Global Patent Index - EP 1240035 A1

EP 1240035 A1 2002-09-18 - CALIBRATION OF A TRANSPONDER FOR A TIRE PRESSURE MONITORING SYSTEM

Title (en)

CALIBRATION OF A TRANSPONDER FOR A TIRE PRESSURE MONITORING SYSTEM

Title (de)

TRANSPONDER- KALIBRIERUNG FÜR EINE REIFENÜBERWACHUNGSVORRICHTUNG

Title (fr)

ETALONNAGE D'UN TRANSPONDEUR POUR SYSTEME DE SURVEILLANCE DE LA PRESSION DE GONFLAGE

Publication

EP 1240035 A1 (EN)

Application

EP 99967303 A

Priority

US 9929606 W

Abstract (en)

[origin: WO0143997A1] A method (650) of calibrating a transponder (200, 604) capable of measuring temperature data (NT) and pressure data (NP) in an object (e.g., a tire, (104)) and transmitting a data stream (Figure 3C) to an external reader/interrogator (106, 400). The transponder includes memory (238) for storing measurements, calibration data (662), transponder ID number and the like. Since the transponder combines temperature and pressure information in the "pressure" data, the ratio NT/NP is a direct indicator of pressure-only, and is also relatively insensitive to transponder power variations. The calibration method employs a calibration chamber (602) containing reference pressure (614) and temperature (612) sensors. The transducer to be calibrated is placed in the chamber and exposed (652) to a number of predetermined temperatures and pressures (as measured by the reference sensors) at a number of calibration points. At each calibration point, a temperature reading (NT) and a pressure reading (NP) sensed by the transponder are recorded along with the reference temperature and pressure. From these readings and reference measurements the calibration constants (NT25, mT, NT/NP700,25, mP) are calculated (658).

IPC 1-7 (main, further and additional classification)

B60C 23/04

IPC 8 full level (invention and additional information)

G01L 17/00 (2006.01); B60C 23/02 (2006.01); B60C 23/04 (2006.01); G01L 27/00 (2006.01)

CPC (invention and additional information)

B60C 23/0474 (2013.01); B60C 23/0413 (2013.01); B60C 23/0462 (2013.01); B60C 23/0471 (2013.01)

Citation (search report)

See references of WO 0143997A1

Designated contracting state (EPC)

DE FR GB IT

EPO simple patent family

WO 0143997 A1 20010621; AU 2360800 A 20010625; BR 9917580 A 20020806; EP 1240035 A1 20020918; JP 2003517150 A 20030520

INPADOC legal status


2004-05-19 [RBV] DESIGNATED CONTRACTING STATES (CORRECTION)

- Designated State(s): DE FR GB IT

2003-11-26 [18D] APPLICATION DEEMED TO BE WITHDRAWN

- Effective date: 20030520

2002-12-18 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20021107

2002-09-18 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20020715

2002-09-18 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2002-09-18 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Free text: AL;LT;LV;MK;RO;SI