Apparatus for controlling secondary air

Details Apparatus for controlling secondary air Apparatus for controlling secondary air

1977-10-25

1979-05-29

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60301, 60306, F01N 310

Patent

active

041563468

ABSTRACT:
Disclosed is an apparatus for controlling secondary air for purifying exhaust gas discharged from an internal combustion engine. The apparatus comprises a pair of catalytic converters disposed in series within an exhaust system, a secondary air switching device communicated with two positions each of which is located respectively upstream of each of the catalytic converters, an actuating device for selectively communicating the secondary air switching device with each of the above-mentioned two positions, and a detecting device for detecting the temperature of the first catalytic converter located upstream of the second converter.
If the detecting device detects a condition wherein the temperature of the first catalytic converter is lower than a predetermined level, secondary air is supplied to the position upstream of the first catalytic converter. On the other hand, if the detecting device has detected a condition wherein the temperature of the first catalytic converter is above the predetermined level, secondary air is alternately supplied to each of the above-mentioned two positions. By utilizing the apparatus of the present invention, the converting efficiency of the first catalytic converter can be maintained at a high level.

REFERENCES:
patent: 3757521 (1973-09-01), Tourtellotte
patent: 3869858 (1975-03-01), Goto
patent: 3888080 (1975-06-01), Nohira
patent: 3906723 (1975-09-01), Matumoto
patent: 3921396 (1975-11-01), Nohira
patent: 3943709 (1976-03-01), Holt
patent: 4070830 (1978-01-01), Beiswenger

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