Secondary air supply system for the exhaust system of an interna

Details Secondary air supply system for the exhaust system of an interna Secondary air supply system for the exhaust system of an interna

1978-05-02

1980-07-08

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60289, 60290, F01N 310

Patent

active

042110742

ABSTRACT:
A secondary air supply system for the exhaust system of an internal combustion engine having a catalytic converter with a three-way catalyst. The system has 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. The air control valve has a first valve element which controls a passage between an inlet port and an outlet port and a second valve element which controls a passage between the inlet port and a relief port, the first valve element being controlled by a first diaphragm means in an ON/OFF manner by changing-over of supply of different actuating fluid pressures depending upon monitoring of residual oxygen in exhaust gases, while the second diaphragm element is operated by a second diaphragm means which responds to the duty ratio of changing-over of the different actuating fluid pressures so as to compensate for the change of mean flow of secondary air.

REFERENCES:
patent: 4102126 (1978-07-01), Miyagi
patent: 4137713 (1979-02-01), Takeda
patent: 4141214 (1979-02-01), Mitsuda
patent: 4159626 (1979-07-01), Shibata

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