EXHAUST EMISSION CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

WIPO Patent Application WO/1999/067511

A1

A catalyst (22) suitable for reducing NO¿x? in an exhaust gas by using ammonia in the presence of an excessive oxygen is disposed in an exhaust passage (18, 21). A urea solution is supplied via a flow rate control valve (33) into the exhaust passage (21) upstream of the catalyst (22). When the catalyst (22) is low in temperature, a large amount of a urea solution is supplied to store urea contained in the urea solution in the catalyst (22). When the temperature of the catalyst (22) rises due to an acceleration operation, ammonia is released from the catalyst (22) little by little to reduce NO¿x? in the exhaust gas by the released ammonia.

HIROTA SHINYA (JP)
ITOH KAZUHIRO (JP)
TANAKA TOSHIAKI (JP)
IWASAKI EIJI (JP)

PCT/JP1999/003349

December 29, 1999

June 23, 1999

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TOYOTA MOTOR CO LTD (JP)
HIROTA SHINYA (JP)
ITOH KAZUHIRO (JP)
TANAKA TOSHIAKI (JP)
IWASAKI EIJI (JP)

B01D53/90; B01D53/94; C01B21/00; F01N3/00; F01N3/10; F01N3/20; F01N3/08; F01N3/24; F01N3/28; F01N11/00; F02D21/08; F02D41/00; F02D41/02; F02D41/12; F02M25/06; F02M25/07; F01N13/02; F01N13/04; (IPC1-7): F01N3/08; F01N3/24; F01N3/10; F01N3/28; F02M25/07; B01D53/94

JPH0757303B2	1995-06-21
JPH0411248B2	1992-02-27
JPH0712660Y2	1995-03-29
JPH05317725A	1993-12-03
JPH07232035A	1995-09-05
JPH09173782A	1997-07-08
JPH05285343A	1993-11-02
JPH06294318A	1994-10-21
JPS6357810A	1988-03-12
JP2722990B2	1998-03-09
JPH08121154A	1996-05-14
JPH05296029A	1993-11-09

See also references of EP 1106799A4
None

Ishida, Takashi (Ishida & Associates Toranomon 37 Mori Building 5-1, Toranomon 3-chome Minato-ku Tokyo, JP)

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