Fault detection system having audio analysis and method of using the same

• US 6,775,642 B2
• Filed: 08/07/2002
• Issued: 08/10/2004
• Est. Priority Date: 04/17/2002
• Status: Expired due to Term

• Current Assignee: Continental Automotive Systems, Inc. (Continental AG)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Zancho, William F., Remboski, Donald J.
• Primary Examiner(s): Wachsman, Hal D
• Application Number:
  US10/213,784
• Publication Number:
  US 20030196492A1
• Time in Patent Office: 734 Days
• Field of Search: 702/182-185, 702/39, 702/33-36, 702/56, 702/66, 702/70, 702/71, 702/73-78, 702/113-115, 702/111, 702/122, 702/124, 702/126, 702/145, 702/188, 702/191, 702/193, 702/195, 702/FOR.103, 702/FOR.104, 702/FOR.107, 702/FOR.108, 702/FOR.110, 702/FOR.123, 702/FOR.126, 702/FOR.134, 702/FOR.135, 702/FOR.136, 702/FOR.166, 702/FOR.168, 702/FOR.170, 702/FOR.171, 735/93, 735/70, 735/79, 736/02, 736/46, 736/48, 736/59--61, 731/12, 731/16, 731/173, 701/29, 701/30, 701/34, 701/35, 701/33, 701/99, 324/613, 324/614, 381/58, 381/71.1, 381/71.4, 381/71.12, 381/86, 381/111-125, 381/355, 340/445, 340/679-683, 340/3.43, 340/438, 700/79, 700/80, 700/280
• US Class Current: 702/185
• CPC Class Codes: G01N 2291/015 Attenuation, scattering
• CPC Class Codes: G01N 2291/2696 Wheels, Gears, Bearings
• CPC Class Codes: G01N 29/14 using acoustic emission techniques echo of particles G01N29/046; measuring mechanical vibrations or acoustic waves in solids in general G01H1/00
• CPC Class Codes: G01N 29/46 by spectral analysis, e.g. Fourier analysis or wavelet analysis spectral signal processing per se G06F17/14

Abstract

A fault detection method for determining whether a fault exists with a rotating element of a vehicle that includes a transduce, a diagnosis sampler, and a controller. The transducer converts sounds to an electrical signal that includes a noise component generated from the rotating element. The diagnosis sampler provides a sample of the electrical signal to the controller, which has functional aspects such as an envelope detect, a spectrum analysis, and a fault detect. The envelope detect detects an envelope of the electrical signal. The spectrum analysis forms a spectra from the envelope of the electrical signal, where the spectra is associated with the noise component generated from the rotating element. The fault detect determines (from the formed spectra) whether the fault exists with the rotating element.

Claims

1. A method for detecting a fault associated with a rotating element in a vehicle, the method comprising the steps of:

converting sounds within a cabin of the vehicle to an electrical signal, the electrical signal including a noise component generated from the rotating element;

sampling the electrical signal;

detecting an envelope of the electrical signal, the envelope including the noise components generated from the rotating element;

synchronizing the envelope with data from a sensor associated with the rotating element;

forming a spectra from envelope, the spectra being associated with the noise components generated from the rotating elements; and

determining from the formed spectra whether the fault exists with the rotating element by comparing an amplitude of the formed spectra over a plurality of orders with a predetermined threshold for each order, wherein the predetermined threshold is different for different rotational speeds of the rotating element.

2. The method of claim 1, wherein the converting step includes a microphone within a cabin of the vehicle for converting the sounds.

3. The method of claim 1, wherein the step of synchronizing includes correlating the sensor data with the electrical signal to form a composite envelope for the rotating element, and the step of forming the spectra from the envelope includes forming a spectra of the synchronized composite envelope.

4. The method of claim 3, wherein the synchronizing step includes using the sensor data of the rotating element as a sampling clock to synchronize the composite envelope for that rotating element.

5. The method of claim 1 comprising the further step of sending a fault signal to at least one of an electronic control unit of the vehicle when it is determined that a fault exists with the rotating element or sending fault data to a remote service center to perform fault detection.

6. A method for detecting whether a plurality of fault exist with a plurality of rotating elements in a vehicle, the method comprising the steps of:

converting sounds within a cabin of the vehicle to an electrical signal, the electrical signal including noise components generated from the plurality of rotating elements;

sampling the electrical signal;

detecting an envelope of the electrical signal, the envelope including the noise components generated from the rotating elements;

synchronizing the envelope with data from a sensor associated with each of the plurality of rotating elements by correlating the sensor data with the electrical signal by using the sensor data of one rotating element as a sampling clock to form a synchronized composite envelope for each of the plurality of rotating element;

forming a plurality of spectra of the synchronized composite envelopes, each spectra being associated with one of the noise components generated from the plurality of rotating elements; and

determined from each of the plurality of formed spectra whether one of the faults exist with one of the plurality of rotating elements.

7. The method of claim 6, wherein the converting step includes a microphone within a cabin of the vehicle also used for converting the sounds.

8. The method of claim 6, wherein the step of determining whether one of the faults exist includes a comparison between an amplitude of the formed spectra over a plurality of orders and predetermined threshold for each order, wherein the predetermined threshold is different for different rotational speeds of the plurality of rotating elements.

9. The method of claim 6, comprising the further step of sending a fault signal to at least one of an electrical control unit of the vehicle when it is determined that one of the faults exist with one of the plurality of rotating elements or sending fault data to a remote service center to perform fault detection.