Fuel supply system for gas-fueled engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsNoriuiki Kurihara, Yoshikatsu Iida
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Abstract
Two embodiments of air/fuel ratio adjusting systems for gaseous-fueled internal combustion engines. In each embodiment, a pressure regulator supplies regulated fuel in gaseous form from a source in which it is stored in a liquid form to a charge former that has a fuel control device such as a needle valve. The air/fuel ratio is maintained constant by mixing atmospheric air with the fuel before the charge former fuel control device under the control of an oxygen sensor in the exhaust system. In one embodiment, an enrichment system is also incorporated for supplying enrichment fuel under acceleration or cold starting conditions.
Claims23
A charge forming system for an internal combustion engine comprising a carburetor for mixing fuel with atmospheric air for delivery to a combustion chamber of said engine, said carburetor having a main fuel discharge circuit including a main fuel control means for controlling the amount of fuel mixed with atmospheric air in said carburetor, a source of gaseous fuel stored under pressure as a liquid, pressure regulator means communicating with said source for reducing the pressure of said fuel in a gaseous fuel from said source for delivery to said carburetor fuel control means, means for selectively mixing atmospheric air with said fuel between said regulator and said carburetor fuel control means and an additional fuel circuit for said carburetor having means for adjusting the fuel supply to said additional fuel supply circuit, said means for selectively mixing atmospheric air delivering atmospheric air also to said additional fuel circuit upstream of said means for adjusting the fuel flow through said additional circuit.
A charge forming system for an internal combustion engine comprising a carburetor for mixing fuel with atmospheric air for delivery to a combustion chamber of said engine, said carburetor having fuel control means for controlling the amount of fuel mixed with atmospheric air in said carburetor comprising a needle valve and a throttle valve, a source of gaseous fuel stored under pressure as a liquid, pressure regulator means communicating with said source for reducing the pressure of said fuel in a gaseous fuel from said source for delivery to said carburetor fuel control means, and means for selectively mixing atmospheric air with said fuel between said regulator and said carburetor fuel control means, said carburetor having a main fuel circuit and another fuel circuit, said carburetor fuel control means being provided in said other fuel circuit of the carburetor.
Dependencies are inferred from the claim text.