High speed carburetion system for compressed air assisted injection
AssigneeHomelite Technologies, Ltd.
InventorsSamer Aljabari, Scott R. Shaw
Life of this patent
Estimating the term…
Abstract
An internal combustion engine having a crankcase, a cylinder connected to the crankcase, a compressed air assisted fuel injection system connected between the crankcase and the cylinder, and a reciprocating piston head located in the cylinder. The improvement comprises a fuel delivery system having two carburetors that switch delivery of fuel to two different locations based upon the speed of the engine. The system uses an accumulator with piston ported reflected compression wave delivery of scavenged compressed air to deliver fuel at a wide open throttle position.
Claims40
In an internal combustion engine having a crankcase, a cylinder connected to the crankcase, a compressed air assisted fuel injection system connected between the crankcase and the cylinder, and a reciprocating piston head located in the cylinder, wherein the improvement comprises:
- a fuel delivery system having two carburetors that switch delivery of fuel to two different locations based upon the speed of the engine, and uses an accumulator with piston ported reflected compression wave delivery of scavenged compressed air to deliver fuel at a wide open throttle position.
A carburetor system for use with an internal combustion engine, the carburetor system comprising:
- a frame forming two air conduits;
- a fuel metering device connected to the frame for delivering fuel to the two air conduits;
- and
- a fuel delivery varying system for varying amounts of fuel delivered from the fuel metering device to the two air conduits when speed of the engine or load on the engine changes, wherein the fuel delivery varying system is adapted to increase fuel delivery to a first one of the air channels with a substantially simultaneous decrease in fuel delivery to a second one of the air channels.
A method of delivering fuel in a carburetor to an internal combustion engine, the method comprising steps of:
- delivering liquid fuel from a fuel supply to a first air channel of the carburetor;
- delivering liquid fuel from the fuel supply to a second air channel of the carburetor;
- and
- decreasing fuel delivery to the first air channel when fuel delivery is increased to the second air channel;
- wherein fuel is delivered from the same fuel supply through the first and second air channels to two respective spaced locations for delivery to a same cylinder of the engine, and wherein a flow rate per piston cycle of fuel delivery to a first one of the spaced locations through the first air channel is decreased as a flow rate per piston cycle of fuel delivery to a second one of the spaced locations through the second air channel is increased.
A method of delivering fuel in a carburetor to an internal combustion engine, the method comprising steps of:
- delivering fuel from a fuel supply to a first air channel of the carburetor;
- delivering fuel from the fuel supply to a second air channel of the carburetor;
- decreasing fuel delivery to the first air channel when fuel delivery is increased to the second air channel;
- and
- stopping substantially all fuel delivery to the first air channel when the engine is at a wide open throttle condition and fuel delivery to the second air channel is at a maximum rate per piston cycle,
- wherein fuel is delivered from the same fuel supply through the first and second air channels to two respective spaced locations for delivery to a same cylinder of the engine, and wherein a flow rate and piston cycle of fuel delivery to a first one of the spaced locations through the first air channel is decreased as a flow rate per piston cycle of fuel delivery to a second one of the spaced locations through the second air channel is increased.
A method of delivering fuel in a carburetor to an internal combustion engine, the method comprising steps of:
- delivering fuel from a fuel supply to a first air channel of the carburetor;
- delivering fuel from the fuel supply to a second air channel of the carburetor;
- decreasing fuel delivery to the first air channel when fuel delivery is increased to the second air channel;
- and
- stopping substantially all fuel delivery to the second air channel when the engine is at an idle condition and fuel delivery to the first air channel is at a maximum rate per piston cycle,
- wherein fuel is delivered from the same fuel supply through the first and second air channels to two respective spaced locations for delivery to a same cylinder of the engine, and wherein a flow rate and piston cycle of fuel delivery to a first one of the spaced locations through the first air channel is decreased as a flow rate per piston cycle of fuel delivery to a second one of the spaced locations through the second air channel is increased.
A method of delivering fuel in a carburetor to an internal combustion engine, the method comprising steps of:
- delivering fuel to a first air channel of the carburetor;
- delivering fuel to a second air channel of the carburetor;
- and
- decreasing fuel delivery to the first air channel when fuel delivery is increased to the second air channel;
- wherein fuel is delivered through the first and second air channels to two respective spaced locations for delivery to a same cylinder of the engine, wherein a flow rate and piston cycle of fuel delivery to a first one of the spaced locations through the first air channel is decreased as a flow rate per piston cycle of fuel delivery to a second one of the spaced locations through the second air channel is increased, and wherein the step of delivering fuel to the second air channel comprises using suction from a crankcase of the engine to pull fuel into the second air channel.
A method of delivering fuel in a carburetor to an internal combustion engine, the method comprising steps of:
- delivering fuel from a fuel supply to a first air channel of the carburetor;
- delivering fuel from the fuel supply to a second air channel of the carburetor or;
- and
- decreasing fuel delivery to the first air channel when fuel delivery is increased to the second air channel;
- wherein fuel is delivered from the same fuel supply through the first and second air channels to two respective spaced locations for delivery to a same cylinder of the engine, wherein a flow rate and piston cycle of fuel delivery to a first one of the spaced locations through the First air channel is decreased as a flow rate per piston cycle of fuel delivery to a second one of the spaced locations through the second air channel is increased, and wherein the step of decreasing fuel delivery to the first air channel when fuel delivery is increased to the second air channel comprises rotating a single shaft of a throttle shaft assembly to increase air flow through both the first and the second air channels.
A method of delivering fuel in a carburetor to a two-stroke internal combustion engine, the method comprising steps of:
- delivering fuel to a fuel and air delivery channel in the carburetor;
- and
- varying an amount of fuel being delivered to the fuel and air delivery channel based, at least partially, upon suction generated by air being pulled through a main air channel of the carburetor into a crankcase of the engine, wherein substantially all the fuel in the fuel and air delivery channel is introduced into a combustion chamber of the engine without passing through the crankcase.
In an internal combustion engine having a crankcase, a cylinder connected to the crankcase, a compressed air assisted fuel injection system connected between the crankcase and the cylinder, and a reciprocating piston head located in the cylinder, wherein the improvement comprises:
- a fuel delivery system having two carburetor sections with a throttle shaft assembly extending into the two carburetor sections, wherein the throttle shaft assembly comprises a shaft, a throttle plate attached to the shaft and a channel in the shaft, and wherein the throttle plate is located at a first one of the carburetor sections and the channel of the shaft is located at a second one of the carburetor sections.
A carburetor system for use with an internal combustion engine, the carburetor system comprising:
- a first carburetor section;
- a second carburetor section;
- and
- a common throttle shaft assembly extending through both the first and second carburetor sections, the shaft assembly comprising a throttle plate located in a main air passageway of the first carburetor section and a throttle shaft having the throttle plate connected thereto, the throttle shaft extending into a channel in the second carburetor section and being rotatable to increase and decrease a flow path through the channel as the shaft is rotated.
A method of controlling delivery of fuel/air mixtures in a carburetor system for an internal combustion engine, the method comprising steps of:
- providing the carburetor system with two carburetor sections for creating two different fuel/air mixtures and a common control shaft assembly which extends through two separate conduits in the respective two carburetor sections;
- and
- rotating the common control shaft assembly to open or restrict pathways through the two conduits,
- wherein a first one of the conduits is smaller than a second one of the conduits, and wherein the control shaft comprises a plate attached to the control shaft in the first conduit and a hole through the control shaft at the second conduit,
- wherein the hole can be aligned with and misaligned with the second conduit when the control shaft is rotated to open or restrict the pathway through the hole and the second conduit.
In an internal combustion engine having a crankcase, a cylinder connected to the crankcase, a compressed air assisted fuel injection system connected between the crankcase and the cylinder, and a reciprocating piston head located in the cylinder, wherein the improvement comprises:
- a fuel delivery system having two carburetor sections with a throttle shaft assembly and a choke shaft assembly, each of the two carburetor sections having a respective air flow channel, and each of the shaft assemblies extending into both of the two air flow channels of the two carburetor sections.
In an internal combustion engine having a crankcase, a cylinder connected to the crankcase, a compressed air assisted fuel injection system connected between the crankcase and the cylinder, and a reciprocating piston head located in the cylinder, wherein the improvement comprises:
- a fuel delivery system having two carburetor sections with a throttle shaft assembly and a choke shaft assembly operably connected to two air flow channels of the two carburetor sections, wherein a first one of the air flow channels has a smaller cross-sectional flow path than a second one of the air flow channels.
In an internal combustion engine having a crankcase, a cylinder connected to the crankcase, a compressed air assisted fuel injection system connected between the crankcase and the cylinder, and a reciprocating piston head located in the cylinder, wherein the improvement comprises:
- a fuel delivery system having two carburetor sections with a throttle shaft assembly and a choke shaft assembly operably connected to two air flow channels of the two carburetor sections, wherein a first one of the air flow channels is connected to a crankcase of the engine and a second one of the air flow channels is connected to an accumulator extending between the crankcase and a cylinder of the engine.
A two-stroke internal combustion engine comprising:
- a crankcase;
- a cylinder connected to the crankcase;
- a fuel delivery system connected to the cylinder;
- a reciprocating piston movably located in the cylinder;
- and
- a combined air throttle and crankcase lubrication system for supplying combined air and lubricant into the crankcase of the engine, wherein the fuel delivery system delivers a majority of fuel directly to a combustion chamber of the cylinder without passing the majority of fuel through the crankcase, and wherein the air supplied to the crankcase with the lubricant is subsequently used to scavenge burned gases from the combustion chamber.
Dependencies are inferred from the claim text.