9.3.1. Object detection

Detecting the presence of vehicles in front of the car is one of the most important functions of Active Cruise Control The introduction of the Stop & Go function entails extending this functionality to include not only long-range detection but also short-range detection right through to the area directly in front of the car's front bumper. This is necessary, since the vehicle will travel very close to the vehicle in front of it, (see the "DISTANCE CONTROL " section). The ACC Stop & Go sensor scans the short and long range ahead of the vehicle using radar waves. As well as detecting objects, the ACC sensor also determines the position of the objects in the x and y directions and computes their speed relative to our vehicle. The ACC sensor uses this relative-speed information to compute the acceleration of the objects relative to the car. These values are needed for distance control.