Pressure measuring and inflation/deflation control system for tires

• US 20030234041A1
• Filed: 04/17/2003
• Published: 12/25/2003
• Est. Priority Date: 10/23/2000
• Status: Active Grant

• Current Assignee: Michelin Recherche et Technique SA (Compagnie Generale DES Etablissements Michelin SCA)
• Original Assignee: Michelin Recherche et Technique SA (Compagnie Generale DES Etablissements Michelin SCA)
• Inventors: Boulot, Jean-Francis
• Granted Patent: US 7,079,047 B2
• Time in Patent Office: Days
• US Class Current: 137/224
• CPC Class Codes: B60C 23/0408 transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
• CPC Class Codes: Y10T 137/36 With pressure-responsive pressure-control means

Abstract

A pressure measuring and inflation/deflation control system for tires, comprising:

a pressure sensor,

a pressure variation detector capable on the one hand of responding in a safety time interval to a substantially significant and rapid variation in the pressure inside the cavity of the tire, and on the other hand of acting on another element cooperating with said detector;

a management module, capable of receiving and processing informations provided by the pressure sensor on the one hand and on the other hand by the pressure variation detector and capable, on the basis of the information provided by the pressure variation detector, of actuating the shift from a so-called “normal” pressure measuring mode to a so-called “accelerated” measuring mode, or the shift from the “accelerated” mode to the “normal” mode.

Claims

1. A pressure measuring and inflation/deflation control system for tires, comprising:

a pressure sensor in fluid communication with the ambient pressure of the tire and capable of measuring this pressure;

a pressure variation detector capable of responding to a variation in pressure inside the cavity of the tire;

a management module, capable of receiving and processing informations provided by the pressure sensor on the one hand and on the other hand by the pressure variation detector and capable, on the basis of the information provided by the pressure variation detector, of actuating the shift from a so-called “

normal”

pressure measuring mode to a so-called “

accelerated”

measuring mode, or the shift from the “

accelerated”

mode to the “

normal”

mode.

2. A pressure measuring and inflation/deflation control system for tires according to claim 1, in which the “

accelerated”

mode is that in which the time interval between the measurements carried out by the pressure sensor is substantially shorter than in “

normal”

mode.

3. A pressure measuring and inflation/deflation control system for tires according to claim 2, in which the “

accelerated”

mode is that in which the time interval between the measurements carried out by the pressure sensor is substantially zero.

4. A pressure measuring and inflation/deflation control system for tires according to claim 1, in which the pressure variation detector is capable of providing a signal relating to the rate ζ

of pressure variation in the cavity of the tire.

5. A pressure measuring and inflation/deflation control system for tires according to claim 1, in which the pressure variation detector is of the piezoelectric type.

6. A pressure measuring and inflation/deflation control system for tires according to claim 5, in which the pressure variation detector comprises a casing provided with two chambers, insulated substantially from one another and separated by a piezoelectric type deformable membrane, a first chamber being subject to a reference pressure and the second being capable of being in fluid communication with the environment of the medium in which it is desired to effect monitoring, said deformable membrane adopting a given, substantially stable profile in the absence of a variation in the pressure differential between the two chambers, said membrane being adapted to become deformed so as to pass from a first profile to a second profile under the action of a pressure variation in said environment, the deformations thus produced allowing the generation of an electrical signal, the strength of which is related to the degree of deformation.

7. A pressure measuring and inflation/deflation control system for tires according to claim 6, in which the reference pressure corresponds to a vacuum.

8. A pressure measuring and inflation/deflation control system for tires according to claim 1, in which the environment of the medium in which it is wished to perform monitoring corresponds to the pressure inside the cavity of the tire.

9. A pressure measuring and inflation/deflation control system for tires according to claim 1, in which the pressure variation detector is of the aneroid type.

10. A pressure measuring and inflation/deflation control system for tires according to claim 9, in which the pressure variation detector comprises an aneroid capsule provided with a calibrated orifice in fluid communication with the environment of the medium in which it is desired to effect detection, said capsule being deformable under the action of a variation in the pressure of said environment.

11. A pressure measuring and inflation/deflation control system for tires according to claim 10, in which an electronic measuring or detecting device cooperates with said capsule in such a way that the deformations thus produced allow actuation of said electronic device.

12. A pressure measuring and inflation/deflation control system for tires according to claim 11, in which said electronic device is a threshold detector, calibrated in such a way as to transmit an electrical signal when a pre-established minimum threshold for deformation of the membrane is reached.

13. A pressure measuring and inflation/deflation control system for tires according to claim 11, in which said electronic device is a transducer allowing generation of an electrical signal, the strength of which is related to the degree of deformation.

14. A pressure measuring and inflation/deflation control system for tires according to claim 10, in which a mechanical measuring or detecting member cooperates with said capsule in such a way that the deformations thus produced allow actuation of said mechanical member.

15. A pressure measuring and inflation/deflation control system for tires according to claim 14, in which said mechanical member is a threshold detector, calibrated in such a way as to transmit an electrical signal when a pre-established minimum threshold for deformation of the membrane is reached.

16. A pressure measuring and inflation/deflation control system for tires according to claim 14, in which said mechanical member cooperates with a rheostat capable of generating an electrical signal, the strength of which is related to the degree of deformation.

17. A pressure measuring and inflation/deflation control system for tires according to claim 10, in which the calibrated orifice is a capillary tube.

18. A pressure measuring and inflation/deflation control system for tires according to of claim 1, also comprising an information transmission module capable of transmitting information from a rotating part to a fixed part of the vehicle.

19. A pressure measuring and inflation/deflation control system for tires according to claim 1, comprising, for the non-rotating part of the vehicle, at least one data receiving means.

20. A tire comprising a pressure measuring and inflation/deflation control system for tires according to claim 1.

21. A tire according to claim 20, in which the pressure measuring and inflation/deflation control for tires is arranged in a wall.

22. A rim comprising a pressure measuring and inflation/deflation control system for tires according to claim 1.

23. A pressure measuring and inflation/deflation control system for tires according to claim 1, comprising at least one means of transmitting data to a non-rotating part of the vehicle.

24. A method of measuring pressure and controlling inflation/deflation of tires, consisting in:

effecting measurements of the pressure of a tire using a pressure sensor in fluid communication with the ambient pressure of the tire and capable of measuring said pressure, said measurements being performed at time intervals corresponding either to a so-called “

normal”

measuring mode or a so-called “

accelerated”

measuring mode;

monitoring the tire pressure variations liable to occur using a pressure variation detector capable of responding to a pressure variation inside the cavity of the tire;

on the basis of the information provided by the pressure variation detector, actuating the shift from said so-called “

normal”

pressure measuring mode to said so-called “

accelerated”

measuring mode, or the shift from said “

accelerated”

mode to said “

normal”

mode.

25. A method of measuring pressure and controlling inflation/deflation of tires, according to claim 24, in which the “

accelerated”

mode is that in which the time interval between the measurements carried out by the pressure sensor is substantially shorter than in “

normal”

mode.

26. A method of measuring pressure and controlling inflation/deflation of tires, according to claim 25, in which the “

accelerated”

mode is that in which the time interval between the measurements carried out by the pressure sensor is substantially zero.