Automotive Wiring Harness Electrical Schematic Design

The design of the electrical principle of automobile wiring harness is an important design content in the design of automobile wiring harness. This is related to the realization of each electrical performance and the effective feedback of the function of the vehicle. The design of electrical principle covers the distribution of vehicle power supply, the principle analysis of vehicle electronic control unit, the distribution of vehicle grounding, and the selection of wiring harness raw materials-wires/relays/fuses. This series is mainly about the basic content of electrical principle design and general design principle requirements.

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Composition of automotive electrical system: In the process of circuit system design, electrical engineers must understand the design input information table of each electrical system and classify it. In general, the automotive electrical system can be divided into two parts: power supply system and power utilization system. The power supply system is mainly composed of battery, generator and circuit; The electrical system usually has five modes and distributed electrical equipment: Battery: It is generally the safety part or important part of the automobile, mainly used for the storage of components, controllers, clocks, audio systems and other components required by regulations, safety, comfort and other logic requirements. Such as engine ECU module, BCM module, airbag module, ABS module, sunroof module, air conditioning control unit, audio system, instrument, TCU module, anti-theft system, starter, oil pump, blower, glass lifter, fog lamp, interior lamp, trunk lamp, brake lamp, headlamp, position lamp, door lamp, horn, diagnostic port, electrically adjustable seat, Power supply of main relay, etc; IG1: supply power to the load when the engine starts and works normally (when the ignition key is in ON position), such as ECU module, air conditioning control unit, BCM module, TCU module, airbag module, ABS module, generator (excitation power supply), ignition coil, speed sensor, instrument, steering lamp, backlight power supply, cruise switch and reversing lamp; IG2: When the ignition key is in the ON position, the power is supplied to the load. When the ignition key is in the start position, the IG2 power is cut off. Generally, it is supplied to the high-power load that will not affect the safety and power performance in an instant, such as the blower control power supply, BCM module, wiper washing, rear defrosting, etc.; ACC: All auxiliary equipment to cut off the power supply when the engine is started; Start: Control power supply of starter or starting relay;

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