Intelligent Speed Adaption (ISA)

Intelligent Speed Adaptation (ISA) is a driver assistance system that helps the driver not to exceed legally enforced speed limits, and so guarantee safe driving. When activated in combination with one of the longitudinal control assistance functions, this function automatically limits the set speed used by any of the longitudinal control assistance functions to the legal limit that has been detected. The driver must supervise the system under all conditions, and must be available to take control of the vehicle. As an assistance system, the function will only assist the driver by adjusting the speed to the legal limit. The driver remains responsible for adhering to the legal speed limit whenever the function is not able to detect the correct speed limit.

Vehicles driving ahead are detected with the help of the radar sensor. The speed and distance are calculated up to about 200 m. A distinction is made between two operating states: "road clear" and "traffic ahead". The system is able to brake the vehicle if an obstacle is detected.

AMRR GEN21 mid-range radar is used to detect objects ahead of the vehicle. The system works with a single wave beam. According to the manufacturer, the system can measure greater distances and accurately determine the distance, speed, angle and height of objects up to 200 m away.

Diagnosis and Calibration:

If, in the course of repair work on the vehicle, changes are made that might affect the effectiveness of the radar sensor, then it must be adjusted.

Due to the structure of the ADAS system, the diagnostic tool cannot access the radar sensor directly. The radar communicates with the "ADAS ECU" via a "private" CAN. The "ADAS ECU" can then be read out by a diagnostic tool.

The mid-range radar is calibrated by positioning a flat metal plate in front of the vehicle and running the calibration process in IDS.