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AssigneeHusqvarna AB
InventorsMikael Larsson, Magnus Ottosson, Bo Carlsson
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The invention concerns a method for controlling the fuel supply to an internal combustion engine at start-up, the engine having a fuel supply system. The invention also concerns a carburetor having a fuel supply system including a main fuel path connecting a diaphragm controlled regulating chamber to a main outlet in the region of the venturi section, the main fuel path including an actively controlled fuel valve, and an idling fuel path branching off from the main fuel path downstream of the valve and ending in at least one idling outlet in the region of a throttle valve, the fuel supply system further including a start fuel line starting upstream or downstream of the fuel valve and ending in at least one start fuel outlet to the intake channel.
A method of controlling the fuel supply to an internal combustion engine at start-up, the engine having a fuel supply system which can be set in at least two start modes, a lean mode, and a rich mode, the rich mode providing extra fuel during start-up of the engine, the method including:
A carburetor for an engine, said carburetor including:
A carburetor according to claim 17, wherein the choke valve is a butterfly valve having a closing mechanism in form of a disk, and wherein the air conduit, which permits a leakage of air past the choke valve, is either an enlarged bore through the disk or an additional bore through the disk to increase the air flow through the choke valve when the valve is closed.
A carburetor according to 13, wherein said at least one start fuel outlet is located upstream of the venturi section, preferably in the region of the choke section and downstream of the choke valve, for supplying fuel to the intake channel.
Dependencies are inferred from the claim text.