Arrangement for switching a carburetor in internal combustion en

Details Arrangement for switching a carburetor in internal combustion en Arrangement for switching a carburetor in internal combustion en

1980-06-13

1983-02-08

Myhre, Charles J.

Internal-combustion engines

Charge forming device

Combined liquid and gaseous fuel

123575, 261 16, 261 44C, F02M 1308

Patent

active

043722768

ABSTRACT:
An arrangement for switching a carburetor in an internal combustion engine in a vehicle adapted for alternative operation on liquid or gaseous fuel. The carburetor is of the type where the pressure upstream of a throttle butterfly determines the engine air and fuel supply by the actuation of a piston provided with a metering needle. When using liquid fuel, the piston executes upward and downward movements, a passage leading through the carburetor thereby being constricted to a varying degree, and similarly the needle is caused to be thrust to a varying degree into a nozzle for metering liquid fuel to the engine induction air. This signifies too rapid wear of the metering needle in alternating operation on liquid and gaseous fuel. To prevent such wear, the invention provides an arrangement having at least one solenoid incorporated in an electrical circuit for at least indirectly actuating the piston to assume and retain a position minimally constricting the passage when gas is supplied to the engine induction system.

REFERENCES:
patent: 2381304 (1945-08-01), Merrill
patent: 3855974 (1974-12-01), Mayer
patent: 3974813 (1976-08-01), Knapp et al.

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