Characteristic test of automobile wiring harness

The automobile wiring harness is the main body of the automobile circuit, and there is no automobile circuit without the wiring harness. Wiring harness refers to the contact terminal (connector) made of copper material and crimped with wire and cable, and then plastic pressure insulator or metal shell is added to the outside to form a connected circuit assembly. The wiring harness industry chain includes wire and cable, connectors, processing equipment, wiring harness manufacturing and downstream application industries. The wiring harness is widely used and can be used in automobiles, household appliances, computers and communication equipment, various electronic instruments and meters, etc. The body wiring harness connects the entire body , The general shape is H-shaped. At present, automobiles have become an indispensable transportation tool in people's daily work. Now with the gradual improvement of the electrification and intelligence of automobiles, the number of wiring harnesses is increasing. Although the bus technology is widely used in modern automobiles, the number of wires and connectors is further reduced, the huge wiring harness system is simplified, and the lightweight level of the wiring harness is improved. However, the wiring harness is the basic network body of the automobile circuit and is used in the automobile electrical system. The status is still irreplaceable. Automobile wiring harnesses are distributed in various corners of the car and can be divided into cab wiring harness, chassis wiring harness and engine wiring harness according to the main structure. Among them, the door wiring harness in the cab works under repeated expansion and contraction for a long time; the chassis wiring harness works for a long time under high and low temperature and mud immersion environment; the engine wiring harness works under high temperature and high oil environment most of the time, and must be undertaken at the moment of engine start The impact of transient current. If the automobile wiring harness cannot adapt to work in these extreme environments, it will inevitably lead to fires, short circuits, corrosion and aging, etc., which will directly affect the safety of the car and cause accidents. In order to ensure the safety of the car, it is particularly important to test and verify the wiring harness of the car. Automotive wiring harness standards mainly include QCn29005-1990 'Quality Classification of Low-Voltage Wire Harnesses for AutomobilesIn terms of wire harness testing, domestic standards mainly follow the QC/T29106-2014 standard, but this set of standards has many shortcomings in electrical performance testing: Among them, for the contact voltage drop test in electrical performance testing, the methods mentioned in the standard are used in actual testing. This method is not applicable because the method requires more test equipment and needs to be measured after thermal equilibrium; and the durability characteristic test is not mentioned in the standard. In view of the shortcomings of the standard CLP performance test in these two test items, based on the QC/T29106-2014 standard, a new durability characteristic test and contact voltage drop test method are proposed in this article, and these two test methods are carried out. Test verification.