Device and method for detecting a pressure change in a tire using a plurality of temperature signals

Patent metadata

Field	Value
Publication number	US-9796220-B2
Application number	US-201414503956-A
Country	US
Kind code	B2
Filing date	Oct 1, 2014
Priority date	Oct 1, 2013
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

A device for detecting a pressure change in a tire includes a first temperature sensor located outside the tire, the first temperature sensor being configured to produce a first temperature signal indicative of a first temperature, an input apparatus configured to receive the first temperature signal from the first temperatures sensor, and to receive a second temperature signal from a second temperature sensor, the second temperature signal being indicative of a second temperature, and to receive a tire pressure signal from a tire pressure sensor, the tire pressure signal being indicative of a tire pressure of the tire, and a processor configured to output an evaluation signal including information about a change of tire pressure based on the pressure signal and based on the first temperature signal and the second temperature signal.

First claim

We claim:

1. A device for detecting a pressure change in a tire, the device comprising:
an input apparatus configured to receive a first temperature signal including information about a first temperature, a second temperature signal including information about a second temperature, and a pressure signal including information about a pressure of the tire, wherein the first temperature signal, the second temperature signal, or the pressure signal comprise a plurality of measurements taken over a period of time;
wherein the first temperature signal is generated by a first temperature sensor which is disposed outside the tire;
a processor configured to evaluate the information about the pressure of the tire based on the information about the first temperature and the information about the second temperature, and to generate an evaluation signal based on the evaluation of the information about the pressure of the tire, the evaluation signal including information about a pressure change in the tire with respect to time; and
an output apparatus configured to provide the evaluation signal.

2. The device according to claim 1 , wherein the processor is configured to evaluate the pressure signal only if a temperature difference between the first temperature and the second temperature is smaller than a predefined limit value.

3. The device according to claim 1 , wherein the input apparatus is configured to a receive a state signal indicative of an operating state of the tire, wherein the processor is configure to evaluate the pressure signal if the state signal indicates a stoppage of the tire, and wherein the input apparatus is configured to receive the pressure signal after receiving of the state signal.

4. The device according to claim 1 , further comprising an acceleration sensor configured and disposed to generate a state signal indicative of an operating state of the tire.

5. The device according to claim 4 , wherein the processor is configured to evaluate the pressure signal after a predetermined time interval following receipt of the state signal, and the input apparatus is configured to receive the pressure signal after the predetermined time interval.

6. The device according to claim 1 , including a pressure sensor configured to generate the pressure signal, the pressure sensor being disposed in the tire.

7. The device according to claim 1 , wherein the first temperature signal and the second temperature signal are generated by a first temperature sensor and a second temperature sensor different than the first temperature sensor.

8. The device according to claim 1 , including a second temperature sensor configured to generate the second temperature signal, the second temperature sensor being configured to measure a temperature outside the tire.

9. The device according to claim 1 , wherein at least one of the first temperature signal, the second temperature signal, and the pressure signal includes a plurality of temporally successive units of information about a first temperature, a second temperature, or a pressure, wherein a predetermined time interval falls between two successive units of information.

10. The device according to claim 1 , wherein the processor is configured to generate the evaluation signal such that the evaluation signal includes information about a normalized pressure which is normalized to a reference temperature value with respect to a temperature which comprises at least one of the temperature signals in the same time interval.

11. The device according to claim 1 , wherein,
the processor is configured to evaluate the pressure signal only if a temperature difference between the first temperature and the second temperature is smaller than a predefined limit value, and
wherein the input apparatus is configured to a receive a state signal indicative of an operating state of the tire, and wherein the processor is configure to evaluate the pressure signal if the state signal indicates a stoppage of the tire, and wherein the input apparatus is configured to receive the pressure signal after receiving of the state signal, and
further comprising an acceleration sensor configured and disposed to generate a state signal indicative of an operating state of the tire, wherein the processor is configured to evaluate the pressure signal after a predetermined time interval following receipt of the state signal, and the input apparatus is configured to receive the pressure signal after the predetermined time interval, and
including a pressure sensor configured to generate the pressure signal, the pressure sensor being disposed in the tire,

and wherein the first temperature signal and the second temperature signal are generated by a first temperature sensor and a second temperature sensor different than the first temperature sensor,
and wherein at least one of the first temperature signal, the second temperature signal, and the pressure signal includes a plurality of temporally successive units of information about a first temperature, a second temperature, or a pressure, wherein a predetermined time interval falls between two successive units of information, and
wherein the processor is configured to generate the evaluation signal such that the evaluation signal includes information about a normalized pressure which is normalized to a reference temperature value with respect to a temperature which comprises at least one of the temperature signals in the same time interval.

12. A device for detecting a pressure change in a tire, the device comprising:
a first temperature sensor located outside the tire, the first temperature sensor being configured to produce a first temperature signal indicative of a first temperature;
an input apparatus configured to receive the first temperature signal from the first temperatures sensor, and to receive a second temperature signal from a second temperature sensor, the second temperature signal being indicative of a second temperature, and to receive a tire pressure signal from a tire pressure sensor, the tire pressure signal being indicative of a tire pressure of the tire, wherein the first temperature signal, the second temperature signal, or the pressure signal comprise a plurality of measurements taken over a period of time; and
a processor configured to output an evaluation signal including information about a change of tire pressure with respect to time based on the pressure signal and the first temperature signal and the second temperature signal.

13. The device according to claim 12 , wherein the processor is configured to output the evaluation signal only after a difference between the first temperature and the second temperature is less than a predetermined difference.

14. The device according to claim 12 , including an acceleration sensor configured to produce a state signal indicative of whether the tire is stopped, wherein the input apparatus is configured to receive the state signal, and wherein the processor is configured to output the evaluation signal only after the state signal indicates that the tire has been stopped for a predetermined period of time.

15. The device according to claim 12 , wherein the evaluation signal is based on a plurality of tire pressure signals from the tire pressure sensor, the plurality of tire pressure signals being taken during an evaluation time period, the evaluation time period beginning after a difference between the first temperature and the second temperature becomes less than a predetermined value.

16. The device according to claim 12 , including an acceleration sensor configured to produce a state

Assignees

• Graf Jens
• Kourtev Milen
• Skf Ab

Inventors

• Graf Jens
• Kourtev Milen

Classifications

• B60C23/0476 Primary

  Temperature compensation of measured pressure values · CPC title