Automotive Wiring Harness

Automotive wiring harness is the main body of the network of automotive circuits, there is no wiring harness there is no automotive circuits. Harness refers to the copper punching and into the contact parts of the terminal (connector) and wire and cable crimping, and then outside the plastic pressure insulator or external metal shell, etc., to wire harness bundled to form a connection circuit components. Harness industry chain, including wire and cable, connectors, processing equipment, harness manufacturing and downstream application industry, harness applications are very wide, available in automobiles, household appliances, computers and communications equipment, a variety of electronic instruments and meters, etc., the body harness connects the entire body, the general shape of the H-shape.

Basic introduction to automotive wiring harnesses

Automotive wires, also known as low-voltage wires, it is different from ordinary household wires. Ordinary household wires are copper single-piston wires, with a certain degree of hardness. And car wires are copper multi-pistil wire, some soft wire as thin as a hair, several or even dozens of soft copper wire wrapped in plastic insulation tube (PVC), soft and not easy to break.

Due to the special nature of the automotive industry, the manufacturing process of automotive wiring harnesses is more special than other common wiring harnesses.

The system for manufacturing automotive wiring harnesses is roughly divided into two categories:

1. Divided by Europe and the United States, including China:

Use the TS16949 system to control the manufacturing process.

2. Japan-based:

Such as Toyota, Honda they have their own system to control the manufacturing process.

With the increase of automobile functions and the universal application of electronic control technology, there are more and more electrical parts, more and more wires, and the wiring harness becomes thicker and heavier. Therefore advanced automobiles have introduced CAN bus configurations that utilize a multiplexed transmission system. Compared with traditional wiring harnesses, the multiplexing device greatly reduces the number of wires and interconnections, making wiring easier.

Introduction to the function of automotive wiring harnesses

In modern cars, automotive wiring harnesses in particular, electronic control systems and wiring harnesses have a close relationship. Some people have played an image of the metaphor: if the microcomputer, sensors and the function of the executive element with the human body to the analogy, it can be said that the microcomputer is equivalent to the human brain, the sensor is equivalent to the sensory organs, the executive element is equivalent to the organ of the movement, then the wiring harness is the nerves and blood vessels.

Automotive wiring harness is the main body of the network of automotive circuits, connecting the electrical and electronic components of the car and make it function, there is no wiring harness there is no automotive circuit. At present, whether it is a high-level luxury cars or economic ordinary cars, the wiring harness is basically the same form, are composed of wires, plug-ins and wrapping tape, which should ensure that the transmission of electrical signals, but also to ensure the reliability of the connection circuit, to the supply of electrical and electronic components of the specified current value, to prevent electromagnetic interference on the surrounding circuits, and to exclude electrical short circuits.

Automotive wiring harness from the function to points, there are carrying drive the executive element (actuator) power line and the transmission of sensor input instructions signal line two kinds. Power line is a thick wire to transport large currents, while the signal line is not carrying power of the thin wire (optical fiber communication); for example, the signal circuit with a wire cross-sectional area of 0.3, 0.5mm2.

In the motor, the actuator with a wire cross-sectional area of 0.85, 1.25mm2, while the power circuit with a wire cross-sectional area of 2, 3, 5mm2; and the special circuits (starter motor, alternator, engine grounding wire, etc.), and the power circuit (starter motor, alternator, engine grounding wire, etc.). Special circuits (starter, alternator, engine ground wire, etc.) are 8, 10, 15, 20mm2 different specifications. The larger the cross-sectional area of the wire, the larger the current capacity. Wire selection, in addition to considering the electrical properties, but also by the vehicle when the physical properties of the constraints, so its choice of a wide range. For example, the wires between the frequently opened/closed doors and across the body of a rental car should consist of wires with good flexural properties. For wires used in high-temperature areas, vinyl chloride and polyethylene-coated wires with good insulation and heat resistance are generally used. In recent years, the use of electromagnetic shielded wires for weak signal circuits has also been increasing.

With the increase in automobile functions, the universal application of electronic control technology, more and more electrical parts, wires will be more and more, the number of circuits on the car with a significant increase in the use of electricity, wiring harnesses also become thicker and heavier. This is a big problem that needs to be solved, how to make a large number of harnesses in the limited space of the car how to be more effective and reasonable arrangement, so that the automotive wiring harness to play a greater function, has become a problem faced by the automotive manufacturing industry. Basic introduction to automotive wiring harnesses Introduction to automotive wiring harness functions @2019