Analysis on the design process and reliability of automotive wiring harness

The car harness planning is based on the layout of the car plastic parts structure, and then the whole car wiring. It is divided into wire selection, color selection, terminal selection, sheath selection, etc. Reasonable selection ultimately determines a reasonable wiring harness. After the planning of the car wiring harness system, data saving, the purpose of convenient disassembly and maintenance and beautiful layout. The following is a discussion on the car harness planning process and its reliability.
1 Analysis of car wiring harness planning criteria
Car wiring harness planning plays an important role in realizing car functions and car driving safety. Therefore, it is necessary for planners in the car wiring harness planning process to follow relevant guidelines. For example, in the process of wire selection, the wires with matching colors should be selected, and the wires with matching colors can prevent the identification of faults to a certain extent. The selection of cross-sectional area must be appropriate. It is necessary to select the shortest interval for connection when connecting wires. After all, the wires are installed at both ends of the connector.

2 Analysis of the planning process of car wiring harness
The whole process of car wiring harness is: first confirm all the electrical functions of the car, and the relevant planners draw the electrical schematic diagram after grasping the electrical functions of the car, based on this, carry out the primary planning of car wiring harness in the schematic diagram.
In the process of car harness planning, it is necessary to pay attention to the selection of wires, terminals, and joints. After the car harness planning is basically completed, conduct all-round experiments and inspections on the reliability of the car. If the inspection can reach the relevant specifications, it will begin to improve the car harness planning scheme. If the inspection results do not meet the relevant specifications, it is necessary to start planning the car harness again and start again.
Experiments and inspections of reliability.
3 Analysis of the reliability of car wiring harness planning
3.1 Strictly Confirm Wire Harness Length
Cars generally confirm the length of each part of the wire harness according to the practical placement position of the electrical appliances on the body, and all the places passed by the wire harness have fixed ties or holes to fix the wire harness. Therefore, the reliability of the harness is also greatly affected by the size of each branch on the harness assembly. If the wiring harness is too long, it will not only waste space and data, but also simply cause friction due to contact with other parts during the driving of the vehicle, which accelerates the wear of the wiring harness, thereby causing short circuit and other problems; If the wire harness is too short, it will add the difficulty of its distribution, and even cannot be installed. Sometimes the wire harness is only a little short, the operator thinks that it is enough to tighten the wire with force, but this has left a very big hidden danger to the safety of the wire harness in practice, which simply causes the loosening of the single matching point and the terminal, the terminal is loose from the sheath, and the connection is not reliable. Therefore, the planned length of the harness must be longer than the practical length.
There is a slight surplus, and the generally appropriate redundancy is 3-5%.