Commercial vehicle CAN network fault rapid diagnosis box and fault judgment method

Abstract

The application relates to a commercial vehicle CAN network fault rapid diagnosis box and a fault judgment method. The diagnosis box is internally provided with a CAN-BUS WIFI module; a diagnosis panel is provided with a plurality of groups of gateway terminals and wire harness terminals, the gateway terminals and the wire harness terminals are connected through double banana plugs, one side of the diagnosis box is provided with aviation male plugs A, B and C, one end of the aviation male plug A is connected with the gateway terminal, one end of the aviation male plug B is connected with the wire harness terminal, one end of the aviation male plug C is connected with a 24V direct current terminal and a grounding terminal; the other end of the aviation male plug A is connected with a vehicle gateway interface through a diagnosis wire harness A; the other end of the aviation male plug B is connected with a vehicle wire harness interface through a diagnosis wire harness B; the other end of the aviation male plug C is connected with a power wire harness, the power wire harness is provided with a vehicle cigarette lighter plug, the vehicle cigarette lighter plug is connected with a vehicle cigarette lighter; the application has the advantages of compact structure, convenient carrying and low use threshold.

Description

Technical Field

[0001] This invention relates to the field of commercial vehicle technology, and in particular to a rapid fault diagnosis box and fault diagnosis method for commercial vehicle CAN network. Background Technology

[0002] As the complexity of electronic control systems in commercial vehicles increases, fault diagnosis of CAN networks in commercial vehicles becomes increasingly difficult and time-consuming. However, most of the key and difficult faults encountered in the maintenance channel are closely related to the vehicle's CAN network.

[0003] Currently, the main method for diagnosing CAN network faults in commercial vehicles is to collect messages from faulty vehicles, analyze these messages to obtain vague fault information, and requires specific message analysis software. This places high demands on the professional skills of diagnostic personnel and cannot provide direct diagnostic results regarding the continuity of nodes on each branch of the CAN network. It requires measuring each node with a multimeter, and sometimes it is necessary to disassemble or break the insulation of equipment and wiring harnesses, which takes a lot of time to troubleshoot. Therefore, there is a need for a diagnostic instrument that can quickly and intuitively reflect the status of each branch of the CAN network in commercial vehicles, determine the scope of the fault, and reduce the time spent on troubleshooting. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a rapid fault diagnosis box and fault diagnosis method for commercial vehicle CAN network.

[0005] This invention is achieved using the following technical solution:

[0006] A rapid diagnostic box for CAN network faults in commercial vehicles includes a diagnostic box body, a diagnostic panel, and a CAN-BUS WIFI module inside the diagnostic box.

[0007] The diagnostic panel is equipped with:

[0008] Several sets of terminals, including gateway terminals and wire harness terminals, wherein the gateway terminals and wire harness terminals are connected by a double banana plug, and the gateway terminals and wire harness terminals are arranged vertically to each other.

[0009] Power indicator light, test light, 24V DC terminal, grounding terminal, digital voltage display module, gateway-wire harness terminal voltage measurement selection switch and terminal voltage selection knob;

[0010] The diagnostic box is equipped with aviation male plug A, aviation male plug B and aviation male plug C on one side. One end of aviation male plug A is connected to the gateway terminal through a wire, one end of aviation male plug B is connected to the wire harness terminal through a wire, and one end of aviation male plug C is connected to the 500K-H terminal, 500K-L terminal, 250K-H terminal, 250K-L terminal, 24V DC terminal and ground terminal through a wire.

[0011] The other end of the aviation connector A is connected to the vehicle gateway interface via diagnostic harness A.

[0012] The other end of the aviation male connector B is connected to the vehicle wiring harness interface via the diagnostic wiring harness B.

[0013] The other end of the aviation male connector C is connected to the power harness, which is equipped with a vehicle cigarette lighter connector, and the vehicle cigarette lighter connector is connected to the vehicle cigarette lighter.

[0014] Preferably, both the aviation male plug A and the aviation male plug B are 32-pin aviation plugs;

[0015] The aviation male connector C is a 6-pin aviation connector;

[0016] The terminal voltage selection knob is a circular knob with 32 positions;

[0017] The number of terminals in several groups is 32, namely terminals A-01, A-02, A-03...A-32;

[0018] The test lamp includes a test lamp negative terminal, a test lamp positive terminal, and a main test lamp;

[0019] The diagnostic wiring harness A is provided with a female plug A, which is connected to the vehicle gateway interface;

[0020] The diagnostic wiring harness B is equipped with a female plug B, which is connected to the vehicle wiring harness interface.

[0021] A fault diagnosis method for a commercial vehicle CAN network rapid fault diagnosis box, applied to any of the above-mentioned commercial vehicle CAN network rapid fault diagnosis boxes, includes ground wire diagnosis and judgment, turning the vehicle ignition switch to the ON position, connecting the A-29 group terminals and the negative terminal of the test lamp through the connecting wire, and connecting the positive terminal of the test lamp and the 24V DC terminal through the double banana plug, at which time the main test lamp lights up;

[0022] Turn the vehicle ignition switch to the ON position, disconnect the connection wire from the A-29 group terminals, connect the gateway terminal and the test lamp negative terminal of the A-29 group terminals through the connection wire, and connect the test lamp negative terminal and the ground terminal through the double banana plug. At this time, the main test lamp will light up.

[0023] Connect the wiring harness terminal of terminal A-29 and the negative terminal of the test lamp via the connecting cable. Connect the positive terminal of the test lamp and the 24V DC terminal via the double banana plug. At this time, the main test lamp will light up, and the short circuit and normal status of the grounding wire can be diagnosed and judged.

[0024] Preferably, it also includes power cord diagnostics.

[0025] Turn the vehicle ignition switch to the ON position, connect the A-17 group terminals and the positive terminal of the test lamp through the connecting wire, and connect the negative terminal of the test lamp and the ground terminal through the double banana plug. The main test lamp will light up.

[0026] Turn the vehicle ignition switch to the ON position, disconnect the connection wire from the A-17 group terminals, connect the gateway terminal and the positive terminal of the test lamp to the A-17 group terminals through the connection wire, and connect the negative terminal and the ground terminal of the test lamp through the double banana plug. The main test lamp does not light up.

[0027] Connect the wiring harness terminals of group A-17 and the positive terminal of the test lamp via the connecting cable. Connect the positive terminal of the test lamp and the grounding terminal via the double banana plug. The main test lamp will light up, allowing you to determine whether the power cord is open-circuited, short-circuited, or in normal condition.

[0028] Preferably, it also includes diagnostic judgment of the CAN bus, wherein the CAN bus includes a diagnostic CAN line, a power CAN line, an engine CAN line, an information CAN line, and a chassis CAN line;

[0029] The diagnostic CAN line diagnostic judgment is as follows:

[0030] If the CAN-BUSWIFI module cannot read the corresponding CAN message by connecting the A-01 group terminals and the 500K-H terminal, and the A-02 group terminals and the 500K-L terminal, then a CAN line fault is diagnosed.

[0031] The diagnostic judgment for the power CAN line is as follows:

[0032] By connecting the A-03 group terminals and the 500K-H terminal, and the A-04 group terminals and the 500K-L terminal, the CAN-BUSWIFI module can read the CAN message;

[0033] Disconnect the connection cable from terminals A-03 and A-04. The CAN-BUSWIFI module can read the CAN messages from the gateway and wiring harness, and determine the status of the gateway module and power CAN line.

[0034] The engine CAN line diagnostic judgment is as follows:

[0035] By connecting terminals A-05 and 500K-H, and terminals A-06 and 500K-L, the CAN-BUSWIFI module reads the CAN message and determines the status of the engine CAN line.

[0036] The CAN line diagnostic judgment is as follows:

[0037] Connect the A-07 group terminals and the 500K-H terminal, and the A-08 group terminals and the 500K-L terminal with the connecting cable. If the CAN-BUSWIFI module cannot read the CAN message, perform a status check on the information CAN line.

[0038] The chassis CAN line diagnostic judgment is as follows:

[0039] Connect the A-11 terminal group and the 250K-H terminal, and the A-12 terminal group and the 250K-L terminal with the connecting cable. If the CAN-BUSWIFI module cannot read the CAN message, check the status of the chassis CAN line.

[0040] Compared with the prior art, the present invention has the following beneficial technical effects:

[0041] The invention has a compact structure, is easy to carry, and has a low barrier to entry. The diagnostic box and CAN-BUS WIFI module are powered by connecting to the power harness via an aviation male connector C. The power harness is connected to the car cigarette lighter via a car cigarette lighter plug.

[0042] Aviation male connectors A and B connect to the vehicle gateway interface and the vehicle wiring harness, respectively. The selected terminal voltage can be directly displayed on the digital voltage display module via a 32-bit voltage selection knob and a gateway-wiring harness selection switch. Connect the wires to the measuring terminals and the positive or negative terminal of the test lamp. Diagnose the wiring harness continuity by checking if the main test lamp is lit. The CAN-BUS WIFI module monitors the gateway or vehicle CAN line message transmission status in real time, diagnosing whether the gateway or related controllers are working properly. It can quickly and intuitively reflect the status of each branch line of the vehicle CAN network and the continuity of related wiring harnesses, determine the fault range, and reduce fault diagnosis time. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the structure of the present invention;

[0044] Figure 2 This is a schematic diagram of the structure of the double banana plug in this invention;

[0045] Figure 3 This is a schematic diagram of the connection structure between the power harness and CAN-BUS WIFI in this invention;

[0046] Figure 4This is a schematic diagram of the structure of diagnostic harness A in this invention;

[0047] Figure 5 This is a schematic diagram of the diagnostic harness B in this invention.

[0048] In the diagram: 1. Double banana plug; 2. Gateway terminal; 3. Wiring harness terminal; 4. Power indicator light; 5. 24V DC terminal; 6. Grounding terminal; 7. Test lamp positive terminal; 8. Test lamp negative terminal; 9. Main test lamp; 10. Digital voltage display module; 11. Terminal voltage selection knob; 12. Aviation male plug C; 13. Aviation male plug B; 14. Aviation male plug A; 15. Gateway-wiring harness terminal voltage measurement selection switch; 16. Power wiring harness; 17. Car cigarette lighter plug; 18. Diagnostic wiring harness A; 19. Plug female plug A; 20. 500K-H terminal; 21. 250K-H terminal; 22. 500K-L terminal; 23. 250K-L terminal; 24. Diagnostic wiring harness B; 25. Plug female plug B. Detailed Implementation

[0049] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0050] Example 1

[0051] like Figures 1-5 As shown, a commercial vehicle CAN network fault rapid diagnostic box includes a diagnostic box body, a diagnostic panel, and a CAN-BUS WIFI module inside the diagnostic box.

[0052] The diagnostic panel includes:

[0053] Several sets of terminals, including gateway terminal 2 and wire harness terminal 3, are connected by a double banana plug 1, and the gateway terminal 2 and the wire harness terminal 3 are arranged vertically.

[0054] 4. Power indicator light, test lamp, 5. 24V DC terminal, 6. Grounding terminal, 10. Digital voltage display module, 15. Gateway-wire harness terminal voltage measurement selection switch and 11. Terminal voltage selection knob;

[0055] One side of the diagnostic box is equipped with aviation male connectors A14, B13, and C12. One end of aviation male connector A14 is connected to gateway terminal 2 via a wire. One end of aviation male connector B13 is connected to wire harness terminal 3 via a wire. One end of aviation male connector C12 is connected to 500K-H terminal 20, 500K-L terminal 22, 250K-H terminal 21, 250K-L terminal 23, 24V DC terminal 5, and grounding terminal 6 via a wire.

[0056] Among them, 500K-H terminal 20 is a CAN-H terminal with a baud rate of 500kbps;

[0057] 500K-L terminal 22 is a CAN-L terminal with a baud rate of 500kbps;

[0058] 250K-H terminal 21 is a CAN-H terminal with a baud rate of 250kbps;

[0059] 250K-L terminal 23 is a CAN-L terminal with a baud rate of 250kbps.

[0060] The other end of the aviation connector A14 connects to the vehicle gateway interface via the diagnostic harness A18.

[0061] The other end of the aviation male connector B13 connects to the vehicle wiring harness interface via the diagnostic wiring harness B24.

[0062] The other end of the aviation male connector C12 is connected to the power harness 16, which is equipped with a car cigarette lighter connector 17, which is connected to the car cigarette lighter.

[0063] Both aviation male connector A14 and aviation male connector B13 are 32-pin aviation connectors;

[0064] The C12 aviation male connector is a 6-pin aviation connector;

[0065] Terminal voltage selection knob 11 is a round knob with 32 positions;

[0066] There are several sets of terminals, totaling 32 sets, namely terminals A-01, A-02, A-03...A-32.

[0067] The test lamp includes the test lamp negative terminal 8, the test lamp positive terminal 7, and the main test lamp 9;

[0068] The diagnostic wiring harness A18 is equipped with a female plug A19, which is connected to the vehicle gateway interface.

[0069] The diagnostic wiring harness B24 is equipped with a female plug B25, which connects to the vehicle wiring harness interface.

[0070] Example 2

[0071] A fault diagnosis method for a commercial vehicle CAN network rapid diagnostic box, applicable to any of the above-mentioned commercial vehicle CAN network rapid diagnostic boxes, including ground wire diagnosis, turning the vehicle ignition switch to the ON position, connecting the A-29 group terminals and the test lamp negative terminal 8 through the connecting wire, and connecting the test lamp positive terminal 7 and the 24V DC terminal 5 through the double banana plug 1, at which time the main test lamp 9 lights up;

[0072] Turn the vehicle ignition switch to the ON position, disconnect the connection wire from the A-29 group terminals, connect the gateway terminal and test lamp negative terminal 8 of the A-29 group terminals through the connection wire, and connect the test lamp negative terminal 8 and ground terminal 6 through the double banana plug 1. At this time, the main test lamp 9 will light up.

[0073] Connect the wiring harness terminal of terminal A-29 and the negative terminal 8 of the test lamp via the connecting wire. Connect the positive terminal 7 of the test lamp and the 24V DC terminal 5 via the double banana plug 1. At this time, the main test lamp 9 will light up, and the short circuit and normal status of the grounding wire can be diagnosed and judged.

[0074] It also includes the diagnosis and judgment of the power cord.

[0075] Turn the vehicle ignition switch to the ON position, connect the A-17 group terminals and the test lamp positive terminal 7 through the connecting wire, and connect the test lamp negative terminal 8 and the ground terminal 6 through the double banana plug 1. The main test lamp will light up.

[0076] Turn the vehicle ignition switch to the ON position, disconnect the connection wire from the A-17 group terminals, connect the gateway terminal and test lamp positive terminal 7 of the A-17 group terminals through the connection wire, connect the test lamp negative terminal 8 and ground terminal 6 through the double banana plug 1, and the main test lamp 9 will not light up;

[0077] Connect the wiring harness terminals of group A-17 and the positive terminal 7 of the test lamp via the connecting cable. Connect the positive terminal 7 of the test lamp and the grounding terminal 6 via the double banana plug 1. The main test lamp 9 will light up, allowing you to determine whether the power cord is open-circuited, short-circuited, or in normal condition.

[0078] It also includes diagnostics and judgments for the CAN bus, which includes the diagnostic CAN line, power CAN line, engine CAN line, information CAN line, and chassis CAN line.

[0079] Diagnostic judgment for CAN line is as follows:

[0080] If the CAN-BUSWIFI module cannot read the corresponding CAN message by connecting the A-01 group terminals and 500K-H terminal 20, and the A-02 group terminals and 500K-L terminal 22, then the CAN line fault is diagnosed.

[0081] The diagnostic results for the power CAN bus are as follows:

[0082] By connecting the A-03 group terminals and the 500K-H terminal 20, and the A-04 group terminals and the 500K-L terminal 22, the CAN-BUSWIFI module reads the CAN message;

[0083] Disconnect the connection cable from terminals A-03 and A-04. The CAN-BUSWIFI module can read the CAN messages from the gateway and wiring harness, and determine the status of the gateway module and power CAN line.

[0084] The engine CAN bus diagnostic results are as follows:

[0085] By connecting the A-05 group terminals and the 500K-H terminal 20, and the A-06 group terminals and the 500K-L terminal 22, the CAN-BUSWIFI module reads the CAN message and performs a status check on the engine CAN line.

[0086] The diagnostic results for the CAN bus information line are as follows:

[0087] Connect the A-07 group terminals and the 500K-H terminal 20, and the A-08 group terminals and the 500K-L terminal 22 via the connecting cable. If the CAN-BUSWIFI module cannot read the CAN message, perform a status check on the information CAN line.

[0088] The chassis CAN bus diagnostic results are as follows:

[0089] Connect the A-11 group terminals and the 250K-H terminal 21, and the A-12 group terminals and the 250K-L terminal 23 via the connecting cable. If the CAN-BUSWIFI module cannot read the CAN message, perform a status check on the chassis CAN line.

Claims

1. A rapid fault diagnosis box for commercial vehicle CAN network, characterized in that, Includes a diagnostic box body, the diagnostic box is equipped with a diagnostic panel, and the diagnostic box is equipped with a CAN-BUS WIFI module; The diagnostic panel is equipped with: Several sets of terminals, including gateway terminals (2) and wire harness terminals (3), the gateway terminals (2) and wire harness terminals (3) are connected by a double banana plug (1), and the gateway terminals (2) and the wire harness terminals (3) are arranged vertically; Power indicator light (4), test lamp, 24V DC terminal (5), grounding terminal (6), digital voltage display module (10), gateway-wire harness terminal voltage measurement selection switch (15) and terminal voltage selection knob (11); The diagnostic box is equipped with aviation male connector A (14), aviation male connector B (13) and aviation male connector C (12) on one side. One end of aviation male connector A (14) is connected to the gateway terminal (2) through a wire. One end of aviation male connector B (13) is connected to the wire harness terminal (3) through a wire. One end of aviation male connector C (12) is connected to the 500K-H terminal (20), 500K-L terminal (22), 250K-H terminal (21), 250K-L terminal (23), 24V DC terminal (5) and grounding terminal (6) through a wire. The other end of the aviation male connector A (14) is connected to the vehicle gateway interface via the diagnostic harness A (18); The other end of the aviation male connector B (13) is connected to the vehicle wiring harness interface via the diagnostic wiring harness B (24); The other end of the aviation male connector C (12) is connected to the power harness (16), which is provided with a car cigarette lighter plug (17) and is connected to the car cigarette lighter.

2. The commercial vehicle CAN network fault rapid diagnosis box according to claim 1, characterized in that, Both the aviation male connector A (14) and the aviation male connector B (13) are 32-pin aviation connectors; The aviation male connector C(12) is a 6-pin aviation connector; The terminal voltage selection knob (11) is a circular knob with 32 positions; The number of terminals in several groups is 32, namely terminals A-01, A-02, A-03...A-32; The test lamp includes a negative terminal (8), a positive terminal (7), and a main test lamp (9); The diagnostic wiring harness A (18) is provided with a female plug A (19), which is connected to the vehicle gateway interface; The diagnostic wiring harness B (24) is provided with a female plug B (25) which is connected to the vehicle wiring harness interface.

3. A method for diagnosing faults in a commercial vehicle CAN network rapid diagnostic box, applied to the commercial vehicle CAN network rapid diagnostic box as described in any one of claims 1-2, characterized in that, Including grounding wire diagnosis and judgment, turn the vehicle ignition switch to the ON position, connect the A-29 group terminals and the test lamp negative terminal (8) through the connecting wire, and connect the test lamp positive terminal (7) and 24V DC terminal (5) through the double banana plug (1). At this time, the main test lamp (9) will light up. Turn the vehicle ignition switch to the ON position, disconnect the connection wire from the A-29 group terminal, connect the gateway terminal and the test lamp negative terminal (8) of the A-29 group terminal through the connection wire, and connect the test lamp negative terminal (8) and the ground terminal (6) through the double banana plug (1). At this time, the main test lamp (9) will light up. Connect the wire harness terminal of terminal A-29 and the negative terminal of the test lamp (8) through the connecting wire, and connect the positive terminal (7) of the test lamp and the 24V DC terminal (5) through the double banana plug (1). At this time, the main test lamp (9) will light up, and the short circuit and normal state of the grounding wire will be diagnosed and judged.

4. The fault diagnosis method for the commercial vehicle CAN network rapid fault diagnosis box according to claim 3, characterized in that, It also includes the diagnosis and judgment of the power cord. Turn the vehicle ignition switch to the ON position, connect the A-17 group terminals and the positive terminal (7) of the test lamp through the connecting wire, and connect the negative terminal (8) of the test lamp and the ground terminal (6) through the double banana plug (1). The main test lamp will light up. Turn the vehicle ignition switch to the ON position, disconnect the connection wire from the A-17 group terminal, connect the gateway terminal and the positive terminal (7) of the A-17 group terminal through the connection wire, connect the negative terminal (8) of the test lamp and the ground terminal (6) through the double banana plug (1), and the main test lamp (9) will not light up; Connect the wiring harness terminals of group A-17 and the positive terminal of the test lamp (7) with the connecting wire. Connect the positive terminal of the test lamp (7) and the grounding terminal (6) with the double banana plug (1). The main test lamp (9) will light up to determine the open circuit, short circuit and normal status of the power line.

5. The fault diagnosis method for the commercial vehicle CAN network rapid fault diagnosis box according to claim 3, characterized in that, It also includes diagnostics and judgments for the CAN bus, which includes diagnostic CAN line, power CAN line, engine CAN line, information CAN line, and chassis CAN line; The diagnostic CAN line diagnostic judgment is as follows: If the CAN-BUSWIFI module cannot read the corresponding CAN message by connecting the A-01 group terminals and the 500K-H terminal (20), and the A-02 group terminals and the 500K-L terminal (22), then the CAN line fault is diagnosed. The diagnostic judgment for the power CAN line is as follows: By connecting the A-03 group terminals and the 500K-H terminal (20), and the A-04 group terminals and the 500K-L terminal (22), the CAN-BUSWIFI module reads the CAN message; Disconnect the connection cable from terminals A-03 and A-04. The CAN-BUSWIFI module can read the CAN messages from the gateway and wiring harness, and determine the status of the gateway module and power CAN line. The engine CAN line diagnostic judgment is as follows: By connecting the A-05 group terminal and the 500K-H terminal (20), and the A-06 group terminal and the 500K-L terminal (22), the CAN-BUSWIFI module reads the CAN message and performs a status check on the engine CAN line. The CAN line diagnostic judgment is as follows: Connect the A-07 group terminal and the 500K-H terminal (20) and the A-08 group terminal and the 500K-L terminal (22) with the connecting cable. The CAN-BUSWIFI module cannot read the CAN message and performs a status judgment on the information CAN line. The chassis CAN line diagnostic judgment is as follows: Connect the A-11 group terminals and the 250K-H terminal (21) and the A-12 group terminals and the 250K-L terminal (23) with the connecting cable. The CAN-BUSWIFI module cannot read the CAN message and performs a status check on the chassis CAN line.

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