Rear vehicle driving state monitoring based on vehicle rearview mirror and vehicle rearview mirror

Abstract

The invention provides a rear vehicle driving state monitoring method based on a vehicle rearview mirror and the vehicle rearview mirror, a rear vehicle speed detection module and a processor are arranged in the vehicle rearview mirror, and the method comprises the steps that the rear vehicle speed detection module detects driving state data corresponding to a rear vehicle and transmits the driving state data to the processor; and the processor performs vehicle speed early warning on the rear vehicle according to the driving state data, the vehicle speed and a preset alarm rule. According to the method, the driving state of the rear vehicle is captured through the rearview mirror, early warning prompt is carried out, a driver can make more accurate judgment in the processes of lane changing, overtaking and the like, and the driving safety is improved.

Description

Technical Field

[0001] The present application relates to the field of safe driving technology, and in particular to a rear-view mirror-based vehicle driving status monitoring and a vehicle rearview mirror. Background Art

[0002] When driving, knowing the speed of the vehicle behind you is crucial to ensuring driving safety.

[0003] Currently, most rearview mirrors are only used to provide a field of vision. It is difficult for drivers to accurately judge the speed of vehicles behind them when driving at high speeds or changing lanes, increasing the risk of traffic accidents. Summary of the invention

[0004] In view of this, the purpose of this application is to at least provide a method for monitoring the driving status of a rear vehicle based on a vehicle rearview mirror and a vehicle rearview mirror, which can capture the driving status of the rear vehicle through the rearview mirror and provide early warning prompts, thereby helping the driver to make more accurate judgments during lane changing, overtaking, etc., and improving driving safety.

[0005] This application mainly includes the following aspects:

[0006] In the first aspect, an embodiment of the present application provides a method for monitoring the driving status of a rear vehicle based on a vehicle rearview mirror, wherein the vehicle rearview mirror has a built-in rear vehicle speed detection module and a processor, wherein the method includes: the rear vehicle speed detection module detects the driving status data corresponding to the rear vehicle, and transmits the driving status data to the processor; the processor issues a rear vehicle speed warning based on the driving status data, the vehicle speed and preset alarm rules.

[0007] In a possible implementation, the rear vehicle speed detection module includes a radar sensor and a laser sensor, and the driving status data includes reflected wave frequency change data measured by the radar sensor and laser measurement data measured by the laser sensor, wherein the processor performs a rear vehicle speed warning in the following manner: determining the rear vehicle speed based on the reflected wave frequency change data and the laser measurement data; and performing a rear vehicle speed warning based on the rear vehicle speed, the vehicle speed and preset alarm rules.

[0008] In a possible implementation, the vehicle rearview mirror further includes a transparent display screen, which is arranged on the surface of the vehicle rearview mirror. The method further includes: the processor synchronizes the speed of the rear vehicle to the transparent display screen in real time; and the transparent display screen displays the speed of the rear vehicle in a first preset color.

[0009] In one possible implementation, the laser measurement data includes time series data and distance data between the vehicle and the following vehicle, wherein the processor determines the speed of the following vehicle in the following manner: using the Doppler effect formula to calculate the reflected wave frequency change data to determine a first speed corresponding to the following vehicle; calculating a second speed corresponding to the following vehicle based on the time series data and the distance data; and using a Kalman filter or an extended Kalman filter algorithm to fuse the first speed and the second speed to determine the speed of the following vehicle.

[0010] In one possible implementation, the radar sensor is installed at a preset installation position inside the vehicle rearview mirror, which can detect and capture radar measurement data of the rear vehicle; the laser sensor is installed on the side of the vehicle rearview mirror or the bottom of the vehicle rearview mirror so as to accurately scan the rear area of ​​the vehicle.

[0011] In a possible implementation, the preset alarm rules include a correspondence between multiple speed gears and multiple speed alarm thresholds, wherein a rear vehicle speed warning is performed in the following manner: the processor determines a target speed alarm threshold based on the target speed gear to which the vehicle speed belongs and the correspondence; the processor calculates the speed difference between the rear vehicle speed and the vehicle speed; the processor compares the speed difference with the target speed alarm threshold, and if the speed difference is greater than the target speed alarm threshold, an abnormal mark is added to the rear vehicle speed, and an alarm trigger signal and the rear vehicle speed are sent to a preset alarm device; the preset alarm device generates an alarm prompt indicating that the rear vehicle is speeding based on the alarm trigger signal and the rear vehicle speed.

[0012] In a possible implementation, the preset alarm device includes a voice device, and the alarm prompt includes a voice alarm prompt, wherein the alarm prompt is generated in the following manner: the processor sends an alarm trigger signal to the voice device; the voice device generates a voice alarm prompt in response to the alarm trigger signal.

[0013] In a possible implementation, the preset alarm device also includes a transparent display screen, and the alarm prompt also includes a visual alarm prompt, wherein the alarm prompt is generated in the following manner: the processor sends an alarm trigger signal to the transparent display screen; the transparent display screen generates a visual alarm prompt in response to the alarm trigger signal, and the visual alarm prompt includes displaying a preset alarm icon or displaying the speed of the rear vehicle in a second preset color.

[0014] In a possible implementation, the method further includes: the processor sends the real-time collected speed of the rear vehicle to the central controller and the smart terminal via a wireless network for recording.

[0015] In the second aspect, an embodiment of the present application also provides a vehicle rearview mirror, which includes a vehicle speed detection module and a processor, wherein the rear vehicle speed detection module detects driving status data corresponding to the rear vehicle and transmits the driving status data to the processor; the processor issues a rear vehicle speed warning based on the driving status data, the vehicle speed and preset alarm rules.

[0016] The embodiment of the present application provides a rear vehicle driving state monitoring and vehicle rearview mirror based on a vehicle rearview mirror, wherein the vehicle rearview mirror has a built-in rear vehicle speed detection module and a processor, wherein the method includes: the rear vehicle speed detection module detects the driving state data corresponding to the rear vehicle, and transmits the driving state data to the processor; the processor performs a rear vehicle speed warning according to the driving state data, the vehicle speed and the preset alarm rules. The present application realizes the capture of the rear vehicle driving state and provides a warning prompt through the rearview mirror, which helps the driver to make more accurate judgments in the process of changing lanes, overtaking, etc., and improves driving safety.

[0017] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 An interactive flow chart of a method for monitoring the driving status of a following vehicle provided in an embodiment of the present application is shown;

[0020] Figure 2 One of the schematic diagrams of the connection structure of a vehicle rearview mirror provided in an embodiment of the present application is shown;

[0021] Figure 3 A second schematic diagram of the connection structure of a vehicle rearview mirror provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0022] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can be implemented out of sequence, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art, under the guidance of the content of the present application, can add one or more other operations to the flowchart, or remove one or more operations from the flowchart.

[0023] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0024] When driving, knowing the speed of the vehicle behind you is crucial to ensure driving safety. Currently, most rearview mirrors are only used to provide a field of view without integrated speed measurement function. It is difficult for drivers to accurately judge the speed of the vehicle behind them when driving at high speed or changing lanes, increasing the risk of traffic accidents.

[0025] Based on this, the embodiment of the present application provides a rear-vehicle driving status monitoring and vehicle rear-view mirror based on a vehicle rear-view mirror, which can capture the driving status of the rear vehicle and issue an early warning prompt through the rear-view mirror, which helps the driver to make more accurate judgments during lane changing, overtaking, etc., and improve driving safety. The details are as follows:

[0026] See also Figure 1 , Figure 1 The following is an interactive flow chart of a method for monitoring the driving status of a following vehicle provided in an embodiment of the present application. Figure 2 , Figure 2 FIG. 1 shows one of the schematic diagrams of the connection structure of a vehicle rearview mirror provided in an embodiment of the present application. Figure 1 and Figure 2 As shown, the method provided in the embodiment of the present application is applied to a vehicle rearview mirror, the vehicle rearview mirror comprises a rearview mirror body, the rearview mirror body has a built-in rear vehicle speed detection module 1 and a processor 2, the rear vehicle speed detection module 1 and the processor 2 are connected, wherein the method provided in the present application comprises the following steps:

[0027] S100, a rear vehicle speed detection module detects driving status data corresponding to the rear vehicle.

[0028] S200, the rear vehicle speed detection module transmits the driving status data to the processor.

[0029] S300: The processor issues a speed warning for the following vehicle based on the driving status data, the vehicle speed and the preset alarm rules.

[0030] In a specific embodiment, the present application integrates a rear vehicle speed detection module and a processor in the vehicle rearview mirror, collects driving status data corresponding to the rear vehicle through the rear vehicle speed detection module, uses the processor to further process the driving status data, determines the driving status of the rear vehicle, and further combines the vehicle speed and preset alarm rules to complete the rear vehicle speed warning. The rear vehicle speed warning improves the driver's perception of the rear vehicle speed, helps the driver make more accurate judgments during lane changing, overtaking, etc., and helps reduce traffic accidents caused by the driver's failure to pay attention to the speed of the rear vehicle.

[0031] For specific implementation, see Figure 3 , Figure 3 The second schematic diagram of the connection of a vehicle rearview mirror structure provided by an embodiment of the present application is shown. The rear vehicle speed detection module includes a radar sensor 11 and a laser sensor 12, and the driving state data includes the reflected wave frequency change data measured by the radar sensor and the laser measurement data measured by the laser sensor.

[0032] In the present application, the appearance design of the rearview mirror body is similar to that of a traditional rearview mirror, but the vehicle rearview mirror provided in the present application has a space reserved for accommodating a radar sensor inside the mirror surface corresponding to the rearview mirror body, a space reserved for accommodating a laser sensor at the bottom or side of the mirror surface, and a groove for embedding a transparent display screen in the mirror frame.

[0033] Specifically, the radar sensor is installed at a preset installation position inside the vehicle rearview mirror, which can detect and capture radar measurement data of the rear vehicle. The laser sensor is installed on the side of the vehicle rearview mirror or the bottom of the vehicle rearview mirror so as to accurately scan the rear area of ​​the vehicle.

[0034] In this application, the radar sensor selects a millimeter-wave radar sensor with high resolution and long-distance detection capability. In this application, 24GHz and 77GHz radar sensors can be selected. The selected radar sensor can provide accurate measurement within the vehicle speed range.

[0035] In addition, the preset installation position and preset installation angle corresponding to the radar sensor can be determined through a preset speed measurement experiment. For example, a speed measurement experiment is conducted on the rear vehicle at different installation positions and different installation angles corresponding to the radar sensor. The installation position and installation angle corresponding to the most accurate rear vehicle speed are determined as the optimal installation position and optimal installation angle corresponding to the radar sensor. By determining the optimal installation position of the radar sensor through a speed measurement experiment, the radar sensor can obtain the best detection effect.

[0036] The laser sensor is a laser ranging sensor with high precision and short-time response capability, making it suitable for dynamic speed measurement. The installation position of the laser sensor on the vehicle rearview mirror should also consider the emission angle of the laser beam, and further determine a position to avoid the blind spot on the side of the vehicle rearview mirror or at the bottom of the vehicle rearview mirror as the target installation position corresponding to the laser sensor.

[0037] For radar sensors, they measure the frequency changes of reflected waves by emitting electromagnetic waves to the rear vehicle and receiving electromagnetic waves fed back by the rear vehicle, and finally form reflected wave frequency change data. The laser measurement data measured by the laser sensor serves as a supplement to the reflected wave frequency change data. The speed of the rear vehicle is determined by combining the laser measurement data with the reflected wave frequency change data, which can reduce the impact of the measurement error of a single sensor and improve the precision and accuracy of the measurement of the rear vehicle speed.

[0038] In a preferred embodiment, the laser measurement data includes time series data and distance data between the vehicle and the following vehicle. Specifically, the time series data is a time series of the laser sensor collecting the distance between the vehicle and the following vehicle, and the distance data between the vehicle and the following vehicle includes the vehicle distance corresponding to each collection time in the time series data.

[0039] In a specific embodiment, the processor determines the speed of the following vehicle by:

[0040] The Doppler effect formula is used to calculate the reflected wave frequency change data to determine the first speed corresponding to the rear vehicle. The second speed corresponding to the rear vehicle is calculated based on the time series data and distance data. The Kalman filter or extended Kalman filter algorithm is used to fuse the first speed and the second speed to determine the speed of the rear vehicle.

[0041] Preferably, the reflected wave frequency change data acquired by the radar sensor needs to be converted into speed information. Specifically, the Doppler effect formula is used to calculate the first speed corresponding to the rear vehicle by processing the frequency change of the signal returned by the radar.

[0042] In addition, the distance data provided by the laser sensor is combined with the time series data, and the kinematic model is used to calculate the corresponding second speed of the following vehicle, which can improve the stability and accuracy of the measurement.

[0043] In one example, a Kalman filter or an extended Kalman filter algorithm is used to fuse the measurement data from the radar sensor and the laser sensor (laser measurement data and reflected wave frequency change data), and finally determine the speed of the rear vehicle. This can reduce the impact of a single sensor error and improve the accuracy of the rear vehicle speed measurement.

[0044] In a preferred embodiment, if Figure 3 As shown, the vehicle rearview mirror further includes a transparent display screen 3, which is arranged on the surface of the vehicle rearview mirror. The method further includes:

[0045] The processor synchronizes the speed of the rear vehicle to the transparent display screen in real time, and the transparent display screen displays the speed of the rear vehicle in a first preset color.

[0046] In the present application, a transparent display screen is also provided on the surface of the vehicle rearview mirror, and the speed of the rear vehicle is displayed in real time in a first preset color through the transparent display screen to avoid distracting the driver's attention.

[0047] In a preferred embodiment, after starting the vehicle, the vehicle rearview mirror will automatically start and enter a working state. After receiving the vehicle start signal, the transparent display screen displays an initial interface and then starts to display the speed of the rear vehicle.

[0048] In a preferred embodiment, the method provided by the present application further includes:

[0049] The processor sends the real-time collected speed of the following vehicle to the central controller and the intelligent terminal for recording via the wireless network.

[0050] like Figure 3 As shown, the processor of the present application is also connected to the central control system 4 of the vehicle via a wireless network to achieve linkage with other safety systems in the vehicle and improve the overall driving safety of the vehicle. The processor is also connected to a smart terminal (such as a mobile phone) and synchronizes the real-time detected speed of the rear vehicle to the smart terminal 5 so that the driver can view the historical records and real-time data of the speed of the rear vehicle through the application provided by the smart terminal.

[0051] Preferably, the processor of the present application can obtain the speed display signal fed back by the transparent display screen in real time. The speed display signal is used to indicate whether the speed of the rear vehicle is displayed normally. If the speed display signal indicates that the speed of the rear vehicle is not displayed normally, the processor detects the corresponding working status of the radar sensor, laser sensor and transparent display screen, and transmits the abnormal status signal to the smart terminal or the central control system to prompt the driver to detect abnormalities in the radar sensor, laser sensor or transparent display screen.

[0052] In a preferred embodiment, the preset alarm rule includes a correspondence between multiple vehicle speed gears and multiple vehicle speed alarm thresholds, wherein the rear vehicle speed warning is performed in the following manner:

[0053] The processor determines the target speed alarm threshold value according to the target speed gear and the corresponding relationship to which the speed of the own vehicle belongs. The processor calculates the speed difference between the speed of the rear vehicle and the speed of the own vehicle. The processor compares the speed difference with the target speed alarm threshold value. If the speed difference is greater than the target speed alarm threshold value, an abnormal mark is added to the speed of the rear vehicle, and the alarm trigger signal and the speed of the rear vehicle are sent to the preset alarm device. The preset alarm device generates an alarm prompt indicating that the rear vehicle is speeding according to the alarm trigger signal and the speed of the rear vehicle.

[0054] In the present application, according to the speed of the vehicle, it is necessary to first determine the target speed gear to which the speed of the vehicle belongs. Specifically, for example, the speed gear includes a low-speed gear and a high-speed gear. The speed alarm threshold corresponding to the low-speed gear is 30km / h, and the speed alarm threshold corresponding to the high-speed gear is 80km / h. Assuming that the speed of the vehicle belongs to the low-speed gear, if the speed difference between the rear vehicle and the vehicle is greater than 30km / h, the processor starts the alarm and sends the alarm trigger signal and the speed of the rear vehicle to the preset alarm device. Assuming that the speed of the vehicle belongs to the high-speed gear, if the speed difference between the rear vehicle and the vehicle is greater than 80km / h, the processor starts the alarm and sends the alarm trigger signal and the speed of the rear vehicle to the preset alarm device.

[0055] In a preferred embodiment, if Figure 3 As shown, the preset alarm device includes a voice device 6, and the alarm prompt includes a voice alarm prompt, wherein the alarm prompt is generated in the following manner:

[0056] The processor sends an alarm trigger signal to the voice device, and the voice device generates a voice alarm prompt in response to the alarm trigger signal.

[0057] Specifically, when the processor determines that the vehicle speed difference is greater than the target vehicle speed alarm threshold, the processor sends an alarm trigger signal to the voice device. After receiving the alarm trigger signal, the voice device prompts through a voice alarm to inform the driver that he needs to pay attention to the situation of the vehicle behind at this time.

[0058] In another preferred embodiment, the preset alarm device further includes a transparent display screen 3, and the alarm prompt further includes a visual alarm prompt, wherein the alarm prompt is generated in the following manner:

[0059] The processor sends an alarm trigger signal to the transparent display screen, and the transparent display screen generates a visual alarm prompt in response to the alarm trigger signal. The visual alarm prompt includes displaying a preset alarm icon or displaying the speed of the rear vehicle in a second preset color.

[0060] Specifically, when the processor determines that the speed difference is greater than the target speed alarm threshold, the processor also sends an alarm trigger signal to the transparent display screen. After receiving the alarm trigger signal, the transparent display screen changes the speed of the rear vehicle to a second preset color or displays a preset alarm icon to inform the driver that he needs to pay attention to the situation of the rear vehicle at this time.

[0061] When the processor determines that the vehicle speed difference is less than or equal to the target vehicle speed alarm threshold, it indicates that the speed of the rear vehicle is normal, and there is no need to issue a rear vehicle speed alarm.

[0062] In the present application, the transparent display screen may be a touch screen, and a display configuration button may be provided on the vehicle rearview mirror. Different vehicle speed gears and corresponding vehicle speed alarm thresholds may be adjusted through the display configuration button, the touch screen or the smart terminal.

[0063] The benefits of this application are:

[0064] This application can avoid or reduce the risk of rear-end collisions with the rear vehicle, improve the ability to perceive the speed of the rear vehicle, and help the driver make more accurate judgments during lane changes, overtaking, etc.;

[0065] The real-time warning function helps reduce traffic accidents caused by not paying attention to the speed of the vehicle behind;

[0066] Compatibility with vehicle central control systems and smart terminal applications enhances the comprehensive performance of the safety system;

[0067] It improves the vehicle's additional safety functions and the functional safety value of the vehicle itself, bringing core competitiveness to the company's products.

[0068] An embodiment of the present application also provides a vehicle rearview mirror, which includes a vehicle speed detection module and a processor, wherein the rear vehicle speed detection module detects driving status data corresponding to the rear vehicle and transmits the driving status data to the processor; the processor issues a rear vehicle speed warning based on the driving status data, the vehicle speed and preset alarm rules.

[0069] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. In the several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0070] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0071] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0072] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., various media that can store program codes.

[0073] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for monitoring the driving status of a rear vehicle based on a vehicle rearview mirror, characterized in that: The vehicle rearview mirror has a built-in rear vehicle speed detection module and a processor. Wherein, the method comprises: The rear vehicle speed detection module detects driving status data corresponding to the rear vehicle and transmits the driving status data to the processor; The processor performs a speed warning of the following vehicle according to the driving status data, the speed of the own vehicle and the preset alarm rules.

2. The method according to claim 1, characterized in that The rear vehicle speed detection module includes a radar sensor and a laser sensor, and the driving state data includes reflected wave frequency change data measured by the radar sensor and laser measurement data measured by the laser sensor. The processor performs a rear vehicle speed warning in the following manner: determining the speed of the following vehicle according to the reflected wave frequency change data and the laser measurement data; According to the speed of the rear vehicle, the speed of the own vehicle and the preset alarm rules, a rear vehicle speed warning is performed.

3. The method according to claim 2, characterized in that The vehicle rearview mirror further comprises a transparent display screen, which is arranged on the surface of the vehicle rearview mirror. The method further comprises: The processor synchronizes the speed of the rear vehicle to the transparent display screen in real time; The transparent display screen displays the speed of the rear vehicle in a first preset color.

4. The method according to claim 2, characterized in that: The laser measurement data includes time series data and distance data between the vehicle and the following vehicle. Wherein, the processor determines the speed of the rear vehicle in the following manner: The Doppler effect formula is used to calculate the reflected wave frequency change data to determine the first speed corresponding to the rear vehicle; Calculating a second speed corresponding to the rear vehicle according to the time series data and the distance data; The first speed and the second speed are integrated by using a Kalman filter or an extended Kalman filter algorithm to determine the speed of the rear vehicle.

5. The method according to claim 2, characterized in that: The radar sensor is installed at a preset installation position inside the vehicle rearview mirror, and the preset installation position is capable of detecting and capturing radar measurement data of the rear vehicle; The laser sensor is installed on the side of the vehicle rearview mirror or the bottom of the vehicle rearview mirror so as to accurately scan the rear area of ​​the vehicle.

6. The method according to claim 2, characterized in that The preset alarm rule includes a correspondence between a plurality of vehicle speed gears and a plurality of vehicle speed alarm thresholds. Among them, the following vehicle speed warning is carried out in the following ways: The processor determines a target vehicle speed alarm threshold value according to the target vehicle speed gear to which the vehicle speed belongs and the corresponding relationship; The processor calculates a speed difference between the speed of the rear vehicle and the speed of the host vehicle; The processor compares the vehicle speed difference with the target vehicle speed alarm threshold, and if the vehicle speed difference is greater than the target vehicle speed alarm threshold, adds an abnormal mark to the speed of the rear vehicle, and sends an alarm trigger signal and the speed of the rear vehicle to a preset alarm device; The preset alarm device generates an alarm prompt indicating that the rear vehicle is speeding according to the alarm trigger signal and the speed of the rear vehicle.

7. The method according to claim 6, characterized in that The preset alarm device includes a voice device, and the alarm prompt includes a voice alarm prompt. The alarm is generated in the following manner: The processor sends the alarm trigger signal to the voice device; The voice device generates the voice alarm prompt in response to the alarm trigger signal.

8. The method according to claim 6, characterized in that The preset alarm device also includes a transparent display screen, and the alarm prompt also includes a visual alarm prompt. The alarm is generated in the following manner: The processor sends the alarm trigger signal to the transparent display screen; The transparent display screen generates the visual alarm prompt in response to the alarm trigger signal, and the visual alarm prompt includes displaying a preset alarm icon or displaying the speed of the rear vehicle in a second preset color.

9. The method according to claim 6, characterized in that The method further comprises: The processor sends the real-time collected speed of the rear vehicle to the central controller and the intelligent terminal through the wireless network for recording.

10. A vehicle rearview mirror, characterized in that: The vehicle rearview mirror includes a vehicle speed detection module and a processor, Wherein, the rear vehicle speed detection module detects the driving state data corresponding to the rear vehicle and transmits the driving state data to the processor; The processor performs a speed warning of the following vehicle according to the driving status data, the speed of the own vehicle and the preset alarm rules.

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