Identification of driver state for lane-keeping tasks: experimental results

In a companion paper (Pilutti and Ulsoy, 1995),: an input-output system identification approach was proposed to monitor driver model parameter changes for use in vehicle active safety systems. The approach used vehicle lateral position as the input and steering wheel position as the output. In this paper, the approach is applied to data from twelve, two-hour highway driving runs conducted in a full-vehicle driving simulator. The identified model parameters (ζ, ω_n, and DC gain) do not exhibit the trends expected as lane keeping performance deteriorates; despite having acceptably white residuals. As an alternative, model residuals are compared in a process monitoring approach using a model fit to an early portion of the two-hour driver run. Model residuals show the expected trends and have potential in serving as the basis for a driver state monitor