How to design EMC (Electromagnetic Compatibility) for automotive wiring harnesses?

Wire harness EMC design needs: 1. Electromagnetic environment - needs and problems ① and outside the car radio and television, wireless communications and other facilities between the interactions; internal electrical components interact with each other; grid equipment interact with each other; the human body static impact and personnel protection. ② EMC three elements of the interference source: the parts and components that generate a change in voltage or current. Propagation path: including conduction coupling, radiation coupling. Sensitive equipment: equipment susceptible to interference. The harness itself is a passive device, itself does not produce electromagnetic interference, but the harness is "propagation pathway"!

Electromagnetic compatibility (EMC) is a discipline that deals with the generation, transmission and reception of electromagnetic energy, and it is a science that studies the coexistence of various electric devices (sub-systems, systems, and in a broader sense, living organisms) under the conditions of limited space, limited time, and limited spectrum resources. EMC Harassment Level 1: The function performs its pre-designed function normally during and after the application of harassment. Level 2: The function may exceed the specified deviation during the application of harassment, but the function must automatically return to its normal operating range after the application of harassment has ceased. Level 3: The function may exceed the specified deviation during/after the application of harassment, but the function must be restored to the normal operating range by the driver. Level 4: The function may exceed the specified deviation during/after the application of harassment and cannot be restored to the normal operating range by driver operation, but can be restored to the normal operating range by repair/replacement.

3.EMC Standards - Regulatory Requirements,Wiring Harness EMC Design and Cases 1.Outline of Wiring Harness EMC Design Wiring Harness EMC design: four aspects: power supply design, hitch design, layout design, wire selection. 2.Power supply part of the EMC design case: the ignition coil and the air flowmeter common power supply line, the ignition coil generates a reverse voltage interference with the air flowmeter, resulting in damage to its internal module.

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