Exhaust gas recirculation (EGR) system

Internal-combustion engines – Charge forming device – Exhaust gas used with the combustible mixture

Reexamination Certificate

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Details

C123S568160, C123S698000, C060S605200, C702S183000, C165S095000

Reexamination Certificate

active

08056544

ABSTRACT:
A method for operating an internal combustion engine Exhaust Gas Recirculation (EGR) system that includes producing an EGR valve position signal to decrease the amount of exhaust gas passed to the EGR cooler when a processor determines the EGR cooler efficiency is less than the predetermined level and producing an EGR coolant valve position signal to decrease the amount of coolant passed to the EGR cooler when such processor determines the EGR cooler efficiency is less than the predetermined level. The processor produced EGR valve and the EGR coolant valve position signals result in regeneration within the cooler, returning the effectiveness of the cooler to a near “clean” condition.

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