Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1993-02-10
1994-04-05
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
F02D 4114
Patent
active
052995518
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 positive pressure line is constantly open to the float chamber and is also connected to the negative pressure line by means of a control solenoid valve. When the valve is closed, the pressure in the float chamber reflects the full impact of the positive pressure differential generated by the radiator fan. As the valve is progressively opened, the vacuum of the intake manifold gradually reduces the positive pressure differential transmitted to the chamber; at some point, the effect of the vacuum source overcomes the effect of the positive pressure source and a net negative pressure differential is provided to the float chamber. The solenoid valve is 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. Accordingly, 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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