Automobile line fault detector
By designing an automotive wiring fault detector, and utilizing multi-position switches and signal prompts, the problem of time-consuming and labor-intensive automotive wiring fault detection in existing technologies has been solved, achieving fast and convenient multi-functional fault identification.
Patent Information
- Application Number
- CN202520000905.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-02
AI Technical Summary
Existing technologies for detecting automotive wiring faults are time-consuming, labor-intensive, and not intuitive, making it difficult to quickly distinguish between short circuits and open circuits, especially positive short circuits, negative short circuits, open circuits, and loose connections.
An automotive wiring fault detector was designed, comprising a power supply, a signal device, and a switch. The detector can switch between detection modes via a multi-position switch, and the fault type can be indicated by a signal light or a buzzer, simplifying the operation process and displaying the fault type intuitively.
It achieves multi-functional detection, can quickly identify positive short circuit, negative short circuit, open circuit and loose connection faults in automotive circuits, is easy to operate, reduces the difficulty of judgment for testers, and improves testing efficiency.
Smart Images
Figure CN223842097U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automotive electronic control wiring harness testing, specifically to an automotive wiring fault detector. Background Technology
[0002] Modern cars have increasingly complex functions and wiring, leading to a significant increase in the likelihood of malfunctions. Wiring faults can generally be categorized into short circuits and open circuits. Short circuits can be further divided into positive and negative short circuits, while open circuits can be categorized into loose connections and open circuits in a narrow sense. Each type of fault can frequently cause corresponding vehicle malfunctions, and in severe cases, it can lead to engine stalling or even safety system failures resulting in traffic accidents. Therefore, quickly locating automotive wiring faults is an urgent problem to solve. However, current technologies for detecting short circuits and open circuits in automotive wiring mostly rely on measuring each circuit individually with a multimeter, judging the resistance and voltage values. This detection method is not intuitive or convenient, and requires individual measurement and judgment, making it difficult to operate and time-consuming. Utility Model Content
[0003] This utility model provides an automotive circuit fault detector in order to solve the above-mentioned technical problems.
[0004] An automotive wiring fault detector includes a power supply, a first signal device, a second signal device, a third signal device, a transistor, a switch, a first connector, a second connector, and a third connector. The negative terminal of the power supply is connected to the first signal device, and its positive terminal is connected to the second signal device. The switch is a multi-position switch that can be connected in series with the first and second signal devices and then connected to the first connector. The third connector is connected to the positive terminal of the power supply. The second connector is connected in series with the transistor and the third signal device and then connected to the positive terminal of the power supply. The transistor is an NPN type, with its base connected to the second connector, its collector connected to the third signal device, and its emitter grounded.
[0005] Furthermore, the first signal device is connected to the negative terminal of the power supply via a negative connector, and the second signal device is connected to the positive terminal of the power supply via a positive connector.
[0006] Furthermore, the first signal device, the second signal device, and the third signal device are all signal lights.
[0007] The beneficial effects of this utility model are: 1. Multifunctional detection: It can detect positive short circuit, negative short circuit, open circuit and loose connection faults in automotive circuits, and is suitable for various fault diagnosis needs.
[0008] 2. Easy to operate: Different detection modes can be switched by switching the switch, the connection line is simple and easy for testing personnel to use.
[0009] 3. Visual indication: The signal device has markings or colors to indicate the type of fault, reducing the difficulty of judgment for testing personnel and improving testing efficiency. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the circuit structure of this utility model;
[0011] Figure 2 This is a schematic diagram of the circuit structure for detecting a negative short circuit according to this utility model;
[0012] Figure 3 This is a schematic diagram of the circuit structure for detecting a short circuit at the positive terminal according to this utility model;
[0013] Figure 4 This is a schematic diagram of the circuit structure for determining whether the tested circuit is open or loosely connected according to the present invention.
[0014] Figure 5 This is a schematic diagram of the circuit structure for detecting open circuits and loose connections according to this utility model.
[0015] The diagram shows: 1. Box; 2. Power supply; 3. First signal device; 4. Second signal device; 5. Third signal device; 6. Transistor; 7. Circuit under test; 8. Switch; 9. First connector; 10. Second connector; 11. Third connector; 12. Negative connector; 13. Positive connector. Detailed Implementation
[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0017] like Figure 1 As shown, an automotive wiring fault detector includes a first signal device 3, a second signal device 4, a third signal device 5, a transistor 6, a switch 8, a first connector 9, a second connector 10, and a third connector 11. The first signal device 3 is connected to a negative connector 12, and the second signal device 4 is connected to a positive connector 13. The switch 8 is a multi-position switch that can be connected in series with the first signal device 3 and the second signal device 4 and then connected to the first connector 9.
[0018] The third connector 11 is connected to the positive connector 13, and the second connector 10 is connected in series with the transistor 6 and the third signal device 5 and then connected to the positive connector 13.
[0019] Transistor 6 is an NPN type, with its base connected to the second connector 10, its collector connected to the third signal device 5, and its emitter grounded.
[0020] The first signal device 3, the second signal device 4, and the third signal device 5 are alarm indication devices, which may be signal lights, buzzers, audible and visual alarms, or other devices with alarm indication functions.
[0021] Labels can also be affixed to the positions of the first signal device 3, the second signal device 4, and the third signal device 5. For example, labels such as "positive short circuit," "negative short circuit," and "loose connection" can be affixed to the positions of the first signal device 3, the second signal device 4, and the third signal device 5, respectively, to provide intuitive and convenient guidance to the testing personnel. Alternatively, the first signal device 3, the second signal device 4, and the third signal device 5 can be painted with different colors for easy identification.
[0022] Detection principle:
[0023] Detecting a short circuit at the negative terminal of the circuit:
[0024] In modern automotive technology, most systems use a negative ground connection, connecting the negative terminal of the power supply to the vehicle frame. This makes the frame negatively charged, allowing all automotive electrical equipment mounted on the frame to form a circuit with only a single wire leading from the positive terminal of the power supply. Grounding fault: In automotive electrical wiring, a non-grounded wire (or terminal) directly contacts the vehicle frame, causing a negative short circuit at that point.
[0025] like Figure 2 As shown, when using this utility model to detect a negative short circuit, connect the positive connector 13 to the positive terminal of the power supply 2, connect one end of the circuit under test 7 to the first connector 9, and adjust the position of the switch 8 to be connected in series with the second signal device 4. If the second signal device 4 issues an alarm indication, it indicates that a grounding fault has occurred at some point in the circuit under test 7, forming a circuit, and the fault phenomenon is a negative short circuit.
[0026] Detection of a short circuit at the positive terminal of the circuit:
[0027] like Figure 3 As shown, when using this utility model to detect a positive short circuit, connect the negative plug 12 to the negative terminal of the power supply 2, connect one end of the circuit under test 7 to the first plug 9, and adjust the position of the switch 8 to be connected in series with the first signal device 3. If the first signal device 3 issues an alarm indication, it indicates that a positive short circuit has occurred at some point in the circuit under test 7, forming a loop.
[0028] Detect open circuits or loose connections in the wiring:
[0029] In short-circuit testing of a line, if there is neither a positive nor a negative short circuit, the line is checked for open circuits or loose connections. Figure 4As shown, connect the positive terminal 13 and the negative terminal 12 to the positive and negative terminals of the power supply 2, respectively. Connect one end of the circuit under test 7 to the first terminal 9 and the other end to the third terminal 11. Set the switch 8 to be connected in series with the first signal device 3. If the first signal device 3 alarms normally, it means that the circuit under test 7 is normal and there is no open circuit or loose connection. If the first signal device 3 does not issue an alarm indication, it means that the circuit under test 7 is open circuit or has a serious loose connection (its resistance value is large) and no power circuit is formed.
[0030] If the first signal device 3 does not issue an alarm indication normally, it is necessary to further confirm whether the tested line 7 is open-circuited or has a loose connection. Figure 5 As shown, disconnect one end of the test line 7 from the first connector 9 and connect it to the second connector 10. The other end of the test line 7 remains connected to the third connector 11. If the test line 7 is open-circuited, the third signal device 5 will not issue an alarm indication because no loop is formed. If the test line 7 is loosely connected, due to the presence of the transistor 6, its base is triggered, and the collector and emitter are connected. The third signal device 5 will issue a normal alarm indication, indicating that the test line 7 is loosely connected.
[0031] When confirming whether the tested line 7 is open or loose, a switch can be installed on the line connecting the third connector 11 to the positive connector 13. When the two ends of the tested line 7 are connected to the second connector 10 and the third connector 11 respectively, the third signal device 5 will not immediately issue an alarm indication because the switch is not yet closed and a circuit cannot be formed. Only when the switch is closed will an alarm indication be issued if the tested line 7 is loosely connected. In this way, one will not be startled by a sudden alarm indication when plugging in the circuit, and it is safer.
[0032] Therefore, this utility model can be used to detect fault phenomena such as positive short circuit, negative short circuit, open circuit and loose connection of the circuit under test 7.
[0033] This utility model is not limited to the above-described preferred embodiments. Any other products that are the same as or similar to this utility model and derived by anyone under the guidance of this utility model shall fall within the protection scope of this utility model.
Claims
1. A vehicle wiring fault detector, characterized in that, The device includes a first signal device (3), a second signal device (4), a third signal device (5), a transistor (6), a switching switch (8), a first connector (9), a second connector (10), and a third connector (11). The first signal device (3) is connected to a negative connector (12), and the second signal device (4) is connected to a positive connector (13). The switching switch (8) is a multi-position switch that can be connected in series with the first signal device (3) and the second signal device (4) to the first connector (9). The third connector (11) is connected to the positive connector (13). The second connector (10) is connected in series with the transistor (6) and the third signal device (5) to the positive connector (13). The transistor (6) is an NPN type, with its base connected to the second connector (10), its collector connected to the third signal device (5), and its emitter grounded.
2. The automotive wiring fault detector according to claim 1, characterized in that, The first signal device (3), the second signal device (4), and the third signal device (5) are all signal lights.
3. The automotive wiring fault detector according to claim 1, characterized in that, A switch is provided on the line connecting the third connector (11) to the positive connector (13).