CN114978971A - Complete vehicle CAN network communication fault testing device and testing method - Google Patents

Complete vehicle CAN network communication fault testing device and testing method Download PDF

Info

Publication number
CN114978971A
CN114978971A CN202210432360.3A CN202210432360A CN114978971A CN 114978971 A CN114978971 A CN 114978971A CN 202210432360 A CN202210432360 A CN 202210432360A CN 114978971 A CN114978971 A CN 114978971A
Authority
CN
China
Prior art keywords
module
resistance
testing
network communication
test
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210432360.3A
Other languages
Chinese (zh)
Inventor
朱恩岐
翟来涛
吴志兴
张广贺
蒋大顺
王键
马铭强
于波
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FAW Group Corp
Original Assignee
FAW Group Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FAW Group Corp filed Critical FAW Group Corp
Priority to CN202210432360.3A priority Critical patent/CN114978971A/en
Publication of CN114978971A publication Critical patent/CN114978971A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/50—Testing arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/06—Management of faults, events, alarms or notifications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L2012/40208—Bus networks characterized by the use of a particular bus standard
    • H04L2012/40215—Controller Area Network CAN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L2012/40267—Bus for use in transportation systems
    • H04L2012/40273—Bus for use in transportation systems the transportation system being a vehicle

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

A whole vehicle CAN network communication fault testing device and a testing method. The invention relates to the field of vehicle detection, in particular to a CAN network communication fault diagnosis technology, and solves the problem that in the prior art, a test result is easy to generate errors. The whole vehicle CAN network communication fault testing device comprises: the device comprises a power supply module, a resistance testing module, a voltage testing module and a connecting module; the power supply module is used for continuously providing stable voltage, the resistance test module is used for detecting CAN bus terminal resistance, the voltage test module is used for confirming state voltage of CAN-H and CAN-L, and the connection module is respectively electrically connected with the power supply module, the resistance test module and the voltage test module and is electrically connected with a whole vehicle CAN network to form a closed detection loop. A method for testing by applying the fault testing equipment is also provided. The invention CAN be applied to the fault detection of the whole vehicle CAN network communication, and has the advantages of simple operation, high detection efficiency and accurate result.

Description

Complete vehicle CAN network communication fault testing device and testing method
Technical Field
The invention relates to the field of vehicle detection, in particular to a CAN network communication fault diagnosis technology.
Background
With the integration of the whole vehicle wiring harness, CAN network communication faults are more and more common, and as a high-frequency problem in the vehicle debugging process, the diagnosis mode of the whole vehicle network communication is carried out in the vehicle at present. The diagnosis interface of a general vehicle OBD (on-board automatic diagnosis system) is provided with 16 pins and 7 groups of CAN signals, each group of CAN network is detected by using a universal meter, each group of signal test needs to be carried out by a series of work such as universal meter gear switching, vehicle power on and off, signal line leading-out and the like, two persons are needed to cooperate to carry out the signal test, the operation space in a vehicle is narrow, a single trolley needs to carry out 14 times of repeated work, the test process is complex and time-consuming, and the average test duration is about 40 minutes. Meanwhile, the whole vehicle network test is carried out in a vehicle, and is easily interfered by vehicle states such as poor grounding, electric quantity fluctuation and the like, and deviation occurs in an actual measurement result. The signal line is led out by manual operation in the test, and the condition that debugging personnel is misled by error results generated by operation errors exists.
Disclosure of Invention
The invention provides a whole vehicle CAN network communication fault testing device and a testing method, aiming at solving the problem that the testing result of the existing whole vehicle CAN network communication testing technology is easy to generate errors.
The technical scheme of the invention is as follows:
the utility model provides a whole car CAN network communication fault test equipment, test equipment includes: the device comprises a power supply module, a resistance testing module and a voltage testing module;
the power supply module is used for continuously providing stable voltage, the resistance test module is used for detecting CAN bus terminal resistance, the voltage test module is used for confirming state voltage of CAN-H and CAN-L, and the resistance test module and the voltage test module connecting module are respectively connected with the power supply module to form a closed detection loop.
Preferably, the power supply module adopts a triode to realize power isolation and adopts a bias resistor to realize automatic switch control.
Preferably, the resistance testing module comprises a resistor, a red light emitting diode, a green light emitting diode, a yellow light emitting diode and an operational amplifier; the resistance comprises a comparison resistance and a current-limiting resistance, the comparison resistance is used for comparing the size of a terminal resistance in the circuit, the compared output result is sent to the operational amplifier, the operational amplifier selects two sampling points and is respectively connected with the equidirectional end and the reverse end, the two sampling points are compared, and whether the light-emitting diode is lightened or not is determined after the comparison.
Preferably, the comparison resistance comprises a 55 Ω resistance and a 65 Ω resistance.
Preferably, the voltage testing module comprises a resistor, a PNP triode, an NPN triode, a light emitting diode and an operational amplifier; the same-direction end of the operational amplifier is connected with the CAN-H, the reverse end of the operational amplifier is connected with the CAN-L, and if the CAN-H is normal, the PNP triode is conducted; if CAN-H is more than CAN-L, the operational amplifier outputs '1' to supply power to the light-emitting diode; if the CAN-L is normal, the NPN triode is conducted, and the light emitting diode is grounded and lightened.
Preferably, the test equipment further comprises a relay switching module for a resistance switching function in the resistance test module.
Preferably, the test device further comprises a self-checking module, which is used for implementing a self-checking function in the test device.
The invention also provides a complete vehicle CAN network communication fault testing method, which applies the fault testing equipment and specifically comprises the following steps:
firstly, turning on a power supply of test equipment, and connecting the power supply with a CAN OBD socket of a whole vehicle;
step two, powering off the whole vehicle, selecting a resistance test gear of the test equipment, and if red light is lighted, indicating that a line fault needs to be checked; if the green light emitting diode is lightened, the terminal resistance of the whole vehicle is larger than 55 omega, otherwise, the terminal resistance of the whole vehicle is smaller than or equal to 55 omega; at the moment, a relay change-over switch is pressed down and is switched to another comparison circuit, if a yellow light-emitting diode is lightened, the terminal resistance of the whole vehicle is less than 65 omega, otherwise, the terminal resistance of the whole vehicle is more than or equal to 65 omega;
and step three, electrifying the whole vehicle, selecting a voltage test gear for the test equipment, if the light-emitting diode is lightened, indicating that the CAN line voltage is normal and CAN-H is more than CAN-L, otherwise indicating that the line fault needs to be checked.
The invention also provides a computer readable storage medium for storing a computer program, wherein the computer program executes the whole vehicle CAN network communication fault testing method.
Compared with the prior art, the invention solves the problem that the test result of the whole vehicle CAN network communication test technology is easy to have errors, and has the following specific beneficial effects:
1. the measuring efficiency is improved, the working time is saved, two signals of voltage and resistance are measured through one-time operation, the labor cost and the time cost are saved, and the accurate and rapid detection capability is realized.
2. The invention simplifies the complex leading-out mode of the CAN network signal wire of the whole vehicle into the leading-out mode of the OBD quick connector, has the function of knob switching by universal processing of equipment interfaces, has wide applicability and CAN realize the parallel development of multi-project work.
3. The invention uses an independent power supply and has a voltage stabilizing system, a stable test environment is set up, a mistake-proofing universal interface is adopted, a test result feedback system is provided, and the test result is fed back through the status light, so that the test accuracy is ensured.
Drawings
FIG. 1 is a schematic diagram of the working principle of the fault testing device provided by the present invention
FIG. 2 is a schematic diagram of a structural principle of a fault testing apparatus provided in the present invention;
FIG. 3 is a schematic diagram of the structural principle of the resistance testing module according to the present invention;
fig. 4 is a schematic structural diagram of the voltage testing module according to the present invention.
Detailed Description
In order to make the technical solutions of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the specification of the present invention, and it should be noted that the following embodiments are only used for better understanding of the technical solutions of the present invention, and should not be construed as limiting the present invention.
Example 1.
This embodiment provides a whole car CAN network communication fault test equipment, shown fault test equipment theory of operation schematic diagram is shown in figure 1, test equipment includes: the device comprises a power supply module, a resistance testing module and a voltage testing module;
the power supply module is used for continuously providing stable voltage, the resistance test module is used for detecting CAN bus terminal resistance, the voltage test module is used for confirming state voltage of CAN-H and CAN-L, and the resistance test module and the voltage test module connecting module are respectively connected with the power supply module to form a closed detection loop.
The testing equipment integrates the power supply module, the resistance testing module, the voltage testing module and other functional modules, the structural principle schematic diagram of the testing equipment is shown in FIG. 2, the whole structure of the equipment is integrated and fused with a plurality of groups of modules, the testing equipment is accurate, reliable, portable and efficient, and the production efficiency can be effectively improved; this equipment uses independent power module, does not rely on power in the car, does not need narrow and small car inner space to carry out test work again, and the tester comfort level promotes to some extent.
Example 2.
This embodiment is a further example of embodiment 1, wherein the power supply module uses a triode to implement power isolation, and uses a bias resistor to implement automatic switching control.
The power module utilizes the triode characteristic, realizes the power isolation effect to guarantee that test intergroup does not influence each other, design constant voltage power supply guarantees that the power supply is stable, and sustainable 5V electricity that provides has been avoided because of the measurement result deviation that the electric quantity is unstable to this kind of stable test environment.
Example 3.
This embodiment is a further illustration of embodiment 1, wherein the resistance testing module includes a resistor, a red led, a green led, a yellow led, and an operational amplifier; the resistance comprises a comparison resistance and a current-limiting resistance, the comparison resistance is used for comparing the size of a terminal resistance in the circuit, the compared output result is sent to the operational amplifier, the operational amplifier selects two sampling points and is respectively connected with the equidirectional end and the reverse end, the two sampling points are compared, and whether the light-emitting diode is lightened or not is determined after the comparison.
And connecting the terminal resistor in parallel to a resistor comparison circuit of the resistor test module, outputting '0' by the operational amplifier if the resistance values of two sides of the comparison result are equal, outputting '1' by the operational amplifier if the resistance values are unequal, and turning on and lighting the light emitting diode at the moment. The detection result of the equipment is displayed by three light-emitting diodes, so that the feedback of the test result is accurate and easy to judge. The schematic diagram of the working principle of the resistance testing module described in this embodiment is shown in fig. 3, in the diagram, the left light emitting diode is green, the middle light emitting diode is red, and the right light emitting diode is yellow, and if the green and yellow are both lighted in a single detection cycle, the resistance is normal, and if the red is lighted, the line fault needs to be checked.
Example 4.
This example is a further illustration of example 3, wherein the comparison resistances comprise a 55 Ω resistance and a 65 Ω resistance.
The theoretical value of the terminal resistor of the CAN network communication is 60 omega, and because the terminal resistor is inconsistent and has small deviation in practice, the detection interval is set to be 55 omega-65 omega so as to eliminate errors.
Example 5.
The present embodiment is a further illustration of embodiment 1, wherein a schematic view of an operating principle of the voltage testing module is shown in fig. 4, which includes a resistor, a PNP triode, an NPN triode, a light emitting diode, and an operational amplifier; the same-direction end of the operational amplifier is connected with the CAN-H, the reverse end of the operational amplifier is connected with the CAN-L, and if the CAN-H is normal, the PNP triode is conducted; if CAN-H is more than CAN-L, the operational amplifier outputs '1' to supply power to the light-emitting diode; if the CAN-L is normal, the NPN triode is conducted, and the light emitting diode is grounded and lightened.
The testing equipment is used for confirming the state voltages of the CAN-H and the CAN-L, generally speaking, the voltage Vcan-H of the CANH is 2.6-2.8 v, the voltage Vcan-L of the CAN L is 2.2-2.4 v, the base electrode conduction voltage of the triode is larger than 0.7v, meanwhile, in order to ensure that Vcan-H is larger than Vcan-L, an operational amplifier is arranged for comparing the voltages of the two, and the green light emitting diode CAN be lightened normally by outputting '1'.
Example 6.
This embodiment is a further illustration of embodiment 1, wherein the testing device further includes a relay switching module, which is used for a resistance switching function in the resistance testing module.
Example 7.
This embodiment is a further illustration of embodiment 1, wherein the test device further includes a self-test module, configured to implement a self-test function in the test device.
Example 8.
The embodiment provides a method for testing a communication fault of a finished automobile CAN network, wherein the method for testing the communication fault of the finished automobile CAN network applies any one of the fault testing equipment in the embodiments 1-7, and specifically comprises the following steps:
firstly, turning on a power supply of test equipment, and connecting the power supply with a CAN OBD socket of a whole vehicle;
step two, powering off the whole vehicle, selecting a resistance test gear by test equipment, and if red light is lightened, indicating that a line fault needs to be checked; if the green light emitting diode is lightened, the terminal resistance of the whole vehicle is larger than 55 omega, otherwise, the terminal resistance of the whole vehicle is smaller than or equal to 55 omega; at the moment, a relay change-over switch is pressed down and is switched to another comparison circuit, if a yellow light-emitting diode is lightened, the terminal resistance of the whole vehicle is less than 65 omega, otherwise, the terminal resistance of the whole vehicle is more than or equal to 65 omega;
and step three, electrifying the whole vehicle, selecting a voltage test gear for the test equipment, if the light-emitting diode is lightened, indicating that the CAN line voltage is normal and CAN-H is more than CAN-L, otherwise indicating that the line fault needs to be checked.
This embodiment can accomplish 7 groups of signal synchronous detection, eliminates universal meter gear switching, and the vehicle is gone up and down electricity, the repetitive operation that the signal line was drawn forth, and single can accomplish the operation, and the single-unit car only need carry out 2-3 tests alright completion, and the average test duration is 2 minutes.
The test device has the advantages that the independent power supply is used, the voltage stabilizing system is provided, the stable test environment is set up, the error-proof universal interface is adopted, the test result feedback system is provided, the test result is fed back through the status light, the test accuracy is guaranteed, and the test success rate is 100%.
By adopting flexible design modes such as a standard diagnosis interface, a knob switching channel and the like, the universal interfaces of a vehicle end and a signal reading end are realized, the test method can be compatible with red-flag full-system vehicle types, and the test range can cover 100% of the controller of the whole vehicle.
Example 9.
The embodiment provides a computer-readable storage medium for storing a computer program, wherein the computer program executes the entire vehicle CAN network communication fault testing method according to the embodiment 8.

Claims (9)

1. The utility model provides a whole car CAN network communication fault test equipment which characterized in that, test equipment includes: the device comprises a power supply module, a resistance testing module and a voltage testing module;
the power supply module is used for continuously providing stable voltage, the resistance test module is used for detecting CAN bus terminal resistance, the voltage test module is used for confirming state voltage of CAN-H and CAN-L, and the resistance test module and the voltage test module connecting module are respectively connected with the power supply module to form a closed detection loop.
2. The vehicle CAN network communication fault testing device of claim 1, wherein the power supply module employs a triode to achieve power isolation and a bias resistor to achieve automatic on-off control.
3. The vehicle-wide CAN network communication fault testing device of claim 1, wherein the resistance testing module comprises a resistor, a red light emitting diode, a green light emitting diode, a yellow light emitting diode, and an operational amplifier; the resistance comprises a comparison resistance and a current-limiting resistance, the comparison resistance is used for comparing the size of a terminal resistance in the circuit, the compared output result is sent to the operational amplifier, the operational amplifier selects two sampling points and is respectively connected with the equidirectional end and the reverse end, the two sampling points are compared, and whether the light-emitting diode is lightened or not is determined after the comparison.
4. The vehicle CAN network communication fault testing device of claim 3, wherein the comparison resistor comprises a 55 Ω resistor and a 65 Ω resistor.
5. The vehicle-wide CAN network communication fault testing device of claim 1, wherein the voltage testing module comprises a resistor, a PNP triode, an NPN triode, a light emitting diode, and an operational amplifier; the same-direction end of the operational amplifier is connected with the CAN-H, the reverse end of the operational amplifier is connected with the CAN-L, and if the CAN-H is normal, the PNP triode is conducted; if CAN-H is more than CAN-L, the operational amplifier outputs '1' to supply power to the light-emitting diode; if the CAN-L is normal, the NPN triode is conducted, and the light emitting diode is grounded and lightened.
6. The vehicle-wide CAN network communication fault testing device of claim 1, further comprising a relay switching module for a resistance switching function in the resistance testing module.
7. The vehicle-wide CAN network communication fault testing device of claim 1, wherein the testing device further comprises a self-test module for implementing a self-test function in the testing device.
8. A whole vehicle CAN network communication fault testing method is characterized in that the testing method applies the fault testing equipment of any one of claims 1 to 7, and specifically comprises the following steps:
firstly, turning on a power supply of test equipment, and connecting the power supply with a CAN OBD socket of a whole vehicle;
step two, powering off the whole vehicle, selecting a resistance test gear of the test equipment, and if red light is lighted, indicating that a line fault needs to be checked; if the green light emitting diode is lightened, the terminal resistance of the whole vehicle is larger than 55 omega, otherwise, the terminal resistance of the whole vehicle is smaller than or equal to 55 omega; at the moment, a relay change-over switch is pressed down and is switched to another comparison circuit, if a yellow light-emitting diode is lightened, the terminal resistance of the whole vehicle is less than 65 omega, otherwise, the terminal resistance of the whole vehicle is more than or equal to 65 omega;
and step three, electrifying the whole vehicle, selecting a voltage test gear for the test equipment, if the light-emitting diode is lightened, indicating that the CAN line voltage is normal and CAN-H is more than CAN-L, otherwise indicating that the line fault needs to be checked.
9. A computer-readable storage medium for storing a computer program for performing the entire vehicle CAN network communication failure testing method of claim 8.
CN202210432360.3A 2022-04-23 2022-04-23 Complete vehicle CAN network communication fault testing device and testing method Pending CN114978971A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210432360.3A CN114978971A (en) 2022-04-23 2022-04-23 Complete vehicle CAN network communication fault testing device and testing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210432360.3A CN114978971A (en) 2022-04-23 2022-04-23 Complete vehicle CAN network communication fault testing device and testing method

Publications (1)

Publication Number Publication Date
CN114978971A true CN114978971A (en) 2022-08-30

Family

ID=82978975

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210432360.3A Pending CN114978971A (en) 2022-04-23 2022-04-23 Complete vehicle CAN network communication fault testing device and testing method

Country Status (1)

Country Link
CN (1) CN114978971A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN207067329U (en) * 2017-08-23 2018-03-02 北京新能源汽车股份有限公司 A kind of insulation detection device
CN108845554A (en) * 2018-04-04 2018-11-20 北京福田戴姆勒汽车有限公司 The test macro and method of vehicle body central control unit
CN111751646A (en) * 2020-06-22 2020-10-09 上海申克机械有限公司 Electric automobile offline detection system and method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN207067329U (en) * 2017-08-23 2018-03-02 北京新能源汽车股份有限公司 A kind of insulation detection device
CN108845554A (en) * 2018-04-04 2018-11-20 北京福田戴姆勒汽车有限公司 The test macro and method of vehicle body central control unit
CN111751646A (en) * 2020-06-22 2020-10-09 上海申克机械有限公司 Electric automobile offline detection system and method

Similar Documents

Publication Publication Date Title
CN105911417A (en) Testing device of testing on and off and correctness of cable and method thereof
CN104569730A (en) Cable testing system applied to minisatellite
CN106444712A (en) CAN/LIN network interference automation test system
CN204731364U (en) A kind of portable polycore cable distribution tester
CN202329648U (en) Rate gyroscope combined unit tester
US20160068073A1 (en) DC Fast Charge Testing Method and System for Electric Vehicles
CN111830428A (en) Automatic detection system for cable wiring
CN205665346U (en) Testing arrangement of test cable break -make and exactness
CN108205093B (en) Cable connection proofreading instrument for engineering construction
CN108152650A (en) The automatic line inspection system of multicore cable
CN210168053U (en) Automatic test system for automobile Ethernet
JPH07159474A (en) Device for diagnosing electrical wiring of vehicle
CN112578206A (en) Performance testing device for battery management system
CN114978971A (en) Complete vehicle CAN network communication fault testing device and testing method
CN202870262U (en) Durability tester for automobile relay
CN216718575U (en) Microcomputer cable detector for railway signal
CN112327114B (en) Heater resistance insulation measuring device suitable for spacecraft thermal test
CN210572628U (en) Device for testing feedback circuit of PG motor
CN211627742U (en) Automobile circuit measuring device
CN211293113U (en) Test tool of battery management system
CN210347704U (en) Automobile circuit detection device
CN203422442U (en) Cable detector
CN219285377U (en) Unmanned aerial vehicle all-in-one cable automatic testing device
CN218450153U (en) Offline vehicle bus detection device
CN205581265U (en) Testing arrangement of self -service financial equipment SIU module

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination