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Mobile WebSiteWith the continuous development of automotive electronic control technology, the number of automotive electronic equipment has increased greatly, the working frequency has gradually increased, and the power has gradually increased, making the working environment of the automobile full of electromagnetic waves, causing the electromagnetic interference problem to become increasingly prominent, and affecting the normality of electronic equipment. Work, but damage the corresponding electrical components. Therefore, the electromagnetic compatibility of automotive electronic equipment is receiving more and more attention. At present, it is urgent to apply electromagnetic improvement technology for automotive sub-devices.
Automotive electronic equipment works in cars with changing driving conditions. The complexity and variability of electromagnetic energy in the environment means that the system is exposed to a wide range of electromagnetic interference sources. Automobile wiring harnesses are scattered throughout the vehicle and are the main source of electromagnetic interference inside the car, and they are often subjected to electromagnetic interference. Therefore, how to deal with electromagnetic interference is especially important for automotive wiring harnesses.
The following measures must be taken when the car harness is to deal with electromagnetic interference:
1. Shielding interference source equipment and related wiring harness: The electronic control unit used in the main electronic control system of the automobile should be packaged with a shielded casing.
2. Add wire harness filtering: For longer wire harnesses, in order to reduce conduction and radiation interference, filter should be added to the wire harness. It is convenient to sleeve a suitable ferrite magnetic ring.
3. Reasonable planning of the wiring harness: The wiring harness arrangement makes the small power sensitive circuit close to the signal source, the high power interference circuit is close to the load, and the small power circuit and the high power circuit are separated as much as possible to reduce the inductive interference and radiation interference between the wire harnesses.
4. Improve grounding of equipment: Good grounding arrangement and improved grounding overlap can reduce high frequency impedance. The grounding of automotive electronic equipment is mainly connected to the vehicle body and the wiring layer of the wiring harness.
5. Reduce the area of wire harness receiving interference: The wire harness should be designed to have the minimum length, minimum impedance and minimum loop area. It is best to use a power supply mode with a small loop area such as twisted pair. Increase the distance from the device to the interference source: In the case of the same arrangement of the interference device, modify the installation position of the sensitive component and increase the distance to the interference source.
In addition, the electromagnetic interference of the automobile system is also caused by electromagnetic interference from the outside of the vehicle and the vehicle body. The interference outside the vehicle is the interference experienced when the vehicle is subjected to various external electromagnetic environments, and the static interference of the vehicle body is related to the automobile and the external environment. . These two kinds of electromagnetic interference also occur in daily car operation, which deserves attention. Automotive electronic equipment works in cars with changing driving conditions. The complexity and variability of electromagnetic energy in the environment means that the system is exposed to a wide range of electromagnetic interference sources. Automobile wiring harnesses are scattered throughout the vehicle and are the main source of electromagnetic interference inside the car, and they are often subjected to electromagnetic interference. Therefore, how to deal with electromagnetic interference is especially important for automotive wiring harnesses.
