Driving in heavy traffic or keeping a safe distance to the preceding vehicle calls for a high level of concentration. The adaptive cruise control (ACC) can reduce stress for the driver by automatically controlling vehicle speed and maintaining a predefined minimum distance to the preceding vehicle. As a consequence, the driver enjoys more comfort and can better concentrate on the traffic.
A radar sensor is usually at the core of the adaptive cruise control (ACC). Installed at the front of the vehicle, the system permanently monitors the road ahead. As long as the road ahead is clear, ACC maintains the speed set by the driver. If the system spots a slower vehicle within its detection range, it gently reduces speed by releasing the accelerator or actively engaging the brake control system. If the vehicle ahead speeds up or changes lanes, the ACC automatically accelerates to the driver’s desired speed. Standard ACC can be activated from speeds of around 30 km/h (20 mph) upwards and supports the driver, primarily on cross-country journeys or on freeways.
The ACC stop & go variant is also active at speeds below 30 km/h (20 mph). It can maintain the set distance to the preceding vehicle even at very low speeds and can decelerate to a complete standstill. If the vehicle has automatic transmission, and the traffic hold-up is only brief, ACC stop & go can set the vehicle in motion once again. When the vehicle remains stopped longer, the driver needs only to reactivate the system, for example by briefly stepping on the gas pedal to return to ACC mode. In this way, ACC stop & go supports the driver even in heavy traffic and traffic jams. Since ACC is a comfort and convenience system, brake interventions and vehicle acceleration only take place within defined limits. Even with ACC switched on, it remains the driver’s responsibility to monitor the speed and distance from the vehicle in front.
Sensor data fusion
To increase comfort and safety of this function, a multi purpose camera can be installed in addition to the radar sensor. By this, for instance, ACC can, thanks to the lateral measuring accuracy of the multi purpose camera, detect a vehicle entering the driver’s own lane – either planned or unplanned – much earlier, enabling the system to respond more dynamically. For a better and more robust understanding of the scene, data of the radar sensor and the camera can be merged.
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