Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1977-01-05
1978-07-25
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60289, 60290, F01N 310
Patent
active
041021266
ABSTRACT:
Disclosed is 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 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 a stoichiometric atmosphere, and a pressure control valve adapted for keeping a predetermined constant pressure difference of the secondary air between a position upstream from the flow control valve and a position downstream from the flow control valve. The atmosphere control operation by the flow control valve is effectively promoted by the pressure 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: 3768259 (1973-10-01), Carnahan
patent: 3945205 (1976-03-01), Atago
patent: 4037406 (1977-07-01), Hartel
Hart Douglas
Toyota Jidosha Kogyo Kabushiki Kaisha
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