Exhaust purifier and manufacturing method of same
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United States of America Patent
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Sep 10, 2002
Grant Date -
N/A
app pub date -
Apr 8, 1999
filing date -
Apr 30, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Plural hydrocarbon HC adsorbing units (A1-A3) and plural three-way catalysts (B1-B3) are accommodated in a shell (2). The HC adsorbing units (A1-A3) and three-way catalysts (B1-B3) are disposed alternately in series, and one of the HC adsorbing units (A1-A3) is disposed in the position nearest to an inlet (14) of the shell (2). The HC contained in exhaust gas when the engine is started cold is first adsorbed by the HC adsorbing units (A1-A3), and the HC desorbed from the HC adsorbing units (A1-A3) with temperature rise is oxidized by the adjacent three-way catalysts (B1-B3) situated downstream. The heat capacities of the HC adsorbing units (A1-A3) and the three-way catalysts (B1-B3) are set so that the timing at which HC starts to be desorbed from the HC adsorbing units (A1-A3) is later than the timing at which HC starts to be oxidized by the three-way catalysts (B1-B3) situated downstream. In this way, HC which are discharged from the engine during a cold start are efficiently purified.
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