What is the ACC function in cars?

[Jordan]

ACC stands for Adaptive Cruise Control, which is the adaptive cruise control power supply in cars, controlled by the car key, providing power to components such as the car audio system. Here are some relevant details: 1. ACC can generally engage in cruise control at lower speeds, making it suitable not only for highway conditions but also for urban traffic, alleviating concerns about stop-and-go traffic. The car's sensors (radar) monitor the driving conditions of the vehicle ahead and the host vehicle (distance and speed). After calculation and judgment by the FCU, commands are sent to the actuators (throttle, brake, gear) to determine the driving state, whether to accelerate, decelerate, or exit cruise control. 2. The most basic function of adaptive cruise control is to maintain the vehicle's longitudinal movement. In the event of a collision risk, the vehicle will alert the driver and initiate active braking intervention. Overall, ACC helps to reduce driver fatigue to some extent.

[LeilaAnn]

ACC stands for Adaptive Cruise Control, which is a lifesaver for long-distance driving. I frequently drive for business trips and activate the ACC function as soon as I hit the highway. It automatically adjusts my speed based on the vehicle ahead, eliminating the need to constantly press the accelerator. After setting the cruising speed and following distance, the system uses front radar to scan the car ahead. If the leading vehicle slows down, my car will also decelerate accordingly, and it speeds up again when the distance increases. However, it can be a bit slow to react to sudden lane changes, so I always keep my hands on the wheel, ready to take over. Most new cars nowadays come with this feature, and when paired with Lane Keeping Assist, it makes driving even more effortless.

[VincentRose]

I've tried the ACC function on quite a few cars, and the most intuitive feeling is how much more relaxed the driving becomes. Once activated, the car automatically follows the vehicle in front without needing to press the accelerator or brake. The system monitors the surrounding environment through a camera behind the windshield and radar at the front of the car, automatically accelerating or decelerating within the set range. For example, when I set the following distance to three levels, the system reacts faster than I do when the car in front brakes suddenly. However, this function can be less effective on winding roads or in rainy and foggy weather. Also, the activation button positions for some brands are particularly hidden, making it necessary to search through the manual for a while to figure it out the first time.

[LaMiguel]

ACC stands for Adaptive Cruise Control, an upgraded version of traditional cruise control. In the past, driving an old car on highways required constant throttle control. Now, with newer SUVs, simply press the button on the left side of the steering wheel to set the speed and following distance. The system continuously monitors the vehicle ahead using millimeter-wave radar, automatically slowing down if the distance becomes too close and resuming the preset speed when traffic clears. After using it for over two years, the biggest advantage is automatic following in traffic jams, completely freeing the right foot. However, it's recommended not to use it in dense urban traffic, as manual intervention is still necessary for safe handling of cut-in situations.

[LeCarlos]

Novice drivers need to pay special attention to the adaptation period when using ACC. The first time I activated it, I got a scare when the car suddenly slowed down on its own—I thought there was a malfunction, but later realized it was because the car in front changed lanes. Its working principle involves scanning vehicles within 200 meters ahead through a sensor array to achieve automatic speed adjustment. It does make highway driving less tiring, but it's best to turn it off in construction zones or heavy rain, as unclear road markings can affect the system's judgment. Additionally, setting the following distance is crucial; if it's too close, sudden braking by the car ahead could lead to a rear-end collision. I usually keep it at around 50 meters for the safest distance.

[Lila]

Nowadays, vehicles priced above 150,000 RMB are mostly equipped with ACC as standard. However, many buyers don't know how to use it. This feature not only enables automatic following but also comes with start-stop functionality in some models. Once, while driving a friend's car stuck in traffic on an elevated highway, I activated ACC, and the car completely controlled acceleration and deceleration on its own—even stopping and restarting in sync with the vehicle ahead. Note that logic varies by brand: European cars tend to brake more linearly, while Japanese models may start up slightly slower. Long-term use can increase fuel consumption by about 2% compared to manual driving, as the system frequently adjusts throttle input. For better fuel efficiency, manual cruise control on flat roads is more effective.