Small Engine and Engine Work Machine Including the Same
AssigneeHitachi Koki Co., Ltd.
InventorsSasaki Toshihide, Ishida Shigetoshi, Nagase Hiroki
Life of this patent
Estimating the term…
Abstract
An engine includes: a carburetor configured to supply an air-fuel mixture of fuel and air; a crank case defining a crank chamber; a cylinder block which includes: a cylinder bore in which a reciprocable piston is disposed; and an intake port which supplies the air-fuel mixture supplied from the carburetor to the crank chamber; a control valve configured to open and close the intake port; and a controller configured to control the control valve. The controller controls the number of times that the control valve closes the intake port with respect to the number of times that the piston moves up to thereby reduce pressure of the crank chamber.
Claims19
An engine comprising:
- a carburetor configured to supply an air-fuel mixture of fuel and air;
- a crank case defining a crank chamber;
- a cylinder block which includes:
- a cylinder bore in which a reciprocable piston is disposed;
- and
- an air-fuel mixture passage communicating the carburetor with a combustion chamber of the cylinder block to supply the air-fuel mixture from the carburetor to the combustion chamber,
- a magnetic flux generator which includes a coil and is configured to generate a magnetic flux by applying a current to the coil;
- and
- a control valve configured to close at least a part of the air-fuel mixture passage in response to the current applied to the coil.
An engine comprising:
- a carburetor configured to supply an air-fuel mixture of fuel and air;
- a crank case defining a crank chamber;
- a cylinder block which includes:
- a cylinder bore in which a reciprocable piston is disposed;
- and
- an intake port which supplies the air-fuel mixture supplied from the carburetor to the crank chamber;
- a control valve configured to open and close the intake port;
- and
- a controller configured to control the control valve,
- wherein the controller controls the number of times that the control valve closes the intake port with respect to the number of times that the piston moves up to thereby reduce pressure of the crank chamber.
Dependencies are inferred from the claim text.