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Untersuchung des Zusammenwirkens zwischen dem Fahrer und einem ACC-System in Grenzsituationen

Study of drivers' co-operation with an ACC system in borderline situations
: Nirschl, G.; Kopf, M.

VDI-Gesellschaft Fahrzeug- und Verkehrstechnik; Verein Deutscher Ingenieure e.V. -VDI-, Düsseldorf:
Der Mensch im Verkehr : Tagung München, 30. und 31. Januar 1997
Düsseldorf: VDI-Verlag, 1997 (VDI-Berichte 1317)
ISBN: 3-18-091317-7
Tagung Der Mensch im Verkehr <1997, München>
Fraunhofer IITB ( IOSB) ()
ACC; adaptive cruise control; automation; Automatisierung; driver assistance system; driver car interaction; driver modelling; Ergonomie; ergonomy; Fahrer-Fahrzeug-Interaktion; Fahrerassistenzsystem; Fahrermodellierung

Drivers' co-operation with an ACC system (ACC = Adaptive Cruise Control) for autonomous speed and distance control was studied in real traffic in borderline situations. Borderline situations originate from normal traffic situations by failures from the technical system or from the driver (e.g. erreneous or incomplete information perception, wrong internal system model) or by unforeseen changes of the external situation (e.g. sudden sheering-in of other vehicles). Based on a conceptual clarification of the borderline situation notion by means of an interaction model, experimental trials with test vehicles and subjects were specified. 3 ACC versions (soft, medium, hard) were included, which principally differed in the limitation of the deceleration rate at system intervention (-0,5 m/s2, -1 m/s2, -3 m/s2) and in the time-headway (2,1 s, 1,8 s, 1,5 s). In the experiments, subjects were observed when passing "ACC situations" (following and approaching situations at various `critical` level s) provocated in real highway traffic. Driving data were recorded as well as video data. Additionally, subjective judgements of the ACC situations were requested from the subjects. The main goal of the study was to investigate the consequences of various limitations of the ACC's braking strength when intervening in ACC situations with regard to the drivers' behaviour, their subjective judgement of risk, controllability, safety and comfort. Especially the time course of such parameters, as well as the development of subjective preferences relating to the various ACC versions, were of interest.