Vehicle key anti-lost method based on Bluetooth and star flash two-in-one

Abstract

A Bluetooth and star flash two-in-one vehicle key anti-lost method is suitable for searching an intelligent vehicle key with a built-in star flash module and a Bluetooth module, and comprises the following steps: a mobile phone is pre-matched with the vehicle key, and the mobile phone application encrypts and authenticates the vehicle key; when the car key is found, the mobile phone and the car key form first communication connection, and according to the first communication connection, the mobile phone continuously obtains the signal intensity between the mobile phone and the car key; according to the signal intensity, the mobile phone application judges whether the direction searched by the user is correct or not, and calculates and obtains the distance S between the mobile phone and the car key; if the relation that S is smaller than or equal to 20 meters is met, the mobile phone and the car key form second communication connection, and an interaction frame pops up on the mobile phone application; and when the interaction frame is clicked, according to the second communication connection, the mobile phone controls the car key to give out a prompt tone.

Description

Technical Field

[0001] The invention relates to the field of wireless communications, and in particular to a car key anti-loss method based on Bluetooth and Star Flash two-in-one. Background Art

[0002] With the development of wireless communication technology and the increasing demand of users for vehicle experience, more and more smart vehicles have entered the vehicle market. Smart car keys supporting smart vehicles are gradually adopting new generation communication technologies such as Bluetooth and Near Link to replace traditional radio frequency identification (RFID) and near field communication (NFC) technologies. Among them, Near Link technology has a longer communication distance, lower power consumption and faster connection speed than Bluetooth technology.

[0003] As a tool for opening a vehicle, a car key has an inaccessible function. Therefore, once a car key is lost, it will have a serious impact on the safety of the vehicle. At present, a car key with a Bluetooth module can establish a Bluetooth communication connection between a mobile device and a car key through Bluetooth technology. When the owner of the car key searches according to the memory route, the approximate position of the car key can be detected within the Bluetooth coverage range to improve the accuracy of finding the car key. However, the communication connection range of Bluetooth technology is relatively small, usually only within 20 meters. Although a car key with a Star Flash module can quickly establish a communication connection with a mobile device within a range of several hundred meters, the positioning accuracy and stability of Star Flash technology in a small range are not as good as Bluetooth technology, and there will be a problem of low efficiency in a small range.

[0004] Therefore, it is necessary to provide a car key anti-lost method based on Bluetooth and Star Flash two-in-one, which can effectively expand the search range and improve the search efficiency within a small range. Summary of the invention

[0005] The object of the present invention is to provide a car key anti-loss method based on Bluetooth and Star Flash two-in-one, which can effectively expand the search range and improve the search efficiency within a small range.

[0006] According to one aspect of the present application, a car key anti-lost method based on Bluetooth and Star Flash two-in-one is provided, which is suitable for finding a smart car key with a built-in Star Flash module and a Bluetooth module, and the method comprises the steps of:

[0007] The mobile phone is pre-matched with the car key, and the mobile phone application encrypts and authenticates the car key;

[0008] When searching for the car key, the mobile phone forms a first communication connection with the car key, and according to the first communication connection, the mobile phone continuously obtains the signal strength between the mobile phone and the car key;

[0009] According to the signal strength, the mobile phone application determines whether the search direction is correct, and calculates the distance S between the mobile phone and the car key;

[0010] If the relationship is satisfied: S≤20 meters, the mobile phone and the car key form a second communication connection, and an interaction box pops up on the mobile phone application;

[0011] When the interaction box is clicked, the mobile phone controls the car key to emit a prompt sound according to the second communication connection.

[0012] Preferably, the mobile phone is pre-matched with the car key, and the mobile phone applies encryption authentication to the car key, including the steps of:

[0013] The Star Flash SLP function and the wireless Bluetooth function of the mobile phone are turned on, and the mobile phone scans nearby devices;

[0014] The car key is selected in the scanning list, the mobile phone forms a first communication connection and a second communication connection with the car key, and the mobile phone stores the MAC address of the car key;

[0015] The car key is selected in the mobile phone application, and a key is set, so that the mobile phone application is bound to the car key;

[0016] Enter the key, and the mobile phone application determines whether the authentication is correct based on the key;

[0017] If the authentication is correct, when the mobile phone application is started again, the mobile phone application determines whether the car key is within the range according to the MAC address. If so, the mobile phone automatically forms a first communication connection and a second communication connection with the car key.

[0018] Preferably, when searching for the car key, the mobile phone forms a first communication connection with the car key, and according to the first communication connection, the mobile phone continuously obtains the signal strength between the mobile phone and the car key, including the steps of:

[0019] Turn on the Star Flash SLP function of the mobile phone and the mobile phone application;

[0020] If the mobile phone enters the signal range of the Star Flash module, the mobile phone forms a first communication connection with the car key;

[0021] According to the first communication connection, the car key continuously transmits the star flash signal to the mobile phone, and the mobile phone obtains the signal strength.

[0022] Preferably, according to the signal strength, the mobile phone application determines whether the search direction is correct, and calculates and obtains the distance S between the mobile phone and the car key, including the steps of:

[0023] According to the real-time signal strength, calculate and obtain the signal strength change d within the interval time period T;

[0024] According to the signal strength change d, the mobile phone application determines whether the direction in which the user is looking for the car key is correct;

[0025] If the relationship is satisfied: d<0, then the direction is wrong; if the relationship is satisfied: d≥0, then the direction is correct;

[0026] According to the real-time signal strength, the mobile phone application calculates and obtains the real-time distance S.

[0027] More preferably, if the relationship is satisfied: S≤20 meters, the mobile phone forms a second communication connection with the car key, and an interactive box pops up on the mobile phone application, including the steps of:

[0028] When the relationship is satisfied: S≤20 meters, the mobile phone application activates the Bluetooth function of the mobile phone;

[0029] The car key forms a second communication connection with the mobile phone through the Bluetooth module;

[0030] The interaction box pops up in the interface of the mobile phone application.

[0031] Preferably, when the interactive box is clicked, the mobile phone controls the car key to emit a prompt sound according to the second communication connection, including the steps of:

[0032] Click the interactive box, the mobile phone generates a control instruction and transmits it to the car key;

[0033] The vehicle key receives the control command and transmits it to the microphone unit;

[0034] The microphone unit executes the control instruction and emits a prompt sound;

[0035] Find the vehicle key according to the source of the prompt tone.

[0036] More preferably, based on the signal strength change d, the mobile phone application determines whether the direction in which the user is looking for the car key is correct. If the direction is correct, the mobile phone application controls the mobile phone to broadcast a voice message "The direction is correct, please keep going forward"; if the direction is wrong, the mobile phone application controls the mobile phone to broadcast a voice message "The signal is getting weaker, please readjust the direction".

[0037] More preferably, according to the real-time signal strength, the signal strength change d within the interval time period T is calculated and obtained, and the strength change d satisfies the relationship: d=D2-D1;

[0038] Wherein, D1 is the signal strength at the beginning of time period T, and D2 is the signal strength at the end of time period T.

[0039] Preferably, according to the real-time signal strength, the mobile phone application calculates and obtains the real-time distance S, and the calculation formula for calculating the distance S is as follows:

[0040]

[0041] Among them, P T is the transmission power, i.e. the signal strength of the car key at a distance of 1 meter, P R is the signal strength currently received by the mobile phone, and n is the environmental attenuation factor.

[0042] A car key anti-loss system based on Bluetooth and Star Flash two-in-one, the car key anti-loss system based on Bluetooth and Star Flash two-in-one realizes the above-mentioned car key anti-loss method based on Bluetooth and Star Flash two-in-one.

[0043] The present invention has the following beneficial effects:

[0044] When the user is looking for the car key, the Star Flash SLP function is used to form a first communication connection between the mobile phone and the car key, effectively expanding the search range of the car key. When the mobile phone is within a small range of 20 meters or less from the car key, the Bluetooth function is automatically turned on to form a second communication connection with the car key, which improves the accuracy of finding the car key in a small range. The user clicks the interactive box to send a prompt sound and then searches for the car key according to the prompt sound, which simplifies the difficulty of finding and improves the efficiency of searching in a small range. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0046] Figure 1 This is a flow chart of a method for preventing car keys from being lost according to an embodiment of the present application;

[0047] Figure 2 This is a structural block diagram of a car key anti-lost system according to an embodiment of the present application;

[0048] Figure 3 This is a structural block diagram of the mobile phone module in the car key anti-lost system described in one embodiment of the present application;

[0049] Figure 4 This is a structural block diagram of the car key module in the car key anti-lost system according to one embodiment of the present application;

[0050] Figure 5 A schematic diagram of the communication range between the mobile phone module and the car key module in the car key anti-lost system according to one embodiment of the present application;

[0051] Explanation of the accompanying drawings: 100, car key anti-loss system; 10, mobile phone module; 11, signal receiving unit; 12, logic control unit; 13, speaker unit; 14, image display unit; 15, application unit; 20, car key module; 21, information transmitting unit; 22, step-down unit; 23, microphone unit. DETAILED DESCRIPTION

[0052] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0053] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0055] Please refer to Figure 1 - Figure 5 An embodiment of the present application provides a car key anti-lost method based on Bluetooth and Star Flash two-in-one, which is suitable for finding a smart car key with a built-in Star Flash module and a Bluetooth module. The method comprises the steps of:

[0056] The S10 mobile phone is pre-matched with the car key, and the mobile phone application encrypts and authenticates the car key.

[0057] S20: When searching for the car key, the mobile phone forms a first communication connection with the car key. According to the first communication connection, the mobile phone continuously obtains the signal strength between the mobile phone and the car key.

[0058] S30: Based on the signal strength, the mobile phone application determines whether the search direction is correct, and calculates and obtains the distance S between the mobile phone and the car key.

[0059] S40 If the relationship is satisfied: S≤20 meters, the mobile phone and the car key form a second communication connection, and an interaction box pops up on the mobile phone application.

[0060] S50: When the interaction box is clicked, the mobile phone controls the car key to emit a prompt sound according to the second communication connection.

[0061] Among them, Star Flash technology is a new generation of short-range wireless connection technology proposed by Hongmeng Internet of Everything. Compared with Bluetooth technology, Star Flash technology has the advantages of low power consumption, low latency, and long-distance transmission. Compared with Bluetooth, which has a transmission range of only tens of meters, the communication range of Star Flash technology can reach hundreds of meters, because Star Flash technology uses adaptive modulation and coding technology, and the car key with Star Flash module can increase the low-frequency signal of the transmission power, so that the signal can be transmitted farther. Generally, the delay of the car key using Bluetooth communication when communicating with the mobile phone is about 625 milliseconds, and if the car key uses Star Flash technology to communicate, the delay can be greatly reduced to about 20 milliseconds, which allows the mobile phone to quickly establish a communication connection with the car key when it enters the communication range of the car key. In the process of the user looking for the key, the mobile phone will continuously receive the signal sent by the car key, and the signal strength will also change as the user moves. The mobile phone application calculates the distance between the mobile phone and the car key by receiving the real-time signal strength. Based on this calculation, the mobile phone application can provide feedback on the location of the car key to help users confirm whether the search direction is correct.

[0062] In step S10, after the user has the car key, he can pair the car key with the star flash module and the Bluetooth module in the car key through the star flash function and the Bluetooth function of the mobile phone, so that the mobile phone can store the unique identifiers corresponding to the star flash module and the Bluetooth module of the car key. When the user turns on the star flash function or the Bluetooth function in the future, the mobile phone can quickly communicate and connect with the paired car key after scanning it. After the mobile phone is paired with the car key, it can be bound to the car key in the mobile phone application, so that the mobile phone application can be used to assist in finding the car key after the car key is lost.

[0063] Preferably, the mobile phone is pre-matched with the car key, and the mobile phone applies encryption authentication to the car key, including the steps of:

[0064] S11 turns on the Star Flash SLP function and the wireless Bluetooth function of the mobile phone, and the mobile phone scans nearby devices.

[0065] S12: The car key is selected from the scanning list, the mobile phone forms a first communication connection and a second communication connection with the car key, and the mobile phone stores the MAC address of the car key.

[0066] S13: The car key is selected in the mobile application and a key is set, and the mobile application is bound to the car key.

[0067] S14: Input the key, and the mobile phone application determines whether the authentication is correct based on the key.

[0068] If the authentication is correct, in S15, when the mobile phone application is started again, the mobile phone application determines whether the car key is within the range according to the MAC address. If so, the mobile phone automatically forms a first communication connection and a second communication connection with the car key.

[0069] Among them, in step S12, by storing the MAC address of the car key, the mobile phone can uniquely identify the device. This setting ensures that the connection between the car key and the mobile phone is unique and exclusive, avoiding impersonation or interference by other devices. This plays an important role in preventing unauthorized devices from attempting to communicate with the car key. In steps S13-S14, an identity authentication mechanism is introduced by setting up a key system in the mobile phone application to ensure that only authorized mobile phones and car keys can establish a first communication connection and a second communication connection. Entering the key for verification prevents unauthorized devices from accessing the car key, enhancing the user's privacy protection and the security of the anti-loss function. In step S15, when the user starts the mobile phone application again, the system automatically detects whether the car key is within the signal range through the stored MAC address. This automated process simplifies the user's operation and does not require the user to manually select or pair the car key every time.

[0070] Preferably, when searching for the car key, the mobile phone forms a first communication connection with the car key, and according to the first communication connection, the mobile phone continuously obtains the signal strength between the mobile phone and the car key, including the steps of:

[0071] S21 turns on the Star Flash SLP function of the mobile phone and the mobile phone application.

[0072] S22: If the mobile phone enters the signal range of the Star Flash module, the mobile phone forms a first communication connection with the car key.

[0073] S23: According to the first communication connection, the car key continuously transmits the star flash signal to the mobile phone, and the mobile phone obtains the signal strength.

[0074] In step S21, the Star Flash SLP function of the mobile phone is started, so that the mobile phone can scan and receive external Star Flash signals in low power consumption mode. The Star Flash SLP mode has the characteristics of energy saving and can run continuously to monitor device signals. Turning on this mode can ensure that the mobile phone does not consume too much power when looking for car keys, while maintaining signal reception capabilities. In step S21, when the mobile phone enters the effective signal range of the Star Flash module, the mobile phone and the car key can establish a first communication connection. The signal range of the Star Flash module is wider than the Bluetooth signal range. This step ensures that the mobile phone can communicate with the car key at a long distance. This step is especially important when the location of the car key is unknown, because it can help locate the car key within a larger range, has stronger practicality, and can better help users find lost car keys. In step S23, the purpose of continuously obtaining signal strength is to understand the distance and signal changes between the mobile phone and the car key in real time, which can help users judge the direction of approaching or moving away from the car key through changes in signal strength, and promptly remind users of the accuracy of movement, thereby improving the efficiency of users' searches.

[0075] Preferably, according to the signal strength, the mobile phone application determines whether the search direction is correct, and calculates and obtains the distance S between the mobile phone and the car key, including the steps of:

[0076] S31 calculates and obtains the signal strength change d within the interval time period T according to the real-time signal strength.

[0077] S32: Based on the signal strength change d, the mobile phone application determines whether the direction in which the user is looking for the car key is correct.

[0078] If S33 satisfies the relationship: d<0, then the direction is wrong; if it satisfies the relationship: d≥0, then the direction is correct.

[0079] S34: Based on the real-time signal strength, the mobile phone application calculates and obtains the real-time distance S.

[0080] In step S31, the change in signal strength can reflect whether the user is moving towards the car key. If the signal strength increases in a certain direction, it means that the car key is closer in that direction. By calculating the change d, the mobile application can more accurately determine whether the user's direction is correct. In steps S32 and S33, an increase in signal strength (d≥0) indicates that the user is approaching the car key, and a decrease in signal strength (d<0) indicates that the user is moving away from the car key. This judgment helps the user adjust the direction to find the car key. In step S34, through the relationship between real-time signal strength and some known environmental parameters, the mobile application can calculate the current distance S, which provides users with accurate distance information, making the process of finding car keys more intuitive and accurate.

[0081] More preferably, if the relationship is satisfied: S≤20 meters, the mobile phone forms a second communication connection with the car key, and an interactive box pops up on the mobile phone application, including the steps of:

[0082] S41 When the relationship is satisfied: S≤20 meters, the mobile phone application activates the Bluetooth function of the mobile phone.

[0083] S42: the car key forms a second communication connection with the mobile phone through the Bluetooth module.

[0084] S43: The interaction box pops up in the interface of the mobile phone application.

[0085] In steps S41 and S42, when the distance is close, Bluetooth can provide higher communication accuracy and stability than the Star Flash module. Activating the Bluetooth function can provide more reliable signal transmission when the distance is close to the car key, ensuring the smooth progress of subsequent operations, such as issuing a prompt tone. In step S43, the interaction box is used to notify the user of the next operation, such as clicking to trigger the voice of the car key. This interface element provides a user-friendly operation interface, allowing users to easily perform the required operations, further helping to locate the car key.

[0086] Preferably, when the interactive box is clicked, the mobile phone controls the car key to emit a prompt sound according to the second communication connection, including the steps of:

[0087] S51: Click the interaction box, the mobile phone generates a control instruction, and transmits it to the car key.

[0088] In S52, the vehicle key receives the control command and transmits it to the microphone unit.

[0089] S53 The microphone unit executes the control instruction and emits a prompt sound.

[0090] S54 searches for the vehicle key according to the source of the prompt sound.

[0091] In steps S51-S54, the user clicking on the interaction box is a direct means of operation. This step converts the user's intention into a specific control instruction and sends it to the car key. This method is simple and intuitive, and can quickly trigger the voice function of the car key. The microphone unit of the car key is responsible for issuing a prompt sound. Transmitting the control instruction to the microphone unit ensures the correct triggering of the prompt sound. Issuing a prompt sound is a direct way to help users find the car key. The microphone unit is usually a sound system built into the car key, which can emit clear sound in a small space, thereby attracting the user's attention. The prompt sound can provide users with clear positioning clues, allowing users to find the car key faster. Sound is usually easier to convey location in space than visual identification, especially when the object is hidden or far away. For example, when the car key is in a bag or in a corner of the house.

[0092] More preferably, based on the signal strength change d, the mobile phone application determines whether the direction in which the user is looking for the car key is correct. If the direction is correct, the mobile phone application controls the mobile phone to broadcast a voice message "The direction is correct, please keep going forward"; if the direction is wrong, the mobile phone application controls the mobile phone to broadcast a voice message "The signal is getting weaker, please readjust the direction".

[0093] Among them, when the mobile phone application determines that the direction is correct and gives voice prompts, it can prevent users from going astray. When the mobile phone application determines that the direction is wrong and gives voice prompts, it can promptly help users avoid wasting time in the wrong direction, making the positioning process more efficient. Through real-time voice prompts, users can instantly obtain information on whether the direction is correct, avoiding the need to constantly check the mobile phone screen or rely on complex visual signals. This direct sound feedback allows users to focus on the operation of finding car keys. Voice prompts provide clear guidance, reducing users' uncertainty and confusion during the search process. Positive and negative prompts can let users know clearly what actions need to be taken, thereby increasing the success rate of finding car keys.

[0094] Preferably, the signal strength variation d within the interval time period T is calculated based on the real-time signal strength, and the strength variation d satisfies the relationship: d=D2-D1. D1 is the signal strength at the beginning of time period T, and D2 is the signal strength at the end of time period T.

[0095] The change in signal strength d reflects the user's approach or distance from the car key. By monitoring this change in real time, the user's direction and position can be more accurately determined, thereby providing more effective guidance for the user. This calculation method is simple and direct, and can clearly measure the change in signal strength within a specified time period. D1 and D2 represent the signal strength at the start and end of the time period, respectively, and d=D2-D1 calculates the net change in signal strength during this period. By calculating the change in signal strength within the time period T, the fluctuation of signal strength can be monitored in real time. This dynamic monitoring allows the system to respond to changes in the user's position in a timely manner and improve the accuracy of car key positioning.

[0096] Preferably, according to the real-time signal strength, the mobile phone application calculates and obtains the real-time distance S, and the calculation formula for calculating the distance S is as follows:

[0097]

[0098] Among them, P T is the transmission power, i.e. the signal strength of the car key at a distance of 1 meter, P R is the signal strength currently received by the mobile phone, and n is the environmental attenuation factor.

[0099] According to the steps S01-S05, this specific implementation provides a specific example to simulate the process of a user looking for a car key:

[0100] Example scenario:

[0101] The user is looking for the car key in an open outdoor environment. Both the car key and the mobile phone support Bluetooth and Star Flash connection, and the mobile phone application has been bound to the car key.

[0102] Instance parameter settings:

[0103] The maximum radius of the Star Flash communication area range R1 is 500 meters.

[0104] The maximum radius of the Bluetooth communication area R2 is 20 meters.

[0105] The value of the environmental attenuation factor n is 3.

[0106] The transmission power of the car key is 0dBm.

[0107] The real-time signal strength D1 received by the mobile phone at time t1 in the scene is -70dBm.

[0108] The real-time signal strength D2 received by the mobile phone at time t2 in the scene is -65dBm.

[0109] The real-time signal strength D3 received by the mobile phone at time t3 in the scene is -60dBm.

[0110] The time period T from time t1 to time t2 is 5 seconds.

[0111] Example process:

[0112] 1. The user opens the mobile app in the parking lot and enables the Star Flash function of the mobile phone. The mobile phone establishes a communication connection with the car key by scanning the Star Flash signal of the car key, and the mobile app begins to continuously obtain the signal strength of the car key.

[0113] 2. The mobile phone application determines whether the user is looking for the right direction by the change in the intensity of the star flash signal. The mobile phone obtains D1 and D2 in the time period T respectively. The signal strength change d=D2-D1=5dBm can be calculated by the formula. Because the relationship d>0 is satisfied, the overall direction of the user's movement in the time period T2 is correct.

[0114] 3. The mobile phone application continuously calculates the distance S between the mobile phone and the car key based on the acquired signal strength. Taking time t3 as an example, the calculation formula is as follows:

[0115]

[0116] 4. When the mobile phone application detects that the distance S meets the condition of S≤20 meters, the mobile phone application automatically controls the activation of the Bluetooth function of the mobile phone and establishes communication with the Bluetooth module of the car key.

[0117] 5. After the Bluetooth connection is established, an interactive box pops up on the mobile app interface, prompting the user to click to proceed to the next step. The user clicks the interactive box, and the mobile phone sends a control command to the car key via Bluetooth, instructing the car key to emit a prompt tone. The car key's microphone receives the command and emits a prompt tone to help the user determine the specific location of the car key.

[0118] A car key anti-lost system based on Bluetooth and Star Flash two-in-one, the system comprising:

[0119] The mobile phone module searches for the car key module according to the signal transmitted by the car key module.

[0120] The car key module transmits a signal to the mobile phone module to communicate with the mobile phone module.

[0121] Among them, the mobile phone module includes:

[0122] The signal receiving unit receives the star flash signal or Bluetooth signal emitted by the car key.

[0123] The logic control unit determines whether the direction the user is looking for is correct and calculates the distance between the car key and the mobile phone.

[0124] The speaker unit broadcasts a prompt tone to remind the user whether the direction is correct.

[0125] The image display unit displays pop-up windows and provides a visual interface to users.

[0126] The application unit is used to bind the car key, control the speaker to broadcast the voice, and control the car key module to emit a prompt tone.

[0127] Among them, the car key module includes:

[0128] The signal transmitting unit sends star flash signals or Bluetooth signals to the mobile phone.

[0129] The step-down unit is used to reduce the supply voltage of the vehicle key module.

[0130] The microphone unit emits a prompt sound to facilitate users to find the car keys.

[0131] Among them, the signal receiving unit and the signal transmitting unit both use the HiSilicon Hi2825 chip and combine with other peripheral circuits to realize the Star Flash SLP connection and Bluetooth wireless connection between the car key and the mobile phone. The chip has the characteristics of low power consumption, high performance, and fast response. The HiSilicon Hi2825 chip supports BLE5.0 and Star Flash 1.0 specifications, and also supports the SM4 encryption and decryption algorithm. The SM4 encryption and decryption algorithm is a national standard encryption algorithm that is often used to ensure data security during communication. The SM4 encryption and decryption algorithm can ensure the communication security between the car key and the mobile phone and prevent data from being tampered with or eavesdropped. The HiSilicon Hi2825 chip also integrates efuse inside, which greatly improves the security of the hardware. The signal transmitting unit is powered by a button battery inside the car key, and the required voltage of the HiSilicon Hi2825 chip is 2.5-4.5V, so the car key uses the LM-1117 voltage regulator chip as a step-down unit to realize 5V to 3.3V, and the maximum current of the LM-1117 voltage regulator chip is 0.8A, which is enough to support the power supply of the signal transmitting unit. The microphone unit uses the SSC8164GS6 MOS tube combined with other peripheral devices to drive the microphone to emit a prompt sound.

[0132] In this way, when the user is looking for the car key, the Star Flash SLP function is used to form a first communication connection between the mobile phone and the car key, effectively expanding the search range of the car key. When the mobile phone is within a small range of 20 meters or less from the car key, the Bluetooth function is automatically turned on to form a second communication connection with the car key, which improves the accuracy of finding the car key in a small range. The user clicks the interactive box to send a prompt sound and then searches for the car key according to the prompt sound, which simplifies the difficulty of finding and improves the efficiency of searching in a small range.

[0133] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A car key anti-lost method based on Bluetooth and Star Flash two-in-one, suitable for finding smart car keys with built-in Star Flash module and Bluetooth module, It is characterized in that The method comprises the steps of: The mobile phone is pre-matched with the car key, and the mobile phone application encrypts and authenticates the car key; When searching for the car key, the mobile phone forms a first communication connection with the car key, and according to the first communication connection, the mobile phone continuously obtains the signal strength between the mobile phone and the car key; According to the signal strength, the mobile phone application determines whether the search direction is correct, and calculates the distance S between the mobile phone and the car key; If the relationship is satisfied: S≤20 meters, the mobile phone and the car key form a second communication connection, and an interaction box pops up on the mobile phone application; When the interaction box is clicked, the mobile phone controls the car key to emit a prompt sound according to the second communication connection.

2. A car key anti-lost method based on Bluetooth and Star Flash two-in-one according to claim 1, It is characterized in that The mobile phone is pre-matched with the car key, and the mobile phone application encrypts and authenticates the car key, including the steps of: The Star Flash SLP function and the wireless Bluetooth function of the mobile phone are turned on, and the mobile phone scans nearby devices; The car key is selected in the scanning list, the mobile phone forms a first communication connection and a second communication connection with the car key, and the mobile phone stores the MAC address of the car key; The car key is selected in the mobile phone application, and a key is set, so that the mobile phone application is bound to the car key; Enter the key, and the mobile phone application determines whether the authentication is correct based on the key; If the authentication is correct, when the mobile phone application is started again, the mobile phone application determines whether the car key is within the range according to the MAC address. If so, the mobile phone automatically forms a first communication connection and a second communication connection with the car key.

3. A car key anti-lost method based on Bluetooth and Star Flash two-in-one according to claim 1, It is characterized in that When searching for the car key, the mobile phone forms a first communication connection with the car key. According to the first communication connection, the mobile phone continuously obtains the signal strength between the mobile phone and the car key, including the steps of: Turn on the Star Flash SLP function of the mobile phone and the mobile phone application; If the mobile phone enters the signal range of the Star Flash module, the mobile phone forms a first communication connection with the car key; According to the first communication connection, the car key continuously transmits the star flash signal to the mobile phone, and the mobile phone obtains the signal strength.

4. A car key anti-lost method based on Bluetooth and Star Flash two-in-one according to claim 1, It is characterized in that According to the signal strength, the mobile phone application determines whether the search direction is correct, and calculates and obtains the distance S between the mobile phone and the car key, including the steps of: According to the real-time signal strength, calculate and obtain the signal strength change d within the interval time period T; According to the signal strength change d, the mobile phone application determines whether the direction in which the user is looking for the car key is correct; If the relationship is satisfied: d<0, then the direction is wrong; if the relationship is satisfied: d≥0, then the direction is correct; According to the real-time signal strength, the mobile phone application calculates and obtains the real-time distance S.

5. A car key anti-lost method based on Bluetooth and Star Flash two-in-one according to claim 1, It is characterized in that If the relationship is satisfied: S≤20 meters, the mobile phone and the car key form a second communication connection, and an interactive box pops up on the mobile phone application, including the steps of: When the relationship is satisfied: S≤20 meters, the mobile phone application activates the Bluetooth function of the mobile phone; The car key forms a second communication connection with the mobile phone through the Bluetooth module; The interaction box pops up in the interface of the mobile phone application.

6. A car key anti-lost method based on Bluetooth and Star Flash two-in-one according to claim 1, It is characterized in that When the interaction box is clicked, the mobile phone controls the car key to emit a prompt sound according to the second communication connection, including the steps of: Click the interactive box, the mobile phone generates a control instruction and transmits it to the car key; The vehicle key receives the control command and transmits it to the microphone unit; The microphone unit executes the control instruction and emits a prompt sound; Find the vehicle key according to the source of the prompt tone.

7. A car key anti-lost method based on Bluetooth and Star Flash two-in-one according to claim 4, It is characterized in that According to the signal strength change d, the mobile phone application determines whether the direction in which the user is looking for the car key is correct. If the direction is correct, the mobile phone application controls the mobile phone to broadcast the voice "The direction is correct, please keep moving forward"; if the direction is wrong, the mobile phone application controls the mobile phone to broadcast the voice "The signal is getting weak, please readjust the direction".

8. A car key anti-lost method based on Bluetooth and Star Flash two-in-one according to claim 4, It is characterized in that According to the real-time signal strength, the signal strength change d within the interval time period T is calculated and obtained, and the strength change d satisfies the relationship: d=D2-D1; Wherein, D1 is the signal strength at the beginning of time period T, and D2 is the signal strength at the end of time period T.

9. A car key anti-lost method based on Bluetooth and Star Flash two-in-one according to claim 1, It is characterized in that According to the real-time signal strength, the mobile phone application calculates and obtains the real-time distance S. The calculation formula for calculating the distance S is as follows: Among them, P T is the transmission power, i.e. the signal strength of the car key at a distance of 1 meter, P R is the signal strength currently received by the mobile phone, and n is the environmental attenuation factor.

10. A car key anti-lost system based on Bluetooth and Star Flash two-in-one, It is characterized in that The car key anti-loss system based on Bluetooth and Star Flash two-in-one realizes the car key anti-loss method based on Bluetooth and Star Flash two-in-one as described in any one of claims 1 to 9.

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