Basic Knowledge of Automotive Wiring Harness

The automotive wiring harness is the main body of the automobile circuit network and has an indispensable important position in the entire structure of the automobile. Some people compare car wiring harness to the nerves and blood vessels of a car. How much do you know about the basic common sense of car wiring harness?

What is automotive wiring harness?

The automotive wiring harness is the main body of the automobile circuit, and there is no automobile circuit without the wiring harness. At present, whether it is a high-end luxury car or an economical ordinary car, the form of wire harness braiding is basically the same, which is composed of wires, connectors, and wrapping tape.

What are the common specifications of automotive wiring harnesses?

Common specifications of wires in automotive wiring harnesses include wires of square millimeters, such as nominal sectional area 0.5, 0.75, 1.0, 1.5, 2.0, 2.5, 4.0, 6.0, etc., each of which has allowable load current value and is matched with wires for electrical equipment of different power.

What are the requirements for materials for automotive wiring harnesses?

The material requirements for automotive wiring harnesses are also very strict. Including its electrical performance, material emission, temperature resistance, etc., all have higher requirements than general wiring harnesses, especially those related to safety: wiring harnesses for important components such as direction control systems and brakes have stricter requirements.

What is the function of automotive wiring harness?

Automotive wiring harnesses are divided into functions, there are two types of power lines that carry power to drive the actuators (actuators) and signal lines that transmit sensor input commands.

Power lines are thick wires that carry large currents, while signal lines are thin wires that do not carry power (optical fiber communication); for example, the cross-sectional area of wires for signal circuits is 0.3 or 0.5 mm2.　　

The cross-sectional area of wires used in motors and actuators is 0.85 and 1.25mm2, while the cross-sectional areas of wires used in power circuits are 2, 3, and 5mm2; while special circuits (starters, alternators, engine ground wires, etc.) have 8, 10, 15, 20mm2 different specifications.

The larger the cross-sectional area of the wire, the larger the current capacity. In addition to considering the electrical performance, the selection of the wire is also restricted by the physical performance of the vehicle, so it has a wide range of options. For example, the frequently opened/closed door of a taxi, and the wires that span the body should be made of wires with good flexibility. Wires used in high-temperature areas generally use vinyl chloride and polyethylene-coated wires with good insulation and heat resistance. In recent years, electromagnetic shielding wires used in weak signal circuits have also been increasing.　　

With the increase of automobile functions and the widespread application of electronic control technology, there will be more and more electrical components and more and more wires. The number of circuits and power consumption on automobiles has increased significantly, and the wiring harness has become thicker and heavier. . This is a big problem that needs to be solved. How to arrange a large number of wire harness more effectively and rationally in the limited automotive space, and how to make the automotive wire harness play a greater role will be a new trend for the automotive wire harness manufacturers to carry out technical research and innovation in the future.

The above information is provided by the wire harness supplier.