Method and system for detection of a tire's change of state

• US 20030070478A1
• Filed: 09/10/2002
• Published: 04/17/2003
• Est. Priority Date: 09/10/2001
• Status: Active Grant

• Current Assignee: Continental Automotive GmbH (Continental AG)
• Original Assignee: Siemens AG
• Inventors: Fischer, Martin, Hillenmayer, Franz, Fuessel, Dominik
• Granted Patent: US 6,705,157 B2
• 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

Abstract

The present invention comprises and system and method for detecting a change in the state of pneumatic tires. The change of state refers to the state of internal air pressure, temperature or other such parameter. Herein, a difference of at least two successive readings are taken or a further analysis is performed and either is compared with a threshold value below which a change of state has occurred.

Claims

1. A method for detecting at least one tire'"'"'s change of state, comprising the steps of:

repeatedly measuring characteristics of said tire;

determining a first value comprising addition of a first and second measured characteristics, said first measured characteristic being taken at a preselect time, said second measured characteristic being taken at a time before said preselect time and further being multiplied by a preselected parameter;

determining a second value comprising said first value less said second measured characteristic; and

generating a comparison of between said successive second values and a predetermined threshold value, said comparison being indicative of said tire'"'"'s change of state when said second value falls below said threshold.

2. The method according to claim 1, wherein said parameter is a constant.

3. The method according to claim 1, wherein said parameter is between zero and one.

4. The method according to claim 1 further comprising the steps of generating a comparison of said second value for each of said at least one tire'"'"'s wherein said comparison is indicative of a second change of state of said at least one tire.

5. The method according to claims 1, wherein said characteristic comprises air pressure within said tire.

6. The method according to claims 1, wherein said characteristic comprises temperature within said tire.

7. A method for detecting at least one tire'"'"'s change of state, comprising the steps of:

repeatedly measuring characteristics of said tire;

determining a first value comprising addition of a first and second measured characteristics, said first measured characteristic being taken at a preselect time, said second measured characteristic being taken at a time before said preselect time and further being multiplied by a preselected parameter;

determining a second value comprising said first value less said second measured characteristic; and

generating a comparison of a difference of said first and second values with a predetermined threshold value, said comparison being indicative of said tire'"'"'s change of state.

8. The method according to claim 7, wherein said parameter is a constant.

9. The method according to claim 7, wherein said parameter is between zero and one.

10. The method according to claim 7, further comprising the steps of generating a comparison of said second value for each of said at least one tire'"'"'s wherein said comparison is indicative of a second change of state of said at least one tire.

11. The method according to claims 7, wherein said characteristic comprises air pressure within said tire.

12. The method according to claims 7, wherein said characteristic comprises temperature within said tire.

13. A system for monitoring change of state of at least one tire, comprising means for:

repeatedly measuring characteristics of said tire;

determining a first value comprising addition of a first and second measured characteristics, said first measured characteristic being taken at a preselect time, said second measured characteristic being taken at a time before said preselect time and further being multiplied by a preselected parameter;

determining a second value comprising said first value less said second measured characteristic; and

generating a comparison of between said second value and a predetermined threshold value, said comparison being indicative of said tire'"'"'s change of state when said second value falls below said threshold.

14. The system according to claim 13, wherein said parameter is a constant.

15. The system according to claim 13, wherein said parameter is between zero and one.

16. The system according to claim 13, further comprising the steps of generating a comparison of said second value for each of said at least one tire'"'"'s wherein said comparison is indicative of a second change of state of said at least one tire.

17. The system according to claims 13, wherein said characteristic comprises air pressure within said tire.

18. The system according to claims 13, wherein said characteristic comprises temperature within said tire.

19. A system for monitoring change of state of at least one tire, comprising means for:

repeatedly measuring characteristics of said tire;

determining a first value comprising addition of a first and second measured characteristics, said first measured characteristic being taken at a preselect time, said second measured characteristic being taken at a time before said preselect time and further being multiplied by a preselected parameter;

determining a second value comprising said first value less said second measured characteristic; and

generating a comparison of a difference of said first and second values with a predetermined threshold value, said comparison being indicative of said tire'"'"'s change of state.

20. The system according to claim 20, wherein said parameter is a constant.

21. The system according to claim 20, wherein said parameter is between zero and one.

22. The system according to claim 20, further comprising the steps of generating a comparison of said second value for each of said at least one tire'"'"'s wherein said comparison is indicative of a second change of state of said at least one tire.

23. The system according to claims 20, wherein said characteristic comprises air pressure within said tire.

24. The system according to claims 20, wherein said characteristic comprises temperature within said tire.