TRW Automotive Holdings has developed a new, intelligent safety system – automatic emergency braking (AEB) – which can potentially mitigate the severity of accidents.
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AEB combines environmental sensing and brake systems to slow a vehicle and potentially lessen the severity of an impact when a collision is unavoidable.
The available AEB systems use long- or medium-range radar in combination with a video camera (usually mounted behind the rear view mirror facing forward through the windscreen).
These sensors independently gather data – the radar looks forward in a long but narrower field of view while the camera covers a wider field of view and helps detect and classify objects such as other vehicles.
The data gathered by each of these sensors is fed to the control unit and is constantly compared every 40 milliseconds in what is called data fusion. Both sensors need to independently verify the criticality of a foreseeable crash and confirm that AEB should be deployed. The rapid deceleration of the vehicle can then be accomplished through the use of an electronic stability control unit that can build high levels of brake pressure quickly.
