Method of sampling acceleration measurements of a motor vehicle wheel

Patent metadata

Field	Value
Publication number	US-9459275-B2
Application number	US-201013825677-A
Country	US
Kind code	B2
Filing date	Oct 8, 2010
Priority date	Oct 8, 2010
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

A method of sampling acceleration measurements of a wheel ( 10, 20, 30, 40 ) of a motor vehicle ( 1 ), the vehicle ( 1 ) having a tire pressure monitoring system, and being fitted with an electronic central unit ( 2 ), each of the wheels ( 10, 20, 30, 40 ) including: a wheel unit (A, B, C, D) fixed to a rim (J 10 , J 20 , J 30 , J 40 ) of radius R and having at least one accelerometer, measuring the radial acceleration F 1 of the wheel, and a microprocessor; the method including the measurement, for each wheel revolution, at given time intervals (T measurement ), of a number (N) of radial acceleration values by the radial accelerometer. The method proposes: that a minimum number (N) of acceleration measurements be fixed per wheel revolution, and that the time intervals (T measurement ) between two radial acceleration measurements be determined by element of the following relation:

T
measurement

=

2
⁢

π
·

R

F
1

N

First claim

The invention claimed is:

1. A method of sampling acceleration measurements of a wheel ( 10 , 20 , 30 , 40 ) of a motor vehicle ( 1 ), said vehicle ( 1 ) having a tire pressure monitoring system and being fitted with an electronic central unit ( 2 ), each of said wheels ( 10 , 20 , 30 , 40 ) including:
a wheel unit (A, B, C, D) fixed to a rim (J 10 , J 20 , J 30 , J 40 ) of radius R and having at least one accelerometer, measuring the radial acceleration F 1 of the wheel, and a microprocessor,
said method comprising:
measuring, for each wheel revolution, at given time intervals (T measurement ), a number (N) of radial acceleration values by the accelerometer;
fixing a minimum number (N) of acceleration measurements per wheel revolution;
determining the time intervals (T measurement ) between two radial acceleration measurements, using the following relation:

T
measurement

=

2
⁢

π
·

R

F
1

N

;

instructing the accelerometer to make the radial acceleration measurements at the determined time intervals (T measurement ); and
the wheel unit receiving and processing the radial acceleration measurements and sending the processed radial acceleration measurements to the electronic central unit.

2. The location method as claimed in claim 1 , wherein the accelerometer is a radial accelerometer.

3. The location method as claimed in claim 1 , wherein, for a given rim radius (R), the number of acceleration measurements per wheel revolution (N) is fixed at 15 .

4. The location method as claimed in claim 1 , wherein, for an estimated rim radius (R), the number of acceleration measurements per wheel revolution (N) is greater than 15.

5. The location method as claimed in claim 1 , wherein the acceleration measurements are filtered, by a high-pass and/or a low-pass filter, in order to eliminate the measurements caused by parasitic noise.

6. A device for sampling acceleration measurements of a wheel ( 10 , 20 , 30 , 40 ) of a motor vehicle ( 1 ), said vehicle ( 1 ) having a tire pressure monitoring system, and being fitted with an electronic central unit ( 2 ), each of said wheels including:
a wheel unit (A, B, C, D) fixed to a rim (J 10 , J 20 , J 30 , J 40 ) of radius R and having at least one accelerometer, measuring radial acceleration F 1 of the wheel, and a microprocessor,
the accelerometer being configured to measure, for each wheel revolution, at given time intervals (T measurement ), a number (N) of radial acceleration values by the accelerometer;
said device comprising:
means for fixing a minimum number (N) of acceleration measurements per wheel revolution; and
means for determining time intervals (T measurement ) between two radial acceleration measurements, using the following relation:

T
measurement

=

2
⁢

π
·

R

F
1

N

;

wherein the accelerometer makes the radial acceleration measurements at the determined time intervals (T measurement ) from the means for determining time intervals; and
wherein the wheel unit receives and processes the radial acceleration measurements from the accelerometer and sends the processed radial acceleration measurements to the electronic central unit.

7. The location method as claimed in claim 2 , wherein, for a given rim radius (R), the number of acceleration measurements per wheel revolution (N) is fixed at 15 .

8. The location method as claimed in claim 2 , wherein, for an estimated rim radius (R), the number of acceleration measurements per wheel revolution (N) is greater than 15.

9. The location method as claimed in claim 2 , wherein the acceleration measurements are filtered, by a high-pass and/or a low-pass filter, in order to eliminate the measurements caused by parasitic noise.

10. The location method as claimed in claim 3 , wherein the acceleration measurements are filtered, by a high-pass and/or a low-pass filter, in order to eliminate the measurements caused by parasitic noise.

11. The location method as claimed in claim 4 , wherein the acceleration measurements are filtered, by a high-pass and/or a low-pass filter, in order to eliminate the measurements caused by parasitic noise.

Assignees

• Guinart Nicolas
• Continental Automotive France
• Continental Automotive Gmbh

Inventors

• Guinart Nicolas

Classifications

• B60C23/0488

  Movement sensor, e.g. for sensing angular speed, acceleration or centripetal force · CPC title

• B60C23/0489

  for detecting the actual angular position of the monitoring device while the wheel is turning · CPC title

• B60C23/0479

  Communicating with external units being not part of the vehicle, e.g. tools for diagnostic, mobile phones, electronic keys or service stations · CPC title

• B60C23/0416 Primary

  allocating a corresponding wheel position on vehicle, e.g. front/left or rear/right · CPC title

• B60C23/04

  mounted on the wheel or tyre · CPC title