Exhaust purifier of internal combustion engine

Details Exhaust purifier of internal combustion engine Exhaust purifier of internal combustion engine

1996-11-05

1998-09-29

Tran, Hien

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Waste gas purifier

422171, 422174, 422177, 422199, 422110, 60289, 60300, 60306, F01N 322, B01D 5334, G05D 700

Patent

active

058142835

ABSTRACT:
An exhaust purifier of an internal combustion engine supplies secondary air into an exhaust pipe without cooling nor inactivating an electrically heated catalyst (EHC) that is active. The exhaust purifier includes the EHC 3 disposed in the exhaust pipe 2, a main catalyst 4 disposed in the exhaust pipe 2 downstream from the EHC 3, and a unit for supplying secondary air into the exhaust pipe 2. The secondary air supply unit has a main path 10 for supplying secondary air into a space defined in the exhaust pipe 2 between the EHC 3 and the main catalyst 4 when it is determined that the main catalyst 4 is active. The secondary air supply unit may additionally have a second path 9 for supplying secondary air into the exhaust pipe 2 on the upstream side of the EHC 3 when it is determined that the EHC 3 is active, so that the secondary air may pass through the EHC 3 and reach the main catalyst 4.

REFERENCES:
patent: 4125997 (1978-11-01), Abthoff et al.
patent: 5456063 (1995-10-01), Yoshizaki et al.

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