Dual-catalyst exhaust gas purifying apparatus for multi-cylinder

Details Dual-catalyst exhaust gas purifying apparatus for multi-cylinder Dual-catalyst exhaust gas purifying apparatus for multi-cylinder

1978-07-06

1980-08-05

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

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

60293, 60289, 60301, F01N 315

Patent

active

042155410

ABSTRACT:
For use in an automobile multi-cylinder engine having exhaust ports leading from engine cylinders and through which exhaust gases are emitted, an exhaust gas purifying apparatus comprising a reducing catalyst unit and an oxidizing catalyst unit disposed in a main exhaust manifold communicated through exhaust ducts to a first group of the exhaust ports and, on the other hand, to the atmosphere, an auxiliary exhaust manifold communicated to a second group of the exhaust port and, on the other hand, to a portion of the main exhaust manifold at a position intermediately between the reducing and oxidizing catalyst units, a secondary air supply passage extending from a source of secondary air to the auxiliary exhaust manifold, and an additional secondary air supply passage extending from the secondary air source to any one of the collecting ducts communicated to the exhaust ports of the first group. The apparatus further comprises means for warming the exhaust gases emitted from the exhaust port of the second group.

REFERENCES:
patent: 3767764 (1973-10-01), Dolbear
patent: 3791144 (1974-02-01), Lang
patent: 3984975 (1976-10-01), Price
patent: 4077209 (1978-03-01), Suzuki

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