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What is the work of car harness
Time:2022-02-16 Read: 1388

It is mainly aimed at the problem of car lines, some circuits are connected to the east, and roads are bound.


Car harness is the main network of car circuit. Without harness, there is no car circuit. Wire harness refers to the contact terminal (connector) and wire and cable made of copper stamping, and then the plastic pressed insulator or metal shell is added on the outside, which is bound with wire harness to form the connecting circuit components.


In modern cars, there are many car harnesses, and the electronic control system is closely related to the harness. Someone once made an image analogy: if the functions of microcomputer, sensor and actuator are compared to the human body, it can be said that the microcomputer is equivalent to the human brain, the sensor is equivalent to the sensory organ, and the executive element is equivalent to the motor organ, then the wiring harness is nerve and blood vessel.


The automobile wiring harness is the main body of the automobile circuit network, which connects the electrical and electronic components of the automobile and enables them to play their functions. Without wiring harness, there is no car circuit. At present, the form of wiring harness programming is basically the same for both advanced luxury cars and economical ordinary cars. It is composed of wires, connectors and packaging tapes. It is necessary to ensure the transmission of electrical signals and the reliability of the connecting circuit, provide the specified current value for the electronic and electrical components, prevent electromagnetic interference to the surrounding circuits, and eliminate the electrical short circuit.


In terms of function, there are two types of car harness: the power line that carries the power drive actuator (actuator) and the signal line that transmits the sensor input command. The power line is a thick wire that carries large current, while the signal line is a thin wire that does not carry power (optical fiber communication); For example, the cross sectional area of the wire used for the signal circuit is 0.3 and 0.5mm2.


The cross sectional areas of wires of motor and actuator are 0.85 and 1.25 mm2 respectively, while the cross sectional areas of wires of power circuit are 2, 3 and 5 mm2; The special circuits (starter, alternator, engine ground wire, etc.) have different specifications of 8, 10, 15 and 20mm2. The larger the cross-sectional area of the conductor, the greater the current capacity.


In addition to considering the electrical performance, the selection of wires is also restricted by the physical performance of the vehicle, so its selection range is very wide. For example, the doors of taxis that are often opened/closed, and the wires that cross the car body should be made of flexible wires. Conductors used in high temperature areas generally use vinyl chloride and polyethylene coated conductors with good insulation and heat resistance. In recent years, there are more and more electromagnetic shielding wires for weak signal circuits.


With the increase of vehicle functions and the wide application of electronic control technology, there are more and more electrical components and wires. The number of circuits and power consumption on the vehicle are significantly increased, and the harness becomes thicker and heavier. This is a big problem that needs to be solved. How to arrange a large number of wire harnesses more effectively and reasonably in the limited car space to make the car wire harness play a greater role has become a problem facing the automobile manufacturing industry.


Responsibilities of the harness operator in the automobile factory, 3D wiring design of the harness, and drawing design of the harness. R&D sample harness manufacturing, vehicle harness transfer to production documents.


First of all, determine the vehicle type, lay out the connection of all parts of the vehicle type, including the length, the requirements of electric or signal wires, and specify the specifications. The selection of wires, connectors, auxiliary materials, etc. must be determined first.

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