EP0826877B1 - Elektro-hydraulisch betätigtes Kraftstoffeinspritzventil mit einer Düsennadel, die direkt angesteuert wird - Google Patents

Elektro-hydraulisch betätigtes Kraftstoffeinspritzventil mit einer Düsennadel, die direkt angesteuert wird Download PDF

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Publication number
EP0826877B1
EP0826877B1 EP19970306118 EP97306118A EP0826877B1 EP 0826877 B1 EP0826877 B1 EP 0826877B1 EP 19970306118 EP19970306118 EP 19970306118 EP 97306118 A EP97306118 A EP 97306118A EP 0826877 B1 EP0826877 B1 EP 0826877B1
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EP
European Patent Office
Prior art keywords
valve member
actuation fluid
fuel
solenoid
needle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19970306118
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English (en)
French (fr)
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EP0826877A3 (de
EP0826877A2 (de
Inventor
Shikui K. Chen
Gregory W. Hefler
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Caterpillar Inc
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Caterpillar Inc
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Filing date
Publication date
Priority claimed from US08/707,804 external-priority patent/US5687693A/en
Priority claimed from US08/768,014 external-priority patent/US5826562A/en
Application filed by Caterpillar Inc filed Critical Caterpillar Inc
Priority to EP01117613A priority Critical patent/EP1152144B1/de
Priority to EP01117614A priority patent/EP1152145B1/de
Publication of EP0826877A2 publication Critical patent/EP0826877A2/de
Publication of EP0826877A3 publication Critical patent/EP0826877A3/de
Application granted granted Critical
Publication of EP0826877B1 publication Critical patent/EP0826877B1/de
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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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification
    • F02M57/026—Construction details of pressure amplifiers, e.g. fuel passages or check valves arranged in the intensifier piston or head, particular diameter relationships, stop members, arrangement of ports or conduits
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • 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
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/105—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive hydraulic drive
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0028—Valves characterised by the valve actuating means hydraulic
    • F02M63/0029—Valves characterised by the valve actuating means hydraulic using a pilot valve controlling a hydraulic chamber
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • F02M63/0036—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat with spherical or partly spherical shaped valve member ends
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
    • F02M63/0042—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing combined with valve seats of the lift valve type
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0045—Three-way valves
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0049—Combined valve units, e.g. for controlling pumping chamber and injection valve
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • F02M2200/502—Springs biasing the valve member to the open position

Definitions

  • the present invention relates generally to fuel injection, and more particularly to hydraulically-actuated fuel injectors with direct control needle valve members, and fuel injection systems and methods of fuel injection using same.
  • Known hydraulically-actuated fuel injection systems and/or components are shown, for example, in DE-A-4 118 237, US-A-5,121,730, US-A-5,271,371, and US-A-5,297,523.
  • a spring biased needle check opens to commence fuel injection when pressure is raised by an intensifier piston/plunger assembly to a valve opening pressure.
  • the intensifier piston is acted upon by a relatively high pressure actuation fluid, such as engine lubricating oil, when a solenoid driven actuation fluid control valve opens the injector's high pressure inlet. Injection is ended by deactivating the solenoid to release pressure above the intensifier piston.
  • the present invention is directed to improving the ability of hydraulically actuated fuel injectors to reliably produce better injection rate shapes during each injection event.
  • a hydraulically actuated fuel injector comprising:
  • Fuel system 10 includes one or more hydraulically-actuated electronically-controlled fuel injectors 14, which are adapted to be positioned in a respective cylinder head bore of engine 12.
  • Fuel system 10 includes an apparatus or means 16 for supply actuating fluid to each injector 14, an apparatus or means 18 for supplying fuel to each injector, a computer 20 for electronically controlling the fuel injection system and an apparatus or means 22 for re-circulating actuation fluid and for recovering hydraulic energy from the actuation fluid leaving each of the injectors.
  • the actuating fluid supply means 16 preferably includes an actuating fluid sump 24, a relatively low pressure actuating fluid transfer pump 26, an actuating fluid cooler 28, one or more actuation fluid filters 30, a high pressure pump 32 for generating relatively high pressure in the actuation fluid and at least one relatively high pressure actuation fluid manifold 36.
  • a common rail passage 38 is arranged in fluid communication with the outlet from the relatively high pressure actuation fluid pump 32.
  • a rail branch passage 40 connects the actuation fluid inlet of each injector 14 to the high pressure common rail passage 38.
  • Actuation fluid leaving the actuation fluid drain 52, 54 (see Fig. 2) of each injector 14 enters a recirculation line 27 that carries the same to the hydraulic energy re-circulating or recovering means 22.
  • a portion of the re-circulated actuation fluid is channeled to high pressure actuation fluid pump 32 and another portion is returned to actuation fluid sump 24 via re-circulation line 33.
  • the actuation fluid is engine lubricating oil and the actuation fluid sump 24 is an engine lubrication oil sump. This allows the fuel injection system to be connected as an additional subsystem to the engine's lubricating oil circulation system.
  • the actuation fluid could be fuel provided by a fuel tank 42 or another source, such as coolant fluid, etc.
  • the fuel supply means 18 preferably includes a fuel tank 42, a fuel supply passage 44 arranged in fluid communication between fuel tank 42 and the fuel inlet 60 (Fig. 2) of each injector 14, a relatively low pressure fuel transfer pump 46, one or more fuel filters 48, a fuel supply regulating valve 49, and a fuel circulation and return passage 47 arranged in fluid communication between injectors 14 and fuel tank 42.
  • the computer 20 preferably includes an electronic control module 11 which controls 1) the fuel injection timing; 2) the total fuel injection quantity during an injection cycle; 3) the fuel injection pressure; 4) the number of separate injections or injection segments during each injection cycle; 5) the time intervals between the injection segments; 6) the fuel quantity of each injection segment during an injection cycle; 7) the actuation fluid pressure; and 8) any combination of the above parameters.
  • Computer 20 receives a plurality of sensor input signals S 1 - S 8 , which correspond to known sensor inputs, such as engine operating condition, load, etc., that are used to determine the precise combination of injection parameters for a subsequent injection cycle.
  • control signal S 9 to control the actuation fluid pressure and a control signal S 10 to control the fluid control valve(s) within each injector 14.
  • control signal S 10 is current to the solenoid commanded by the computer.
  • Injector 14 includes an injector body 15 having an actuation fluid inlet 50 that is connected to a branch rail passage 40, actuation fluid drains 52 and 54 that are connected to actuation fluid recirculation line 27 and a fuel inlet 60 connected to a fuel supply passage 44. (See Fig. 1).
  • Injector 14 includes a hydraulic means for pressurizing fuel within the injector during each injection event and a needle control valve that controls the opening and closing of nozzle outlet 63.
  • the hydraulic means for pressurizing fuel includes an actuation fluid control valve that alternately opens actuation fluid cavity 51 to the high pressure of actuation fluid inlet 50 or the low pressure of actuation fluid drain 52.
  • the actuation fluid control valve includes a three-way solenoid 75 attached to a pin spool valve member 76.
  • An intensifier spool valve member 73 responds to movement of pin spool valve member 76 to alternately open actuation fluid cavity 51 to actuation fluid inlet 50 or low pressure drain 52.
  • the hydraulic pressurizing means also includes actuation fluid cavity 51 that opens to a piston bore 56, within which an intensifier piston 83 reciprocates between a return position (as shown) and a forward position.
  • Injector body 15 also includes a plunger bore 58, within which a plunger 85 reciprocates between a retracted position (as shown) and an advanced position.
  • a portion of plunger bore 58 and plunger 85 define a fuel pressurization chamber 64, within which fuel is pressurized during each injection event.
  • Plunger 85 and intensifier piston 83 are returned to their retracted positions between injection events under the action of compression spring 84.
  • the hydraulic means for pressurizing fuel includes the fuel pressurization chamber 64, plunger 85, intensifier piston 83, actuation fluid inlet 50, actuation fluid cavity 51 and the various components of the actuation fluid control valve, which includes solenoid 75, pin spool valve member 76, ball 53 and intensifier spool valve member 78, etc.
  • Needle valve member 86 includes opening hydraulic surfaces 87 exposed to fluid pressure within nozzle chamber 62 and a closing hydraulic surface 88 exposed to fluid pressure within a needle control chamber 72. Needle valve member 86 includes a needle portion 91 and intensifier portion 92 that are shown as separate pieces for ease of manufacturing, but both portions could be machined as a single integral component.
  • pressurized fuel acts upon the opening hydraulic surfaces 87 whereas actuation fluid acts upon the closing hydraulic surface 88.
  • the closing hydraulic surface and the opening hydraulic surface are sized and arranged such that the needle valve member 86 is hydraulically biased toward its closed position when the needle control chamber is open to a source of high pressure fluid.
  • needle valve member 86 When needle control chamber 72 is opened to a low pressure passage, needle valve member 86 performs as a simple check valve of a type known in the art, in that it opens when fuel pressure acting upon opening hydraulic surfaces 37 is greater than a valve opening pressure sufficient to overcome return spring 89.
  • opening hydraulic surfaces 87 and closing hydraulic surface 88 are preferably sized and arranged such that the needle valve member is hydraulically biased toward its open position when the needle control chamber is connected to a low pressure passage and the fuel pressure within the nozzle chamber is greater than the valve opening pressure.
  • pin spool valve member 76 is not only considered part of the actuation fluid control valve, but also acts as the needle control valve to alternately open actuation fluid control passage 71 to the high pressure of actuation fluid inlet 50 or the low pressure in actuation fluid drain 54.
  • actuation fluid drain 54 constitutes a low pressure passage and actuation fluid inlet 50 constitutes a source of high pressure fluid.
  • Intensifier spool valve member 78 is biased by a compression spring 82 from a closed position, as shown, toward an open position.
  • intensifier spool valve member 78 When intensifier spool valve member 78 is in its closed position as shown, actuation fluid cavity 51 is closed to actuation fluid inlet 50, but open to low pressure actuation fluid drain 52.
  • intensifier spool valve member 78 moves under the action of compression spring 82 to its open position, actuation fluid cavity 51 is opened to actuation fluid inlet 50 and closed to drain 52.
  • the position of intensifier spool valve member 78 is controlled by three position solenoid 75, which is capable of moving actuation pin spool valve member 76 between a first position, a second position, and a third position against the action of compression spring 77.
  • solenoid 75 When solenoid 75 is energized with a full or pull-in current, pin spool valve member 76 is pulled to the left against its stop to a second position. When this occurs, the high pressure actuation fluid pushes ball 53 off of seat 59 to close seat 61. This causes intensifier spool valve member 78 to become hydraulically balanced and it moves toward the right to its open position under the action of compression spring 82. At the same time, pin spool valve member 76 closes control passage 71 to second drain 54 and opens actuation fluid control passage 71 to a transfer passage 70, which is open to the high pressure in actuation fluid cavity 51.
  • a two-way solenoid fuel injector 14' is presented as an alternative to the three-way solenoid fuel injector 14 just described.
  • Fuel injector 14' utilizes a single two-way solenoid 130 to alternately open actuation fluid cavity 109 to actuation fluid inlet 106 or low pressure actuation fluid drain 104, and uses the same solenoid 130 to control the exposure of a needle control chamber 118 to a low pressure passage or a source of high pressure fluid.
  • Fuel injector 14' could be substituted in for the injectors 14 shown in Fig. 1 since both injectors perform substantially similar while one uses a single three-way solenoid and the other uses a single two-way solenoid to accomplish the same tasks.
  • the single two-way solenoid of injector 14' accomplishes what the three-way solenoid of injector 14 does by exploiting a hysteresis effect in the actuation fluid control valve versus the quick response of the needle valve member to the needle control valve.
  • Injector 14' includes an injector body 105 having an actuation fluid inlet 106 that is connected to a branch rail passage 40, an actuation fluid drain 104 that is connected to actuation fluid re-circulation line 27 and a fuel inlet 120 connected to a fuel supply passage 44. (See Fig. 1).
  • Injector 14' includes a hydraulic means for pressurizing fuel within the injector during each injection event and a needle control valve that controls the opening and closing of nozzle outlet 117.
  • the hydraulic means for pressurizing fuel includes an actuation fluid control valve that includes two-way solenoid 130 which is attached to a pin 135.
  • An intensifier spool valve member 140 responds to movement of pin 135 and ball valve member 136 to alternately open actuation fluid cavity 109 to actuation fluid inlet 106 or low pressure drain 104.
  • Actuation fluid cavity 109 opens to a stepped piston bore 110 within which a stepped intensifier piston 150 reciprocates between a return position (as shown) and a forward position.
  • Injector body 105 also includes a plunger bore 111, within which a plunger 153 reciprocates between a retracted position (as shown) and an advanced position.
  • plunger bore 111 and plunger 153 define a fuel pressurization chamber 112, within which fuel is pressurized during each injection event. Plunger 153 and intensifier piston 150 are returned to their retracted positions between injection events under the action of compression spring 154.
  • the hydraulic means for pressurizing fuel includes the fuel pressurization chamber 112, plunger 153, intensifier piston 150, actuation fluid inlet 106, actuation fluid cavity 109 and the various components of the actuation fluid control valve, which includes solenoid 130, ball 136, pin 135 and intensifier spool valve member 140, etc.
  • Ball check 121 prevents the reverse flow of fuel from fuel pressurization chamber 112 into the fuel supply passage during the plunger's downward stroke.
  • Pressurized fuel travels from fuel pressurization chamber 112 via a connection passage 113 to nozzle chamber 114.
  • a needle valve member 160 moves within nozzle chamber 114 between an open position in which nozzle outlet 117 is open and a closed position in which nozzle outlet 117 is closed.
  • needle valve member 160 includes a lower needle portion 161 and an upper intensifier portion 162 separated by spacers 164 and 166, which are all machined as separate components but could be machined as a single integral piece if spring 165 were relocated. Needle valve member 160 is mechanically biased to its closed position by a compression spring 165. Unlike the previous embodiment, compression spring 165 is compressed between spacer 164 and intensifier portion 162. Thus, in this embodiment, when needle valve member 160 is closed and needle control chamber 118 is open to low pressure, intensifier portion 162 is pushed to its upper stop.
  • Needle valve member 160 includes opening hydraulic surfaces 163 exposed to fluid pressure within nozzle chamber 114 and a closing hydraulic surface 167 exposed to fluid pressure within needle control chamber 118.
  • the closing hydraulic surface and the opening hydraulic surfaces are sized and arranged such that the needle valve member 160 is hydraulically biased toward its closed position when the needle control chamber 118 is open to a source of high pressure fluid.
  • the opening hydraulic surfaces 163 and closing hydraulic surface 167 are also preferably sized and arranged such that needle valve member 160 is hydraulically biased toward its open position when the needle control chamber 118 is connected to a low pressure passage and the fuel pressure within nozzle chamber 114 is greater than the valve opening pressure.
  • the actuation fluid control valve of injector 14' can be thought of as including two-way solenoid 130 that is attached to a pin 135 which is normally in contact with ball 136 except when pin 135 is fully retracted. Pin 135 is biased by a compression spring 138 and the hydraulic force on ball 136 toward a retracted position. In this position, ball 136 closes seat 172 and opens seat 173 so that high pressure actuation fluid flows into contact with the end hydraulic surface 141 of intensifier spool valve member 140.
  • solenoid 130 is de-energized
  • actuation fluid cavity 109 is opened to actuation fluid drain 104 past seat 170, and intensifier spool valve member 140 is hydraulically balanced and forced down, as shown, to close seat 171 and open seat 170.
  • the opening and closing of the nozzle outlet 117 via needle valve member 160 is controlled by the needle control valve which includes solenoid 130.
  • pin 135 retracts under the action of compression spring 138 so that high pressure actuation fluid flowing through hollow interior 147 pushes ball 136 to open seat 173 and close seat 172.
  • the high pressure actuation fluid inlet 106 flows past seat 173 along a hidden passage into actuation fluid control passage 119.
  • Actuation fluid control passage 119 opens to needle control chamber 118 and acts upon the closing hydraulic surface 167 of needle valve member 160, pushing the same downward to close nozzle outlet 117.
  • the needle control valve includes solenoid 130, pin 135, ball 136, seat 172 and seat 173.
  • the actuation fluid control valve includes all the components of the needle control valve plus intensifier spool valve member 140, compression spring 145, seat 170 and seat 171.
  • stepped piston bore 110 includes an upper bore 115 and a larger diameter lower bore 116.
  • the stepped top of piston 150 includes a first area 122 that is separated from a second area 132 by a regular cylindrical portion 133.
  • First area 122 and upper bore 115 define an upper cavity 123 that is connected to actuation fluid cavity 109 through a relatively unrestricted flow area 127 when piston 150 is in its retracted position, as shown.
  • Second area 132 and lower bore 116 define a lower cavity 126 that is connected to the actuation fluid cavity 109 via a restricted passage 128 that includes a restricted flow area 131, when the piston is in its retracted position.
  • restricted flow area 131 prevents second area 132 from experiencing the full fluid pressure in actuation fluid cavity 109 until the piston moves a sufficient distance downward that fluid can also flow around annular taper 134 onto second area 132.
  • restricted passage 128 is defined by injector body 105.
  • the height of annular taper 134 is preferably chosen to be sufficiently long that the movement rate of the piston is not influenced by the height of the annular taper. This eliminates one possible area of variability when injectors of this type are mass produced. Control over the design parameters A, B, C and D gives one substantial control over the initial movement rate of piston 150, and hence the initial injection rate profile from the injector.
  • the hole diameter "A" that defines restricted flow area 131, the diameter "B" of upper bore 115 and the height "C” of the regular cylindrical portion 133 can be sized such that when the regular cylindrical portion 133 is still in upper bore 115, the fluid pressure in lower cavity 126 can be made to be essentially a low constant pressure.
  • the height of regular cylindrical portion 133 controls the duration of the slowed piston movement in order to produce a boot injection profile.
  • the regular cylindrical portion 133 moves out of upper bore 115 to open an annular gap between annular taper 134 and upper bore 115.
  • Fig. 8e shows that the pressure on second area 132 remains low until cylindrical portion 133 clears upper bore 115.
  • the height "C” of regular cylindrical portion 133 controls the duration of a flat portion of a boot shaped injection profile. If dimension “C” is short enough, the initial flat portion would disappear, resulting in a ramp up only portion as illustrated in Fig. 8f. Still, dimension “C” preferably has some minimal lead distance length because some movement of the piston is typically necessary to compress the fuel below plunger 153 to a satisfactory injection pressure. Thus, by varying dimensions "A”, “B”, “C”, and “D”, the present invention provides near total flexibility in controlling the front portion of the injection rate trace, which is very important in controlling engine emissions.
  • stepped piston 130 includes a first area 181 that is separated from a second area 132 by a regular cylindrical portion 184.
  • Stepped piston 180 sits atop a plunger 153 and a return spring 154, which are identical to the embodiment previously described.
  • the first area 181 and upper bore 178 define an upper cavity 190 that is connected to an actuation fluid cavity 175 through a relatively unrestricted flow area.
  • the second area 182 and the lower bore 177 define a lower cavity 191 connected to actuation fluid cavity 175 through a relatively restricted flow passage 174 defined by the area between regular cylindrical portion 184 and upper bore 178.
  • This version performs substantially similar to the earlier version but instead of the injector body defining a separate restricted passageway, the piston and barrel define restricted passage 174. Also, this embodiment is different in that instead of an annular taper on the upper stepped portion of the piston, a slot 187 is machined therein.
  • the width of slot 187 is the counterpart to the slope "D" shown in Fig. 2. In other words, the wider the slot, the steeper the ramp up portion of the injection profile. In this embodiment, the difference in the height of the upper step portion from the depth of the slot corresponds to the dimension "C" shown in Fig. 6. In other words, the deeper the slot the less a flat portion (boot) will appear in the injection rate profile.
  • a stepped piston 280 is slidably received in a piston bore 270, which includes a lower bore 271 and an upper bore 272.
  • a first area 281 is separated from a second area 282 by a regular cylindrical portion 284.
  • the first area 281 and upper bore 272 define an upper cavity 290 that is open to the actuation fluid cavity 222 via a relatively unrestricted flow area.
  • the second area 282 and the lower bore 271 define a lower cavity 291 that is connected to actuation fluid cavity 222 via a restricted passage 224.
  • regular cylindrical portion 284 substantially isolates the lower cavity from the upper cavity.
  • a stepped plunger 380 is slidably received and a piston bore 370 that includes a lower bore 371 and an upper bore 372.
  • a first area 381 and the upper bore 372 define an upper cavity, as in the previous embodiments.
  • a second area 382 and lower bore 371 define a lower cavity that is connected to actuation fluid cavity 322 via a restricted passage 324, which in this embodiment is created by slots cut into annular taper 385.
  • the piston and barrel define the restricted passage 324.
  • this embodiment is like the embodiment shown in Fig. 6 in that it includes a regular cylindrical portion 384 and an annular taper portion 385.
  • a stepped piston 480 is slidably received in a piston bore 470 that includes an upper bore 471 and a lower bore 472. Also like the embodiment shown in Fig. 6, the stepped piston includes a regular cylindrical portion 484 and an annular taper 485.
  • Fig. 14 shows another embodiment of the present invention in which still another geometrical variation of the present invention is shown.
  • a stepped piston 530 is slidably received in a piston bore 570.
  • the first area 581 is separated from a second area 582 by a regular cylindrical portion 584.
  • a first cavity 591 is connected to an actuation fluid cavity (not shown) through a restricted passage 524 that includes a restricted flow area 525.
  • a second cavity 590 which acts upon first area 581, is connected to an actuation fluid cavity via an unrestricted flow area 523.
  • each injection sequence is started by applying pull-in current to solenoid 75 in order to move pin spool valve member 76 to the left.
  • Oil pressure that entered the injector and was trapped at seat 59 is now able to push ball valve 53 to close seat 61.
  • High pressure oil can flow past seat 59 through cross grooves in the back side of intensifier spool valve member 78 to act on end hydraulic surface 79.
  • the intensifier spool valve member 78 is now pressure balanced and spring 82 moves it to the right. This opens seat 55 and closes seat 57.
  • the main oil supply can flow through radial openings 81, past seat 55, into actuation fluid cavity 51 to the top of intensifier piston 83, starting it moving downward.
  • Oil is also flowing through a connection passage 70 to the pin spool valve member 76.
  • seat 67 opens and seat 65 closes causing the high pressure in transfer passage 70 to be connected to actuation fluid control passage 71.
  • the high pressure acting on closing hydraulic surface 88 holds needle valve member 86 in its closed position.
  • intensifier piston 83 and plunger 85 moving downward, fuel pressure starts to build within fuel pressurization chamber 64, closing ball check 65.
  • the solenoid pull-in current is reduced to its hold-in current after fuel pressure reaches valve opening pressure.
  • a different injection characteristic takes place. Dropping back to a hold-in current from the initial pull-in current causes the pin spool valve member 76 to close seat 67 and open seat 65. Hold-in current will provide enough force to prevent the solenoid spring 77 from pushing ball valve 53 off of seat 61. The high pressure oil can no longer flow past seat 67 into actuation fluid control passage 71 to pressurize needle control chamber 72. If the solenoid hold-in current is maintained, fuel pressure within nozzle chamber 62 will build via its connection passage 69 to fuel pressurization chamber 64 until a valve opening pressure (VOP) is reached and the needle valve member opens against the action of needle return spring 89.
  • VOP valve opening pressure
  • Fuel injection can be paused or temporarily halted by returning the solenoid current to its pull-in level. This repressurizes the closing hydraulic surface 88 of needle valve member 86 causing it to close. This direct control of needle valve nember 86 allows the nozzle outlet to be opened and closed any number of times during each injection cycle without affecting the hydraulic pressurizing means.
  • solenoid 75 is de-energized. This causes actuation pin spool valve member 76 to close seat 67 and open seat 65. This releases the pressurized oil acting on closing hydraulic surface 88.
  • the solenoid spring 77 causes the actuation valve member 76 to push ball valve 53 from seat 61 back to close seat 59.
  • the high pressure oil supply is closed off at seat 59 and oil pressure on the hydraulic end surface 79 of intensifier spool valve member 78 is released past seat 61 to low pressure drain 54.
  • Intensifier spool valve member 78 is again hydraulically unbalanced causing it to move left against the action of spring 82 to close seat 55 and open seat 57.
  • This injection system provides the ability to vary injection pressures by controlling the pressure of the actuation fluid and provides the ability to control injection characteristics through the direct control of the needle valve member.
  • the direct control of the needle valve member allows the computer to control when the needle valve member is opened at any pressure between valve opening pressure and a maximum injection pressure. This provides a significant amount of control over initial injection mass flow rate in order to produce some rate shaping, if desired.
  • the direct control aspects of the present invention allow for a desirable abrupt end to injection by providing the means by which the needle valve member can be quickly closed at any desired time.
  • each injection sequence is started by energizing the solenoid 130 in order to move ball 136 to open seat 172 and close seat 173.
  • the pressurized fluid previously acting on the end hydraulic surface 141 of spool valve member 140 can drain past seat 172.
  • Intensifier spool valve member 140 is now hydraulically imbalanced and begins to move upward against the action of compression spring 145. This opens seat 171 and closes seat 170.
  • the main oil supply can now flow through radial openings 146, past seat 171, into actuation fluid cavity 109 to the top of intensifier piston 150, starting it moving downward.
  • intensifier piston 150 accelerates downward at a rate lower than it otherwise would if the full fluid pressure were acting over the complete top surface of the intensifier piston.
  • the volume above annular top surface 156 of intensifier piston 150 is filled by fluid flowing through restricted passage 128. As the intensifier piston continues to move downward, it eventually reaches a point where the volume above space 156 is growing faster than fluid can be supplied via passage 128. This causes a momentary hesitation in the piston's downward movement resulting in a slower build-up of fuel pressure underneath plunger 153 in fuel pressurization chamber 112.
  • solenoid 130 is de-energized. This causes ball 136 to open seat 173 and closes seat 172. This resumes the pressurized oil acting on closing hydraulic surface 167 and, with the help of return spring 165, causes needle valve member 160 to close and provide an abrupt end to the injection.
  • the opening of seat 173 causes intensifier spool valve member 140 to again become hydraulically balanced so that compression spring 145 moves the same downward to close seat 171 and open seat 170. This allows actuation fluid in actuation fluid cavity 109 to drain into actuation fluid drain 104 so that intensifier piston 150 and plunger 153 can retract under the action of return spring 154.
  • the present invention is capable of far more complex injection rate profiles than that illustrated in Fig. 8f.
  • the graphs in Figs. 9a - 9e show that, as an example, the injector 14' can be made to produce a pilot injection segment C followed by a "square" main injection segment E.
  • solenoid 130 is initially energized with a maximum current so that ball 136 moves to open seat 172 and close seat 173.
  • the intensifier spool valve member begins to move from its closed position to its open position so that high pressure actuation fluid begins to flow into actuation fluid cavity 109 beginning the piston and plunger moving in their downward stroke.
  • the needle valve member briefly opens to allow pilot injection segment C to occur.
  • the solenoid is briefly de-energized a sufficient amount of time that the ball 136 moves back to its original position to open seat 173 and close seat 172. This again pressurizes the closing hydraulic surface of needle valve member 160 causing it to close.
  • intensifier spool valve member becomes hydraulically balanced and begins to move to close seat 171.
  • spring 145 is relatively weak, the intensifier spool valve member moves rather slowly.
  • the solenoid is again energized causing ball 136 to again close seat 173 and re-open seat 172.
  • a simple "square" injection rate profile can be created by de-energizing the solenoid before fuel pressure in the nozzle chamber reaches the valve opening pressure, and then re-energizing the solenoid before intensifier spool valve member 140 is moved to close seat 170, but after fuel pressure has reached a desired injection pressure above the valve opening pressure.
  • the stepped piston aspect of the present invention finds potential application to any piston and barrel assembly that is hydraulically driven and in which it is desirable to slow the initial movement rate of the piston. This slowing of the initial movement rate of the piston is accomplished by machining various geometrical relationships between the piston and the piston bore rather than through control of the pressure of the fluid acting on the piston as a whole.
  • the present invention finds special application in the case of hydraulically-actuated fuel injectors in which it is desirable to slow the initial movement rate of the piston in order to provide a more desirable front end injection rate trace to reduce undesirable engine emissions.
  • Fig. 6 While any of the embodiments illustrated could be utilized in a fuel injector, the embodiment shown in Fig. 6 is most desired because of the ease with which circular features can be machined in a bore or on a cylindrical piston to relatively tight tolerances. In other words, the slots illustrated in some of the embodiments could prove more difficult to reliably manufacture is mass quantities while maintaining the tight dimension tolerances necessary to produce consistent results.
  • the subject invention is capable of varying peak fuel injection pressure independent of engine speed and load.
  • the subject invention is capable of variably controlling the fuel quantity of each separate fuel injection segment during an injection cycle.
  • the invention is also capable of variably controlling each time interval between each separate fuel injection segment during an injection cycle.
  • the injector solenoid can be energized and de-energized once or a selected plurality of times during an injection cycle to produce one or a variably-selected plurality of injection segments.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (11)

  1. Eine hydraulisch betätigte Kraftstoffeinspritzvorrichtung (14, 14'), die Folgendes aufweist:
    einen Einspritzkörper (15, 105), der einen Betätigungsfluideinlass (50, 106), einen Betätigungsfluidhohlraum (51, 109), einen Düsenauslass (63, 117) und eine Nadelsteuerkammer (72, 118) definiert;
    einen Einzelelektromagneten (75, 130), der am Einspritzkörper (15, 105) angebracht ist;
    ein erstes Ventilglied (78, 140), das im Einspritzkörper (15, 105) montiert ist und bewegbar ist durch den Elektromagneten (75, 130) zwischen einer ersten Position, in welcher der Betätigungsfluideinlass (50, 106) zum Betätigungsfluidhohlraum (51, 109) geöffnet ist, und einer zweiten Position, in welcher der Betätigungsfluideinlass (50, 106) zum Betätigungsfluidhohlraum (51, 109) geschlossen ist;
    ein Nadelventilglied (86, 160) das im Einspritzkörper (15, 105) montiert ist und bewegbar ist zwischen einer geöffneten Position, in welcher der Düsenauslass (63, 117) geöffnet ist, und einer geschlossenen Position, in welcher der Düsenauslass (63, 117) blockiert ist, und wobei das Nadelventilglied (86, 160) eine Schließhydraulikoberfläche (88, 167) hat, die gegenüber dem Druck in der Nadelsteuerkammer (78, 118) ausgesetzt ist; und
    ein getrenntes zweites Ventilglied (76, 136), das im Einspritzkörper (15, 105) montiert ist und bewegbar ist durch den Elektromagneten (75, 130) zwischen einer Aus-Position, in welcher die Nadelsteuerkammer (78, 118) geöffnet ist zu einer Quelle für ein Hochdruckfluid, und einer An-Position, in welcher die Nadelsteuerkammer (78, 118) geöffnet ist zu einem Niedrigdruckdurchlass.
  2. Die Kraftstoffeinspritzvorrichtung (14, 14') nach Anspruch 1, wobei die Quelle für das Hochdruckfluid der Betätigungsfluideinlass (50, 106) ist; wobei der Einspritzkörper (15, 105) einen Betätigungsfluidablauf (54, 104) definiert, und
    wobei der Niedrigdruckdurchlass der Betätigungsfluidablauf (54, 104) ist.
  3. Kraftstoffeinspritzvorrichtung (14') nach Anspruch 1, wobei das zweite Ventilglied ein Kugelventilglied (136) ist; und
       wobei das erste Ventilglied ein Spulenventilglied (140) ist.
  4. Die Kraftstoffeinspritzvorrichtung (14') nach Anspruch 3, wobei das Spulenventilglied (140) eine Endhydraulikoberfläche (141) aufweist und in Richtung auf die zweite Position durch eine Kompressionsfeder (145) vorgespannt ist; und
    wobei die Endhydraulikoberfläche (141) ausgesetzt ist gegen den Druck im Betätigungsfluideinlass (106), wenn das Kugelventilglied (136) sich in der An-Position befindet.
  5. Kraftstoffeinspritzvorrichtung (14') nach Anspruch 4, wobei das Spulenventilglied (140) hydraulisch ausgeglichen ist, wenn sich das Kugelventilglied (136) in der Aus-Position befindet.
  6. Kraftstoffeinspritzvorrichtung (14, 14') nach Anspruch 1, wobei der Einspritzkörper (15, 105), eine Düsenkammer (62, 114), eine Plungerbohrung (58, 111) und eine Kolbenbohrung (56, 110) definiert;
    wobei ein Verstärkungskolben (83, 150) für ein Hin- und Herbewegen in der Kolbenbohrung (56, 110) zwischen einer vorderen Position und einer Rückkehrposition positioniert ist;
    wobei ein Plunger (85, 153) für ein Hin- und Herbewegen in der Plungerbohrung (58, 110) zwischen einer zurückgezogenen Position und einer vorgeschobenen Position positioniert ist; und
    wobei ein Teil der Plungerbohrung (58, 110) und des Plungers (85, 153) eine Kraftstoffdruckbeaufschlagungskammer (64, 112) definiert, die zur Düsenkammer (62, 114) geöffnet ist.
  7. Kraftstoffeinspritzvorrichtung (14') nach Anspruch 1, die weiter einen Stift (135) aufweist, der am Elektromagneten (130) angebracht ist;
    wobei das zweite Ventilglied (136) in Kontakt mit dem Stift (135) ist, wenn es sich in der An-Position befindet, jedoch außer Kontakt mit dem Stift (135) ist, wenn es sich in der Aus-Position befindet.
  8. Kraftstoffeinspritzvorrichtung (14') nach Anspruch 1, wobei das erste Ventilglied (140) eine Endhydraulikoberfläche (141) aufweist und in Richtung der zweiten Position durch eine Kompressionsfeder (145) beaufschlagt ist;
    wobei die Endhydraulikoberfläche (141) ausgesetzt ist gegen den Druck im Betätigungsfluideinlass (106), wenn das zweite Ventilglied (136) in der An-Position ist;
    wobei das erste Ventilglied (140) hydraulisch ausgeglichen ist, wenn das zweite Ventilglied (136) in der Aus-Position ist; und
    wobei die Kompressionsfeder (145) ausreichend weich ist, so dass sich das zweite Ventilglied (136) von der An-Position zur Aus-Position bewegen kann, in der Aus-Position für eine Zeitdauer verweilt und sich zur An-Position zurück bewegt, bevor das erste Ventilglied (140) sich von der ersten Position zur zweiten Position bewegen kann.
  9. Kraftstoffeinspritzvorrichtung nach Anspruch 1, wobei der Elektromagnet ein Zwei-Wege-Elektromagnet (130) ist.
  10. Verfahren für die Kraftstoffeinspritzung, das die Folgenden Schritte aufweist:
    Vorsehen einer hydraulisch betätigten Kraftstoffeinspritzvorrichtung (14') mit einer Düsenkammer (114), die zu einem Düsenauslass (117) geöffnet ist, mit einem Nadelventilglied (160) und einem einzigen Zwei-Wege-Elektromagneten (130), der Teil eines
    Nadelsteuerventils ist, und mit einem Betätigungsfluidsteuerventil, und wobei das Nadelsteuerventil eine Aus-Position und eine An-Position hat, und wobei das Betätigungsfluidsteuerventil eine geöffnete und eine geschlossene Position hat;
    Anregen des Elektromagneten (130) für eine Zeitdauer, die ausreicht zum Bewegen des Betätigungsfluidsteuerventils von der geschlossenen Position zur geöffneten Position und für das Bewegen des Nadelsteuerventils von der Aus-Position zur An-Position getrennt vom Bewegen des Betätigungsfluidsteuerventils;
    hydraulisches Unterdrucksetzen des Kraftstoffs im Einspritzkörper (105, 114) auf einen Einspritzdruck;
    Bewegen des Nadelventilglieds (160) zum Öffnen des Düsenauslasses (117); und
    Abregen des Elektromagneten (130) zum Bewegen des Nadelsteuerventils von der An-Position zur Aus-Position.
  11. Verfahren nach Anspruch 10, wobei das Verfahren weiter den Schritt des Abregens des Elektromagneten (130) aufweist, und zwar vor dem Schritt des Bewegens des Nadelventilglieds (160), für eine ausreichende Zeitdauer zum Bewegen des Nadelsteuerventils von der An-Position zur Aus-Position, jedoch für eine unzureichende Zeitdauer für das Bewegen des Betätigungsfluidsteuerventils von der geöffneten Position zur geschlossenen Position; und
    wobei der Schritt des Bewegens des Nadelventilglieds (160) einen Schritt des erneuten Erregens des Elektromagneten (130) aufweist zum Bewegen des Nadelsteuerventils von der Aus-Position zur An-Position.
EP19970306118 1996-08-30 1997-08-12 Elektro-hydraulisch betätigtes Kraftstoffeinspritzventil mit einer Düsennadel, die direkt angesteuert wird Expired - Lifetime EP0826877B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP01117613A EP1152144B1 (de) 1996-08-30 1997-08-12 Elektro-hydraulisch betätigtes Kraftstoffeinspritzventil mit einer Düsennadel, die direkt angesteuert wird
EP01117614A EP1152145B1 (de) 1996-08-30 1997-08-12 Elektro-hydraulisch betätigtes Kraftstoffeinspritzventil mit einer Düsennadel, die direkt angesteuert wird

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US707804 1996-08-30
US08/707,804 US5687693A (en) 1994-07-29 1996-08-30 Hydraulically-actuated fuel injector with direct control needle valve
US768014 1996-12-13
US08/768,014 US5826562A (en) 1994-07-29 1996-12-13 Piston and barrell assembly with stepped top and hydraulically-actuated fuel injector utilizing same
US08/864,606 US5738075A (en) 1994-07-29 1997-05-28 Hydraulically-actuated fuel injector with direct control needle valve
US864606 1997-05-28

Related Child Applications (2)

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EP01117613A Division EP1152144B1 (de) 1996-08-30 1997-08-12 Elektro-hydraulisch betätigtes Kraftstoffeinspritzventil mit einer Düsennadel, die direkt angesteuert wird
EP01117614A Division EP1152145B1 (de) 1996-08-30 1997-08-12 Elektro-hydraulisch betätigtes Kraftstoffeinspritzventil mit einer Düsennadel, die direkt angesteuert wird

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EP0826877A2 EP0826877A2 (de) 1998-03-04
EP0826877A3 EP0826877A3 (de) 1998-05-06
EP0826877B1 true EP0826877B1 (de) 2003-03-26

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US6129072A (en) * 1999-04-02 2000-10-10 Caterpillar Inc. Hydraulically actuated device having a ball valve member
DE19937713C1 (de) * 1999-08-10 2001-03-15 Siemens Ag Steuerventilanordnung zum Einsatz in einem Kraftstoffinjektor für Verbrennungsmotoren
JP2001304072A (ja) 2000-04-20 2001-10-31 Toyota Industries Corp コモンレール式燃料噴射装置
DE10126685A1 (de) * 2001-06-01 2002-12-19 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung mit Druckverstärker
JP4710853B2 (ja) * 2007-03-05 2011-06-29 株式会社デンソー 燃料噴射装置
EP2478210A4 (de) * 2009-09-17 2013-06-05 Int Engine Intellectual Prop Hochdruckbrennstoffeinspritzer
CN109695511B (zh) * 2019-02-21 2024-01-09 重油高科电控燃油喷射系统有限公司 多缸发动机共轨燃油喷射系统
DE102021206997A1 (de) * 2021-07-05 2023-01-05 Robert Bosch Gesellschaft mit beschränkter Haftung Injektor und Anordnung mit einem Injektor

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DE2213776A1 (de) * 1972-03-22 1973-09-27 Bosch Gmbh Robert Kraftstoffeinspritzanlage fuer brennkraftmaschinen
JPS59141763A (ja) * 1983-02-03 1984-08-14 Nissan Motor Co Ltd 燃料噴射装置
AT408133B (de) * 1990-06-08 2001-09-25 Avl Verbrennungskraft Messtech Einspritzsystem für brennkraftmaschinen
US5121730A (en) 1991-10-11 1992-06-16 Caterpillar Inc. Methods of conditioning fluid in an electronically-controlled unit injector for starting
US5271371A (en) 1991-10-11 1993-12-21 Caterpillar Inc. Actuator and valve assembly for a hydraulically-actuated electronically-controlled injector
US5143291A (en) * 1992-03-16 1992-09-01 Navistar International Transportation Corp. Two-stage hydraulic electrically-controlled unit injector
US5297523A (en) 1993-02-26 1994-03-29 Caterpillar Inc. Tuned actuating fluid inlet manifold for a hydraulically-actuated fuel injection system
EP0641931A1 (de) * 1993-09-06 1995-03-08 Servojet Electronic Systems, Ltd. Speicher-Kraffstoffeinspritzsystem
US5522545A (en) * 1995-01-25 1996-06-04 Caterpillar Inc. Hydraulically actuated fuel injector
DE19523878C2 (de) * 1995-06-30 1999-12-30 Mtu Friedrichshafen Gmbh Einspritzvorrichtung zum Einspritzen von Kraftstoff und einem zweiten Fluid in einen Brennraum eines Dieselmotors

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JPH10110658A (ja) 1998-04-28
DE69720123T2 (de) 2004-01-29
DE69720123D1 (de) 2003-04-30
DE69727713T2 (de) 2004-11-25
DE69727713D1 (de) 2004-03-25
DE69729333D1 (de) 2004-07-01
DE69729333T2 (de) 2004-09-23
EP0826877A3 (de) 1998-05-06
EP0826877A2 (de) 1998-03-04

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