Poor connection of the core leads to an increase in contact resistance, which causes the wire harness to heat up, causing insulation aging, cracking, and short circuit. The quality of the connection is strictly required during the operation. Aluminum wire crimping. Before the crimping, remove the aluminum oxide from the inner core of the wire core and the aluminum connecting pipe by applying a layer of neutral petroleum jelly on the inner core of the wire core and the aluminum connecting pipe, brushing the aluminum oxide film with a steel wire brush, wiping off the aluminum filings and then coating the inner layer. For the Vase strain, insert the aluminum core into the aluminum joint for crimping. The copper core wire is crimped, and as long as the copper crimping tube is tinned during the crimping, the surface of the copper core can be rusted.
In the automotive design phase, engineers need a complete set of test tools to perform in-depth analysis of complex automotive wiring harness bus systems to gain a clear understanding of what is happening on the bus.
Although the development trend of automotive wiring harness technology is multiplex technology, circuit control system, central electrical box integration, and synchronous design technology, the inline process design based on traditional electric wires is still widely used. Etc. introduced a method of automotive wiring harness design. Wei Linhong made a preliminary attempt in computer-aided design of wire harness production in the literature but did not involve inline process design. No car wiring harness assisting software completed the above inline automatically or semi-automatically. Process design process. There are a large number of constraint layout problems in the project. Many researchers have studied it, and automatically generating inline process cards is also a constraint layout problem.
In the past, the manual management form was mainly used in the production of automotive wiring harnesses, which was not conducive to the effective connection of various production links, and was not conducive to the re-arrangement of adjustments according to actual conditions.
Each network point has a transceiver on the network card. When the destination address sent by the sending network point matches the interface address of a certain network point, the network point receives the information. The advantage of the automobile wiring harness form structure is that it is easy to install, easy to expand, and has high reliability. A certain network point is damaged and does not affect the entire network work. However, since two buses are shared, it is necessary to solve the collision of two network points simultaneously transmitting information to one network point. The problem, this is not suitable for systems with high real-time requirements.
With the development of automotive mechatronics technology, the level of onboard MEMS control and accuracy has been continuously improved, and a large number of high-tech devices, such as microcomputer integrated control, multimedia audio and video, vehicle mobile communication, satellite navigation, etc., have been added to enable in-vehicle electronic devices. As the quantity and quality increase, the diameter of the wire harness of the automobile becomes thicker, the amount of information and precision of transportation increases, and the connection of the wire harness becomes complicated.
The wire harness in the automobile circuit is a wire bundle that connects the power source, the switch, and the electric equipment distributed in various parts of the car into an organic whole according to the functions and circuit principles of each part. In the process of using the car, the wiring harness of the circuit is inevitably contaminated with dust and oil. Loose oxidation occurs between the contacts, and some parts wear out the insulation or even leak or short circuit, which will ablate the wire harness seriously. In the maintenance and repair of the car, it is necessary to fully note that before removing the harness assembly, it is best to follow the circuit diagram, disassemble and record for inspection and restoration. The main content of the record is the terminal code and mark, which wire is connected to this terminal, the color of the wire, the mark. What is the cross-sectional area of the copper core of the wire and the shape of the joint of the wire? There are several large branches on the harness, how many wires are on each branch, what the color of the wires is and what the stripes are. The total length of the wire harness is how many millimeters, how many millimeters each branch is, and how many millimeters between the two branches.
It is necessary to carry out safety tests on samples by making large quantities of wire harness intermediate heat shrinkable wire bundle boxes. The data obtained by testing the wire harness for pressure, partial discharge, and load operation are important conditions for providing theoretical data for the use of high voltage wire bundle heat shrinking technology.
The detection system is divided into two parts: continuity detection and insulation resistance detection. On-off detection can test open circuit, short circuit, multiple connections, misconnection and poor contact of automobile wiring harness; insulation resistance detection can measure the insulation degree of each wire harness and each wire harness in the connector. When the harness is detected, the number of the test line and the result of the test should be displayed immediately so that the operator can find and eliminate the fault in time.
Visual inspection is required before replacement. The new automobile harness type should be the same as the original model, and the wire terminals and the wires are connected reliably. You can pull the connectors and wires to loosen or fall off. Compare the new harness with the original harness, such as the size of the harness, wire terminal fittings, wire color, etc. should be basically the same. For doubts, use a multimeter to test and confirm that the harness is intact before it can be replaced.