CWAB - Collision Warning with Auto Brake
Automotive Dictionary

CWAB - Collision Warning with Auto Brake

A safe distance control system that works in all situations, even when the driver is adjusting the Volvo throttle.

This system first warns the driver and prepares the brakes, then if the driver does not brake in an imminent collision, the brakes are automatically applied. Collision warning with AutoBrake is at a higher technological level than the brake-assisted collision warning introduced in 2006. In fact, while the previous system featured on the Volvo S80 was based on a radar system, Auto Brake collision warning is not only used. radar, it also uses a camera to detect vehicles in front of the vehicle. One of the main advantages of the camera is the ability to recognize stationary vehicles and alert the driver while keeping false alarms low.

In particular, the long-range radar can reach 150 meters in front of the vehicle, while the camera's range is 55 meters. “Because the system integrates information from both the radar sensor and the camera, it provides such high reliability that automatic braking is possible in the event of an imminent collision. The system is programmed to activate autonomous braking only if both sensors detect that the situation is critical. "

In addition, in order to adapt the alarm to different conditions and individual driving style, its sensitivity can be adjusted in the car settings menu. In fact, there are three possible alternatives related to system sensitivity. It starts with an alarm and the brakes are ready. If the car approaches the rear of another vehicle and the driver does not react, a red light flashes on the special head-up display projected onto the windshield.

An audible signal is heard. This helps the driver to react and in most cases an accident can be avoided. If, despite the warning, the risk of a collision increases, the brake support is activated. To shorten the reaction time, the brakes are prepared by attaching pads to the discs. In addition, the braking pressure is increased hydraulically, providing effective braking even when the driver does not press down on the brake pedal with extreme force.

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