Method for diagnosing an engine using computer based models
First Claim
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1. A method for diagnosing an engine, including the steps of:
- sensing a first operating characteristic of said engine and responsively delivering a first operating characteristic signal;
sensing at least one parameter of said engine and responsively producing at least one parameter signal;
receiving said at least one parameter signal and responsively determining a modeled value of said first operating characteristic;
receiving said first operating characteristic signal, comparing said first operating characteristic signal and said first operating characteristic modeled value and responsively producing a first difference signal;
sensing a second operating characteristic of said engine and responsively delivering a second operating characteristic signal;
sensing at least one other parameter of said engine and responsively producing at least one other parameter signal;
receiving said at least one other parameter signal and responsively determining a modeled value of said second operating characteristic;
receiving said second operating characteristic signal, comparing said second operating characteristic signal and said second operating characteristic modeled value and responsively producing a second difference signal; and
receiving said first and second difference signals, comparing said first and second difference signals, and responsively diagnosing said engine.
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Abstract
A method for diagnosing an engine (102) including the steps of sensing a first set of parameters of the engine (102) and determining a modeled value of a first operating characteristic. A second set of parameters of the engine (102) is sensed and used to determined a modeled value of a second operating characteristic. The modeled values are compared to actual values and the engine is responsively diagnosed.
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Citations
53 Claims
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1. A method for diagnosing an engine, including the steps of:
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sensing a first operating characteristic of said engine and responsively delivering a first operating characteristic signal; sensing at least one parameter of said engine and responsively producing at least one parameter signal; receiving said at least one parameter signal and responsively determining a modeled value of said first operating characteristic; receiving said first operating characteristic signal, comparing said first operating characteristic signal and said first operating characteristic modeled value and responsively producing a first difference signal; sensing a second operating characteristic of said engine and responsively delivering a second operating characteristic signal; sensing at least one other parameter of said engine and responsively producing at least one other parameter signal; receiving said at least one other parameter signal and responsively determining a modeled value of said second operating characteristic; receiving said second operating characteristic signal, comparing said second operating characteristic signal and said second operating characteristic modeled value and responsively producing a second difference signal; and receiving said first and second difference signals, comparing said first and second difference signals, and responsively diagnosing said engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method for diagnosing an engine having an exhaust manifold and a turbocharger, including the steps of:
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sensing an exhaust temperature of said exhaust manifold and responsively delivering an exhaust temperature signal; sensing at least one parameter of said engine and responsively producing at least one parameter signal; receiving said at least one parameter signal and responsively determining a modeled exhaust temperature value; receiving said exhaust temperature signal, comparing said exhaust temperature signal and said modeled exhaust temperature value and responsively producing a first difference signal; sensing a boost pressure of said turbocharger and responsively delivering a boost pressure signal; sensing at least one other parameter of said engine and responsively producing at least one other parameter signal; receiving said at least one other parameter signal and responsively determining a modeled boost pressure value; receiving said boost pressure signal, comparing said boost pressure signal and said modeled boost pressure value and responsively producing a second difference signal; and receiving said first and second difference signals, comparing said first and second difference signals, and responsively diagnosing said engine. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. A method for diagnosing an engine having a turbocharger and a plurality of cylinders, each cylinder having an associated piston, including the steps of:
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determining the volumetric efficiency of said engine and responsively producing a volumetric efficiency signal indicative of the mass flow efficiency of said engine; determining the fuel to air ratio and responsively producing a fuel to air ratio signal; receiving said fuel to air ration signal and said volumetric efficiency signal, responsively determining the power delivered to the pistons, and producing a brake power signal indicative of said determined power; determining the heat lost through said cylinders and responsively producing a cylinder heat loss signal; receiving said cylinder heat loss signal, responsively determining the temperature of the exhaust gas and producing a modeled exhaust temperature signal indicative of said determined temperature; sensing the actual exhaust temperature and responsively producing an actual exhaust temperature signal; receiving said modeled exhaust temperature signal and said actual exhaust temperature signal, comparing said modeled and actual exhaust temperature signals and responsively producing a first difference signal; initializing a turbine speed to a predetermined value; determining an intake manifold air temperature and responsively producing an intake manifold air temperature signal, respectively; receiving said intake manifold air temperature signal and responsively determining the mass flow rate into the engine and responsively producing a mass flow signal; determining a filtered air pressure and temperature and responsively producing filtered air pressure and temperature signals, respectively; receiving said mass flow signal, turbine speed, said filtered air pressure and temperature signals, and said intake manifold air temperature signal and responsively producing a modeled boost pressure signal; sensing an actual boost pressure and responsively producing an actual boost pressure signal; receiving said modeled and actual boost pressure signals and responsively producing a second difference signal; receiving said first and second difference signals, comparing said first and second difference signals, and responsively diagnosing said engine. - View Dependent Claims (48, 49, 50, 51, 52, 53)
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Specification