Arrangement for switching a carburetor in internal combustion engines

摘要

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.