Exhaust gas purifying system for internal combustion engines

Details Exhaust gas purifying system for internal combustion engines Exhaust gas purifying system for internal combustion engines

1981-06-08

1982-12-14

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60289, 123589, 251129, F01N 322

Patent

active

043632106

ABSTRACT:
An exhaust gas purifying system for internal combustion engines includes a three-way catalyst disposed in the exhaust system of the engine, and secondary air is supplied to the exhaust system through an air control valve under the control of an air-fuel ratio control circuit. The air-fuel ratio control circuit produces a control signal which increases or decreases stepwisely at every reception of a clock signal depending on whether the air-fuel ratio in the exhaust system is above or below a stoichiometric air-fuel ratio. The air control valve is of the proportional electromagnetic type and controls the secondary air passing therethrough in proportion to the control signal.

REFERENCES:
patent: 2562524 (1951-07-01), Burnum
patent: 3410293 (1968-11-01), Ernyei
patent: 3588039 (1971-06-01), Chelminski
patent: 3605775 (1971-09-01), Zaander
patent: 3688495 (1972-09-01), Fehler
patent: 3759232 (1973-09-01), Wahl
patent: 3875907 (1975-04-01), Wessel
patent: 3895611 (1975-07-01), Endo
patent: 4102126 (1978-07-01), Miyagi
patent: 4129105 (1978-12-01), Ito
patent: 4150643 (1979-04-01), Sasayama
patent: 4201169 (1980-05-01), Michassouridis

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