How to deal with electromagnetic interference in electronic wire harness design?

Automotive electronics are suitable for vehicles with a constantly changing driving environment. The complexity and variability of electromagnetic energy in the environment means that systems are subject to a wide range of sources of electromagnetic interference. Automotive electronic wiring harnesses are located throughout the vehicle and are a major source of electromagnetic interference in the vehicle. And it is often subject to electromagnetic immunity itself, so how automotive electronic harnesses cope with electromagnetic interference is particularly important.

With the continuous development of automotive electronic control technology, the number of automotive electronic devices has greatly increased, the working frequency has been gradually increased, and the power has been gradually increased, which makes the automotive working environment flooded with electromagnetic waves, resulting in electromagnetic radiation increasingly prominent. Interference problems that may affect the normal operation of electronic equipment. If it works normally, it will damage the corresponding electrical components. Therefore, the electromagnetic compatibility performance of automotive electronic equipment is getting more and more attention, and there is an urgent need to widely apply the electromagnetic improvement technology of automotive electronic equipment. With years of experience in automotive electronic wire harness processing, Sheng generally take the following measures: reduce the area of the electronic wire harness subject to interference: the electronic wire harness should be designed to have the minimum length, minimum impedance and minimum loop area, it is best to use stranded and other small loop area of power supply method A pair of. Increase the distance from the equipment to the source of interference: in the case of interference with the layout of the equipment remains unchanged, modify the installation location of sensitive components to increase the distance to the source of interference. Shield the interference source equipment and related wiring harness: The electronic control unit used in the electronic control system should be encapsulated in a shielded enclosure. Reasonable planning of electronic wiring harness: the wiring harness is arranged so that the low-power sensitive circuits are close to the signal source, the high-power interference circuits are close to the load, and the low-power circuits and high-power circuits are separated as much as possible in order to minimize the inductive interference between the wiring harnesses and the radiated interference. Increase harness filtering: For longer electronic harnesses, in order to reduce conducted and radiated interference, the harness should be increased filtering, and insert the appropriate ferrite ring is more convenient. Improve equipment grounding: Good grounding arrangements and improved ground splicing can reduce high frequency impedance. The grounding of automotive electronic equipment is primarily a shield that connects the body to the wiring harness. In addition, electromagnetic interference in automotive systems comes from external sources and from the body. External interference is the interference when the car encounters various external electromagnetic environments during traveling, and the electrostatic interference of the car body is related to the car and the external environment. These two kinds of electromagnetic interference are also often found in the daily operation of the car and deserve attention.

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