EP2660460B1 - Electronically controlled fuel injection valve - Google Patents
Electronically controlled fuel injection valve Download PDFInfo
- Publication number
- EP2660460B1 EP2660460B1 EP11852720.9A EP11852720A EP2660460B1 EP 2660460 B1 EP2660460 B1 EP 2660460B1 EP 11852720 A EP11852720 A EP 11852720A EP 2660460 B1 EP2660460 B1 EP 2660460B1
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- European Patent Office
- Prior art keywords
- fuel
- pressure chamber
- cutoff
- needle
- control
- Prior art date
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- 239000000446 fuel Substances 0.000 title claims description 325
- 238000002347 injection Methods 0.000 title claims description 139
- 239000007924 injection Substances 0.000 title claims description 139
- 238000003825 pressing Methods 0.000 claims description 21
- 238000003780 insertion Methods 0.000 claims description 8
- 230000037431 insertion Effects 0.000 claims description 8
- 238000003754 machining Methods 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/04—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure using fluid, other than fuel, for injection-valve actuation
- F02M47/046—Fluid pressure acting on injection-valve in the period of injection to open it
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/06—Other fuel injectors peculiar thereto
Definitions
- the present invention provides an electronically controlled fuel injection valve that includes: a valve body having defined therein a first flow path along which fuel is fed through a fuel supply port, the valve body having a control valve housing in an upper portion thereof; a nozzle part coupled to a lower portion of the valve body, the nozzle part having defined therein a nozzle chamber which is filled with fuel that is supplied via the first flow path so that a needle disposed therein is pressed upward, whereby the needle is lifted up so that fuel is injected toward a nozzle hole; an injection controller disposed inside the valve body so as to be able to open and close the first flow path in order to control the nozzle part to inject fuel; a nozzle pressing part positioned below the injection controller, the nozzle pressing part applying a downward force to the needle of the nozzle part; an upper pressure chamber formed above the injection controller, the upper pressure chamber creating a pressure when the upper pressure chamber is filled with fuel injected through the fuel supply port, the pressure moving the injection controller downward; a lower pressure chamber positioned below
- the simplified structure facilitates replacement of parts. Since the spindle and the piston are separately fabricated such that surfaces which require precision machining are minimized, it is possible to facilitate precision machining of parts, thereby reducing fabrication cost. It is easy to machine the second flow path by placing the second flow path within the control valve housing. Since the surfaces that require precision machining are minimized, it is possible to facilitate precision machining of parts, thereby reducing fabrication cost.
- the cutoff needle 330 of the cutoff part 310 is lifted up, thereby opening the first flow path 220, whereby high-pressure fuel is delivered to the chamber 411 defined above the needle spindle 410 and to the nozzle chamber 510 of the nozzle part 500.
- the control needle 240 is disposed within the control valve housing 241, and opens and closes the second flow path 221 in response to a control signal, thereby controlling the flow rate of fuel that is supplied to the lower pressure chamber 231.
- the control chamber 233 is formed in the valve body 200 so as to be connected to the lower pressure chamber 231, such that it is filled with fuel from the lower pressure chamber 231 when fuel is discharged.
- the control orifice 234 is connected to the control chamber 233, and allows fuel inside the control chamber 233 to be discharged out of the valve body 200.
- the second flow path is formed in the control valve housing 241 as above, the structure of the second flow path 221 is simplified, and the second flow path 221 can be more easily machined than in the case where the flow path is formed in the valve body 200.
- the force for lifting up the spindle 320 and the cutoff needle 330 caused by the pressure of fuel that fills the cutoff pressure chamber 232 becomes smaller than the total of the force acting on the upper portion of the spindle 320 caused by the pressure of fuel that fills the upper pressure chamber 230 and the force from the spring 340 for pressing the cutoff needle 330.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
- The present invention relates, in general, to an electronically controlled fuel injection valve and, more particularly, to an electronically controlled fuel injection valve which can independently control the time to inject fuel and the amount of fuel to be injected in response to a control signal sent from the operating condition of an engine, and when fuel is not injected, prevent a nozzle part from being constantly subjected to high pressure due to the nozzle part being not supplied with fuel.
- In response to the development of electronic control technologies, it is the rapidly-growing trend to electronically control engines. Fuel injection methods using a common rail are being widely applied to electronically controlled engines since fuel injection can be performed under high pressure even with a low load and can be easily performed in response to a control signal (see
WO 01/53688 A JP 2000 08 7821 A - A variety of research and development is being performed on electronically controlled fuel injection valves that are key devices of common rail fuel injection systems. In order to improve the performance of the fuel injection valve, a large number of patent applications are being filed for various types of fuel injection valve driving mechanisms.
- A traditional mechanical fuel injection valve is configured such that fuel is injected by lifting up a needle using only the pressure of fuel that is fed into a chamber of a nozzle part. Since injection characteristics such as the time to inject fuel and the amount of fuel to be injected are always uniform, control over fuel injection cannot be performed independently from the operating condition of an engine and this can be problematic.
- In addition, in the case of a traditional electronically controlled fuel injection valve, fuel is constantly supplied to the nozzle part through a fuel supply port and the nozzle part is constantly subjected to high pressure. Consequently, a large amount of fuel leaks into the combustion chamber when accidents, such as damage to the needle of the nozzle or to a valve seat, occur.
- Accordingly, the present invention has been made keeping in mind the above problems occurring in the related art, and is intended to provide an electronically controlled fuel injection valve which can control the time to inject fuel and the amount of fuel to be injected in response to a control signal sent independently from the operating condition of an engine unlike a traditional mechanical fuel injection valve, and which employs a control method for fuel injection that increases the force of lifting up a cutoff needle of an injection controller by delivering high-pressure fuel to a lower pressure chamber via a control needle, thereby rapidly controlling fuel injection. This invention prevents a nozzle part from being constantly subjected to high pressure due to the nozzle part being not supplied with fuel when fuel is not injected, prevents a large amount of fuel from leaking into a combustion chamber when a part such as a needle is damaged, and simplifies the structure of a second flow path, thereby facilitating fabrication.
- In order to accomplish the above objects, the present invention provides an electronically controlled fuel injection valve that includes: a valve body having defined therein a first flow path along which fuel is fed through a fuel supply port, the valve body having a control valve housing in an upper portion thereof; a nozzle part coupled to a lower portion of the valve body, the nozzle part having defined therein a nozzle chamber which is filled with fuel that is supplied via the first flow path so that a needle disposed therein is pressed upward, whereby the needle is lifted up so that fuel is injected toward a nozzle hole; an injection controller disposed inside the valve body so as to be able to open and close the first flow path in order to control the nozzle part to inject fuel; a nozzle pressing part positioned below the injection controller, the nozzle pressing part applying a downward force to the needle of the nozzle part; an upper pressure chamber formed above the injection controller, the upper pressure chamber creating a pressure when the upper pressure chamber is filled with fuel injected through the fuel supply port, the pressure moving the injection controller downward; a lower pressure chamber positioned below the upper pressure chamber, the lower pressure chamber creating a pressure when the lower pressure chamber is filled up with fuel, the pressure lifting up the injection controller; a cutoff pressure chamber positioned below the lower pressure chamber, the cutoff pressure chamber creating a pressure when the cutoff pressure chamber is filled with fuel that flows through the first flow path, the pressure lifting up the injection controller; a second flow path formed in the valve body via the control valve housing, the second flow path being connected to the lower pressure chamber, thereby allowing fuel to be supplied to the lower pressure chamber; a control needle disposed within the control valve housing, the control needle opening and closing the second flow path in response to a control signal, thereby controlling a flow rate of fuel that is supplied to the lower pressure chamber; a control chamber formed in the valve body so as to be connected to the lower pressure chamber, such that the control chamber is filled with fuel from the lower pressure chamber when fuel is discharged; and a control orifice connected to the control chamber, and the control orifice allowing fuel inside the control chamber to be discharged out of the valve body.
- In addition, the injection controller may include: a cutoff part disposed at a center of the valve body, the cutoff part being lifted up by a force under a pressure of fuel that fills the lower pressure chamber and the cutoff pressure chamber so as to open and close the first flow path, thereby controlling supply of fuel to the nozzle part; a pressure piston disposed above the cutoff part, the pressure piston applying a downward force to the cutoff part under a pressure of fuel that fills the upper pressure chamber; and a spring disposed and inserted into the pressure piston, the spring applying a downward force to the cutoff part.
- Furthermore, the cutoff part may include: a spindle forced in an upward direction under the pressure of fuel that fills the lower pressure chamber; and a cutoff needle disposed under the spindle so as to be separate from the spindle, wherein the cutoff needle is forced in an upward direction under a pressure of fuel that fills the cutoff pressure chamber, and when actuated upward together with the spindle, opens the first flow path.
- In order to accomplish the above objects, the present invention also provides an electronically controlled fuel injection valve that includes: a valve body having defined therein a first flow path along which fuel is fed through a fuel supply port, the valve body having a control valve housing in an upper portion thereof; a nozzle part coupled to a lower portion of the valve body, the nozzle part having defined therein a nozzle chamber which is filled with fuel that is supplied via the first flow path so that a needle disposed therein is pressed upward, whereby the needle is lifted up so that fuel is injected toward a nozzle hole; an injection controller disposed inside the valve body so as to be able to open and close the first flow path in order to control the nozzle part to inject fuel; a nozzle pressing part positioned below the injection controller, the nozzle pressing part applying a downward force to the needle of the nozzle part; an upper pressure chamber formed above the injection controller, the upper pressure chamber creating a pressure when the upper pressure chamber is filled with fuel injected through the fuel supply port, the pressure moving the injection controller downward; a lower pressure chamber positioned below the upper pressure chamber, the lower pressure chamber creating a pressure when the lower pressure chamber is filled up with fuel, the pressure lifting up the injection controller; a cutoff pressure chamber positioned below the lower pressure chamber, the cutoff pressure chamber creating a pressure when the cutoff pressure chamber is filled with fuel that flows through the first flow path, the pressure lifting up the injection controller; a second flow path formed inside the injection controller via the control valve housing, the second flow path being connected to the lower pressure chamber, thereby allowing fuel to be supplied to the lower pressure chamber; a control needle disposed within the control valve housing, the control needle opening and closing the second flow path in response to a control signal, thereby controlling a flow rate of fuel that is supplied to the lower pressure chamber; a control chamber formed in the valve body so as to be connected to the lower pressure chamber, such that the control chamber is filled with fuel from the lower pressure chamber when fuel is discharged; and a control orifice connected to the control chamber, and the control orifice allowing fuel inside the control chamber to be discharged out of the valve body.
- In addition, the injection controller may include: a cutoff part disposed so as to be fitted into the control valve housing, the cutoff part being positioned below the upper pressure chamber, and being lifted up by a force caused by a pressure of fuel that fills the lower pressure chamber and the cutoff pressure chamber, thereby opening and closing the cutoff part; and a spring disposed so as to be fitted into the cutoff part, the spring applying a downward force to the cutoff part.
- Furthermore, the cutoff part may include: a spindle having an insertion hole into which the control valve housing is insertable and a plurality of connection holes inside the insertion hole, the connecting holes being connected to the lower pressure chamber such that the second flow path formed in the control valve housing is connectable to the lower pressure chamber, the spindle being forced in an upward direction under a pressure of fuel that fills the lower pressure chamber; and a cutoff needle disposed under the spindle so as to be separate from the spindle, wherein the cutoff needle is forced in an upward direction under a pressure of fuel that fills the cutoff pressure chamber, and when actuated upward together with the spindle, opens the first flow path.
- In addition, the valve body may further have a fuel drain hole which prevents fuel in the cutoff pressure chamber from leaking to the lower pressure chamber through an interval between the outer circumference of the cutoff needle and the inner circumference of the valve body so that a pressure of leaking fuel does not additionally act on the spindle.
- Furthermore, the nozzle pressing part may include: a needle spindle having a concave chamber in an upper portion thereof which can be filled with fuel when the first flow path is opened by the injection controller, the needle spindle being disposed above the needle, and applying a downward force to the needle under a pressure of fuel; and a nozzle spring disposed above the needle spindle, the nozzle spring applying a downward force to the needle spindle.
- As described above, the present invention has the following merits. It is possible to control the time to inject fuel and the amount of fuel to be injected in response to a control signal sent independently from the operating condition of an engine, which is unlike a traditional mechanical fuel injection valve. A control method for fuel injection increases the force of lifting up a cutoff needle of an injection controller by delivering high-pressure fuel to a lower pressure chamber via a control needle, thereby rapidly controlling fuel injection.
- In addition, the simplified structure facilitates replacement of parts. Since the spindle and the piston are separately fabricated such that surfaces which require precision machining are minimized, it is possible to facilitate precision machining of parts, thereby reducing fabrication cost. It is easy to machine the second flow path by placing the second flow path within the control valve housing. Since the surfaces that require precision machining are minimized, it is possible to facilitate precision machining of parts, thereby reducing fabrication cost.
- Furthermore, when fuel is not being injected, the cutoff needle prevents the nozzle part from being constantly subjected to high pressure by cutting off fuel delivery to the nozzle part. This prevents a large amount of fuel from leaking into the combustion chamber when any part malfunctions or is damaged, thereby creating a safer mechanism. It is easy to reduce the size of the spring which presses down the needle of the nozzle part or to increase the pressure at which the nozzle part is opened or closed.
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FIG. 1 is an example view showing a fuel injection valve according to a first embodiment of the present invention; -
FIG. 2 is an example view specifically showing the installation structure of the control needle of the fuel injection valve according to the first embodiment of the present invention; -
FIG. 3 is an example view specifically showing the structure of the spindle and the lower pressure chamber of the fuel injection valve according to the first embodiment of the present invention; -
FIG. 4 is an example view showing the fuel drain hole which is formed in the contact area between the spindle and the cutoff needle of the cutoff part according to the first embodiment of the present invention; -
FIG. 5 is an example view showing the operating state and the flow of fuel when fuel is not injected in response to closing of the control needle of the fuel injection valve according to the first embodiment of the present invention; -
FIG. 6 is an example view showing the operating state and the flow of fuel when fuel is injected in response to opening of the control needle of the fuel injection valve according to the first embodiment of the present invention; -
FIG. 7 is an example view showing the operating state and the flow of fuel when fuel injection is completed in response to re-closing of the control needle of the fuel injection valve according to the first embodiment of the present invention; -
FIG. 8 is an example view showing a fuel injection valve according to a second embodiment of the present invention; -
FIG. 9 is an example view specifically showing the installation structure of the control needle of the fuel injection valve according to the second embodiment of the present invention; -
FIG. 10 is an example view specifically showing the structure of the spindle and the lower pressure chamber of the fuel injection valve according to the second embodiment of the present invention; -
FIG. 11 is an example view showing the fuel drain hole which is formed in the contact area between the spindle and the cutoff needle of the cutoff part according to the second embodiment of the present invention; -
FIG. 12 is an example view showing the operating state and the flow of fuel when fuel is not injected in response to closing of the control needle of the fuel injection valve according to the second embodiment of the present invention; -
FIG. 13 is an example view showing the operating state and the flow of fuel when fuel is injected in response to opening of the control needle of the fuel injection valve according to the second embodiment of the present invention; and -
FIG. 14 is an example view showing the operating state and the flow of fuel when fuel injection is completed in response to re-closing of the control needle of the fuel injection valve according to the second embodiment of the present invention. - Reference will now be made in detail to embodiments of the present invention and their functions in conjunction with the accompanying drawings. In the following description of the present invention, detailed descriptions of known functions and components incorporated herein will be omitted when they may make the subject matter of the present invention unclear.
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FIG. 1 is an example view showing a fuel injection valve according to a first embodiment of the present invention,FIG. 2 is an example view specifically showing the installation structure of the control needle of the fuel injection valve according to the first embodiment of the present invention,FIG. 3 is an example view specifically showing the structure of the spindle and the lower pressure chamber of the fuel injection valve according to the first embodiment of the present invention,FIG. 4 is an example view showing the fuel drain hole which is formed in the contact area between the spindle and the cutoff needle of the cutoff part according to the first embodiment of the present invention,FIG. 5 is an example view showing the operating state and the flow of fuel when fuel is not injected in response to closing of the control needle of the fuel injection valve according to the first embodiment of the present invention,FIG. 6 is an example view showing the operating state and the flow of fuel when fuel is injected in response to opening of the control needle of the fuel injection valve according to the first embodiment of the present invention, andFIG. 7 is an example view showing the operating state and the flow of fuel when fuel injection is completed in response to re-closing of the control needle of the fuel injection valve according to the first embodiment of the present invention. - As shown in the figures, according to the present invention, the
fuel injection valve 100 includes avalve body 200, anozzle part 500, aninjection controller 300, anozzle pressing part 400, anupper pressure chamber 230, alower pressure chamber 231, acutoff pressure chamber 232, asecond flow path 221, acontrol needle 240, acontrol chamber 233 and acontrol orifice 234. Thevalve body 200 has defined therein afirst flow path 220 along which fuel is fed through afuel supply port 210, and has acontrol valve housing 241 in the upper portion thereof. Thenozzle part 500 is coupled to the lower portion of thevalve body 200, and has defined therein anozzle chamber 510 which is filled with fuel that is supplied via thefirst flow path 220 so that aneedle 520 disposed therein is pressed upward, whereby theneedle 520 is lifted up so that fuel is injected toward anozzle hole 530. Theinjection controller 300 is disposed inside thevalve body 200 such that it can open and close thefirst flow path 220 in order to control thenozzle part 500 to inject fuel. Thenozzle pressing part 400 is disposed inside thevalve body 200, is positioned below theinjection controller 300, and applies a downward force to theneedle 520 of thenozzle part 500. Theupper pressure chamber 230 is formed above theinjection controller 300, and creates a pressure when it is filled with fuel fed through thefuel supply port 210, the pressure moving theinjection controller 300 downward. Thelower pressure chamber 231 is positioned below theupper pressure chamber 230, and creates a pressure when it is filled up with fuel, the pressure lifting up theinjection controller 300. Thecutoff pressure chamber 232 is positioned below thelower pressure chamber 231, and creates a pressure when it is filled with fuel that flows through thefirst flow path 220, the pressure lifting up theinjection controller 300. Thesecond flow path 221 is formed in thevalve body 200 via thecontrol valve housing 241, and is connected to thelower pressure chamber 231. Theinjection controller 300 allows fuel to be supplied to thelower pressure chamber 231. Thecontrol needle 240 is disposed within thecontrol valve housing 241, and opens and closes thesecond flow path 221 in response to a control signal, thereby controlling the flow rate of fuel that is supplied to thelower pressure chamber 231. Thecontrol chamber 233 is formed in thevalve body 200 so as to be connected to thelower pressure chamber 231, such that it is filled with fuel from thelower pressure chamber 231 when fuel is discharged. Thecontrol orifice 234 is connected to thecontrol chamber 233, and allows fuel inside thecontrol chamber 233 to be discharged out of thevalve body 200. - The
control needle 240 is configured such that it can be actuated by an actuator (not shown) which operates in response to a control signal so as to open and close thesecond flow path 221, thereby controlling the flow rate of fuel that flows into thelower pressure chamber 231. - The
injection controller 300 includes acutoff part 310, apressure piston 350 and aspring 340. Thecutoff part 310 is disposed at the center of thevalve body 200, and can be lifted up by a force under the pressure of fuel that fills thelower pressure chamber 231 and thecutoff pressure chamber 232 so as to open and close thefirst flow path 220, thereby controlling the supply of fuel to thenozzle part 500. Thepressure piston 310 is disposed above thecutoff part 310, and applies a downward force to thecutoff part 310 under the pressure of fuel that fills theupper pressure chamber 230. Thespring 340 is disposed such that it is inserted into thepressure piston 350, and applies a downward force to thecutoff part 310. - In the first embodiment of the present invention, since the
cutoff part 310 and thepressure piston 350 are separate, it is easy to adjust the intervals from the outer circumferences of thepressure piston 350 and thecutoff part 310 which require precision machining to the inner circumference of the inner space of thevalve body 200 in which they are disposed, thereby facilitating the fabrication of the valve and reducing fabrication cost. - That is, the intervals from the outer circumferences of the
pressure piston 350 and thecutoff part 310 to the inner circumference of the inner space of thevalve body 200 must be precisely machined to a very small size in order to prevent high-pressure fuel, that fills the inside of theupper pressure chamber 230 and thelower pressure chamber 231, from leaking through the interval. When thecutoff part 310 and the pressure piston are formed integrally, machining is difficult since one part has a large number of surfaces that must be precisely machined. In contrast, the first embodiment of the present invention is designed such that the surfaces of each part that require precision machining are minimized by separately configuring thecutoff part 310 and thepressure piston 350. This consequently leads to an advantage in that it becomes easy to precisely machine the parts. - In the meantime, the
cutoff part 310 includes aspindle 320 which is forced in the upward direction under the pressure of fuel that fills thelower pressure chamber 231 and acutoff needle 330 which is disposed under thespindle 320 so as to be separate from thespindle 320. Thecutoff needle 330 is forced in the upward direction under the pressure of fuel that fills thecutoff pressure chamber 232, and when actuated upward together with thespindle 320, opens thefirst flow path 220. - Since the
cutoff part 310 is configured such that thespindle 320 and thecutoff needle 330 are separate from each other, the surfaces of each part that require precision machining are designed to be minimized as in the case in which thecutoff part 310 and thepressure piston 350 are configured separate from each other, thereby leading to a design advantage of facilitating precise machining of the parts. - In the meantime, the
control chamber 233 and thecontrol orifice 234 are formed such that they are connected to thelower pressure chamber 231 to discharge fuel inside thelower pressure chamber 231 out of thevalve body 200 when the spindle is actuated in the upward direction. In contrast, when thespindle 320 is not actuated, thecontrol chamber 233 and thecontrol orifice 234 are disconnected from thelower pressure chamber 231 so that fuel is not discharged. - In addition, the
valve body 200 also has afuel drain hole 235 which prevents fuel in thecutoff pressure chamber 232 from leaking to thelower pressure chamber 231 through the interval between the outer circumference of thecutoff needle 330 and the inner circumference of thevalve body 200 so that the pressure of leaking fuel does not additionally act on thespindle 320. - The
fuel drain hole 235 is formed such that it is positioned at a contact area between thespindle 320 and thecutoff needle 330, whereby fuel can more easily drain from thecutoff pressure chamber 232. - In addition, the
nozzle pressing part 400 includes aneedle spindle 410 and anozzle spring 420. Theneedle spindle 410 has aconcave chamber 411 in the upper portion thereof which can be filled with fuel when thefirst flow path 220 is opened by thecutoff part 310 of theinjection controller 300. Theneedle spindle 410 is disposed above theneedle 520, and applies a downward force to theneedle 520 under the pressure of fuel. Thenozzle spring 420 is disposed above theneedle spindle 410, and applies a downward force to theneedle spindle 410. - In addition,
pressure acting surfaces 333 having a stepped shape are formed on thespindle 320 and thecutoff needle 330 such that a driving force can act in the upward direction in response to the pressure of fuel that fills thelower pressure chamber 231 and thecutoff pressure chamber 232. - A description will be given of the operating state of the fuel injection valve having the above-described configuration according to the first embodiment of the present invention.
- First, when fuel is not injected, high-pressure fuel supplied through the
fuel supply port 210 fills thecutoff pressure chamber 232 through theupper pressure chamber 230 which is formed above theinjection controller 300, i.e. above thepressure piston 350, and thefirst flow path 220. - During the standby period in which fuel is not injected as such, fuel is not delivered to the
lower pressure chamber 231 through thesecond flow path 221, since thecontrol needle 240 stays closing thesecond flow path 221. - Accordingly, the
cutoff part 310 stays closed since the total of a force that acts in the downward direction on the upper portion of thepressure piston 350, which is under the pressure of fuel that has filled theupper pressure chamber 230, and a force from thespring 340 that acts in the downward direction is greater than a force that acts in the upward direction on thecutoff part 310 through thecutoff pressure chamber 232. - As the
first flow path 220 is closed by thecutoff part 310 in this way, and high-pressure fuel is not delivered to thenozzle part 500, theneedle 520 also stays closed under the force of thenozzle spring 420 that acts in the downward direction, whereby fuel is not injected through thenozzle hole 530. - When starting fuel injection, as the actuator operates in response to a control signal to lift up the
control needle 240, thesecond flow path 221 which has been closed by thecontrol needle 240 is opened, thereby allowing high-pressure fuel to be delivered to thelower pressure chamber 231. The pressure of fuel that fills thelower pressure chamber 231 acts on thepressure acting surface 333 formed on thespindle 320 of thecutoff part 310. - Accordingly, as the force caused by the pressure of fuel that acts in the upward direction on the
spindle 320 and thecutoff needle 330 of thecutoff part 310 becomes greater than the total of the force that acts on the upper portion of thepressure piston 350 under the pressure of fuel that has filled theupper pressure chamber 230 and the force from thespring 340 that acts in the downward direction, thecutoff needle 330 is lifted up, thereby opening thefirst flow path 220, whereby high-pressure fuel is delivered to thechamber 411 defined above theneedle spindle 410 and to thenozzle chamber 510 of thenozzle part 500. - When the force that lifts up the needle of the
nozzle part 500, under the pressure of fuel that has been delivered to thenozzle chamber 510, exceeds the total of the force acting in the downward direction that is caused by fuel that has filled thechamber 411 in the upper portion of theneedle spindle 410 and the force acting in the downward direction on theneedle spindle 410 that is caused by thenozzle spring 420, theneedle 520 of thenozzle part 500 is lifted up, and fuel is injected through thenozzle hole 530. - Here, the pressure of opening the nozzle is determined by the force acting on the upper portion of the
needle spindle 410 caused by the pressure of fuel that fills thechamber 411 formed in the upper portion of theneedle spindle 410 and the force of thenozzle spring 420. In this case, it is possible to reduce the load of thenozzle spring 420 more than in the case of pressing theneedle 520 of thenozzle part 500 using only thenozzle spring 420. Accordingly, it is easy to reduce the size of thenozzle spring 420 or increase the pressure for opening thenozzle part 500. - When completing fuel injection, the
control needle 240 moves downward in response to a control signal, thereby closing thesecond path 221. - When the
second flow path 221 is closed as such, fuel is no longer supplied to thelower pressure chamber 231 but is discharged throughcontrol orifice 234 so that the pressure inside thelower pressure chamber 231 decreases. - Consequently, the force for lifting up the
spindle 320 and thecutoff needle 330, caused by the pressure of fuel that fills thecutoff pressure chamber 232, becomes smaller than the total of the force acting on the upper portion of thepressure piston 350 caused by the pressure of fuel that fills theupper pressure chamber 230 and the force from thespring 340 for pressing thecutoff needle 330. - Consequently, the
cutoff needle 330 moves down to close thefirst flow path 220, so that high-pressure fuel is no longer delivered to neither thechamber 411 formed in the upper portion of theneedle spindle 410 nor thenozzle chamber 510 of thenozzle part 500 through thefirst flow path 220. - In addition, after the
cutoff needle 330 is closed as above, fuel that has remained in thefirst flow path 220 is injected toward thenozzle hole 530 of thenozzle part 500. This consequently decreases the pressure in thenozzle chamber 510, thereby decreasing the force needed for lifting up theneedle 520 of thenozzle part 500. When this force becomes smaller than the total of the force acting on the upper portion of theneedle spindle 410 caused by fuel that has filled thechamber 411 in the upper portion of theneedle spindle 410 and the force caused by thenozzle spring 420, theneedle 520 of thenozzle part 500 moves downward to close the flow path to thenozzle hole 530, thereby completing fuel injection. - In the fuel injection valve according to the first embodiment of the present invention as described above, the
control needle 240 can operate in response to a control signal to control the time to inject fuel and the amount of fuel to be injected independently from the operating condition of an engine, unlike the traditional mechanical fuel injection valve. - In addition, since a control method for fuel injection increases the force of lifting up the
cutoff needle 330 of theinjection controller 300 by delivering high-pressure fuel to thelower pressure chamber 231 via thecontrol needle 240, control over fuel injection is rapid. - Furthermore, parts can be easily assembled and replaced due to the simple structure. In particular, there is an advantage in the design in that the
nozzle part 500 can be easily replaced. - In addition, there is a safety function of closing the
cutoff needle 330 to cut off thefirst flow path 220 so that fuel is not delivered to thenozzle part 500, thereby preventing the nozzle part 550 from being under constant high pressure when fuel injection is not being injected. This function also prevents a large amount of fuel from leaking into a combustion chamber when accidents, such as damage to theneedle 520 of thenozzle part 500 or to a valve seat, occur. - Furthermore, since the pressure at which the
nozzle part 500 is opened is determined by the force caused by the pressure acting on the upper portion of theneedle spindle 410 and the force from thenozzle spring 420, the force of thenozzle spring 420 can be reduced more than in the case in which theneedle 520 of thenozzle part 500 is pressed using only thenozzle spring 420, thereby leading to a design advantage in that the size of thenozzle spring 420 can be reduced. It is also easy to increase the pressure at which thenozzle part 500 is opened or closed. -
FIG. 8 is an example view showing a fuel injection valve according to a second embodiment of the present invention,FIG. 9 is an example view specifically showing the installation structure of the control needle of the fuel injection valve according to the second embodiment of the present invention,FIG. 10 is an example view specifically showing the structure of the spindle and the lower pressure chamber of the fuel injection valve according to the second embodiment of the present invention,FIG. 11 is an example view showing the fuel drain hole which is formed in the contact area between the spindle and the cutoff needle of the cutoff part according to the second embodiment of the present invention,FIG. 12 is an example view showing the operating state and the flow of fuel when fuel is not injected in response to closing of the control needle of the fuel injection valve according to the second embodiment of the present invention,FIG. 13 is an example view showing the operating state and the flow of fuel when fuel is injected in response to opening of the control needle of the fuel injection valve according to the second embodiment of the present invention, andFIG. 14 is an example view showing the operating state and the flow of fuel when fuel injection is completed in response to re-closing of the control needle of the fuel injection valve according to the second embodiment of the present invention. - As shown in the figures, according to the second embodiment of the present invention, the
fuel injection valve 100 includes avalve body 200, anozzle part 500, aninjection controller 300, anozzle pressing part 400, anupper pressure chamber 230, alower pressure chamber 231, acutoff pressure chamber 232, asecond flow path 221, acontrol needle 240, acontrol chamber 233 and acontrol orifice 234. Thevalve body 200 has defined therein afirst flow path 220 along which fuel is fed through afuel supply port 210, and has acontrol valve housing 241 in the upper portion thereof. Thenozzle part 500 is coupled to the lower portion of thevalve body 200, and has defined therein anozzle chamber 510 which is filled with fuel that is supplied via thefirst flow path 220 so that aneedle 520 disposed therein is pressed upward, whereby theneedle 520 is lifted up so that fuel is injected toward anozzle hole 530. Theinjection controller 300 is disposed inside thevalve body 200 such that it can open and close thefirst flow path 220 in order to control thenozzle part 500 to inject fuel. Thenozzle pressing part 400 is disposed inside thevalve body 200, is positioned below theinjection controller 300, and applies a downward force to theneedle 520 of thenozzle part 500. Theupper pressure chamber 230 is formed above theinjection controller 300, and creates a pressure when it is filled with fuel fed through thefuel supply port 210, the pressure moving theinjection controller 300 downward. Thelower pressure chamber 231 is positioned below theupper pressure chamber 230, and creates a pressure when it is filled up with fuel, the pressure lifting up theinjection controller 300. Thecutoff pressure chamber 232 is positioned below thelower pressure chamber 231, and creates a pressure when it is filled with fuel that flows through thefirst flow path 220, the pressure lifting up theinjection controller 300. Thesecond flow path 221 is formed inside theinjection controller 300 via thecontrol valve housing 241, and is connected to thelower pressure chamber 231. Theinjection controller 300 allows fuel to be supplied to thelower pressure chamber 231. Thecontrol needle 240 is disposed within thecontrol valve housing 241, and opens and closes thesecond flow path 221 in response to a control signal, thereby controlling the flow rate of fuel that is supplied to thelower pressure chamber 231. Thecontrol chamber 233 is formed in thevalve body 200 so as to be connected to thelower pressure chamber 231, such that it is filled with fuel from thelower pressure chamber 231 when fuel is discharged. Thecontrol orifice 234 is connected to thecontrol chamber 233, and allows fuel inside thecontrol chamber 233 to be discharged out of thevalve body 200. - The
control needle 240 is configured such that it can be actuated by an actuator (not shown) which operates in response to a control signal so as to open and close thesecond flow path 221, thereby controlling the flow rate of fuel that flows into thelower pressure chamber 231. - The
injection controller 300 includes acutoff part 310 and aspring 340. Thecutoff part 310 is disposed such that it is fitted into thecontrol valve housing 241, and is positioned below theupper pressure chamber 230. Thecutoff part 310 is lifted up by a force caused by the pressure of fuel that fills thelower pressure chamber 231 and thecutoff pressure chamber 232, thereby opening and closing thecutoff part 310. Thespring 340 is disposed such that it is fitted into thecutoff part 310, and applies a downward force to thecutoff part 310. - The
cutoff part 310 includes aspindle 320 and acutoff needle 330. Thespindle 320 has aninsertion hole 321 into which thecontrol valve housing 241 can be inserted and a plurality of connection holes 322 inside theinsertion hole 321, the connectingholes 322 being connected to thelower pressure chamber 231 such that thesecond flow path 221 formed in thecontrol valve housing 241 can be connected to thelower pressure chamber 231. Thespindle 320 is forced in the upward direction under the pressure of fuel that fills thelower pressure chamber 231. Thecutoff needle 330 is disposed under thespindle 320 so as to be separate from thespindle 320. Thecutoff needle 330 is forced in the upward direction under the pressure of fuel that fills thecutoff pressure chamber 232, and when actuated upward together with thespindle 320, opens thefirst flow path 220. - In the second embodiment of the present invention as described above, the
second flow path 221 is formed in thecontrol valve housing 241, and thecontrol valve housing 241 is inserted into theinsertion hole 321 of thespindle 320. Accordingly, thesecond flow path 221 is positioned inside thespindle 320. - Since the second flow path is formed in the
control valve housing 241 as above, the structure of thesecond flow path 221 is simplified, and thesecond flow path 221 can be more easily machined than in the case where the flow path is formed in thevalve body 200. - In addition, since the
spindle 320 and thecutoff needle 330 of thecutoff part 310 are configured separate from each other, it is easy to adjust the intervals from the outer circumferences of thespindle 320 and thecutoff needle 330 which require precision machining to the inner circumference of the inner space of thevalve body 200 in which they are disposed, thereby facilitating the fabrication of the valve and reducing fabrication cost. - That is, the intervals from the outer circumferences of the
pressure piston 350 and thecutoff part 310 to the inner circumference of the inner space of thevalve body 200 must be precisely machined to a very small size in order to prevent high-pressure fuel, that is to be filled inside theupper pressure chamber 230 and thelower pressure chamber 231, from leaking through the interval. When thespindle 320 and thecutoff needle 330 are formed integrally, machining is difficult since one part has a large number of surfaces that must be precisely machined. In contrast, the present invention is designed such that the surfaces of each part that require precision machining are minimized by separately configuring thespindle 320 and thecutoff needle 330. This consequently leads to an advantage of facilitating precise machining of the parts. - In the meantime, the
control chamber 233 and thecontrol orifice 234 are formed such that they are connected to thelower pressure chamber 231 to discharge fuel inside thelower pressure chamber 231 out of thevalve body 200 when the spindle is actuated in the upward direction. In contrast, when thespindle 320 is not actuated, thecontrol chamber 233 and thecontrol orifice 234 are disconnected from thelower pressure chamber 231 so that fuel is not discharged. - In addition, the
valve body 200 also has afuel drain hole 235 which prevents fuel in thecutoff pressure chamber 232 from leaking to thelower pressure chamber 231 through the interval between the outer circumference of thecutoff needle 330 and the inner circumference of thevalve body 200 so that the pressure of leaking fuel does not additionally act on thespindle 320. - The
fuel drain hole 235 is formed such that it is positioned at a contact area between thespindle 320 and thecutoff needle 330, whereby fuel can more easily drain from thecutoff pressure chamber 232. - In addition, the
nozzle pressing part 400 includes aneedle spindle 410 and anozzle spring 420. Theneedle spindle 410 has aconcave chamber 411 in the upper portion thereof which can be filled with fuel when thefirst flow path 220 is opened by thecutoff part 310 of theinjection controller 300. Theneedle spindle 410 is disposed above theneedle 520, and applies a downward force to theneedle 520 under the pressure of fuel. Thenozzle spring 420 is disposed above theneedle spindle 410, and applies a downward force to theneedle spindle 410. - In addition,
pressure acting surfaces 333 having a stepped shape are formed on thespindle 320 and thecutoff needle 330 such that a driving force can act in the upward direction in response to the pressure of fuel that fills thelower pressure chamber 231 and thecutoff pressure chamber 232. - A description will be given of the operating state of the fuel injection valve having the above-described configuration according to the second embodiment of the present invention.
- First, when fuel is not injected, high-pressure fuel supplied through the
fuel supply port 210 fills thecutoff pressure chamber 232 through theupper pressure chamber 230 which is formed above theinjection controller 300, i.e. above thepressure piston 350, and thefirst flow path 220. - During the standby period in which fuel is not injected as such, fuel is not delivered to the
lower pressure chamber 231 through thesecond flow path 221, since thecontrol needle 240 stays closing thesecond flow path 221. - Accordingly, the
cutoff part 310 stays closed since the total of a force that acts in the downward direction on the upper portion of thespindle 320, which is under the pressure of fuel that has filled theupper pressure chamber 230, and a force from thespring 340 that acts in the downward direction is greater than a force that acts in the upward direction on thecutoff part 310 through thecutoff pressure chamber 232. - As the
first flow path 220 is closed by thecutoff part 310 and high-pressure fuel is not delivered to thenozzle part 500, theneedle 520 also stays closed under the force of thenozzle spring 420 that acts in the downward direction, whereby fuel is not injected through thenozzle hole 530. - When starting fuel injection, as the actuator operates in response to a control signal to lift up the
control needle 240, thesecond flow path 221 which has been closed by thecontrol needle 240 is opened, thereby allowing high-pressure fuel to be delivered to thelower pressure chamber 231 through thesecond flow path 221 defined in thecontrol valve housing 241 and through the connection holes 322 inside thespindle 320. The pressure of fuel that fills thelower pressure chamber 231 acts on thepressure acting surface 333 of thespindle 320. - Accordingly, as the force caused by the pressure of fuel that acts in the upward direction on the
spindle 320 and thecutoff needle 330 of thecutoff part 310 through thecutoff chamber 232 and thelower pressure chamber 231 becomes greater than the total of the force that acts on the upper portion of thespindle 320 under the pressure of fuel that has filled theupper pressure chamber 230 and the force from thespring 340 that acts in the downward direction, thecutoff needle 330 is lifted up, thereby opening thefirst flow path 220, whereby high-pressure fuel is delivered to thechamber 411 defined above theneedle spindle 410 and to thenozzle chamber 510 of thenozzle part 500. - When the force that lifts up the
needle 520 of thenozzle part 500 under the pressure of fuel that has been delivered to thenozzle chamber 510 exceeds the total of the force acting in the downward direction that is caused by fuel that has filled thechamber 411 in the upper portion of theneedle spindle 410 and the force acting in the downward direction on theneedle spindle 410 that is caused by thenozzle spring 420, theneedle 520 of thenozzle part 500 is lifted up, and fuel is injected through thenozzle hole 530. - Here, the pressure of opening the nozzle is determined by the force acting on the upper portion of the
needle spindle 410 caused by the pressure of fuel that fills thechamber 411 formed in the upper portion of theneedle spindle 410 and the force of thenozzle spring 420. In this case, it is possible to reduce the load of thenozzle spring 420 than in the case of pressing theneedle 520 of thenozzle part 500 using only thenozzle spring 420. Accordingly, it is easy to reduce the size of thenozzle spring 420 or increase the pressure for opening thenozzle part 500. - When completing fuel injection, the
control needle 240 moves downward in response to a control signal, thereby closing thesecond path 221. - When the
second flow path 221 is closed as such, fuel is no longer supplied to thelower pressure chamber 231 but is discharged throughcontrol orifice 234, so that the pressure inside thelower pressure chamber 231 decreases. - Consequently, the force for lifting up the
spindle 320 and thecutoff needle 330 caused by the pressure of fuel that fills thecutoff pressure chamber 232 becomes smaller than the total of the force acting on the upper portion of thespindle 320 caused by the pressure of fuel that fills theupper pressure chamber 230 and the force from thespring 340 for pressing thecutoff needle 330. - Consequently, the
cutoff needle 330 moves down to close thefirst flow path 220, so that high-pressure fuel is no longer delivered to neither thechamber 411 formed in the upper portion of theneedle spindle 410 nor thenozzle chamber 510 of thenozzle part 500 through thefirst flow path 220. - In addition, after the
cutoff needle 330 is closed as above, fuel that has remained in thefirst flow path 220 is injected toward thenozzle hole 530 of thenozzle part 500. This consequently decreases the pressure in thenozzle chamber 510, thereby decreasing the force needed for lifting up theneedle 520 of thenozzle part 500. When this force becomes smaller than the total of the force acting on the upper portion of theneedle spindle 410 caused by fuel that has filled thechamber 411 in the upper portion of theneedle spindle 410 and the force caused by thenozzle spring 420, theneedle 520 of thenozzle part 500 moves downward to close the flow path to thenozzle hole 530, thereby completing fuel injection. - In the fuel injection valve according to the second embodiment of the present invention as above, the
control needle 240 can operate in response to a control signal to control the time to inject fuel and the amount of fuel to be injected independently from the operating condition of an engine, unlike the traditional mechanical fuel injection valve. - In addition, since the
second flow path 221 is formed through thecontrol valve housing 241, it is easier than forming thesecond flow path 221 in thevalve body 200. This consequently facilitates the fabrication of the valve. - Furthermore, since a control method for fuel injection increases the force of lifting up the
cutoff needle 330 of theinjection controller 300 by delivering high-pressure fuel to thelower pressure chamber 231 via thecontrol needle 240, control over fuel injection is rapid. - In addition, parts can be easily assembled and replaced due to the simple structure. In particular, there is an advantage in the design in that the
nozzle part 500 can be easily replaced. - Furthermore, there is a safety function of closing the
cutoff needle 330 to cut off thefirst flow path 220 so that fuel is not delivered to thenozzle part 500, thereby preventing the nozzle part 550 from being under constant pressure when fuel injection is not being injected. This function also prevents a large amount of fuel from leaking into a combustion chamber when accidents, such as damage to theneedle 520 of thenozzle part 500 or to a valve seat, occur. - In addition, since the pressure at which the
nozzle part 500 is opened is determined by the force caused by the pressure acting on the upper portion of theneedle spindle 410 and the force from thenozzle spring 420, the force of thenozzle spring 420 can be reduced than in the case in which theneedle 520 of thenozzle part 500 is pressed using only thenozzle spring 420, thereby leading to an advantage in that the size of thenozzle spring 420 can be reduced. It is also easy to increase the pressure at which thenozzle part 500 is opened or closed. - Although the present invention has been described hereinabove with respect to the certain exemplary embodiments, it should be understood that the present invention is not limited to the foregoing embodiments. It is apparent to a person having ordinary skill in the art to which the present invention belongs that a variety of changes can be made without departing from the concept of the present invention that is defined in the appended claims, as long as such changes fall within the scope of the claims.
100: | fuel injection valve | 200: | valve body |
210: | fuel supply port | 220: | first flow path |
221: | second flow path | 230: | upper pressure chamber |
231: | lower pressure chamber | ||
232: | cutoff pressure chamber | ||
233: | control chamber | 234: | control orifice |
235: | fuel drain hole | 240: | control needle |
241: | control valve housing | ||
300: | injection controller | ||
310: | cutoff part | 320: | spindle |
321: | insertion hole | 322: | connection hole |
330: | cutoff needle | 333: | pressure acting surface |
340: | spring | 350: | pressure piston |
400: | nozzle pressing part | 410: | needle spindle |
411: | chamber | 420: | nozzle spring |
500: | nozzle part | 510: | nozzle chamber |
520: | needle | 530: | nozzle hole |
Claims (8)
- An electronically controlled fuel injection valve (100) comprising:a valve body (200) having defined therein a first flow path (220) along which fuel is fed through a fuel supply port (210), the valve body having a control valve housing in an upper portion thereof ;a nozzle part (500) coupled to a lower portion of the valve body, the nozzle part having defined therein a nozzle chamber which is filled with fuel that is supplied via the first flow path so that a needle (520) disposed therein is pressed upward, whereby the needle is lifted up so that fuel is injected toward a nozzle hole (530);an injection controller (300) disposed inside the valve body so as to be able to open and close the first flow path in order to control the nozzle part to inject fuel;a nozzle pressing part (400) positioned below the injection controller, the nozzle pressing part applying a downward force to the needle of the nozzle part;an upper pressure chamber (230) formed above the injection controller, the upper pressure chamber creating a pressure when the upper pressure chamber is filled with fuel injected through the fuel supply port, the pressure moving the injection controller downward;a lower pressure chamber (231) positioned below the upper pressure chamber, the lower pressure chamber creating a pressure when the lower pressure chamber is filled up with fuel, the pressure lifting up the injection controller;a cutoff pressure chamber (232) positioned below the lower pressure chamber, the cutoff pressure chamber creating a pressure when the cutoff pressure chamber is filled with fuel that flows through the first flow path, the pressure lifting up the injection controller;a second flow path (221) formed in the valve body via the control valve housing, the second flow path being connected to the lower pressure chamber, thereby allowing fuel to be supplied to the lower pressure chamber;a control needle (240) disposed within the control valve housing, the control needle opening and closing the second flow path in response to a control signal, thereby controlling a flow rate of fuel that is supplied to the lower pressure chamber;a control chamber (238) formed in the valve body so as to be connected to the lower pressure chamber (231), such that the control chamber is filled with fuel from the lower pressure chamber when fuel is discharged; anda control orifice (234) connected to the control chamber, and the control orifice allowing fuel inside the control chamber to be discharged out of the valve body.
- The electronically controlled fuel injection valve according to claim 1, wherein the injection controller comprises:a cutoff part (310) disposed at a center of the valve body, the cutoff part being lifted up by a force under a pressure of fuel that fills the lower pressure chamber (231) and the cutoff pressure chamber (232) so as to open and close the first flow path, thereby controlling supply of fuel to the nozzle part;a pressure piston (350) disposed above the cutoff part, the pressure piston applying a downward force to the cutoff part under a pressure of fuel that fills the upper pressure chamber; anda spring (340) disposed and inserted into the pressure piston, the spring applying a downward force to the cutoff part.
- The electronically controlled fuel injection valve according to claim 2, wherein the cutoff part comprises:a spindle (320) forced in an upward direction under the pressure of fuel that fills the lower pressure chamber; anda cutoff needle (330) disposed under the spindle so as to be separate from the spindle, wherein the cutoff needle is forced in an upward direction under a pressure of fuel that fills the cutoff pressure chamber, and when actuated upward together with the spindle, opens the first flow path.
- An electronically controlled fuel injection valve (100) comprising:a valve body (200) having defined therein a first flow path (220) along which fuel is fed through a fuel supply port (210), the valve body having a control valve housing in an upper portion thereof;a nozzle part (500) coupled to a lower portion of the valve body, the nozzle part having defined therein a nozzle chamber which is filled with fuel that is supplied via the first flow path so that a needle (520) disposed therein is pressed upward, whereby the needle is lifted up so that fuel is injected toward a nozzle hole (530);an injection controller (300) disposed inside the valve body so as to be able to open and close the first flow path in order to control the nozzle part to inject fuel;a nozzle pressing part (400) positioned below the injection controller, the nozzle pressing part applying a downward force to the needle of the nozzle part;an upper pressure chamber (230) formed above the injection controller, the upper pressure chamber creating a pressure when the upper pressure chamber is filled with fuel injected through the fuel supply port, the pressure moving the injection controller downward;a lower pressure chamber (231) positioned below the upper pressure chamber, the lower pressure chamber creating a pressure when the lower pressure chamber is filled up with fuel, the pressure lifting up the injection controller;a cutoff pressure chamber (232) positioned below the lower pressure chamber, the cutoff pressure chamber creating a pressure when the cutoff pressure chamber is filled with fuel that flows through the first flow path, the pressure lifting up the injection controller;a second flow path (221) formed inside the injection controller via the control valve housing, the second flow path being connected to the lower pressure chamber, thereby allowing fuel to be supplied to the lower pressure chamber;a control needle (240) disposed within the control valve housing, the control needle opening and closing the second flow path in response to a control signal, thereby controlling a flow rate of fuel that is supplied to the lower pressure chamber;a control chamber (238) formed in the valve body so as to be connected to the lower pressure chamber (231) such that the control chamber is filled with fuel from the lower pressure chamber when fuel is discharged; anda control orifice (234) connected to the control chamber, and the control orifice allowing fuel inside the control chamber to be discharged out of the valve body.
- The electronically controlled fuel injection valve according to claim 4, wherein the injection controller comprises:a cutoff part (310) disposed so as to be fitted into the control valve housing, the cutoff part being positioned below the upper pressure chamber, and being lifted up by a force caused by a pressure of fuel that fills the lower pressure chamber (231) and the cutoff pressure chamber (232), thereby opening and closing the cutoff part; anda spring (340) disposed so as to be fitted into the cutoff part, the spring applying a downward force to the cutoff part.
- The electronically controlled fuel injection valve according to claim 5, wherein the cutoff part comprises:a spindle having an insertion hole into which the control valve housing (241) is insertable and a plurality of connection holes inside the insertion hole, the connecting holes being connected to the lower pressure chamber such that the second flow path formed in the control valve housing is connectable to the lower pressure chamber, the spindle being forced in an upward direction under a pressure of fuel that fills the lower pressure chamber; anda cutoff needle (330) disposed under the spindle so as to be separate from the spindle, wherein the cutoff needle is forced in an upward direction under a pressure of fuel that fills the cutoff pressure chamber (232) and when actuated upward together with the spindle, opens the first flow path.
- The electronically controlled fuel injection valve according to claim 3 or 6, wherein the valve body further has a fuel drain hole (235) which prevents fuel in the cutoff pressure chamber from leaking to the lower pressure chamber through an interval between the outer circumference of the cutoff needle and the inner circumference of the valve body so that a pressure of leaking fuel does not additionally act on the spindle.
- The electronically controlled fuel injection valve according to claim 1 or 4, wherein the nozzle pressing part comprises:a needle spindle (410) having a concave chamber in an upper portion thereof which can be filled with fuel when the first flow path is opened by the injection controller, the needle spindle being disposed above the needle, and applying a downward force to the needle under a pressure of fuel; anda nozzle spring (420) disposed above the needle spindle, the nozzle spring applying a downward force to the needle spindle.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020100136406A KR101165541B1 (en) | 2010-12-28 | 2010-12-28 | Electronic control fuel injection valve |
KR1020100136404A KR101162883B1 (en) | 2010-12-28 | 2010-12-28 | Electronic control fuel injection valve |
PCT/KR2011/010120 WO2012091393A2 (en) | 2010-12-28 | 2011-12-26 | Electronically controlled fuel injection valve |
Publications (3)
Publication Number | Publication Date |
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EP2660460A2 EP2660460A2 (en) | 2013-11-06 |
EP2660460A4 EP2660460A4 (en) | 2016-05-04 |
EP2660460B1 true EP2660460B1 (en) | 2017-03-08 |
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ID=46383671
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP11852720.9A Active EP2660460B1 (en) | 2010-12-28 | 2011-12-26 | Electronically controlled fuel injection valve |
Country Status (4)
Country | Link |
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EP (1) | EP2660460B1 (en) |
JP (1) | JP5760095B2 (en) |
CN (1) | CN103339369B (en) |
WO (1) | WO2012091393A2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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EP3267028A1 (en) * | 2016-07-06 | 2018-01-10 | Continental Automotive GmbH | Valve assembly for an injection valve, injection valve and injection method |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6161773A (en) * | 1994-05-31 | 2000-12-19 | Caterpillar Inc. | Fuel injector nozzle with guide to check clearance passage providing injection rate shaping |
JPH10131828A (en) * | 1996-10-31 | 1998-05-19 | Mitsubishi Heavy Ind Ltd | Injection valve device |
DE19701879A1 (en) * | 1997-01-21 | 1998-07-23 | Bosch Gmbh Robert | Fuel injection device for internal combustion engines |
DE19717419C1 (en) * | 1997-04-25 | 1998-07-30 | Daimler Benz Ag | Injector valve for internal combustion engine of vehicle |
JP3991470B2 (en) * | 1998-09-14 | 2007-10-17 | 株式会社デンソー | Injection valve |
DE10001828A1 (en) * | 2000-01-18 | 2001-07-19 | Fev Motorentech Gmbh | Direct-control fuel injection device for combustion engine has valve body with actuator to move it in opening direction to let fuel flow from high pressure channel to connecting channel |
US7124746B2 (en) * | 2002-07-16 | 2006-10-24 | Brocco Douglas S | Method and apparatus for controlling a fuel injector |
DE10359169A1 (en) * | 2003-12-17 | 2005-07-21 | Robert Bosch Gmbh | Fuel injection device for internal combustion engine, has control valve that closes during small stroke of piston to keep valve component in closed position, and control space separated from operating space during big stroke of piston |
JP5044368B2 (en) * | 2007-11-06 | 2012-10-10 | 株式会社デンソー | Fuel injection valve |
JP5257216B2 (en) * | 2009-04-20 | 2013-08-07 | トヨタ自動車株式会社 | Fuel injection valve |
-
2011
- 2011-12-26 EP EP11852720.9A patent/EP2660460B1/en active Active
- 2011-12-26 CN CN201180062787.9A patent/CN103339369B/en active Active
- 2011-12-26 JP JP2013547325A patent/JP5760095B2/en active Active
- 2011-12-26 WO PCT/KR2011/010120 patent/WO2012091393A2/en active Application Filing
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Also Published As
Publication number | Publication date |
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EP2660460A2 (en) | 2013-11-06 |
CN103339369A (en) | 2013-10-02 |
EP2660460A4 (en) | 2016-05-04 |
WO2012091393A3 (en) | 2012-08-23 |
JP2014501360A (en) | 2014-01-20 |
JP5760095B2 (en) | 2015-08-05 |
CN103339369B (en) | 2015-07-01 |
WO2012091393A2 (en) | 2012-07-05 |
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