AUDI

AUDI

Germany

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The AUDI AG stands for sporty vehicles, high build quality and progressive design – for “Vorsprung durch Technik.” The Audi Group is among the world’s leading producers of premium cars.


To play an instrumental role in shaping the transformation as we head into a new age of mobility the Company is implementing its strategy step by step.

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See AUDI news on FISITA Spotlight

FISITA World Congress starts tomorrow, 25 years after it was last held in Prague

FISITA World Congress 2021 starts tomorrow (Tue 14 Sep). It was previously in Prague in 1996 - this Spotlight looks back to 1996 and beyond

13 Sept 2021

Expectations and Hopes of the Congress President – Jan Macek sets the scene for this week

Jan Macek to welcome all to the 38th FISITA World Congress. Macek looks at the challenge of improving mobility while reducing emissions

13 Sept 2021

Congress: Blind Spot Reduction Effects on Behaviour & Opinions of Drivers Using Digital Wing Mirrors

Floris van Oosten to explain how blind spot reduction by optimal location of digital wing mirrors affects behaviour & opinions of drivers

9 Sept 2021

Congress: Numerical and physical experiments on the passby noise of the iShare

Babis Tsimis to give an overview of experimental and numerical work performed in the aeroacoustics field on passby noise of a compact car

9 Sept 2021

See FISITA Library items from AUDI

F2020-VDC-041

Paper + Video

Mr. Fan Chang, AUDI AG / Technische Universität Dresden, GERMANY
Dipl.-Ing. Matthias Bayer, Chair of Automotive Engineering / Technische Universität Dresden, GERMANY
Dr.-Ing. Sebastiaan van Putten, Virtual Chassis, Concept Attributes and Functions / AUDI AG, GERMANY
Prof. Dr.-Ing. Günther Prokop, Dean of Faculty of Transport and Traffic Sciences / Technische Universität Dresden, GERMANY

Detail

The trends towards increasing popularity of high performance SUVs require a novel assessment of “trade-off” between driving dynamics and rollover stability, which represents a new challenge for chassis design in the concept phase of chassis development. However, the rollover behavior has been typically investigated by means of experimental test maneuvers with prototype vehicles, which require a large amount of resources, such as measuring equipment, outrigger and roof loading. Besides, measurement data with measurement errors do not always provide satisfactory results due to external disturbance factors, e.g. environmental temperature and road surface. By contrast, a simulation environment can rule out the part of the aforementioned disturbance factors by reproducible simulation maneuvers in order to reduce the development expenses and obtain a better understanding of the rollover behavior. Within a cooperation project between Audi AG (Germany) and TU Dresden (Germany) five previous works have focused on the vehicle modeling, model verification, validation, analysis methodology and physical effect chains analysis for rollover behavior. However, a study into existing literature reveals that the interaction between yaw instability and roll instability has not been investigated sufficiently to date. Especially the question arises, to what extent the oversteer tendency (lateral instability) affects the rollover behavior (roll instability). Therefore, this paper aims to analyze the motion couplings between yaw and roll dynamics to explain the interrelation between oversteer tendency and rollover behavior, using the developed nonlinear two-track model with full axle kinematics and compliance, a dynamic steering and a nonlinear tire model. Firstly, a new criterion to describe the dynamical oversteer tendency in the nonlinear limit range of driving dynamics has been defined, which can be regarded as a further development of the traditional definitions of oversteer tendency in the linear range. Secondly, the rollover criticality has been quantified by means of a new maneuver in order to gain a comprehensive comparison between different vehicle configurations. Subsequently, different chassis parameters of the reference vehicle have been varied to investigate the relationship between driving performance and rollover stability. Finally, the results of the study are interpreted and discussed. Through analysis in this paper, the driving dynamics both in the linear and nonlinear range are evaluated to identify the operation principles between dynamical oversteer tendency and the rollover behavior. Summarizing the acquired know-how together, recommendations for design targets in the early phase of chassis development are derived. Newsworthy: 1. A new criterion to describe the dynamical oversteer tendency in the nonlinear limit range of driving dynamics 2. Systematical investigation of the interaction between oversteer tendency and rollover behavior 3. Parameter study to build up the understanding of the nonlinear physical chains of rollover behavior

FISITA World Congress 2021

VDC - Vehicle Dynamics and Controls

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Analysis of Rollover Stability in Consideration of Dynamic Oversteer Tendency, F2020-VDC-041, FISITA World Congress 2021

F2020-PIF-057

Paper + Video

Mr. Thierry Mousel, IEE S.A., LUXEMBOURG
Mr. Peter Larsen, IEE S.A., LUXEMBOURG

Detail

The topic of children dying of heat stroke in vehicles has gained increasing attention in recent years. Euro NCAP has added Child Presence Detection on its Roadmap 2025, ASEAN NCAP has a similar initiative and the US Congress is currently debating a dedicated HOT CARS bill, with all initiatives aiming at reducing the risk of heat stroke fatalities in vehicles. In the US alone, there have been 849 known fatal incidents since 1998, with 2018 and 2019 having been record years with 53 respectively 52 children dying in hot cars. In-vehicle heat related fatalities occur almost anywhere in the world, and any vehicle category can be concerned. Recent child deaths in US school buses led to legal settlements exceeding 23 million dollars. About 75% of the children that die in vehicles are younger than 3 years. So, when thinking about a sensing solution that can detect their presence, one has to take into consideration that they are frequently sleeping. IEE has developed a radiofrequency-based sensing technology that is sensitive enough to detect the breathing motion of sleeping infants. After the driver locks the vehicle, the sensor typically detects presence in a few seconds. This presence information is then communicated to the vehicle, which can trigger and escalate various warnings, or initiate countermeasures, depending on its capabilities (visual/audible alerts, messages to smartphone, etc.). IEE offers two different sensing solutions to address the issue: - VitaSense: tailored for passenger cars, detects the presence of an unattended child (or animal) after the driver has left the vehicle. Serial development for market introduction late 2020. - LiDAS (Life Detection Assistance System): using a network of sensors for larger vehicles such a school bus. Retrofit solution tailored to the various needs of (school) bus fleet operators. US school districts are currently running test fleet pilot studies. Starting 2022, VitaSense can improve the Euro NCAP vehicle safety rating. Child Presence Detection will contribute with up to 4 points to the child safety category. The CPD protocol is currently under development, and a robust detection solution will be needed in order to get a significant fraction of the available points. Contrary to the known “check rear seat” alerts only assuming that there might be a child, VitaSense only triggers alerts if an occupant is actually detected, preventing a false positives perception or a habituation effect due to too frequent unnecessary alerts. LiDAS has been derived from the VitaSense concept, with the dedicated aim to be used in vehicles transporting larger numbers of children (large vans, school buses). There are numerous examples of children inadvertently being left on a bus or van after the driver left, even if drivers had the duty to check that the bus was empty before leaving. A network of sensors is installed above the seat benches, with the number of sensors adapted to the size of the vehicle. The sensing, notification strategy and data management can be adapted to the needs and preferences of the bus fleet operator.

FISITA World Congress 2021

PIF - Passive and Integral Safety

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Child Presence Detection: Sensing technology solutions to detect unattended children in passenger cars (VitaSense) and school busses (LiDAS), F2020-PIF-057, FISITA World Congress 2021