US 12,306,061 B2
Method for monitoring the balancing of the wheels of a motor vehicle
Fabien Deleplanque, Toulouse (FR); Xavier Rolland, Toulouse (FR); and Nicolas Guinart, Toulouse (FR)
Assigned to Continental Automotive Technologies GmbH, Hannover (DE)
Appl. No. 18/708,076
Filed by Continental Automotive Technologies GmbH, Hannover (DE)
PCT Filed Nov. 9, 2022, PCT No. PCT/EP2022/081240
§ 371(c)(1), (2) Date May 7, 2024,
PCT Pub. No. WO2023/083854, PCT Pub. Date Sep. 19, 2023.
Claims priority of application No. 2112066 (FR), filed on Nov. 15, 2021.
Prior Publication US 2025/0110005 A1, Apr. 3, 2025
Int. Cl. G01M 1/28 (2006.01)
CPC G01M 1/28 (2013.01) 11 Claims
OG exemplary drawing
 
1. A method for monitoring the balancing of the wheels of a motor vehicle, said motor vehicle comprising:
a first wheel unit that is mounted on an associated first wheel of the motor vehicle and that comprises a first computer and a first accelerometer, the first wheel unit being designed to supply a first raw acceleration signal based on a plurality of first samples of radial acceleration values of the first wheel, and
a second wheel unit that is mounted on an associated second wheel of the motor vehicle and that comprises a second computer and a second accelerometer, the second wheel unit being designed to supply a second raw acceleration signal based on a plurality of second samples of radial acceleration values of the second wheel, the method comprising:
a step of measuring noise that comprises at least:
a modeling phase that consists of modeling a first sinusoidal theoretical acceleration signal of the first wheel and a second sinusoidal theoretical acceleration signal of the second wheel,
a noise-measuring phase that consists, for the first wheel, of calculating the difference between the value of each sample of the first raw acceleration signal and a corresponding theoretical value of the first theoretical acceleration signal, then of measuring a first standard deviation for the calculated differences, and, for the second wheel, of calculating the difference between the value of each sample of the second raw acceleration signal and a corresponding theoretical value of the second theoretical acceleration signal, then of measuring a second standard deviation for the calculated differences,
a first step of calculating reference averages that is carried out following a repetition of the noise-measuring step in order to obtain a minimum number of first standard deviations and of second standard deviations and that consists of calculating a first reference average of said first standard deviations and a second reference average of said second standard deviations,
a second step of calculating current averages that is carried out following a repetition of the noise-measuring step in order to obtain a minimum number of first standard deviations and of second standard deviations and that consists of calculating a first current average of said first standard deviations and a second current average of said second standard deviations, and
a diagnostic step that aims to calculate a first variation between the first current average and the first reference average and a second variation between the second current average and the second reference average and that aims to analyze said calculated variations in order to detect a possible relative unbalance of said wheels.