Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1994-05-10
1995-10-24
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
123700, 123701, F02D 4114
Patent
active
054601495
ABSTRACT:
Flow passage lines are used to connect the float chamber of a conventional carburetor both to the engine's intake and exhaust manifold. The gas flow produced by the exhaust manifold 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 rates in the positive pressure line and in the negative pressure line are regulated by means of two control solenoid valves. The pressure in the float chamber reflects the net impact of the positive and negative pressures transmitted trough 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. A third solenoid valve in series in the negative pressure line and an accumulator chamber are also used to provide fine control to the vacuum from the intake manifold. Finally, a bypass air bleed may be used to increase the air/fuel ratio at idle.
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Petty Jon A.
Tofel Richard M.
Argenbright Tony M.
Durando Antonio R.
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