In automobile control cables and the wiring design of high-voltage wiring harnesses, avoiding signal interference is the key to ensuring the stable operation of vehicle electronic systems. Based on a comprehensive analysis of multiple sources, the following are some key wiring norms and suggestions:

Layered wiring: To prevent electromagnetic interference generated when high-voltage wiring harnesses transmit strong current from affecting the power supply and signal transmission of the control unit of low-voltage wiring harnesses, a layered design of high-voltage and low-voltage wiring harnesses is usually adopted. The distance between the high-voltage wiring harness and the low-voltage wiring harness should be maintained at around 200 to 300mm.

2. Parallel wiring: For hybrid vehicle models, parallel wiring can be adopted, that is, high-voltage wiring harnesses and low-voltage wiring harnesses are arranged side by side, but they should not cross each other. This method can effectively avoid electromagnetic interference generated when high-voltage wiring harnesses are used for power supply.

3. Vertical cross wiring: If parallel wiring cannot be avoided, a minimum distance of 30cm should be maintained between control cables and high-voltage cables, and they should be crossed at a 90° Angle to reduce electromagnetic interference.

4. Separate signal lines from power lines: Digital signal lines and analog signal lines should be routed separately to avoid mutual interference. At the same time, signal lines and power lines, especially high-current and high-voltage lines, should be laid separately to avoid electromagnetic interference.

5. Shielding measures: Using shielded cables and connectors is an effective way to reduce electromagnetic interference. Shielded cables can effectively reduce unnecessary interference within the frequency range of 100kHz to 200MHz. It is recommended to use single-layer or double-layer shielded wires with a shielding braiding density of no less than 85%.

6. Grounding treatment: Good grounding layout and improved grounding wire bonding can reduce high-frequency impedance, thereby minimizing electromagnetic interference.

7. Wire harness Fixation and protection: Wire harnesses should be equipped with support and fixing devices as required. The distance between two fixing points of straight cables should be less than 300mm, and there must be fixing points within a distance of 120mm from the connectors. In addition, the wiring harness should be kept away from heat sources and wrapped with flame-retardant and heat-insulating materials.

8. Aesthetics and maintainability of wiring harness layout: The layout of wiring harnesses should take into account both aesthetics and maintainability. The direction of the wiring harness should be consistent with that of the attachments, and oblique directions should be avoided. For the wiring harnesses inside the engine compartment, it is advisable to run them under or inside the structural components or parts as much as possible. The exposed high-voltage wiring harnesses at the bottom of the entire vehicle should be shielded and protected with protective tubes or plates.

Through the above-mentioned norms and measures, the signal interference between automobile control cables and the high-voltage wiring harness can be effectively avoided to ensure the stability and reliability of the vehicle electronic system.