System for diagnosing operation of an EGR cooler
First Claim
1. System for diagnosing operation of an exhaust gas recirculation (EGR) cooler, comprising:
- an engine having an intake manifold, an exhaust manifold and an EGR conduit fluidly coupled between said intake and exhaust manifolds, said engine including a cooling system having a coolant fluid circulating therethrough to cool said engine;
an EGR cooler disposed in-line with said EGR conduit such that exhaust gas flowing through said EGR conduit also flows through said EGR cooler, said EGR cooler coupled to said cooling system such that said coolant fluid circulates through said EGR cooler to cool exhaust gas flowing therethrough;
means for determining a temperature of exhaust gas produced by said engine;
means for determining a temperature of exhaust gas exiting an exhaust gas outlet of said EGR cooler;
means for determining a temperature of said coolant fluid circulating through said engine cooling system and said EGR cooler;
means for determining a flow rate of exhaust gas through said EGR conduit; and
means for diagnosing operation said EGR cooler as a function of said temperature of exhaust gas produced by said engine, said temperature of exhaust gas exiting said EGR cooler, said temperature of said coolant fluid and said flow rate of exhaust gas through said EGR conduit.
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Abstract
A system is disclosed for diagnosing operation of an EGR cooler disposed in-line with an EGR conduit fluidly coupled between an intake manifold and an exhaust manifold of the engine such that exhaust gas flowing through the EGR conduit also flows through the EGR cooler. The EGR cooler is coupled to an engine cooling system such that coolant fluid circulating through the engine also circulates through the EGR cooler. Means are provided for determining a temperature of exhaust gas produced by the engine, a temperature of exhaust gas exiting the EGR cooler, a temperature of the coolant fluid and a flow rate of exhaust gas through the EGR conduit. A control computer is configured to diagnose operation the EGR cooler as a function of the temperature of exhaust gas produced by the engine, the EGR cooler outlet temperature, the engine coolant temperature and the EGR flow rate.
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Citations
48 Claims
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1. System for diagnosing operation of an exhaust gas recirculation (EGR) cooler, comprising:
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an engine having an intake manifold, an exhaust manifold and an EGR conduit fluidly coupled between said intake and exhaust manifolds, said engine including a cooling system having a coolant fluid circulating therethrough to cool said engine;
an EGR cooler disposed in-line with said EGR conduit such that exhaust gas flowing through said EGR conduit also flows through said EGR cooler, said EGR cooler coupled to said cooling system such that said coolant fluid circulates through said EGR cooler to cool exhaust gas flowing therethrough;
means for determining a temperature of exhaust gas produced by said engine;
means for determining a temperature of exhaust gas exiting an exhaust gas outlet of said EGR cooler;
means for determining a temperature of said coolant fluid circulating through said engine cooling system and said EGR cooler;
means for determining a flow rate of exhaust gas through said EGR conduit; and
means for diagnosing operation said EGR cooler as a function of said temperature of exhaust gas produced by said engine, said temperature of exhaust gas exiting said EGR cooler, said temperature of said coolant fluid and said flow rate of exhaust gas through said EGR conduit. - 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. System for diagnosing operation of an exhaust gas recirculation (EGR) cooler, comprising:
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an engine having an intake manifold, an exhaust manifold and an EGR conduit fluidly coupled between said intake and exhaust manifolds, said engine including a cooling system having a coolant fluid circulating therethrough to cool said engine;
an EGR cooler disposed in-line with said EGR conduit such that exhaust gas flowing through said EGR conduit also flows through said EGR cooler, said EGR cooler coupled to said cooling system such that said coolant fluid circulates through said EGR cooler to cool exhaust gas flowing therethrough;
means for determining a temperature of exhaust gas produced by said engine;
a first temperature sensor producing an EGR cooler outlet temperature signal indicative of exhaust gas temperature exiting an exhaust gas outlet of said EGR cooler;
a second temperature sensor producing an engine coolant temperature signal indicative of temperature of said coolant fluid;
means for determining a flow rate of exhaust gas through said EGR conduit; and
a control computer configured to diagnose operation said EGR cooler as a function of said temperature of exhaust gas produced by said engine, said EGR cooler outlet temperature signal, said engine coolant temperature signal and said flow rate of exhaust gas through said EGR conduit. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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Specification