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Driver response to a lane-departure prevention system - Based on real-world traffic data

Linus Liljeblad
Göteborg : Chalmers tekniska högskola, 2015. Diploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden, ISSN 1652-8557; 2015:71, 2015.
[Examensarbete på avancerad nivå]

Today, there are commercially available cars with some kind of lane-departure prevention system, with the purpose of stopping the driver from unintentionally crossing the lane marker. The latest versions of the system does not only warn the driver, but is actually trying to steer the car back on the right track when the driver fails to steer the car sufficiently. The systems applies torque on the steering rack which then translates into the wheel as well as the steering wheel and effects both the driver and the car. The driver's reaction to this kind of intervention has been studied before in experiments but never investigated in real-world traffic data. This thesis describes a methodology to understand driver response to a lane-departure prevention system based on an analysis of real-world traffic data. As far as the author is aware, this type of analysis has never been done before, and therefore it constitutes an important part of the understanding of driver behaviour. The purpose was to develop a methodology that could describe the drivers reaction when external torque from the lane-departure prevention system was applied. The study show that it was possible to give a rather good description of how the driver reacts to an externally applied torque. A reaction was noticeable for almost every intervention when only looking at the torques in the system, but a distinct visible reaction was only noticeable in 11:6% and 19:1% of the initial (0 s{0:5 s) and whole intervention respectively. The difference in applied torque between the driver and the lane-departure prevention system also showed that the driver tends to take more control over the steering wheel when the duration of intervention was longer than 0:5 second, than when the intervention was shorter or in the initial phase of a longer intervention. The study further show that it was possible to describe and understand the movement of the steering wheel by analysing the steering wheel angle and its rate. Finally, the fraction of the driver reaction with respect to the other torques in the system that effects the steering could be calculated and analysed.

Nyckelord: Driver response, lane-departure prevention system

Publikationen registrerades 2015-09-24. Den ändrades senast 2016-01-12

CPL ID: 223161

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