Should Steering Settings be Changed by the Driver or by the Vehicle Itself?

Area of Science:

• Human-Computer Interaction
• Automotive Engineering
• Cognitive Psychology

Background:

• Modern vehicles feature advanced computerization, enabling dynamic adjustments to settings like steering gain (SG).
• The optimal control strategy for variable steering gain—driver-initiated versus automatic adaptation—remains undetermined for varying road conditions.

Purpose of the Study:

• To investigate whether steering gain mode changes should be driver-initiated or automatically controlled.
• To compare driver performance and subjective experience between fixed and variable steering gain systems.

Main Methods:

• A driving simulator study with 24 participants evaluating four conditions: fixed low gain (FL), fixed high gain (FH), machine-initiated (MI) automatic transitions, and driver-initiated (DI) transitions.
• Lane-keeping accuracy and subjective effort were measured across different road segments.

Main Results:

• Fixed high gain (FH) resulted in poorer lane-keeping and higher effort on straights compared to fixed low gain (FL), with the inverse true on curves.
• Machine-initiated (MI) transitions improved lane-keeping and reduced effort on curves compared to driver-initiated (DI) transitions.
• A significant number of participants expressed low preference for the machine-initiated (MI) system.

Conclusions:

• Variable steering gain (SG) systems are preferred by drivers and offer performance benefits over fixed gain systems.
• While automatic steering gain transitions can reduce driver effort, driver acceptance of machine-initiated control is not universal.
• The findings suggest a need for adaptive steering systems that balance automated adjustments with driver control and preference.