Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1978-04-04
1980-04-29
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60290, F01N 310
Patent
active
041999398
ABSTRACT:
A secondary air supply system for the exhaust system of an internal combustion engine having a catalytic converter with a three-way catalyst, having an air control valve which selectively supplies a part of compressed air to the exhaust system while relieving the rest of the air to the atmosphere, wherein the air control valve has a valve element balanced by oppositely acting springs to a neutral position where it supplies a predetermined amount of secondary air necessary to provide stoichiometric exhaust gases at a standard flow of exhaust gases and is shifted to opposite sides of the neutral position in accordance with oscillation of feedback control of the air/fuel ratio of exhaust gases, the neutral position being shifted in accordance with changes of the flow of exhaust gases from the standard flow by diaphragm means against the balancing spring force in order to make the neutral position follow the flow of exhaust gases.
REFERENCES:
patent: 3931710 (1976-01-01), Hartel
patent: 3962867 (1976-06-01), Ikeura
patent: 4087964 (1978-05-01), Miyagi
patent: 4100735 (1978-07-01), Miyagi
Hart Douglas
Toyota Jidosha Kogyo Kabushiki Kaisha
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