Steering wheel vibration reduction method, system and device in electric power steering system

Abstract

The invention relates to a method, a system and a device for reducing steering wheel vibrations in an electric steering system. Specifically, methods and systems are provided for suppressing steering wheel vibrations generated by periodic disturbances in a vehicle steering system. An exemplary method to reduce the steering wheel vibrations caused by periodic disturbances comprises determining a total torque attributable to the periodic disturbances in the steering system, determining a desired amount of suppression of the vibrations on the steering wheel, determining an offset torque based on the total torque and the desired amount of suppression, and generating a motor command signal in a manner that is influenced by the offset torque. The motor control command signal is provided for an electric motor which is combined with the steering wheel and / or vehicle tires, and the motor control command signal affects the torque applied by the motor in order to assist the steering of the vehicle tires from the steering wheel in such a way that the vibrations conveyed to the steering wheel attenuates the desired amount.

Description

[0001] Cross References to Related Applications [0002] This application is a continuation-in-part of Application Serial No. 12 / 882,852, filed September 15,2010. technical field [0003] Embodiments of the present invention relate generally to electric power steering (EPS) systems, and more particularly, to techniques for reducing periodic steered wheel vibration (SWV) that occurs in EPS systems. Background technique [0004] Electric power steering (EPS) systems use an electric motor that can be coupled directly to the steering gear or steering column to reduce driver effort in steering the vehicle. To explain further, during operation of the vehicle, the driver applies force to the steering wheels (SW) in an effort to steer the vehicle. This causes "driver torque" to be applied to the shaft coupled to SW. The torque sensor detects the torque applied to the steering column by the driver and communicates this information to the electronic control unit. The ECU generates ...

AI Technical Summary

Problems solved by technology

In vehicles implementing electric power steering (EPS), EPS control algorithms have been developed that allow active SWV suppression methods to be implemented, but these algorithms may be more expensive and require new hardware and / or wiring, or they may not be effective inhibition

These algorithms may also interfere with normal driving operation (i.e., affect the driver's perception of steering performance) and / or make the system less stable by generating large aperiodic SWV on rough roads or implementing vibration-limited cycle conditions (sense of vibration)

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