Wire harness assembly and vehicle speed calibration system

Abstract

The utility model discloses a wire harness assembly and a vehicle speed calibration system, and the wire harness assembly comprises a first plug, one end of the first plug 1 is internally provided with a first accommodation cavity, the first accommodation cavity is internally provided with a plurality of data connection terminals, and the data connection terminals are matched with function terminals of a vehicle-mounted OBD interface on a truck. A first wire harness 6 and a second wire harness 7 are led out from the other end of the first plug; one end of the second plug 2 is connected with the first wire harness 6, and the other end of the second plug 2 is used for being connected with a vehicle diagnostic instrument; one end of the third plug 3 is connected with the second wire harness 7; one end of the third wire harness 8 is provided with a female plug 4, the female plug 4 is detachably connected with the other end of the third plug 3, the other end of the third wire harness 8 is provided with a data interface 5, and the data interface 5 is used for being connected with an automobile data recorder of a truck when the speed adjustment coefficient is flashed. An automobile data recorder, a vehicle-mounted OBD interface and a vehicle diagnostic instrument can be connected through the wiring harness assembly, and vehicle speed calibration on the vehicle speed displayed on a new man-machine interaction interface of a truck is achieved.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to a wiring harness assembly and a vehicle speed calibration system. Background Technology

[0002] Before a truck leaves the factory, its speedometer display needs to be calibrated to ensure it conforms to industry standards. These standards require the displayed speed to be greater than the actual speed. Traditional speedometers can be calibrated by writing data through a program. However, the speed calculation module of the new human-machine interface instrument is integrated into the dashcam, which lacks a CAN bus connection and cannot be programmed via CAN bus. Therefore, a separate communication harness needs to be designed to meet the speed calibration requirements. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this utility model is to provide a wiring harness assembly that connects a truck's driving recorder containing a speed calculation module, the truck's on-board OBD interface, and a vehicle diagnostic tool. This allows the vehicle diagnostic tool to write the truck's speed adjustment coefficient into the driving recorder, enabling speed calibration of the vehicle speed displayed on the truck's new human-machine interface, and improving the first-pass yield rate of the program to meet the factory's program first-pass yield requirements.

[0004] A second aspect of this utility model provides a vehicle speed calibration system.

[0005] To address the aforementioned problems, a first aspect of this utility model provides a wire harness assembly, such as... Figure 1 As shown, it includes: a first plug 1, one end of which has a first receiving cavity, and the first receiving cavity has multiple data connection terminals that match the functional terminals of the truck's on-board OBD interface; the other end of the first plug has a first wiring harness 6 and a second wiring harness 7 leading out; a second plug 2, one end of which is connected to the first wiring harness 6, and the other end of which is used to connect to a vehicle diagnostic tool; a third plug 3, one end of which is connected to the second wiring harness 7; and a third wiring harness 8, one end of which has a female plug 4, which is detachably connected to the other end of the third plug 3; the other end of the third wiring harness 8 has a data interface 5, which is used to connect to the truck's driving recorder when writing the speed adjustment coefficient.

[0006] According to the wiring harness assembly of this utility model embodiment, when writing the speed adjustment coefficient, the vehicle diagnostic tool can connect to the truck's driving recorder and the truck's on-board OBD interface through the wiring harness assembly. The vehicle diagnostic tool can then obtain the truck's status parameters through the on-board OBD interface. After confirming that the status parameters meet the data interaction conditions, the vehicle diagnostic tool writes the truck's speed adjustment coefficient into the driving recorder. This achieves two goals: firstly, it calibrates the vehicle speed displayed on the truck's new human-machine interface, ensuring the displayed speed conforms to industry standards; secondly, it improves the first-pass yield of the factory program, meeting the requirements for first-pass yield of factory program writing.

[0007] In some embodiments, such as Figure 1 The other end of the second plug 2 is provided with a second receiving cavity, and the second receiving cavity is provided with a plurality of functional pins, which are matched with the functional terminals of the on-board OBD interface on the truck.

[0008] In some embodiments, the plurality of data connection terminals include at least a data transmission terminal for transmitting the speed adjustment coefficient, and the plurality of functional pins include at least a data transmission pin for transmitting the speed adjustment coefficient; the data interface includes a data transmission interface for transmitting the speed adjustment coefficient, a power supply interface, a grounding interface, and a spare interface.

[0009] In some embodiments, the outer casing of the data interface is square in shape.

[0010] In some embodiments, the outer housing of the data interface includes a rectangular portion and a semicircular portion, wherein the rectangular portion is connected to the semicircular portion.

[0011] A second aspect of this utility model provides a vehicle speed calibration system, comprising: a wiring harness assembly as described in the above embodiment, wherein the data interface of the wiring harness assembly is used to connect to a truck's driving recorder when writing speed adjustment coefficients, and a first plug of the wiring harness assembly is used to connect to the truck's on-board OBD interface when writing speed adjustment coefficients; and a vehicle diagnostic instrument, wherein the vehicle diagnostic instrument includes a diagnostic interface, and the diagnostic interface is used to connect to a second plug of the wiring harness assembly when writing speed adjustment coefficients.

[0012] According to the vehicle speed calibration system of this utility model embodiment, the truck's driving recorder and the truck's on-board OBD interface are connected through a wiring harness assembly. Thus, the vehicle diagnostic instrument can obtain the truck's status parameters through the on-board OBD interface, and after determining that the status parameters meet the data interaction conditions, it writes the truck's speed adjustment coefficient into the driving recorder. On the one hand, this realizes the vehicle speed calibration of the speed displayed on the truck's new human-machine interface, so that the displayed speed conforms to industry standards; on the other hand, it improves the first-pass yield of the factory program, so as to meet the requirements of the first-pass yield of the factory program.

[0013] In some embodiments, the vehicle OBD interface includes sixteen functional terminals arranged in a two-row, eight-column matrix, wherein, along the first direction, the two functional terminals in the sixth column are diagnostic data transmission terminals; the diagnostic interface includes sixteen connection terminals arranged in a two-row, eight-column matrix, wherein, along the first direction, the two connection terminals in the first column are data transmission terminals; the vehicle speed calibration system further includes an adapter, the adapter including a first connector 11 and a second connector 12, the first connector 11 being connected to the vehicle OBD interface, and the second connector 12 being connected to the first plug 1, the first connector 11 including sixteen first wiring terminals, and the second connector 12 including sixteen second wiring terminals, the sixteen first wiring terminals being arranged in a two-row, eight-column matrix, and the sixteen second wiring terminals being arranged in a two-row, eight-column matrix, wherein, along the first direction, the second wiring terminals in the sixth column are electrically connected to the first wiring terminals in the first column.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0016] Figure 1 This is a schematic diagram of a wire harness assembly according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of a wire harness assembly according to another embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the housing of a data interface according to an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the housing of a data interface according to an embodiment of the present invention;

[0020] Figure 5 This is a block diagram of a vehicle speed calibration system according to an embodiment of the present invention;

[0021] Figure 6 This is a schematic diagram of the terminal arrangement according to an embodiment of the present invention;

[0022] Figure 7 This is a schematic diagram of an adapter according to an embodiment of the present invention;

[0023] Figure 8 This is a schematic diagram of an adapter according to another embodiment of the present invention;

[0024] Figure 9 This is a flowchart of a vehicle speed calibration method according to an embodiment of the present invention.

[0025] Figure label:

[0026] Vehicle speed calibration system 100;

[0027] Wiring harness assembly 10; vehicle diagnostic tool 20.

[0028] First plug 1; Second plug 2; Third plug 3; Female plug 4; Data interface 5; First wiring harness 6; Second wiring harness 7; Third wiring harness 8; Adapter 9; First connector 11; Second connector 12. Detailed Implementation

[0029] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0030] The following is for reference. Figure 1 and Figure 2 The wire harness assembly 10 according to an embodiment of the present invention includes a first plug 1, a second plug 2, a third plug 3 and a third wire harness 8.

[0031] The first plug 1 has a first receiving cavity at one end, which contains multiple data connection terminals that match the functional terminals of the truck's onboard OBD interface. The other end of the first plug 1 has a first wiring harness 6 and a second wiring harness 7. One end of the second plug 2 is connected to the first wiring harness 6, and the other end of the second plug 2 is used to connect to a vehicle diagnostic tool. One end of the third plug 3 is connected to the second wiring harness 7. One end of the third wiring harness 8 has a female plug 4, which is detachably connected to the other end of the third plug 3. The other end of the third wiring harness 8 has a data interface 5, which is used to connect to the truck's driving recorder when writing the speed adjustment coefficient.

[0032] Specifically, multiple data connection terminals within the first receiving cavity at one end of the first plug 1 are connected to the corresponding functional terminals of the truck's onboard OBD interface. That is, the first plug 1 is inserted into the onboard OBD interface, and the other end of the second plug 2 is connected to the vehicle diagnostic tool 20. This connects the first wiring harness 6 to the vehicle diagnostic tool 20 and the onboard OBD interface, allowing the vehicle diagnostic tool 20 to obtain the truck's status parameters through the onboard OBD interface. The third plug 3 is connected to the female plug 4, and the data interface 5 is connected to the driving recorder. This connects the second wiring harness 7 and the third wiring harness 8 to the vehicle diagnostic tool 20 and the driving recorder, enabling vehicle diagnostics... The device can determine whether the vehicle status parameters meet the data interaction conditions. If the data interaction conditions are met, it means that the dashcam is in a state where data can be written. Conversely, if the data interaction conditions are not met, it means that the dashcam is in a state where data cannot be written. Then, after the data interaction conditions are met, the truck's speed adjustment coefficient is written into the dashcam to avoid failure when writing the program, thereby improving the first-time write success rate of the program to meet the factory's first-time write success rate requirements. It also enables the calibration of the vehicle speed displayed on the new truck's human-machine interface, so that the truck's displayed speed conforms to industry standards.

[0033] The truck status parameters may include information such as engine speed, vehicle gear position, vehicle speed, and power-on status parameters, without specific limitations. Data interaction conditions are pre-set vehicle status conditions that allow data exchange between the vehicle diagnostic tool and the dashcam. For example, the data interaction conditions could be that the vehicle is in park, the vehicle speed is 0, and the power-on status parameter is "vehicle powered on." Alternatively, other data interaction conditions can be set based on actual conditions, provided that the speed adjustment coefficient can be correctly written and it is safe; there are no restrictions on this.

[0034] The detachable connection between the female plug 4 and the third plug 3 facilitates user removal and replacement of damaged wiring harnesses. Both the female plug 4 and the third plug 3 contain multiple terminals, the arrangement of which can be found in [reference needed]. Figure 6 As shown, terminal 6 is the CANH terminal, terminal 14 is the CANL terminal, terminals 4 and 5 are ground terminals, and terminal 16 is the power supply terminal. The speed adjustment coefficient for the flashing process is transmitted through terminal 14. When the female connector 4 and the third connector 3 are connected, each terminal is configured according to... Figure 5 The labels shown correspond one-to-one with the connections: terminal 1 of female plug 4 connects to terminal 1 of third plug 3, terminal 2 of female plug 4 connects to terminal 2 of third plug 3, and so on, to complete the connection between the two. Furthermore, the terminal distribution of first plug 1 and second plug 2 can also be referenced. Figure 6The settings are as shown, and there are no restrictions on them. When the first plug 1 and the second plug 2 are connected, each terminal is also configured as follows: Figure 6 The numbers shown correspond one-to-one. Based on the terminal distribution of each plug, when writing data, the speed adjustment coefficient of writing is synchronized to the driving recorder through terminal 14 of the second plug 2, terminal 14 of the third plug 3, terminal 14 of the female plug 4 and data interface 5, so as to realize the vehicle speed calibration of the vehicle speed displayed on the new human-machine interface of the truck.

[0035] According to the wiring harness assembly 10 of this utility model embodiment, when writing the speed adjustment coefficient, the vehicle diagnostic tool can connect to the truck's driving recorder and the truck's on-board OBD interface through the wiring harness assembly. Thus, the vehicle diagnostic tool can obtain the truck's status parameters through the on-board OBD interface, and after determining that the status parameters meet the data interaction conditions, write the truck's speed adjustment coefficient into the driving recorder. On the one hand, this realizes the speed calibration of the vehicle speed displayed on the new human-machine interface of the truck, so that the displayed speed conforms to industry standards; on the other hand, it improves the first-pass yield of factory program writing, so as to meet the requirements of the first-pass yield of factory program writing.

[0036] In some embodiments, a second receiving cavity is provided at the other end of the second plug 2, and a plurality of functional pins are provided in the second receiving cavity, the functional pins being matched with the functional terminals of the on-board OBD interface on the truck.

[0037] Specifically, a second receiving cavity is provided at the other end of the second plug 2. Multiple functional pins within this cavity match the functional terminals of the truck's onboard OBD interface. This allows the vehicle diagnostic tool to connect to the OBD interface via the second plug 2. The vehicle diagnostic tool connects to the onboard OBD interface via the first wiring harness, enabling it to obtain the truck's status parameters. In some embodiments, the multiple data connection terminals include at least a data transmission terminal for transmitting speed adjustment coefficients, and the multiple functional pins include at least a data transmission pin for transmitting speed adjustment coefficients. The data interface 5 includes a data transmission interface for transmitting speed adjustment coefficients, a power supply interface, a grounding interface, and a spare interface.

[0038] Specifically, the vehicle diagnostic tool connects to the on-board OBD interface via wiring harness assembly 10 and to the driving recorder via a data interface, using multiple functional pins and terminals. This allows the vehicle diagnostic tool to acquire the truck's status parameters through the on-board OBD interface and, after confirming that the status parameters meet the data interaction conditions, write the truck's speed adjustment coefficient into the driving recorder. For example... Figure 3 As shown in Figure 4, the data transmission interface of data interface 5 is used for the transmission speed adjustment coefficient, and a spare interface is provided for expanding other functions or for use in case of failure of other interfaces.

[0039] In some embodiments, reference Figure 3 As shown, the outer casing of data interface 5 is square in shape.

[0040] In some embodiments, reference Figure 4 As shown, the outer shell of the data interface 5 includes a rectangular part and a semi-circular part, and the rectangular part and the semi-circular part are connected.

[0041] A second aspect of this utility model provides a vehicle speed calibration system 100, as shown in Figure 5, which includes a wiring harness assembly 10 and a vehicle diagnostic instrument 20.

[0042] The wiring harness assembly 10 has a data interface for connecting the truck's dashcam when writing the speed adjustment coefficient, and a first plug 1 for connecting the truck's on-board OBD interface when writing the speed adjustment coefficient. The vehicle diagnostic tool 20 includes a diagnostic interface for connecting to the second plug 2 of the wiring harness assembly when writing the speed adjustment coefficient.

[0043] Specifically, the first connector 1 is connected to the vehicle's OBD interface, the data interface 5 is connected to the driving recorder, and the second connector 2 is connected to the diagnostic interface of the vehicle diagnostic tool 20. This completes the connection between the vehicle diagnostic tool 20, the vehicle's OBD interface, and the driving recorder. The vehicle status parameters are then obtained through the vehicle's OBD interface, and it is determined whether the vehicle status parameters meet the data interaction conditions. If the data interaction conditions are met, the truck's speed adjustment coefficient is written into the driving recorder to avoid failure during the program writing process. This improves the first-time program writing success rate to meet the factory's first-time program writing success rate requirements. It also enables the calibration of the vehicle speed displayed on the new truck's human-machine interface, ensuring that the truck's displayed speed conforms to industry standards.

[0044] According to the vehicle speed calibration system 100 of this utility model embodiment, when writing the speed adjustment coefficient, the vehicle diagnostic instrument 20 can connect to the truck's driving recorder and the truck's on-board OBD interface through the wiring harness assembly 10. Thus, the vehicle diagnostic instrument 20 can obtain the truck's status parameters through the on-board OBD interface, and after determining that the status parameters meet the data interaction conditions, write the truck's speed adjustment coefficient into the driving recorder. On the one hand, this realizes the vehicle speed calibration of the speed displayed on the new human-machine interface of the truck, so that the displayed speed conforms to industry standards; on the other hand, it improves the first-pass yield of factory program writing, so as to meet the requirements of the first-pass yield of factory program writing.

[0045] In some embodiments, the vehicle OBD interface includes sixteen functional terminals arranged in a two-row, eight-column matrix. Along the first direction, the two functional terminals in the sixth column are diagnostic data transmission terminals. The specific distribution of these functional terminals can be found in [reference needed]. Figure 6 As shown.

[0046] For example, such as Figure 2 and Figure 6 As shown, terminals 4 and 5 of the vehicle OBD interface are connected to the KL31 grounding line via the second plug 2. Terminal 6 is connected to the CAN-H line for transmitting CAN bus high-level signals. Terminal 14 is connected to the CAN-L line for transmitting CAN bus low-level signals and is also compatible with transmitting KWP2000 signals. Terminal 16 is connected to the KL30 constant power supply line.

[0047] The vehicle diagnostic tool 20 includes a diagnostic interface with sixteen connection terminals arranged in a two-row, eight-column matrix. Along the first direction, the two connection terminals in the first column are data transmission terminals.

[0048] The vehicle speed calibration system also includes adapters, such as Figure 7 As shown, the adapter 9 includes a first connector 11 and a second connector 12. The first connector 11 is matched with the truck's on-board OBD interface and has the same pin structure. The second connector 12 is matched with the first plug 1 and has the same pin structure. The first connector 11 includes sixteen first terminals and the second connector 12 includes sixteen second terminals. The sixteen first terminals are arranged in a matrix of two rows and eight columns, and the sixteen second terminals are arranged in a matrix of two rows and eight columns. In the first direction, the second terminals in the sixth column are electrically connected to the first terminals in the first column.

[0049] Specifically, due to differences in truck models, the functions corresponding to the functional terminals of the on-board OBD interface will also change if the truck model changes. H6A and H6B are two models designed with reference to different protocols. For example, the H6A model typically uses... Figure 6 Terminal 9 in the system enables data transmission between the vehicle and the diagnostic tool, such as vehicle status and engine speed. For the H6B model, it typically uses... Figure 6 Communication is via terminal 14. Therefore, when using a wiring harness assembly to rewrite the speed adjustment coefficient for the H6B model, an adapter is required. For example, according to... Figure 6As shown in the terminal numbers, if the functions of each terminal on the vehicle OBD interface and the diagnostic interface are completely identical, data writing can be achieved by matching the wiring harness assembly 10, vehicle diagnostic tool 20, vehicle OBD interface, and dashcam, without the need for an adapter. Conversely, if the functions of each terminal on the vehicle OBD interface and the diagnostic interface are inconsistent—that is, if the vehicle OBD interface uses the two functional terminals in the sixth column as diagnostic data transmission terminals, while the vehicle diagnostic tool 20 uses the two connection terminals in the first column as data transmission terminals—then data writing requires matching the wiring harness assembly 10, adapter 9, vehicle diagnostic tool 20, vehicle OBD interface, and dashcam. Specifically, in the diagnostic interface, refer to... Figure 7 As shown, terminal 6 of the first terminal block 12 (first row, sixth column) is electrically connected to terminal 1 of the first terminal block 11 (first row, first column) via a wire. Similarly, terminal 14 of the second terminal block 12 (second row, sixth column) is connected to terminal 9 of the first terminal block 11 (second row, first column) via a wire. Apart from the terminals already connected, the remaining terminals in the first terminal block 11 and the remaining terminals in the second terminal block 12 are connected one-to-one via wires according to their serial numbers. Based on this design, for cases where the functions of the functional terminals of the vehicle OBD interface and each terminal of the first plug 1 are inconsistent, for example, refer to... Figure 7 , Figure 8As shown, terminal 6 of the second connector 12 is connected to terminal 1 of the first connector 11 via CAN-H for transmitting high-level CAN bus signals; terminal 14 of the second connector 12 is connected to terminal 9 of the first connector 11 via CAN-L for transmitting low-level CAN bus signals; terminals 4 and 5 of the first connector 11 are connected to terminals 4 and 5 of the second connector 12 via KL31 grounding lines; and terminals 16 of the first connector 11 and the second connector 12 are connected via KL30 constant power supply lines. In practical applications, the first plug 1 needs to be connected to the diagnostic interface of the vehicle diagnostic tool 20 via an adapter. Specifically, the first plug 1 is plugged into the second connector 12, and the first connector 11 is plugged into the vehicle's OBD interface. This completes the connection between the vehicle's OBD interface, the adapter 9, and the vehicle diagnostic tool 20. This allows the vehicle diagnostic tool 20 to obtain the truck's status parameters through the vehicle's OBD interface, transmitting the data sequentially through terminal 9 (CANL) of the first connector, terminal 14 of the second connector 12, and terminal 14 of the first plug. Therefore, for vehicles where the functional terminals of the vehicle's OBD interface are fully compatible with the wiring harness assembly 10, data can be directly written using the wiring harness assembly 10. Conversely, for vehicles where the functional terminals of the vehicle's OBD interface are not fully compatible with the wiring harness assembly 10, an adapter can be used to work with the wiring harness assembly 10 to achieve data writing. Thus, the wiring harness assembly 10 is applicable to any vehicle model, improving its versatility.

[0050] The following section explains the method for vehicle speed calibration using a vehicle diagnostic tool, based on the aforementioned tool. (Refer to...) Figure 9 As shown, the method includes at least steps S1-S2.

[0051] Step S1: After confirming the connection with the wiring harness assembly, obtain the truck's status parameters.

[0052] Specifically, after the vehicle diagnostic tool 20 is connected to the wiring harness assembly 10, the vehicle diagnostic tool 20 can connect to the truck's driving recorder and the truck's on-board OBD interface through the wiring harness assembly 10. Therefore, the vehicle diagnostic tool 20 can obtain the truck's status parameters through the on-board OBD interface. The truck's status parameters may include information such as engine speed, vehicle gear status, vehicle speed, and power-on status parameters, etc., without specific limitations here.

[0053] Step S2: After the status parameters meet the data interaction conditions, the truck's speed adjustment coefficient is written into the driving recorder.

[0054] Specifically, confirming that the status parameters meet the data interaction conditions indicates a high success rate in flashing the program to the dashcam, thus avoiding failures during program flashing, improving the first-time flashing success rate to meet the factory's first-time flashing success rate requirements, and flashing the truck's speed adjustment coefficient into the dashcam after the status parameters meet the data interaction conditions, thereby calibrating the vehicle speed displayed on the truck's new human-machine interface to ensure that the truck's displayed speed conforms to industry standards.

[0055] In some embodiments, the status parameters include at least power-on status parameters and vehicle gear status parameters.

[0056] Specifically, the stability of the truck's power supply is determined by the power-on status parameters to avoid writing failure due to power failure when writing the truck's speed adjustment coefficient to the dashcam. The vehicle's driving status is determined by the vehicle's gear status parameters to avoid writing the truck's speed adjustment coefficient to the dashcam while the vehicle is in motion, which could lead to danger.

[0057] In some embodiments, before writing the truck's speed adjustment coefficient into the dashcam, the method further includes receiving a user-provided command to start a diagnostic session and entering a data writing mode.

[0058] Specifically, the truck's speed adjustment coefficient can only be written to the dashcam in data writing mode, thus avoiding data writing without user permission, which would cause the writing process to fail.

[0059] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0060] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A wire harness assembly, characterized in that, include: The first plug has a first receiving cavity at one end, and multiple data connection terminals are provided in the first receiving cavity, which are matched with the functional terminals of the on-board OBD interface on the truck. The other end of the first plug has a first wire harness and a second wire harness. The second plug has one end connected to the first wiring harness and the other end used to connect to the vehicle diagnostic tool. A third plug, one end of which is connected to the second wire harness; The third wiring harness has a female plug at one end, which is detachably connected to the other end of the third wiring harness. The other end of the third wiring harness has a data interface, which is used to connect to the truck's dashcam when writing the speed adjustment coefficient.

2. The wire harness assembly according to claim 1, characterized in that, The other end of the second plug is provided with a second receiving cavity, and the second receiving cavity is provided with a plurality of functional pins, which are matched with the functional terminals of the on-board OBD interface on the truck.

3. The wire harness assembly according to claim 2, characterized in that, The plurality of data connection terminals include at least a data transmission terminal for transmitting the speed adjustment coefficient, and the plurality of functional pins include at least a data transmission pin for transmitting the speed adjustment coefficient; The data interface includes a data transmission interface for transmitting the speed adjustment coefficient, a power supply interface, a grounding interface, and a backup interface.

4. The wire harness assembly according to any one of claims 1-3, characterized in that, The outer casing of the data interface is square in shape.

5. The wire harness assembly according to any one of claims 1-3, characterized in that, The outer casing of the data interface includes a rectangular portion and a semicircular portion, and the rectangular portion is connected to the semicircular portion.

6. A vehicle speed calibration system, characterized in that, include: The wiring harness assembly according to any one of claims 1-5, wherein the data interface of the wiring harness assembly is used to connect to the truck's driving recorder when writing the speed adjustment coefficient, and the first plug of the wiring harness assembly is used to connect to the truck's on-board OBD interface when writing the speed adjustment coefficient. A vehicle diagnostic tool, the vehicle diagnostic tool including a diagnostic interface for connecting to a second plug of the wiring harness assembly when writing the speed adjustment factor.

7. The vehicle speed calibration system according to claim 6, characterized in that, The vehicle-mounted OBD interface includes sixteen functional terminals, which are arranged in a matrix of two rows and eight columns. Among them, along the first direction, the two functional terminals in the sixth column are diagnostic data transmission terminals. The diagnostic interface includes sixteen connection terminals arranged in a two-row, eight-column matrix. Along the first direction, the two connection terminals in the first column are data transmission terminals. The vehicle speed calibration system also includes an adapter, which includes a first connector and a second connector. The first connector is matched with the vehicle OBD interface. The first connector includes sixteen first terminals. The second connector is connected to a first plug. The second connector includes sixteen second terminals. The sixteen first terminals are arranged in a matrix of two rows and eight columns. The sixteen second terminals are arranged in a matrix of two rows and eight columns. Along the first direction, the second terminals in the sixth column are electrically connected to the first terminals in the first column.

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