Exhaust gas cleaning apparatus for an internal combustion engine

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

1977-10-25

1979-07-31

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60290, F01N 315

Patent

active

041626125

ABSTRACT:
Disclosed is an exhaust gas cleaning apparatus of an internal combustion engine, provided with a three-way catalytic converter, an air-fuel ratio sensor and a secondary air injection system. The secondary air injection system has a diaphragm-operated flow control valve for increasing or decreasing the amount of secondary air introduced into the exhaust manifold of the engine in accordance with electrical signals transmitted from the air-fuel ratio sensor. Means are provided for rapidly increasing or decreasing the air-fuel ratio to a stoichiometric value at the moment when the amount of secondary air passed through the flow control valve is increased or decreased. Therefore, the air-fuel ratio is maintained quite near the stoichiometric value at which the three-way catalytic converter can effectively operate to clean the three major toxic components in the exhaust gas.

REFERENCES:
patent: 3921396 (1975-11-01), Nohira
patent: 3962867 (1976-06-01), Ikeura
patent: 4112678 (1978-09-01), Miyagi

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