Method for detecting an imbalance of a vehicle wheel while the vehicle is rolling

Patent metadata

Field	Value
Publication number	US-2016209291-A1
Application number	US-201415024170-A
Country	US
Kind code	A1
Filing date	Sep 12, 2014
Priority date	Sep 24, 2013
Publication date	Jul 21, 2016
Grant date	—

Abstract

A method and device detect the imbalance of a vehicle wheel. The method includes measuring a rotation speed of the wheel while the vehicle is moving, and calculating a filtered value by applying at least one step of band-pass filtering to the measured rotation speed value of the wheel. A position of a pass-band of the band-pass filtering step is offset while moving as a function of the rotation speed of the wheel.

First claim

1 - 11 . (canceled)

12 . A method of detecting the imbalance of a vehicle wheel, comprising:
measuring a rotation speed of the wheel while the vehicle is moving; calculating a filtered value by applying at least one step of band-pass filtering to the measured rotation speed value of the wheel, wherein a position of a pass-band of the band-pass filtering step is offset while moving as a function of the rotation speed of the wheel.

13 . The detection method as claimed in claim 12 , further comprising:
calculating a variance value representative of a statistical variance of the filtered value; and comparing the variance value to a variance threshold.

14 . The detection method as claimed in claim 13 , wherein the variance value is calculated by applying a step of low-pass filtering to the absolute value of a difference between the filtered value and a mean filtered value, the mean filtered value being a result of low-pass filtering of the filtered value.

15 . The detection method as claimed in claim 13 , wherein a result of the comparing the variance value to the variance threshold is taken into account only during phases of movement in which a speed of the vehicle is considered as stabilized.

16 . The detection method as claimed in claim 13 , further comprising:
applying a first step of low-pass filtering to a value delivered by a wheel speed sensor to obtain a wheel rotation speed to which the band-pass filtering step is then applied.

17 . The detection method as claimed in claim 13 , further comprising:
applying a final step of low-pass filtering to the variance value to obtain a filtered variance value that is compared to the variance threshold.

18 . The detection method as claimed in claim 12 , wherein the band-pass filtering step is effected by means of a discrete band-pass filter characterized by five variable coefficients, the five coefficients being calculated as a function of three constant coefficients and a rotation speed of the wheel.

19 . The detection method as claimed in claim 13 , wherein the detection method is applied to monitoring of a level of inflation of the wheels of the vehicle.

20 . A device for detecting the imbalance of a motor vehicle wheel, comprising:
a sensor of a rotation speed of a wheel; and a calculation unit to calculate an imbalance criterion for the wheel, wherein the calculation unit is configured to effect at least one step of band-pass filtering of a speed sensor signal of the sensor, a position of a pass-band being offset while moving as a function of the rotation speed of the wheel.

21 . The device as claimed in claim 20 , wherein the calculation unit is configured, during at least some steps of movement of the vehicle, to compare to a threshold a criterion value produced by filtering including the band-pass filtering step.

22 . A vehicle, comprising:
a detection device as claimed in claim 20 .

Assignees

• Renault Sas

Inventors

• Pita-Gil Guillermo
• Saint-Loup Philippe
• Davins-Valldaura Joan

Classifications

• G01M1/28 Primary

  with special adaptations for determining imbalance of the body in situ, e.g. of vehicle wheels · CPC title