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In modern cars, the car wiring harness particularly large, electronic control systems and wiring harness has a close relationship. Someone once called a figurative metaphor: if the functions of a microcomputer, a sensor and an actuator are compared with a human body, it can be said that a microcomputer is equivalent to a human brain, a sensor is equivalent to a sensory organ, and an actuator is equivalent to an actuator tube. Then a wire harness is a nerve And blood vessels too.
Automotive wiring harness is the main body of the automotive circuit network, connecting the car's electrical and electronic components and make it function, there is no wiring harness there is no car. At present, the wiring harness is basically the same in the form of high-class luxury cars or economical general automobiles, all of which are made up of electric wires, plug-ins and wrapping tapes. It not only ensures the transmission of electric signals but also ensures that the connecting circuit The reliability of the electrical and electronic components to supply the provisions of the current value to prevent electromagnetic interference to the surrounding circuits and to exclude electrical short circuit.
Car wiring harness from the function of points, there are driving power transmission actuator (actuator) power line and the transmission of sensor input command signal line two. The power line is a thick wire that carries a large current while the signal line is a thin wire (optical fiber communication) that does not carry power; for example, the cross-sectional area of the wire for the signal circuit is 0.3, 0.5 mm2.
In the motor, the actuator wire cross-sectional area of 0.85,1.25 mm2, and the power supply circuit with wire cross-sectional area of 2,3,5 mm2; and special circuits (starter, alternator, engine ground, etc.) 10,15,20 mm2 different specifications. The larger the wire cross-sectional area, the greater the current capacity. The choice of wire, in addition to considering the electrical properties, but also subject to physical constraints when the car, so the choice of a wide range. For example, frequent on / off doors on a taxi and wires across a car body should be constructed of good flexing wires. Conductors used in high temperature parts generally use vinyl chloride and polyethylene coated wires with good insulation and heat resistance. In recent years, the weak signal circuit using the electromagnetic shielding wire is also increasing.
With the increase of car functions, the common application of electronic control technology, more and more electrical parts, more and more wires, a significant increase in the number of circuits and electricity consumption in the car, the harder and harder the wiring harness becomes . This is a big problem that needs to be solved. How to make a large number of wiring harnesses more efficiently and reasonably arranged in a limited space and make the wiring harnesses function more has become a problem for the automobile manufacturing industry.
Automotive wiring harness is the main body of the automotive network, there is no wiring harness there is no car circuit. As automotive safety, comfort, economy, and emissions requirements increase, automotive wiring harnesses become more and more complex, but the body is given more and less wiring harness. Therefore, how to improve the overall performance of automotive wiring harness design has become the focus of attention, and the automotive wiring harness manufacturers are no longer simply engaged in the design and manufacture of wire harness, joint development with the host car manufacturers have become an inevitable trend. According to the author's experience in wire harness design and manufacture for several years, he talks about the general design flow and design principles of wire harness.
