What does ACC mean in automotive circuits?
2 Answers
ACC is the abbreviation for Adaptive Cruise Control, which translates to adaptive cruise control power supply in Chinese. It is commonly used in motor vehicles and is controlled by the car key to supply power to certain components such as the car audio system. Explanation of the ignition switch positions in motor vehicles: START position: This is the engine start position. After starting, it automatically returns to the normal state, which is the ON position. LOCK position: This is the lock position, where the key is inserted or removed. In this state, the vehicle's circuits are completely shut off except for the anti-theft system and interior lights, and the steering wheel is locked. After locking the car, the key will be in the LOCK state. At this time, the key not only locks the steering but also cuts off the power supply to the entire vehicle. ACC position: This is the accessory power-on position. When the key is turned to this position, the accessory circuits are activated, allowing devices such as the radio to function. The ACC state supplies power to some of the vehicle's electrical devices, such as the CD player and air conditioning. ON position: This is the power-on position. When the key is turned to this position, all vehicle circuits are activated, and the system prepares for engine startup and performs necessary self-checks. The key remains in this position during normal driving. ACC in automobiles can also refer to the automatic cruise system. Adaptive Cruise Control (ACC) is an intelligent automatic control system developed from existing cruise control technology. During vehicle operation, a distance sensor (radar) installed at the front of the vehicle continuously scans the road ahead, while wheel speed sensors collect speed signals. If the distance to the vehicle ahead becomes too small, the ACC control unit coordinates with the anti-lock braking system (ABS) and engine control system to apply appropriate braking and reduce engine output, ensuring a safe distance is maintained between vehicles. The adaptive cruise system mainly consists of cruise control sensors, an adaptive cruise control system controller, an engine management controller, an electronic throttle actuator, and a brake actuator (such as ABS/ESP).
I usually enjoy studying various features in cars. In automotive circuits, ACC stands for Accessory Mode. When you turn the car key to this position, some power-consuming devices can operate, such as the radio or cigarette lighter socket for charging, but the engine remains off. This allows you to listen to music or charge your phone without wasting fuel. The ACC mode is primarily designed for energy efficiency and to avoid engine idling wear. For example, I often use it to pass time while waiting in parking lots. However, don't forget that ACC consumes the car battery's power—prolonged use may drain the battery and leave you unable to start the car, which would be a big hassle. Some newer cars have switched to button systems, offering similar functionality but more convenience. Overall, ACC is quite practical, but it's best to double-check whether the key is properly turned off after each use. This small habit can save you a lot of repair troubles and be more environmentally friendly.
