Reducing the effects of vibrations in an electric power steering (EPS) system

摘要

The system and method described herein can be used to reduce the effects of periodic vibrations in an electric power steering (EPS) system for a vehicle, particularly, those that can lead to smooth road shake (SRS), torsional nibble, and/or other undesirable conditions. According to an exemplary embodiment, an electric motor is used to purposely generate counter-acting vibrations in the EPS system to cancel out the periodic vibrations generated by the wheel assemblies or corners.

主权项

1. A method for use with an electric power steering (EPS) system, comprising the steps of:
(a) measuring a vibration in a part of the EPS system, wherein the measured vibration includes periodic and non-periodic content and is measured by a sensor coupled to the part of the EPS system being vibrated; (b) identifying the periodic content of the measured vibration by evaluating the measured vibration over a number of wheel revolutions and extracting the periodic content from the non-periodic content of the measured vibration; (c) determining a vibration correction from the periodic content extracted from the non-periodic content of the measured vibration; and (d) driving an electric motor according to the vibration correction, wherein the vibration correction mitigates the effect of the measured vibration.