Motoyuki Abe

Bio: Motoyuki Abe is an academic researcher from Hitachi. The author has contributed to research in topics: Fuel injection & Internal combustion engine. The author has an hindex of 14, co-authored 82 publications receiving 817 citations.

Fuel Injection Valve

Abstract: A fuel-injection valve includes a fuel-injection hole, a valve element and a valve seat for opening and closing the fuel-injection hole, a force-applying member for applying force to the valve element in a direction of motion of the valve element, and a drive unit for applying force to the valve element in the direction opposite to that of the force applied by the force-applying member; wherein a secondary oscillation system, which interacts with a primary oscillation system including the valve element and the force-applying member, is added to the primary oscillation system, and the phase angle of force applied to the primary oscillation system by the secondary oscillation system is also staggered from that of force applied to the primary oscillation system, which is other than the force applied to the primary oscillation system by the secondary oscillation system, whereby the bouncing of the valve element during opening and closing of the valve is reduced, which in turn makes it possible to achieve very accurate fuel-injection control.

Drive Device for Fuel Injection Device

Abstract: An object of this disclosure is to provide a fuel injection device that can reliably detect an operation timing of a valve body, that is, a valve opening timing with high accuracy. The current of an electromagnetic valve reaches I2 at time t3, an FET 201 and an FET 221 are turned on, and a battery voltage VB is applied to the electromagnetic valve until time t5 is reached. The amount of displacement of the valve body reaches a target amount of control lift at time t4 between time t3 and time t5, that is, a movable core 304 comes into contact with a fixed core 301. The detection of the valve opening timing is performed during the period from time t3 to time t5.

Electromagnetic fuel injector

Abstract: An electromagnetic fuel injector for internal combustion engine, wherein the inner periphery of a fuel turning element (21) disposed at the tip of a nozzle body (18) and the inner periphery of a non-magnetic cylindrical seal ring (8) pressed in and welded to one end inner periphery of the nozzle body and one end outer periphery of the nozzle body of a fixed core (1) are formed as a guide to slidably guide a stroking operation of a movable element (5), the fuel turning element is held between a receiving surface (18e) of the nozzle body and an orifice plate (19), fuel flows to a path groove (26) provided in the lower end surface of the fuel turning element through an annular fuel path (22) formed between the outer periphery of the fuel turning element and the inner periphery (18f) of the nozzle body, and a mass body (9) movable in axial direction is provided, independently of the movable element, between a return spring (7) and the movable element and a plate spring (50) is provided between the mass body and the movable element.

Drive device for fuel injection device, and fuel injection system

Abstract: A drive device capable of detecting individual variations of an injection quantity of a fuel injection device of each cylinder and adjusting a current waveform provided to an injection pulse width and a solenoid such that the individual variations of the fuel injection devices are reduced. The fuel injection device in the present invention includes a valve body 114 that closes a fuel passage by coming into contact with a valve seat 118 and opens the fuel passage by separating from the valve seat 118 and a magnetic circuit constructed of a solenoid 105, a fixed core 107, a nozzle holder 101, a housing 103, and a needle 102 and when a current is supplied to the solenoid 105, a magnetic suction force acts on the needle 102 and the needle 102 has a function to open the valve body 114 by colliding against the valve body 114 after performing a free running operation and changes of acceleration of the needle 102 due to collision of the needle 102 against the valve body 114 are detected by a current flowing through the solenoid 105.

Solenoid fuel injection valve

Abstract: PROBLEM TO BE SOLVED: To enable minute control of an fuel injection amount while suppressing secondary injection, and to enable multi-stage injection at short injection intervals by quickly stabilizing a movable element after closing a valve.SOLUTION: A solenoid fuel injection valve includes the movable element 102 retained in a relatively displaceable condition in a driving force direction by a driving means relative to a valve element 103, a first urging means 106 urging the valve element 103 in a direction opposite from the driving force direction by the driving means, and a second urging means 106 urging the movable element 102 in the driving force direction by the driving means. An urging force of the second urging means is set smaller than or equal to the sum of a value obtained by multiplying the product of a valve closing speed (m/s) and a mass (kg) of the movable element by -7.5×10and a value obtained by multiplying the sum (kg) of the mass of the movable element and the mass of the valve element by 2.6×10. Moreover, the product of the valve closing speed (m/s) and the mass (kg) of the movable element is set greater than or equal to a value obtained by multiplying a value divided by the minimum injection interval (s) permitting consecutive spray in performing two or more injections to exist relatively independently by 2.0.

Fuel Injection Valve

Abstract: A fuel injection valve is provided that includes a valve seat member ( 3 ) having a conical valve seat ( 8 ) and a valve hole ( 7 ) formed through a central part of the valve seat ( 8 ), a valve body ( 18 ) working in cooperation with the valve seat ( 8 ), and an injector plate ( 10 ) joined to the valve seat member ( 3 ) and having a plurality of fuel injection holes ( 11 ) radially outwardly displaced from the valve hole ( 7 ), a diffusion chamber ( 39 ) providing communication between the valve hole ( 7 ) and the fuel injection holes ( 11 ) being provided between the valve seat member ( 3 ) and the injector plate ( 10 ), wherein the diffusion chamber ( 39 ) formed between the valve seat member ( 3 ) and the injector plate ( 10 ) is in an annular shape, has a diameter that is larger than that of the valve hole ( 7 ), and has inner ends of the fuel injection holes ( 11 ) opening therein, and a plurality of fuel passages ( 42 a , 42 b ) are disposed within the valve hole ( 7 ), the plurality of fuel passages ( 42 a , 42 b ) reversing within the valve hole ( 7 ) fuel that has passed through the valve seat ( 8 ) and guiding the fuel to the diffusion chamber ( 39 ). This enables atomization of injected fuel to be promoted and penetrability to be improved for the fuel injection valve.

Surgical instrument access device

Abstract: A surgical access device includes a single valve that forms a seal with a body wall and provides an access channel into a body cavity. The valve has properties for creating a zero seal in the absence of an instrument as well as an instrument seal for an instrument having a diameter up to about 37 mm. The valve can include a gel material and the access channel can include a protective sleeve to provide for wound protection during insertion and withdrawal of a sharp surgical instrument. The valve further comprises a cap ring which may be inserted or molded with the gel material. The protective sleeve may be bonded or molded around an inner diameter of the cap ring. The protective sleeve may be a single tubular member, or may comprise a plurality of axially extending sleeve members having a plurality of axial slits. The protective sleeve and the cap ring may comprise of the same or different materials. The surgical access device further comprises at least one support ring disposed circumferentially of the valve forming a hollow space, and a wound retractor operatively placed in the hollow space. The wound retractor includes an inner ring, an outer ring, and a flexible sleeve connecting the inner ring and the outer ring.

Electromagnetic fuel injection valve

Abstract: 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).

Fuel-injection valve

Abstract: 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).

High-pressure fuel supply pump

Abstract: In a high pressure fuel supply pump for transmitting rotation of a cam to a reciprocating plunger via a tappet and a retainer, a diametric force acting on the plunger is reduced. The pump includes the retainer disposed on the plunger and a return spring exerting an urging force on the retainer in a direction of the tappet. A clearance between a plunger leading end and a tappet bottom surface opposed thereto is set to be greater than a clearance between a retainer bottom surface and the tappet bottom surface opposed thereto, and a clearance between a retainer inside diameter section and a plunger peripheral surface section opposed thereto is set to be greater than a clearance between a retainer outside diameter section and a tappet inner wall opposed thereto.