Method for controlling the air-fuel ratio in a carburetor of an

Details Method for controlling the air-fuel ratio in a carburetor of an Method for controlling the air-fuel ratio in a carburetor of an

1982-04-09

1984-08-07

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Auxiliary control of carburetor fuel metering

F02M 720

Patent

active

044637241

ABSTRACT:
A method for controlling the air-fuel ratio in a carburetor which prevents fuel from flowing into an air bleed passage at nearly fully closed position of the tapered needle valve fitted with the air bleed passage by controlling the step motor connected to the needle valve so as to maintain the minimum amount of bleed air at a constant level. In another aspect, at nearly fully closed position of the needle valve, this invention is effective to prevent fuel from flowing into the air bleed passage by continously driving the step motor in a direction of its fully closed position to axially vibrate the needle valve so that the minimum amount of bleed air may be maintained at a constant level. In a further aspect, at nearly fully closed position of the needle valve, this invention is effective to determine the relation between the amount of stroke of the needle valve and the amount of bleed air to flat characteristics by continuously driving the step motor in a direction of the fully closed position of the needle valve so that the minimum amount of bleed air may be maintained at such a level that the fuel is prevented from flowing into the air bleed passage.

REFERENCES:
patent: 4036186 (1977-07-01), Hattori et al.
patent: 4077207 (1978-03-01), Hattori et al.
patent: 4085716 (1978-04-01), Minami
patent: 4114372 (1978-09-01), Ikeuna

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