Method of confirming a pressure alert in a pressure-monitoring system

• US 20070251310A1
• Filed: 04/20/2007
• Published: 11/01/2007
• Est. Priority Date: 04/21/2006
• Status: Abandoned Application

• 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: Pompier, Jean-Pierre
• Application Number:
  US11/785,855
• Publication Number:
  US 20070251310A1
• Time in Patent Office: Days
• US Class Current: 73/146
• 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: B60C 23/0476 Temperature compensation of measured pressure values

Abstract

A vehicle'"'"'s tire pressure is monitored such that an actual pressure (P_m) measured within the tire is compared to a set pressure (P_cTm) which has been corrected for the measured value of the temperature (T_m) in order to trigger a pressure alert in the event of a pressure leak. If the tire is cooling, the pressure alerts are stopped if the variation temperature per unit of time (a negative value in a cooling tire) is less than a threshold temperature drift value (also a negative value). Thus, the pressure alerts are stopped when the tire cools at a rapid rate, indicating that the tire is not moving.

Claims

1. A method of monitoring a tire for pressure leaks, in which a pressure (P_m) measured within the chamber of the tire is compared with a set pressure (P_cTm) corrected for the measured value of the tire temperature (T_m) for detecting a pressure leak and triggering the sending of a pressure alert, wherein the sending of a pressure alert is neutralized when the variation in temperature per unit of time

2. A method according to claim 1, wherein the neutralization of the pressure alert is lifted when the difference between the measured pressure (P_m) and the set pressure (P_cTm) is greater than a predetermined threshold value.

3. A method according to claim 2 wherein the threshold temperature drift value is between −

1°

C./hr and −

10°

C./hr.

4. A method according to claim 2 wherein the threshold temperature drift value is approximately −

2°

C./hr.

5. A method according to claim 1 wherein the threshold temperature drift value is between −

1°

C./hr and −

10°

C./hr.

6. A method according to claim 1 wherein the threshold temperature drift value is approximately −

2°

C./hr.

7. An apparatus for monitoring a tire for pressure leaks according to claim 1, including an algorithm for detecting when

8. A tire pressure monitoring apparatus according to claim 7 wherein the algorithm detects when the difference between the measured pressure (P_m) and the set pressure (P_cTm) is greater than a predetermined threshold value, in order to lift the neutralization of the pressure alert.