Thank you of a very interesting scientific explanation of how ACC works; however, I regret your explanation does not help in determining what is causing these error signals and to what extent the safety systems are affected, namely ACC and PAS
[h2] [/h2][h2]yes, I was referring to external interference. I will be really interested in the response from your OPC. [/h2][h2] [/h2][h2]ACC uses the Doppler effect [/h2]
In order to determine the values required for the adaptive cruise control system, the vehicle is equipped with an ACC radar antenna with several radar sensors that are installed in the front of the vehicle. The measurement is physically based on the Doppler effect. The relative speed is determined by measuring the different wavelengths between the transmitted and reflected signal. If an object is moving towards the vehicle, for example, the frequency of the reflected wave increases. If the object moves away from the transmitter, the frequency decreases. A comparison of the two signal curves takes place in the sensor control unit (SCU), which is responsible for controlling the adaptive cruise control system. The SCU also houses the compact radar sensor unit and the electronic control unit (ECU) for the ACC system.
Whereas the first generation of adaptive cruise control monitored the measured area using three radar beams, with the centre radar beam being directed precisely forwards and the two side sensors each directed to the side at an angle of 2.5 angular degrees, second-generation ACC systems use four radar beams. This improves the entire horizontal measurement range of the radar sensor from ± 4 to ± 8 angular degrees. With a transmission frequency of 76 to 77 Gigahertz, the ACC sensor continuously scans an area of between 2 and 120 metres in front of the vehicle with a power of around 10 mW.