Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1976-11-01
1978-09-12
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60289, F01N 310
Patent
active
041126785
ABSTRACT:
A system for introducing secondary air into an exhaust system of an internal combustion engine of the carburetor type provided with a three-way catalytic converter in the exhaust system is disclosed. The system includes a flow control valve which has a valve member operated by a vacuum signal in the engine intake system for controlling the amount of secondary air flowing into the engine in accordance with electric signals sent from a .lambda.-sensor which is arranged in an exhaust system of the engine so that the excess air ratio .lambda. of the exhaust gas introduced into the three-way catalytic converter is controlled near 1.0, which is a suitable ratio for the operation of the three-way catalytic converter. The system further includes means for operating the valve member quickly so that the excess air ratio .lambda. is rapidly controlled near 1.0; therefore, an effective cleaning operation of the three-way catalytic converter is expected.
REFERENCES:
patent: 3911674 (1975-10-01), Goto
patent: 3931710 (1976-01-01), Hartel
patent: 3962867 (1976-06-01), Ikeura
patent: 4014169 (1977-03-01), Umino
Hart Douglas
Toyota Jidosha Kogyo Kabushiki Kaisha
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