What Components Make Up an Automotive Electrical Circuit?
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Automotive electrical circuits are typically composed of power supply circuits, starting circuits, ignition circuits, lighting and signal device circuits, instrument information system circuits, auxiliary device circuits, and electronic control system circuits. The power supply circuit, also known as the charging circuit, consists of components such as the battery, generator, regulator, and charging indicator device. Power distribution (electrical distribution) and circuit protection devices can also be categorized under this circuit. The starting circuit is made up of the starter motor, starting relay, starting switch, and starting protection circuit. Devices for preheating during cold starts and their control circuits may also be included in this circuit. The ignition circuit is unique to gasoline-powered vehicles and comprises the ignition coil, distributor, electronic ignition controller, spark plugs, and ignition switch. Computer-controlled electronic ignition systems are generally classified under the engine electronic control system. The lighting and signal device circuit includes headlights, fog lights, position lights, turn signals, brake lights, reverse lights, interior lighting, and related control relays and switches. The instrument information system circuit consists of gauges and their sensors, various warning indicators, and controllers. Auxiliary device circuits are formed by various electrical devices installed to enhance vehicle safety and comfort. The types of auxiliary electrical devices vary depending on the vehicle model, with higher-end vehicles featuring more comprehensive auxiliary electrical systems. Electronic control system circuits primarily include the engine control system (covering fuel injection, ignition, emission control, and automatic transmission), cruise control system, anti-lock braking system (ABS), airbag control system, among others.