US6122575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
APU troubleshooting system
Assignee: Hamilton Sundstrand Corp
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Filing: 1999-06-30
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Granted: 2000-09-19
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Expires: 2019-06-30
Abstract
Abstract A system, method, and computer program product assist a technician in troubleshooting an aircraft auxiliary power unit (APU). A portable computer is couplable of download the fault data captured in a memory of the ECU. The fault data corresponds to one or more instances of APU failure. The computer is further programmed to compare the fault data to predetermined fault patterns stored in a database. Each record of the database has one of the fault patterns, a corresponding fault indication, and a corresponding service recommendation indication. The computer is further programmed so that when a record in which the fault pattern matches the fault data is found, the corresponding fault indication and service recommendation are retrieved from the database and provided to the technician via the computer's display or other suitable output mechanism.
Inventors
- 👤 Dennis E. Schmidt
- 👤 Michael D. Hanus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:21
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/22; G06F11/2252; Y; Y10; Y10S; Y10S707/00; Y10S707/99941; Y10S707/99944; Y10S707/99945; Y10S707/99948
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
74 words
A method of diagnosing a failure of an aircraft auxiliary power unit comprising the steps of: downloading fault data from a memory of an electronic control unit of the auxiliary power unit to a computer; comparing the fault data to a plurality of fault patterns accessible to the computer to determine a likelihood of the cause of the failure; and producing an output in accordance with the likelihood of the cause of the failure.
Claim 2
Independent Claim
74 words
A method of diagnosing a failure of an aircraft auxiliary power unit comprising the steps of: downloading fault data from a memory of an electronic control unit of the auxiliary power unit to a computer; comparing the fault data to a plurality of fault patterns accessible to the computer to determine a likelihood of the cause of the failure; and producing an output in accordance with the likelihood of the cause of the failure.
Claim 3
Dependent Claim
55 words
A method in accordance with claim 1 further comprising the steps of: ranking a plurality of possible combinations of faults of the fault data in accordance with the likelihood of the occurrence of the possible combinations of faults to produce a rank; and producing the output in accordance with the possible combinations and the rank.
Claim 4
Dependent Claim
47 words
A method in accordance with claim 2, wherein the step of ranking comprises the steps of: pairing the faults to produce a plurality of combination pairs; and comparing each of the plurality of combination pairs to the fault patterns to determine a likely cause and effect relationship.
Claim 5
Independent Claim
124 words
A method for assisting a technician in troubleshooting an aircraft auxiliary power unit (APU), comprising the steps of: said technician coupling a portable computer to an electronic control unit (ECU) of the APU; said computer downloading fault data captured in a memory of said ECU, said fault data corresponding to an instance of APU failure; said computer comparing said fault data to predetermined fault patterns stored in a database in said computer, said database defined by a plurality of records, each record having one of said fault patterns, a corresponding fault indication, and a corresponding service recommendation indication; and said computer providing to said technician a fault indication and a service recommendation indication corresponding to one of said fault patterns matching said fault data.
Claim 6
Independent Claim
124 words
A method for assisting a technician in troubleshooting an aircraft auxiliary power unit (APU), comprising the steps of: said technician coupling a portable computer to an electronic control unit (ECU) of the APU; said computer downloading fault data captured in a memory of said ECU, said fault data corresponding to an instance of APU failure; said computer comparing said fault data to predetermined fault patterns stored in a database in said computer, said database defined by a plurality of records, each record having one of said fault patterns, a corresponding fault indication, and a corresponding service recommendation indication; and said computer providing to said technician a fault indication and a service recommendation indication corresponding to one of said fault patterns matching said fault data.
Claim 7
Dependent Claim
119 words
The method claimed in claim 4, further comprising the steps of: said computer searching said fault data to determine historical fault data corresponding to a plurality of sequential instances of APU failures; said computer evaluating said historical fault data in accordance with a predetermined algorithm to determine fault data caused by said instance of APU failure and fault data that are the effect of said instance of APU failure; and wherein said step of said computer providing to said technician a fault indication and a service recommendation indication comprises providing a fault indication and a service recommendation indication corresponding to one of said fault patterns matching said fault data determined to be caused by said instance of APU failure.
Claim 8
Dependent Claim
15 words
The method claimed in claim 5, wherein said fault patterns include engine operating parameter data.
Claim 9
Dependent Claim
29 words
The method claimed in claim 6, wherein said engine operating parameter data is selected from the group consisting of engine speed, exhaust gas temperature, ambient temperature and ambient pressure.
Claim 10
Dependent Claim
15 words
The method claimed in claim 4, wherein said fault patterns include engine operating parameter data.
Claim 11
Dependent Claim
29 words
The method claimed in claim 8, wherein said engine operating parameter data is selected from the group consisting of engine speed, exhaust gas temperature, ambient temperature and ambient pressure.
Claim 12
Dependent Claim
66 words
The method claimed in claim 4, further comprising the steps of: said computer determining whether more than one of said fault patterns matches said fault data; and if more than one of said fault patterns matches said fault data, said computer providing to said technician in order of likelihood a plurality of fault indications and service recommendations indications corresponding to said fault patterns matching said data.
Claim 13
Dependent Claim
57 words
The method claimed in claim 10, wherein each record in said database has a likelihood estimation rank, and said step of said computer providing to said technician in order of likelihood a plurality of fault indications and service recommendations indications corresponding to said fault patterns matching said data is performed in response to said likelihood estimation rank.
Claim 14
Dependent Claim
22 words
A method in accordance with claim 11 further comprising the step of determining the likelihood estimation rank based on grouping of faults.
Claim 15
Dependent Claim
26 words
A method in accordance with claim 12 wherein the grouping of faults is based on the likelihood of a fault being caused by a second fault.
Claim 16
Independent Claim
136 words
A system for assisting a technician in troubleshooting an aircraft auxiliary power unit (APU), comprising: a portable computer couplable to an electronic control unit (ECU) of the APU and programmed to include downloading means, comparing means and indicating means; said downloading means for downloading fault data captured in a memory of said ECU, said fault data corresponding to an instance of APU failure; said comparing means for comparing said fault data to predetermined fault patterns stored in a database in said computer, said database defined by a plurality of records, each record having one of said fault patterns, a corresponding fault indication, and a corresponding service recommendation indication; and said indicating means for providing to said technician a fault indication and a service recommendation indication corresponding to one of said fault patterns matching said fault data.
Claim 17
Independent Claim
136 words
A system for assisting a technician in troubleshooting an aircraft auxiliary power unit (APU), comprising: a portable computer couplable to an electronic control unit (ECU) of the APU and programmed to include downloading means, comparing means and indicating means; said downloading means for downloading fault data captured in a memory of said ECU, said fault data corresponding to an instance of APU failure; said comparing means for comparing said fault data to predetermined fault patterns stored in a database in said computer, said database defined by a plurality of records, each record having one of said fault patterns, a corresponding fault indication, and a corresponding service recommendation indication; and said indicating means for providing to said technician a fault indication and a service recommendation indication corresponding to one of said fault patterns matching said fault data.
Claim 18
Dependent Claim
15 words
The system claimed in claim 14, wherein said fault patterns include engine operating parameter data.
Claim 19
Dependent Claim
29 words
The system claimed in claim 15, wherein said engine operating parameter data is selected from the group consisting of engine speed, exhaust gas temperature, ambient temperature and ambient pressure.
Claim 20
Dependent Claim
72 words
The system claimed in claim 14, wherein said computer is programmed to further comprise: multiple fault means for determining whether more than one of said fault patterns matches said fault data; and said indicating means provides to said technician in order of likelihood a plurality of fault indications and service recommendations indications corresponding to said fault patterns matching said data if more than one of said fault patterns matches said fault data.
Claim 21
Dependent Claim
46 words
The system claimed in claim 17, wherein each record in said database has a likelihood estimation rank, and said indicating means provides said plurality of fault indications and service recommendations indications corresponding to said fault patterns matching said data in response to said likelihood estimation rank.
Claim 22
Dependent Claim
111 words
The system claimed in claim 14, wherein said computer is programmed to further comprise: historical searching means for searching said fault data to determine historical fault data corresponding to a plurality of sequential instances of APU failures; historical evaluation means for evaluating said historical fault data in accordance with a predetermined algorithm to determine fault data caused by said instance of APU failure and fault data that are the effect of said instance of APU failure; and wherein said indicating means provides a fault indication and a service recommendation indication corresponding to one of said fault patterns matching said fault data determined to be caused by said instance of APU failure.
Claim 23
Dependent Claim
15 words
The system claimed in claim 19, wherein said fault patterns include engine operating parameter data.
Claim 24
Dependent Claim
29 words
The system claimed in claim 20, wherein said engine operating parameter data is selected from the group consisting of engine speed, exhaust gas temperature, ambient temperature and ambient pressure.
Claim 25
Dependent Claim
120 words
A computer program product for assisting a technician in troubleshooting an aircraft auxiliary power unit (APU), said computer program product comprising: a computer-readable medium carrying thereon: downloading means for downloading fault data captured in a memory of said ECU, said fault data corresponding to an instance of APU failure; comparing means for comparing said fault data to predetermined fault patterns stored in a database in said computer, said database defined by a plurality of records, each record having one of said fault patterns, a corresponding fault indication, and a corresponding service recommendation indication; and indicating means for providing to said technician a fault indication and a service recommendation indication corresponding to one of said fault patterns matching said fault data.
Claim 26
Dependent Claim
120 words
A computer program product for assisting a technician in troubleshooting an aircraft auxiliary power unit (APU), said computer program product comprising: a computer-readable medium carrying thereon: downloading means for downloading fault data captured in a memory of said ECU, said fault data corresponding to an instance of APU failure; comparing means for comparing said fault data to predetermined fault patterns stored in a database in said computer, said database defined by a plurality of records, each record having one of said fault patterns, a corresponding fault indication, and a corresponding service recommendation indication; and indicating means for providing to said technician a fault indication and a service recommendation indication corresponding to one of said fault patterns matching said fault data.
Claim 27
Dependent Claim
15 words
The system claimed in claim 22, wherein said fault patterns include engine operating parameter data.
Claim 28
Dependent Claim
29 words
The system claimed in claim 23, wherein said engine operating parameter data is selected from the group consisting of engine speed, exhaust gas temperature, ambient temperature and ambient pressure.
Claim 29
Dependent Claim
72 words
The system claimed in claim 22, wherein said computer is programmed to further comprise: multiple fault means for determining whether more than one of said fault patterns matches said fault data; and said indicating means provides to said technician in order of likelihood a plurality of fault indications and service recommendations indications corresponding to said fault patterns matching said data if more than one of said fault patterns matches said fault data.
Claim 30
Dependent Claim
46 words
The system claimed in claim 25, wherein each record in said database has a likelihood estimation rank, and said indicating means provides said plurality of fault indications and service recommendations indications corresponding to said fault patterns matching said data in response to said likelihood estimation rank.
Claim 31
Dependent Claim
111 words
The system claimed in claim 22, wherein said computer is programmed to further comprise: historical searching means for searching said fault data to determine historical fault data corresponding to a plurality of sequential instances of APU failures; historical evaluation means for evaluating said historical fault data in accordance with a predetermined algorithm to determine fault data caused by said instance of APU failure and fault data that are the effect of said instance of APU failure; and wherein said indicating means provides a fault indication and a service recommendation indication corresponding to one of said fault patterns matching said fault data determined to be caused by said instance of APU failure.
Claim 32
Dependent Claim
15 words
The system claimed in claim 27, wherein said fault patterns include engine operating parameter data.
Claim 33
Dependent Claim
29 words
The system claimed in claim 28, wherein said engine operating parameter data is selected from the group consisting of engine speed, exhaust gas temperature, ambient temperature and ambient pressure.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-09-19 | 2004-03-20 | 2004-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-09-19 | 2008-03-20 | 2008-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-09-19 | 2012-03-20 | 2012-09-19 | $7700.00 | Window Closed / Lapsed |