Abteilung Fahrzeugtechnik
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Institut
- Abteilung Fahrzeugtechnik (209) (entfernen)
Europe has benefited from a decreasing number of road traffic fatalities. However, the proportion of older road users increases steadily. In an ageing society, the SENIORS project aims to improve the safe mobility of older road users by determining appropriate requirements towards passive vehicle safety systems. Therefore, the characteristics of road traffic crashes involving the elderly people need to be understood. This paper focuses on car occupants and pedestrians or cyclists in crashes with modern passenger cars. Ten crash databases and four hospital statistics from Europe have been analysed to answer the questions on which body regions are most frequently and severely injured in the elderly, and specific injuries sustained by always comparing older (65 years and above) with midâ€aged road users (25â€64 years). It was found that the body region thorax is of particularly high importance for the older car occupant with injury severities of AIS2 or AIS3+, where as the lower extremities, head and the thorax need to be considered for older pedestrians and cyclists. Further, injury risk functions were provided. The hospital data analysis showed less difference between the age groups. The linkage between crash and hospital data could only be made on a general level as their inclusion criteria were quite different.
Schutz von schwächeren Verkehrsteilnehmern: kommende Anforderungen aus Gesetzgebung und Euro NCAP
(2017)
Systeme der aktiven Fahrzeugsicherheit, insbesondere Notbremsassistenzsysteme und automatische Notbremssysteme, haben in den letzten zwei Dekaden große technische Fortschritte gemacht, und das im Wesentlichen ohne "Druck" von Gesetzgeber oder unabhängigen Testorganisationen " diese können aber durch passende Anforderungen den Vormarsch der Systeme in die Breite und die Ausnutzung von ansonsten für den Hersteller vielleicht nicht wirtschaftlichen Potentialen unterstützen. Dieser Bericht hat das Ziel, einen Überblick über die kommenden Anforderungen an Schutzsysteme für schwächere Verkehrsteilnehmer zu geben und diese Anforderungen in den Kontext Euro NCAP (=welchen Einfluss haben diese Anforderungen auf die Gesamtbewertung?) sowie Gesetzgebung (schwächere Anforderungen, aber dafür ein Markteintrittskriterium) zu stellen: - Anforderungen und Testprozeduren für Notbremsassistenz Fahrradunfälle 2018 und 2020 in Euro NCAP; - Anforderungen und Testprozeduren für Notbremsassistenz bei Nachtunfällen mit Fußgängern in Euro NCAP 2018; - Anforderungen und Testprozeduren für Abbiegeassistenzsysteme zum Schutz von Radfahrern in Unfallsituationen mit rechtsabbiegenden Lkw innerhalb der Fahrzeugtypgenehmigung.
Accidents between right turning trucks and straight driving cyclists often show massive consequences. Accident severity in terms of seriously or fatally injured cyclists that are involved is much higher than in accidents of other traffic participants in other situations. It seems clear that adding additional mirrors will very likely not improve the situation. At ESV 2015, a methodology to derive test procedures and first test cases as well as requirements for a driver assist system to address blind spot accidents has been presented. However, it was unclear if and how testing of these cases is feasible, to what extent characteristics of different truck concepts (e.g. articulated vehicles, rigid vehicles) influence the test conduction and outcome, and what tolerances should be selected for the different variables. This work is important for the acceptance of a draft regulation in the UN working group on general safety. In the meantime, three test series using a single tractor vehicle, a tractor-semitrailer combination and a rigid vehicle have been conducted. The test tools (e.g. surrogate devices) have been refined. A fully crashable, commercially available bicycle dummy has been tested. If used correct, this dummy does follow a straight line quite precisely and it does not cause any damage to the truck under test in case of accidental impact. The dummy specifications are freely available. During testing, the different vehicle categories resulted in different trajectories being driven. Articulated vehicle combinations did first execute a turn into the opposite direction, and on the other hand, single tractor vehicles did behave comparable to passenger cars. A possible solution to take these behaviors into account is to require the vehicles to drive through a corridor that is narrow for a precise straight-driving phase and extends during the turn. Other investigated parameters are the dummy and vehicle speed tolerances. The results from this research make it possible to draft a regulation for a driver assistance system that helps to avoid blind spot accidents: test cases have been refined, their feasibility has been checked, and corridors for the vehicles and for important parameters (e.g. test speeds) have been set. The test procedure is applicable to all types of heavy goods vehicles. In combination with the accidentology (ESV 2015 paper), the work provides the basis for a regulation for such an assistance system.
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.
Für eine Reihe von EU Regelungen im Bereich Fahrzeugsicherheit erlaubt eine Verordnung bereits seit dem Jahr 2010 virtuelles Testen für die Typzulassungsprüfung. Technische Details bzw. konkrete Prozeduren für spezifische Regelungen sind in dieser Verordnung jedoch nicht enthalten. Das Hauptziel des europäischen Projekts IMVITER (lmplementation of Virtual Testing in Safety Regulations) war es, basierend auf der neuen Verordnung ein virtuelles Testverfahren auszuarbeiten und dabei offene Fragen zu berücksichtigen. Um die im Projekt-Konsortium unter Berücksichtigung der Anliegen aller Interessensgruppen wie Autohersteller, Zulassungsbehörden und technischer Dienste erarbeiteten offenen Punkte zu adressieren, wurde ein generisches Flussdiagramm entwickelt, das den Ablauf einer virtuell basierten Typprüfung darstellt. ln diesem Diagramm ist der virtuelle Typgenehmigungsprozess in drei aufeinander folgende Phasen aufgeteilt, die Verifikations-, Validierungs- und Typgenehmigungsphase. Von entscheidender Bedeutung ist die Phase der Validierung des Simulationsmodells, für die im IMVITER-Projekt eine Methodik vorgeschlagen wurde. Mit der im Projekt vorgeschlagenen Validierungsmethode ist kein Austausch des Simulationsmodells zwischen Fahrzeughersteller und technischem Dienst notwendig, so dass die Vertraulichkeit von Betriebsgeheimnissen nicht gefährdet ist. Zur Validierung des Modells werden jedoch immer Versuche notwendig sein. Dies gilt sowohl für die Überpruefung von passiven als auch aktiven Fahrzeugsicherheitssystemen. Eine zusammenfassende Betrachtung der Erfahrungen aus dem IMVITER-Projekt ergab, dass mit der Einführung von virtuellem Testen keine Erhöhung der Anforderungen an die Fahrzeugsicherheit bzgl. bestehender Regelungen verbunden sein sollte. Jedoch werden auch weiterhin neue zusäztliche Regelungen erforderlich sein, da sich das Unfallgeschehen und die Fahrzeugtechnologie weiterentwickeln und ändern werden. Diese sollten von Beginn an die Möglichkeiten des virtuellen Testens nutzen, insbesondere bei Testverfahren für neue Technologien, z.B. aktiver Fahrzeugsicherheitssysteme. Hier bieten virtuelle Testverfahren nicht nur eine Kosten- oder Zeitersparnis, sondern ermöglichen teilweise erst die sinnvolle Abprüfung von neuen Sicherheitssystemen, die mit aktuellen auf Hardware-Test basierenden Verfahren überhaupt nicht möglich wären.
Automatische Lenkfunktionen sind abgesehen von korrigierenden Lenkeingriffen entsprechend der UN-Regelung Nr. 79 bisher nur in einem Geschwindigkeitsbereich bis 10 km/h erlaubt. Die Weiterentwicklung der Technik im Bereich der Fahrerassistenzsysteme und der Automatisierung der Fahraufgabe wuerden es jedoch technisch erlauben, automatische Lenkfunktionen auch bei höheren Geschwindigkeiten einzusetzen. Neben einem Zugewinn an Komfort wird von diesen Systemen auch ein Beitrag zur Erhöhung der Verkehrssicherheit erwartet. Dieses Verkehrssicherheitspotenzial wird man jedoch nur ausschöpfen können, wenn die automatisierten Lenksysteme entsprechend gestaltet sind. Insbesondere sollten mögliche Risiken auf Grund automatischen Lenkens minimiert sein. Aus diesen Gründen laufen derzeit Arbeiten auf UNECE-Ebene, die Regelung Nr. 79 über einheitliche Bedingungen für die Genehmigung der Fahrzeuge hinsichtlich der Lenkanlage in Bezug auf automatische Lenkfunktionen (ACSF = Automatically Commanded Steering Functions) zu überarbeiten, um diese unter bestimmten Bedingungen auch bei höheren Geschwindigkeiten genehmigen zu können. Der vorliegende Beitrag reflektiert diese Arbeiten und stellt die Entwicklung der technischen Anforderungen an automatisches Lenken und der für die fahrzeugtechnischen Vorschriften vorgesehenen Testprozeduren dar.
Die Level kontinuierlicher Fahrzeugautomatisierung sind unter Fahrerassistenzexperten weithin bekannt und erleichtern das Verständnis. Sie können aber nicht Fahrzeugautomatisierung insgesamt zufriedenstellend beschreiben: Insbesondere temporär intervenierende Funktionen, die in unfallnahen Situationen eingreifen, können offensichtlich nicht nach dem Level kontinuierlicher Fahrzeugautomatisierung beschrieben werden. Diese beschreiben nämlich die zunehmende Aufgabenverlagerung vom Fahrer zur maschinellen Steuerung bei zunehmendem Automatisierungsgrad. Notbremsfunktionen, beispielsweise, sind offensichtlich diskontinuierlich und nehmen zugleich auf intensive Weise Einfluss auf die Fahrzeugsteuerung. Sie lassen sich gerade nicht sinnvoll nach dem Level kontinuierlicher Fahrzeugautomatisierung beschrieben. Das Ergebnis kann indes nicht zufriedenstellen. Die fehlende Sichtbarkeit dieser Funktionen wird ihrer Bedeutung für die Verkehrssicherheit nicht gerecht. Daher wird im Beitrag, um ein vollständiges Bild der Fahrzeugautomatisierung zu erlangen, ein umfassender Ansatz zur Beschreibung verfolgt, der sich auf oberster Ebene nach Wirkweise unterscheidet. Auf dieser Basis lassen sich sowohl informierende und warnende Funktionen als auch solche, die nur temporär in unfallgeneigten Situationen intervenieren, im Detail beschrieben. Das ermöglicht es, eine eigenständige Klassifikation für unfallgeneigte Situationen zu erstellen; dies kann für diese wichtigen Funktionen die eigenständige Sichtbarkeit herstellen, die ihrer Bedeutung gerecht wird.
The presence and performance of Advanced Driver Assistance Systems (ADAS) has increased over last years. Systems available on the market address also conflicts with vulnerable road users (VRUs) such as pedestrians and cyclists. Within the European project PROSPECT (Horizon2020, funded by the EC) improved VRU ADAS systems are developed and tested. However, before determining systems" properties and starting testing, an up-to-date analysis of VRU crashes was needed in order to derive the most important Use Cases (detailed crash descriptions) the systems should address. Besides the identified Accident Scenarios (basic crash descriptions), this paper describes in short the method of deriving the Use Cases for car-to-cyclist crashes. Method Crashes involving one passenger car and one cyclist were investigated in several European crash databases looking for all injury severity levels (slight, severe and fatal). These data sources included European statistics from CARE, data on national level from Germany, Sweden and Hungary as well as detailed accident information from these three countries using GIDAS, the Volvo Cars Cyclist Accident database and Hungarian in-depth accident data, respectively. The most frequent accident scenarios were studied and Use Cases were derived considering the key aspects of these crash situations (e.g., view orientation of the cyclist and the car driver- manoeuvre intention) and thus, form an appropriate basis for the development of Test Scenarios. Results Latest information on car-to-cyclist crashes in Europe was compiled including details on the related crash configurations, driving directions, outcome in terms of injury severity, accident location, other environmental aspects and driver responsibilities. The majority of car-to-cyclist crashes occurred during daylight and in clear weather conditions. Car-to-cyclist crashes in which the vehicle was traveling straight and the cyclist is moving in line with the traffic were found to result in the greatest number of fatalities. Considering also slightly and seriously injured cyclists led to a different order of crash patterns according to the three considered European countries. Finally the paper introduced the Use Cases derived from the crash data analysis. A total of 29 Use Cases were derived considering the group of seriously or fatally injured cyclists and 35 Use Cases were derived considering the group of slightly, seriously or fatally injured cyclists. The highest ranked Use Case describes the collision between a car turning to the nearside and a cyclist riding on a bicycle lane against the usual driving direction. A unified European dataset on car-to-cyclist crash scenarios is not available as the data available in CARE is limited, hence national datasets had to be used for the study and further work will be required to extrapolate the results to a European level. Due to the large number of Use Cases, the paper shows only highest ranked ones.
A reduction of around 48% of all road fatalities was achieved in Europe in the past years including a reduced number of fatalities with an older age. However, among all road fatalities, the proportion of elderly is steadily increasing. In an ageing society, the European (Horizon2020) project SENIORS aims to improve the safe mobility of older road users, who have different transportation habits compared to other age groups. To increase their level of safe mobility by determining appropriate requirements for vehicle safety systems, the characteristics of current road traffic collisions involving the elderly and the injuries that they sustain need to be understood in detail. Hereby, the paper focuses on their traffic participation as pedestrian, cyclist or passenger car occupant. Following a literature review, several national and international crash databases and hospital statistics have been analysed to determine the body regions most frequently and severely injured, specific injuries sustained and types of crashes involved, always comparing older road users (65 years and more) with mid-aged road users (25-64 years). The most important crash scenarios were highlighted. The data sources included European statistics from CARE, data on national level from Germany, Sweden, Italy, United Kingdom and Spain as well as in-depth crash information from GIDAS (Germany), RAIDS (UK), CIREN and NASS-CDS (US). In addition, familiar hospital data from Germany (TraumaRegister DGU-®), Italy (Italian Register of Acute Traumas) and UK hospital statistics (TARN) were included in the study to gain further insight into specific injury patterns. Comprehensive data analyses were performed showing injury patterns of older road users in crashes. When comparing with mid-aged road users, all databases showed that the thorax body region is of particularly high importance for the older car occupant with injury severities of AIS 2 or AIS 3+, whereas the body regions lower extremities, head and thorax need to be considered for the older pedestrians and cyclists. Besides these comparisons, the most frequent and severe top 5 injuries were highlighted per road user group. Further, the most important crash configurations were identified and injury risk functions are provided per age group and road user group. Although several databases have been analysed, the picture on the road safety situation of older road users in Europe was not complete, as only Western European data was available. The linkage between crash data and hospital data could only be made on a general level as their inclusion criteria were quite different.
Supported by field accident data and monitoring results of European Regulation (EC) No. 78/2009, recent plans of the European Commission regarding a way forward to improve passive safety of vulnerable road users include, amongst other things, an extension of the head test area. The inclusion of passive cyclist safety is also being considered by Euro NCAP. Although passenger car to cyclist collisions are often severe and have a significant share within the accident statistics, cyclists are neither considered sufficiently in the legislative nor in the consumer ratings tests. Therefore, a test procedure to assess the protection potential of vehicle fronts in a collision with cyclists has been developed within a current research project. For this purpose, the existing pedestrian head impact test procedures were modified in order to include boundary conditions relevant for cyclists as the second big group of vulnerable road users. Based on an in-depth analysis of passenger car to cyclist accidents in Germany the three most representative accident constellations have been initially defined. The development of the test procedure itself was based on corresponding simulations with representative vehicle and bicycle models. In addition to different cyclist heights, reaching from a 6-year-old child to a 95%-male, also four pedal positions were considered. By reconstruction of a real accident the defined simulation parameters could be validated in advance. The conducted accident kinematics analysis shows for a large portion of the constellations an increased head impact area, which can reach beyond the roof leading edge, as well as high average values for head impact velocity and angle. Based on the simulation data obtained for the different vehicle models, cyclist-specific test parameters for impactor tests have been derived, which have been further examined in the course of head and leg impact tests. In order to study the cyclist accident kinematics under real test conditions, different full scale tests with a Polar-II dummy positioned on a bicycle have been conducted. Overall, the tests showed a good correlation with the simulations and support the defined boundary test conditions. Typical accident scenarios and simulations reveal higher head impact locations, angles and velocities. An extended head impact area with modified test parameters will contribute to an improved protection of vulnerable road users including cyclists. However, due to significantly differing impact kinematics and postures between the lower extremities of pedestrians and cyclists, these injuries cannot be addressed by the means of current test tools such as the flexible pedestrian legform impactor FlexPLI. Based on the findings obtained within the project as well as the existing pedestrian protection requirements a cyclist protection test procedure for use in legislation and consumer test programmes has been developed, whose requirements have been transferred into a corresponding test specification. This specification provides common head test boundary conditions for pedestrians and cyclists, whereby the existing requirements are modified and two parallel test procedures are avoided.