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US5955674A
Expired / Lapsed
US
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Driveline vibration system diagnostics
Assignee: Eaton Corp
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Filing: 1997-10-31
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Granted: 1999-09-21
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Expires: 2017-10-31
Abstract
Abstract A diagnostic driveline vibration analyzing tool for measuring and characterizing the torsional vibration of a rotating component such as a transmission output shaft in a vehicle driveline. An electronic control unit and sensor cooperate to measure speed fluctuations occurring between the passing of adjacent teeth of a rotating gear. These time measurements are then filtered using an order tracked pass band filter to isolate frequencies of interest the results of which are then used to calculate a total torsional energy level by taking the root mean square of the filtered signal over a predetermined period of time. The total torsional energy level is then compared to a predetermined maximum amplitude and if the total torsional level exceeds this predetermined maximum amplitude then the operator is notified through a display device.
Inventors
- 👤 Kevin M. McGovern
- 👤 David S. Totten
- 👤 Don K. St. John
- 👤 James M. Slicker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:13
CPC Classifications
G; G01; G01H; G01H1/00; G01H1/10; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
107 words
A tool for measuring and analyzing the operation of a rotating component comprising: a sensor for generating a signal having a frequency proportional to the substantially instantaneous speed of a driveline component under test; a electronic control unit electrically coupled to said sensor for receiving said signal, said control unit including means for filtering said signal into a filtered signal and calculating the total torsional energy by taking the root mean square of said filtered signal over a predetermined period of time and comparing said total torsional energy level to a predetermined maximum level and storing vibration information in a memory section of said electronic control unit.
Claim 2
Dependent Claim
107 words
A tool for measuring and analyzing the operation of a rotating component comprising: a sensor for generating a signal having a frequency proportional to the substantially instantaneous speed of a driveline component under test; a electronic control unit electrically coupled to said sensor for receiving said signal, said control unit including means for filtering said signal into a filtered signal and calculating the total torsional energy by taking the root mean square of said filtered signal over a predetermined period of time and comparing said total torsional energy level to a predetermined maximum level and storing vibration information in a memory section of said electronic control unit.
Claim 3
Dependent Claim
24 words
The tool of claim 1, wherein said sensor measures the rotational speed between pairs of evenly spaced adjacent indications on a rotating driveline component.
Claim 4
Dependent Claim
30 words
The tool of claim 1, wherein said vehicle driveline includes a transmission and said sensor generates said signal based on the rotational speed of an output shaft of said transmission.
Claim 5
Dependent Claim
14 words
The tool of claim 3, wherein said electronic control unit also controls said transmission.
Claim 6
Dependent Claim
29 words
The tool of claim 1, further comprising a display electrically connected to said electronic control unit for signaling an operator when said total torsional energy exceeds said maximum level.
Claim 7
Dependent Claim
14 words
The tool of claim 1, wherein said electronic control unit also controls an engine.
Claim 8
Dependent Claim
14 words
The tool of claim 1, where said filtering means is a band pass filter.
Claim 9
Dependent Claim
14 words
The tool of claim 1, where said filtering means is tracked by rotational order.
Claim 10
Independent Claim
119 words
A method of measuring and analyzing the operating of a rotating component comprising the steps of: measuring the rotational speed characteristics of a rotating component and generating a signal having a frequency proportional to the substantially instantaneous speed of said rotating component; filtering said signal into a filtered signal where said filtered signal has a frequency content between a first order of rotation and a higher order of rotation; calculating a total torsional energy value by taking the root mean square of said filtered signal over a preselected period of time; comparing said total torsional energy value to a preselected maximum value and if said total torsional energy value exceeds said preselected maximum then storing vibration information in memory.
Claim 11
Independent Claim
119 words
A method of measuring and analyzing the operating of a rotating component comprising the steps of: measuring the rotational speed characteristics of a rotating component and generating a signal having a frequency proportional to the substantially instantaneous speed of said rotating component; filtering said signal into a filtered signal where said filtered signal has a frequency content between a first order of rotation and a higher order of rotation; calculating a total torsional energy value by taking the root mean square of said filtered signal over a preselected period of time; comparing said total torsional energy value to a preselected maximum value and if said total torsional energy value exceeds said preselected maximum then storing vibration information in memory.
Claim 12
Dependent Claim
16 words
A method of claim 9, wherein said rotating component is a component of a vehicle driveline.
Claim 13
Dependent Claim
16 words
The method of claim 10, wherein said rotating component is an output shaft of a transmission.
Claim 14
Dependent Claim
17 words
The method of claim 9, wherein said high order of rotation is the sixth order of rotation.
Claim 15
Dependent Claim
30 words
The method of claim 9, wherein said rotating component is a transmission output shaft and the rotational speed characteristics of said rotating component is measured using a non-contact magnetic sensor.
Claim 16
Dependent Claim
17 words
The method of claim 9, wherein the filtering of said signal is performed using a Butterworth filter.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-09-20 | 2003-03-22 | 2003-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-09-20 | 2007-03-22 | 2007-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-09-20 | 2011-03-22 | 2011-09-21 | $7700.00 | Window Closed / Lapsed |