Crash Safety Module (ACSM)

The Crash Safety Module (ACSM) is the control unit for the passive safety system. The Crash Safety Module (ACSM) evaluates the longitudinal acceleration and lateral acceleration sensor signals. The direction and accident severity are determined based on the acceleration data. Comprehensive tests are used to define triggering thresholds for all possible types of accident. This leads to different triggering thresholds for activation of the various restraint systems. In the event of an impact, the Crash Safety Module (ACSM) determines whether deployment is required and which gas generators should be ignited. The Crash Safety Module (ACSM) transmits a message to other bus users when the restraint systems are triggered. Depending on accident severity, each of the control units performs certain functions, as exemplified by the footwell module (FRM), which responds by switching on the hazard warning flashers.

Fig 1: Identifying Crash Safety Module (ACSM)

Courtesy of BMW OF NORTH AMERICA, INC.