With its MRR mid-range radar, Bosch (Germany) has developed a technology that uses the 77-GHz frequency band providing precise data about the vehicles on the road ahead. The sensor is used for assistance and safety systems in commercial vehicles. It is connected to the automotive electronics via CAN and Flexray interfaces.
IN COMMERCIAL VEHICLES, SAFETY AND ASSISTANCE FUNCTIONS help drivers and freight to reach their destinations safely. Under an EU regulation, most of the heavy commercial vehicle models in excess of 3,5 t will have to be equipped with advanced emergency braking systems (AEBS) and lane departure warning systems (LDWS) effective November 2013. These assistance functions support drivers during emergency braking and warn them if they unintentionally drift out of lane.
“The new sensor for commercial vehicles is a high-performing and cost-effective basis for emergency braking systems, as well as for convenience functions such as adaptive cruise control,” said Gerhard Steiger, the president of the Bosch Chassis Systems Control division. The company offers a 12-V version of the sensor for light trucks, and a 24-V version for heavy trucks. Series manufacture will start in 2013.
The 77-GHz sensor provides object separation up to three times more accurate, and can measure speed and distance three to five times more accurately than a 24-GHz version. It uses a frequency band, which has been permanently allocated to automotive applications worldwide. “The new MRR is especially suitable for vehicle platforms that are offered in all the world’s markets,” Steiger says. In addition, the measurement data from the sensor can be used to inform drivers how close they are to the vehicle in front.
The silicon-germanium sensor can be concealed in the bumper or mounted unobtrusively in the vehicle’s radiator grille. It is smaller and more cost-effective than the conventional 24-GHz sensors. For use at the rear of the vehicle, a 12-V version is also available for light commercial vehicles. This allows drivers to be warned of vehicles that are in their blind spot, and that are approaching at speed from the rear. It also makes it easier to reverse out of parking spaces where vision is restricted, as approaching vehicles can be reliably detected.
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