A rapid short-circuit detection device for the internal wiring of an airbag controller

Abstract

This utility model discloses a rapid short-circuit location and detection device for the internal circuitry of an airbag controller, comprising an oscilloscope. The oscilloscope has an operation panel on its cross-section, an LCD screen fixedly mounted on the operation panel, and a light-shielding mechanism installed on the oscilloscope. The light-shielding mechanism includes a receiving groove on the top of the oscilloscope, a vertical slot at the end of the receiving groove, a light-shielding sheet covering the receiving groove, a side baffle fixedly mounted at the end of the light-shielding sheet, and a positioning seat fixedly connected to the bottom of the side baffle. This rapid short-circuit location and detection device for the internal circuitry of the airbag controller effectively blocks direct sunlight, reduces screen reflection and glare, improves visibility under strong outdoor light, and prevents the screen's contrast from decreasing under strong light, making it difficult to clearly observe waveforms; it also prevents misinterpretation of waveform details and improves the accuracy of the detection results.

Description

Technical Field

[0001] This utility model relates to the field of circuit testing, specifically a device for rapid location and detection of short circuits in the internal circuitry of an airbag controller. Background Technology

[0002] Rapidly locating and detecting short circuits in the internal wiring of an airbag controller requires specialized equipment. The following is a detailed explanation of commonly used testing equipment and its working principles: Common testing equipment and their locating principles are as follows:

[0003] 1. Dedicated automotive airbag testing instrument (diagnostic tool)

[0004] Equipment Function: Designed specifically for automotive airbag systems, it can read fault codes, simulate signal transmission, and locate circuit abnormalities; Working Principle: Connects to the airbag controller via OBD interface or dedicated wiring harness and sends diagnostic commands;

[0005] The device has a built-in database that compares the resistance and voltage parameters of a normal circuit. When a short circuit is detected, it will display a specific fault code (such as "resistance too low" or "short circuit to ground") and locate the corresponding circuit module (such as sensor circuit or detonator circuit). Some high-end devices support waveform analysis, which can monitor abnormal voltage fluctuations during signal transmission in real time and determine the location of the short circuit.

[0006] 2. Insulation resistance tester (megohmmeter)

[0007] Equipment Function: Used to detect whether the insulation layer of a line is damaged, causing a short circuit. It is suitable for checking the insulation of internal cables of a controller. Working Principle: Apply a DC high voltage (such as 500V or 1000V) to the line under test and measure the insulation resistance between the line and the grounding terminal. Under normal circumstances, the insulation resistance should be greater than 100MΩ. If a short circuit exists, the resistance value will drop sharply (usually less than 1MΩ), which can be used to determine whether the line is grounded or connected to other lines.

[0008] By performing segmented measurements (such as disconnecting the internal plug-in of the controller and testing the cable segment by segment), the short circuit range can be narrowed down.

[0009] 3. Oscilloscope

[0010] Equipment Function: Real-time monitoring of voltage waveforms in circuits to locate signal distortion caused by short circuits; Working Principle: Connecting oscilloscope probes to the signal input or output terminals of the controller circuit simulates signal transmission (such as triggering sensor signals); The waveform of a normal circuit should conform to preset standards (such as square waves or sine waves). If a short circuit exists, the waveform will show abnormalities such as "glitching," "amplitude reduction," or "grounding offset." The location of the short circuit point can be determined by the waveform characteristics (such as near the sensor terminal or the internal chip of the controller);

[0011] Taking an oscilloscope as an example, when quickly locating and testing whether there is a short circuit in the internal circuitry of an airbag controller, especially outdoors, direct sunlight on the oscilloscope causes screen reflection and glare, reducing screen contrast and making it difficult to clearly observe the waveform; it is easy to misjudge waveform details; and it reduces the accuracy of the test results. Utility Model Content

[0012] The purpose of this invention is to provide a device for rapid location and detection of short circuits in the internal circuitry of an airbag controller, in order to solve the defects mentioned in the background art.

[0013] To achieve the above objectives, a device for rapid location and detection of short circuits in the internal circuitry of an airbag controller is provided, comprising an oscilloscope. The cross-section of the oscilloscope is provided with an operation panel, an LCD screen is fixedly mounted on the operation panel, and a light-shielding mechanism is installed on the oscilloscope. The light-shielding mechanism includes a receiving groove formed on the top of the oscilloscope, a vertical slot formed at the end of the receiving groove, a light-shielding sheet covering the receiving groove, a side baffle fixedly mounted at the end of the light-shielding sheet, and a positioning seat fixedly connected to the bottom of the side baffle.

[0014] Preferably, the oscilloscope has a base fixedly installed on both sides of its bottom. The base is an isosceles trapezoidal structure made of plastic, and rubber pads are glued and fixed on both sides of the bottom of the base.

[0015] Preferably, the light-shielding mechanism includes a light-shielding sheet, a side baffle, a positioning seat, a limiting seat, a receiving groove, a vertical slot, a positioning hole, a limiting groove, a storage metal sheet, a light-shielding metal sheet, and a magnetic sheet, wherein the vertical slot is configured as two sets respectively opened on both sides of the receiving groove.

[0016] Preferably, the height of the receiving groove is equal to the thickness of the light-shielding sheet, and a limiting seat is fixedly provided on both sides of the bottom of the light-shielding sheet. A limiting groove is opened on both sides of the surface of the receiving groove. The dimensions of the limiting groove and the limiting seat are matched. The limiting seat is inserted into the inside of the limiting groove. The cross-section of the limiting groove and the limiting seat is set as an isosceles trapezoid.

[0017] Preferably, the bottom of the vertical slot is provided with a positioning hole, the light shield is U-shaped, the bottom of the light shield is fixedly connected to the positioning seat through a side baffle, the size of the positioning seat and the positioning hole are compatible, the positioning seat is inserted into the inside of the positioning hole, and the cross-section of the positioning seat and the positioning hole is gourd-shaped; the top of the light shield is provided with a rectangular force groove.

[0018] Preferably, the bottom of the limiting groove is uniformly provided with a storage metal sheet and a light-shielding metal sheet, and a magnet is fixedly provided inside the limiting seat. The storage metal sheet, the light-shielding metal sheet and the magnet are all circular and have the same diameter. The magnet is attracted and fixed to the storage metal sheet. The light-shielding sheet is stored inside the receiving groove. The magnet is attracted and fixed to the light-shielding metal sheet. The light-shielding sheet is extended to cover the outside of the LCD screen.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows: A rectangular groove is provided on the top of the handheld light shield, which can be pulled out from the inside of the receiving groove. At this time, the light shield covers the outside of the LCD screen, which can block the light and prevent glare on the LCD screen. The pull-out light shield structure realizes a fast and flexible light shielding and anti-glare function. The cooperation between the rectangular groove and the receiving groove allows the light shield to be smoothly pulled out or retracted from the inside of the housing, which saves space and facilitates one-handed operation. The light shield directly covers the outside of the LCD screen, effectively blocking direct sunlight, reducing screen reflection and glare, improving visibility under strong outdoor light, and preventing the screen's contrast from decreasing and making it difficult to clearly observe the waveform under strong light. It will not misjudge waveform details and improve the accuracy of the test results. Attached Figure Description

[0020] Figure 1 This is a front view schematic diagram of the structure of this utility model;

[0021] Figure 2 for Figure 1 Side view;

[0022] Figure 3 for Figure 1 Exploded view;

[0023] Figure 4 for Figure 3 Side view;

[0024] Figure 5 for Figure 4 A bottom view.

[0025] The following are the labels in the diagram: 1. Oscilloscope; 2. Operation panel; 3. Base; 4. LCD screen; 5. Light shielding mechanism; 51. Light shield; 52. Side baffle; 53. Positioning seat; 54. Limiting seat; 55. Receiving slot; 56. Vertical slot; 57. Positioning hole; 58. Limiting slot; 581. Storage metal sheet; 582. Light shielding metal sheet; 583. Magnet sheet. Detailed Implementation

[0026] Please see Figure 1-5This utility model provides a device for rapid location detection of short circuits in the internal circuit of an airbag controller, including an oscilloscope 1. The cross-section of the oscilloscope 1 is provided with an operation panel 2. An LCD screen 4 is fixedly installed on the operation panel 2. A light-shielding mechanism 5 is installed on the oscilloscope 1. The light-shielding mechanism 5 includes a receiving groove 55 opened on the top of the oscilloscope 1. A vertical slot 56 is opened at the end of the receiving groove 55. A light-shielding sheet 51 is covered on the receiving groove 55. A side baffle 52 is fixedly installed at the end of the light-shielding sheet 51. A positioning seat 53 is fixedly connected to the bottom of the side baffle 52.

[0027] Working principle: In actual use, when the oscilloscope 1 performs rapid short-circuit location detection on the internal circuitry of the airbag controller, the probe is connected to the signal input or output terminal to simulate the signal transmission process. The normal circuit waveform should meet the preset standard. If a short circuit exists, the waveform will show abnormalities such as spikes, amplitude reduction, or ground offset. The short circuit point can be located by observing the waveform characteristics, thus completing the purpose of short-circuit location detection. When the oscilloscope 1 is working outdoors, with direct sunlight shining on it, the top of the light shield 51 is held in a rectangular slot, allowing the light shield 51 to be pulled out from inside the receiving slot 55. At this time, the light shield 51 covers the outside of the LCD screen 4. It can shield the LCD screen 4 from light and prevent glare. The pull-out light shield 51 structure enables quick and flexible light shielding and anti-glare function. The cooperation between the rectangular slot and the receiving slot 55 allows the light shield 51 to be smoothly pulled out or retracted from the housing, which saves space and facilitates one-handed operation. The light shield 51 directly covers the outside of the LCD screen 4, effectively blocking direct sunlight, reducing screen reflection and glare, improving visibility under strong outdoor light, and preventing the screen from losing contrast and making it difficult to clearly observe waveforms under strong light. It will not misjudge waveform details and improve the accuracy of test results. At the same time, the overall structure is simple and does not interfere with other functional modules of the oscilloscope, taking into account portability and practicality.

[0028] When the light-shielding sheet 51 is pulled out of the receiving groove 55, the two sets of limiting seats 54 are slidably set inside the two sets of limiting grooves 58 respectively. At the same time, the two sets of side baffles 52 and positioning seats 53 are respectively inserted into the two sets of vertical slots 56 and positioning holes 57, which increases the friction of the light-shielding sheet 51 when it moves laterally and ensures the stability of the light-shielding sheet 51 when it is stationary. Meanwhile, the magnet 583 is attracted and fixed to the storage metal sheet 581, and the light-shielding sheet 51 is stored inside the receiving groove 55. The magnet 583 is attracted and fixed to the light-shielding metal sheet 582, and the light-shielding sheet 51 extends to cover the outside of the LCD screen 4, which can ensure that the light-shielding sheet 51 will not shake when it is stored or unfolded.

[0029] As a preferred embodiment, the oscilloscope 1 has a base 3 fixedly installed on both sides of its bottom. The base 3 is an isosceles trapezoidal structure made of plastic, and rubber pads are glued and fixed on both sides of the bottom of the base 3.

[0030] In a preferred embodiment, the light-shielding mechanism 5 includes a light-shielding sheet 51, a side baffle 52, a positioning seat 53, a limiting seat 54, a receiving groove 55, a vertical slot 56, a positioning hole 57, a limiting groove 58, a storage metal sheet 581, a light-shielding metal sheet 582, and a magnetic sheet 583. The vertical slot 56 is configured as two sets, which are respectively opened on both sides of the receiving groove 55.

[0031] In a preferred embodiment, the height of the receiving groove 55 is equal to the thickness of the light-shielding sheet 51. Limiting seats 54 are fixedly provided on both sides of the bottom of the light-shielding sheet 51. Limiting grooves 58 are provided on both sides of the surface of the receiving groove 55. The dimensions of the limiting grooves 58 and the limiting seats 54 are matched. The limiting seats 54 are inserted into the inside of the limiting grooves 58. The cross-sections of the limiting grooves 58 and the limiting seats 54 are set as isosceles trapezoids.

[0032] In a preferred embodiment, the bottom of the vertical slot 56 is provided with a positioning hole 57, the light shield 51 is U-shaped, and the bottom of the light shield 51 is fixedly connected to the positioning seat 53 through the side baffle 52. The size of the positioning seat 53 and the positioning hole 57 are matched, and the positioning seat 53 is inserted into the inside of the positioning hole 57. The cross-section of the positioning seat 53 and the positioning hole 57 is gourd-shaped. The top of the light shield 51 is provided with a rectangular force groove.

[0033] In a preferred embodiment, a storage metal sheet 581 and a light-shielding metal sheet 582 are evenly arranged at the bottom of the limiting groove 58. A magnet 583 is fixedly arranged inside the limiting seat 54. The storage metal sheet 581, the light-shielding metal sheet 582, and the magnet 583 are all circular and have the same diameter. The magnet 583 is attracted and fixed to the storage metal sheet 581. The light-shielding sheet 51 is stored inside the receiving groove 55. The magnet 583 is attracted and fixed to the light-shielding metal sheet 582. The light-shielding sheet 51 extends to cover the outside of the LCD screen 4.

Claims

1. A device for rapid location detection of short circuits in the internal circuitry of an airbag controller, comprising an oscilloscope (1), characterized in that: The oscilloscope (1) has an operation panel (2) on its cross section. An LCD screen (4) is fixedly installed on the operation panel (2). A light shielding mechanism (5) is installed on the oscilloscope (1). The light shielding mechanism (5) includes a receiving groove (55) opened on the top of the oscilloscope (1). A vertical slot (56) is opened at the end of the receiving groove (55). A light shielding sheet (51) is covered on the receiving groove (55). A side baffle (52) is fixedly installed at the end of the light shielding sheet (51). A positioning seat (53) is fixedly connected to the bottom of the side baffle (52).

2. The short-circuit rapid positioning and detection device for the internal circuit of an airbag controller according to claim 1, characterized in that: The oscilloscope (1) has a base (3) fixedly installed on both sides of its bottom. The base (3) is an isosceles trapezoidal structure made of plastic material. Rubber pads are glued and fixed on both sides of the bottom of the base (3).

3. The short-circuit rapid positioning and detection device for the internal circuit of an airbag controller according to claim 1, characterized in that: The light-shielding mechanism (5) includes a light-shielding sheet (51), a side baffle (52), a positioning seat (53), a limiting seat (54), a receiving groove (55), a vertical slot (56), a positioning hole (57), a limiting groove (58), a storage metal sheet (581), a light-shielding metal sheet (582), and a magnetic sheet (583). The vertical slot (56) is configured as two sets, which are respectively opened on both sides of the receiving groove (55).

4. The rapid short-circuit detection device for the internal circuit of an airbag controller according to claim 3, characterized in that: The height of the receiving groove (55) is equal to the thickness of the light-shielding sheet (51). Limiting seats (54) are fixedly provided on both sides of the bottom of the light-shielding sheet (51). Limiting grooves (58) are opened on both sides of the surface of the receiving groove (55). The dimensions of the limiting groove (58) and the limiting seat (54) are matched. The limiting seat (54) is inserted into the inside of the limiting groove (58). The cross-section of the limiting groove (58) and the limiting seat (54) is an isosceles trapezoid.

5. The short-circuit rapid positioning and detection device for the internal circuit of an airbag controller according to claim 3, characterized in that: The bottom of the vertical slot (56) is provided with a positioning hole (57), the light shield (51) is U-shaped, the bottom of the light shield (51) is fixedly connected to the positioning seat (53) through the side baffle (52), the size of the positioning seat (53) and the positioning hole (57) are matched, the positioning seat (53) is inserted into the inside of the positioning hole (57), the cross section of the positioning seat (53) and the positioning hole (57) is gourd-shaped; the top of the light shield (51) is provided with a rectangular force groove.

6. The short-circuit rapid positioning and detection device for the internal circuit of an airbag controller according to claim 4, characterized in that: The bottom of the limiting groove (58) is uniformly provided with a storage metal sheet (581) and a light-shielding metal sheet (582). A magnet sheet (583) is fixedly provided inside the limiting seat (54). The storage metal sheet (581), the light-shielding metal sheet (582) and the magnet sheet (583) are all circular. The diameters of the storage metal sheet (581), the light-shielding metal sheet (582) and the magnet sheet (583) are the same. The magnet sheet (583) is attracted and fixed to the storage metal sheet (581). The light-shielding sheet (51) is stored inside the receiving groove (55). The magnet sheet (583) is attracted and fixed to the light-shielding metal sheet (582). The light-shielding sheet (51) is extended to cover the outside of the LCD screen (4).

Images