Gm Global Technolgoy Operations, Inc.

Theodore P Konieczny

Aaron Ronald

Scott P Sherman

Nathan M Picot

William F Dickson

A calibration system for an electric power steering system includes a hardware-in-loop (HIL) test fixture, and an electric power steering system mounted to the HIL test fixture. The electric power steering system includes a power steering rack, and an intermediate shaft (I-shaft) mechanically connected to the power steering rack. An electric motor is operatively connected to the HIL test fixture. A clutch assembly is operatively connected between the electric motor and the I-shaft. The clutch assembly is operable to selectively connect the electric motor with the I-shaft.

System and method for testing a hands-off clutch for a steering hardware-in-loop (HIL) system

A method of tuning a calibration table for an electric power steering system includes connecting the electric power steering system to an actuator machine, and communicating a control input from a vehicle simulator to the actuator machine. Input forces and steering angles are applied to the electric power steering system with the actuator machine, based on the control input. The electric power steering system is controlled with a steering controller, to apply a steering setting, i.e., and assistive torque. The steering controller uses the calibration table to define the steering setting, based on the applied input forces and steering angles. A steering torque in the electric power steering system generated in response to the applied steering setting is sensed, and communicated to the vehicle controller, thereby establishing a closed loop, feedback system. The calibration table may then be re-defined based on the sensed steering response for the applied input forces.

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Williamston, MI, United States of America

Theodore P Konieczny