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Mobile WebSiteWith the continuous development of automotive electronic control technology, the number of automotive electronic devices has increased greatly, the operating frequency has gradually increased, and the power has gradually increased, making the automotive work environment filled with electromagnetic waves, resulting in increasingly prominent electromagnetic interference problems, and affecting the normality of electronic devices. Work, but damage the corresponding electrical components. Therefore, the electromagnetic compatibility of automotive electronic equipment has become more and more important. At present, there is an urgent need for extensive application of electromagnetic improvement technologies for automotive sub-equipment.
Automotive electronic equipment is used in automobiles where the driving environment is constantly changing. The complexity and variability of electromagnetic energy in the environment means that the system is exposed to a wide range of sources of electromagnetic interference. The vehicle wiring harness is spread throughout the vehicle and is the main source of electromagnetic interference inside the vehicle, and it is often subjected to electromagnetic interference. Therefore, it is particularly important how automotive wiring harnesses deal with electromagnetic interference.
Screening of interference source equipment and related wiring harnesses: The electronic control unit used in the main electronic control system in automobiles should be housed in a shielded housing.
Adding Harness Filtering: For longer bundles, filters should be added to the harness to reduce conduction and radiated interference. It is more convenient to fit a suitable ferrite core.
Reasonably plan the wiring harness: the wiring harness is arranged so that the low-power sensitive circuit is close to the signal source, the high-power interference circuit is close to the load, and the low-power circuit and the high-power circuit are separated as much as possible to reduce the inductive interference and radiation interference between the wiring harnesses.Improve the grounding of the equipment: A good grounding arrangement and an improved ground connection can reduce high-frequency impedance. Grounding of automotive electronic equipment is mainly connected to the ground of the vehicle body and the harness shield.
Reduce the area of the wire harness to receive interference: The wire harness should be designed to have a minimum length, a minimum impedance, and a minimum loop area, and it is preferable to use a power supply method such as twisted pair and a small loop area. Increase the distance from the equipment to the interference source: In the case of no change in the arrangement of the interference equipment, modify the installation location of sensitive components and increase the distance to the interference source.
In addition, electromagnetic interference from the vehicle system is also caused by electromagnetic interference from the outside of the vehicle and the vehicle body. External interference is the interference that occurs when the vehicle travels through various external electromagnetic environments. The electrostatic disturbance of the vehicle body is related to the automobile and the external environment. . These two kinds of electromagnetic interference also occur in daily automobile operation, so it is worth paying attention.
