CN114265387A - Vehicle-mounted fault diagnosis system - Google Patents
Vehicle-mounted fault diagnosis system Download PDFInfo
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- CN114265387A CN114265387A CN202111545249.7A CN202111545249A CN114265387A CN 114265387 A CN114265387 A CN 114265387A CN 202111545249 A CN202111545249 A CN 202111545249A CN 114265387 A CN114265387 A CN 114265387A
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Abstract
The invention belongs to the technical field of vehicle-mounted fault diagnosis, and particularly relates to a vehicle-mounted fault diagnosis system, wherein OBD interfaces are used for being in communication connection with an upper computer or a decoder, the OBD interfaces are divided into two groups, one group is a main control interface, the other group is an auxiliary control interface, the OBD interfaces are connected in parallel through CAN lines and are used for vehicle joint debugging, communication, diagnosis and debugging of a multi-controller, and the communication, diagnosis and debugging efficiency of a sample vehicle (test vehicle) is accelerated.
Description
Technical Field
The invention belongs to the technical field of vehicle-mounted fault diagnosis, and particularly relates to a vehicle-mounted fault diagnosis system.
Background
With increasing degrees of economic globalization and automobile internationalization, the OBDII system will be widely implemented and applied as a driving and emission diagnosis basis. With the continuous development and popularization of the engine electric control technology and the rise of the internet of vehicles, the OBD fault diagnosis is more and more important. OBD full name: an On Board Diagnostics vehicle mounted automatic diagnostic system; OBD II is an abbreviation for On Board Diagnostics II, a type II On-Board diagnostic system. In order to standardize the diagnosis of vehicle emissions and driveability related faults, since 1996, foreign countries must have similar diagnostic instruments, fault coding and repair procedures, i.e. compliance with obdii regulations.
Aiming at the common traditional automobile type, the automobile OBD interface is mainly an interface of an upper computer or a decoder connected with an ECU (electronic control unit) running computer of the automobile, and whether the automobile has fault codes and fault records or not can be checked after the upper computer or the decoder is connected. However, the existing conventional automobile OBD interface is used for debugging, diagnosis and low efficiency of the whole automobile communication.
Disclosure of Invention
In view of the above, the present invention is directed to a vehicle-mounted fault diagnosis system, so as to solve the technical problem that the existing vehicle OBD interface is used for debugging, diagnosing and the efficiency of vehicle-mounted communication is too low, and achieve efficient debugging, diagnosing and vehicle-mounted communication.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the embodiment of the invention provides a vehicle-mounted fault diagnosis system which at least comprises two groups of OBD interfaces connected in parallel, wherein the OBD interfaces are used for being in communication connection with an upper computer or a decoder.
Preferably, the OBD interfaces are divided into two groups, one group is a main control interface, the other group is an auxiliary control interface, and the two groups are connected in parallel through a CAN line.
Preferably, the CAN lines comprise twisted-pair data lines, and the twisted-pair data lines comprise two DCAN diagnosis lines, two battery pack diagnosis CAN lines, two grounding lines, a power line, two ISG generator controller CAN debugging lines, two four-in-one CAN debugging lines, two power PCAN communication lines and two entertainment system ECAN communication lines.
Preferably, the CAN line is a line and further comprises an ABS diagnosis CAN line;
the ABS diagnosis CAN line is a single data line.
Preferably, the system is used for vehicle-mounted fault diagnosis of the test vehicle.
Preferably, the baud rate of the PCAN communication line is 250kbps, the baud rate of the CAN line diagnosed by the battery pack is 250kbps, the baud rate of the ECAN line communication line of the entertainment system is 500kbps, the baud rate of the four-in-one debugging CAN line is 250kbps, and the baud rate of the DCAN diagnosis line is 250 kbps.
Preferably, the DCAN diagnostic line of the main control interface is used for diagnosing the whole vehicle, and the DCAN diagnostic line of the auxiliary control interface is used for diagnosing the ECU.
The prior art only has a set of OBD interface, and this implementation provides a vehicle-mounted fault diagnosis system includes two sets of parallelly connected OBD interfaces, and the OBD interface is used for with host computer or decoder communication connection, the OBD interface is two sets of, and a set of master control interface that is, another a set of is the auxiliary control interface, and, parallelly connected together through the CAN line for the efficiency of communication, diagnosis, the debugging of whole car antithetical couplet accent, many square controllers communication, diagnosis, the sample car (test car) with higher speed.
Drawings
Fig. 1 is a schematic diagram of an OBD interface according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an OBD interface main control portion according to an embodiment of the present invention;
the system comprises a main control interface 1, an auxiliary control interface 2, a CAN Line 3, a ground Line 4, a K-Line 5, a K-Line 6 and a power Line.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings, which illustrate some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic diagram of an OBD interface according to an embodiment of the present invention, where there are two groups of OBD interfaces, each of the two groups of OBD interfaces includes a main control interface 1 and an auxiliary control interface 2, and each of the two groups of OBD interfaces includes a CAN Line 3, a ground Line 4, a K-Line 5, and a power Line 6; as shown in fig. 1, in the present embodiment, the main control interface and the auxiliary control interface are identical, and each include 16 pins, present a trapezoidal shape, and have a structure common to conventional vehicles, and both include an OBD plug and a wire harness; the main control part is connected with a whole vehicle wiring harness of the range extender vehicle; the wire harness of the auxiliary control part is connected in parallel on the main control part, and the wire harness of the whole vehicle is not in direct contact; the connecting structure of the main control part and the auxiliary control part mainly comprises five parts, namely an OBD interface, a power Line, a twisted pair CAN Line, a grounding Line and a K-Line.
Further, the 16 stitches of the main control part mainly comprise 2 DCAN diagnosis lines, 2 battery pack diagnosis CAN lines and 1 ABS diagnosis CAN line, 2 grounding lines, 1 power line, 2 ISG generator controller CAN debugging lines, 2 four-in-one CAN debugging lines, 2 power PCAN communication lines and 2 entertainment system ECAN communication lines; on the other hand, the auxiliary control part 16 pins mainly comprise 2 ECU diagnosis CAN lines, 2 DCAN diagnosis lines, 1 ABS diagnosis CAN line, 2 grounding lines, 1 power line, 2 ISG generator controller CAN debugging lines, 2 four-in-one CAN debugging lines, 2 power PCAN communication lines and 2 entertainment system ECAN communication lines.
In the above embodiment, the system mainly comprises two parts of diagnostic OBD interfaces, one of which is a main control interface, and is used as a main interface for communication, diagnosis and debugging, and comprises a ground wire, a power wire, an ISG generator controller CAN debugging wire, a four-in-one CAN debugging wire, a power PCAN communication wire, an entertainment system ECAN communication wire, a DCAN diagnosis wire, a battery pack diagnosis CAN wire and an ABS diagnosis CAN wire, and is mainly used for communication, diagnosis and debugging of the main control part; the other part is an auxiliary control interface which comprises a grounding wire, a power wire, an ISG generator controller CAN debugging wire, a four-in-one CAN debugging wire, a power PCAN communication wire, an entertainment system ECAN communication wire, a DCAN diagnosis wire, an ECU diagnosis CAN wire and an ABS diagnosis CAN wire, and is mainly used for standby communication, diagnosis and debugging of the CAN wires and efficient cooperation when a plurality of suppliers carry out combined debugging of pre-research project sample vehicles, so that the debugging work is more convenient. The main control structure and the auxiliary control structure accelerate debugging work together, improve joint debugging efficiency and save joint debugging time.
In the present embodiment, in the main control part, where 1 and 9 are PCAN (custom), which is a communication line composed of ABS, low speed voice alarm, ECU (engine controller), VCU, MP5, EAS, IC, ECC, urea quality sensor, NO1 sensor, particle sensor, BCM, NBS and DCU, and the PCAN is formed by CAN _ H (1) twisted with CAN _ L (9), EMC electromagnetic interference signal communication is prevented by the twisted pair CAN line; the baud rate of the PCAN line is 250 kbps;
in the embodiment, the main control part, 2 and 10, are the battery pack diagnosis CAN lines, and mainly perform fault diagnosis on the battery pack; wherein 2 is CAN _ H, 10 is CAN _ L, and 2 and 10 are also twisted-pair, and EMC electromagnetic interference signal communication is prevented by twisting CAN wires; the baud rate of the battery pack diagnostic CAN line is 250 kbps;
in this embodiment, the main control part, 3 and 11 are ECAN lines (self-defined) of the entire entertainment system, and are signal communication lines composed of VCU, ISG _ MCU, four-in-one controller (including four parts of DCDC, DCAC, PDU and TM _ MCU) and BMS, and the PCAN is formed by CAN _ H (3) and CAN _ L (11) in a twisted pair, and EMC electromagnetic interference signal communication is prevented by the twisted pair CAN lines; ECAN has a baud rate of 500 kbps;
in this embodiment, in the main control part, 4 and 5 are ground wires, 4 is a ground wire of the entire vehicle, and 5 is a signal ground wire; 16 is a low-voltage power supply (12V) of the whole vehicle;
in this embodiment, the main control part, wherein 12 and 13 are four-in-one debugging CAN lines (custom), which are signal debugging CAN lines composed of four parts of DCDC, DCAC, PDU and TM _ MCU included in a four-in-one controller, and the four-in-one debugging CAN lines are formed by two-twisted pairs of CAN _ H (12) and CAN _ L (13), and EMC electromagnetic interference signal communication is prevented by the two-twisted pairs of CAN lines; the baud rate of the four-in-one debugging CAN line is 250 kbps;
in this embodiment, the main control part, in which 6 and 14 are DCAN diagnostic CAN (custom), is a CAN line for diagnosis given to the entire vehicle, and the diagnostic CAN line is formed by twisted-pair CAN _ H (6) and CAN _ L (14), and EMC electromagnetic interference signal communication is prevented by the twisted-pair CAN line; diagnosing a baud rate of 250kbps for the DCAN line;
in the embodiment, the main control part, wherein 7 and 15 are ISG electronic control debugging CAN (user-defined), and mainly plays a software debugging role for an ISG electronic control unit; wherein 7 is CAN _ H, 15 is CAN _ L, and 7 and 15 also adopt twisted pair, prevent EMC electromagnetic interference signal communication through the twisted pair CAN line; the baud rate of an ISG electric control debugging CAN line is 250 kbps;
in the embodiment, the main control part 8 is an ABS diagnosis K-Line and mainly plays a role in fault diagnosis for an ABS module; the ABS diagnosis K-Line adopts a single data Line, and can realize online data stream communication, fault code operation and element dynamic test.
In the present embodiment, the sub-control portion, in which 6 and 14 are ECU diagnosis CAN (custom), is formed by a CAN line that diagnoses the ECU, and the diagnosis CAN line is formed by CAN _ H (6) twisted with CAN _ L (14), and prevents communication of EMC electromagnetic interference signals by the twisted pair CAN line; the Baud rate of the CAN line diagnosed by the ECU is 250 kbps;
in the above embodiment, the definitions of other pins (except 6 and 14) of the auxiliary control part are consistent with those of the main control part, and the other pins of the auxiliary control part play a standby role and can be used together when multiple parties need joint debugging, so that the debugging efficiency of the range-extending sample car is greatly improved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (7)
1. The vehicle-mounted fault diagnosis system is characterized by at least comprising two groups of OBD interfaces connected in parallel, wherein the OBD interfaces are used for being in communication connection with an upper computer or a decoder.
2. The vehicle-mounted fault diagnosis system according to claim 1, wherein the OBD interfaces are two groups, one group is a main control interface, the other group is an auxiliary control interface, and the two groups are connected in parallel through CAN lines.
3. The vehicle-mounted fault diagnosis system according to claim 2, wherein the CAN lines comprise twisted pair data lines, and the twisted pair data lines comprise two DCAN diagnosis lines, two battery pack diagnosis CAN lines, two ground lines, one power line, two ISG generator controller CAN debugging lines, two four-in-one CAN debugging lines, two power PCAN communication lines and two entertainment system ECAN communication lines.
4. The vehicle-mounted fault diagnosis system according to claim 3, wherein the CAN line is a line further comprising an ABS diagnosis CAN line;
the ABS diagnosis CAN line is a single data line.
5. The vehicle-mounted fault diagnosis system according to claim 1, characterized in that the system is used in vehicle-mounted fault diagnosis of a test vehicle.
6. The vehicle-mounted fault diagnosis system according to claim 3, wherein the baud rate of the PCAN communication line is 250kbps, the baud rate of the battery pack diagnosis CAN line is 250kbps, the baud rate of the entertainment system ECAN line communication line is 500kbps, the baud rate of the four-in-one debugging CAN line is 250kbps, and the baud rate of the DCAN diagnosis line is 250 kbps.
7. The vehicle-mounted fault diagnosis system according to claim 3, wherein the DCAN diagnosis line of the main control interface is used for diagnosing the whole vehicle, and the DCAN diagnosis line of the auxiliary control interface is used for diagnosing the ECU.
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| CN202111545249.7A CN114265387A (en) | 2021-12-16 | 2021-12-16 | Vehicle-mounted fault diagnosis system |
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| CN202111545249.7A CN114265387A (en) | 2021-12-16 | 2021-12-16 | Vehicle-mounted fault diagnosis system |
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2021
- 2021-12-16 CN CN202111545249.7A patent/CN114265387A/en active Pending
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Application publication date: 20220401 |