The development trend of automotive wire harness

The automobile wire harness is the main body of the automobile circuit, and there are no wires. The electronic control system is closely related to the wire harness in modern automobile. Using the human body for ECU, sensors and actuator functions, ECU is equivalent to the human brain. The sensor is equivalent to the sensory organ, and the actuator is the equivalent of a motor organ. Clearly, the mind and various organs, without nerves and blood vessels, will not function properly. As car safety, comfort and environmental protection requirement enhances unceasingly, on the car circuit number and power consumption increased significantly, make a lot of wiring harness how to be more effective in the limited space reasonable decorate has become a car manufacturing problems. This paper briefly introduces the current situation and development trend of automobile cable bundle light weight, modularization and vehicle-mounted communication technology.

Light harness

The automobile wire harness ADAPTS to the multi-function of the vehicle and the user demand diversification, the car occupies the space gradually expands.In fact, increasing the fuel economy and reducing weight of the automobile, the wire itself from the original AV line to reduce the diameter, the AVS line to the AVSS line, the diameter of the wire is decreasing.

One of the effective ways to reduce weight loss is to reduce the size and weight of connectors and relays. We know that there are hundreds of wire harness connectors in the vehicle wiring harness, as the development of the technology and the development and application of materials, the volume and weight of wire harness connectors are reduced. At present, the small connector developed by sumitomo corporation of Japan will lose 20% ~ 40% of its weight in the same function. Also, as a important part in the wiring harness system relay in miniaturization and lightweight and integration in all kinds of controller, the relay when the layout so the volume of the lower, the vehicle important decreases.

The application of aluminum conductor is also an important symbol of light weight quantification. Compared with copper, aluminum wires can reduce the weight of the body wire by more than 30%, which can reduce the weight of the car by about 1.8kg. Using aluminum leads can effectively reduce vehicle weight, improve fuel economy and reduce carbon dioxide emissions. With the continuous improvement of technical level, the future use of aluminum conductor will be greatly improved.

RIM polyurethane foaming technology can also effectively reduce the weight of the harness. The use of foaming technology to replace the traditional shield and bracket can not only reduce the weight of the harness but also the space arrangement of the wire harness. The cable bundle made of polyurethane has the characteristics of light weight, anti-oil pollution, strong dust ability and no noise after installation. In recent years, polyurethane, one of the polymer materials, has been widely used in the manufacture of auto parts with its good material properties.

modular

Since the 1990s, we have been promoting the use of modular mode of production in Europe, America and Japan. As the distribution medium in the module, the plane wiring materials such as flexible printing circuit (FPC: flexible printed circuit) or flexible flat cable are adopted. The modular application has very limited roof, door and distribution board in the wiring space

The flexible printing circuit is applied to the module, and the assembly of electronic parts or the integration of sensor parts makes the wiring materials develop in a high functional direction. For example, the application of the FPC dashboard to the diaphragm support sensor or antenna is a good example.

At present, the domestic autonomous car factory mainly USES the traditional wire harness and fuse box in the design of the fuse box, and the wire harness and fuse box are not detachable. A car typically USES two to four fuse boxes with dozens of relays. In the harness assembly, the fuse box occupies a large space and weight. With the continuous development of technology, improve the quality of products, the independent brand makers in the wiring harness fuse box to apply more wire and fuse box fission detachable type, more of the relay, the control unit and other components together BCM (body controller). With the high development of production line automation, modular assembly will greatly reduce assembly time and improve work efficiency.

Vehicle-mounted communication technology

The extensive application of electronic technology vehicles leads to the large and complicated body wiring. In recent years, multi-channel transmission technology (LAN) has greatly reduced the number of circuit traffic.

Automobile network technology has emerged as the development direction of automobile technology. For a long time, multi-channel communication technology has been regarded as a solution to the continuous increase of vehicle wiring harness. The world's big car companies make special standards.Multi-channel communication technology is expensive only for advanced vehicles. In recent years, with the increasing of the electronic system and the insufficient data delivery, the small economy car also requires the development of high function.

Along with the continuous development of science and technology, the future development will be more lightweight, modular, automotive wiring harness and the continuous development of vehicular communication system will be more widely applied to automobiles, the development of new network communication, cars will be more intelligent, more reliable data transmission, at the same time also to the requirement of wire will continue to improve.