Page - 9 - in Maximum Tire-Road Friction Coefficient Estimation

1 Introduction 20.2 26.6 42.0 49.2 59.5 44.9 4.9 17.6 14.4 20.1 14.9 14.3 20.8 21.2 83.1 61.0 58.7 37.0 34.3 25.0 34.3 33.6 0% 20% 40% 60% 80% 100% ABS+ESC ABS+ESC+AEB ABS+ESC+LKA ABS+ESC+LKA+AEB ABS+ESC+LKA+AEB+DVM+SLS+AI Overall Top Ten Friction-relevant Top Ten All friction-relevant systems Percentage in % Avoidance Potential No potential Not rated 11.3 45.2 Figure 1.6.: Potentialbenefitof friction-relevantsystemsofTUG-RCSstudyforavoiding fatalities in all investigated cases and vehicle types according to Lex et al., [LE11] temsdescribed inSections1.3.2and1.3.3. Lex and Eichberger repeatedthe investigation of the potential benefit to traffic safety for those systems that could be improved by the friction potential, [LE11]. The results show that a vehicle equipped with all friction relevant safety systems could avoid 45.2 % of all accidents and 21.2 % of the fatalities, see Figure 1.6. A vehicle equipped with only the top ten friction-relevant systems could still avoid 44.9 % of the accidents and 20.8 % of the fatalities. Comparing the benefit of 44.9 % to the 59.2 % for all top ten systems indicates that the friction potential influ- ences many of the systems that are relevant for enhancing traffic safety. Although not directly proven, the additional benefit of adapting warning and intervention strategies of the friction-relevant systems to the friction potential is assumed to be quite high, see Sections 1.3.2 and 1.3.3. 1.3.2. Requirements for an estimate of the friction potential for ADAS Although activation strategies vary considerably, the strategy often includes some of the four phases presented below, see also Figure 1.7. In the prediction phase, ADAS detect oncoming collisions that are imminent if the driver does not react. Model-based approaches are used to predict possible collisions with a high probability. The number of missed interventions must be kept low in order to maintain the driver’s acceptance of the system, but false interventions must be prevented. When no collision is imminent, 9