Method, system and apparatus for metering fuel to an internal combustion engine via a carburetor having a mixture conduit with a venturi therein. A main fuel nozzle supplies fuel to the venturi of the carburetor in response to the static pressure drop induced across an associated main fuel flow controlling restriction by the engine intake induced air flow through the carburetor mixture conduit. A pitot tube is disposed in the venturi with an opening facing upstream in a zone of maximum air flow through the carburetor venturi. A vent passageway system connects the pitot tube to a single closed air chamber cooperable with either a diaphragm or a float to regulate operation of an inlet valve controlling flow of fuel to a main fuel controlling restriction. The adverse effect of engine intake induced tuning pressure wave forms in the mixture conduit of the carburetor transitting the venturi is eliminated, reduced or modulated by the dynamic pressure exerted by said tuning waves at the pitot tube and transmitted by the vent passageway to said chamber and to said main fuel restriction.

Fuel metering method and apparatus

The invention is innovatingly disclosed to install a high shift transmission pulley train (202) attaching with a clutching device (103) between the input shaft (101)and the output shaft (103) of a continuously-variable transmission device (100) in the same revolving directions, wherein when rotational speed of the output shaft (103) reaches or exceeds setting rotational speed, the clutching device (222) is closed to connect the driven pulley of the high shift transmission pulley train and the output shaft.

Continuous variable transmission device with high shift transmission pulley train

The present invention seeks to provide a simple, low cost and easy-to-install (or remove) device for two-cycle engines which improves engine efficiency through more complete combustion, resulting in increased engine rpm and a decrease in emissions. The invention specifically relates to an insert device which is located upstream of the carburetor, preferably in a coupler which typically extends between an air cleaner and the carburetor of a two-cycle engine. The insert itself is generally formed as a tubular member (of one or more pieces) tapering from a larger inlet side to a smaller outlet side, with or without surface irregularities, i.e., ribs, flutes, etc., formed on its interior surface. It is important that the tuned air insert be located such that its lower edge, i.e., on the outlet side, be raised above the coupler outlet and carburetor inlet, and that the coupler surrounding the tuned air insert have a diameter sufficiently greater than that of at least a portion of the insert, so as to create a chamber surrounding the insert, immediately above and open to the carburetor inlet.

Tuned air insert for internal combustion engines and related process

An apparatus for adjusting the specific volume of intake air for an engine has an orifice (5) for controlling the amount of air to by-pass a throttle valve. The apparatus is provided with a lattice-shaped heating element (8) which is disposed on the downstream side of the orifice. Thus, carbon and other substances which may flow back from the engine are trapped and burnt by the heating element.

Apparatus for adjusting specific volume of intake air for engine

A carburetor for an internal combustion engine has a circuit for delivering a primary air/fuel mixture into the induction passage and means for correcting the richness of the airfuel mixture in dependence of the amplitude of the alternating component of the depression which prevails in operation in the induction passage. The correction device has a movable member which meters an air or fuel flow cross-sectional area in the circuit. The position of the movable member is controlled in dependence of the alternating component by a pressure sensitive diaphragm. A frequency filter connects the induction passage and chambers separated by the diaphragm for dampening the alternating component of the depression by an amount which increases with the frequency of that component.

Carburetors for internal combustion engines

A system for controlling pressure in a container, for example the carburetor of an internal combustion engine, from a periodic acoustic source, for example the intake or exhaust of the engine or a selected engine component where the alternating pressure varies only slightly according to engine speed where it is desired to modify the slope of a fuel richness curve over a wide operating range. The system is characterized in that it comprises a conduit connecting the container chamber to the acoustic source, the pressure losses being different according to the direction of flow in the conduit.

System for controlling pressure by acoustic means

An improvement for internal combustion engine carburetors of the variable diffuser type with a sonic throat, the diffuser having a circular intake passage leading to an obstacle in the form of a body of revolution of maximum diameter appreciably larger than the intake passage, coaxial with the passage and axially adjustable to form, with a fixed divergent circular wall prolonging the intake passage of the carburetor barrel, a circular divergent sonic-flow nozzle, the annular throat of which is formed between the intake passage and the nearest surface of the adjustable obstacle.

Pierre Fontanet

Papers

System for controlling pressure by acoustic means

Variable diffuser for carburetors

Diffusor fuer vergaser von brennkraftmaschinen