the ECU control unit determines the different states of the tailgate based on the continuous abrupt changes in the current signal under different states, and controls the electric strut drive module to work according to the preset calibration.
[0013] The ECU control unit is divided into different modes based on the current signal of the tailgate in different states, including: tailgate closed state, tailgate open / closed state, tailgate opening / closing obstructed state, and tailgate hovering state.
[0014] According to the embodiment of the present invention, the preset calibration of the ECU control unit in the automobile tailgate anti-pinch control system includes:
[0015] If the current signal indicates that the tailgate is closed, the electric strut drive module is controlled to not work; if the current signal indicates that the tailgate is open / closed, the electric strut drive module is controlled to work continuously.
[0016] If the current signal indicates that the opening / closing of the tailgate is obstructed, then the power of the electric strut drive module is reduced.
[0017] If the current signal indicates that the rear door is in a suspended state, then the electric strut drive module is controlled to stop working.
[0018] According to the embodiment of the present invention, the electric support rod of the automobile tailgate anti-pinch control system has a hydraulic spring structure to ensure that the electric support rod is used as a hydraulic support rod in the non-motor driven state.
[0019] This invention also provides a control method for an anti-pinch control system for a car's rear tailgate, comprising the following steps:
[0020] When the vehicle is unlocked, the tailgate switch control module enters the working mode and determines the current state of the car's tailgate.
[0021] If the car's tailgate is closed;
[0022] When the tailgate switch control module receives the tailgate opening command, the main electric strut drive module and the auxiliary electric strut drive module start working to drive the electric struts to open the tailgate. The tailgate switch control module continuously monitors the current status in the electric strut drive module.
[0023] If the tailgate switch control module detects that the tailgate current state is in an opening obstruction state, the tailgate switch control module controls the main electric strut drive module to stop working, and the auxiliary electric strut drive module works to maintain the tailgate balance.
[0024] The tailgate switch control module continuously monitors the current status in the electric strut drive module. When the tailgate switch control module detects that the tailgate current status is in the open state, the tailgate switch control module controls the tailgate to continue opening until the tailgate reaches its maximum opening height.
[0025] According to the vehicle tailgate anti-pinch control method provided in the embodiment of the present invention, when the tailgate switch control module receives the tailgate opening command, the main electric strut drive module and the auxiliary electric strut drive module start working, and the step of driving the electric strut to open the tailgate includes:
[0026] The electric struts of the main electric strut drive module and the auxiliary electric strut drive module begin to work;
[0027] The electric strut in the main electric strut drive module applies an upward rotational force to the tailgate, and the current signal of the main electric strut drive module indicates that the tailgate is open; at the same time, the electric strut in the auxiliary electric strut drive module applies an upward rotational force to the tailgate, and the upward rotational force of the electric strut in the auxiliary electric strut drive module is less than the weight of the tailgate.
[0028] When the tailgate of a car encounters an obstacle during opening, the drive current signal of the main drive strut changes, transforming into a tailgate opening obstruction state. The ECU control unit determines that an obstacle has appeared by detecting the current signal through the current detection circuit. The ECU control unit controls the drive motor of the electric strut in the main electric strut drive module to reduce its speed, while the electric strut in the auxiliary electric strut drive module remains working to keep the tailgate in a suspended state.
[0029] The current detection circuit continuously monitors the drive current signal of the main electric strut drive module. Within a preset time period ST1, if the current detection circuit detects that the drive current signal of the main electric strut drive module is still in the state of obstructed tailgate opening, it is determined that the obstacle has not been removed. Then, the ECU control unit controls the drive motors of the main electric strut drive module and the auxiliary electric strut drive module to gradually stop working. If the current detection circuit detects that the drive current signal of the main electric strut drive module tends to be stable, it is determined that the obstacle has been removed. The ECU control unit controls the tailgate to continue opening, and the electric strut opening speed of the main electric strut drive module reaches V1.
[0030] The current detection circuit continuously monitors the drive current signal of the main electric strut drive module and continuously judges the status of the drive current signal of the main electric strut drive module at least 3 times. If the drive current signal of the main electric strut drive module is stable, the ECU control unit controls the electric strut opening speed of the main electric strut drive module to return to the normal speed V. If the drive current signal of the main electric strut drive module experiences a sudden change, the above steps are returned.
[0031] The car's tailgate opens to its maximum height at a normal speed V.
[0032] According to the embodiment of the present invention, the time period ST1 is one second; the speed V1 is between one-third and one-half of the normal speed V.
[0033] According to the embodiments of the present invention, the method for preventing pinching of a car tailgate further includes the following steps in the control method of the car tailgate anti-pinch control system:
[0034] If the car's tailgate is in the open position;
[0035] The ECU control unit monitors the opening and closing status of the car's tailgate in real time. When the ECU control unit receives a tailgate closing command, it closes the tailgate. The current detection circuit continuously detects the current signal in the car's tailgate anti-pinch control system.
[0036] If the current detection circuit detects that the tailgate is blocked from closing, the ECU control unit controls the tailgate to hover, and the current detection circuit continuously detects the current signal in the vehicle tailgate anti-pinch control system.
[0037] The ECU control unit controls the tailgate to continue closing and locking until the current detection circuit detects a current signal indicating that the tailgate is closed.
[0038] According to the anti-pinch control method for a car tailgate provided in an embodiment of the present invention, after receiving a tailgate closing command, the ECU control unit closes the tailgate and completes the tailgate opening action according to the following steps:
[0039] The main electric strut drive module and the auxiliary electric strut drive module drive the motor in opposite directions to drive the electric strut to close the rear door.
[0040] When the tailgate of the car encounters an obstacle during the closing process, the drive current signal of the main electric strut drive module changes, transforming into a tailgate closing obstruction state. The ECU control unit determines that an obstacle has appeared, and controls the drive motor of the auxiliary electric strut drive module to increase the power, so that the tailgate of the car quickly retracts. At the same time, it controls the drive motor of the main electric strut drive module to stop working, and the tailgate of the car moves upward by a distance S1.
[0041] The ECU control unit controls the drive motor of the electric strut in the main electric strut drive module to reduce its speed, while the electric strut in the auxiliary electric strut drive module remains active to keep the tailgate in a suspended state.
[0042] The current detection circuit continuously monitors the drive current signal of the main electric strut drive module. Within a preset time period ST1, if the current detection circuit detects that the drive current signal of the main electric strut drive module is still in the state of obstructed tailgate opening, it is determined that the obstacle has not been removed. Then, the ECU control unit controls the drive motors of the main electric strut drive module and the auxiliary electric strut drive module to gradually stop working. If the current detection circuit detects that the drive current signal of the main electric strut drive module tends to be stable, it is determined that the obstacle has been removed. Then, the ECU control unit controls the electric strut closing speed of the main electric strut drive module to reach V1.
[0043] The current detection circuit continuously monitors the drive current signal of the main electric strut drive module and continuously judges the drive current signal status of the main electric strut drive module at least 3 times. If the drive current signal of the main electric strut drive module is stable, the ECU control unit controls the main electric strut drive module to turn off at a speed that returns to the normal speed V. If the drive current signal of the main electric strut drive module experiences a sudden change, the above steps are returned.
[0044] The car's tailgate closes and locks at a normal speed V.
[0045] According to the embodiment of the present invention, the distance S1 is between 10 cm and 20 cm; the time period ST1 is one second; and the speed V1 is between one-third and one-half of the normal speed V.
[0046] The beneficial effects of this invention are as follows: The anti-pinch control system and method for a car tailgate provided by this invention uses linkage signals between the drive motors of the drive struts located on the left and right sides of the tailgate and the continuous abrupt changes in the drive motor current signal to determine the operating status of the tailgate. This avoids damage to obstacles caused by a continuous increase in the current signal, as well as wear and tear on the motor itself due to stalling. Furthermore, through the drive motors of the drive struts, the signal monitoring and transmission unit, and the identification and judgment mechanism, it achieves refined control over obstacles, reduces the occurrence of drive motor stalling, and ensures that the drive motor continues to run even after the obstacle has moved, guaranteeing the normal opening and closing of the tailgate. The anti-pinch control system and method for a car tailgate provided by this invention simplifies the tailgate monitoring device, reduces the number of cameras, reduces the recognition range of the anti-pinch rubber strip signal, and streamlines the control steps. Attached Figure Description
[0047] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.
[0048] Figure 1 This is a schematic diagram of the structure of the anti-pinch control system for the rear door of an automobile provided in an embodiment of the present invention.
[0049] Figure 2 A flowchart illustrating the anti-pinch control method for the rear door of a car provided in this embodiment of the invention. Detailed Implementation
[0050] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0051] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.
[0052] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.
[0053] like Figure 1 The diagram shown is a schematic representation of the anti-pinch control system for a car tailgate provided in an embodiment of the present invention. The anti-pinch control system for a car tailgate includes:
[0054] The tailgate switch control module is used to control the opening and closing of the car tailgate according to the status of the car tailgate.
[0055] An electric strut drive module is used to drive an electric strut to open or close the tailgate of a car. The electric strut drive module is equipped with an electric strut, which is a motor-driven structure. The tailgate switch control module controls the operation of the electric strut drive module.
[0056] The vehicle tailgate anti-pinch control system includes two sets of electric strut drive modules, respectively located on the left and right sides of the tailgate. One side is a main electric strut drive module, and the other side is a secondary electric strut drive module. Both the main electric strut drive module and the secondary electric strut drive module drive the tailgate when it is opened or closed. When the tailgate is obstructed from opening or closing, the main electric strut drive module stops, and the secondary electric strut drive module operates to maintain the balance of the tailgate.
[0057] In this embodiment, the tailgate switch control module includes:
[0058] A current detection circuit is used to monitor the current signal of the electric strut drive module;
[0059] A signal monitoring and transmission unit is used to transmit the current signal of the electric strut drive module back to the ECU control unit;
[0060] The ECU control unit controls the electric strut drive module to work based on the current signal detected by the current detection circuit; the ECU control unit determines the different states of the tailgate based on the continuous abrupt changes in the current signal under different states, and controls the electric strut drive module to work according to the preset calibration.
[0061] The ECU control unit is divided into different modes based on the current signal of the tailgate in different states, including: tailgate closed state, tailgate open / closed state, tailgate opening / closing obstructed state, and tailgate hovering state.
[0062] Specifically, the preset calibration of the ECU control unit includes:
[0063] If the current signal indicates that the tailgate is closed, the electric strut drive module is controlled to not work; if the current signal indicates that the tailgate is open / closed, the electric strut drive module is controlled to work continuously.
[0064] If the current signal indicates that the opening / closing of the tailgate is obstructed, then the power of the electric strut drive module is reduced.
[0065] If the current signal indicates that the rear door is in a suspended state, then the electric strut drive module is controlled to stop working.
[0066] The electric strut provided in this embodiment, in addition to having a motor drive structure, also includes a hydraulic spring structure to ensure that the electric strut functions as a hydraulic strut in the non-motor-driven state. Specifically, during the opening of the tailgate, the electric strut of the main electric strut drive module applies an upward rotational force to the tailgate. During this process, the drive current of the electric strut of the main electric strut drive module is in a stable state, while the drive current signal of the electric strut of the auxiliary electric strut drive module changes. Furthermore, the driving force applied to the tailgate by the electric strut of the auxiliary electric strut drive module is less than the weight of the tailgate itself. Specifically, the driving force applied to the tailgate by the electric strut of the auxiliary electric strut drive module is between 85% and 95% of the tailgate's weight.
[0067] When the tailgate is obstructed from opening or closing, and the main electric strut drive module stops working, the driving force of the electric strut in the auxiliary electric strut drive module is less than the weight of the tailgate itself. As a result, the tailgate will quickly decelerate and stop during ascent or descent, and then move in the opposite direction a short distance. The drive motor speed of the electric strut in the auxiliary electric strut drive module decreases, and the balance of the tailgate is maintained by a hydraulic spring structure, placing the tailgate in a state of slight movement. Specifically, the reverse movement distance of the tailgate when it is obstructed from opening or closing is set to be between 5 and 10 centimeters.
[0068] like Figure 2 As shown, this embodiment of the invention also provides a control method for the anti-pinch control system for a car tailgate based on the above embodiments, comprising the following steps:
[0069] When the vehicle is unlocked, the tailgate switch control module enters the working mode and determines the current state of the car's tailgate.
[0070] If the car's tailgate is closed;
[0071] When the tailgate switch control module receives the tailgate opening command, the main electric strut drive module and the auxiliary electric strut drive module start working to drive the electric struts to open the tailgate. The tailgate switch control module continuously monitors the current status in the electric strut drive module.
[0072] If the tailgate switch control module detects that the tailgate current state is in an opening obstruction state, the tailgate switch control module controls the main electric strut drive module to stop working, and the auxiliary electric strut drive module works to maintain the tailgate balance.
[0073] The tailgate switch control module continuously monitors the current status in the electric strut drive module. When the tailgate switch control module detects that the tailgate current status is in the open state, the tailgate switch control module controls the tailgate to continue opening until the tailgate reaches its maximum opening height.
[0074] Specifically, when the tailgate switch control module receives a tailgate opening command, the main electric strut drive module and the auxiliary electric strut drive module start working, and the step of driving the electric strut to open the tailgate includes:
[0075] The electric struts of the main electric strut drive module and the auxiliary electric strut drive module begin to work;
[0076] The electric strut in the main electric strut drive module applies an upward rotational force to the tailgate, and the current signal of the main electric strut drive module indicates that the tailgate is open; at the same time, the electric strut in the auxiliary electric strut drive module applies an upward rotational force to the tailgate, and the upward rotational force of the electric strut in the auxiliary electric strut drive module is less than the weight of the tailgate.
[0077] When the tailgate of a car encounters an obstacle during opening, the drive current signal of the main drive strut changes, transforming into a tailgate opening obstruction state. The ECU control unit determines that an obstacle has appeared by detecting the current signal through the current detection circuit. The ECU control unit controls the drive motor of the electric strut in the main electric strut drive module to reduce its speed, while the electric strut in the auxiliary electric strut drive module remains working to keep the tailgate in a suspended state.
[0078] The current detection circuit continuously monitors the drive current signal of the main electric strut drive module. Within a preset time period ST1, if the current detection circuit detects that the drive current signal of the main electric strut drive module is still in the state of obstructed tailgate opening, it is determined that the obstacle has not been removed. Then, the ECU control unit controls the drive motors of the main electric strut drive module and the auxiliary electric strut drive module to gradually stop working. If the current detection circuit detects that the drive current signal of the main electric strut drive module tends to be stable, it is determined that the obstacle has been removed. The ECU control unit controls the tailgate to continue opening, and the electric strut opening speed of the main electric strut drive module reaches V1.
[0079] The current detection circuit continuously monitors the drive current signal of the main electric strut drive module and continuously judges the status of the drive current signal of the main electric strut drive module at least 3 times. If the drive current signal of the main electric strut drive module is stable, the ECU control unit controls the electric strut opening speed of the main electric strut drive module to return to the normal speed V. If the drive current signal of the main electric strut drive module experiences a sudden change, the above steps are returned.
[0080] The car's tailgate opens to its maximum height at a normal speed V.
[0081] In the above steps, the time period ST1 is one second; the speed V1 is between one-third and one-half of the normal speed V.
[0082] The control method of the anti-pinch control system for the car tailgate provided in this embodiment further includes the following steps:
[0083] If the car's tailgate is in the open position;
[0084] The ECU control unit monitors the opening and closing status of the car's tailgate in real time. When the ECU control unit receives a tailgate closing command, it closes the tailgate. The current detection circuit continuously detects the current signal in the car's tailgate anti-pinch control system.
[0085] If the current detection circuit detects that the tailgate is blocked from closing, the ECU control unit controls the tailgate to hover, and the current detection circuit continuously detects the current signal in the vehicle tailgate anti-pinch control system.
[0086] The ECU control unit controls the tailgate to continue closing and locking until the current detection circuit detects a current signal indicating that the tailgate is closed.
[0087] Upon receiving the tailgate closing command, the ECU control unit closes the tailgate and completes the tailgate opening action according to the following steps:
[0088] The main electric strut drive module and the auxiliary electric strut drive module drive the motor in opposite directions to drive the electric strut to close the rear door.
[0089] When the tailgate of the car encounters an obstacle during the closing process, the drive current signal of the main electric strut drive module changes, transforming into a tailgate closing obstruction state. The ECU control unit determines that an obstacle has appeared, and controls the drive motor of the auxiliary electric strut drive module to increase the power, so that the tailgate of the car quickly retracts. At the same time, it controls the drive motor of the main electric strut drive module to stop working, and the tailgate of the car moves upward by a distance S1.
[0090] The ECU control unit controls the drive motor of the electric strut in the main electric strut drive module to reduce its speed, while the electric strut in the auxiliary electric strut drive module remains active to keep the tailgate in a suspended state.
[0091] The current detection circuit continuously monitors the drive current signal of the main electric strut drive module. Within a preset time period ST1, if the current detection circuit detects that the drive current signal of the main electric strut drive module is still in the state of obstructed tailgate opening, it is determined that the obstacle has not been removed. Then, the ECU control unit controls the drive motors of the main electric strut drive module and the auxiliary electric strut drive module to gradually stop working. If the current detection circuit detects that the drive current signal of the main electric strut drive module tends to be stable, it is determined that the obstacle has been removed. Then, the ECU control unit controls the electric strut closing speed of the main electric strut drive module to reach V1.
[0092] The current detection circuit continuously monitors the drive current signal of the main electric strut drive module and continuously judges the drive current signal status of the main electric strut drive module at least 3 times. If the drive current signal of the main electric strut drive module is stable, the ECU control unit controls the main electric strut drive module to turn off at a speed that returns to the normal speed V. If the drive current signal of the main electric strut drive module experiences a sudden change, the above steps are returned.
[0093] The car's tailgate closes and locks at a normal speed V.
[0094] Specifically, in this embodiment, the distance S1 is between 10 cm and 20 cm; the time period ST1 is one second; and the speed V1 is between one-third and one-half of the normal speed V.
[0095] This invention provides a car tailgate anti-pinch control system and method. By linking the drive motors of the drive struts located on the left and right sides of the tailgate with signals, and simultaneously determining the tailgate's operating status based on continuous abrupt changes in the drive motor current signal, it avoids damage to obstacles caused by a continuous increase in the current signal, as well as wear and tear on the motor itself due to stalling. Through the drive motors of the drive struts, the signal monitoring and transmission unit, and the identification and judgment mechanism, it achieves refined control over obstacles, reduces the occurrence of drive motor stalling, and ensures that the drive motor continues to run even after the obstacle has moved, guaranteeing the normal opening and closing of the tailgate. This invention simplifies the tailgate monitoring device, reduces the number of cameras, narrows the recognition range of the anti-pinch rubber strip signal, and streamlines the control steps.
[0096] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the present invention. Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.
[0097] The above provides a detailed description of the anti-pinch control system and method for the rear door of an automobile provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A car tailgate anti-pinch control system, characterized in that, The vehicle tailgate anti-pinch control system includes: The tailgate switch control module is used to control the opening and closing of the car tailgate according to the status of the car tailgate. An electric strut drive module is used to drive an electric strut to open or close the tailgate of a car. The electric strut drive module is equipped with an electric strut, which is a motor-driven structure. The tailgate switch control module controls the operation of the electric strut drive module. The vehicle tailgate anti-pinch control system includes two sets of electric strut drive modules, respectively located on the left and right sides of the tailgate. One side is a main electric strut drive module, and the other side is a secondary electric strut drive module. Both the main electric strut drive module and the secondary electric strut drive module drive the tailgate when it is opened or closed. When the tailgate is obstructed from opening or closing, the main electric strut drive module stops, and the secondary electric strut drive module operates to maintain the balance of the tailgate.
2. The anti-pinch control system for the rear door of an automobile according to claim 1, characterized in that, The tailgate opening and closing control module includes: A current detection circuit is used to monitor the current signal of the electric strut drive module; The signal monitoring and transmission unit is used to transmit the current signal of the electric strut drive module back to the ECU control unit; The ECU control unit controls the electric strut drive module to work based on the current signal detected by the current detection circuit; the ECU control unit determines the different states of the tailgate based on the continuous abrupt changes in the current signal under different states, and controls the electric strut drive module to work according to the preset calibration. The ECU control unit is divided into different modes based on the current signal of the tailgate in different states, including: tailgate closed state, tailgate open / closed state, tailgate opening / closing obstructed state, and tailgate hovering state.
3. The anti-pinch control system for the rear door of an automobile according to claim 2, characterized in that, The preset calibration of the ECU control unit includes: If the current signal indicates that the tailgate is closed, the electric strut drive module is controlled to not work; if the current signal indicates that the tailgate is open / closed, the electric strut drive module is controlled to work continuously. If the current signal indicates that the opening / closing of the tailgate is obstructed, then the power of the electric strut drive module is reduced. If the current signal indicates that the rear door is in a suspended state, then the electric strut drive module is controlled to stop working.
4. The anti-pinch control system for the rear door of an automobile according to claim 1, characterized in that, The electric strut has a hydraulic spring structure to ensure that the electric strut can be used as a hydraulic strut in a non-motor-driven state.
5. A control method for an anti-pinch control system for a car tailgate according to any one of claims 1-4, characterized in that, Includes the following steps: When the vehicle is unlocked, the tailgate switch control module enters the working mode and determines the current state of the car's tailgate. If the car's tailgate is closed; When the tailgate switch control module receives the tailgate opening command, the main electric strut drive module and the auxiliary electric strut drive module start working to drive the electric struts to open the tailgate. The tailgate switch control module continuously monitors the current status in the electric strut drive module. If the tailgate switch control module detects that the tailgate current state is in an opening obstruction state, the tailgate switch control module controls the main electric strut drive module to stop working, and the auxiliary electric strut drive module works to maintain the tailgate balance. The tailgate switch control module continuously monitors the current status in the electric strut drive module. When the tailgate switch control module detects that the tailgate current status is in the open state, the tailgate switch control module controls the tailgate to continue opening until the tailgate reaches its maximum opening height.
6. The control method of the automobile tailgate anti-pinch control system according to claim 5, characterized in that, When the tailgate switch control module receives a tailgate opening command, the main electric strut drive module and the auxiliary electric strut drive module start working, and the steps of driving the electric strut to open the tailgate include: The electric struts of the main electric strut drive module and the auxiliary electric strut drive module begin to work; The electric strut in the main electric strut drive module applies an upward rotational force to the tailgate, and the current signal of the main electric strut drive module indicates that the tailgate is open; at the same time, the electric strut in the auxiliary electric strut drive module applies an upward rotational force to the tailgate, and the upward rotational force of the electric strut in the auxiliary electric strut drive module is less than the weight of the tailgate. When the tailgate of a car encounters an obstacle during opening, the drive current signal of the main electric strut drive module changes, transforming into a tailgate opening obstruction state. The ECU control unit determines that an obstacle has appeared by detecting the current signal through the current detection circuit. The ECU control unit controls the drive motor of the electric strut in the main electric strut drive module to reduce its speed, while the electric strut in the auxiliary electric strut drive module remains working to keep the tailgate in a suspended state. The current detection circuit continuously monitors the drive current signal of the main electric strut drive module. Within a preset time period ST1, if the current detection circuit detects that the drive current signal of the main electric strut drive module is still in the state of obstructed tailgate opening, it is determined that the obstacle has not been removed. Then, the ECU control unit controls the drive motors of the main electric strut drive module and the auxiliary electric strut drive module to gradually stop working. If the current detection circuit detects that the drive current signal of the main electric strut drive module tends to be stable, it is determined that the obstacle has been removed. The ECU control unit controls the tailgate to continue opening, and the electric strut opening speed of the main electric strut drive module reaches V1. The current detection circuit continuously monitors the drive current signal of the main electric strut drive module and continuously judges the status of the drive current signal of the main electric strut drive module at least 3 times. If the drive current signal of the main electric strut drive module is stable, the ECU control unit controls the electric strut opening speed of the main electric strut drive module to return to the normal speed V. If the drive current signal of the main electric strut drive module experiences a sudden change, the above steps are returned. The car's tailgate opens to its maximum height at a normal speed V.
7. The control method of the automobile tailgate anti-pinch control system according to claim 6, characterized in that, The time period ST1 is one second; the speed V1 is between one-third and one-half of the normal speed V.
8. The control method of the automobile tailgate anti-pinch control system according to claim 5, characterized in that, The control method for the anti-pinch control system of a car's rear tailgate also includes the following steps: If the car's tailgate is in the open position; The ECU control unit monitors the opening and closing status of the car's tailgate in real time. When the ECU control unit receives a tailgate closing command, it closes the tailgate. The current detection circuit continuously detects the current signal in the car's tailgate anti-pinch control system. If the current detection circuit detects that the tailgate is blocked from closing, the ECU control unit controls the tailgate to hover, and the current detection circuit continuously detects the current signal in the vehicle tailgate anti-pinch control system. The ECU control unit controls the tailgate to continue closing and locking until the current detection circuit detects a current signal indicating that the tailgate is closed.
9. The control method of the automobile tailgate anti-pinch control system according to claim 8, characterized in that, After receiving the tailgate closing command, the ECU control unit closes the tailgate by performing the following steps to complete the tailgate opening action: The main electric strut drive module and the auxiliary electric strut drive module drive the motor in opposite directions to drive the electric strut to close the rear door. When the tailgate of the car encounters an obstacle during the closing process, the drive current signal of the main electric strut drive module changes, transforming into a tailgate closing obstruction state. The ECU control unit determines that an obstacle has appeared, and controls the drive motor of the auxiliary electric strut drive module to increase the power, so that the tailgate of the car quickly retracts. At the same time, it controls the drive motor of the main electric strut drive module to stop working, and the tailgate of the car moves upward by a distance S1. The ECU control unit controls the drive motor of the electric strut in the main electric strut drive module to reduce its speed, while the electric strut in the auxiliary electric strut drive module remains active to keep the tailgate in a suspended state. The current detection circuit continuously monitors the drive current signal of the main electric strut drive module. Within a preset time period ST1, if the current detection circuit detects that the drive current signal of the main electric strut drive module is still in the state of obstructed tailgate opening, it is determined that the obstacle has not been removed. Then, the ECU control unit controls the drive motors of the main electric strut drive module and the auxiliary electric strut drive module to gradually stop working. If the current detection circuit detects that the drive current signal of the main electric strut drive module tends to be stable, it is determined that the obstacle has been removed. Then, the ECU control unit controls the electric strut closing speed of the main electric strut drive module to reach V1. The current detection circuit continuously monitors the drive current signal of the main electric strut drive module and continuously judges the drive current signal status of the main electric strut drive module at least 3 times. If the drive current signal of the main electric strut drive module is stable, the ECU control unit controls the main electric strut drive module to turn off at a speed that returns to the normal speed V. If the drive current signal of the main electric strut drive module experiences a sudden change, the above steps are returned. The car's tailgate closes and locks at a normal speed V.
10. The control method of the automobile tailgate anti-pinch control system according to claim 9, characterized in that, The distance S1 is between 10 cm and 20 cm; the time period ST1 is one second; the speed V1 is between one-third and one-half of the normal speed V.
Citation Information
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