Kicking automobile tail door opening device based on double-antenna structural design

Abstract

The invention provides a kicking automobile tail door opening device based on a double-antenna structural design, the device comprises a central processing unit and a double-antenna structure, the double-antenna structure is realized by integrating two antennas on a circuit board, and the central processing unit controls the double-antenna structure to emit electromagnetic wave signals. An electromagnetic wave signal reflected by the detection target is received by using a receiving antenna; the data processing module is configured to analyze the received echo signal so as to obtain the speed, angle and distance information of the detection target; calculating and judging the information through a preset algorithm to determine whether the information is a human body approaching signal and / or a foot kicking action; and when the judgment result is yes, the device sends a tail door opening signal to open the tail door of the automobile trunk. According to the invention, the millimeter wave radar is used as a sensing element, a foot kicking signal and a human body approaching signal can be accurately detected through a double-antenna structural design, and a high-precision, high-resolution and high-range detection function is realized.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle-mounted millimeter-wave radar antennas, and in particular to a foot-kick vehicle tailgate opening device based on a dual-antenna structure design. Background Art

[0002] With the continuous development of automobile technology and the increasing demand of consumers for automobile convenience, the contactless trunk opening function has gradually become one of the standard features of modern cars. The traditional way of opening the trunk, such as operating through the door switch or the switch near the trunk, is simple and reliable, but it is particularly inconvenient when the user carries heavy objects with both hands. In order to solve this problem, the automatic sensing device for the tailgate of the car came into being, among which the kick-to-open function is widely welcomed because of its convenient and comfortable operation.

[0003] However, most of the car tailgate kick sensing systems on the market currently use capacitive sensing devices. This device determines whether there is a kicking action by sensing the change in the capacitance value of two capacitor bars at the rear of the car, thereby realizing the automatic opening of the trunk. Although the capacitive sensing device has achieved the function of non-contact opening to a certain extent, it has obvious shortcomings in practical applications.

[0004] The main problems with capacitive sensing devices are false triggering and poor sensitivity. Due to the characteristics of capacitive sensors, it is difficult to accurately distinguish between effective kicking and ineffective kicking. Environmental factors such as pedestrians walking by and wind blowing may cause false triggering. At the same time, the sensitivity of capacitive sensing devices is also limited, and the trunk often fails to open after the user kicks, which seriously affects the user experience.

[0005] In order to overcome the above-mentioned defects of capacitive sensing devices, the industry has begun to explore the use of new sensing technologies. As an advanced sensing technology, millimeter wave radar has gradually attracted attention due to its advantages such as accurate distance measurement, rich information, and strong anti-interference ability. Millimeter wave radar operates in the millimeter wave frequency band. It can use the antenna to transmit radio waves and receive echoes, and measure the target's position data based on the time difference between transmission and reception. At the same time, millimeter wave radar can also obtain information such as the target's speed, distance, angle and amplitude, and can more accurately reflect the target's motion characteristics.

[0006] Therefore, applying millimeter wave radar to the car tailgate kick-opening system can significantly improve the detection success rate and accuracy of the system and reduce the probability of false triggering. Millimeter wave radar can more accurately identify effective kicking actions, thereby providing users with a more convenient and comfortable trunk opening experience. The present invention is proposed based on this background technology and aims to provide a car tailgate opening system based on a dual antenna structure design to solve the shortcomings of existing capacitive sensing devices and improve the convenience and accuracy of car tailgate opening. Summary of the invention

[0007] In order to solve the problems of poor sensitivity and low judgment accuracy of traditional tailgate opening radar, the present invention provides a car tailgate opening device based on a dual-antenna structure design. The device adopts millimeter-wave radar as a sensing element. Through the dual-antenna structure design, it can accurately detect kicking signals and human body approaching signals, and realize high-precision, high-resolution and high-range detection functions.

[0008] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0009] A foot-kick car tailgate opening device based on a dual-antenna structure design comprises:

[0010] A central processing unit, which has a built-in radio frequency transmission module, a data processing module and a message transceiver module. The central processing unit uses a millimeter wave radar dedicated chip and has a 77GHz / 79GHz radio frequency transmission capability;

[0011] A dual antenna structure, connected to the central processor, for simultaneously detecting a signal of a human body approaching and a signal of a kicking action, wherein the dual antenna structure is implemented by integrating two antennas on a circuit board, wherein the transceiver direction of the first antenna is set to face directly downward to detect a kicking action, and the transceiver direction of the second antenna is set to face a direction orthogonal to the first antenna to detect a signal of a human body approaching;

[0012] LIN bus transceiver controller, used to communicate with the vehicle body and send and receive LIN signals;

[0013] CAN bus transceiver controller, used to communicate with the vehicle body and send and receive CAN signals;

[0014] The device is configured to be installed under the bumper of the trunk of a car, and the central processor controls the dual antenna structure to emit electromagnetic wave signals, and uses the receiving antenna to receive the electromagnetic wave signals reflected by the detection target; the data processing module is configured to parse the received echo signal to obtain the speed, angle and distance information of the detection target; the information is calculated and judged by a preset algorithm to determine whether it is a human body approaching signal and / or a kicking action; when the judgment result is yes, the device sends a tailgate opening signal to open the tailgate of the trunk of the car.

[0015] According to the present invention, a car tailgate opening device based on a dual-antenna structure design is provided, wherein the first antenna is a microstrip patch antenna, adopts a 1T2R mode, that is, one transmitting unit and two receiving units, for detecting a kicking action; the second antenna is a tapered slot antenna, including a front-coupled microstrip line feeding balun structure and a back-coplanar tapered slot structure, for improving the reception and transmission efficiency of radar signals.

[0016] According to the present invention, a foot-kick car tailgate opening device based on a dual-antenna structure design is provided. The dual-antenna structure also includes a first antenna metal layer, an antenna dielectric substrate, and a second antenna metal layer. The antenna dielectric substrate is placed horizontally, and the first edge of the antenna dielectric substrate is in contact with the first antenna metal layer, and the second edge of the antenna dielectric substrate is in contact with the second antenna metal layer. The first antenna metal layers are electrically connected to each other through at least one via passing through the antenna dielectric substrate.

[0017] According to a foot-kick car tailgate opening device based on a dual-antenna structure design provided by the present invention, the front-coupled microstrip line feeding balun structure includes: a microstrip line as an initial feeding part, one end of the microstrip line is used to connect a signal source, and the other end is converted into a parallel double-line structure; the parallel double-line structure is further transitioned to a gradient slot line structure to form a feeding balun; the feeding balun is arranged on one side of the antenna dielectric substrate.

[0018] According to the present invention, a foot-kick automobile tailgate opening device based on a dual-antenna structure design also includes:

[0019] a connector configured to plug an external wiring harness into the device to provide power to the radar device and a communication connection with a vehicle body control system;

[0020] A fixing hole is provided on the housing of the device and is used to cooperate with a fixing component on the vehicle body and firmly fix the radar device to the vehicle body through a fastener;

[0021] The radome covers the outside of the antenna part. The radome is made of a material that can transmit electromagnetic waves and also has a waterproof function.

[0022] According to a foot-kick automobile tailgate opening device based on a dual-antenna structure design provided by the present invention, the data processing process of the data processing module includes:

[0023] After the system is powered on, the radar antenna transmission parameters are initialized, including at least the transmission frequency, transmission power and beam width, and the algorithm threshold parameters are set, including at least the distance threshold, speed threshold and angle threshold, to ensure that the system is in the preset working state;

[0024] Acquire a vehicle state signal through a vehicle signal interface, wherein the vehicle state signal at least includes a vehicle speed signal and a key signal, wherein the vehicle speed signal is used to determine whether the vehicle is in a stationary state, and the key signal is used to confirm whether the vehicle is authorized to be opened;

[0025] According to the acquired vehicle speed signal, it is judged whether the vehicle is stationary, that is, whether the vehicle speed is equal to zero. If the vehicle speed is zero, it enters the target detection mode, starts to transmit electromagnetic wave signals and receives the reflected signals; if the vehicle speed is not zero, it remains in the standby state and does not perform target detection;

[0026] In the target detection mode, based on the data detected by the receiving antenna, the received data is analyzed and processed using a preset algorithm to determine whether there is a signal of a human body approaching;

[0027] Also in the target detection mode, the data processing module continues to process the received echo data, identifies the characteristics of the kicking action, and determines whether there is a kicking action;

[0028] If the data processing module detects the signal of a human body approaching and the kicking action at the same time, and confirms the existence of the key signal, that is, the vehicle is authorized to open, then a tailgate opening signal is sent to the vehicle control system to trigger the automatic opening of the tailgate; if any of the above conditions is not met, no tailgate opening signal is sent and the tailgate remains closed.

[0029] According to a foot-kick car tailgate opening device based on a dual-antenna structure design provided by the present invention, when the data processing module uses a preset algorithm to analyze and process the received echo data to determine whether it is a signal of a human body approaching, the following steps are specifically included:

[0030] The receiving radar antenna continuously transmits and receives the reflected electromagnetic wave signal, and converts the reflected signal into corresponding distance data, which represents the distance between the dual antenna structure and the target object;

[0031] Perform time series analysis on the acquired distance data, calculate the change rate or amount of the distance data over time, and form a distance change curve or distance change feature;

[0032] A characteristic criterion of the distance change of a human body approaching is preset, and the criterion includes a trend of the distance changing from large to small, and a possible change rate range or a change amount threshold. These characteristics are consistent with the typical movement pattern of a human body moving from far away to gradually approaching the radar antenna;

[0033] Compare the calculated distance change characteristics with the preset human body approach distance change characteristic criterion to determine whether the distance data shows a trend of changing from large to small, and whether the change rate or change amount is within a preset range;

[0034] If the distance data meets the preset human body approach distance change characteristic criterion, it is determined that a human body approaching signal is detected; if not, it is determined that no human body approaching signal is detected, or other non-human body approaching objects or interference signals may be detected.

[0035] According to a foot-kicking automobile tailgate opening device based on a dual-antenna structure design provided by the present invention, when identifying the characteristics of the kicking action, it is determined whether the distance characteristic of the echo data decreases first and then increases, and whether the speed characteristic appears to be positive first and then becomes negative, and this is used as the characteristic for identifying the kicking action, thereby determining whether there is a kicking action; wherein, the distance characteristic decreases first and then increases, indicating that the detection target moves away after approaching the detector, which is consistent with the process of the leg being lifted up and then falling down in the kicking action; the speed characteristic is positive first and then becomes negative, indicating that the detection target has a positive speed when approaching the detector and a negative speed when moving away from the detector, corresponding to the process of the leg accelerating to be lifted up and decelerating to fall down in the kicking action.

[0036] According to a foot-kick car tailgate opening device based on a dual-antenna structure design provided by the present invention, the message transceiver module is configured as follows:

[0037] Receiving detection results from the data processing module, the detection results are obtained by the data processing module receiving and processing echo data generated by the detection signal sent by the radio frequency transmission module, and are used to determine whether there are obstacles around the vehicle and other features;

[0038] Encapsulating the detection result into a message format that complies with a predetermined communication protocol;

[0039] The encapsulated message is sent to the vehicle control system or other related equipment through the wireless communication network, so that the vehicle control system or other related equipment can perform corresponding operations or decisions according to the detection results.

[0040] According to a foot-kick automobile tailgate opening device based on a dual-antenna structure design provided by the present invention, the LIN bus transceiver controller and the CAN bus transceiver controller are further configured as follows:

[0041] Integrated into a single integrated circuit chip to form a composite bus transceiver control module, which has the ability to process LIN signals and CAN signals at the same time;

[0042] The composite bus transceiver control module is provided with a signal conversion unit for performing format conversion and protocol adaptation between LIN signals and CAN signals, so that data received through the LIN bus can be converted into data in the CAN bus format for transmission, and vice versa, thereby achieving seamless communication between the LIN bus and the CAN bus;

[0043] The composite bus transceiver control module is also provided with an intelligent routing function, which automatically selects the most suitable bus for data transmission according to the received signal type and target address, optimizes the communication path, and improves the communication efficiency;

[0044] The LIN bus transceiver controller and the CAN bus transceiver controller both support configurable baud rate and data bit settings to meet the communication requirements of different automobile body systems and enhance the compatibility and flexibility of the system;

[0045] The composite bus transceiver control module has a built-in fault diagnosis function, which can monitor the communication status of the LIN bus and the CAN bus in real time, automatically detect and report communication faults, and facilitate rapid positioning and resolution of communication problems.

[0046] It can be seen that compared with the prior art, the present invention has the following beneficial effects:

[0047] 1. The present invention can obtain multi-dimensional information such as the speed, distance, angle and amplitude of the target through the millimeter wave radar, which is richer and more accurate than the information obtained by the capacitive sensor. Therefore, the millimeter wave radar is easier to identify the kicking action, has a higher detection success rate and accuracy, greatly reduces the probability of false triggering, and improves the overall performance and user experience of the kick tailgate system.

[0048] 2. When traditional capacitive sensing devices detect human body approach signals, there may be safety hazards if the user is too close to the car door. The high precision and high resolution characteristics of millimeter wave radar enable it to more accurately judge the distance between the human body and the car door, thereby effectively avoiding safety problems that may be caused by users being too close to the car door.

[0049] 3. The device of the present invention can not only realize the proximity detection function of ordinary proximity capacitive sensors, but also analyze the detailed data such as the amplitude, angle, speed, distance, etc. of the approach and distance of the kick, and can distinguish effective actions (a kick) and ineffective actions to the greatest extent, effectively preventing the occurrence of missed reports and false reports. When using it, the user does not need to worry about not being able to open the tailgate due to misoperation, nor does he need to worry about accidentally triggering the opening function due to non-kicking actions, which greatly improves the convenience and comfort of use.

[0050] 4. The device of the present invention adopts advanced millimeter-wave radar technology and integrates multiple communication methods such as CAN communication, LIN communication, and serial communication, which is convenient for connection and communication with the automobile body system. This not only improves the technical advancement of the system, but also provides convenience for subsequent functional expansion and upgrading.

[0051] 5. The device of the present invention is reasonably designed and easy to install, without the need for complex modification or adjustment of the car. At the same time, as millimeter wave radar technology continues to mature and become more popular, its cost is also gradually decreasing, which makes the device of the present invention have obvious advantages in terms of cost-effectiveness.

[0052] To sum up, the foot-kick car tailgate opening device based on the dual-antenna structure design of the present invention shows significant beneficial effects in improving detection accuracy and success rate, enhancing system safety, optimizing user experience, technological advancement and scalability, and easy installation and cost-effectiveness. It not only improves the overall performance of the car tailgate opening system, but also brings users a more convenient, comfortable and safe use experience.

[0053] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a schematic diagram of the direction of dual antenna detection in an embodiment of a foot-kick automobile tailgate opening device based on a dual antenna structure design of the present invention.

[0055] Figure 2 The present invention is a schematic structural diagram of a dual-antenna structure in an embodiment of a foot-kick automobile tailgate opening device based on a dual-antenna structure design.

[0056] Figure 3 The present invention is a schematic structural diagram of an antenna metal layer and an antenna dielectric substrate in an embodiment of a foot-kick automobile tailgate opening device based on a dual-antenna structure design.

[0057] Figure 4 It is a three-dimensional exploded view of a dual-antenna structure in an embodiment of a foot-kick automobile tailgate opening device based on a dual-antenna structure design of the present invention.

[0058] Figure 5 The present invention is a schematic diagram of the appearance structure of an embodiment of a foot-kick automobile tailgate opening device based on a dual-antenna structure design.

[0059] Figure 6 The present invention is a three-dimensional exploded view of an embodiment of a foot-kick automobile tailgate opening device based on a dual-antenna structure design.

[0060] Figure 7 The invention discloses a circuit schematic diagram of a central processing unit in an embodiment of a device for opening a car tailgate by kicking the car tailgate based on a dual-antenna structure design.

[0061] Figure 8 The present invention is a flow diagram of data processing in an embodiment of a foot-kick automobile tailgate opening device based on a dual-antenna structure design. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0063] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0064] See also Figures 1 to 8 This embodiment provides a foot-kick car tailgate opening device based on a dual-antenna structure design, comprising:

[0065] The central processing unit has a built-in RF transmission module, data processing module and message transceiver module. The central processing unit uses a dedicated millimeter-wave radar chip and has 77GHz / 79GHz RF transmission capability. It integrates CAN communication, serial port communication, etc. and is an automotive-grade chip.

[0066] The dual antenna structure is connected to the central processing unit and is used to simultaneously detect the signal of a human body approaching and the signal of a kicking action. The dual antenna structure is realized by integrating two antennas on a circuit board, wherein the transmitting and receiving direction of the first antenna 1 is set to face directly downward to detect the kicking action, and the transmitting and receiving direction of the second antenna 2 is set to a direction orthogonal to the first antenna 1 to detect the signal of a human body approaching.

[0067] LIN bus transceiver controller, used to communicate with the car body and send and receive LIN signals.

[0068] CAN bus transceiver controller is used to communicate with the car body and send and receive CAN signals.

[0069] The device is configured to be installed under the bumper of the car trunk, and can be installed outside the bumper or inside the bumper. The central processor controls the dual antenna structure to send electromagnetic wave signals, and uses the receiving antenna to receive the electromagnetic wave signals reflected by the detection target; the data processing module is configured to analyze the received echo signal to obtain the speed, angle and distance information of the detection target; the information is calculated and judged by a preset algorithm to determine whether it is a human body approaching signal and / or a kicking action; when the judgment result is yes, the device sends a tailgate opening signal to open the car trunk tailgate.

[0070] In this embodiment, if Figure 2 As shown, the first antenna 1 is a microstrip patch antenna, which adopts the 1T2R mode, that is, one transmitting unit and two receiving units, which is used to detect kicking actions; the second antenna 2 is a gradient slot line antenna, including a front-coupled microstrip line feeding balun structure and a back-coplanar gradient slot line structure, and the back of the unit is a connected metal layer, which is used to improve the reception and transmission efficiency of radar signals.

[0071] like Figure 3 and 4 As shown, the dual antenna structure also includes a first antenna metal layer 5, an antenna dielectric substrate 6, and a second antenna metal layer 7. The antenna dielectric substrate 6 is placed horizontally, a first edge of the antenna dielectric substrate 6 is in contact with the first antenna metal layer 5, and a second edge of the antenna dielectric substrate 6 is in contact with the second antenna metal layer 7. The first antenna metal layers 5 are electrically connected to each other through at least one via 4 that passes through the antenna dielectric substrate 6.

[0072] Specifically, the front-coupled microstrip line feeding balun structure includes: a microstrip line 3 as an initial feeding part, one end of the microstrip line 3 is used to connect the signal source, and the other end is converted into a parallel double-line structure; the parallel double-line structure is further transitioned to a gradient slot line structure to form a feeding balun; the feeding balun is arranged on one side of the antenna dielectric substrate 6. The material 6 of the antenna dielectric substrate is Rogers 3003 (G2), the thickness is 0.127 mm, and the relative dielectric constant is 0.0011.

[0073] In this embodiment, if Figure 5 As shown, the device also includes:

[0074] A socket 101 configured to insert an external wiring harness into the device to achieve power supply of the radar device and communication connection with the vehicle body control system;

[0075] The fixing holes 102, 103, and 104 are provided on the housing of the device and are used to cooperate with the fixing components on the vehicle body and firmly fix the radar device to the vehicle body through fasteners;

[0076] The radome 105 covers the outside of the antenna part. The radome is made of a material that can transmit electromagnetic waves and has a waterproof function. After being connected to the bottom plate 11, it can drain water.

[0077] Circuit printed board 15, waterproof breathable membrane 12, radar bottom plate 11.

[0078] like Figure 6 As shown, the antenna cover 105 includes an antenna cover 18, shielding covers 13, 14, 16, 17

[0079] like Figure 7 and 8 As shown, the data processing process of the data processing module includes:

[0080] After the system is powered on, the radar antenna transmission parameters are initialized, including at least the transmission frequency, transmission power and beam width, and the algorithm threshold parameters are set, including at least the distance threshold, speed threshold and angle threshold, to ensure that the system is in the preset working state;

[0081] Obtaining a vehicle state signal through a vehicle signal interface, the vehicle state signal at least including a vehicle speed signal and a key signal, wherein the vehicle speed signal is used to determine whether the vehicle is in a stationary state, and the key signal is used to confirm whether the vehicle is authorized to be opened;

[0082] According to the acquired vehicle speed signal, it is judged whether the vehicle is stationary, that is, whether the vehicle speed is equal to zero. If the vehicle speed is zero, it enters the target detection mode, starts to transmit electromagnetic wave signals and receives the reflected signals; if the vehicle speed is not zero, it remains in the standby state and does not perform target detection;

[0083] In the target detection mode, based on the data detected by the receiving antenna, the received data is analyzed and processed using a preset algorithm to determine whether there is a signal of a human body approaching;

[0084] Also in the target detection mode, the data processing module continues to process the received echo data, identifies the characteristics of the kicking action, and determines whether there is a kicking action;

[0085] If the data processing module detects the signal of a human body approaching and the kicking action at the same time, and confirms the existence of the key signal, that is, the vehicle is authorized to open, then a tailgate opening signal is sent to the vehicle control system to trigger the automatic opening of the tailgate; if any of the above conditions is not met, no tailgate opening signal is sent and the tailgate remains closed.

[0086] According to a foot-kick car tailgate opening device based on a dual-antenna structure design provided by the present invention, when a data processing module uses a preset algorithm to analyze and process the received echo data to determine whether it is a signal of a human body approaching, the following steps are specifically included:

[0087] The receiving radar antenna continuously transmits and receives the reflected electromagnetic wave signal, and converts the reflected signal into corresponding distance data, which represents the distance between the dual antenna structure and the target object;

[0088] Perform time series analysis on the acquired distance data, calculate the change rate or amount of the distance data over time, and form a distance change curve or distance change feature;

[0089] A characteristic criterion of the distance change of a human body approaching is preset, and the criterion includes a trend of the distance changing from large to small, and a possible change rate range or a change amount threshold. These characteristics are consistent with the typical movement pattern of a human body moving from far away to gradually approaching the radar antenna;

[0090] Compare the calculated distance change characteristics with the preset human body approach distance change characteristic criterion to determine whether the distance data shows a trend of changing from large to small, and whether the change rate or change amount is within a preset range;

[0091] If the distance data meets the preset human body approach distance change characteristic criterion, it is determined that a human body approaching signal is detected; if not, it is determined that no human body approaching signal is detected, or other non-human body approaching objects or interference signals may be detected.

[0092] According to the present invention, a car tailgate opening device based on a dual-antenna structure design provides a kicking device. When identifying the characteristics of the kicking action, it is determined whether the distance characteristic of the echo data decreases first and then increases, and whether the speed characteristic appears to be positive first and then becomes negative, so as to use this as the characteristics of identifying the kicking action, and then determine whether there is a kicking action; wherein, the distance characteristic decreases first and then increases, indicating that the detection target moves away after approaching the detector, which is consistent with the process of the leg being lifted up and then falling down in the kicking action; the speed characteristic is positive first and then becomes negative, indicating that the detection target has a positive speed when approaching the detector and a negative speed when moving away from the detector, corresponding to the process of the leg accelerating to be lifted up and decelerating to fall down in the kicking action.

[0093] According to a foot-kick car tailgate opening device based on a dual-antenna structure design provided by the present invention, the message transceiver module is configured as follows:

[0094] Receive the detection result from the data processing module. The detection result is obtained by the data processing module after receiving and processing the echo data generated by the detection signal sent by the radio frequency transmission module, and is used to determine whether there are obstacles around the vehicle and other features;

[0095] Encapsulate the detection results into a message format that complies with a predetermined communication protocol;

[0096] The encapsulated message is sent to the vehicle control system or other related equipment through the wireless communication network, so that the vehicle control system or other related equipment can perform corresponding operations or decisions according to the detection results.

[0097] According to a foot-kick automobile tailgate opening device based on a dual-antenna structure design provided by the present invention, the LIN bus transceiver controller and the CAN bus transceiver controller are further configured as follows:

[0098] Integrated into a single integrated circuit chip to form a composite bus transceiver control module, which has the ability to process LIN signals and CAN signals at the same time;

[0099] A signal conversion unit is provided in the composite bus transceiver control module, which is used to perform format conversion and protocol adaptation between LIN signals and CAN signals, so that the data received through the LIN bus can be converted into data in the CAN bus format for transmission, and vice versa, thereby realizing seamless communication between the LIN bus and the CAN bus;

[0100] The composite bus transceiver control module also has an intelligent routing function, which automatically selects the most suitable bus for data transmission according to the received signal type and target address, optimizes the communication path, and improves communication efficiency;

[0101] Both the LIN bus transceiver controller and the CAN bus transceiver controller support configurable baud rate and data bit settings to meet the communication requirements of different automotive body systems and enhance the compatibility and flexibility of the system;

[0102] The composite bus transceiver control module has a built-in fault diagnosis function, which can monitor the communication status of the LIN bus and CAN bus in real time, automatically detect and report communication faults, and facilitate rapid location and resolution of communication problems.

[0103] In summary, the foot-kick car tailgate opening device based on the dual-antenna structure design of the present invention shows significant beneficial effects in improving detection accuracy and success rate, enhancing system safety, optimizing user experience, technological advancement and scalability, and easy installation and cost-effectiveness. It not only improves the overall performance of the car tailgate opening system, but also brings users a more convenient, comfortable and safe use experience.

[0104] Furthermore, the present invention can obtain multi-dimensional information such as the speed, distance, angle and amplitude of the target through the millimeter wave radar, which is richer and more accurate than the information obtained by the capacitive sensor. Therefore, the millimeter wave radar is easier to identify the kicking action, has a higher detection success rate and accuracy, greatly reduces the probability of false triggering, and improves the overall performance and user experience of the kick tailgate system.

[0105] Furthermore, when detecting human body approach signals, traditional capacitive sensing devices may pose a safety hazard if the user is too close to the car door. The high precision and high resolution characteristics of millimeter wave radar enable it to more accurately judge the distance between the human body and the car door, thereby effectively avoiding safety issues that may be caused by users being too close to the car door.

[0106] Furthermore, the device of the present invention can not only realize the proximity detection function of ordinary proximity capacitive sensors, but also analyze the detailed data such as the amplitude, angle, speed, distance, etc. of the approach and distance of the kick, and can distinguish between effective actions (a kick) and ineffective actions to the greatest extent, effectively preventing the occurrence of missed reports and false reports. When using it, the user does not need to worry about not being able to open the tailgate due to misoperation, nor does he need to worry about accidentally triggering the opening function due to non-kicking actions, thereby greatly improving the convenience and comfort of use.

[0107] Furthermore, the device of the present invention adopts advanced millimeter-wave radar technology and integrates multiple communication methods such as CAN communication, LIN communication, and serial communication, which is convenient for connection and communication with the automobile body system. This not only improves the technical advancement of the system, but also provides convenience for subsequent functional expansion and upgrading.

[0108] Furthermore, the device of the present invention is reasonably designed and easy to install, and does not require complicated modification or adjustment of the car. At the same time, as millimeter wave radar technology continues to mature and become more popular, its cost is gradually decreasing, which makes the device of the present invention have obvious advantages in terms of cost-effectiveness.

[0109] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0110] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A foot-kick car tailgate opening device based on a dual-antenna structure design, characterized in that: include: A central processing unit, which has a built-in radio frequency transmission module, a data processing module and a message transceiver module. The central processing unit uses a millimeter wave radar dedicated chip and has a 77GHz / 79GHz radio frequency transmission capability; A dual antenna structure, connected to the central processor, for simultaneously detecting a signal of a human body approaching and a signal of a kicking action, wherein the dual antenna structure is implemented by integrating two antennas on a circuit board, wherein the transceiver direction of the first antenna is set to face directly downward to detect a kicking action, and the transceiver direction of the second antenna is set to face a direction orthogonal to the first antenna to detect a signal of a human body approaching; LIN bus transceiver controller, used to communicate with the vehicle body and send and receive LIN signals; CAN bus transceiver controller, used to communicate with the vehicle body and send and receive CAN signals; The device is configured to be installed under the bumper of the trunk of a car, and the central processor controls the dual antenna structure to emit electromagnetic wave signals, and uses the receiving antenna to receive the electromagnetic wave signals reflected by the detection target; the data processing module is configured to parse the received echo signal to obtain the speed, angle and distance information of the detection target; the information is calculated and judged by a preset algorithm to determine whether it is a human body approaching signal and / or a kicking action; when the judgment result is yes, the device sends a tailgate opening signal to open the tailgate of the trunk of the car.

2. The device according to claim 1, characterized in that: The first antenna is a microstrip patch antenna, which adopts the 1T2R mode, i.e. one transmitting unit and two receiving units, and is used to detect kicking actions; the second antenna is a gradient slot line antenna, which includes a front-coupled microstrip line feeding balun structure and a back-coplanar gradient slot line structure, and is used to improve the reception and transmission efficiency of radar signals.

3. The device according to claim 2, characterized in that: The dual antenna structure also includes a first antenna metal layer, an antenna dielectric substrate, and a second antenna metal layer. The antenna dielectric substrate is placed horizontally, a first edge of the antenna dielectric substrate contacts the first antenna metal layer, and a second edge of the antenna dielectric substrate contacts the second antenna metal layer. The first antenna metal layers are electrically connected to each other through at least one via that passes through the antenna dielectric substrate.

4. The device according to claim 3, characterized in that: The front-coupled microstrip line feeding balun structure includes: a microstrip line as an initial feeding part, one end of the microstrip line is used to connect a signal source, and the other end is converted into a parallel double-line structure; the parallel double-line structure is further transitioned to a gradient slot line structure to form a feeding balun; the feeding balun is arranged on one side of the antenna dielectric substrate.

5. The device according to claim 1, characterized in that Also includes: a connector configured to plug an external wiring harness into the device to provide power to the radar device and a communication connection with a vehicle body control system; A fixing hole is provided on the housing of the device and is used to cooperate with a fixing component on the vehicle body and firmly fix the radar device to the vehicle body through a fastener; The radome covers the outside of the antenna part. The radome is made of a material that can transmit electromagnetic waves and also has a waterproof function.

6. The device according to claim 1, characterized in that: The data processing process of the data processing module includes: After the system is powered on, the radar antenna transmission parameters are initialized, including at least the transmission frequency, transmission power and beam width, and the algorithm threshold parameters are set, including at least the distance threshold, speed threshold and angle threshold, to ensure that the system is in the preset working state; Acquire a vehicle state signal through a vehicle signal interface, wherein the vehicle state signal at least includes a vehicle speed signal and a key signal, wherein the vehicle speed signal is used to determine whether the vehicle is in a stationary state, and the key signal is used to confirm whether the vehicle is authorized to be opened; According to the acquired vehicle speed signal, it is judged whether the vehicle is stationary, that is, whether the vehicle speed is equal to zero. If the vehicle speed is zero, it enters the target detection mode, starts to transmit electromagnetic wave signals and receives the reflected signals; if the vehicle speed is not zero, it remains in the standby state and does not perform target detection; In the target detection mode, based on the data detected by the receiving antenna, the received data is analyzed and processed using a preset algorithm to determine whether there is a signal of a human body approaching; Also in the target detection mode, the data processing module continues to process the received echo data, identifies the characteristics of the kicking action, and determines whether there is a kicking action; If the data processing module detects the signal of a human body approaching and the kicking action at the same time, and confirms the existence of the key signal, that is, the vehicle is authorized to open, then a tailgate opening signal is sent to the vehicle control system to trigger the automatic opening of the tailgate; if any of the above conditions is not met, no tailgate opening signal is sent and the tailgate remains closed.

7. The device according to claim 6, characterized in that When the data processing module uses a preset algorithm to analyze and process the received echo data to determine whether it is a signal of a human body approaching, the following steps are specifically included: The receiving radar antenna continuously transmits and receives the reflected electromagnetic wave signal, and converts the reflected signal into corresponding distance data, which represents the distance between the dual antenna structure and the target object; Perform time series analysis on the acquired distance data, calculate the change rate or amount of the distance data over time, and form a distance change curve or distance change feature; A characteristic criterion of the distance change of a human body approaching is preset, and the criterion includes a trend of the distance changing from large to small, and a possible change rate range or a change amount threshold. These characteristics are consistent with the typical movement pattern of a human body moving from far away to gradually approaching the radar antenna; Compare the calculated distance change characteristics with the preset human body approach distance change characteristic criterion to determine whether the distance data shows a trend of changing from large to small, and whether the change rate or change amount is within a preset range; If the distance data meets the preset human body approach distance change characteristic criterion, it is determined that a human body approaching signal is detected; if not, it is determined that no human body approaching signal is detected, or other non-human body approaching objects or interference signals may be detected.

8. The device according to claim 6, characterized in that: When identifying the characteristics of the kicking action, it is determined whether the distance characteristic of the echo data decreases first and then increases, and whether the speed characteristic becomes positive first and then becomes negative, and this is used as the characteristic for identifying the kicking action to further determine whether there is a kicking action; wherein, the distance characteristic decreases first and then increases, indicating that the detection target moves away after approaching the detector, which is consistent with the process of the leg being lifted up and then falling down in the kicking action; the speed characteristic becomes positive first and then becomes negative, indicating that the detection target has a positive speed when approaching the detector and a negative speed when moving away from the detector, corresponding to the process of the leg accelerating to be lifted up and decelerating to fall down in the kicking action.

9. The device according to any one of claims 1 to 8, characterized in that: The message transceiver module is configured as follows: Receiving detection results from the data processing module, the detection results are obtained by the data processing module receiving and processing echo data generated by the detection signal sent by the radio frequency transmission module, and are used to determine whether there are obstacles around the vehicle and other features; Encapsulating the detection result into a message format that complies with a predetermined communication protocol; The encapsulated message is sent to the vehicle control system or other related equipment through the wireless communication network, so that the vehicle control system or other related equipment can perform corresponding operations or decisions according to the detection results.

10. The device according to any one of claims 1 to 8, characterized in that: The LIN bus transceiver controller and the CAN bus transceiver controller are further configured as follows: Integrated into a single integrated circuit chip to form a composite bus transceiver control module, which has the ability to process LIN signals and CAN signals at the same time; The composite bus transceiver control module is provided with a signal conversion unit for performing format conversion and protocol adaptation between LIN signals and CAN signals, so that data received through the LIN bus can be converted into data in the CAN bus format for transmission, and vice versa, thereby achieving seamless communication between the LIN bus and the CAN bus; The composite bus transceiver control module is also provided with an intelligent routing function, which automatically selects the most suitable bus for data transmission according to the received signal type and target address, optimizes the communication path, and improves the communication efficiency; The LIN bus transceiver controller and the CAN bus transceiver controller both support configurable baud rate and data bit settings to meet the communication requirements of different automobile body systems and enhance the compatibility and flexibility of the system; The composite bus transceiver control module has a built-in fault diagnosis function, which can monitor the communication status of the LIN bus and the CAN bus in real time, automatically detect and report communication faults, and facilitate rapid positioning and resolution of communication problems.

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