System for introducing secondary air into an internal combustion

Details System for introducing secondary air into an internal combustion System for introducing secondary air into an internal combustion

1976-10-18

1978-05-09

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60290, 60293, F01N 310

Patent

active

040879640

ABSTRACT:
A system for introducing secondary air into gas exhausted from an internal combustion engine of the carburetor type, provided with a three-way catalytic converter in the exhaust system of the engine. The system includes a flow control valve having a diaphragm operated valve member for controlling the amount of secondary air in accordance with electric signals from a .lambda.-sensor arranged in an exhaust system of the engine so that excess air ratio .lambda. of the exhaust gas, which is introduced into the three-way catalytic converter, is controlled near 1.0. Therefore, effective cleaning operation of the three-way catalytic converter is expected.

REFERENCES:
patent: 3911674 (1975-10-01), Goto
patent: 3962867 (1976-06-01), Ikeura
patent: 4014169 (1977-03-01), Umino
patent: 4037406 (1977-07-01), Hartel

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