Detection and Categorization of Altercontrol. Phase 2 Report to BMW on a Methodical Approach for the Engineering of Driver Assistance Systems
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2001-08-01
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Abstract:A concept is developed and demonstrated for measuring normal driving behavior in a specialized way that reveals the contrast between human preferences in vehicle control and the functionality of any given driver assistance system (DAS). The concept basically distinguishes the DAS-controlled domain from all other portions of the driving task which concern the driver. The term "Altercontrol" has been coined to define the other, alter, control agenda that is deemed appropriate by the driver. Using the example case of Stop & Go Adaptive Cruise Control (ACC) as the DAS function in question, the method of Altercontrol detection was applied over approximately 400 krn of manual driving on a mixed route of motorways and surface streets. The reference model of a simple headway controller ran in the background while the instrumented vehicle was driven normally by a layperson. The test results showed 130 distinct incidents of Altercontrol (as opposed to ACC-like headway control) that were employed during the test drives. Each incident was characterized by the range-rate zone of its occurrence, the apparent control tactic employed by the driver, and the time duration over which the Altercontrol state prevailed. A categorization scheme is presented by which all Altercontrol of this kind falls into one of five cells of a matrix relating the type of prevailing "conflict" to the polarity of the headway-keeping "error" that was seen as a difference relative to strict headway-control rules. The conflicts range from benign discretionary controls to safety-critical action.
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