Automotive electronic equipment works on cars whose driving environment is constantly changing. The complexity and variability of electromagnetic energy in the environment means that the sources of electromagnetic interference to the system are relatively wide. Automobile wiring harnesses are spread all over the vehicle and are the main source of electromagnetic interference inside the automobile, and they are often subject to electromagnetic interference. Therefore, how to deal with electromagnetic interference of automobile wiring harness is particularly important.

Shielding interference source equipment and related wiring harness: The electronic control unit used in the main electronic control system of the automobile should be encapsulated in a shielding shell.

Increase wire harness filtering: For longer wire harnesses, in order to reduce conduction and radiation interference, filtering should be added to the wire harness. It is more convenient to socket a suitable ferrite magnetic ring.

Reasonably plan the wiring harness: The wiring harness layout makes the low-power sensitive circuit close to the signal source and the high-power interference circuit close to the load. Separate the low-power circuit and the high-power circuit as much as possible to reduce the induced interference and radiation interference between the wiring harness.

Improve the grounding of the equipment: good grounding arrangements and improved ground wire bonding can reduce high frequency impedance. The grounding of automotive electronic equipment is mainly connected to the nearest car body and the wiring harness shielding layer.

Reduce the interference area of the wiring harness: The wiring harness should be designed with the smallest length, the smallest impedance and the smallest loop area. It is best to use a power supply method with a small loop area such as twisted pair. Increase the distance between the equipment and the interference source: Under the condition that the layout of the interference equipment remains unchanged, modify the installation position of sensitive components to increase the distance to the interference source.