As the application of electronically controlled engines becomes more and more widely, there are more and more power-on components of the engine. The radiation of the electrical components themselves and the interference between them lead to higher and higher background noise of the engine itself, and more and more serious electromagnetic pollution. has attracted widespread attention. Wire harness products are used to transmit voltage and various electrical signals, which are equivalent to a large “antenna”, and also provide a medium and channel for electromagnetic interference. How to improve the anti-electromagnetic interference ability of automobile engine wiring harness has also become an important topic.
To avoid interference, the first thing that comes to mind is “shielding”. Shielding is the use of metal shields to isolate electromagnetic field interference, which can not only prevent external electromagnetic field interference, but also prevent its own electromagnetic field radiation from interfering with the outside world. For the engine wiring harness, most of the current electromagnetic shielding methods are electrostatic shielding, which is mostly realized by wrapping the shielding tape outside the wiring harness, and the excess electric charge is transmitted to the ground by the method of grounding the shielding tape. For occasions with high shielding requirements, the engine controller, the wiring harness connector of the sensor, and the wiring harness docking point will all use metal casings and be connected with shielding tape, which will ensure the shielding effect of each branch point of the wiring harness.