On modern vehicles, particularly automotive wiring harness, electronic control systems and harnesses we have a close relationship. Someone once made a vivid metaphor: if the function computer, sensors and actuators of a human analogy, we can say the computer equivalent of the human brain, sensory organs equivalent sensor, actuator tube is equivalent to the motion, then the harness is nerve and blood vessels of the.
Automotive wiring harness is the network's main car circuit, connected to the car's electrical and electronic components and allowed to function without the harness does not exist in automotive circuits. At the moment, whether it is high-level luxury car or Cheap ordinary cars, harness compiled form is basically the same, are the wires, plug-ins and packages Union tape composition, it has to ensure that electrical signals, but also to ensure that the connection circuit the reliability of electrical and electronic components to supply a predetermined current value, to prevent electromagnetic interference on the surrounding circuitry, and to exclude electrical short circuit.
　　Automotive wiring harness from a functional up points, there are carriage driving actuators (actuator) electricity power lines and transmission sensor input command signal line two. Power lines are thick wire transport large currents, and the signal line is not carrying power thin wire (optical fiber communications); for example conductor cross-sectional area of ??the signal circuit for 0.3,0.5mm2.
In the motor, perform wire cross-sectional area of ??the element is 0.85,1.25mm2, and a power supply circuit with a wire cross-sectional area of ??2,3,5mm2; and a special circuit (starters, alternators, engines grounding wire, etc.) is 8, 10,15,20mm2 different specifications. Wire cross-sectional area is larger, the current capacity is also greater. Wire selection, in addition to considering electrical properties, but also constrained by the physical properties of the vehicle-mounted, so the choice is very wide. For example, frequent taxi wire on / off between door and across the body, should consist of a good deflection performance wire. In the high temperature portion of the wire used, the general good insulation and heat resistance of vinyl chloride, polyethylene coated wire. In recent years, the electromagnetic shield weak signal circuits is also increasing.
　　With the increase of vehicle functions and universal application of electronic control technology, more and more electrical parts, wires will be more and more, a significant increase in the number of cars on the circuit and power consumption, it becomes more harness the heavier crude . This is a big problem to be solved, how to make a large number of automobile wire harness in the limited space of the rational arrangement more effectively, making the car harness play a greater function, has become a problem faced by the automotive industry.