Page - 4 - in Maximum Tire-Road Friction Coefficient Estimation

1 Introduction Traffic education, legal security Car-to-x communication systems Advanced driver assistance systems Self protection (e.g. pre-firing airbag), traffic partner protection Motivation for using safety systems Mitigation of roadside hazards First aid education Crash notification, fire prevention Rescue system, safeguarding of accident scene Driver Vehicle Environment Primary Safety Secondary Safety Tertiary Safety Figure 1.3.: Aspects of traffic safety and examples of safety measures, adapted from [Eic11, p.41] and [Kra08, p.3]. The knowledge of the friction potential can contribute to the areas highlighted in light gray. snowy conditions). Also, a warning device can be activated when the safety margin be- tween the current driving state and the physically achievable maximum has fallen below a safety threshold, [Hol92, p.65-66]. The friction potential can also be used to improve specificadvanceddriverassistance systems(ADAS)orvehicledynamicscontrols (VDC). In secondary safety, only the vehicle level can be adapted, e.g. with airbag pre-firing. In case of imminent collision, the airbags can be pre-fired before the collision takes place in order to reduce the head injury risk for the occupants, [Eic11, p.162-163]. The fric- tion potential must be known in order to detect an imminent collision accurately and to predict the possible trajectories between time of detection and the detected collision, see Section 1.3. Theaccuracyrequirements forestimatingthe frictionpotentialarepresumably lowfor 4