Two-stroke engine with fuel injection
AssigneeEastway Fair Company Limited
InventorNagesh Mavinahally
Life of this patent
Estimating the term…
Abstract
A two-stroke internal combustion engine is provided with a fuel injector. The two-stroke internal combustion engine may have at least one transfer passage, an air channel, and a fuel injector. The transfer passage is between a crankcase and a combustion chamber of the engine. The air channel is in gaseous communication with a top portion of the transfer channel. The fuel injector is in gaseous communication with the air channel and injects fuel into the air channel. The two-stroke engine may be used on hand-held, lawn and garden equipment.
Claims48
A two-stroke internal combustion engine comprising:
- a. at least one transfer passage between a crankcase and a combustion chamber of the engine;
- b. an air channel in gaseous communication with a top portion of the at least one transfer passage and ambient;
- and
- c. a fuel injector in gaseous communication with the air channel, wherein said fuel injector injects fuel into said air channel.
A two-stroke engine comprising:
- a. at least one transfer passage between a crankcase and a combustion chamber of the engine;
- b. an air channel in gaseous communication with a top portion of the at least one transfer passage and ambient;
- and
- c. a fuel injector in gaseous communication with the air channel, wherein said fuel injector injects fuel into the crankcase.
A two-stroke internal combustion engine comprising:
- a. an intake system connected to a block of the engine;
- b. a rotary throttle valve disposed within the intake system adapted to control air flow into the block;
- and
- c. a fuel injector disposed within the intake system between the rotary throttle valve and the block, the fuel injector adapted to inject fuel into the air flow.
A hand-held power tool comprising:
- an operating head adapted to perform desired work;
- a two-stroke engine operably connected to said operating head, a crankshaft of the two-stroke engine driving said operating head, the two-stroke engine comprising a fuel injector and an electronic control unit, the electronic control unit generating electrical signals to control at least the timing and duration of fuel injected by the fuel injector into the two-stroke engine;
- and
- at least one handle adapted to be engaged by an operator to manually lift the operating head and the two-stroke engine.
A two-stroke internal combustion engine comprising:
- a. a first passage in communication with a crankcase chamber, a first throttle valve disposed to control air flow into the first passage;
- b. a second passage in communication with the crankcase chamber, a second throttle valve disposed to control air flow into the second passage, a fuel injector being disposed to inject fuel into the second passage;
- c. a third passage in communication with the crankcase chamber, a third throttle valve disposed to control air flow into the third passage;
- d. wherein the second passage is disposed between the first passage and the third passage, the first throttle valve and the third throttle valve being closed at low throttle speeds and the second throttle valve remaining at least partially open at low throttle speeds, air flow to the crankcase chamber thereby being constrained through the second passage at low throttle speeds.
A two-stroke internal combustion engine comprising:
- a. a first passage in communication with a first transfer port to a combustion chamber, a first throttle valve disposed to control air flow into the first passage, the first transfer port being located at a first position along a cylinder wall;
- b. a second passage in communication with a second transfer port to the combustion chamber, a second throttle valve disposed to control air flow into the second passage, the second transfer port being located at a second position along the cylinder wall, a fuel injector being disposed to inject fuel into the second passage;
- c. wherein the first position of the first transfer port is higher along the cylinder wall than the second position of the second transfer port, the first transfer port thereby opening before the second transfer port as a piston moves downward within the combustion chamber.
Dependencies are inferred from the claim text.