Arrangement for the aftertreatment of exhaust gases

Details Arrangement for the aftertreatment of exhaust gases Arrangement for the aftertreatment of exhaust gases

1995-10-12

1997-02-25

Kwon, John T.

Power plants

Internal combustion engine with treatment or handling of...

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

60301, F01N 300

Patent

active

056050429

ABSTRACT:
The invention sets forth an arrangement for the aftertreatment of exhaust gases from a compression-ignition internal combustion engine, in which, to improve the operation of a reducing catalytic converter, a reducing agent is injected into the exhaust gas fed to the catalytic converter. Injection is performed by virtue of an electrically controlled metering valve which is combined in a common housing with a control valve. This control valve serves for the controlled introduction of compressed air supplied, in which a quantity of reducing agent made ready by the metering valve is prepared and introduced intermittently into the exhaust gas. This serves, in particular, to avoid urea deposition and clogging in the metering valve and the control valve and for the optimum preparation of the reducing agent introduced.

REFERENCES:
patent: 3945204 (1976-03-01), Knap
patent: 4321972 (1982-03-01), Achard
patent: 4854123 (1989-08-01), Inoue
patent: 5021227 (1991-06-01), Kobayashi et al.
patent: 5343702 (1994-09-01), Miyajima et al.
patent: 5349816 (1994-09-01), Sanbayashi et al.
Schadstoffreduzierung Und Kraftstoffverbrauch Von PKW-Verbrennungs-Motoren by F. Schaefer and R. Van Basshuysen p. 115.

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