Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1996-07-05
1999-08-17
Denion, Thomas E.
Power plants
Internal combustion engine with treatment or handling of...
Methods
60288, 60297, 60307, F01N 300
Patent
active
059376376
ABSTRACT:
A system for purifying an exhaust gas for use in an automobile is disclosed which does not externally discharge unburnt hydrocarbons until a catalyst becomes active. An adsorbent is provided upstream of the catalyst. A heat exchanger is disposed between an upstream portion of the adsorbent and a portion between the adsorbent and the catalyst for controlling the elevation of the temperature of the adsorbent and for promoting the elevation of the temperature of the catalyst. The unburnt hydrocarbons are absorbed by the adsorbent 4 in the initial period of time from starting of an engine until the catalyst 8 becomes active. Temperature control is made in such a manner that the unburnt hydrocarbons which are adsorbed by the adsorbent 4 begins to be desorbed therefrom substantially simultaneously with the time when the catalyst 8 begins to function. A large quantity of unburnt hydrocarbons which are emitted from an engine immediately after the starting of the engine are prevented from being externally discharged without being treated.
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Atago Takeshi
Fujishita Masakatsu
Honji Akio
Kuroda Osamu
Ogawa Toshio
Denion Thomas E.
Hitachi , Ltd.
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