Exhaust gas purification system and exhaust gas purification met

Details Exhaust gas purification system and exhaust gas purification met Exhaust gas purification system and exhaust gas purification met

1994-08-11

1997-07-15

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60284, 60297, 60300, 60302, F01N 320

Patent

active

056472030

ABSTRACT:
An exhaust gas purification system for an internal combustion engine is herein disclosed which comprises an exhaust system having an adsorption flow path provided with an adsorbent capable of adsorbing harmful components such as hydrocarbons in an exhaust gas, and a catalyst flow path provided with at least one catalyst for decreasing the harmful components in the exhaust gas, the exhaust gas purification system being characterized in that an outlet of the adsorption flow path is joined to the catalyst flow path at a predetermined position on the upstream side of the catalyst to form a joint portion; the exhast gas produced at least at the time of the operation start of the internal combustion engine is divided so as to flow through the adsorption flow path and the catalyst flow path in a predetermined ratio, so that part of harmful components such as the hydrocarbons are adsorbed by the adsorbent in the adsorption flow path; and when the adsorbed harmful components begin to desorb from the adsorbent with the temperature rise of the adsorbent, the catalyst on the downstream of the joint portion is activated.

REFERENCES:
patent: 5184462 (1993-02-01), Schatz
patent: 5271906 (1993-12-01), Yuuki
patent: 5379586 (1995-01-01), Honji
patent: 5388405 (1995-02-01), Fujishita
Heimrich et al., :"Cold-Start Hydrocarbon Collection to Advanced Exhaust Emission Control", SAE Paper No. 920847.

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