Method For Improving an Indirectly Measuring Tire Pressure Monitoring System

• US 20080208502A1
• Filed: 08/31/2006
• Published: 08/28/2008
• Est. Priority Date: 09/09/2005
• Status: Active Grant

• Current Assignee: Continental Teves AG & Co. OHG (Continental AG)
• Original Assignee: Continental Teves AG & Co. OHG (Continental AG)
• Inventors: Koukes, Vladimir, Wagner, Michel, Griesser, Martin, Bauer, Geoffrey B.
• Granted Patent: US 7,912,663 B2
• Time in Patent Office: Days
• US Class Current: 702/98
• CPC Class Codes: B60C 23/061 by monitoring wheel speed measuring distance traversed on the ground by vehicles G01C22/00
• CPC Class Codes: B60C 23/062 Frequency spectrum analysis of wheel speed signals, e.g. using Fourier transformation

Abstract

Disclosed is a method of improving the recognition of a tire pressure loss in a tire pressure monitoring system in which at least one reference value (A) is formed on the basis of signals representing the rotational speeds of several vehicle wheels. A pressure loss is concluded by comparing a currently determined reference value with at least one reference value if the currently determined reference value exceeds or falls short of a predefined value. A noise analysis of the reference value(s) (101) is executed and at least one threshold value (T, S) is adjusted (108) based on the result of the noise analysis (102).

Claims

1-10. -10. (canceled)

11. A method for improving recognition of a tire deflation in a tire pressure monitoring system, the method comprising:

generating at least one reference value (A) based on signals representing wheel speeds of several vehicle wheels;

comparing one currently determined reference value with at least one comparative value;

inferring a pressure loss if the currently determined reference value falls within a predetermined range based on a threshold value;

performing a noise analysis on the reference values (101); and

adjusting the threshold value (108) subject to a result of the noise analysis (102).

12. A method according to claim 11, wherein the threshold value adjusted is a threshold value (T) for noise recognition or a threshold value (S) for detecting a pressure loss.

13. A method according to claim 11, wherein the values (A_k) of a reference value are averaged (103), wherein the values (A_k) considered for forming the mean value are selected subject to the result of the noise analysis (102) or an adjustment of the number (N) of the values (A_k) considered for generating a mean value;

is carried out subject to the result of the noise analysis (102) or the adjustment (108) of the threshold value (T) for noise detection;

or subject to a value for the dispersion (104) of the values (A_k), in particular the standard deviation.

14. A method according to claim 11, wherein at least one threshold value (S) is used for determining the pressure loss, which is adjusted subject to a value for the dispersion (104) of the values (A_k) of a reference value, in particular a standard deviation.

15. A method according to claim 11, wherein a dependence of a reference value (A) upon a driving parameter (X) is achieved by determining the parameters (Slope, Offset) of a functional correlation, in particular a linear correlation.

16. A method according to claim 15, wherein single values (A_k) or mean values (Â

) of the reference value (A) are used for determining parameters (Slope, Offset) of a functional correlation.

17. A method according to claim 16, wherein the parameters (Slope, Offset) of the functional correlation are determined as soon as a new value pair is determined on the basis of the driving parameter (X_n) and reference value (A_n(X_n)).

18. A method according to claim 17, wherein the parameters (Slope, Offset) of the functional correlation, such as the parameters (Slope₀, Offset₀) determined during the teach-in mode of the system, are used for determining a pressure loss.

19. A method according to claim 11, wherein at least one of the noise analysis and the determination of the parameters of the functional correlation is carried out during the teach-in phase of the system in which the coomparative values are determined, or during the pressure monitoring phase.

20. The method of claim 11, where a computer program product defines an algorithm for performing the method.