Auxiliary device for electrical performance test of motor vehicle parts

Abstract

The utility model discloses an auxiliary device for an electrical performance test of motor vehicle parts, which comprises a shell, a circuit board is arranged in the shell, a plurality of groups of circuits are arranged on the circuit board, the circuit board is respectively connected with a first port and a second port through a first connecting line and a second connecting line, and an operation panel is arranged on the shell. Each group of circuits on the circuit board is connected with a corresponding unit on the operation panel, and each group of units comprises a port A, a port B and a switch. According to the utility model, through operation of the key switches of different lines, open circuit test operation of corresponding lines can be realized. By connecting the ports A or ports of different lines to the target wire harness of the short-circuit test, the short-circuit test operation of the corresponding lines can be carried out.

Description

Technical Field

[0001] The present application relates to the field of test auxiliary devices, and in particular to an auxiliary device for electrical performance testing of motor vehicle parts. Background Art

[0002] With the rapid development of the intelligent connected vehicle industry, information technology is widely used in the automotive industry, particularly in components containing Ethernet, USB, and other ports. In the automotive component sector, in addition to RJ45 Ethernet ports and various USB ports, LVDS for camera communication and some specialized shielded wiring harness integrated ports are also widely used. To further improve the electrical safety of automotive components, it is necessary to test the electrical performance of automotive components in accordance with the requirements of ISO 16750-2 or GB / T 28046.2. Electrical performance test items for automotive components mainly include supply voltage range, overvoltage, temperature rise test, noise test, insulation withstand voltage test, supply voltage ramp-down and ramp-up test, supply voltage transient drop, reset characteristics, startup characteristics, reverse voltage, open circuit, short circuit protection, withstand voltage, insulation resistance, and other aspects. To further improve the safety of automotive components, some automotive companies require open circuit and short circuit testing for shielded wiring harnesses such as USB and LVDS. Wiring harnesses for USB and LVDS typically use integrated, shielded wiring harnesses. During electrical performance testing, testers cannot directly perform open-circuit or short-circuit tests on the individual wires within the shield layer. Therefore, testers typically need to first destroy the shield layer before conducting the test. Damage to the shield layer can significantly degrade the communication performance of the tested wire harness. Summary of the Invention

[0003] The problem to be solved by the utility model is: to provide an auxiliary device for electrical performance testing of motor vehicle parts, to realize the operational convenience of the integrated and shielded communication port in open circuit and short circuit tests, to reduce the inaccurate performance judgment caused by the degradation of communication performance due to damage to the shielding layer of the wiring harness, and to effectively improve the efficiency and accuracy of open circuit and short circuit tests.

[0004] In order to solve the above problems, the present utility model provides an auxiliary device for electrical performance testing of motor vehicle parts, which includes a shell, a circuit board is provided in the shell, and multiple groups of circuits are provided on the circuit board. The circuit board is connected to port one and port two through connecting line one and connecting line two, respectively. An operation panel is provided on the shell, and each group of circuits on the circuit board is connected to a corresponding unit on the operation panel. Each group of units includes port A, port B, and a switch.

[0005] Preferably, the circuit board is arranged in the housing through a supporting structure.

[0006] Preferably, the shell is a metal shielding shell.

[0007] Preferably, the port A and port B are two embedded wiring ports of the same circuit, distributed at both ends of the switch, and can be connected to an external power supply line during a short-circuit test.

[0008] Preferably, the switch is a push button switch or an external signal triggered switch.

[0009] Preferably, the port 1 and the port 2 are signal connection ports, and are fixed protocol ports or integrated ports.

[0010] More preferably, the integrated ports include USB, Type C, RJ45, FGG / ECG, DB9, and LVDS.

[0011] Preferably, the circuit board is a wiring board or a printed circuit board.

[0012] This utility model can be used as an auxiliary device for electrical performance testing of integrated and shielded communication ports, effectively improving the accuracy of open and short circuit test results. At the same time, it avoids damage to the wiring harness during testing and can also realize electrical performance testing of some communication ports such as CAN and LIN integrated into DB9 ports.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. This utility model enables rapid testing of open and short circuit electrical performance in accordance with ISO 16750-2 for motor vehicle components containing shielded wiring harnesses. It can also be used for open and short circuit electrical performance testing of unshielded wiring harnesses.

[0015] 2. The utility model can perform electrical performance tests without destroying the original wiring harness, thus avoiding degradation of the communication performance of the original wiring harness.

[0016] 3. This utility model can be applied to the electrical performance test of USB 2.0, USB 3.0, Ethernet and other communication harnesses.

[0017] 4. This utility model can be applied to a variety of USB Type A, USB Type B, and USB Type C ports.

[0018] 5. This utility model can be used for open circuit and short circuit tests of shielded cables with special ports such as FGG / ECG and DB9. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A perspective view of an auxiliary device for electrical performance testing of motor vehicle parts provided by the present invention;

[0020] Figure 2 is a schematic diagram of the operation panel;

[0021] Figure 3 This is a schematic diagram of the circuit board. DETAILED DESCRIPTION

[0022] In order to make the present invention more clear and easy to understand, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0023] An auxiliary device for electrical performance testing of motor vehicle components includes a housing 1, within which is disposed a circuit board 5, which is secured within the housing 1 via a support structure 6. Circuit board 5 is provided with multiple groups of circuits, which are connected to port 1 3 and port 2 4 via connecting wire 1 7 and connecting wire 2 8, respectively. An operating panel 2 is provided on the housing 1, and each group of circuits on circuit board 5 is connected to a corresponding unit on operating panel 2. Each unit group includes port A, port B, and switch C.

[0024] The housing 1 is a metal or non-metal shielding housing. For shielded wiring harnesses, a metal shielding housing is used. Preferably, the shielding metal housing is made of a metal with high electrical conductivity, such as steel, copper, or aluminum. Preferably, the electrical conductivity is greater than 10MS / m. Preferably, the shielding effectiveness is greater than 50dB. Preferably, the DC impedance at the connection of the metal shielding housing is less than 2mΩ. For unshielded wiring harnesses, either a metal or non-metal housing can be used.

[0025] The operation panel 2 is an operation interface and port for electrical performance tests such as open circuit and short circuit, and includes multiple groups of ports A, ports B and switches C for open circuit tests and short circuit tests.

[0026] Ports A and B are two embedded wiring ports for the same circuit. They can be connected to external power lines, for example, to perform short-circuit testing. Ports A and B are located at both ends of switch C and can also be used to confirm the state and impedance of switch C.

[0027] The switch C is used to control the connection and disconnection of the circuit and perform an open circuit test on the circuit. The switch C can be a push-button switch or a signal-triggered switch. Preferably, when the switch is disconnected, the impedance across the circuit is greater than 10 MΩ.

[0028] Port 1 3 and Port 2 4 are signal connection ports at both ends of the device. They can be any communication connection port, such as USB, Type C, RJ45, FGG / ECG, DB9, LVDS, etc., including fixed protocol ports and specific integrated ports.

[0029] The device circuit board 5 can be a wiring board or a printed circuit board. Preferably, a printed circuit board is used. Preferably, different circuits can be distributed on different layers of the printed circuit board. The printed circuit board needs to maintain stable signal transmission. Preferably, signal symmetry needs to be ensured in the printed circuit board design.

[0030] The support structure 6 is an insulating support structure used to fix the device circuit board 5 to prevent the circuit board from changing position when the switch button is operated. Preferably, the insulation resistance is greater than 10MΩ.

[0031] The connecting line 1 7 and the connecting line 2 8 are the connecting lines between the port 1 3 and the port 2 4 and the circuit board 5. Preferably, the characteristics of the connecting line 1 7 and the connecting line 2 8 should be consistent with the characteristics of the port harness.

[0032] Example 1

[0033] USB2.0 cable application cases:

[0034] 1. The device shell is made of metal, and port 1 and port 2 at both ends of the shell are USB2.0 ports respectively.

[0035] 2. Port 1 and Port 2 contain one set of Type A USB 2.0 interface (female) and one set of Type B USB 2.0 interface (female).

[0036] 3. The circuit board uses a printed circuit board. There are 4 lines on the printed circuit board: line 1 is the VCC of the USB port, line 2 is the DATA+ of the USB port, line 3 is the DATA- of the USB port, and line 4 is the GND of the USB port.

[0037] 4. Connect the Type A USB 2.0 female port and the Type B USB 2.0 female port in Port 1 to the corresponding circuits on the printed circuit board. Similarly, connect the Type A USB 2.0 female port and the Type B USB 2.0 female port in Port 2 to the corresponding circuits on the printed circuit board.

[0038] 5. Connect a push button switch in series on line 1, line 2, line 3 and line 4 respectively to achieve independent control of the on and off of the corresponding lines.

[0039] 6. Two sockets are respectively brought out on line 1, line 2, line 3 and line 4, so that the corresponding lines can be independently connected to the external circuit.

[0040] Example 2

[0041] Open circuit test:

[0042] 1. As in Example 1, connect the USB 2.0 ports on both ends of the USB drive to a car USB hub. Connect the car USB hub to a computer. The car USB hub is powered by a 13.5V DC power supply. The computer can access data from the USB drive through the car USB hub.

[0043] 2. Perform a single-line open circuit test or a multi-line open circuit test in accordance with the open circuit test requirements in 4.9 of ISO 16750-2:2012.

[0044] 3. Perform a single-line open circuit test by independently disconnecting the switches for Line 1, Line 2, Line 3, and Line 4. Observe the computer reading data from the USB flash drive through the vehicle's USB hub.

[0045] 4. Perform a multi-line open circuit test by disconnecting lines 1 and 4, or lines 2 and 3, at the same time. Observe the computer transferring data from the USB flash drive through the vehicle's USB hub during the test.

[0046] 5. The impedance under the above open-circuit conditions meets the requirement of ISO 16750-2:2012, 4.9, that the open-circuit impedance is not less than 10MΩ.

[0047] Example 3

[0048] Short circuit test:

[0049] 1. According to the USB 2.0 implementation plan in Implementation Case 1, connect the sockets on Line 1, Line 2, Line 3, and Line 4 to the outside and perform the short-circuit test in Section 4.10 of ISO 16750-2:2012.

[0050] 2. Connect line 1 connected to VCC and line 4 connected to GND to an external power supply and perform a short-circuit test on the load circuit.

[0051] 3. Connect line 2 connected to DATA+ and line 3 connected to DATA- to the external power supply through the socket to perform a short-circuit test on the load circuit.

[0052] Example 4

[0053] Confirmation of switch status and impedance:

[0054] 1. Use an ohmmeter to measure the impedance of the switch in the normally open and normally closed states.

[0055] 2. Connect the two ends of the ohmmeter to port A and port B of the same circuit on the panel for measurement.

[0056] 3. When the switch is normally open, the DC impedance across port A and port B should be greater than 10MΩ.

[0057] 4. When the switch is in the normally closed state, the DC impedance across port A and port B should be less than 1μΩ.

Claims

1. An auxiliary device for electrical performance testing of motor vehicle parts, characterized in that: The invention comprises a housing (1), a circuit board (5) is arranged in the housing (1), a plurality of circuit groups are arranged on the circuit board (5), the circuit board (5) is connected to a port 1 (3) and a port 2 (4) respectively through a connecting line 1 (7) and a connecting line 2 (8), an operation panel (2) is arranged on the housing (1), each circuit group on the circuit board (5) is connected to a corresponding unit on the operation panel (2), and each unit group includes a port A, a port B, and a switch (C).

2. The auxiliary device for electrical performance testing of motor vehicle parts according to claim 1, characterized in that: The circuit board (5) is arranged in the housing (1) via a supporting structure (6).

3. The auxiliary device for electrical performance testing of motor vehicle parts according to claim 1, characterized in that: The housing (1) is a metal shielding housing.

4. The auxiliary device for electrical performance testing of motor vehicle parts according to claim 1, characterized in that: The port A and the port B are two embedded connection ports of the same circuit, which are distributed at both ends of the switch (C) and are connected to the external power supply line when in use.

5. The auxiliary device for electrical performance testing of motor vehicle parts according to claim 1, characterized in that: The switch (C) is a key switch or a signal trigger switch.

6. The auxiliary device for electrical performance testing of motor vehicle parts according to claim 1, characterized in that: The port one (3) and the port two (4) are signal connection ports, which are fixed protocol ports or integrated ports.

7. The auxiliary device for electrical performance testing of motor vehicle parts according to claim 6, characterized in that: The integrated ports include USB, Type C, RJ45, FGG / ECG, DB9, and LVDS.

8. The auxiliary device for electrical performance testing of motor vehicle parts according to claim 1, characterized in that: The circuit board (5) is a wiring board or a printed circuit board.

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