Low-voltage cable on-off detection control device for automobile

Abstract

The utility model discloses a low-voltage cable on-off detection control device for an automobile. The low-voltage cable on-off detection control device comprises a low-voltage storage battery, a light-emitting diode, a positive terminal and a negative terminal, wherein the cathode of the low-voltage storage battery is connected to the cathode terminal; the anode of the low-voltage storage battery is connected to the anode of the light-emitting diode, and the cathode of the light-emitting diode is connected to the positive terminal; and the positive terminal and the negative terminal are a plurality of different types of connecting terminals which are respectively and correspondingly used for connecting two ends of various types of low-voltage cables on the automobile. The utility model has the advantages that: simple circuit elements are adopted to realize the on-off detection of a line, and the parameter detection can be carried out on the on-off line by combining the resistance and the current, so that the use is simple and convenient; a plurality of interface forms are arranged, detection connection of various cables on an automobile is supported, and connection is convenient; the method is low in cost and convenient to implement, and can be used for large-scale detection.

Description

Technical Field

[0001] The utility model relates to the field of vehicle detection, in particular to a low-voltage cable on-off detection control circuit for vehicles. Background Art

[0002] When a vehicle leaves the factory, it needs to undergo factory inspection. The factory inspection will check various indicators of the vehicle, such as tire pressure, seats, audio and other equipment. For example, a pre-factory vehicle tire pressure detection system with the patent application number 202023079703.8 discloses a pre-factory vehicle tire pressure detection system, which includes a detection track, a friction wheel installed at a first predetermined position on the detection track, a tire pressure detection component, a vehicle carrier and a central control module; the driver of the friction wheel and the tire pressure detection component are respectively connected to the central control module; the vehicle carrier is used to carry the vehicle to be detected, has a friction guide member, is hung on the detection track, and drives the vehicle carrier to move forward or backward as the friction wheel rotates forward or backward; the tire pressure detection component is used to detect the detection data of the tire pressure sensor of the vehicle's tire and transmit it to the central control module. The detection system provided by the utility model installs a friction wheel on the detection track, and the friction wheel rotates forward or backward to drive the vehicle carrier forward or backward, and can repeatedly detect the same vehicle until the detection is successful, which is convenient and fast.

[0003] Factory inspection can quickly eliminate product quality problems. The communication detection of low-voltage cables is one of the inspections in factory inspection. The detection of low-voltage cables needs to be carried out before and after loading the vehicle. The commonly used detection methods in the prior art include:

[0004] At the front end of loading, a wire harness continuity detector or a continuity bench can be used to directly detect abnormal circuits in the low-voltage cables of the whole vehicle; at the back end of loading, a digital multimeter is used, and the multimeter is set to the ohm range or the diode and buzzer ranges. The change in the ohm value and the sound of the buzzer can detect the continuity of the cable. Both of these methods require professional equipment. Professional equipment is costly and there are many vehicle wire harnesses. If all are tested with professional equipment, a large number of professional equipment is required, which will increase the cost. When multiple tests are needed, the lack of equipment will cause untimely detection. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a low-voltage cable on-off detection control circuit for vehicles, which realizes the on-off detection of low-voltage cables with low cost through a simple structure.

[0006] To achieve the above object, the technical solution adopted by the utility model is as follows: A low-voltage cable on-off detection and control device for an automobile, comprising a low-voltage battery, a light-emitting diode, a positive terminal, and a negative terminal; wherein the negative electrode of the low-voltage battery is connected to the negative terminal; the positive electrode of the low-voltage battery is connected to the anode of the light-emitting diode, and the cathode of the light-emitting diode is connected to the positive terminal;

[0007] The positive terminal and the negative terminal are both multiple connection terminals with different types, respectively corresponding to the two ends of multiple types of low-voltage cables on the automobile for connection.

[0008] The multiple connection terminals with different types include alligator clips, probes, probes, and special connectors.

[0009] A current-limiting protection resistor R is connected in series in the circuit between the negative terminal and the positive terminal.

[0010] A current transformer is connected in series in the circuit between the negative terminal and the positive terminal, the output end of the current transformer is connected to a single-chip microcomputer, and the output end of the single-chip microcomputer is connected to a display module.

[0011] The display module is an LED display screen.

[0012] The electrical components of the control device are arranged on a PCB circuit board.

[0013] The advantages of the utility model are as follows: The detection of the line on-off can be realized by using simple circuit components, and the parameters of the on-off line can be detected in combination with resistance and current, which is simple and convenient to use; multiple interface forms are provided, supporting the detection connection of multiple cables on the automobile, and the connection is convenient; the cost is low, the implementation is convenient, and it can be used for mass detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The following briefly describes the content expressed in each drawing of the specification of the present invention and the marks in the drawings:

[0015] Figure 1 It is the structural schematic diagram of the control device of the utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following further describes the specific embodiments of the present invention in detail by describing the optimal embodiments with reference to the drawings.

[0017] This solution provides a proposed circuit that can detect the on-off of the vehicle circuit cable, which has a simple structure and can realize the on-off detection only with simple cables and electrical components, and has stronger adaptability; as Figure 1 shown, a low-voltage cable on-off detection and control device for an automobile, comprising a low-voltage battery, a light-emitting diode, a positive terminal, and a negative terminal;

[0018] The negative terminal of the low-voltage battery is connected to the negative extreme terminal; the positive terminal of the low-voltage battery is connected to the anode of the light-emitting diode D1, and the cathode of the light-emitting diode D1 is connected to the positive extreme terminal; the voltage of the low-voltage battery is very low, which can avoid potential safety hazards. In this solution, a No. 1 battery is used, and its voltage is generally about 1.5V. The positive terminal of the No. 1 battery is connected to the anode of the diode D1, the cathode of the diode D1 is connected to the positive extreme terminal; the negative terminal of the No. 1 battery is connected to the negative extreme terminal;

[0019] Since there are many types of vehicle wiring harnesses, for convenience and practicality, in this solution, both the positive extreme terminal and the negative extreme terminal are multiple connection terminals of different types, respectively corresponding to connecting the two ends of various types of low-voltage cables on the vehicle. That is, the multiple connection terminals of different types include alligator clips, probes, needles, special connectors, etc. By setting the positive extreme terminal and the negative extreme terminal as multiple types of connection terminals, the test requirements of different in-vehicle wiring harnesses can be met, and thus it can be used better and more conveniently.

[0020] At the same time, a current-limiting protection resistor R is connected in series between the anode of the diode D1 and the positive terminal of the No. 1 battery. The resistor prevents excessive current and protects the safe operation of the entire circuit. At the same time, since the on-off of the measured circuit of the vehicle can be evaluated by the lighting and extinguishing of the light-emitting diode D1, but sometimes, although the wiring harness is not disconnected, its resistance value is very large, resulting in the situation that although the light-emitting diode can be lit, there are still certain wiring harness fault problems. Therefore, a current transformer is connected in series in the circuit between the negative extreme terminal and the positive extreme terminal. The output terminal of the current transformer is connected to a single-chip microcomputer, and the output terminal of the single-chip microcomputer is connected to an LED display screen. The current in the circuit is collected by the current transformer. When the light-emitting diode is lit, the current parameters should also be judged. Only when both meet the requirements can it be judged that the vehicle wiring harness is normal, otherwise it is judged to be abnormal.

[0021] In this embodiment, the electrical components of the control device are arranged on the PCB circuit board, and only the negative extreme terminal and the positive extreme terminal are led out. When using for testing, only the positive extreme terminal and the negative extreme terminal need to be connected to the two ends of the corresponding wiring harness to quickly conduct the test. Its test principle includes:

[0022] Since this device is installed on the PCB board, only the positive terminal and the negative terminal are the movable ends. The positive terminal includes alligator clips, probes, pins, and special connectors. The negative terminal also includes alligator clips, probes, pins, special connectors, etc. Then, according to the interface characteristics at both ends of the wire harness to be measured, the types of the positive terminal and the negative terminal are selected. For example, if alligator clips are selected for both, the alligator clip of the positive terminal is attached to one end of the cable to be measured, and the alligator clip of the negative terminal is attached to the other end of the wire harness to be measured. Then, observe whether the light-emitting diode D1 is on. If it is not on, it means there is a disconnection fault in the wire harness to be measured. If the light-emitting diode is lit at this time, simultaneously check the current value displayed on the LED display. When the current value meets the set range, it is determined that the wire harness is normal; otherwise, if the current is abnormal, it is also determined that there is an abnormality in this cable to be measured. On this basis, the test of whether the cable to be measured is normal or not, and whether it is connected or disconnected can be completed.

[0023] In this solution, since the positive and negative connection terminals adopt various connection terminals such as alligator clips, probes, pins, and special connectors, it can be applied to the testing of different vehicle wire harnesses, improving the versatility of the equipment. The testing method is simple. The testing equipment can be directly connected to both ends of the wire harness to complete the test. The testing is accurate. As long as it is not on, it is determined that the wire harness is disconnected. Even if it is on, it is still necessary to judge whether the wire harness is correct according to the current acquisition data. If the current data is abnormal, it can also be determined that the wire harness is abnormal. Therefore, this solution can accurately judge whether the wire harness is normal or not.

[0024] Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A low-voltage cable on-off detection and control device for automobiles, characterized in that: It includes a low-voltage battery, a light-emitting diode, a positive terminal, and a negative terminal; among them, the negative electrode of the low-voltage battery is connected to the negative terminal; the positive electrode of the low-voltage battery is connected to the anode of the light-emitting diode, and the cathode of the light-emitting diode is connected to the positive terminal. The positive terminal and the negative terminal are both multiple connection terminals of different types, respectively corresponding to the two ends of multiple types of low-voltage cables used in the vehicle for connection.

2. The on-off detection and control device for low-voltage cables used in automobiles according to claim 1, characterized in that: The multiple connection terminals of different types include alligator clips, probes, needles, and special connectors.

3. The on-off detection and control device for low-voltage cables used in automobiles according to claim 1, characterized in that: A current-limiting protection resistor R is connected in series in the circuit between the negative terminal and the positive terminal.

4. A low-voltage cable on-off detection and control device for an automobile according to any one of claims 1-3, characterized in that: A current transformer is connected in series in the circuit between the negative terminal and the positive terminal. The output end of the current transformer is connected to a single-chip microcomputer, and the output end of the single-chip microcomputer is connected to a display module.

5. The on-off detection and control device for low-voltage cables used in automobiles according to claim 4, characterized in that: The display module is an LED display screen.

6. A low-voltage cable on-off detection and control device for an automobile according to any one of claims 1-3, characterized in that: The electrical components of the control device are arranged on a PCB circuit board.

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