Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1993-06-28
1994-05-10
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
123701, F02D 4114
Patent
active
053098897
ABSTRACT:
Flow passage lines are used to connect the float chamber of a conventional carburetor both to the engine's intake manifold and to a tube positioned downstream of the radiator fan. The air flow produced by the fan provides a continuous source of positive pressure to the float chamber, while the engine's suction and the corresponding vacuum in the intake manifold provide a continuous source of negative pressure. The flow in the positive pressure line and in the negative pressure line is regulated by means of two control solenoid valve. The two valves operate cyclically and off-phase, so that when the pressure valve is closed the vacuum valve is open, and vice versa. The pressure in the float chamber reflects the net impact of the positive and negative pressures transmitted through the lines. The solenoid valves are responsive to a control signal generated by an electronic circuit as a function of deviations in the oxygen content of the exhaust gases from a desired set point. The ambient pressure in the float chamber is either increased or decreased as the oxygen sensor indicates that either a lean or a rich fuel mixture is being combusted in the engine.
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Petty Jon A.
Tofel Richard M.
Argenbright Tony M.
Durando Antonio R.
Weiss Harry M.
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