Exhaust gas purification device for internal combustion engine

Details Exhaust gas purification device for internal combustion engine Exhaust gas purification device for internal combustion engine

1999-07-01

2002-04-09

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S297000, C060S289000, C060S301000, C055SDIG003, C055S283000

Reexamination Certificate

active

06367246

ABSTRACT:

TECHNICAL FIELD
The present invention relates to an exhaust gas purification device for an internal combustion engine.
BACKGROUND ART
Japanese Unexamined Patent Publication (Kokai) No. 6-159037 discloses an exhaust gas purification device, for a diesel engine, in which a filter for trapping particulates in the exhaust gas is arranged in the exhaust passage of the engine and both of the upstream and downstream side surfaces of the filter with respect to the exhaust gas flow are covered with a NO
x
storing member for storing the nitrogen oxide NO
x
temporarily. Generally, the exhaust gas of the diesel engine contains particulates, i.e. the soot (carbon) and soluble organic components (SOF), and NO
x
. Releasing these particulates into the atmosphere is not desirable. For this reason, the exhaust purification device traps the particulates in a filter and stores NO
x
in the accumulation member.
The NO
x
storing member covering the upstream side surface of the filter with respect to the exhaust gas flow, however, comes into contact with the exhaust gas containing the particulates. The problem, therefore, is that once the NO
x
storing member is poisoned by the particulates, it cannot satisfactorily store NO
x
any longer.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide an exhaust gas purification device capable of securing the NO
x
storage capacity of the NO
x
storing member.
According to the present invention, there is provided an exhaust gas purification device, for an internal combustion engine having an exhaust passage, comprising a filter arranged in the exhaust gas passage for trapping the particulates in the inflowing exhaust gas and a NO
x
storing member arranged only on the downstream side surface of the filter with respect to the exhaust gas for temporarily storing the NO
x
in the inflowing exhaust gas therein.


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