Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1978-04-04
1981-05-26
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60289, 251 31, 251 61, 251 614, F01N 310, F16K 3142
Patent
active
042690285
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.
REFERENCES:
patent: 3255772 (1966-06-01), Williams
patent: 4087964 (1978-05-01), Miyagi
patent: 4100735 (1978-07-01), Miyagi
patent: 4112678 (1978-09-01), Miyagi
patent: 4141214 (1979-02-01), Mitsuda
patent: 4147030 (1979-04-01), Katahira
patent: 4159626 (1979-07-01), Shibata
patent: 4162612 (1979-07-01), Mitsuda
Hart Douglas
Toyota Jidosha Kogyo Kabushiki Kaisha
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