Engine exhaust purifier

Details Engine exhaust purifier Engine exhaust purifier

1997-03-17

1998-09-08

Tran, Hien

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Waste gas purifier

422171, 422177, 422180, 422199, 422211, 422222, 422109, 60284, 60297, 60300, F01N 310

Patent

active

058041486

ABSTRACT:
An HC adsorbent which adsorbs hydrocarbons in a predetermined low temperature region and discharges hydrocarbons in a temperature region higher than the lower temperature region is provided in an engine exhaust passage. A catalyst which oxidizes hydrocarbons in a predetermined high temperature region is provided downstream of the HC adsorbent. A heater for heating exhaust is provided upstream of the HC adsorbent. A control unit activates the heater when the exhaust temperature has risen to near the upper limit of the lower temperature region. Activation of the catalyst is thereby promoted, and the time until the catalyst starts oxidizing hydrocarbons discharged by the HC adsorbent is shortened.

REFERENCES:
patent: 5296198 (1994-03-01), Abe et al.
patent: 5315824 (1994-05-01), Takeshima
patent: 5422082 (1995-06-01), Yoshizaki et al.
patent: 5529043 (1996-06-01), Nagaishi et al.
patent: 5634331 (1997-06-01), Aoki et al.

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