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With the increase of vehicle functions and the universal application of electronic control technology, more and more electrical components and wires will be used, and the number of circuits and power consumption on vehicles will increase significantly, Automotive wiring harnessIt will become thicker and heavier, which is an urgent need to solve. How to make a large number of wire harnesses more effectively and reasonably arranged in the limited car space, so that the car wire harness can play a greater role, has become a problem faced by the automobile manufacturing industry.
So what is the function of car harness in cars?

Car harness is the main body of the network of car circuits. It connects the electrical and electronic components of the car and makes them function. Without harness, there is no car circuit. At present, whether it is an advanced luxury car or an economical ordinary car, the wiring harness is basically the same in form. It is composed of wires, connectors and wrapping tape. It should not only ensure the transmission of electrical signals, but also ensure the reliability of the connecting circuit, supply the specified current value to the electronic and electrical components, prevent electromagnetic interference to the surrounding circuits, and eliminate the electrical short circuit.

In terms of function, the car harness can be divided into two types: the power line that carries the power of the driving actuating element (actuator) and the signal line that transmits the input command of the sensor. Power lines are thick wires that carry large current, while signal lines are thin wires that do not carry electricity (optical fiber communication); For example, the sectional area of wires used for signal circuits is 0.3 and 0.5mm2.

The sectional area of wires for motors and actuators is 0.85 and 1.25mm2, while the sectional area of wires for power circuits is 2, 3 and 5mm2; However, special circuits (starter, alternator, etc.) have different specifications of 8, 10, 15 and 20mm2. The larger the cross-sectional area of the wire, the greater the current capacity. In addition to considering the electrical performance, the selection of wires is also restricted by the physical performance of the vehicle, so its selection range is very wide. For example, the wire between the frequently opened/closed door and the crossing body on the taxi should be composed of wires with good flexibility. Conductors used at high temperature locations generally use vinyl chloride and polyethylene coated conductors with good insulation and heat resistance. In recent years, the number of electromagnetic shielding wires used in weak signal circuits has also increased.

The above is the function of automobile wire harness introduced by Robust Electronics.