Reducing The Effects Of Vibrations In An Electric Power Steering (EPS) System
First Claim
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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;
(b) identifying the periodic content of the measured vibration;
(c) determining a vibration correction from the periodic content; and
(d) driving an electric motor according to the vibration correction, wherein the vibration correction mitigates the effect of the measured vibration.
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Abstract
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.
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Citations
18 Claims
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1. A method for use with an electric power steering (EPS) system, comprising the steps of:
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(a) measuring a vibration in a part of the EPS system, wherein the measured vibration includes periodic and non-periodic content; (b) identifying the periodic content of the measured vibration; (c) determining a vibration correction from the periodic content; and (d) driving an electric motor according to the vibration correction, wherein the vibration correction mitigates the effect of the measured vibration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An electric power steering (EPS) system for use with a vehicle, comprising:
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a steering connection assembly; an electric motor being coupled to the EPS system to provide power assistance to supplement a manual steering force; and an electronic controller having a first input that receives a first signal from a sensor coupled to the steering connection assembly, a second input that receives a second signal from a sensor coupled to a wheel assembly, and an output that provides a command signal to the electric motor, wherein the electronic controller uses the first and second signals to generate the command signal, and the command signal causes the electric motor to purposely introduce counter-acting vibrations into the EPS system.
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Specification