Electronically controlled fuel injection device

An electronically controlled fuel injection device comprising:

• a positive displacement, electromagnetically driven pump arranged to perform a pressure-feeding stroke, having an initial stage and a later stage, for use in pumping fuel under pressure from a fuel tank;
• an inlet orifice nozzle operably coupled to said electromagnetically driven pump and having an inlet nozzle orifice part arranged to allow passage therethrough of the fuel pumped by said electromagnetically driven pump;
• an outlet orifice nozzle having an intake side operably coupled to said inlet orifice nozzle and an output side to be coupled to a return line for return of fuel to the fuel tank, said outlet orifice nozzle comprising an outlet nozzle orifice part arranged to allow a specified amount of the fuel that has passed through said inlet nozzle orifice part to pass from said intake side out through said output side to be returned to the fuel tank;
• an injection nozzle, operably coupled to said inlet orifice nozzle and arranged to be coupled to an intake passage of an engine, so as to inject an amount of fuel into the intake passage of the engine equal to a difference between an amount of the fuel that has passed through said inlet nozzle orifice part and the specified amount of the fuel that has passed out through said output side to be returned to the fuel tank;
• a circulation passage arranged to be operably coupled to the fuel tank to circulate fuel pressurized to a first specified pressure by said electromagnetically driven pump back to the fuel tank;
• a valve body arranged to allow fuel flow through said circulation passage back to the fuel tank during said initial stage of said pressure-feeding stroke of said electromagnetically driven pump and to block fuel flow through said circulation passage back to the fuel tank during said later stage of said pressure-feeding stroke of said electromagnetically driven pump;
• and
• a control arrangement operably coupled to said electromagnetically driven pump to control said electromagnetically driven pump in response to a cycle of the engine.

An electronically controlled fuel injection device comprising:

• a positive displacement, electromagnetically driven pump arranged to perform a pressure-feeding stroke, having an initial stage and a later stage, for use in pumping fuel under pressure from a fuel tank;
• an inlet orifice nozzle operably coupled to said electromagnetically driven pump and having an inlet nozzle orifice part arranged to allow passage therethrough of the fuel pumped by said electromagnetically driven pump;
• an injection nozzle, operably coupled to said inlet orifice nozzle and arranged to be coupled to an intake passage of an engine, so as to inject the fuel that has passed through said inlet orifice nozzle into the intake passage of the engine when the pressure of the fuel reaches at least a first specified pressure;
• a circulation passage arranged to be operably coupled to the fuel tank to circulate fuel pressurized to a second specified pressure by said electromagnetically driven pump back to the fuel tank;
• a valve body arranged to allow fuel flow through said circulation passage back to the fuel tank during said initial stage of said pressure-feeding stroke of said electromagnetically driven pump and to block fuel flow through said circulation passage back to the fuel tank during said later stage of said pressure-feeding stroke of said electromagnetically driven pump;
• and
• a control arrangement operably coupled to said electromagnetically driven pump to control said electromagnetically driven pump in response to a cycle of the engine;
• wherein said electromagnetically driven pump, said circulation passage and said valve body are arranged such that said electromagnetically driven pump, during said initial stage of said pressure-feeding stroke, generates fuel pressure to cause said fuel flow through said circulation passage to allow the fuel to return to the fuel tank.

An electronically controlled fuel injection device comprising:

• a positive displacement, electromagnetically driven pump arranged to perform a pressure-feeding stroke, having an initial stage and a later stage, for use in pumping fuel under pressure from a fuel tank;
• an inlet orifice nozzle operable coupled to said electromagnetically driven pump and having an inlet nozzle orifice part arranged to allow passage therethrough of the fuel pumped by said electromagnetically driven pump;
• an injection nozzle, operably coupled to said inlet orifice nozzle and arranged to be coupled to an intake passage of an engine, so as to inject the fuel that has passed through said inlet orifice nozzle into the intake passage of the engine when the pressure of the fuel reaches at least a first specified pressure;
• a circulation passage arranged to be operably coupled to the fuel tank to circulate fuel pressurized to a second specified pressure by said electromagnetically driven pump back to the fuel tank;
• a valve body arranged to allow fuel flow through said circulation passage back to the fuel tank during said initial stage of said pressure-feeding stroke of said electromagnetically driven pump and to block fuel flow through said circulation passage back to the fuel tank during said later stage of said pressure-feeding stroke of said electromagnetically driven pump;
• and
• a control arrangement operably coupled to said electromagnetically driven pump to control said electromagnetically driven pump in response to a cycle of the engine;
• wherein said electromagnetically driven pump comprises a plunger-receiving body having a passage extending therethrough, and a plunger reciprocally disposed in said passage of said plunger-receiving body;
• wherein a spill port is formed in said pressure-receiving body and communicates with said circulation passage;
• and
• wherein said valve body is constituted by said plunger and is arranged to open said spill port in said initial stage of said pressure-feeding stroke to allow the fuel flow through said circulation passage and to close said spill port in said later stage of said pressure-feeding stroke to block the fuel flow through said circulation passage.

An electronically controlled fuel injection device comprising:

• a positive displacement, electromagnetically driven pump comprising a plunger-receiving body having a passage extending therethrough, and a plunger reciprocally disposed in said passage of said plunger-receiving body, an operating chamber being defined at least partially in said plunger-receiving body at one end of said plunger, said electromagnetically driven pump being arranged to perform a fuel-suction stroke to reduce pressure in said operating chamber to draw fuel thereinto from a fuel tank, and a pressure-feeding stroke, having an initial stage and a later stage, for use in pumping fuel under pressure from said operating chamber;
• an inlet orifice nozzle operably coupled to said operating chamber and having an inlet nozzle orifice part arranged to allow passage therethrough of the fuel in said operating chamber when pumped by said electromagnetically driven pump;
• an injection nozzle, operably coupled to said inlet orifice nozzle and arranged to be coupled to an intake passage of an engine, so as to inject the fuel that has passed through said inlet orifice nozzle into the intake passage of the engine when the pressure of the fuel reaches at least a first specified pressure;
• a circulation passage arranged to be operably coupled to the fuel tank to allow circulation of the fuel front said operating chamber back to the fuel tank when the fuel in said operating chamber is pressurized to a second specified pressure by said electromagnetically driven pump;
• and
• a control arrangement operably coupled to said electromagnetically driven pump to control said electromagnetically driven pump in response to a cycle of the engine.