Method and a device for reducing NO.sub.x emissions from a diese

Details Method and a device for reducing NO.sub.x emissions from a diese Method and a device for reducing NO.sub.x emissions from a diese

1996-12-17

1999-04-06

Denion, Thomas E.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60278, 123569, F01N 300

Patent

active

058903593

ABSTRACT:
A method and a device for reducing NO.sub.x emissions from a diesel engine is disclosed. The engine has an inlet system for introducing air into the engine, an exhaust system for exhausting gases from the engine and a branch conduit connecting the exhaust system with the inlet system to permit recirculation of a portion of exhaust gases. A flow control valve is provided which is associated with the branch conduit for regulating the portion of exhaust gases flowing through the branch conduit. The engine further includes control means responsive to particular engine parameters. The control means is employed to effect regulation of the flow control valve based on values of the engine parameters. The control means determine when the engine is running below a predetermined maximum speed, and opens the flow control valve only when the engine is running below the predetermined maximum speed.

REFERENCES:
patent: 4075994 (1978-02-01), Mayer
patent: 4462379 (1984-07-01), Tsuge
patent: 4602606 (1986-07-01), Kawagoe et al.
patent: 5632144 (1997-05-01), Isobe

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