Automotive wiring harness is the main body of the car circuit, there is no wiring harness does not exist in the car circuit. Harness is made of copper by the contact with the terminal (connector) and wire and cable crimp, the outside and then plastic pressure insulator or external metal shell, etc., to form a wiring harness bundle connection components. The automotive harness is functionally divided into two types of power lines that carry the drive actuator actuators (actuators) and the signal lines that carry the sensor input commands. With the improvement of comfort, economy and safety requirements, the variety of electronic products on the automobile is increasing, the automobile wiring harness is more and more complicated, and the failure rate of the harness is correspondingly increased.
Automotive wiring harness commonly used specifications of the nominal cross-sectional area of 0.5,0.75,1.0,1.5,2.0,2.5,4.0,6.0 square millimeter of the wire (Japanese cars commonly used in the nominal cross-sectional area of 0.5,0.85,1.25,2.0 , 2.5, 4.0, 6.0 square millimeters), each of which has a permissible load current value, and is used for wires of different power equipment. The specification line is suitable for the lamp, the indicator light, the door lamp, the dome light, etc .; The 0.75 specification line is suitable for the license plate lamp, the front and rear small lamps, the brake lights and so on; 1.0 The specification line is suitable for turning lights, fog Lights, etc .; 1.5 specifications for headlights, speakers, etc .; main power lines such as generator armature line, ground wire and other requirements 2.5 to 4 square millimeters of wire. This is only refers to the general car, the key depends on the maximum load current value, such as battery grounding line, the cathode power cord is a dedicated car wire alone, their diameter is relatively large, at least a dozen square millimeters Above, these "giant" wire will not be included in the main harness.
In modern cars, automotive wiring harness is particularly large, electronic control system and wiring harness is closely related. Someone has played an image of the metaphor: If the computer, the function of the sensor and the implementation of components with the human metaphor, it can be said that the computer is equivalent to the human brain, the sensor is equivalent to the sensory organs, the implementation of components equivalent to the movement tube, then the harness is the nerve And blood vessels.
Automotive wiring harness is the main body of the car circuit, connecting the electrical and electronic components of the car and making it function, there is no wiring harness does not exist in the car circuit. At present, whether it is high-level luxury cars or economic general car, wiring harness is basically the same form, are composed of wires, connectors and wrapping tape, it is necessary to ensure that the transmission of electrical signals, but also to ensure that the connection circuit The reliability of the supply of electrical and electronic components to the provisions of the current value to prevent the electromagnetic interference around the circuit, and to exclude electrical short circuit.
The automotive harness is functionally divided into two types of power lines that carry the drive actuator actuators (actuators) and the signal lines that carry the sensor input commands. The power line is a thick wire that carries a large current, and the signal line is a fine wire (optical fiber communication) that does not carry electricity. For example, the signal circuit has a conductor cross-section of 0.3 and 0.5 mm2.
In the motor, the implementation of the conductor with a cross-sectional area of 0.85,1.25 mm2, and the power circuit with a 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 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 physical performance of the vehicle when the constraints, so its wide range of options. For example, the frequent opening / closing of the car on the car and across the body between the wires should be composed of good bending performance of the wire. In the high temperature parts of the use of wire, generally use the insulation and good heat resistance of vinyl chloride, polyethylene coated wire. In recent years, weak signal circuit using electromagnetic shielding lines are also increasing.
With the increase in the function of the car, the general application of electronic control technology, more and more electrical parts, the wire will be more and more cars on the number of circuits and electricity significantly increased, the wiring harness will become more coarse and heavier The This is a big problem to be solved, how to make a large number of wiring harness in a limited car space how to more effectively rational layout, the car harness to play a greater function, has become a car manufacturing industry problems.