Vehicle speed flashing method and vehicle diagnostic apparatus

Abstract

The invention discloses a vehicle speed flashing method and a vehicle diagnostic agent.The vehicle speed flashing method comprises the steps that after it is determined that a vehicle-mounted OBD interface is connected, state parameters of a truck are obtained; after the state parameters meet the data interaction conditions, the speed adjustment coefficient of the truck is written into the automobile data recorder. The method comprises the following steps: after determining that a vehicle diagnostic instrument is connected with a vehicle-mounted OBD (On Board Diagnostics) interface of a truck, writing a speed adjustment coefficient of the truck into an automobile data recorder so as to calibrate the vehicle speed displayed on a new man-machine interaction interface of the truck; and the one-time passing rate of program flashing is improved to meet the requirement of the one-time passing rate of factory program flashing.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a vehicle speed flashing method and a vehicle diagnostic instrument. Background Art

[0002] Before a truck leaves the factory, the speed displayed on the instrument panel of the truck driving recorder needs to be calibrated to ensure that the speed displayed on the instrument panel meets industry standards. The traditional human-computer interaction interface can write data through program settings to complete the speed calibration, but the module used for speed calibration in the new human-computer interaction interface has no CAN bus connection and data cannot be written through the program. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to propose a vehicle speed flashing method, which, after determining that the vehicle diagnostic instrument is connected to the on-board OBD (On Board Diagnostics) interface of the truck, flashes the speed adjustment coefficient of the truck into the driving recorder to calibrate the speed displayed on the new human-computer interaction interface of the truck, and improves the one-time pass rate of program flashing to meet the one-time pass rate requirement of the factory program flashing.

[0004] A second object of the present invention is to provide a vehicle diagnostic instrument.

[0005] In order to solve the above problems, an embodiment of the first aspect of the present invention provides a vehicle speed flashing method for a vehicle diagnostic instrument. The vehicle speed flashing method includes obtaining the status parameters of the truck after determining that it is connected to the vehicle-mounted OBD interface; after the status parameters meet the data interaction conditions, the speed adjustment coefficient of the truck is flashed into the driving recorder.

[0006] According to the vehicle speed flashing method of the embodiment of the present invention, after the vehicle diagnostic instrument determines that it is connected to the on-board OBD interface of the truck, the vehicle diagnostic instrument can obtain the status parameters of the truck through the on-board OBD interface, and after determining that the status parameters meet the data interaction conditions, the speed adjustment coefficient of the truck is flashed into the driving recorder. On the one hand, the vehicle speed displayed on the new human-computer interaction interface of the truck is calibrated so that the displayed vehicle speed meets the industry specifications; on the other hand, the one-time pass rate of the factory program flashing is improved to meet the requirement of the one-time pass rate of the factory program flashing.

[0007] In some embodiments, the state parameters include at least a power-on state parameter and a vehicle gear state parameter.

[0008] In some embodiments, the vehicle diagnostic instrument is configured with a vehicle speed flash application software, and determining whether it is connected to the vehicle-mounted OBD interface includes: starting the vehicle speed flash application software; under the vehicle speed flash application software, triggering a connection diagnostic instruction; in response to the connection diagnostic instruction, displaying a data read and write command column, thereby determining whether it is connected to the vehicle-mounted OBD interface.

[0009] In some embodiments, before writing the speed adjustment coefficient of the truck into the driving recorder, the method further includes: triggering a start diagnostic session instruction in the data read and write command sequence to enter a data writing mode.

[0010] In some embodiments, before entering the data writing mode, the method further includes: triggering and displaying a data writing channel selection interface under the vehicle speed writing application software; and determining a target data writing channel for writing the speed adjustment coefficient according to the data writing channel selection interface.

[0011] In some embodiments, writing the speed adjustment coefficient of the truck into the driving recorder includes: triggering a speed adjustment coefficient write instruction in the data read and write command column when entering a data write mode; displaying a speed adjustment coefficient list in response to the speed adjustment coefficient write instruction; selecting a speed adjustment coefficient corresponding to the truck from the speed adjustment coefficient list; and writing the selected speed adjustment coefficient into the driving recorder.

[0012] In some embodiments, the method further includes: triggering a vehicle identification number write instruction in the data read and write command column when entering a data write mode; displaying a vehicle identification number list in response to the vehicle identification number write instruction; selecting a vehicle identification number corresponding to the truck from the vehicle identification number list; and writing the selected vehicle identification number into the driving recorder.

[0013] In some embodiments, before displaying the speed adjustment coefficient list, the method also includes: obtaining the rear axle speed ratio, tire rolling diameter and number of gearbox teeth of the truck; determining a preset vehicle speed error coefficient; and determining the speed adjustment coefficient based on the rear axle speed ratio, the tire rolling diameter, the number of gearbox teeth and the preset vehicle speed error coefficient.

[0014] The second aspect of the present invention proposes a vehicle diagnostic instrument, comprising: at least one processor; a memory communicatively connected to at least one of the processors; wherein the memory stores a computer program executable by at least one of the processors, and when at least one of the processors executes the computer program, the vehicle speed flashing method of the above embodiment is implemented.

[0015] In some embodiments, the vehicle diagnostic instrument further includes an interactive screen, and the interactive screen is used for human-computer interaction.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a flow chart of a vehicle speed flashing method according to an embodiment of the present invention; Figure 2 is one of the schematic diagrams of the vehicle speed flashing application software of the vehicle diagnostic instrument according to one embodiment of the present invention; Figure 3 This is a second schematic diagram of the vehicle speed flashing application software of the vehicle diagnostic instrument according to an embodiment of the present invention; Figure 4 This is a third schematic diagram of the vehicle speed flashing application software of the vehicle diagnostic instrument according to an embodiment of the present invention; Figure 5 This is a fourth schematic diagram of the vehicle speed flashing application software of the vehicle diagnostic instrument according to an embodiment of the present invention; Figure 6 This is a fifth schematic diagram of the vehicle speed flashing application software of the vehicle diagnostic instrument according to an embodiment of the present invention; Figure 7 This is a sixth schematic diagram of the vehicle speed flashing application software of the vehicle diagnostic instrument according to an embodiment of the present invention; Figure 8 This is a seventh schematic diagram of the vehicle speed flashing application software of the vehicle diagnostic instrument according to an embodiment of the present invention; Fig. 9 This is a schematic diagram of the vehicle speed flashing application software of the vehicle diagnostic instrument according to an embodiment of the present invention. Fig.10 4 is a structural block diagram of a vehicle diagnostic instrument according to an embodiment of the present invention.

[0018] Reference numerals: Vehicle diagnostic instrument 100; Processor 10; Memory 20. DETAILED DESCRIPTION

[0019] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0020] In order to solve the above problems, a first embodiment of the present invention proposes a vehicle speed flashing method. After determining that the vehicle diagnostic instrument is connected to the on-board OBD (On Board Diagnostics) interface of the truck, the method flashes the speed adjustment coefficient of the truck into the driving recorder to calibrate the vehicle speed displayed on the new human-computer interaction interface of the truck, and improves the one-time pass rate of the program flashing to meet the one-time pass rate requirement of the factory program flashing.

[0021] Reference below Figure 1 A vehicle speed calibration method according to an embodiment of the present invention is described. The vehicle speed calibration method includes steps S1 to S2. The specific steps are as follows.

[0022] Step S1, after determining the connection with the vehicle-mounted OBD interface, obtain the state parameters of the truck.

[0023] Specifically, after the vehicle diagnostic instrument confirms that it is connected to the vehicle OBD interface, the vehicle diagnostic instrument can obtain the vehicle status parameters through the vehicle OBD interface, and then the vehicle diagnostic instrument can determine whether the program can be successfully flashed through the truck status parameters. The truck status parameters may include information such as engine speed, vehicle gear status, vehicle driving speed, power-on status parameters, etc., which are not specifically limited here.

[0024] Step S2, after the state parameters meet the data exchange conditions, the speed adjustment coefficient of the truck is written into the driving recorder.

[0025] Among them, the speed adjustment coefficient refers to the number of pulses generated by the vehicle speed sensor per kilometer.

[0026] Specifically, the vehicle diagnostic instrument determines whether the vehicle status parameters meet the data interaction conditions. If the data interaction conditions are met, it means that the current driving recorder is in a state that allows data to be written. Conversely, if the data interaction conditions are not met, it means that the current driving recorder is in a state that does not allow data to be written. Then, after the data interaction conditions are met, the speed adjustment coefficient of the truck is written into the driving recorder to avoid failure when writing the program, thereby improving the one-time writing pass rate of the program to meet the one-time writing pass rate requirements of the factory program, and realizing the speed calibration of the speed displayed on the new human-computer interaction interface of the truck, so that the speed displayed by the truck meets the industry standards. Among them, the data interaction condition is a pre-set vehicle status that allows data interaction between the vehicle diagnostic instrument and the driving recorder. For example, the data interaction condition can be that the vehicle gear state is the parking gear and the vehicle speed is 0 and the power-on state parameter is that the vehicle is powered on, or, while ensuring that the speed adjustment coefficient can be correctly written and safe, other data interaction conditions can also be set based on actual conditions, and there is no restriction on this.

[0027] According to the vehicle speed flashing method of the embodiment of the present invention, after the vehicle diagnostic instrument determines that it is connected to the on-board OBD interface of the truck, the vehicle diagnostic instrument can obtain the status parameters of the truck through the on-board OBD interface, and after determining that the status parameters meet the data interaction conditions, the speed adjustment coefficient of the truck is flashed into the driving recorder. On the one hand, the vehicle speed displayed on the new human-computer interaction interface of the truck is calibrated so that the displayed vehicle speed meets industry standards; on the other hand, the one-time pass rate of the factory program flashing is improved to meet the requirement of the one-time pass rate of the factory program flashing.

[0028] In some embodiments, the state parameters include at least a power-on state parameter and a vehicle gear state parameter.

[0029] Specifically, the stability of the truck power supply is determined by the power-on status parameters to avoid writing failure due to power outage when the truck speed adjustment coefficient is being written into the driving recorder. The vehicle driving status is determined by the vehicle gear status parameters to avoid danger when the truck speed adjustment coefficient is being written into the driving recorder while the vehicle is driving.

[0030] In some embodiments, the vehicle diagnostic instrument is configured with a vehicle speed flashing application software, and determining whether it is connected to the vehicle-mounted OBD interface includes starting the vehicle speed flashing application software; under the vehicle speed flashing application software, triggering a connection diagnostic instruction; in response to the connection diagnostic instruction, displaying a data read and write command column, thereby determining whether it is connected to the vehicle-mounted OBD interface.

[0031] Specifically, after the vehicle diagnostic instrument is connected to the on-board OBD interface, the vehicle speed flashing application software is started on the vehicle diagnostic instrument, and a communication connection is established with the on-board OBD interface by triggering a connection diagnostic command. If the vehicle diagnostic instrument and the on-board OBD interface complete the communication connection, the vehicle speed flashing application software will display a data read and write command column to prompt the user that the connection between the vehicle diagnostic instrument and the on-board OBD interface is complete.

[0032] In some embodiments, before writing the speed adjustment coefficient of the truck into the driving recorder, the method further includes triggering a start diagnostic session instruction in a data read / write command sequence to enter a data write mode.

[0033] Specifically, the speed adjustment coefficient of the truck can be written into the driving recorder only in the data writing mode, thereby avoiding data writing without user permission, which causes the failure of the writing program. If the command column corresponding to the truck's driving recorder appears in the command column, it means that the truck's driving recorder is connected; if it does not appear, it is necessary to check the connection with the truck's driving recorder and try the above process again.

[0034] In some embodiments, before entering the data writing mode, the method also includes triggering and displaying a data writing channel selection interface under the vehicle speed writing application software; and determining a target data writing channel for writing the speed adjustment coefficient according to the data writing channel selection interface.

[0035] Specifically, in order to ensure efficiency and accuracy during the data writing process, specific data will use its corresponding data flash channel during the writing process. Therefore, the present application is set to trigger and display the data flash channel selection interface before the data writing mode. The user selects the corresponding target data flash channel according to the current flash speed adjustment coefficient to ensure smooth data writing, thereby improving the success rate of the flash program.

[0036] In some embodiments, the speed adjustment coefficient of the truck is written into the driving recorder, including triggering a speed adjustment coefficient write instruction in a data read and write command column when entering a data write mode; displaying a speed adjustment coefficient list in response to the speed adjustment coefficient write instruction; selecting a speed adjustment coefficient corresponding to the truck according to the speed adjustment coefficient list; and writing the selected speed adjustment coefficient into the driving recorder.

[0037] Specifically, the vehicle diagnostic instrument pre-stores a plurality of different speed adjustment coefficients corresponding to different truck models. The user selects the speed adjustment coefficient corresponding to the current truck model according to the speed adjustment coefficient list displayed by the vehicle diagnostic instrument, and then the vehicle diagnostic instrument can write the selected speed adjustment coefficient into the driving recorder.

[0038] In some embodiments, the vehicle speed flashing method also includes triggering a vehicle identification number write instruction in the data read and write command column when entering the data write mode; displaying a vehicle identification number list in response to the vehicle identification number write instruction; selecting a vehicle identification number corresponding to the truck according to the vehicle identification number list; and flashing the selected vehicle identification number into the driving recorder.

[0039] The following is an example of the speed adjustment coefficient flashing process of a truck based on the speed flashing method of the present application. Specifically, taking the H6B model as an example, the user uses a wiring harness assembly to connect the truck's driving recorder and the truck's on-board OBD interface, and cooperates with the adapter to achieve connection with the vehicle diagnostic instrument, and starts the vehicle speed flashing application software of the vehicle diagnostic instrument, such as Figure 2 As shown, the vehicle diagnostic instrument interactive screen will pop up to select channel 1 (channels), and click to access symbolic channel 2 (open symbolic channel), such as Figure 3 As shown, select Mtco_F option 3 in the pop-up data flash channel selection interface, then select option 4 corresponding to terminal 14 of the first wiring terminal for the target data flash channel for flashing the speed adjustment coefficient and confirm. Figure 4 As shown, click the connection diagnostic command 5, i.e., int Channel, and a data read and write command column, i.e., the MTCO_F command column, will appear on the right side of the screen. If the command column corresponding to the truck's driving recorder appears in the data read and write command column, it means that the truck's driving recorder has been connected; if not, you need to check the connection between the wiring harness assembly and the truck's driving recorder and try the above process again.

[0040] Then, you need to switch to diagnostic mode. Select diagnostic session command 7 (FN_start Diagnostic Session) in the data read and write command column and click Send command 6 to start diagnostic mode. Figure 5 As shown, select instruction 8, i.e. ECU Programming Mode, and click on instruction 9, i.e. Prepare, to enter the data writing mode; Figure 6 As shown, in the data writing mode, select the speed adjustment factor writing instruction 11, i.e., FN_vehicle Speed ​​Factor command and click the send instruction 6 to send. In the pop-up dialog box, enter the speed adjustment factor list profidata to find the speed adjustment factor K value corresponding to this vehicle. For example, the K value is 6631l / km. After clicking Prepare, confirm that the K value has been written through the K value prompt instruction 12. Thus, the writing of the speed adjustment factor K value is completed. Then, as shown in FIG. Figure 7 As shown, select the vehicle identification number write instruction 13 in the data read and write command column, namely FN_vehicle Identification Number, and select send instruction 6. In the pop-up dialog box, enter the corresponding vehicle identification number VIN found from the vehicle identification number list profidata. For example, the vehicle identification number VIN is LRDS7PEB2PG002508. After clicking Prepare, confirm that the VIN has been written through the VIN prompt instruction 14. At this point, the writing of the vehicle identification code VIN is completed. Finally, as shown in the figure below: Figure 8 As shown, select the diagnostic mode exit instruction 15, i.e. Exit Channel, and the diagnostic mode close instruction 16, i.e. Close Channel, in sequence to exit the diagnostic mode. Fig. 9 After selecting the file instruction 16, select the exit instruction 17 in the pop-up list to exit the vehicle speed flashing application software of the vehicle diagnostic instrument, and the flashing of the speed adjustment coefficient and the vehicle identification code is completed.

[0041] Finally, the vehicle speed can be tested. The structure of the present application can realize the vehicle speed flashing function, and the actual speed that meets the regulatory requirements is never higher than the speed displayed on the instrument, and the actual speed is not lower than 5% of the speed displayed on the instrument.

[0042] In some embodiments, before displaying the speed adjustment coefficient list, the method also includes obtaining the rear axle speed ratio, tire rolling diameter and number of transmission teeth of the truck; determining a preset vehicle speed error coefficient; and determining the speed adjustment coefficient based on the rear axle speed ratio, tire rolling diameter, number of transmission teeth and preset vehicle speed error coefficient.

[0043] Specifically, the speed adjustment coefficient is the number of pulses generated by the vehicle speed sensor per kilometer. The number of pulses generated by the vehicle speed sensor each time it rotates is fixed. Therefore, the number of pulses generated by the vehicle speed sensor each time it completes a rotation is determined by the number of gearbox teeth, and the truck travel distance when the vehicle speed sensor completes a rotation is determined. The truck mileage can be calculated based on the total number of pulses within a certain period of time, and finally the speed adjustment coefficient is calculated by combining the rear axle speed ratio and the vehicle speed error adjustment coefficient. The present invention determines the speed adjustment coefficient based on the rear axle speed ratio, the tire rolling diameter, the number of gearbox teeth and the preset vehicle speed error coefficient as shown in reference formula (1). Among them, k is the speed adjustment coefficient, C is the tire rolling diameter, N is the number of gearbox teeth, and PPK is the rear axle speed ratio.

[0044] Formula (1) For example, referring to Table 1, Table 1 is a schematic diagram of a speed adjustment coefficient list, wherein the preset vehicle speed error coefficient is a value preset based on actual conditions, and there is no limitation on this. For example, the preset vehicle speed error coefficient may be 0.97.

[0045] Table 1

[0046] A second embodiment of the present invention provides a vehicle diagnostic instrument 100, referring to Fig.10 As shown, the vehicle diagnostic instrument 100 includes at least one processor 10 and a memory 20 that is communicatively connected to the at least one processor 10 .

[0047] The memory 20 stores a computer program that can be executed by at least one processor 10 , and when at least one processor 10 executes the computer program, the vehicle speed flashing method of the above embodiment is implemented.

[0048] The vehicle diagnostic instrument 100 according to the embodiment of the present invention obtains the status parameters of the truck through the on-board OBD interface, and writes the speed adjustment coefficient of the truck into the driving recorder after determining that the status parameters meet the data interaction conditions. On the one hand, the speed displayed on the new human-computer interaction interface of the truck is calibrated to make the displayed speed meet the industry standards; on the other hand, the one-time pass rate of the factory program flashing is improved to meet the requirement of the one-time pass rate of the factory program flashing.

[0049] In some embodiments, the vehicle diagnostic instrument includes an interactive screen, which is used for human-computer interaction to improve the intelligence of use.

[0050] Specifically, through the interactive screen, the inspector can interact with the vehicle diagnostic instrument, for example, directly obtain the status parameters of the truck, or view the vehicle speed calibration results through the interactive screen, etc., without specific restrictions here.

[0051] In the description of this specification, any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code including one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0052] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or otherwise processing in a suitable manner if necessary, and then stored in a computer memory.

[0053] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0054] A person skilled in the art may understand that all or part of the steps in the above-mentioned embodiment method may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0055] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0056] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0058] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A vehicle speed flashing method, characterized in that: For a vehicle diagnostic instrument, the method includes: After confirming the connection with the vehicle-mounted OBD interface, obtain the status parameters of the truck; After the state parameter meets the data exchange condition, the speed adjustment coefficient of the truck is written into the driving recorder.

2. The vehicle speed flashing method according to claim 1, characterized in that: The state parameters include at least a power-on state parameter and a vehicle gear state parameter.

3. The vehicle speed flashing method according to claim 1, characterized in that: The vehicle diagnostic instrument is equipped with a vehicle speed flashing application software, which is used to determine the connection with the vehicle OBD interface, including: Starting the vehicle speed flashing application software; Under the vehicle speed flashing application software, triggering a connection diagnosis instruction; In response to the connection diagnosis instruction, a data read and write command column is displayed, and it is determined that the vehicle is connected to the OBD interface.

4. The vehicle speed flashing method according to claim 3, characterized in that: Before writing the speed adjustment coefficient of the truck into the driving recorder, the method further includes: The start diagnostic session instruction in the data read and write command column is triggered to enter a data write mode.

5. The vehicle speed flashing method according to claim 4, characterized in that: Before entering the data writing mode, the method further includes: In the vehicle speed flashing application software, trigger and display a data flashing channel selection interface; A target data writing channel for writing the speed adjustment coefficient is determined according to the data writing channel selection interface.

6. The vehicle speed flashing method according to claim 5, characterized in that: Writing the speed adjustment coefficient of the truck into the driving recorder includes: When entering the data writing mode, triggering the speed adjustment coefficient writing instruction in the data reading and writing command sequence; In response to the speed adjustment coefficient writing instruction, displaying a speed adjustment coefficient list; Selecting a speed adjustment coefficient corresponding to the truck from the speed adjustment coefficient list; The selected speed adjustment coefficient is written into the driving recorder.

7. The vehicle speed flashing method according to claim 6, characterized in that: The method further comprises: When entering the data writing mode, triggering the vehicle identification number writing instruction in the data reading and writing command column; In response to the vehicle identification number writing instruction, displaying a vehicle identification number list; Selecting a vehicle identification number corresponding to the truck from the vehicle identification number list; The selected vehicle identification number is flashed into the driving recorder.

8. The vehicle speed flashing method according to claim 6, characterized in that: Before displaying the speed adjustment factor list, the method further includes: Obtaining the rear axle speed ratio, tire rolling diameter and gearbox teeth number of the truck; Determining a preset vehicle speed error coefficient; The speed adjustment coefficient is determined according to the rear axle speed ratio, the tire rolling diameter, the number of gearbox teeth and the preset vehicle speed error coefficient.

9. A vehicle diagnostic instrument, characterized in that: include: at least one processor; a memory communicatively coupled to at least one of the processors; Wherein, the memory stores a computer program that can be executed by at least one of the processors, and when at least one of the processors executes the computer program, the vehicle speed flashing method according to any one of claims 1 to 8 is implemented.

10. The vehicle diagnostic instrument according to claim 9, characterized in that: It also includes an interactive screen, which is used for human-computer interaction.

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