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.
In real world rollover events with variations in the rollover parameters (i.e. vehicle speed, angle, etc.), the algorithm has to be robust to cover all requirements.
STOOLS, the simulation tool developed by Siemens Automotive, is used to check the algorithm robustness with the data generated from ADAMS vehicle simulation.
This investigation of intensive use of numerical computer simulation shows the importance and capability of simulation in the automotive safety development process for actuators, vehicle behavior in an accident, sensor development, and algorithm development for electronic control units.