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US 2002/0162541 A1Published application
Fuel injection system for engine
AssigneeSanshin Kogyo Kabushiki Kaisha
InventorMasafumi Sogawa
Life of this patent
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AssigneeSanshin Kogyo Kabushiki Kaisha
InventorMasafumi Sogawa
Estimating the term…
A fuel injection system for an engine includes an improved construction and provides a method for releasing a needle valve which has adhered to a valve seat in a fuel injector. The fuel injector is a normally closed type and the valve is activated by a solenoid to part from the valve seat to inject fuel. A first power supply unit is provided to supply electric power to the solenoid under an ordinary operating condition of the engine. A second power supply unit is additionally provided to supply electric power greater than the power supplied by the first power supply unit. In one embodiment, the second power supply unit includes a booster to raise the voltage. A switchover mechanism, such as detachable couplers, are provided to switch over between the first power supply unit and the second power supply unit. In one embodiment of the method, the operator detaches the coupler of the first power supply unit from the coupler of the solenoid and joins the coupler of the solenoid to the coupler of the second power supply. Then the operator operates the second power supply unit to supply the greater power to the solenoid to break the adhesion.
A fuel injection system for an internal combustion engine having a cylinder body defining a cylinder bore in which a piston reciprocates, a cylinder head affixed to an end of the cylinder body and defining a combustion chamber with the cylinder head and the piston, the fuel injection system comprising at least one fuel injector spraying fuel through at least one opening to supply fuel to the combustion chamber, the fuel injector including a valve movable between an open position and a closed position to regulate fuel flow through the opening, an actuator to move the valve from the closed position, a first power supply to supply power to the actuator under a normal operating condition of the engine, a second power supply to supply power greater than the power supplied by the first power supply to the actuator, and a switchover device to selectively change the power supply to the actuator between the first power supply and the second power supply.
A fuel injection system for an internal combustion engine having a cylinder body defining a cylinder bore in which a piston reciprocates, a cylinder head affixed to an end of the cylinder body and defining a combustion chamber with the cylinder head and the piston, the fuel injection system comprising at least one fuel injector to spray fuel to the combustion chamber, the fuel injector including a valve and a valve seat on which the valve sits, the fuel being sprayed only when the valve is unseated, a biasing mechanism to bias the valve toward the valve seat so that the valve sits on the valve seat, an actuator mechanism to actuate the valve to unseat with an actuating force that acts against the biasing force of the biasing mechanism, the actuator mechanism being adapted also to apply a separating force that is greater than the actuating force to the valve to separate the valve from the valve seat when the valve adheres to the valve seat.
An internal combustion engine comprising a cylinder body defining a cylinder bore in which a piston reciprocates, a cylinder head affixed to an end of the cylinder body and defining a combustion chamber with the cylinder head and the piston, at least one fuel injector spraying fuel through at least one opening to supply fuel to the combustion chamber, the fuel injector including a valve and a valve seat on which the valve sits, the fuel being sprayed only when the valve is unseated, a biasing mechanism to bias the valve toward the valve seat so that the valve seats on the valve seat, actuating means for actuating the valve to be unseated with an actuating force that acts against the biasing force of the biasing mechanism, and separating means for separating the valve from the valve seat when the valve adheres to the valve seat with a separating force that is greater than the actuating force.
A method for controlling a fuel injection system having a fuel injector spraying fuel through at least one opening to supply the fuel to a combustion chamber of an internal combustion engine, and a controller for controlling the fuel injector, the fuel injector including a valve that selectively opens and closes the opening under control of the controller, the method comprising actuating the valve to open the opening with a predetermined force, and separating the valve from a close position with a separating force that is greater than the predetermined force when the valve remains in the closed position against the control of the controller.
Dependencies are inferred from the claim text.