Method, system and computer program for estimation of the pressure

• US 8,554,498 B2
• Filed: 03/16/2007
• Issued: 10/08/2013
• Est. Priority Date: 03/16/2007
• Status: Active Grant

• Current Assignee: Nira Dynamics AB
• Original Assignee: Nira Dynamics AB
• Inventors: Gustafsson, Tony, Lindskog, Peter, Hall, Peter, Forssell, Urban, Gustavsson, Fredrik, Stenman, Anders
• Primary Examiner(s): CHERRY, STEPHEN J
• Application Number:
  US12/531,684
• Publication Number:
  US 20100191483A1
• Time in Patent Office: 2,398 Days
• Field of Search: 702/50
• US Class Current: 702/50
• 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

The invention is directed to a system, a method and a computer program including program code for carrying out the method, when executed on a processing system, of estimating a tire pressure deviation of a vehicle'"'"'s tire (2). The system includes an input section (100) adapted to receive as an input signal a vehicle signal, a calculation section (200) adapted to calculate at least one shape factor of a resonance peak associated with the vehicle signal spectrum (2) on the basis of the input signal, and a determination section (300) adapted to derive, depending on said at least one shape factor, a tire pressure signal indicative of a tire pressure deviation within the vehicle'"'"'s tire (2).

Claims

1. A method of estimating a tire pressure of a vehicle'"'"'s tire, comprising:

receiving as an input signal a pressure-related signal relating to the tire pressure;

calculating at least one shape factor (H;

W;

S;

HNL;

I;

ANL), of a resonance peak associated with a spectrum of the pressure-related signal on the basis of the input signal; and

determining, with a processor, depending on said at least one shape factor (H;

W;

S;

HNL;

I;

ANL), a tire pressure signal indicative of a tire pressure within the vehicle'"'"'s tire, wherein the shape factor (H;

W;

S;

HNL;

I;

ANL) comprises at least one of;

the integral (I) of the resonance peak, and

the area (ANL) under the peak down to the noise floor level.

2. The method according to claim 1, wherein the pressure-related signal is a wheel speed sensor signal indicative of the wheel speed of the vehicle'"'"'s tire.

3. The method according to claim 1, wherein the tire pressure signal is also determined on the basis of a signal indicative of a wheel radius.

4. The method according to claim 1, wherein the tire pressure signal is also determined on the basis of at least one further pressure-related signal being associated with a further vehicle'"'"'s tire.

5. A system of estimating a tire pressure of a vehicle'"'"'s tire, comprising:

an input section adapted to receive as an input signal a pressure related signal;

a calculation section adapted to calculate at least one shape factor (H;

W;

S;

HNL;

I;

ANL) of a resonance peak associated with a spectrum of the pressure-related signal on the basis of the input signal; and

a determination section adapted to derive, depending on said at least one shape factor (H;

W;

S;

HNL;

I;

ANL), a tire pressure signal indicative of a tire pressure within the vehicle'"'"'s tire, wherein the shape factor (H;

W;

S;

HNL;

I;

ANL) comprises at least one of;

the integral (I) of the resonance peak, and

the area (ANL) under the peak down to the noise floor level.

6. The system according to claim 5, wherein the pressure-related signal is a wheel speed sensor signal indicative of the wheel speed of the vehicle'"'"'s tire.

7. The system according to claim 5, wherein the determination section is further adapted to determine the tire pressure signal on the basis of a signal indicative of a wheel radius.

8. The system according to claim 5, wherein the determination section is further adapted to determine the tire pressure signal on the basis of at least one further pressure-related signal being associated with a further vehicle'"'"'s tire.

9. A non-transitory computer readable medium including program code for carrying out a method, when executed on a processing system, of estimating a tire pressure of a vehicle'"'"'s tire, the method comprising:

receiving as an input signal a pressure-related signal;

calculating at least one shape factor (H;

W;

S;

HNL;

I;

ANL) of a resonance peak associated with a spectrum of the pressure-related signal on the basis of the input signal; and

determining, depending on said at least one shape factor (H;

W;

S;

HNL;

I;

ANL), a tire pressure signal indicative of the tire pressure within the vehicle'"'"'s tire, wherein the shape factor (H;

W;

S;

HNL;

I;

ANL) comprises at least one of;

the integral (I) of the resonance peak, and

the area (ANL) under the peak down to the noise floor level.