Method of detecting impacts

摘要

The method involves measuring the acceleration acting on a vehicle using an acceleration sensor (2.1,2.2). The acceleration signal, or preferably its integral is compared with a variable triggering threshold. At least one pre-crash sensor (1.1,1.2) records the variation of the relative speed or distance of objects within a defined proximity of the vehicle. If the relative speed is detected to be above a given threshold or the distance is detected to be below a given threshold, this is identified as a safety critical condition and the triggering threshold is reduced.