Detecting sensing lines of automotive wiring harness connection equipment

Automotive engine speed and synchronous sensors, intake manifold absolute pressure sensors, onboard atmospheric absolute pressure sensors, air temperature sensors, engine coolant sensors, fuel temperature sensors, oil temperature sensors, idle throttle position sensors, automatic transmission exhaust gas recirculation Valve sensor, air conditioning system speed sensor, fuel tank sensor, ignition coil control exhaust gas emission, control exhaust gas reflow, control air pump, control purifier, control engine cooling, fan control air conditioner, control interface idle speed, control interface fuel pump relay, control On-board computer interface tachometer drive.

When assembling or repairing auto parts, the metal object crushes the wire harness, causing the wire harness insulation layer to rupture; the wire harness position is improper; the lead position of the electrical equipment is connected incorrectly; the positive and negative poles of the battery are connected reversely; when the maintenance circuit is faulty, the messy connection is disordered. Cutting wires, etc., can cause abnormal operation of electrical equipment and even burn out the wiring harness.

The biggest problem with line inspection is that the fault finding process and method are not intuitive. The maintenance personnel can only diagnose the car wiring harness fault better by using simple and convenient methods.

For the choice of the color of the wire, it is preferred to use a single color, and then use two colors. In addition, in the wiring harness installation diagram of the automobile, the black wire of various automobile electrical appliances should be selected, and the black wire has no other use except for the grounding. At present, the domestic wire harness testing method is still relatively backward. The traditional on-site detection harness wiring method uses a multimeter, a buzzer or an indicator light to manually overlap by point, and observe whether there is any electric, acoustic or optical signal to judge each connecting line. On and off. In this way, the conduction detection is not only slow, low in efficiency, but also very easy to cause false detection or missed inspection, which cannot meet the requirements of the rapid development of current harness production and use. The internationally advanced automotive wire harness inspection plus quality control system has an impedance test function, but its price is relatively expensive, and many small wire harness manufacturers purchase such detection equipment. In order to ensure the quality and reliability of the wire harness, the development of the automotive wire harness detection system has a particularly important significance. At present, the wire harness detection system independently developed by the domestic automobile field is still basically blank. Through the analysis of the actual situation of the wire harness detection problem, the author puts forward a wire harness detection theory and method, and combines the microcomputer and the single chip to design a car wire harness detection system.

In an excessively dense and complex harness space, perhaps the above method cannot determine the specific location of the short-circuited portion. You can refer to the car wiring diagram and remove the trim for inspection. It can then be inspected with a short-circuit detector that helps at least determine the short-circuit position of the harness, avoiding the removal of all parts of the wall, making it easier to solve car breakdowns. External crosstalk is not only the root cause of the unshielded system, it is also one of the parameters that are highly valued in the field of field testing. Until now, the very hot question was "How long does it take for people to make the field test of the parameters reasonably implemented?" Indeed, some manufacturers have already proposed their initial plans, but they have not given comprehensive performance. Values, but only a certain evaluation of different channels, or just infer performance.

Automotive wiring harnesses use different colored conductors, reasonable conductor cross-sections, find the shortest distance between electrical connections, and use the shortest conductors. And install the connector on both ends of the wire. The wires are bundled into bundles, and different materials are used as the protective layer depending on the position of the wires. At the same time, fully consider the reliable grounding of electrical equipment. In addition, the wiring harness should be easy to assemble and disassemble and easy to maintain.