US5646341A
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US
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Apparatus and method for diagnosing an engine using an oil pressure model
Assignee: Caterpillar Inc
•
Filing: 1995-07-28
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Granted: 1997-07-08
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Expires: 2015-07-28
Abstract
Abstract An apparatus and method for diagnosing an engine using a computer based model of the engine oil pressure.
Inventors
- 👤 David R. Schricker
- 👤 Rolland D. Scholl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:31
CPC Classifications
F; F01; F01M; F01M11/00; F01M11/10; F01M2250/00; F01M2250/64; F16; F16N; F16N2230/00; F16N2230/02; F16N2250/00; F16N2250/04; F16N2250/08
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
73 words
An apparatus for modeling oil pressure of an engine, including: means for sensing engine speed and responsively producing an engine speed signal; means for sensing engine oil temperature and responsively producing an engine oil temperature signal; means for receiving said engine speed signal and said engine oil temperature signal and responsively determining a modeled engine oil pressure value using an oil pressure polynomial function and said engine speed and engine oil temperature signals.
Claim 2
Independent Claim
73 words
An apparatus for modeling oil pressure of an engine, including: means for sensing engine speed and responsively producing an engine speed signal; means for sensing engine oil temperature and responsively producing an engine oil temperature signal; means for receiving said engine speed signal and said engine oil temperature signal and responsively determining a modeled engine oil pressure value using an oil pressure polynomial function and said engine speed and engine oil temperature signals.
Claim 3
Dependent Claim
43 words
An apparatus, as set forth in claim 1, including: means for sensing actual oil pressure and responsively producing an actual oil pressure signal; and means for receiving said modeled oil pressure value and said actual oil pressure signal and responsively providing engine diagnostics.
Claim 4
Dependent Claim
46 words
An apparatus, as set forth in claim 2, wherein said engine diagnostics providing means includes means for comparing said modeled engine oil pressure value and said actual oil pressure signal and responsively producing a difference signal and for comparing said difference signal to a preset limit.
Claim 5
Independent Claim
126 words
An apparatus for providing diagnostics for an engine by modeling engine oil pressure, including: means for sensing engine speed and responsively producing an engine speed signal; means for sensing engine oil temperature and responsively producing an engine oil temperature signal; means for receiving said engine speed signal and said engine oil temperature signal and responsively determining a modeled engine oil pressure value using an oil pressure polynomial function and said engine speed and engine oil temperature signals; means for sensing actual oil pressure and responsively producing an actual oil pressure signal; and means for receiving said modeled engine oil pressure value and said actual oil pressure signal, comparing said modeled engine oil pressure value and said actual engine oil pressure signal, and responsively providing engine diagnostics.
Claim 6
Independent Claim
126 words
An apparatus for providing diagnostics for an engine by modeling engine oil pressure, including: means for sensing engine speed and responsively producing an engine speed signal; means for sensing engine oil temperature and responsively producing an engine oil temperature signal; means for receiving said engine speed signal and said engine oil temperature signal and responsively determining a modeled engine oil pressure value using an oil pressure polynomial function and said engine speed and engine oil temperature signals; means for sensing actual oil pressure and responsively producing an actual oil pressure signal; and means for receiving said modeled engine oil pressure value and said actual oil pressure signal, comparing said modeled engine oil pressure value and said actual engine oil pressure signal, and responsively providing engine diagnostics.
Claim 7
Dependent Claim
38 words
An apparatus, as set forth in claim 4, wherein said engine diagnostics providing means includes means for comparing the difference between the actual engine oil pressure signal and said modeled engine oil pressure value to a preset limit.
Claim 8
Dependent Claim
28 words
An apparatus, as set forth in claim 5, wherein said engine diagnostics providing means includes means for capturing said difference signal and storing said difference signal over time.
Claim 9
Independent Claim
72 words
A method of creating a computer based model of an engine oil pressure of an engine, including the steps of: sensing engine oil pressure on a test engine and responsively producing engine oil pressure values over a period of time; storing said engine oil pressure values; and determining respective values for a set of constants of an engine oil pressure polynomial function as a function of said stored engine oil pressure values.
Claim 10
Independent Claim
72 words
A method of creating a computer based model of an engine oil pressure of an engine, including the steps of: sensing engine oil pressure on a test engine and responsively producing engine oil pressure values over a period of time; storing said engine oil pressure values; and determining respective values for a set of constants of an engine oil pressure polynomial function as a function of said stored engine oil pressure values.
Claim 11
Independent Claim
81 words
A method of creating a computer based model of an engine oil pressure of an engine, including the steps of: sensing engine oil pressure on a test engine and responsively producing engine oil pressure values over a period of time; storing said engine oil pressure values; and determining respective values for a set of constants of an engine oil pressure polynomial function as a function of said stored engine oil pressure values using a regression method based on least square error.
Claim 12
Independent Claim
81 words
A method of creating a computer based model of an engine oil pressure of an engine, including the steps of: sensing engine oil pressure on a test engine and responsively producing engine oil pressure values over a period of time; storing said engine oil pressure values; and determining respective values for a set of constants of an engine oil pressure polynomial function as a function of said stored engine oil pressure values using a regression method based on least square error.
Claim 13
Independent Claim
126 words
A method of creating a computer based model of an engine oil pressure of an engine, including the steps of: sensing engine oil pressure on a test engine and responsively producing engine oil pressure values over a period of time; storing said engine oil pressure values; and determining respective values for a set of constants of an engine oil pressure polynomial function as a function of said stored engine oil pressure values, wherein said engine oil pressure polynomial function is: ______________________________________
PREDICTED.sub.-- OIL.sub.-- PRESSURE =
C0 + (C1 * SPEED)
+ (C2 * OIL.sub.TEMPERATURE)
+ (C3 * (OIL.sub.TEMPERATURE).sup.2)
+ (C4 * OIL.sub.TEMPERATURE * .sub.SPEED)
______________________________________ where, SPEED is the speed of the engine, OIL TEMPERATURE is the measured oil temperature and C0-C4 are the polynomial constants.
Claim 14
Independent Claim
126 words
A method of creating a computer based model of an engine oil pressure of an engine, including the steps of: sensing engine oil pressure on a test engine and responsively producing engine oil pressure values over a period of time; storing said engine oil pressure values; and determining respective values for a set of constants of an engine oil pressure polynomial function as a function of said stored engine oil pressure values, wherein said engine oil pressure polynomial function is: ______________________________________
PREDICTED.sub.-- OIL.sub.-- PRESSURE =
C0 + (C1 * SPEED)
+ (C2 * OIL.sub.TEMPERATURE)
+ (C3 * (OIL.sub.TEMPERATURE).sup.2)
+ (C4 * OIL.sub.TEMPERATURE * .sub.SPEED)
______________________________________ where, SPEED is the speed of the engine, OIL TEMPERATURE is the measured oil temperature and C0-C4 are the polynomial constants.
Claim 15
Independent Claim
111 words
A method for providing diagnostics of an engine, including: sensing engine speed and responsively producing an engine speed signal; sensing engine oil temperature and responsively producing an engine oil temperature signal; receiving said engine speed signal and said engine oil temperature signal and responsively determining a modeled engine oil pressure value using an oil pressure polynomial function and said engine speed and engine oil temperature signals; sensing actual oil pressure and responsively producing an actual oil pressure signal; and receiving said modeled engine oil pressure value and said actual oil pressure signal, comparing said modeled engine oil pressure value and said actual engine oil pressure signal, and responsively providing engine diagnostics.
Claim 16
Independent Claim
111 words
A method for providing diagnostics of an engine, including: sensing engine speed and responsively producing an engine speed signal; sensing engine oil temperature and responsively producing an engine oil temperature signal; receiving said engine speed signal and said engine oil temperature signal and responsively determining a modeled engine oil pressure value using an oil pressure polynomial function and said engine speed and engine oil temperature signals; sensing actual oil pressure and responsively producing an actual oil pressure signal; and receiving said modeled engine oil pressure value and said actual oil pressure signal, comparing said modeled engine oil pressure value and said actual engine oil pressure signal, and responsively providing engine diagnostics.
Claim 17
Dependent Claim
28 words
A method, as set forth in claim 10, including the step of determining a difference signal between said model oil pressure value and said actual oil pressure signal.
Claim 18
Dependent Claim
18 words
A method, as set forth in claim 11, including the step of storing said difference signal over time.
Claim 19
Dependent Claim
39 words
A method, as set forth in claim 11, wherein said step of providing engine diagnostics includes the steps of: comparing said difference signal to a preset limit; and, signaling an error when said difference signal exceeds said preset limit.
Claim 20
Independent Claim
73 words
An apparatus for modeling oil pressure of an engine, including: means for sensing engine speed and responsively producing an engine speed signal; means for sensing engine coolant temperature and responsively producing an engine coolant temperature signal; means for receiving said engine speed signal and said engine coolant temperature signal and responsively determining a modeled engine oil pressure value using an oil pressure polynomial function and said engine speed and engine coolant temperature signals.
Claim 21
Independent Claim
73 words
An apparatus for modeling oil pressure of an engine, including: means for sensing engine speed and responsively producing an engine speed signal; means for sensing engine coolant temperature and responsively producing an engine coolant temperature signal; means for receiving said engine speed signal and said engine coolant temperature signal and responsively determining a modeled engine oil pressure value using an oil pressure polynomial function and said engine speed and engine coolant temperature signals.
Claim 22
Independent Claim
72 words
A method of creating a computer based model of an engine oil pressure of an engine, including the steps of: sensing engine oil pressure on a test engine and responsively producing engine oil pressure values over a period of time; storing said engine oil pressure values; and determining respective values for a set of constants of an engine oil pressure polynomial function as a function of said stored engine oil pressure values.
Claim 23
Independent Claim
72 words
A method of creating a computer based model of an engine oil pressure of an engine, including the steps of: sensing engine oil pressure on a test engine and responsively producing engine oil pressure values over a period of time; storing said engine oil pressure values; and determining respective values for a set of constants of an engine oil pressure polynomial function as a function of said stored engine oil pressure values.
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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) | 2000-07-07 | 2001-01-06 | 2001-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-07-07 | 2005-01-06 | 2005-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-07-07 | 2009-01-06 | 2009-07-08 | $7700.00 | Window Closed / Lapsed |