Method of compensating for sensor tolerances

Patent metadata

Field	Value
Publication number	US-12247996-B2
Application number	US-202218082672-A
Country	US
Kind code	B2
Filing date	Dec 16, 2022
Priority date	Dec 16, 2021
Publication date	Mar 11, 2025
Grant date	Mar 11, 2025

Abstract

A method for compensating sensor tolerances of accelerometers of a vehicle. The method includes following steps: recording of measurement signals of at least three similarly oriented accelerometers, calculation of an acceleration (a b,z ) at a reference position in the spatial direction, which corresponds to the orientation of the accelerometers, low-pass filtering of the measurement signals, determination of tolerance parameters (c x , c y , c z ) of each sensor via an optimization method with the aid of the calculated acceleration (a b,z ) at the reference position, and calculation of the adjusted measurement signals from the recorded measurement signals and the tolerance parameters (c x , c y , c z ).

First claim

What is claimed is:

1. A method of compensating for sensor tolerances of accelerometers of a vehicle, said method comprising the following steps:
(A) recording measurement signals of at least three similarly oriented accelerometers,
(B) calculating an acceleration (a b,z ) at a reference position in a spatial direction corresponding to an orientation of the accelerometers,
(C) low-pass filtering the measurement signals,
(D) determining tolerance parameters (c x , c y , c z ) of each accelerometer via an optimization method with the aid of the calculated acceleration (a b,z ) at the reference position, and
(E) calculating adjusted measurement signals from the recorded measurement signals and the tolerance parameters.

2. The method according to claim 1 , wherein each of the tolerance parameters (c x , c y , c z ) corresponds to one of the tolerances of one of the accelerometers in the spatial direction.

3. The method according to claim 1 , wherein a rigid body movement of a vehicle structure of the vehicle is used in order to determine the tolerance parameters (c x , c y , c z ).

4. The method according to claim 1 , wherein, the calculating the acceleration (a b,z ) at the reference position, a yawing rate (ω z ) at the reference position is measured by a sensor.

5. The method according to claim 1 , further comprising using a least-squares-fault method in order to determine the tolerance parameters (c x , c y , c z ).

6. A computer program product comprising a non-transitory computer readable storage medium storing computer instructions which, when executed by a computer, cause the computer to perform a method of compensating for sensor tolerances of accelerometers of a vehicle, the method comprising the steps of:
(A) recording measurement signals of at least three similarly oriented accelerometers,
(B) calculating an acceleration (a b,z ) at a reference position in a spatial direction corresponding to an orientation of the accelerometers,
(C) low-pass filtering the measurement signals,
(D) determining tolerance parameters (c x , c y , c z ) of each accelerometer via an optimization method with the aid of the calculated acceleration (a b,z ) at the reference position, and
(E) calculating adjusted measurement signals from the recorded measurement signals and the tolerance parameters.

7. A vehicle comprising the computer program product of claim 6 .

Assignees

• Porsche Ag

Inventors

• Eisenbarth Markus
• Caredda David

Classifications

• B60W50/0205 Primary

  Diagnosing or detecting failures; Failure detection models · CPC title

• B60W40/109

  Lateral acceleration · CPC title

• B60W40/107

  Longitudinal acceleration · CPC title

• B60W2050/0056

  Low-pass filters · CPC title

• B60W2420/905

  the sensor being an xyz axis sensor · CPC title