Method for determining assist torque offset and system using same

摘要

A vehicle having a driving assist system and an electric power assist steering system coupled to the driving assist system. The driving assist system transmits an assist torque request for reception by the electric power assist steering system for enabling the electric power assist steering system to adjust its outputted assist torque to accommodate requirements of the driving assist system. The assist torque request specifies a requested additional assist torque required by the driving assist system from the electric power assist steering system. In response to receiving the assist torque request, the electric power assist steering system performs an operation for determining a column torque offset as a function of both a force being applied by a driver of the vehicle on a steering column of the vehicle and the requested additional assist torque required by the driving assist system.

主权项

1. A method for determining information used in operating an electric power assist steering system of a vehicle having a set of instructions tangibly embodied on a non-transitory processor-readable medium by at least one data processing device, comprising:
receiving a torque assist request defined by additional assist torque required by a driving assist system; determining a current column torque defined by a torsional force being applied by a driver on the steering column of the vehicle; determining an assist torque corresponding to the current column torque using an inverse assist torque data structure and a vehicle speed; determining a total required assist torque as a sum of the current column torque and the requested additional torque; determining a total column torque corresponding to the total required assist torque using the inverse assist torque data structure determining a column torque offset as a difference between the first column torque and the second column torque causing the electric power assist steering system to provide an outputted assisted torque derived from a normal assist torque data structure based on the total column torque and a vehicle speed.