Internal EGR cooler

Details Internal EGR cooler Internal EGR cooler

2005-08-23

2005-08-23

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

C123S568150

Reexamination Certificate

active

06932063

ABSTRACT:
One aspect of the invention relates to cooled internal EGR. Cooled internal EGR is achieved by selectively admitting exhaust to an intake manifold. A heat exchanger is used to cool the exhaust within the intake manifold. Another aspect of the invention related to an intake manifold adapted for internal EGR cooling. The manifold has a bulge to retain exhaust, whereby the exhaust admitted to the intake side for internal EGR generally does not flow past the intake manifold and significantly heat or foul any upstream portion of the system. The manifold further includes a heat exchanger for cooling the exhaust. A further aspect of the invention relates to a method of reducing the response time of an EGR system. The method comprises providing a temporary increase in an internal EGR rate during a transition from a first to a second external EGR rate.

REFERENCES:
patent: 4258687 (1981-03-01), Mauch et al.
patent: 4267812 (1981-05-01), Aula et al.
patent: 5546914 (1996-08-01), Scheinert
patent: 6170474 (2001-01-01), Israel
patent: 6360732 (2002-03-01), Bailey et al.
patent: 6543411 (2003-04-01), Raab et al.
patent: 6742506 (2004-06-01), Grandin
patent: 6807937 (2004-10-01), Gianolio et al.
patent: 2003/0140876 (2003-07-01), Yang et al.

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