Apparatus and method for diagnosing an engine using an oil pressure model
First Claim
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1. 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.
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Abstract
An apparatus and method for diagnosing an engine using a computer based model of the engine oil pressure.
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Citations
15 Claims
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1. An apparatus for modeling oil pressure of an engine, including:
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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. - View Dependent Claims (2, 3)
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4. An apparatus for providing diagnostics for an engine by modeling engine oil pressure, including:
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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. - View Dependent Claims (5, 6)
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7. A method of creating a computer based model of an engine oil pressure of an engine, including the steps of:
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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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8. A method of creating a computer based model of an engine oil pressure of an engine, including the steps of:
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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.
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9. A method of creating a computer based model of an engine oil pressure of an engine, including the steps of:
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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;
space="preserve" listing-type="tabular">______________________________________ 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, OILTEMPERATURE is the measured oil temperature and C0-C4 are the polynomial constants.
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10. A method for providing diagnostics of an engine, including:
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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. - View Dependent Claims (11, 12, 13)
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14. An apparatus for modeling oil pressure of an engine, including:
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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.
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15. A method of creating a computer based model of an engine oil pressure of an engine, including the steps of:
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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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Specification