Haptic shared steering control with an adaptive level of authority based on time-to-line crossing

Zwaan, Hugo; Petermeijer, S.M.; Abbink, D.A.

doi:10.1016/j.ifacol.2019.12.085

Haptic shared steering control with an adaptive level of authority based on time-to-line crossing

Title

Haptic shared steering control with an adaptive level of authority based on time-to-line crossing

Author

Zwaan, Hugo (Student TU Delft)
Petermeijer, S.M. (TU Delft Human-Robot Interaction)
Abbink, D.A. (TU Delft Human-Robot Interaction)

Date

2019

Abstract

Traditional driver-automation interaction trades control over the vehicle back and forth between driver and automation. Haptic shared control offers an alternative by continuously sharing the control through torques on the steering wheel and pedals. When designing additional feedback torques, part of the design choice lies in the stiffness around the neutral steering point: also called the Level of Haptic Authority (LoHA), which is usually static and tuned to balance safety benefits (better at high LoHA) with conflicts torques in case of different intentions between automation and driver (higher conflict torques with increased LoHA). In this paper we explore the idea of situation-adaptive LoHA: in this case during lane-keeping by changing the LoHA based on time to lane crossing (TLC). Consequently, when safety margins are high (e.g., when driving on a wide road) the LoHA is low, but the LoHA would only increase when safety margins decrease. We propose two alternative design approaches to apply the LoHA: symmetrically and asymmetrically (i.e., only increase of LoHA in the direction of the low TLC). We compared these design in an explorative driving simulator study (n=14) to driving with two static LoHA designs (low and high). We found that compared to the high LoHA controller, both adaptive LoHA controllers designs resulted in similar safety margins, but at decreased conflict torques. Hence, a TLC-based adaptive LoHA controller seems to be an effective approach to mitigate conflicts while maintaining the safety benefits associated with HSC.

Subject

Haptic Shared Control
Adaptive
Level of Haptic Authority
Human-Machine interaction
driving simulator

To reference this document use:

http://resolver.tudelft.nl/uuid:4e1c212d-616a-4a3d-856d-4d9bc5661025

DOI

https://doi.org/10.1016/j.ifacol.2019.12.085

ISSN

1474-6670

Source

IFAC-PapersOnLine, 52 (19), 49-54

Event

14th IFAC Symposium on Analysis, Design, and Evaluation of Human Machine Systems, HMS 2019, 2019-09-16 → 2019-09-19, Tallinn, Estonia