Bosch has recently presented the second generation of the ACC(Adaptive Cruise Control) . lt detects obstacles (such as vehicles) in the front of the own vehicle and keeps automatically the safety distance by interacting with brake and accelerator. lt relieves the driver significantly from the task of driving. With this improved product state ACC can be used also on secondary highways. The main component of the system is the sensor control unit, containing the Radar sensor and the ECU in the same housing. The detection distance of the sensor is up to 150m. The CU calculates the distance to detected objects and measures directly the relative speed to the own vehicle. Sensors of the ESP (Electronic Stability Program) provide information about the cruising direction allowing to select the relevant objects for the own ACC. Already in 2000, when the first ACC generation was presented it was the smallest unit on the market. With the new generation the volume of the unit has been reduced to a third allowing a better integration in the vehicles front. Additionally, the detection angle has been doubled to +/- 8 deg. This allows especially in curves and cut in situations in front of the own vehicle to a significantly improved detection behavior. The today's ACC is a convenience system. From 2005 on, Bosch will extend the functionality of ACC from convenience to safety with the 'Predictive Safety Systems'. The first step will be made with Predictive Safety Systeml (PSS1). lt detects hazardous situations with the ACC long range radar sensor. In the case of a hazard the braking system is prefilled to prepare best the vehicle for a potential emergency braking. The second step, PSS2, makes use of a Video sensor to verify objects detected by the radar. This sensor redundancy leads to a more reliable interpretation of objects. To prepare the driver best for the potential collision, a short but violent brake impulse is released. This kind of warning alerts the driver immediately, much faster than optical or acoustical warnings. The third step, PSS3, determines unavoidable collisions in the vehicles front. The system reacts with an immediate, automatic and full activation of the brake, leading to a maximum deceleration. This kind of interaction reduces best the kinetical energy of the vehicle and contributes, thus, to a high collision mitigation.
Vorausschauende Sicherheitssysteme - die Schritte zur Unfallvermeidung
Predictive safety systems - steps towards collision mitigation
2004
10 Seiten, 8 Bilder, 3 Quellen
Aufsatz (Konferenz)
Deutsch
Vorausschauende Sicherheitssysteme, die Schritte zur Unfallvermeidung
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