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Aktive Systeme der passiven Fahrzeugsicherheit zum Fußgängerschutz, sogenannte crash-aktive Fußgängerschutzsysteme, werden seit 2005 zur Erfüllung der gesetzlichen Anforderungen (siehe Verordnung (EG) Nr. 78/2009 und 631/2009) in Serienfahrzeugen eingesetzt. Diese crash-aktiven Fußgängerschutzsysteme stellen im Gegensatz zu den rein passiven Systemen nur eine instationäre Lösung dar. Da die innerhalb der gesetzlichen Anforderungen definierten Testverfahren zur Bewertung stationärer Systeme entwickelt wurden, können derzeit mögliche Risiken instationärer Systeme nicht berücksichtigt werden. Im Rahmen dieses Forschungsprojektes soll ein Bewertungsverfahren für diese crash-aktiven Fußgängerschutzsysteme entwickelt werden, welches das reale Potential dieser Systeme möglichst gut wiedergibt. Basis hierfür soll eine umfangreiche Untersuchung zusätzlicher Risiken bilden. Die hier untersuchten instationären Schutzmaßnahmen werden nur im Falle eines Fahrzeuganpralls gegen Fußgänger aktiviert, der daher zuverlässig erkannt werden muss. Für die hierfür eingesetzten, kontaktbasierten Sensorsysteme stellen Fußgänger mit geringen Lasteinträgen in die Fahrzeugfront eine große Herausforderung dar. Die Lasteinträge hängen von zahlreichen Faktoren, wie bspw. der Höhe der entsprechenden Krafteinleitungspfade sowie der Größe und dem Gewichts des Fußgängers, ab. Mit Hilfe von umfangreichen Anprallversuchen und -simulationen wird gezeigt, dass die bisher eingesetzten Prüfkörper nur zum Teil für die Erfüllung dieser Anforderungen geeignet sind. Für ein geeignetes Prüfverfahren müssen daher neue Prüfkörper entwickelt werden. Durch die Aktivierung der Schutzmaßnahme soll bei den crash-aktiven Systemen vor allem das Verletzungsrisiko beim Kopfanprall verringert werden. Hierfür wird häufig die hintere Motorhaubenkante angehoben, um zusätzlichen Deformationsfreiraum zur Verfügung zu stellen. Die Haubenanhebung kann jedoch auch in zusätzlichen Verletzungsrisiken resultieren, bspw. durch die exponierte hintere Haubenkante oder die Verringerung des Deformationsfreiraums in Folge des Oberkörperanpralls. Ein Ersatzprüfverfahren zur Bewertung der Haubendeformation mit Hilfe des Hüftimpaktors wird vorgestellt. Ein hybrides Testverfahren bestehend aus Simulation und Versuch eignet sich für eine objektive Bewertung dieser Systeme, wobei die entsprechenden Versuchsparameter mit Hilfe der vorherigen Simulation bestimmt werden können.
Advancing active safety towards the protection of vulnerable road users: the PROSPECT project
(2017)
Accidents involving Vulnerable Road Users (VRU) are still a very significant issue for road safety. According to the World Health Organisation, pedestrian and cyclist deaths account for more than 25% of all road traffic deaths worldwide. Autonomous Emergency Braking Systems have the potential to improve safety for these VRU groups. The PROSPECT project (Proactive Safety for Pedestrians and Cyclists) aims to significantly improve the effectiveness of active VRU safety systems compared to those currently on the market by expanding the scope of scenarios addressed by the systems and improving the overall system performance. The project pursues an integrated approach: Newest available accident data combined with naturalistic observations and HMI guidelines represent key inputs for the system specifications, which form the basis for the system development. For system development, two main aspects are considered: advanced sensor processing with situation analysis, and intervention strategies including braking and steering. All these concepts are implemented in several vehicle prototypes. Special emphasis is put on balancing system performance in critical scenarios and avoiding undesired system activations. For system validation, testing in realistic scenarios will be done. Results will allow the performance assessment of the developed concepts and a cost-benefit analysis. The findings within the PROSPECT project will contribute to the generation of state -of-the-art knowledge, technical innovations, assessment methodologies and tools for advancing Advanced Driver Assistance Systems towards the protection of VRUs. The introduction of a new generation safety system in the market will enhance VRU road safety in 2020-2025, contributing to the "Vision Zero" objective of no fatalities or serious injuries in road traffic set out in the Transport White Paper. Furthermore, the test methodologies and tools developed within the project shall be considered for the New Car Assessment Programme (Euro NCAP) future roadmaps, supporting the European Commission goal of halving the road toll in the 2011-2020 timeframe.
For more than a decade, ADAC accident researchers have analysed road accidents with severe injuries, recording some 20,000 accidents. An important task in accident research is to determine the causative factors of road accidents. Apart from vehicle engineering and human factors, accident research also focuses on infrastructural and environmental aspects. To find out what accident scenarios are the most common in ADAC accident research and what driver assistance systems can prevent them, our first task was to conduct a detailed accident analysis. Using CarMaker, we performed a realistic simulation of accident scenarios, including crashes, with varying parameters. To begin with, we made an initial selection of driver assistance systems in order to determine those with the greatest accident prevention potential. One important finding of this study is that the safety potential of the individual driver assistance systems can actually be examined. It also turned out that active safety offers even much more potential for development and innovation than passive safety. At the same time, testing becomes more demanding, too, as new systems keep entering the market, many of them differing in functional details. ADAC will continue to test all driver assistance systems as realistically as possible so as to be able to provide advice to car buyers. Therefore, it will be essential to develop and improve test conditions and criteria.
Accident research 2.0: New methods for representative evaluation of integral safety in traffic
(2013)
BMW has developed a procedure for rating Advanced Driver Assistance Systems (ADAS) benefits that integrates two distinct tools. The tool "S.A.F.E.R." is designed to analyze the pre-crash phase. The aim of S.A.F.E.R. is to simulate all relevant processes in sufficient detail to obtain reproducible estimates of key indicators (effectiveness, false positives, etc.). The relevant processes include not only traffic and vehicle dynamics, but also environmental and most importantly human factors. Representative distributions of factors and parameters are obtained by taking the stochastic variation of all relevant parameters into account in the simulations. The second tool, known as "ICOS", has been designed to provide a high-resolution, high-fidelity description of crash phase dynamics. If one converts the outputs of stochastic simulation into inputs for crash dynamics, the result is a comprehensive description of exactly how a safety system can reduce injuries. Applications currently focus on high-fidelity simulation of individual crashes in order to enhance our understanding and optimization of connected safety systems. An integrated simulation process thus allows an exact prediction of the effectiveness in individual cases in terms of injury severity. The development and rating of integral safety need to reflect the true efficiency in the field. The integrated approach described here could provide a valid and reproducible basis for rating connected systems of active and passive safety. In particular, "virtual experiments" using a traffic-based approach and incorporating models of all relevant processes constitute an essential element of the approach.
Nigeria ranks one of the highest countries in the world with the largest accident, especially when measured by whiplash associated disorders, whereas, traffic safety education rate, data and information been widely known as preventive indicators have been grossly neglected. In Nigeria, traffic safety enlightenment, awareness, political understanding and appreciation of the problem's magnitude are lacking. This study, therefore, seeks to understand and document the fact that accident causation factors in Nigeria relate more to the problem of development, poverty, knowledge and education as evidenced in most other developing countries. Among the primary accident causation factors on Nigerian roads are: - lack of a transportation system or multi-model integration - sub-standard and obsolete vehicles and road furniture - poor road maintenance, investment and engineering management - paucity of road users' and drivers' knowledge, skill, enlightenment and education of the road Use This paper submits that Nigeria being a developing nation requires purely primitive strategies being cost effective (health wise) than curative measures. It is in this light that an enduring, comprehensive and sustainable traffic safety educational programmes information base and data inventory, analysis and implementations form the focus of this study. This effort will provide basic guidelines framework and implementation procedure for a successful prevention of whiplash associated disorder resulting from road traffic crashes in Nigeria and other parts of the world.
Fahrerassistenzsystemen mit Umfeldwahrnehmung wird ein hohes Potenzial zur Unfallvermeidung zugeschrieben, wenn diese umfassender und intensiver in die Fahrdynamik von Fahrzeugen eingreifen und weiter vernetzt werden. Diese erweiterten Eingriffsmöglichkeiten erzeugen auch neue Risiken, welche vor der Genehmigung und Zulassung für den öffentlichen Straßenverkehr abgesichert werden müssen. Neuartig ist bei diesen Systemen, dass sie nur über eine Situationsrepräsentation die unfallvermeidenden Handlungen ableiten können. Somit kommt zum Risiko des Versagens von Systemkomponenten, das bereits durch die ISO 26262-Norm zur funktionalen Sicherheit adressiert ist, das Risiko aufgrund einer falschen Interpretation auftretenden, nicht situationsgemaessen Auslösung, z. B. durch Situationskonstellationen, die bei der Entwicklung nicht berücksichtigt wurden und daher in den Funktionsspezifikationen nicht enthalten sind. Um die Anforderungen an Absicherungsmethoden für diese Assistenzsysteme zu identifizieren, werden diese zusammengestellt und der Absicherungsaufwand mit bestehenden Methoden, bspw. aufbauend auf den Anforderungen der ISO 26262, bestimmt. Die Analyse zeigt, dass bisherige Ansätze sowohl hinsichtlich der objektiven Nachweisbarkeit der Vollständigkeit der theoretisch möglichen Situationen Lücken aufweisen als auch hinsichtlich des Umfangs der notwendigen Spezifikationen und deren Prüfung in Versuchen. Aufgrund des daher zu erwartenden Aufwands für den Nachweis eines sicheren Verhaltens der Systeme sind eine Priorisierung von Fahrsituationen und die Gewährleistung einer hohen Übertragbarkeit von Bewertungsergebnissen notwendig. Um die Vollständigkeitsproblematik zu adressieren, wird ein Ansatz vorgestellt, der eine objektive Bewertung und den Vergleich von Fahrsituationen ermöglicht. Abschließend werden die Erkenntnisse zusammengefasst und notwendige weitere Schritte für die Schaffung einer einheitlichen Absicherungsstrategie für Fahrerassistenzsysteme abgeleitet.
The European CASPER (Child Advanced Safety Project for European Roads) project studying car child safety includes a sociological approach in order to have a better understanding of the behaviour of parents driving children under 12 years old. A questionnaire was distributed via the internet in Europe with 998 parents (representing 1638 children) from 22 European countries responding. The results inform on the way parents secure their children during a car trip. Many parents did not control how their children were installed in the child restraint system (CRS). A toddler was more likely to travel into a child seat than an older child was. Regarding misuse situations, an important part of the participants did not think that they could make mistakes when fixing the child seat to the car (26%) or when placing the child into the seat (39%). This leaves an important field of action especially by communication via different media and in the CRS sale outlets.
Vehicle crash research at different levels is currently being conducted by several investigation groups in Spain, in some instances within various EU-funded projects. However there is a clear opportunity for increasing compatibility and maximizing usefulness, both at national and European levels, of the information collected by these groups. After reviewing on-going activities and programs in different countries, a framework for a nationwide crash investigation project is proposed: an organizational scheme is suggested as part of a future National Road Safety Strategic Plan; a map of investigation teams located in technological centres, universities and police agencies in Spain is presented; alternatives for several practical aspects such as team composition, deployment and operational budgets and project developmental stages are also discussed.
One main objective of the EU-Project SENIORS is to provide improved methods to assess thoracic injury risk to elderly occupants. In contribution to this task paired simulations with a THOR dummy model and human body model will be used to develop improved thoracic injury risk functions. The simulation results can provide data for injury criteria development in chest loading conditions that are underrepresented in PMHS test data sets that currently proposed risk functions are based on. To support this approach a new simplified generic but representative sled test fixture and CAE model for testing and simulation were developed. The parameter definition and evaluation of this sled test fixture and model is presented in this paper. The justification and definition of requirements for this test set-up was based on experience from earlier studies. Simple test fixtures like the gold standard sled fixture are easy to build and also to model in CAE, but provide too severe belt-only loading. On the other hand a vehicle buck including production components like airbag and seat is more representative, but difficult to model and to be replicated at a different laboratory. Furthermore some components might not be available for physical tests at later stage. The basis of the SENIORS generic sled test set-up is the gold standard fixture with a cable seat back and foot rest. No knee restraint was used. The seat pan design was modified including a seat ramp. The three-point belt system had a generic adjustable load limiter. A pre-inflated driver airbag assembly was developed for the test fixture. Results of THOR test and simulations in different configurations will be presented. The configurations include different deceleration pulses. Further parameter variations are related to the restraint system including belt geometry and load limiter levels. Additionally different settings of the generic airbag were evaluated. The test set-up was evaluated and optimized in tests with the THOR-M dummy in different test configurations. Belt restraint parameters like D-ring position and load limiter setting were modified to provide moderate chest loading to the occupant. This resulted in dummy readings more representative of the loading in a contemporary vehicle than most available PMHS sled tests reported in the literature. However, to achieve a loading configuration that exposes the occupant to even less severe loading comparable to modern vehicle restraints it might be necessary to further modify the test set-up. The new generic sled test set-up and a corresponding CAE model were developed and applied in tests and simulations with THOR. Within the SENIORS project with this test set-up also volunteer and PMHS as well as HBM simulations are performed, which will be reported in other publications. The test environment can contribute in future studies to the assessment of existing and new frontal impact dummies as well as dummy improvements and related instrumentation. The test set-up and model could also serve as a new standard test environment for PMHS and volunteer tests as well as HBM simulations.
Description of road traffic related knee injuries in published investigations is very heterogeneous. The purpose of this study was to estimate the risk of knee injuries in real world car impacts in Germany focusing vulnerable road users (pedestrians, bicyclists and motorcyclists) and restrained car drivers. The accident research unit analyses technical and medical data collected shortly after the accident at scene. Two different periods (years 1985-1993 and 1995-2003) were compared focusing on knee injuries (Abbreviated Injury Scale (AISKnee) 2/3). In order to determine the influences type of collision, direction and speed as well as the injury pattern and different injury scores (AIS, MAIS, ISS) were examined. 1.794 pedestrians, 742 motorcyclists, 2.728 bicyclists and 1.116 car drivers were extracted. 2% had serious ligamentous or bony injuries in relation to all injured. The risk of injury is higher for twowheelers than for pedestrians, but knee injury severity is higher for the latter group. Overall the current knee injury risk is low and significant reduced comparing both time periods (27%, p<0,0001). Severe injuries (AISKnee 2/3) were below 1%). Improved aerodynamic design of car fronts reduced the risk for severe knee injuries significantly (p=0,0015). Highest risk of injury is for motorcycle followed by pedestrians, respectively. Knee protectors could prevent injuries by reducing local forces. The classically described dashboard injury was rarely identified. The overall injury risk for knee injuries in road traffic is lower than estimated and reduced comparing both periods. The aerodynamic shape of current cars compared to older types reduced the incidence and severity of knee injuries. Further modification and optimization of the interior and exterior design could be a proper measurement. Classic described injury mechanisms were rarely identified. It seems that the AIS is still underestimating extremity injuries and their long term results.