FAILURE DETECT DEVICE AND FAILURE DETECT METHOD

• US 20100064814A1
• Filed: 08/27/2009
• Published: 03/18/2010
• Est. Priority Date: 09/17/2008
• Status: Active Grant

• Current Assignee: Jatco Limited (Nissan Motor Co., Ltd.), Nissan Motor Co., Ltd.
• Original Assignee: Jatco Limited (Nissan Motor Co., Ltd.)
• Inventors: Kudou, Hisashi, Soya, Hiromu, Ashizawa, Masayuki, KISHINO, Mitsuhiro
• Granted Patent: US 8,146,433 B2
• Time in Patent Office: Days
• US Class Current: 73/660
• CPC Class Codes: G01M 13/028 Acoustic or vibration analysis
• CPC Class Codes: G01M 13/045 Acoustic or vibration analysis

Abstract

A failure detect device detects the presence of a failure in a peripheral member of a rotary shaft by analyzing a vibration generated in a device provided with the rotary shaft when the rotary shaft is rotated. A vibration detection unit detects the vibration of the device, and a rotation speed detection unit detects a rotation speed of the rotary shaft. An analysis unit calculates a frequency spectrum of the vibration of the device and determines an actually measured vibration level at each vibration order by dividing a frequency component of the calculated frequency spectrum by the rotation speed of the rotary shaft. A detection unit detects the presence of a failure in the peripheral member on the basis of the actually measured vibration level at each vibration order.

Claims

1. A failure detect device that detects the presence of a failure in a predetermined peripheral member disposed to either one of a rotary shaft and a power transmission path that passes through the rotary shaft by analyzing a vibration generated in a device provided with the rotary shaft when the rotary shaft is rotated, comprising:

a vibration detecting unit that detects the vibration of the device;

a rotation speed detecting unit that detects a rotation speed of the rotary shaft;

an analyzing unit that calculates a frequency spectrum of the vibration detected by the vibration detecting unit and determining an actually measured vibration level at each vibration order by dividing a frequency component of the calculated frequency spectrum by the rotation speed detected by the rotation speed detecting unit; and

a detecting unit that detects the presence of a failure in the predetermined peripheral member on the basis of the actually measured vibration level at each vibration order determined by the analyzing unit.

2. The failure detect device as defined in claim 1, wherein the analyzing unit calculates the frequency spectrum of the vibration detected by the vibration detecting unit after envelope processing has been implemented on the vibration.

3. The failure detect device as defined in claim 1, further comprising a reference value holding unit that holds a reference order value and a reference vibration level set in relation to the predetermined peripheral member,

wherein the detecting unit compares an actually measured vibration level corresponding to the reference order value, from the actually measured vibration level at each vibration order, with the reference vibration level, and determines the presence of a failure in the predetermined peripheral member when the actually measured vibration level is greater than the reference vibration level.

4. The failure detect device as defined in claim 1, further comprising a reference value holding unit that holds a reference order value and a reference vibration level set in relation to the predetermined peripheral member,

wherein the detecting unit performs processing for comparing an actually measured vibration level corresponding to the reference order value, from the actually measured vibration level at each vibration order, with the reference vibration level repeatedly, and determines the presence of a failure in the predetermined peripheral member when a number of times the actually measured vibration level is determined to be greater than the reference vibration level exceeds a predetermined number.

5. The failure detect device as defined in claim 1, wherein the rotary shaft is either one of an input shaft and an output shaft attached to either one of a continuously variable mechanism and a stepped shift mechanism.

6. A failure detect device that detects the presence of a failure in either one of a predetermined input shaft peripheral member, disposed to either one of an input shaft attached to either one of a continuously variable mechanism and a stepped shift mechanism and a power transmission path that passes through the input shaft, and a predetermined output shaft peripheral member, disposed to either one of an output shaft attached to either one of the continuously variable mechanism and the stepped shift mechanism and a power transmission path that passes through the output shaft, by analyzing a vibration generated in a device provided with the input shaft and the output shaft when the input shaft and the output shaft are rotated, comprising:

a vibration detecting unit that detects the vibration of the device;

a first rotation speed detecting unit that detects a rotation speed of the input shaft;

a second rotation speed detecting unit that detects a rotation speed of the output shaft;

an analyzing unit that calculates a frequency spectrum of the vibration detected by the vibration detecting unit, determining an actually measured vibration level at each vibration order of the input shaft by dividing a frequency component of the calculated frequency spectrum by the rotation speed detected by the first rotation speed detecting unit, and determining an actually measured vibration level at each vibration order of the output shaft by dividing a frequency component of the calculated frequency spectrum by the rotation speed detected by the second rotation speed detecting unit; and

a detecting unit that detects the presence of a failure in the predetermined input shaft peripheral member on the basis of the actually measured vibration level at each vibration order of the input shaft, determined by the analyzing unit, and detecting the presence of a failure in the predetermined output shaft peripheral member on the basis of the actually measured vibration level at each vibration order of the output shaft, determined by the analyzing unit.

7. A failure detect method for detecting the presence of a failure in a predetermined peripheral member disposed to either one of a rotary shaft and a power transmission path that passes through the rotary shaft by analyzing a vibration generated in a device provided with the rotary shaft when the rotary shaft is rotated, comprising:

a vibration detecting step for detecting the vibration of the device;

a rotation speed detecting step for detecting a rotation speed of the rotary shaft;

an analyzing step for calculating a frequency spectrum of the vibration detected by the vibration detecting step and determining an actually measured vibration level at each vibration order by dividing a frequency component of the calculated frequency spectrum by the rotation speed detected by the rotation speed detecting step; and

a detecting step for detecting the presence of a failure in the predetermined peripheral member on the basis of the actually measured vibration level at each vibration order determined by the analyzing step.

8. The failure detect method as defined in claim 7, wherein the analyzing step calculates the frequency spectrum of the vibration detected by the vibration detecting step after envelope processing has been implemented on the vibration.

9. The failure detect method as defined in claim 7, wherein the detecting step compares an actually measured vibration level corresponding to a reference order value set in relation to the predetermined peripheral member, from the actually measured vibration level at each vibration order, with a reference vibration level set in relation to the predetermined peripheral member, and determines the presence of a failure in the predetermined peripheral member when the actually measured vibration level is greater than the reference vibration level.

10. The failure detect method as defined in claim 7, wherein the detecting step performs processing for comparing an actually measured vibration level corresponding to a reference order value set in relation to the predetermined peripheral member, from the actually measured vibration level at each vibration order, with a reference vibration level set in relation to the predetermined peripheral member repeatedly, and determines the presence of a failure in the predetermined peripheral member when a number of times the actually measured vibration level is determined to be greater than the reference vibration level exceeds a predetermined number.

11. The failure detect method as defined in claim 7, wherein the rotary shaft is either one of an input shaft and an output shaft attached to either one of a continuously variable mechanism and a stepped shift mechanism.

12. A failure detect method for detecting the presence of a failure in either one of a predetermined input shaft peripheral member, disposed to either one of an input shaft attached to either one of a continuously variable mechanism and a stepped shift mechanism and a power transmission path that passes through the input shaft, and a predetermined output shaft peripheral member, disposed to either one of an output shaft attached to either one of the continuously variable mechanism and the stepped shift mechanism and a power transmission path that passes through the output shaft, by analyzing a vibration generated in a device provided with the input shaft and the output shaft when the input shaft and the output shaft are rotated, comprising:

a vibration detecting step for detecting the vibration of the device;

a first rotation speed detecting step for detecting a rotation speed of the input shaft;

a second rotation speed detecting step for detecting a rotation speed of the output shaft;

an analyzing step for calculating a frequency spectrum of the vibration detected by the vibration detecting step, determining an actually measured vibration level at each vibration order of the input shaft by dividing a frequency component of the calculated frequency spectrum by the rotation speed detected by the first rotation speed detecting step, and determining an actually measured vibration level at each vibration order of the output shaft by dividing a frequency component of the calculated frequency spectrum by the rotation speed detected by the second rotation speed detecting step; and

a detecting step for detecting the presence of a failure in the predetermined input shaft peripheral member on the basis of the actually measured vibration level at each vibration order of the input shaft, determined by the analyzing step and detecting the presence of a failure in the predetermined output shaft peripheral member on the basis of the actually measured vibration level at each vibration order of the output shaft, determined by the analyzing step.

13. A failure detect device that detects the presence of a failure in a predetermined peripheral member disposed to either one of a rotary shaft and a power transmission path that passes through the rotary shaft by analyzing a vibration generated in a device provided with the rotary shaft when the rotary shaft is rotated, comprising:

vibration detecting means for detecting the vibration of the device;

rotation speed detecting means for detecting a rotation speed of the rotary shaft;

analyzing means for calculating a frequency spectrum of the vibration detected by the vibration detecting means and determining an actually measured vibration level at each vibration order by dividing a frequency component of the calculated frequency spectrum by the rotation speed detected by the rotation speed detecting means; and

detecting means for detecting the presence of a failure in the predetermined peripheral member on the basis of the actually measured vibration level at each vibration order determined by the analyzing means.

14. The failure detect device as defined in claim 13, wherein the analyzing means calculates the frequency spectrum of the vibration detected by the vibration detecting means after envelope processing has been implemented on the vibration.

15. The failure detect device as defined in claim 13, further comprising reference value holding means for holding a reference order value and a reference vibration level set in relation to the predetermined peripheral member,

wherein the detecting means compares an actually measured vibration level corresponding to the reference order value, from the actually measured vibration level at each vibration order, with the reference vibration level, and determines the presence of a failure in the predetermined peripheral member when the actually measured vibration level is greater than the reference vibration level.

16. The failure detect device as defined in claim 13, further comprising reference value holding means for holding a reference order value and a reference vibration level set in relation to the predetermined peripheral member,

wherein the detecting means performs processing for comparing an actually measured vibration level corresponding to the reference order value, from the actually measured vibration level at each vibration order, with the reference vibration level repeatedly, and determines the presence of a failure in the predetermined peripheral member when a number of times the actually measured vibration level is determined to be greater than the reference vibration level exceeds a predetermined number.

17. The failure detect device as defined in claim 13, wherein the rotary shaft is either one of an input shaft and an output shaft attached to either one of a continuously variable mechanism and a stepped shift mechanism.

18. A failure detect device that detects the presence of a failure in either one of a predetermined input shaft peripheral member, disposed to either one of an input shaft attached to either one of a continuously variable mechanism and a stepped shift mechanism and a power transmission path that passes through the input shaft, and a predetermined output shaft peripheral member, disposed to either one of an output shaft attached to either one of the continuously variable mechanism and the stepped shift mechanism and a power transmission path that passes through the output shaft, by analyzing a vibration generated in a device provided with the input shaft and the output shaft when the input shaft and the output shaft are rotated, comprising:

vibration detecting means for detecting the vibration of the device;

first rotation speed detecting means for detecting a rotation speed of the input shaft;

second rotation speed detecting means for detecting a rotation speed of the output shaft;

analyzing means for calculating a frequency spectrum of the vibration detected by the vibration detecting means, determining an actually measured vibration level at each vibration order of the input shaft by dividing a frequency component of the calculated frequency spectrum by the rotation speed detected by the first rotation speed detecting means, and determining an actually measured vibration level at each vibration order of the output shaft by dividing a frequency component of the calculated frequency spectrum by the rotation speed detected by the second rotation speed detecting means; and

detecting means for detecting the presence of a failure in the predetermined input shaft peripheral member on the basis of the actually measured vibration level at each vibration order of the input shaft, determined by the analyzing means, and detecting the presence of a failure in the predetermined output shaft peripheral member on the basis of the actually measured vibration level at each vibration order of the output shaft, determined by the analyzing means.