Study on Driver-Dependent Stabilization Capabilities for Safe Chassis Control with Steer By Wire Volkswagen AG

Format:

Book

Conference/Event

Author/Creator:

Birkemeyer, Janick, author.

Contributor:

Borkowski, Lukas

Müller, Steffen

Naidu P.M, Tarun

Conference Name:

2025 Stuttgart International Symposium (2025-07-02 : Stuttgart, Germany)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2025

Summary:

Steer-by-wire actuators represent a transformative advancement in chassis control, opening up new potential for optimizing driving behavior across the entire range of driving dynamics - including driver-dependent automatic counter steering in critical driving situations. However, from a functional safety perspective, the increased potential also introduces new risks with respect to possible system failures. To mitigate these risks, sophisticated monitoring functions are essential to ensure vehicle controllability at all times. Current research approaches for monitoring functions use safe driving envelopes. This set of safe driving states is often found by open-loop simulations, which provide a phase portrait of the nonlinear system under control and from which stability limits can be derived. However, it remains open how these open-loop stability limits correspond to the stabilization capability of a real human driver in the loop. And secondly, how these closed-loop stability limits might change depending on the driving skill. To answer these questions, the paper presents the results of a subject study conducted in a semi-dynamic driving simulator with 52 participants. The study investigated the stabilization behavior of drivers after a sudden and unexpected disturbance. The disturbance leads to oversteering of the vehicle with varying criticality, allowing an analysis of the driver's behavior over a wide range of the phase portrait of side slip angle and its derivative. Based on this data, the stabilization performance of groups of drivers with different skill levels, from beginner to expert, is compared to each other and to the model-based open-loop limits. The results show that the open-loop stability limits provide a good yet conservative estimate for normal drivers and can therefore serve as an envelope for functional safety approaches. At the same time, the research shows that an adjustment may be necessary or useful for beginners and experts: While the open-loop limits determined by simulation contain potentially uncontrollable driving states for beginners, experts are able to shift these limits towards more dynamic driving states by exploiting their driving skills, thus allowing a more liberal application of chassis controllers

Notes:

Vendor supplied data

Publisher Number:

2025-01-0276

Access Restriction:

Restricted for use by site license