Spark ignition internal combustion engines

Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means

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Details

123124B, 60276, 261121B, 261DIG63, 261DIG74, 261DIG19, F02H 700

Patent

active

041111699

ABSTRACT:
An oxygen sensor is fitted to the exhaust pipe of a spark ignition internal combustion engine so that it projects into the exhaust gas stream. Its output is connected to a comparator circuit which has its output connected to the actuator of a variable airflow controller which controls airflow through an air supply passage which is connected to the fuel supply jet of an air valve carburetor between the fuel metering orifice and the fuel discharge nozzle of that carburetor. The comparator circuit emits an output when the oxygen sensor detects that the ratio of the air/fuel mixture fed to the engine by the carburetor is either richer or leaner than the stoichiometric ratio. The output from the comparator circuit drives the variable air flow controller in the appropriate direction to tend to return the ratio of the air/fuel mixture fed by the carburetor to the engine towards stoichiometry. An auxiliary air supply passage may be connected to the induction passage downstream of the throttle valve. A variable restrictor in the auxiliary air supply passage is controlled by the output from the oxygen sensor so that the supply of air through the auxiliary air supply passage to the induction passage is varied in same way to change the air/fuel ratio and return it towards stoichiometry.

REFERENCES:
patent: 3738341 (1973-06-01), Loos
patent: 3745768 (1973-07-01), Zechnall et al.
patent: 3900014 (1975-08-01), Bundesen et al.
patent: 3963009 (1976-06-01), Mennesson
patent: 3974813 (1976-08-01), Knapp et al.

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