Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1977-11-09
1979-05-29
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60290, F01N 315
Patent
active
041563450
ABSTRACT:
Disclosed is a secondary air feed control device comprising a movable valve and a movable valve seat having a first and a second valve port. The first valve port is connected to the secondary air inlet disposed in the exhaust pipe, while the second valve port is connected to the atmosphere. The movable valve is arranged between the first and second valve ports so as to co-operate with the first and second valve ports. An oxygen concentration detector, providing a detecting signal indicating that the total air-fuel ratio is smaller than the stoichiometric air-fuel ratio, is disposed in the exhaust pipe. The opening area of the first valve port is controlled so as to be increased in accordance with an increase in the level of the load of the engine and in response to the detecting signal when the total air-fuel ratio becomes smaller than the stoichiometric air-fuel ratio.
REFERENCES:
patent: 3931710 (1976-01-01), Hartel
patent: 3962867 (1976-06-01), Ikeura
Hart Douglas
Toyota Jidosha Kogyo Kabushiki Kaisha
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