Internal electric locomotive electric line fault analyzer

Abstract

The utility model relates to the technical field of electric line detection, in particular to an internal electric locomotive electric line fault analyzer, which comprises a test master module, a test slave module and two test probes, the test master module and the test slave module are in grounding connection through a common ground wire, and the test master module and the test slave module are both electrically connected with the test probes. The test master module comprises a controller 1, a communication unit 1 and a measurement unit 1, the communication unit 1 and the measurement unit 1 are electrically connected with the controller 1, the test slave module comprises a controller 2, a communication unit 2 and a measurement unit 2, the communication unit 2 and the measurement unit 2 are electrically connected with the controller 2, and each of the measurement unit 1 and the measurement unit 2 comprises a current excitation unit and a data processing unit which are electrically connected with the controller 1 or the controller 2. And the data processing unit is electrically connected with the voltage acquisition unit, and the voltage acquisition unit is electrically connected to the test meter pen, so that long-distance accurate measurement of the electric circuit of the internal electric locomotive can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of electric circuit detection, in particular to an electric circuit fault analyzer for internal motor vehicles. Background Technique

[0002] With the continuous development of internal motor vehicles, electric circuits have entered an era of high modularization and integration, and the conduction test technology of electric circuits has become a key technology for detecting the electrical performance of electric circuits.

[0003] In the past, the conduction test technology of internal motor vehicle electric circuits mainly relied on conduction bells, multimeters and other conduction detection methods. For a relatively long cable, two staff members were required to hold multimeters at both ends of the cable and measure through auxiliary means such as shouting.

[0004] Using traditional conduction bells, multimeters and other conduction detection methods has many disadvantages. For example, during testing, it is necessary to test each point manually, resulting in low efficiency and inability to achieve long-distance communication; during measurement, it may also be affected by factors such as human operation and environmental interference, resulting in inaccurate measurement results, affecting the authenticity of test data and the integrity of data records.

[0005] If the above problems are not solved, it is very easy to cause misconnection of the circuit during the assembly process of the internal motor vehicle electric circuit, resulting in circuit electrical performance failures, signal communication failures and data transmission problems during the operation of the internal motor vehicle, affecting the normal operation of the internal motor vehicle. Therefore, a conduction test technology that can intelligently and automatically realize the conduction test of the internal motor vehicle electric circuit and achieve long-distance accurate measurement of the internal motor vehicle electric circuit is needed. Content of the Utility Model

[0006] The utility model provides an electric circuit fault analyzer for internal motor vehicles.

[0007] The technical solution of the utility model is as follows:

[0008] An electric circuit fault analyzer for internal motor vehicles includes a main test module, a slave test module and two test probes. The main test module and the slave test module are grounded through a common ground wire. The main test module is electrically connected to one test probe, and the slave test module is electrically connected to the other test probe.

[0009] The two test probes are respectively used for electrically connecting to both ends of the electric circuit to be measured.

[0010] The main test module includes a controller 1, a communication unit 1 and a measurement unit 1 that are all electrically connected to the controller 1. The measurement unit 1 is electrically connected to the test probe.

[0011] The slave test module includes a controller 2, a communication unit 2 and a measurement unit 2 that are all electrically connected to the controller 2. The measurement unit 2 is electrically connected to the test probe.

[0012] Both the measurement unit 1 and the measurement unit 2 include a current excitation unit and a data processing unit that are respectively electrically connected to the controller 1 or the controller 2. The data processing unit is electrically connected to a voltage acquisition unit, and the voltage acquisition unit is electrically connected to a test probe.

[0013] Specifically, the current excitation unit includes a D / A conversion chip and a current detection resistor electrically connected to the D / A conversion chip. The D / A conversion chip is electrically connected to the controller 1 or the controller 2, and the current detection resistor is electrically connected to the test probe.

[0014] Specifically, the data processing unit includes an AD conversion circuit, an amplification circuit, and a filtering circuit that are sequentially electrically connected. The AD conversion circuit is electrically connected to the controller 1 or the controller 2, and the filtering circuit is electrically connected to the voltage acquisition unit.

[0015] Specifically, the communication unit 1 includes a radio frequency chip electrically connected to the controller 1, a power amplifier, and a low-noise amplifier electrically connected to the radio frequency chip. The communication unit 2 includes a radio frequency chip electrically connected to the controller 2, a power amplifier, and a low-noise amplifier electrically connected to the radio frequency chip.

[0016] Further, the voltage acquisition unit is a voltage sensor and is electrically connected to both the filtering circuit and the test probe.

[0017] Preferably, both the controller 1 and the controller 2 are Cortex-A53 1.5GHz quad-core CPUs.

[0018] Preferably, the test main module further includes a display screen 1 and a keyboard 1 that are both electrically connected to the controller 1.

[0019] Preferably, the test slave module further includes a display screen 2 and a keyboard 2 that are both electrically connected to the controller 2.

[0020] Preferably, both the display screen 1 and the display screen 2 are IPS LCD screens.

[0021] The beneficial effects of the present utility model are as follows:

[0022] (1) The present utility model is an internal electric locomotive electric circuit fault analyzer. Based on the Lora spread spectrum modulation technology, a communication unit 1 and a communication unit 2 are respectively set in the test main module and the test slave module to realize long-distance wireless communication during the conduction process of the electric circuit, and have the ability of multi-point rapid detection, which can significantly improve the detection efficiency.

[0023] (2) The measurement unit of the internal electric locomotive electric circuit fault analyzer of the present utility model adopts the setting of a high-precision current source and a high-precision current detection resistor, ensuring the high precision and accuracy of the measurement, and realizing an automated and intelligent test process.

[0024] (3) The internal electric locomotive electric circuit fault analyzer of the present utility model can adapt to different test environments. Users can conveniently conduct continuity tests on the electric circuit through the movable electric circuit fault analyzer, greatly improving the convenience and reliability of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] By reading the detailed description of the preferred embodiments below, the solutions and advantages of the present application will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present utility model.

[0026] In the drawings:

[0027] Figure 1 It is a schematic diagram of the module composition structure of an internal electric locomotive electric circuit fault analyzer in the embodiment;

[0028] Figure 2 It is a schematic diagram of the measurement principle of an internal electric locomotive electric circuit fault analyzer in the embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the drawings.

[0030] Embodiment

[0031] This embodiment provides an internal electric locomotive electric circuit fault analyzer. Refer to Figure 1 , which includes a main test module, a slave test module and two test probes. The main test module and the slave test module are grounded through a common ground wire. The main test module is electrically connected to one test probe, and the slave test module is electrically connected to the other test probe.

[0032] The two test probes are respectively used for electrically connecting to both ends of the electric circuit to be measured.

[0033] The main test module includes a controller 1, a communication unit 1 and a measurement unit 1 that are all electrically connected to the controller 1. The measurement unit 1 is electrically connected to the test probe.

[0034] The slave test module includes a controller 2, a communication unit 2 and a measurement unit 2 that are all electrically connected to the controller 2. The measurement unit 2 is electrically connected to the test probe.

[0035] Both the measurement unit 1 and the measurement unit 2 include a current excitation unit and a data processing unit that are respectively electrically connected to the controller 1 or the controller 2. The data processing unit is electrically connected to a voltage acquisition unit, and the voltage acquisition unit is electrically connected to the test probe.

[0036] In the utility model, the test host and the test slave can be interchangeable, and it is not fixed to designate which one is the test host and which one is the test slave, which enhances the flexibility of the test and can adapt to different test scenarios. The test host and the test slave are connected to the common ground through a common ground line, and each is connected to a test probe, and the test probe is connected to the two ends of the electrical circuit under test through a transfer cable.

[0037] The test main module is used to issue test instructions and receive test data. The test main module includes a controller 1, a communication unit 1 and a measurement unit that are electrically connected to the controller 1. The controller 1 is a Cortex-A53 1.5GHz quad-core CPU, and the controller 1 is used to coordinate and control the various units and devices connected to it in the test main module. The communication unit 1 is used to transmit wireless signals and establish a communication connection with the test slave. The communication unit 1 includes a radio frequency chip electrically connected to the controller 1, a power amplifier and a low noise amplifier electrically connected to the radio frequency chip. The radio frequency chip of the test main module generates a wireless radio frequency signal under the instruction of the controller 1. The power amplifier is used to enhance the generated wireless radio frequency signal, and can also communicate with the test slave at a long distance. The low noise amplifier of the test main module does not work.

[0038] The test main module also includes a display screen 1 and a keyboard 1 both electrically connected to the controller 1, and both are arranged on the outer shell surface of the housing 1. The display screen 1 is an IPS LCD screen for displaying real-time test data with a resolution of 1280*720, and the keyboard 1 is used for the user to input test instructions.

[0039] The test slave module cooperates with the test master module and can receive signals sent by the test master module at a long distance. The test slave module includes a controller 2, a communication unit 2 and a measurement unit electrically connected to the controller 2. Among them, the controller 2 is a Cortex-A53 1.5GHz quad-core CPU, which is used to coordinate and control the various units and devices connected to it in the test slave module. The communication unit 2 is used to receive the handshake information transmitted from the test host and establish a communication connection. The communication unit 2 includes a radio frequency chip electrically connected to the controller 2, a power amplifier and a low noise amplifier electrically connected to the radio frequency chip. The radio frequency chip of the test slave module receives the wireless signal under the instruction of the controller 2 and transmits it to the low noise amplifier to improve the signal quality. The power amplifier of the test slave module does not work.

[0040] The test slave module also includes a display screen 2 and a keyboard 2 electrically connected to the controller 2, both of which are arranged on the outer shell surface of the housing 2. The display screen 2 is an IPS LCD screen, which is used to display real-time test data like the display screen 1, with a resolution of 1280*720, and the keyboard 2 is used for the user to set the test parameters.

[0041] The measurement unit is used for the generation of excitation signals and test calculations. The measurement unit includes a current excitation unit and a data processing unit that are electrically connected to Controller 1 or Controller 2 respectively. The data processing unit is electrically connected to a voltage acquisition unit, and the voltage acquisition unit is electrically connected to the electrical circuit under test.

[0042] Specifically, the current excitation unit is used to generate an excitation test current. The current excitation unit includes a D / A conversion chip and a current detection resistor electrically connected to the D / A conversion chip. The D / A conversion chip is electrically connected to Controller 1 or Controller 2, can receive instructions from the controller, convert digital signals into analog signals, and drive the current detection resistor to generate an accurate excitation current. The current detection resistor is a resistor with a fixed resistance value. By measuring the voltage Us across the current detection resistor Rs, the actual current value Is is calculated, and then the accuracy of the excitation current is verified. The current detection resistor is electrically connected to the test probe, and the generated excitation current is transmitted to the ground wire under test through the test probe for the conduction test of the ground wire.

[0043] The voltage acquisition unit is used to acquire voltage data between the test probes. The voltage acquisition unit is a voltage sensor and is electrically connected to both the filter circuit and the test probes. The voltage acquisition unit transmits the acquired voltage data to the data processing unit.

[0044] The data processing unit is used to filter, amplify, and perform AD conversion on the acquired voltage data. The data processing unit includes an AD conversion circuit, an amplification circuit, a filter circuit, and a calculation chip that are electrically connected in sequence. The AD conversion circuit is electrically connected to Controller 1 or Controller 2, and the filter circuit is electrically connected to the voltage acquisition unit. The filter circuit is used to remove the noise in the acquired analog voltage signal and transmit it to the amplification circuit. The amplification circuit is used to amplify the analog voltage signal. The AD conversion circuit converts the amplified analog voltage signal into a digital signal and transmits it to Controller 1 or Controller 2.

[0045] In this embodiment, the operating frequencies of Communication Unit 1 and Communication Unit 2 adopt the 433 MHz frequency band. The wireless communication has good anti-interference performance, the communication distance can reach up to 1 kilometer at most, and it also has the characteristics of low power consumption.

[0046] When testing the electrical circuit, first connect the test host and the test slave with a common ground connection wire. After the test probes are connected to both ends of the electrical circuit under test, start the conduction test. The measurement range is 1 Ω to 10 KΩ, and the measurement accuracy is ±5% ± 0.1 Ω.

[0047] When measuring the on-resistance Rx of an unknown electrical circuit, an excitation current Iref is generated by the D / A conversion chip. The excitation current passes through the current detection resistor Rs, the resistance Rx under test, and the line resistances RL1 and RL2 of the two transfer cables and then reaches the signal ground. As Figure 2 shown, by measuring the voltage Us across the current detection resistor Rs, the actual current value Then measure the voltage Ux across the resistance of the electrical circuit under test to obtain the total resistance value, and subtract the line resistance compensation value of the transfer cable to obtain the actual value of the resistance Rx of the electrical circuit under test.

[0048] The utility model can replace traditional detection methods such as conduction bells and multimeters, and realize fast detection of multiple points and long distances on the electrical circuit of the internal motor vehicle.

Claims

1. An internal electric locomotive circuit fault analyzer, characterized in that: The device comprises a test main module, a test slave module and two test probes. The test main module and the test slave module are grounded via a common ground line. The test main module is electrically connected to one test probe, and the test slave module is electrically connected to the other test probe. The two test leads are respectively used to electrically connect to the two ends of the electrical circuit under test. The test main module includes a controller 1, a communication unit 1 and a measuring unit 1 which are electrically connected to the controller 1, and the measuring unit 1 is electrically connected to the test probe. The test slave module includes a controller 2, a communication unit 2 and a measuring unit 2 electrically connected to the controller 2, wherein the measuring unit 2 is electrically connected to the test probe. The measuring unit 1 and the measuring unit 2 both include a current excitation unit and a data processing unit electrically connected to the controller 1 or the controller 2 respectively, the data processing unit is electrically connected to the voltage acquisition unit, and the voltage acquisition unit is electrically connected to the test probe.

2. The electric circuit fault analyzer for an internal electric locomotive according to claim 1, characterized in that: The current excitation unit includes a D / A conversion chip and a current-sensing resistor electrically connected to the D / A conversion chip, the D / A conversion chip is electrically connected to the controller 1 or the controller 2, and the current-sensing resistor is electrically connected to the test probe.

3. The electric circuit fault analyzer for an internal electric locomotive according to claim 1, characterized in that: The data processing unit comprises an AD conversion circuit, an amplifying circuit and a filtering circuit which are electrically connected in sequence. The AD conversion circuit is electrically connected to the controller 1 or the controller 2, and the filtering circuit is electrically connected to the voltage acquisition unit.

4. The electric circuit fault analyzer for an internal electric locomotive according to claim 1, characterized in that: The communication unit 1 includes a radio frequency chip electrically connected to the controller 1, a power amplifier and a low noise amplifier electrically connected to the radio frequency chip, and the communication unit 2 includes a radio frequency chip electrically connected to the controller 2, a power amplifier and a low noise amplifier electrically connected to the radio frequency chip.

5. The electric circuit fault analyzer for an internal electric locomotive according to claim 1, characterized in that: The voltage acquisition unit is a voltage sensor, which is electrically connected to the filter circuit and the test probe.

6. The electric circuit fault analyzer for an internal electric locomotive according to claim 1, characterized in that: The controller 1 and the controller 2 are both Cortex-A53 1.5 GHz quad-core CPUs.

7. The electric circuit fault analyzer for an internal electric locomotive according to claim 1, characterized in that: The test main module also includes a display screen 1 and a keyboard 1 both electrically connected to the controller 1 .

8. The electric circuit fault analyzer for an internal electric locomotive according to claim 1, characterized in that: The test slave module also includes a display screen 2 and a keyboard 2 both electrically connected to the controller 2 .

9. An internal electric locomotive electric circuit fault analyzer according to claim 7 or 8, characterized in that: The display screen 1 and the display screen 2 are both IPS LCD screens.

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