Method of providing a scenario-based overlay torque request signal in a road vehicle steer torque manager

Abstract

Disclosed is a method of providing a scenario-based overlay torque request signal in a steer torque manager () during driver-override of an auxiliary steering assistance system () function in a road vehicle () having an EPAS system (). The steer torque manager () has a wheel angle controller () for providing an assistance torque request related signal, and a driver-in-the-loop functionality () for determining driver-override and providing a driver-override related signal. The method comprises receiving signals related to: assistance torque request; driver-override; road vehicle velocity; steering pinion angle; distance to an adjacent lane marker (); and distance to an adjacent potential threat object (), and producing, from the received signals, during ongoing driver-override, a signal representative of a resistance torque request corresponding to one of a finite number of pre-defined scenarios for different signal combinations, and producing the scenario-based steering wheel overlay torque request signal through combining the assistance torque request and the resistance torque request signals.