Exhaust gas cleaning system for internal combustion engines

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

1982-08-19

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 7510, F01N 322

Patent

active

044506830

ABSTRACT:
An exhaust gas cleaning system for an internal combustion engine is provided which has an exhaust system including a TWC catalyst. The exhaust gas cleaning system comprises a secondary air supply passage coupled to the exhaust system on the upstream side of the ternary catalyst for supplying secondary air to the exhaust system. A secondary air control valve is positioned in the secondary air supply passage for regulating the flow of secondary air therethrough. The secondary air control valve comprises a unitary valve casing, a valve passage in the valve casing coupled to the secondary air supply passage, and first and second control valves for separately opening and closing the valve passages. The first control valve is closed when the engine is decelerating and the second control valve is closed when the engine is accelerating or operating at high speed, thereby maintaining the TWC catalyst as a reducing atmosphere.

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

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