Internal-combustion engines – Charge forming device – Exhaust gas used with the combustible mixture
Patent
1997-10-31
2000-12-26
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Exhaust gas used with the combustible mixture
13761417, 1376142, F02M 2507, F16K 1518
Patent
active
06164269&
ABSTRACT:
An EGR valve assembly for an internal combustion engine includes a check valve which allows the use of EGR under conditions where the average pressure of exhaust gases in the exhaust manifold is less than the average pressure of air in the intake manifold. The check valve allows pressure pulses in the exhaust manifold to advance exhaust gases from the exhaust manifold to the intake manifold while preventing the back flow of air from the intake manifold to the exhaust manifold. The EGR valve assembly further includes a housing defining a chamber. The housing further defines a housing outlet and a housing inlet both which are fluid communication with the chamber. The valve assembly further includes a master valve positioned within the chamber. The master valve is positionable between a first master position and a second master position. The check valve is (1) movable between a first check position and a second check position when the master valve is positioned in the second master position, and (2) maintained in the first check position when the master valve is positioned in the first master position. A method of controlling a flow of engine exhaust in an internal combustion engine is also disclosed.
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Arulraja Mylvaganam
Feucht Dennis D.
Caterpillar Inc.
Wolfe Willis R.
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