Vehicle and method of controlling the same

Abstract

A vehicle includes a first antenna module located inside the vehicle, including a communication antenna and a communication module; a second antenna module located outside the vehicle, including a communication antenna and a communication module; and a controller configured to control the first antenna module and the second antenna module to communicate with each other wirelessly, to identify a distance from the vehicle to a digital key through communication between the second antenna module and the digital key to control the vehicle, and to identify whether the digital key is inside the vehicle by scanning the inside of the vehicle through the first antenna module to control the vehicle.

Description

Technical Field

[0001] This invention relates to a vehicle controlled by a digital key and a method thereof. Background Technology

[0002] When the user holding the digital key is near the vehicle, the digital key system can open or close the door without inserting the key into the door key slot, or start the vehicle without inserting the key into the vehicle's internal keyhole.

[0003] The digital key system includes i) a process of controlling the vehicle from outside the vehicle by determining the location of the user holding the digital key when the user is outside the vehicle, and ii) a process of controlling the vehicle from inside the vehicle when the digital key enters the vehicle.

[0004] As mentioned above, digital key systems can conveniently control vehicles via wireless communication, but may have difficulty distinguishing between indoor and outdoor areas of the vehicle. Summary of the Invention

[0005] One aspect of the present invention provides a vehicle and its control method, which can realize a digital key system by adding a Bluetooth Low Energy antenna and using wireless Bluetooth Low Energy communication, thereby controlling the vehicle by identifying the distance between the vehicle and the digital key and distinguishing between the indoor and outdoor areas of the vehicle.

[0006] Other aspects of the invention will be set forth in part in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention.

[0007] According to one aspect of the present invention, a vehicle is provided, comprising: a first antenna module located inside the vehicle, including a communication antenna and a communication module; a second antenna module located outside the vehicle, including a communication antenna and a communication module; and a controller configured to control the first antenna module and the second antenna module to communicate wirelessly with each other, and to identify the distance from the vehicle to the digital key through communication between the second antenna module and the digital key to control the vehicle, and to identify whether the digital key is inside the vehicle by scanning the interior of the vehicle through the first antenna module.

[0008] The first antenna module is configured to communicate with the second antenna module in a master-slave configuration, with the first antenna module being the master antenna module and the second antenna module being the slave antenna module.

[0009] The controller is further configured to control the vehicle by wirelessly sharing location data between the second antenna module and the first antenna module, the location data being determined by identifying the distance between the second antenna module and the digital key.

[0010] The controller is further configured to provide passive entry from outside the vehicle based on a digital key located outside the vehicle, identified according to determined location data.

[0011] The controller is further configured to provide passive services from inside the vehicle based on a digital key identified as being located inside the vehicle according to determined location data.

[0012] The second antenna module is configured to directly apply constant power for wireless Bluetooth Low Energy communication with the first antenna module.

[0013] The second antenna module is configured as a shark antenna located on the top of the vehicle and includes a Bluetooth Low Energy module and a Bluetooth Low Energy antenna.

[0014] According to one aspect of the present invention, a method for controlling a vehicle is provided, the vehicle comprising: a first antenna module located inside the vehicle and including a communication antenna and a communication module; and a second antenna module located outside the vehicle and including a communication antenna and a communication module, the control method comprising the steps of: detecting a digital key for wireless communication via the second antenna module; determining a distance to the digital key via the second antenna module when the digital key is detected, including wirelessly communicating with the digital key to control the vehicle; scanning the interior of the vehicle via the first antenna module; and identifying whether the digital key is inside the vehicle via the first antenna module to control the vehicle. Attached Figure Description

[0015] These and / or other aspects of the invention will become apparent and more readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

[0016] Figure 1 This is a view showing a vehicle and a digital key according to an embodiment;

[0017] Figure 2 This is a view showing a detailed configuration of the second antenna module of a vehicle according to an embodiment;

[0018] Figure 3 This is a view illustrating the second antenna module, the first antenna module, and the digital key communicating with a server and the ICU / IBU in the vehicle according to an embodiment;

[0019] Figure 4 This is a control block diagram of a vehicle according to an embodiment;

[0020] Figure 5 This is a view illustrating the process of establishing a connection between the second antenna module, the first antenna module, and the vehicle's digital key according to an embodiment;

[0021] Figure 6 This is a flowchart illustrating vehicle control operations performed from the outside to the inside in a vehicle control method according to an embodiment;

[0022] Figure 7 This is a view illustrating the areas divided by the vehicle according to an embodiment for achieving passive entry; and

[0023] Figure 8 This is a view illustrating the passive access area of ​​a vehicle's second antenna module by adding a wireless Bluetooth Low Energy connection according to an embodiment. Detailed Implementation

[0024] The embodiments described herein and shown in the configuration of the invention are merely preferred embodiments, and it should be understood that they may be replaced by various equivalents and modifications at the time of disclosure.

[0025] Furthermore, similar reference numerals throughout the specification indicate similar components.

[0026] Furthermore, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. It should be understood that the singular form is also intended to include the plural form unless the context clearly indicates otherwise. It is to be further understood that when the terms “comprising,” “including,” and / or “having” are used in this specification, the presence of the stated features, integers, steps, operations, elements, and / or components is defined, but the presence or addition of one or more other undisclosed features, integers, steps, operations, elements, components, and / or combinations thereof is not excluded.

[0027] Furthermore, it should be understood that although the terms first, second, etc., may be used herein to describe various elements, these elements should not be limited by these terms. For example, without departing from the technical spirit or essential characteristics of the invention, a first element may be referred to as a second element, and a second element may also be referred to as a first element. When the conjunction term "and / or" is used to describe an item, the description should be understood to include any and all combinations of one or more of the associated listed items.

[0028] In addition, terms such as “controller,” “machine,” “device,” “module,” “component,” and “block” can refer to a unit used to process at least one function or action. For example, these terms can include at least one of memory and processor, and can refer to at least one process processed by at least one piece of hardware, such as a field-programmable gate array (FPGA) / application-specific integrated circuit (ASIC), or software stored in memory or processor.

[0029] The reference numerals used for method steps are for illustrative purposes only and are not intended to restrict the order of steps. Therefore, unless the context clearly specifies otherwise, written instructions may be executed in other ways.

[0030] Furthermore, embodiments may be implemented via computer-readable code / instructions in / on a medium (e.g., a computer-readable medium) to control at least one processing element to implement any of the exemplary embodiments described above. This medium may be responsive to any medium / media that allows storage and / or transmission of computer-readable code.

[0031] Computer-readable code can be recorded on a medium or transmitted over the Internet. This medium may include read-only memory (ROM), random access memory (RAM), magnetic tape, magnetic disk, flash memory, and optical recording media.

[0032] The operating principles and embodiments will be described in detail below with reference to the accompanying drawings.

[0033] Figure 1 This is a view showing the vehicle 1 and digital key 30 according to an embodiment.

[0034] In existing technology, the vehicle key needs to be inserted into the key slot of the car door to open the door, or the vehicle key needs to be inserted into the keyhole inside the vehicle to start the vehicle.

[0035] However, as Figure 1 As shown, according to the embodiment, vehicle 1 can wirelessly communicate with the digital key 30 held by the user, and when communication is connected, vehicle 1 can unlock the door or start vehicle 1 without inserting the digital key 30.

[0036] Figure 1 This demonstrates that control operations such as unlocking the doors can be performed using wireless communication between the digital key 30 and the second antenna module 20 of the vehicle 1. Information (such as the distance from the vehicle 1 to the digital key 30) can be shared via wireless communication between the second antenna module 20 and the first antenna module 10, and the vehicle 1 can be controlled based on this information.

[0037] Specifically, the distance between the second antenna module 20 and the digital key 30 is identified through wireless communication between the second antenna module 20 and the digital key 30, and the second antenna module 20 can share information such as distance with the first antenna module 10. Data regarding the distance between the second antenna module 20 and the digital key 30 is referred to as location data. When the location data is used to make the digital key 30 a predetermined distance or greater from the second antenna module 20, the digital key 30 is identified as being outside the vehicle 1; and when the distance between the digital key 30 and the second antenna module 20 is less than the predetermined distance, the digital key 30 is identified as being inside the vehicle 1. Therefore, the vehicle 1 can be controlled differently depending on whether the digital key 30 is located outside or inside the vehicle 1.

[0038] As described above, the second antenna module 20 of vehicle 1 can wirelessly communicate with the digital key 30 and the first antenna module 10. In existing designs, generally, the second antenna module 20 wirelessly communicates with the digital key 30, and the location data determined by wireless communication is transmitted to the master controller via a Controller Area Network (CAN) transceiver using CAN communication. However, this design increases the cost of purchasing a CAN transceiver, requires separate microcontroller unit (MCU) resources for CAN communication, may not be able to optimize integrated chip (IC) specifications, and increases the wiring cost and weight of CAN communication. See below for reference. Figure 2 The configuration of the second antenna module 20, which overcomes these shortcomings, is described in detail.

[0039] Figure 2 This is a view showing the detailed configuration of the second antenna module of the vehicle according to an embodiment.

[0040] refer to Figure 2 The diagram shows the components installed inside the second antenna module 20, which can be an existing shark antenna placed outside the vehicle 1. Existing shark antennas include GPS modules, radio modules, LTE modules, etc. Figure 2 The second antenna module 20 adds a Bluetooth Low Energy (BLE) module and BLE antennas 202 and 201. The second antenna module 20 can wirelessly communicate with the first antenna module 10 and the digital key 30 by adding the BLE module and BLE antennas 202 and 201. In this process, constant power can be directly applied instead of CAN communication. Here, the constant power can be a B+ power supply, and can provide 12V DC.

[0041] When applying constant power directly, the CAN transceiver can be omitted. Since no CAN transceiver and CAN communication are used, the cost of purchasing a CAN transceiver is saved. Furthermore, a separate MCU resource for CAN communication is not required, thus optimizing the IC specifications. Additionally, the wiring cost and weight for CAN communication are reduced.

[0042] Therefore, the second antenna module 20 can wirelessly share information such as location data with the first antenna module 10, instead of using wired CAN communication.

[0043] Figure 3 This is a view showing the second antenna module 20, the first antenna module 10, and the digital key 30 communicating with the server 50 and ICU / IBU of the vehicle 1 according to an embodiment.

[0044] refer to Figure 3 , Figure 3The external antenna can be a second antenna module 20, and the internal antenna can be a first antenna module 10. The digital key 30 can wirelessly communicate with the second antenna module 20 of the vehicle 1, and communicate with the server 50 via cellular data.

[0045] First, regarding communication with server 50, digital key 30 may be referred to as a smart key, key fob, etc. Digital key 30 may have multiple buttons or be in the shape of a card. Any device that can open the door of vehicle 1 or start vehicle 1 can be digital key 30, regardless of name or shape. For example, mobile devices such as smartphones, tablet PCs, wearable devices, etc., can be used as digital key 30. In this case, a program or application capable of operating as digital key 30 can be installed on the mobile device. Mobile devices with programs or applications can be sold, or programs or applications can be downloaded from server 50 after sale. Furthermore, in order for the mobile device to operate as digital key 30, an additional authentication process can be performed separately. As described above, digital key 30 can perform account security or authentication operations through communication with server 50, and also performs the management, generation, and deletion of digital key 30.

[0046] Next, regarding communication with the second antenna module 20 of vehicle 1, wireless BLE communication can be used as the communication method. BLE communication can use a Wireless Personal Area Network (WPAN). Compared with other wireless connection methods, using WPAN reduces power consumption. Various types of WPANs exist, such as non-standard independent communication protocols, and the main standardized wireless networks are likely Zigbee and Bluetooth. Bluetooth in BLE communication differs from the Bluetooth standard in existing voice communication. BLE technology operates in an 80MHz frequency band within the 2.400GHz to 2.480GHz range and can be divided into 40 channels at 2MHz intervals. When using wireless BLE communication, the duty cycle is a few milliseconds (ms), it is optically driven, and it is in sleep mode most of the time when not in use, thereby reducing power consumption.

[0047] Communication between the second antenna module 20 and the first antenna module 10 of vehicle 1 can be wireless BLE communication. Furthermore, communication can be performed in a master-slave communication configuration where the first antenna module 10 is the master and the second antenna module 20 is the slave. In this case, master-slave communication can refer to an asymmetric communication model, where a device or process acting as a communication hub (master) controls one or more other devices or processes (slave). Therefore, the first antenna module 10, as the master, can control the second antenna module 20, as the slave.

[0048] The configuration of the second antenna module 20 has been described above. The first antenna module 10 can be installed in an audio, video, navigation, telematics (AVNT) device, which is used in the vehicle's infotainment system. The BLE antenna and BLE module used in the first antenna module 10 can be installed in a separate box. When the BLE antenna and BLE module are installed in a separate box, for example, when the BLE antenna and BLE module are added to the roof of vehicle 1, constant power can be applied directly, just like the second antenna module 20, as described above, and the CAN transceiver can be omitted. Therefore, CAN communication and a CAN transceiver are not used, thus saving the cost of purchasing a CAN transceiver. In addition, a separate MCU resource for CAN communication is not required, thus optimizing the IC specifications. Furthermore, the wiring cost and weight for CAN communication can be reduced. However, since no antenna is installed on the outside of vehicle 1, but a separate box is added inside vehicle 1, the maximum operating distance of the digital key 30 may not be increased because the box is located on the interior ceiling. Therefore, as Figure 3 As shown, when a BLE module and BLE antenna are added, and the second antenna module 20 is installed outside the vehicle 1, the receiving sensitivity and receiving rate of radio waves can be improved, thereby increasing the maximum operating distance of the digital key 30 and improving the coverage range. Before the improvement, the coverage range from the vehicle 1 to the outside was 80m; with the addition of the BLE module and BLE antenna and the installation of the second antenna module 20 outside the vehicle 1, the improved coverage range reaches 300m.

[0049] The first antenna module 10 of vehicle 1 can be connected to the integrated control unit (ICU) and the integrated body unit (IBU) via CAN communication, and can perform vehicle control as the main operation.

[0050] Figure 4 This is a control block diagram of vehicle 1 according to an embodiment.

[0051] refer to Figure 4 According to an embodiment, vehicle 1 may include communicators 100, 200, and 300 to enable the second antenna module 20 and the first antenna module 10 to perform communication, and each of communicators 100, 200, and 300 includes BLE antennas 101, 201, and 301 and BLE modules 102, 202, and 302. Here, the second antenna module 20 is wirelessly connected to a registered digital key 30, and the first antenna module 10 is wirelessly connected to the second antenna module 20.

[0052] Each controller 120, 220, and 320 enables wireless communication between the digital key 30 and the second antenna module 20, as well as wireless communication between the second antenna module 20 and the first antenna module 10. The main controller 400 can control each of the controllers 120, 220, and 320, and can perform different controls on the vehicle 1 when the digital key 30 is located outside the vehicle 1 and inside the vehicle 1, as will be described later.

[0053] Figure 5 This is a diagram illustrating the process of establishing a connection between the second antenna module 20, the first antenna module 10, and the digital key 30 of vehicle 1 according to an embodiment.

[0054] Because the first antenna module 10 and the second antenna module 20, as well as the digital key 30 and the second antenna module 20, respectively perform BLE communication, a connection can be established through a BLE communication connection procedure. Since the digital key 30 and the second antenna module 20 first perform BLE communication outside the vehicle 1, the second antenna module 20 can send an advertising packet to the digital key 30. Then, the first antenna module 10 can send an advertising packet to the second antenna module 20, allowing the second antenna module 20 and the first antenna module 10 to share information such as location data regarding the distance to the digital key 30. Then, the digital key 30, located within the communication range of the second antenna module 20, requests a scan, and the second antenna module 20 responds to the scan request, thereby establishing a communication connection. The first antenna module 10 and the second antenna module 20, located at fixed positions, can be interconnected via a master-slave communication configuration. After connection is established, the digital key 30 can send information such as location data to the second antenna module 20, and the second antenna module 20, acting as a slave, reports power, etc., to the first antenna module 10. Therefore, the area where the digital key 30 is located can be detected. Therefore, control of the vehicle 1 can be performed differently when the digital key 30 is located outside the vehicle 1 and inside the vehicle 1.

[0055] Figure 6 This is a flowchart illustrating vehicle control operations performed from the outside to the inside in a vehicle control method according to an embodiment.

[0056] First, in step 2010, for example, the second antenna module 20 detects whether the digital key 30 is near the vehicle 1. When detected, in step 2020, for example, the second antenna module 20 and the digital key 30 can communicate with each other as described above. Then, for example, in step 2030, the distance from the vehicle 1 to the digital key 30 is identified using location data, and then, for example, in step 2040, the vehicle 1 can be controlled from outside the vehicle 1. Controlling the vehicle 1 from outside the vehicle 1 can include operations such as opening the doors or tailgate or starting the vehicle 1 by the user actively sending a control signal to the vehicle 1 using the digital key 30, and also includes a passive entry function that allows the user to enter the vehicle 1 without sending a control signal using the digital key 30, as long as the user possesses the digital key 30.

[0057] Then, for example, in step 2050, it can be identified whether the digital key 30 has entered the vehicle 1. Specifically, when the location of the digital key 30 is identified using location data and it is determined that the digital key 30 is within a predetermined distance from the vehicle 1, it is determined that the digital key 30 is inside the vehicle 1. When it is identified that the digital key 30 is inside the vehicle 1, the first antenna module 10, which is the master in master-slave communication, becomes master and can scan the interior of the vehicle 1, for example, in step 2060. For example, in step 2070, the vehicle 1 can be controlled by passive services inside the vehicle 1 based on the results of the above scan. In this case, passive services refer to vehicle controls performed inside the vehicle 1 and may include engine start / stop, door lock / unlock, tailgate opening / closing, welcome light operation / disabling, electric sliding door opening / closing, etc.

[0058] As described above, in the system providing the digital key 30, the second antenna module 20 is located externally to the vehicle 1, thereby providing passive entry and passive service. Furthermore, unlike existing systems using the digital key 30, the cost of purchasing a CAN transceiver is saved because location data can be transmitted without using CAN communication. A separate MCU resource for CAN communication is not required, thus optimizing IC specifications. Additionally, the wiring cost and weight for CAN communication are reduced.

[0059] Figure 7 This is a view showing the areas divided by the vehicle 1 according to an embodiment for enabling passive entry. Figure 8 This is a view showing the passive access area of ​​the second antenna module 20 of vehicle 1, according to an embodiment, by adding a wireless Bluetooth Low Energy connection.

[0060] refer to Figure 7The digital key 30 can perform account security or authentication operations through communication with the server 50, and can also perform management, generation, and deletion of the digital key 30. Based on its distance from the vehicle 1, the location of the digital key 30 can be divided into R0, R1, R2, and R3. Since R0 is the area where the distance from the digital key 30 to the vehicle 1 is less than a predetermined distance, it is identified as the interior of the vehicle 1. R1 to R3 refer to areas gradually moving away from the vehicle 1. This division of R1 to R3 is to identify the location moved by the user holding the digital key 30 and to provide different functions based on the identified user location. For example, when the user holding the digital key 30 moves from R3 to R1, the user enters the vehicle 1, thus activating passive entry. When the user moves from R1 to R3, the user moves away from the vehicle 1, thus providing functions such as locking the doors.

[0061] refer to Figure 8 It shows that the first antenna module 10 and the second antenna module 20 realize passive access region 0. Since the grid represented by R0 is identified as the interior of vehicle 1, it provides accurate passive access that distinguishes the interior and exterior of vehicle 1.

[0062] That is, as described above, in order to achieve passive entry zone 0 / 1, the interior and exterior of vehicle 1 can be distinguished through communication between the first antenna module 10 and the second antenna module 20. During the above operation, a constant power can be applied directly to the nearest location of the second antenna module 20, and the CAN transceiver can be omitted. For example, the term "constant power" refers to a power value that deviates from the average value or a predetermined value by less than 5, 4, 3, 2, or 1%. Therefore, by not using a CAN transceiver and CAN communication, the cost of purchasing a CAN transceiver can be saved. Furthermore, a separate MCU resource for CAN communication is not required, thus optimizing the IC specifications. Additionally, the wiring cost and weight for CAN communication can be reduced. Moreover, since the second antenna module 20 is located outside vehicle 1, the maximum operating distance of the digital key 30 can be increased, and the coverage range improved.

[0063] In the vehicle control method of the present invention, the second antenna module 20 detects whether the digital key 30 is near the vehicle 1. When detected, the second antenna module 20 and the digital key 30 can be controlled to communicate with each other as described above. Then, the distance from the vehicle 1 to the digital key 30 is identified using location data, and the vehicle 1 can then be controlled from outside the vehicle 1. Controlling the vehicle 1 from outside the vehicle 1 can include operations such as opening the doors or tailgate or starting the vehicle 1 by the user actively sending a control signal to the vehicle 1 using the digital key 30, and also includes a passive entry function, allowing the user to enter the vehicle 1 without sending a control signal using the digital key 30, as long as the user possesses the digital key 30.

[0064] Then, the system controls whether the digital key 30 has entered the vehicle 1. Specifically, when the location of the digital key 30 is identified using location data and it is determined that the digital key 30 is within a predetermined distance of the vehicle 1, the system controls whether the digital key 30 is inside the vehicle 1. When the digital key 30 is identified as being inside the vehicle 1, the first antenna module 10, acting as the master in master-slave communication, becomes the master and can scan the interior of the vehicle 1. Based on the results of the scan, the vehicle 1 can be controlled via passive services within the vehicle 1. In this case, passive services refer to vehicle controls performed inside the vehicle 1 and may include engine start / stop, door locking / unlocking, tailgate opening / closing, welcome light operation / disabling, electric sliding door opening / closing, etc.

[0065] When controlling vehicle 1 using the above control method, the existing shark antenna provides GPS / radio / LTE reception performance and can identify the interior of vehicle 1. Simultaneously, the functionality of the CAN communication method can be directly implemented using wireless BLE communication. Furthermore, the cost of the CAN transceiver and the wiring for CAN communication can be saved. Additionally, no additional MCU resources are required for CAN communication, thus optimizing IC specifications. Furthermore, the weight of the CAN communication wiring can be reduced.

[0066] As can be seen from the above, according to the embodiments of the present invention, the vehicle and its control method can omit the CAN transceiver while maintaining the passive entry performance of the digital key, thereby saving the cost of purchasing the CAN transceiver and the cost of CAN communication wiring, and reducing the weight of the CAN communication wiring.

[0067] Although embodiments have been described for illustrative purposes, those skilled in the art will understand that various modifications, additions, and substitutions are possible without departing from the scope and spirit of the invention. Therefore, the description of the embodiments is not intended to be limiting.

Claims

1. A vehicle comprising: The first antenna module is located inside the vehicle and includes a communication antenna and a communication module; The second antenna module is located outside the vehicle and includes a communication antenna and a communication module; as well as The controller is configured as follows: Control the first antenna module and the second antenna module to perform wireless communication, and The distance from the vehicle to the digital key is identified through communication between the second antenna module and the digital key, and the digital key is identified by scanning the interior of the vehicle through the first antenna module. The controller is further configured to control the vehicle by wirelessly sharing location data between the second antenna module and the first antenna module, wherein the location data is determined by identifying the distance between the second antenna module and the digital key.

2. The vehicle according to claim 1, wherein the first antenna module is configured to communicate with the second antenna module in a master-slave configuration, the first antenna module being the master antenna module and the second antenna module being the slave antenna module.

3. The vehicle of claim 1, wherein the controller is further configured to provide passive entry from the outside of the vehicle based on the identification of the digital key located outside the vehicle according to determined location data.

4. The vehicle of claim 1, wherein the controller is further configured to provide passive services from within the vehicle based on identifying the digital key located inside the vehicle according to determined location data.

5. The vehicle of claim 1, wherein the second antenna module is configured to directly apply constant power for wireless Bluetooth Low Energy communication with the first antenna module.

6. The vehicle of claim 1, wherein the second antenna module is configured as a shark antenna located on the top of the vehicle and includes a Bluetooth Low Energy module and a Bluetooth Low Energy antenna.

7. A method for controlling a vehicle, the vehicle comprising a first antenna module located inside the vehicle and including a communication antenna and a communication module, and a second antenna module located outside the vehicle and including a communication antenna and a communication module, the control method comprising the following steps: The digital key used for wireless communication is detected by the second antenna module; When the digital key is detected, the second antenna module communicates wirelessly with the digital key to determine the distance to the digital key, thereby controlling the vehicle. The vehicle interior is scanned using the first antenna module; as well as The first antenna module identifies whether the digital key is inside the vehicle in order to control the vehicle. The control method further includes controlling the vehicle by wirelessly sharing location data between the second antenna module and the first antenna module, wherein the location data is determined by identifying the distance between the second antenna module and the digital key.

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