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

1977-08-11

1979-02-27

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60290, F01N 310

Patent

active

041412141

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 in the form of an oxygen concentration-cell which detects an air-fuel ratio higher than a stoichiometric air-fuel ratio at which the converter effectively operates, and a secondary air injection system adapted for increasing or decreasing the amount of secondary air introduced into the exhaust pipe of the engine in accordance with electrical signals transmitted from the air-fuel ratio sensor. Means are provided for controlling the speed of introduction of secondary air so that the speed of decreasing the amount of secondary air is higher than the speed of increasing the amount of secondary air. Therefore, the air-fuel ratio of the exhaust gas is effectively controlled by signals transmitted from the sensor to approximate the stoichiometric ratio.

REFERENCES:
patent: 3919843 (1975-11-01), Arnaud
patent: 3931710 (1976-01-01), Hartel
patent: 3962867 (1976-06-01), Ikeura

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