Bypass for exhaust gas cooler

Details Bypass for exhaust gas cooler Bypass for exhaust gas cooler

2007-04-03

2007-04-03

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

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

C165S103000, C165S172000

Reexamination Certificate

active

11011844

ABSTRACT:
An exhaust gas recirculation cooler, typically of the drawn cup design, with a bypass and control valve is disclosed. The control valve can direct a proportion of the exhaust gas to the cooler and a proportion to bypass the cooler depending on the input temperature of the exhaust gas and the required temperature of the exhaust gas. The proportion of the exhaust gas directed to the cooler/bypassing the cooler can be varied as required and so the temperature of the exhaust gas can be controlled. One benefit of certain embodiments of the invention is that engine damaging chemicals, such as sulphuric acid, which result from over-cooling the exhaust gas are reduced.

REFERENCES:
patent: 5732688 (1998-03-01), Charlton et al.
patent: 6718956 (2004-04-01), Klipfel et al.
patent: 6868840 (2005-03-01), Lewallen
patent: 7011080 (2006-03-01), Kennedy
patent: 7032577 (2006-04-01), Rosin et al.
patent: 2005/0199381 (2005-09-01), Mercz et al.
patent: 1555421 (2005-07-01), None
patent: 2838500 (2002-10-01), None
patent: WO2006-024495 (2006-03-01), None

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