The invention relates to an injector used for an internal combustion engine, in which a favorable magnetic attraction force is obtained to reduce a controllable minimum injection amount of a fuel injection amount. In a fuel injection valve in which a fixed core (107) and a moving element (114) is contained inside a pipe-shaped member (101), and a coil (105) and a yoke (103) are provided on an outer side thereof, a space for placing the coil (105) is placed so that an inner circumference length in a vertical section of the space becomes smaller than an outside diameter of the yoke (103), or a height of the space in an axial direction of the fixed core (107) becomes smaller than a diameter of the fixed core (107).

Electromagnetic fuel injection valve

The invention relates to a fuel-injection valve, in particular a high-pressure injection valve for directly injecting fuel into a combustion chamber of a compressed-mixture, spark-ignition internal combustion engine. Said valve is characterised in that an outlet opening (23) is provided downstream of the valve seat (20), the downstream end of said opening having a slit-forming element (30) that to a great extent closes the outlet opening (23). A slit-type flow outlet (35), through which a fuel spray can be discharged in a fan-type jet, is formed between the slit-forming element (30) and a front face (34) of the valve seat body (16).

Fuel-injection valve

A two-cycle internal combustion engine comprises a cylinder head having an intake port and exhaust port opened to a combustion chamber, to which compressed fresh air is introduced via an intake valve. The intake and exhaust valves are operated in response to a crank angle. A pulsation pressure of exhaust gas in the exhaust port is substantially restrained during an idling or light load running condition. The exhaust valve is opened earlier than the intake valve when the speed of the downward movement of the piston is relatively high, such that a part of exhaust gas in the exhaust port flows back to the combustion chamber in that condition. An exhaust gas swirl rotating around a cylinder axis is formed when the exhaust gas flows back and the fresh air is slowly introduced onto the exhaust gas swirl in that condition.

Two-cycle internal combustion engine

A cylinder injection type internal combustion engine in which a lower side of a cylinder head (8) forming an upper side of a combustion chamber (3) is formed into a pent-roof shape comprising an intake valve side inclined lower side (8a) and an outlet valve side inclined lower side (8b) with an ignition plug (6) being disposed in the vicinity of a top portion of an upper side of the pent-roof shaped combustion chamber (3), and in which a top surface of a piston (2) forming a lower side of the combustion chamber (3) is formed into a pent-roof shape having an intake valve side inclined upper side (2a) and an outlet valve side inclined upper side (2b) that correspond to the intake valve side inclined lower side (8a) and outlet valve side inclined lower side (8b), respectively, with a recessed portion (25) being disposed in the intake valve side upper side (2a) at the top surface of the piston (2).

Cylinder injection type internal combustion engine

A method of forming an atomizing spray nozzle includes the steps of etching a swirl chamber and a spray orifice in a thin sheet of material. The swirl chamber is etched in a first side of the disk and the spray orifice is etched through a second side to the center of the swirl chamber. Feed slots are etched in the first side of the disk extending non-radially to the swirl chamber such that liquid can be conveyed to the swirl chamber so as to create and sustain the swirling motion. A inlet piece with inlet passage therein is connected with first side of the disk so as to convey liquid to the feed slots of the disk and to enclose the feed slots and swirl chamber. In addition to the method described an atomizing spray nozzle having the configuration described is much improved in its spray characteristics. The present invention also provides a method of forming a number of spray nozzles simultaneously in a single manufacturing process.

Spray nozzle and method of manufacturing same

A fuel injection valve includes an injector body having a fuel injection hole and an adapter having a fuel collision surface, two air injection holes and two injected fuel paths. The fuel injected from the fuel injection hole flows in a slug-like pattern and collides with the fuel collision surface where the fuel is atomized a first time. Then, the fuel flows in a direction away from an axis of the adapter in a membrane-like pattern getting thinner in thickness to be finally broken to pieces, that is, to be atomized a second time. The air injected from the air injection holes collides with the membrane-like pattern of fuel to be atomized a third time before the fuel goes out of the injected fuel paths.

Fuel injection valve with an air assist adapter for an internal combustion engine

An air-fuel ratio control device for an internal combustion engine controls an air-fuel ratio to the lean side rather than to a stoichiometric air-fuel ratio by the use of a factor determined in accordance with inlet pipe pressure and engine speed. A throttle opening degree sensor is provided to detect a degree of throttle opening, and on the basis of the degree of throttle opening, the factor determined in accordance with the inlet pipe pressure and the engine speed is corrected in a high load range of the engine. Since the output of the throttle opening degree sensor in the high load range of the engine is more accurate than the output of a pressure sensor for detecting the inlet pipe pressure, the air-fuel ratio can be controlled accurately in the high load range by correcting the factor in accordance with the degree of throttle opening.

Air-fuel ratio control device for internal combustion engine

An internal combustion engine provided with a first port of a helical shape and second port of a straight shape opened to the combustion chamber. The first port provides a swirl motion in the cylinder, while the second port is opened to the combustion chamber at a position near the spark electrodes located at the upper portion of the combustion chamber in the center thereof. An intake control valve selectively opens or closes the second intake port in accordance with operating conditions of the engine. A main injector is arranged in the second port downstream of the intake control valve. The injector is so controlled that it opens substantially during the intake stroke when the intake control valve is closed. The injector is controlled to inject at the period substantially not located in the intake stroke.

Internal combustion engine with two intake valves

A fuel injection type internal combustion engine comprising a cylinder head having a flat inner wall, and a piston having a flat top face. The flat inner wall and the flat top face form a squish area therebetween. A recess having a lung shaped cross-section is formed in the cylinder head. A shallow groove is formed on the flat inner wall of the cylinder head so as to extend from the intake valve to the recess. The exhaust valve is arranged on the bottom of the recess. A depression connected to the recess is formed on the shallow groove. The spark plug is arranged in the depression. The cylinder head has a portion located between the recess and the intake passage. A fuel injector is arranged in the intake passage. The nozzle of the fuel injector is directed to an inner wall portion of the intake passage, which is located near the recess.

Fuel injection type internal combustion engine

An internal combustion engine having two intake valves arranged in respective intake passages for each cylinder, wherein, a first intake passage is arranged to cause a swirl of intake air in the combustion chamber and a fuel injector is arranged in this intake passage, and a flow control valve is arranged in the second intake passage to close same when the engine load is low. An EGR passage is provided with an outlet in the second intake passage at a position between the second intake valve and the flow control valve, and the EGR gas is thus delivered to a volume enclosed in the second intake passage between the second intake valve and the flow control valve and remains there while these valves are closed. Then, when the second intake valve is open, the EGR gas slowly flows into the combustion chamber and floats toward and is collected at the upper region in the combustion chamber, while fuel flows smoothly into the combustion chamber, together with intake air, through the first intake passage.

Taiyo Kawai

Papers

Fuel injection valve with an air assist adapter for an internal combustion engine

Air-fuel ratio control device for internal combustion engine

Internal combustion engine with two intake valves

Fuel injection type internal combustion engine

Internal combustion engine with multiple intake valves and EGR arrangement