Method and device for determining endstage of lifetime of...

Details Method and device for determining endstage of lifetime of... Method and device for determining endstage of lifetime of...

2005-04-05

2009-06-09

Allen, Andre J (Department: 2855)

Measuring and testing

Tire, tread or roadway

C340S442000

Reexamination Certificate

active

07543489

ABSTRACT:
The present invention provides a method and device for determining an end stage of lifetime of a run-flat tire under a run-flat state. The method includes the step S1of monitoring the tire internal pressure on a vehicle equipped with a run-flat tire system comprising run-flat tires and tire information transmitter to determine that the tire starts running under a run-flat state when the tire internal pressure becomes lower than a given internal pressure, the step S2of measuring the temperature of the tire during running at the run-flat state, the step S3of calculating a rate of change in temperature per unit time based on the measured temperature value of the tire, and the step S4of comparing the rate of change with a given negative threshold to determine that the run-flat tire is in an end stage of lifetime under a run-flat state when the rate of change in temperature is smaller than the given threshold.

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patent: WO 01/17806 (2001-03-01), None
patent: WO 2004/014671 (2004-02-01), None
patent: WO 2004/091943 (2004-10-01), None

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