Exhaust gas cleaning system for internal combustion engine

Details Exhaust gas cleaning system for internal combustion engine Exhaust gas cleaning system for internal combustion engine

1982-08-24

1984-05-29

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

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

60293, F02B 7515, F01N 322

Patent

active

044506848

ABSTRACT:
An exhaust gas cleaning system for an internal combustion engine having an exhaust system leading to an exhaust port of an engine body. The exhaust gas cleaning system comprises a TWC catalyst disposed in the exhaust system for simultaneously cleaning HC, CO and NO.sub.X in exhaust gas flowing through the exhaust system. A secondary-air supply passage is connected to the exhaust system on the upstream side of the TWC catalyst and coupled to the atmosphere. A check valve is disposed in the secondary-air supply passage, wherein the check valve is opened by the exhaust gas pulsation generated in the exhaust system and a secondary air control valve is positioned in the secondary-air supply passage on the upstream side of the check valve, wherein the secondary-air control valve increases the flow rate of the secondary air supplied to the exhaust system in the low-speed revolution range of the engine and decreases the flow rate of the secondary air supplied to the exhaust system in the accelerating and high-speed revolution ranges of the engine such that the atmosphere of the TWC catalyst becomes oxidative in the low-speed revolution range of the engine while the catalyst atmosphere becomes close to that of a stoichiometric ratio in the accelerating and high-speed revolution ranges.

REFERENCES:
patent: 3751915 (1973-08-01), Ranft
patent: 3974651 (1976-08-01), Nakajima
patent: 4014169 (1977-03-01), Umino
patent: 4075834 (1978-02-01), Saito
patent: 4148189 (1979-04-01), Siki
patent: 4215542 (1980-08-01), Kobayashi

Affiliated with

Also associated with

Rating

Exhaust gas cleaning system for internal combustion 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 cleaning system for internal combustion engine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exhaust gas cleaning system for internal combustion engine will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1391521