Apparatus for introducing secondary air into an exhaust system o

Details Apparatus for introducing secondary air into an exhaust system o Apparatus for introducing secondary air into an exhaust system o

1976-12-02

1978-09-05

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60289, F01N 310

Patent

active

041109791

ABSTRACT:
An apparatus for introducing secondary air into an exhaust system of an internal combustion engine, provided with a three-way catalytic converter in the exhaust system. The apparatus includes a first air flow control valve adapted for controlling the amount of air introduced into the exhaust system in accordance with the atmosphere of the exhaust gas so as to cause it to be kept near stoichiometric atmosphere, and a second air flow control valve adapted for preliminarily controlling the amount of secondary air introduced into said first air flow control valve in accordance with the amount of engine fluid passing through the intake system or exhaust system. The atmosphere control operation by the first air flow control valve is effectively promoted by the second air flow control valve, so that atmosphere of the exhaust gas can be strictly and precisely controlled to said stoichiometric atmosphere for proper operation of the three-way catalytic converter.

REFERENCES:
patent: 3086353 (1963-04-01), Ridgway
patent: 3921396 (1975-11-01), Nohira
patent: 3931710 (1976-01-01), Hartel
patent: 3945205 (1976-03-01), Atago
patent: 3962867 (1976-06-01), Ikeura

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