System for diagnosing operation of an EGR cooler

Details System for diagnosing operation of an EGR cooler System for diagnosing operation of an EGR cooler

2005-02-01

2005-02-01

Wolfe, Jr., Willis R. (Department: 3747)

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

C123S568160, C060S605200

Reexamination Certificate

active

06848434

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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