Apparatus and method for diagnosing an engine using a boost pressure model
First Claim
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1. An apparatus for modeling boost pressure of a turbocharger of an engine, the engine having an intake manifold, including:
- means for sensing turbocharger input temperature and responsively producing a turbocharger input temperature signal;
means for sensing turbocharger input pressure and responsively producing an turbocharger input pressure signal;
means for sensing intake manifold temperature and responsively producing an intake manifold temperature signal; and
,means for receiving said turbocharger input temperature and pressure signals and said intake manifold temperature signal and responsively determining a modeled boost pressure value using a boost pressure polynomial function, said turbocharger input temperature and pressure signals and said intake manifold temperature signal being inputs to said boost pressure polynomial function.
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Abstract
An apparatus and method for diagnosing an engine using a computer based model of the boost pressure of a turbo-charger.
74 Citations
14 Claims
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1. An apparatus for modeling boost pressure of a turbocharger of an engine, the engine having an intake manifold, including:
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means for sensing turbocharger input temperature and responsively producing a turbocharger input temperature signal; means for sensing turbocharger input pressure and responsively producing an turbocharger input pressure signal; means for sensing intake manifold temperature and responsively producing an intake manifold temperature signal; and
,means for receiving said turbocharger input temperature and pressure signals and said intake manifold temperature signal and responsively determining a modeled boost pressure value using a boost pressure polynomial function, said turbocharger input temperature and pressure signals and said intake manifold temperature signal being inputs to said boost pressure polynomial function. - View Dependent Claims (2, 3, 4)
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5. An apparatus for providing diagnostics for an engine having a turbocharger and an intake manifold by modeling boost pressure of the turbocharger, including:
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means for sensing turbocharger input temperature and responsively producing a turbocharger input temperature signal; means for sensing turbocharger input pressure and responsively producing an turbocharger input pressure signal; means for sensing intake manifold temperature and responsively producing an intake manifold temperature signal; means for receiving said turbocharger input temperature and pressure signals and said intake manifold temperature signal and responsively determining a modeled boost pressure value using a boost pressure polynomial function, said turbocharger input temperature and pressure signals and said intake manifold temperature signal being inputs to said boost pressure polynomial function; means for sensing actual boost pressure and responsively producing an actual boost pressure signal; and means for receiving said modeled boost pressure value and said actual boost pressure signal and responsively providing engine diagnostics. - View Dependent Claims (6, 7)
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8. A method of creating a computer based model of the boost pressure of a turbocharger on an engine having an air filter and an intake manifold, including the steps of:
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sensing boost pressure on a test engine and responsively producing boost pressure values over a period of time; storing said boost pressure values; and determining respective values for the constants of a boost pressure polynomial function as a function of said stored boost pressure values, wherein said boost pressure polynomial function is;
space="preserve" listing-type="tabular">______________________________________ BOOST.sub.-- PRESSURE = K0 + (K1 * SPEED) + (K2 * RACK) + (K3 * LOAD) + (K4 * TAIR.sub.-- FILTERED) + (K5 * PAIR.sub.-- FILTERED) + (K6 * TINTAKE) + (K7 * (TAIR.sub.-- FILTERED).sup.2 + (K8 * (PAIR.sub.-- FILTERED).sup.2 + (K9 * (TINTAKE).sup.2, ______________________________________where, SPEED is the speed of the engine, RACK, is a measure of fuel input to the engine, LOAD is a measure of load variation, TAIR-- FILTERED, is the temperature of air after the air filter, PAIR-- FILTERED is the pressure of air after the air filter, TINTAKE is the air temperature at the intake manifold and K0-K9 are the polynomial constants. - View Dependent Claims (9)
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10. A method for providing diagnostics of an engine having a turbocharger and an intake manifold by modeling boost pressure of the turbocharger, including:
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sensing turbocharger input temperature and responsively producing a turbocharger input temperature signal; sensing turbocharger input pressure and responsively producing a turbocharger input pressure signal; sensing intake manifold temperature and responsively producing an intake manifold temperature signal; receiving said turbocharger input pressure and temperature signals and said intake manifold temperature signal and responsively determining a modeled boost pressure value using a boost pressure polynomial function, said turbocharger input temperature and pressure signals and said intake manifold temperature signal being inputs to said boost pressure polynomial function; sensing actual boost pressure and responsively producing an actual boost pressure signal; and
,receiving said modeled boost pressure value and said actual boost pressure signal, comparing the model boost pressure value and said actual boost pressure signal, and responsively providing engine diagnostics. - View Dependent Claims (11, 12, 13, 14)
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Specification