Method for improving an indirectly measuring tire pressure monitoring system

• US 7,912,663 B2
• Filed: 08/31/2006
• Issued: 03/22/2011
• Est. Priority Date: 09/09/2005
• Status: Expired due to Fees

• 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
• Primary Examiner(s): KHUU, HIEN DIEU THI
• Application Number:
  US12/065,918
• Publication Number:
  US 20080208502A1
• Time in Patent Office: 1,664 Days
• Field of Search: 702/98, 702/69, 702/85, 702/140, 73/37, 731/462, 731/463, 340/442, 340/443
• 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. A non-transitory computer readable medium containing computer instructions stored therein for causing a computer processor to perform the method of operating a tire pressure monitoring system, comprising:

generating a sequence of reference values(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

increasing the threshold value in response to the noise analysis showing that noise of the reference values exceeds the threshold value for a predetermined amount of time (t₂-t₁).

2. The non-transitory computer readable medium of claim 1, wherein the threshold value adjusted is a threshold value (T) for noise recognition or a threshold value (S) for detecting a pressure loss.

3. The non-transitory computer readable medium of claim 1, 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 standard deviation of the dispersion (104) of the values (A_k).

4. The non-transitory computer readable medium of claim 1, wherein at least one threshold value (S) is used for determining the pressure loss, which is adjusted subject to a standard deviation for the dispersion (104) of the values (A_k) of a reference value.

5. The non-transitory computer readable medium of claim 1, wherein a dependence of a reference value (A) upon a driving parameter (X) is achieved by determining the parameters (Slope, Offset) of a linear correlation.

6. The non-transitory computer readable medium of claim 5, 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.

7. The non-transitory computer readable medium of claim 6, wherein the parameters (Slope, Offset) of the functional correlation are determined after a new value pair is determined on the basis of the driving parameter (X_n) and reference value (A_n(X_n)).

8. The non-transitory computer readable medium of claim 7, wherein the parameters (Slope, Offset) of the functional correlation are used for determining a pressure loss.

9. The non-transitory computer readable medium of claim 1, 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 comparative values are determined, or during the pressure monitoring phase.