Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1977-11-08
1979-11-13
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60290, F01N 310
Patent
active
041738640
ABSTRACT:
Disclosed is a secondary air feed control device in an internal combustion engine having in its exhaust system a three way catalytic converter and an oxygen concentration detector. This detector provides a signal indicating that the total air-fuel ratio is smaller than the stoichiometric air-fuel ratio. The secondary air feed control device comprises a valve port through which the secondary air passes, and an air valve co-operating with the valve port. The air valve is actuated by a pair of diaphragm apparatus. One of the diaphragm apparatus is selectively connected to either the intake manifold or the atmosphere via a restricted opening in response to said signal. The other diaphragm apparatus is selectively connected to either a vacuum source of a constant level or the atmosphere via a restricted opening in response to said signal. The opening speed of the air valve is reduced and the closing speed of the air valve is increased in accordance with the reduction in the level of the load of the engine.
REFERENCES:
patent: 3430437 (1969-03-01), Saussele
patent: 4037407 (1977-07-01), Hartel
patent: 4087964 (1978-05-01), Miyagi
patent: 4100735 (1978-07-01), Miyagi
Hart Douglas
Toyota Jidosha Kogyo Kabushiki Kaisha
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