In modern cars, there are a very special wire harness, and the electronic control system has a close relationship with the wire harness. Someone once played an image of Metaphor: if the computer, sensors and actuators with the function of the human body to metaphor, can be said that the computer equivalent of the human brain, the sensor is equivalent to a sense organ, the executive component equivalent to the motor organs, then the wire harness is the nerve and blood vessels.
Automotive wiring harness is the network main body of the automobile circuit, connecting the electric and electronic components of the car and make it play a function. At present, whether luxury car or economic ordinary car, the form of wire harness is basically the same, are composed of wire, link plug and parcel tape, it is to ensure that the transmission of electrical signals, but also to ensure the reliability of the connection circuit, the provision of electrical and electronic parts of the current value, to prevent the electromagnetic interference around the circuit, and to exclude electrical short-circuit.
The automobile wiring harness is divided into two kinds of signal lines, which are the power line and the input command of the transmission sensor, which are carried by the carrying drive actuator (actuator). Power line is the large current carrying thick wire, and the signal line is not to carry the power of fine wire (optical fiber communication); for example, the signal circuit with a cross-sectional area of 0.3, 0.5mm2.
In motors, the executing element wire cross-sectional area of 0.85, 1.25mm2 and power supply circuit conductor cross-sectional area for 2, 3, 5mm2 and; and special circuit (starter, alternator, engine ground wire, etc.), with 8, 10, 15, 20mm2 different specifications. The The greater the cross-sectional area of the wire, the greater the current capacity. Wire selection, in addition to considering the electrical performance, but also by the physical performance of the vehicle control, so the choice of a wide range of. For example, the frequent on / off of the car door and the wire across the body should be made up of a flexible wire with good bending performance. In the high temperature part of the use of the wire, the general use of insulation and heat resistance of good vinyl chloride, polyethylene coated wire. In recent years, the use of weak signal circuit electromagnetic shielding line is also increasing.
With the increase of the function of the automobile, the electronic control technology is widely used, more and more electrical parts, the wire will be more and more, the number of circuits on the car and with a significant increase in power consumption, wiring harness will become more coarse. This is the big problem that needs to be solved, how to make a large number of wiring harness in the limited space of the car is more effective and reasonable layout, so that the car wiring harness to play a greater function, has become a problem facing the automotive manufacturing industry.