Exhaust gas purifying device for engine

Details Exhaust gas purifying device for engine Exhaust gas purifying device for engine

1997-10-28

1999-12-07

Ryznic, John E.

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60300, 60301, F01N 320, B01D 5336

Patent

active

059963387

ABSTRACT:
An exhaust gas purifying device for an engine comprises an exhaust gas purifying catalyst with an electric heater arranged in the exhaust passage capable of temporarily adsorbing NO.sub.X in the inflowing exhaust gas therein. A NO.sub.X adsorbing capacity of the exhaust gas purifying catalyst becomes larger when a temperature of the exhaust gas purifying catalyst becomes higher. The heater is turned on and is turned off alternately and repeatedly to thereby increase and reduce the catalyst temperature. NO.sub.X in the inflowing exhaust gas is adsorbed in the exhaust gas purifying catalyst when the catalyst temperature falls, and the adsorbed NO.sub.X is desorbed from the exhaust gas purifying catalyst and reduced when the catalyst temperature increases. The catalyst temperature is controlled to increase to a first upper threshold temperature, at which the NO.sub.X adsorbing capacity of the exhaust gas purifying catalyst is substantially zero, and is controlled to fall to a first lower threshold temperature, at which the NO.sub.X adsorbing capacity of the exhaust gas purifying catalyst is substantially a maximum.

REFERENCES:
patent: 5191763 (1993-03-01), Yuuki
patent: 5195318 (1993-03-01), Shinzawa et al.
patent: 5216880 (1993-06-01), Aoki et al.
patent: 5271906 (1993-12-01), Yuuki et al.
patent: 5357749 (1994-10-01), Ohsuga et al.
patent: 5634331 (1997-06-01), Aoki et al.
patent: 5711149 (1998-01-01), Araki
patent: 5785138 (1998-07-01), Yoshida
patent: 5802845 (1998-09-01), Abe et al.

Affiliated with

Also associated with

Rating

Exhaust gas purifying device for engine does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Exhaust gas purifying device for engine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exhaust gas purifying device for engine will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-810905