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The influence of vehicle and driving situation parameters in a rollover event are evaluated by numerical simulation. Sensors and an algorithm for the deployment decision are necessary for occupant protection with restraint systems. The algorithm must decide in a timely manner to deploy the restraint systems for various rollover scenarios. Given the great variety in rollover situations a numerical vehicle simulation is needed and is the suitable tool to cover all cases. All the different cases were divided into 6 test configurations for this simulation investigation. The computer programs ADAMS and MADYMO were used for the rollover simulation. The results from the vehicle dynamic simulation are the sensor input signals for the algorithm (angular rate and acceleration signal) and these signals are also the values for the MADYMO occupant simulation. In addition, the requirements for the restraint system activation in the different rollover scenarios are also obtained from MADYMO.

This paper describes the physical behavior of rollover situations from a sensor and an algorithm point of view. Algorithm solutions will be described with an emphasis on the rollover / no-rollover discrimination as well as the misuse scenarios. Integration of the Siemens advanced rollover sensing functionality as part of future airbag electronics will be discussed. The Siemens rollover algorithm technology and the performance will be demonstrated on some examples.