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The electric vehicle harness is the blood vessel of the electric bicycle, through which the power of the battery is output to the motor, control system, lighting signal system and auxiliary system to drive and control the vehicle forward. The carrier of this blood vessel is the electric wire harness.

1. What is the electric wire harness

Electric vehicle harness is divided into main harness and branch harness, which shall be classified according to the system configuration of electric vehicle. The main harness is divided into battery power system harness, power switch harness and control system main power harness; The branch harness is divided into lighting signal harness, control system signal harness, combination switch harness, etc. The harness of lighting signal system can be divided into headlamp, front turn signal lamp, tail lamp, rear turn signal lamp, brake lamp, license plate lamp harness, etc. Plastic connector connection is usually used between harness and harness and between harness and electronic components. Generally, manufacturers use different hole numbers of connectors to distinguish. The main circuit harness of the whole vehicle is mainly centered on the controller and extends to the front and rear of the vehicle body respectively.

2. Working principle of electric vehicle harness

Electric vehicle principle:

At present, all electric vehicles are brushless. The principle of brushless speed regulation is to detect the output mode of the speed regulation knob through the single-chip microcomputer in the controller, and then convert the changed signal into the driving signal of the driving power tube, which provides the corresponding current power supply for the operation of the machine. The knob signal weak drive tube output corresponding small current motor will turn relatively slowly, otherwise the motor current will turn faster.

3. Functions of electric wire harness

Function:

The wire sectional area of the motor and actuator of the new energy in the car harness is 0.85 and 1.25mm2, and the wire sectional area of the power circuit is 23 and 5mm2; 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 wire, the greater the current capacity. In addition to considering the electrical performance, the selection of wires is also limited by the physical performance of the vehicle. Anhui automobile harness manufacturers have a wide range of choices. For example, the doors of taxis that are often opened/closed, and the wires that pass through the car body should be made of flexible wires. Vinyl chloride 1-ene and polyethylene coated conductors with good insulation and heat resistance are generally used for conductors used in high temperature areas. 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 so that the wire harnesses of new energy electric vehicles can play a greater role has become a problem facing the automobile manufacturing industry.