Determining necessity for a warning

The necessity for a warning is determined by the master control unit for lane change warning (SWW). Here the master control unit uses both the data regarding the road users it determined itself and that of the slaves.

The gap (in longitudinal direction) and approach speed are used to calculate the time remaining before a lane change is aborted. If this time falls short of a threshold value for at least one of the detected road users, a decision is made that there is a necessity for a warning. The presence of a road user in the blind spot immediately leads to the necessity for a warning. The necessity for a warning is suppressed if the master control unit receives information from the trailer module that a trailer is hitched (Check Control message). The body of a trailer limits the pickup range of the radar sensors excessively.

The result, i.e. whether a there is necessity for a warning or not, its sent by the master control unit to the ICM control unit.