Abstract: Provided is a fuel injection valve which achieves both atomization of a fluid spray and improvement of the degree of freedom in design of a spray shape, a spray direction, etc. According to a fuel injection valve (1) of the present invention, at least one of injection holes is a switching-spray injection hole (12B), which corresponds to an injected spray, directions of a long axis and a short axis of a switching spray (32A) changing due to an axis-switching phenomenon to deform the switching spray (32A) at downstream. The plurality of injection holes other than the switching-spray injection hole (12B) are coalescent-spray injection holes (12A) for forming a coalescent spray (40) formed by coalescence under Coanda effect exerted between single sprays (30A, 31A). The coalescent spray (40) and the switching spray (32A) coalesce under the Coanda effect to form an integrated spray (50).

Abstract: A mist forming method using a fluid injection valve formed of a valve seat, a valve body, and a nozzle portion or an injection hole plate having injection holes, and configured to turn in-hole flows and flows immediately below the injection holes into substantially liquid film flows. Directions of jets from the injection holes are not necessarily brought into coincidence with a center axis direction of the injection holes and are not necessarily crossed with one another in a downstream part, and after the jets turned into mists at a position downstream of a break length position, the mists are allowed to come close or gather by the Coanda effect so as to appear substantially as one solid mist, and allowed to keep gathering until catching of ambient air and a resulting air flow along a downstream flow direction in a predetermined in-mist portion attenuate.

Abstract: A method of generating a spray by a fluid injection valve is provided. The fluid injection valve includes a valve seat (10), a valve body (8), and an orifice plate (11) having a plurality of orifices (12). The flows in the orifices and the flows directly below the orifices are configured to be substantially liquid film flows. The directions of jet flows (30), (31) from the respective orifices (12) are not necessarily matched to the central axis directions of the orifices and are not necessarily intersected with each other at a downstream position thereof. The sprays are caused to converge by the Coanda effect acting on a plurality of sprays after jet flows from the orifices (12) become sprays at a downstream position farther than a break-up length (a). The convergence of the sprays is continued until the Coanda effect is substantially lost.

Abstract: Provided is a fuel injection valve which achieves both atomization of a fluid spray and improvement of the degree of freedom in design of a spray shape, a spray direction, etc. According to a fuel injection valve (1) of the present invention, at least one of injection holes is a switching-spray injection hole (12B), which corresponds to an injected spray, directions of a long axis and a short axis of a switching spray (32A) changing due to an axis-switching phenomenon to deform the switching spray (32A) at downstream. The plurality of injection holes other than the switching-spray injection hole (12B) are coalescent-spray injection holes (12A) for forming a coalescent spray (40) formed by coalescence under Coanda effect exerted between single sprays (30A, 31A). The coalescent spray (40) and the switching spray (32A) coalesce under the Coanda effect to form an integrated spray (50).

Abstract: A mist forming method using a fluid injection valve formed of a valve seat, a valve body, and a nozzle portion or an injection hole plate having injection holes, and configured to turn in-hole flows and flows immediately below the injection holes into substantially liquid film flows. Directions of jets from the injection holes are not necessarily brought into coincidence with a center axis direction of the injection holes and are not necessarily crossed with one another in a downstream part, and after the jets turned into mists at a position downstream of a break length position, the mists are allowed to come close or gather by the Coanda effect so as to appear substantially as one solid mist, and allowed to keep gathering until catching of ambient air and a resulting air flow along a downstream flow direction in a predetermined in-mist portion attenuate.

Abstract: A method of generating a spray by a fluid injection valve is provided. The fluid injection valve includes a valve seat (10), a valve body (8), and an orifice plate (11) having a plurality of orifices (12). The flows in the orifices and the flows directly below the orifices are configured to be substantially liquid film flows. The directions of jet flows (30), (31) from the respective orifices (12) are not necessarily matched to the central axis directions of the orifices and are not necessarily intersected with each other at a downstream position thereof. The sprays are caused to converge by the Coanda effect acting on a plurality of sprays after jet flows from the orifices (12) become sprays at a downstream position farther than a break-up length (a). The convergence of the sprays is continued until the Coanda effect is substantially lost.

Abstract: An arbitration circuit 108 receives a read/write request from a master 101, such as a CPU, in which low latency is required, at a regular interval, such that the master 101 performs memory access with low latency. A remaining band which is not used by the master 101 is allocated to masters 102 and 103, such as a DMA controller, in which a wideband is required, thereby ensuring a necessary band. When a read/write request is retained in a buffer 119 of a slave 118, the arbitration circuit 108 suppresses the acceptance of the read/write requests from the masters 102 and 103 having low priority. Therefore, it is possible to provide a bus arbitration apparatus capable of transmitting a request from a specific master to a slave with low latency, and to ensure a band necessary for another master.

Abstract: A valve seat 14 having an injection hole 14b is fixed at one end of a hollow valve main body 15, a valve body 12 slidably supported so as to be separated from and brought into contact with the valve seat 14 to open and close the injection hole 14b and a swirler 16 for surrounding the valve body 12 to slidably support the valve body 12 and for imparting a swirling motion to fuel flowing into the injection hole 14b are equipped, a swirling groove 16b in the swirler 16 includes a curvature part 16b3 in a groove outlet, and a sectional configuration of the swirling groove 16b is constituted so that the depth of the central part is larger than the depth of the end part.

Abstract: Stable spray characteristics (particle size, directivity, divergence angle of spray, and penetration force) are provided for individual nozzle holes, flows of fuel toward the nozzle holes are not interfered with each other, and further spray characteristics can arbitrarily be altered at respective nozzle holes. A whirler 11 for providing a whirling force to fuel is provided, and a whirl flow is formed in a cavity 20 downstream of a seal portion of a needle valve 16. A plurality of nozzle holes 13 are formed in an orifice plate 14, and openings on the cavity 20 side of the nozzle holes 13 are formed on substantially the same diameter with respect to the central axis of a fuel injection valve 1. Thus it becomes possible to cause fuel having inflow angle and high flow velocity to flow into the openings of the nozzle holes 13.

Abstract: An access priority in bus arbitration is changed based on a cache hit ratio so as to perform the bus arbitration. In order to perform the bus arbitration, a cache hit ratio measuring device investigates a status of a cache access by a bus master. A bus arbitration managing device changes a priority in a priority storing device based on an information outputted from the cache hit ratio measuring device. Then, a bus arbitration device performs the bus arbitration in accordance with the priority.

Abstract: A valve seat 14 having an injection hole 14b is fixed at one end of a hollow valve main body 15, a valve body 12 slidably supported so as to be separated from and brought into contact with the valve seat 14 to open and close the injection hole 14b and a swirler 16 for surrounding the valve body 12 to slidably support the valve body 12 and for imparting a swirling motion to fuel flowing into the injection hole 14b are equipped, a swirling groove 16b in the swirler 16 includes a curvature part 16b3 in a groove outlet, and a sectional configuration of the swirling groove 16b is constituted so that the depth of the central part is larger than the depth of the end part.

Abstract: A fuel injection valve includes a valve seat portion, a nozzle hole plate, and a valve member. The valve seat portion has an inner circumferential surface including a valve seat. The nozzle hole plate is disposed at a downstream side of a fuel passage of the valve seat. The nozzle hole plate has a nozzle hole for injecting fuel flowing out from the fuel passage. The valve member seats on the valve seat to close the fuel passage and unseats from the valve seat to open the fuel passage. Diameter of the inner circumferential surface decreases as approaching to a downstream side. The nozzle hole of the nozzle hole plate is formed so that length of radial outside of the nozzle hole with respect to a shaft center of the fuel injection valve is smaller than that of radial inside of the nozzle hole.

Abstract: The present invention comprises a housing main body, a valve assembly disposed within the housing main body and provided with a valve main body having a large-diameter cylinder portion and a small-diameter cylinder portion, a valve seat having a fuel injection aperture secured within the valve main body and a needle valve for closing and opening the fuel injection aperture, a seal ring held between a cylinder head and a shoulder portion when the valve assembly is inserted into an insertion port in the cylinder for preventing combustion gas in the cylinder from leaking into the housing main body and a welded joint for securing the valve main body to the housing main body disposed between the side of the large-diameter cylinder portion and an engaging portion on the housing main body.

Abstract: A fuel injection valve including an orifice plate having a plurality of injection orifices, a valve seat in the upstream section of the injection orifices and has a cylindrical fuel flow path formed therein, a fuel cavity formed between the fuel flow path and the orifice plate directly above the injection orifices, and a valve member supported for its reciprocations to settle in and lift off the valve seat. The relationships among dimensions are &phgr;D1+&phgr;d<&phgr;P and t<&phgr;d, where &phgr;D1 is the diameter of the fuel flow path, &phgr;d the diameter of the injection orifices, &phgr;P the diameter of a pitch circle with its center coinciding with the axis of the fuel flow path, and t the depth in the axial direction of the fuel cavity.

Abstract: A fuel injection valve includes a valve seat portion, a nozzle hole plate, and a valve member. The valve seat portion has an inner circumferential surface including a valve seat. The nozzle hole plate is disposed at a downstream side of a fuel passage of the valve seat. The nozzle hole plate has a nozzle hole for injecting fuel flowing out from the fuel passage. The valve member seats on the valve seat to close the fuel passage and unseats from the valve seat to open the fuel passage. Diameter of the inner circumferential surface decreases as approaching to a downstream side. The nozzle hole of the nozzle hole plate is formed so that length of radial outside of the nozzle hole with respect to a shaft center of the fuel injection valve is smaller than that of radial inside of the nozzle hole.

Abstract: A fuel injection valve for reducing carbon deposit on a passage portion between a seat portion and an injection port. The fuel injection valve includes an injection port 13 for injecting a fuel that is arranged to face a combustion chamber of an internal combustion engine. A seat portion H, where a valve element 8 comes in contact with a face of a valve seat 11 to intermit fuel injection, is arranged at a place upstream the injection port 13. The valve element 8 is conical at a portion downstream the seat portion H to an inlet of the injection port 13. The sectional area of the passage between the valve element 8 and the face of the valve seat 11 at the time of fully opening the valve element 8 is arranged so that the sectional area of the passage downstream of the vicinity of the seat portion H is larger. A tapered face 17 having a bore not more than 1/2.5 of an inner diameter of a swirl chamber 16 of a swirler 10 is formed on the face of the valve seat 11 which is downstream the seat portion H.

Abstract: A fuel injection valve capable of eliminating pressure loss at the upstream portion of swing grooves while speeding heat radiation from a swing body is provided. Most of an outer circumferential part of the swing body 13 for applying swing to fuel is in a full circumference engagement with an inner circumferential surface of a valve body 9 and further, the upstream portion of the swing grooves 20 is constructed by a doughnut-shaped common passage 13d.

Abstract: A fuel injection valve including an orifice plate having a plurality of injection orifices, a valve seat in the upstream section of the injection orifices and has a cylindrical fuel flow path formed therein, a fuel cavity formed between the fuel flow path and the orifice plate directly above the injection orifices, and a valve member supported for its reciprocations to settle in and lift off the valve seat. The relationships among dimensions are &phgr;D1+&phgr;d<&phgr;P and t<&phgr;d, where &phgr;D1 is the diameter of the fuel flow path, &phgr;d the diameter of the injection orifices, &phgr;P the diameter of a pitch circle with its center coinciding with the axis of the fuel flow path, and t the depth in the axial direction of the fuel cavity.

Abstract: A fuel injection system capable of improving the degree of atomization and the combustibility of a fuel, including a fuel swirler, a valve seat having a fuel injection port, an annular fuel swirl chamber formed between the fuel swirler and a valve seat and communicating with plural swirl grooves and a fuel injection port, and a valve body adapted to be moved forward and backward in the interior of the fuel swirler in the axial direction thereof and thereby disengaged from and engaged with the valve seat to open and close a communication passage between the fuel swirl chamber and fuel injection port. Let S1, S2 and S3 equal a minimum cross-sectional area of an opening between the valve body and valve seat in the condition in which the communication passage is fully opened, an area of a cross section of the fuel injection port which is perpendicular to the axis thereof, and an average cross-sectional area of a fuel flow in the fuel injection port, respectively.

Abstract: A fuel injection valve includes an orifice plate having a plurality of discharge orifices formed therein. A valve seat is disposed upstream of the discharge orifices and has a cylindrical fuel passage formed therein. A fuel cavity is formed between the cylindrical fuel passage and the orifice plate directly above the discharge orifices. A valve member is supported for reciprocating movement into and out of contact with the valve seat. The fuel injection valve satisfies the inequalities &phgr;D1+&phgr;d<&phgr;P and t<&phgr;d wherein &phgr;D1 is the diameter of the cylindrical fuel passage, &phgr;d is the diameter of each discharge orifice, &phgr;P is the diameter of an imaginary circle passing through the center of each discharge orifice, and t is the depth in the axial direction of the fuel cavity.