Method and device for controlling a carburetor

Details Method and device for controlling a carburetor Method and device for controlling a carburetor

1993-02-19

1994-09-13

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Auxiliary control of carburetor fuel metering

123491, F02M 700

Patent

active

053459121

ABSTRACT:
In a method and device for controlling a carburetor (1) of an i. c. engine, the A/F ratio thereof is automatically adjusted to a preferred level during varying operating conditions. An adjusting means (5) is continuously actuated by a first control unit (4) of a first control circuit (3) to provide a A/F ratio having a modified dependency on the speed of rotation. An adjusting means (9) is periodically actuated for a short period by a second control unit (7) of a second control circuit (6), said second control unit receiving speed information (8) from the engine (2), to provide a short-term change of the mixture ratio, and the change of speed of rotation caused thereby is measured. With regard to the obtained result and stored information the second control unit (7) performs an adjustment of the mixture ratio by a predetermined step towards leaner or richer mixture by actuating an adjusting means (5). This procedure is repeated in the second control circuit (6) until the change of speed of rotation indicates that the mixture ratio is at a preferred level, and this adjustment is maintained for a period of time.

REFERENCES:
patent: 4436073 (1984-03-01), Miyagi
patent: 4524742 (1985-06-01), Bonfigliogli et al.
patent: 4685434 (1987-08-01), Ando et al.
patent: 4787356 (1988-11-01), Rosgen et al.

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