What is automobile wiring harness ?

Wiring harness for car :
Automobile wiring harness is the main body of automobile circuit network, without wiring harness there would be no automobile circuit.  A wire harness is a component that forms a connecting circuit after crimping the contact terminals (connectors) made of copper and wires and cables with plasticized pressed insulators or metal shells outside.  
Including wire and cable, connectors, wiring harness industry chain processing equipment, wiring harness manufacturing industry and downstream applications, wiring harness application is very wide, can be used in the automotive, home appliances, computer and communications equipment, a variety of electronic instruments and meters, etc., the entire car body wiring harness connections, general shape is H form on modern cars, automotive wiring harness much more special,  Electronic control system is closely related to wire harness.  Someone has played an image of the metaphor: if the computer, sensor and executive components of the function of the human body to metaphor, can say that the computer is equivalent to the human brain, sensor is equivalent to the sensory organ, executive components are equivalent to the motor organ, so the harness is nerve and blood vessels.  
wiring harness for automobile

Automobile wiring harness is the network main body of automobile circuit. It connects the electrical and electronic parts of automobile and makes them function. There is no automobile circuit without wiring harness.  At present, whether senior luxury car or economical ordinary cars, wiring harness plait is basically the same, in the form of are composed of wire, al plug-in and parcel tape, it should not only ensure transmit electrical signals, also want to ensure the reliability of the connection circuit, to supply electrical components as prescribed by the current value, preventing electromagnetic interference of peripheral circuit, and to exclude the electrical short circuit.  

Automobile wiring harness from the function of the points, there are two kinds of power lines carrying the power of the driving executive components (actuators) and signal lines transmitting sensor input instructions.  Power lines are thick wires that carry a large current, while signal lines are thin wires that do not carry electricity (optical fiber communication).  For example, the cross-sectional area of the conductor used in the signal circuit is 0.3 and 0.5mm2.  
The cross-sectional area of the conductor used in motor and actuator is 0.85 mm2 and 1.25mm2, while the cross-sectional area of the conductor used in power circuit is 2 mm2, 3 mm2 and 5mm2.  And special circuits (starter, alternator, engine grounding wire, etc.) have 8, 10, 15, 20mm2 different specifications.  The greater the cross - sectional area of the wire, the greater the current capacity.  
The choice of wire, in addition to considering the electrical performance, but also by the vehicle when the physical performance of the constraints, so its choice is very wide.  For example, the frequent opening/closing of a taxi door and the wires that span between the car body should be made of wires that flex well.  Generally, vinyl chloride and polyethylene coated wires with good insulation and heat resistance are used for wires used in high temperature areas.  In recent years, the use of electromagnetic shielding wires for weak signal circuits has also increased.  
With the increase of automobile functions, the widespread application of electronic control technology, more and more electrical parts, wires will be more and more, the number of circuits on the car and the significant increase in electricity consumption, the car wiring harness will become thicker and heavier.  This is a big problem that needs to be solved. How to make a large number of wiring harnesses more effectively and reasonably arranged in the limited automobile space, so that the automobile wiring harnesses play a greater function has become a problem facing the automobile manufacturing industry.  
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