Exhaust gas cleaning apparatus of an internal combustion engine

Details Exhaust gas cleaning apparatus of an internal combustion engine Exhaust gas cleaning apparatus of an internal combustion engine

1977-09-22

1979-04-24

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60290, F01N 315

Patent

active

041505417

ABSTRACT:
Disclosed is an exhaust gas cleaning apparatus of an internal combustion engine, provided with a three-way catalytic converter and a vacuum-operated flow control valve. The flow control valve has a diaphragm for controlling the amount of secondary air directed into an exhaust manifold of the engine for the effective operation of the three-way catalytic converter. In order to move the diaphragm to increase or decrease the amount of secondary air, a vacuum chamber is formed on one side of the diaphragm. This vacuum chamber is opened to a vacuum port formed in the intake system of the engine for transmitting the vacuum signal from the port to the vacuum chamber. Further, in order to maintain a constant rate of movement of the diaphragm irrespective of the vacuum level at the port, means are provided for transmitting a vacuum signal from the port to another vacuum chamber formed on the other side of the diaphragm.

REFERENCES:
patent: 3738109 (1973-06-01), Tatsutomi
patent: 3962867 (1976-06-01), Ikeura

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