WO2010095252A1 - Dispositif d'injection de carburant - Google Patents

Dispositif d'injection de carburant Download PDF

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Publication number
WO2010095252A1
WO2010095252A1 PCT/JP2009/053134 JP2009053134W WO2010095252A1 WO 2010095252 A1 WO2010095252 A1 WO 2010095252A1 JP 2009053134 W JP2009053134 W JP 2009053134W WO 2010095252 A1 WO2010095252 A1 WO 2010095252A1
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WO
WIPO (PCT)
Prior art keywords
needle
fuel
fuel injection
upper chamber
voltage
Prior art date
Application number
PCT/JP2009/053134
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English (en)
Japanese (ja)
Inventor
大前和広
Original Assignee
トヨタ自動車株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by トヨタ自動車株式会社 filed Critical トヨタ自動車株式会社
Priority to JP2011500421A priority Critical patent/JP5071582B2/ja
Priority to PCT/JP2009/053134 priority patent/WO2010095252A1/fr
Publication of WO2010095252A1 publication Critical patent/WO2010095252A1/fr

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Classifications

    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D41/2096—Output circuits, e.g. for controlling currents in command coils for controlling piezoelectric injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2034—Control of the current gradient
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2051—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using voltage control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F02D41/3863—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • F02M2200/705—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with means for filling or emptying hydraulic chamber, e.g. for compensating clearance or thermal expansion
    • F02M2200/706—Valves for filling or emptying hydraulic chamber

Definitions

  • the present invention relates to a fuel injection device.
  • an injection valve that uses a piezoelectric element as an actuator
  • an injection valve aims to simplify the structure and suppress variations in fuel injection amount.
  • the needle that opens and closes the nozzle hole by contacting and separating from the seat surface in which the nozzle hole is opened, the biasing means that biases the needle in the valve opening direction, and the needle is directly expanded by being extended by the applied voltage.
  • An injection valve including a piezoelectric element that is driven in a valve closing direction has been proposed (see Patent Document 1).
  • Such an injection valve has a simple configuration, and by releasing the voltage applied to the piezoelectric element, the needle is moved in the valve opening direction to inject fuel.
  • an object of the present invention is to avoid fuel injection when the internal combustion engine is stopped in a fuel injection valve that moves the needle in the valve opening direction by releasing the voltage applied to the piezoelectric element.
  • a fuel injection device disclosed in the present specification includes a nozzle body provided with a nozzle hole and a seat portion at a tip portion, and a support portion that is slidably supported on an inner peripheral wall of the nozzle body
  • a needle that is disposed in the nozzle body so as to form a fuel storage chamber on the tip side of the support portion in the nozzle body, and that opens and closes the nozzle hole in contact with and away from the seat portion;
  • a piezoelectric element which is disposed on the proximal end side of the needle so as to form a needle upper chamber between the support portion and moves the needle in a valve closing direction by application of a voltage, and a high pressure in the fuel storage chamber
  • a fuel supply valve for supplying fuel and a control means for controlling application of a voltage to the piezoelectric element.
  • the control means closes the needle when the internal combustion engine is stopped. Status It is characterized by gradually lowering the voltage applied to the piezoelectric element so as to maintain.
  • the voltage applied to the piezoelectric element is gradually reduced so that the closed state of the needle is maintained, thereby gradually reducing the expansion / contraction amount of the piezoelectric element.
  • the volume in the needle upper chamber is gradually increased, and the pressure of the fuel in the needle upper chamber is gradually decreased accordingly.
  • high-pressure fuel is still stored in the fuel storage chamber. That is, the pressure in the fuel storage chamber is higher than the fuel pressure in the needle upper chamber.
  • a static fuel leak occurs between the sliding portion separating the fuel storage chamber and the needle upper chamber, that is, the inner peripheral wall of the nozzle body and the support portion of the needle, and the fuel in the fuel storage chamber gradually flows into the needle upper portion. Flows into the chamber.
  • the pressure receiving area of the needle on the fuel storage chamber side is smaller than the pressure receiving area on the needle upper chamber side by an area corresponding to the seat portion. For this reason, even if the pressure in the fuel storage chamber is slightly higher than the pressure in the needle upper chamber, the needle can be kept closed.
  • the closed valve state of the needle can be maintained even when the voltage is released when the internal combustion engine is stopped.
  • the control means in such a fuel injection device can perform pressure reduction control for reducing the pressure in the fuel supply path after reducing the voltage applied to the piezoelectric element.
  • the control means can perform pressure reduction control for reducing the pressure in the fuel supply path by opening a pressure reduction valve mounted on the common rail.
  • the pressure reduction control for reducing the pressure in the fuel supply path by opening a pressure reduction valve mounted on the common rail.
  • the static leakage of fuel from the fuel storage chamber to the needle upper chamber as described above occurs when the pressure in the fuel storage chamber is higher than the pressure in the needle upper chamber. If the piezoelectric element has already been shrunk and the expansion of the volume in the needle upper chamber has been completed, then the pressure drop in the needle upper chamber due to the volume expansion of the needle upper chamber will not occur. If the expansion of the volume of the needle upper chamber accompanying the fuel replenishment due to the static fuel leak is completed, no further static leak is necessary. Therefore, the pressure in the fuel supply path is reduced after the expansion of the volume of the needle upper chamber is completed. If the pressure in the fuel storage chamber is reduced by this, it is possible to satisfy the request for maintaining the needle closed state and the pressure reduction of the common rail.
  • the fuel injection valve in such a fuel injection device may further include an urging means for urging the needle in the valve closing direction.
  • the force acting on the needle from the needle upper chamber side must exceed the force acting on the needle from the fuel storage chamber side.
  • the pressure on the fuel storage chamber side must be higher than the pressure on the needle upper chamber side.
  • the larger the difference between the pressure on the fuel storage chamber side and the pressure on the needle upper chamber side the greater the amount of static leak and the faster the fuel is supplied to the needle upper chamber. Therefore, it is easy to follow the rapid expansion of the volume of the needle upper chamber. For this reason, the speed at which the voltage applied to the piezoelectric element is lowered can also be increased.
  • the pressure in the needle upper chamber can be further reduced. This is because the biasing means can compensate for the decrease in the force acting on the needle due to the pressure in the needle upper chamber being lowered.
  • the control means in such a fuel injection device can apply a voltage to the piezoelectric element before starting the internal combustion engine when starting the internal combustion engine.
  • the fuel injection valve may include a fuel discharge path for discharging fuel from the needle upper chamber, and a check valve disposed in the fuel discharge path and discharging fuel in the needle upper chamber.
  • the needle upper chamber when the internal combustion engine is stopped is filled with fuel flowing from the fuel storage chamber. If the piezoelectric element is extended in this state filled with fuel, the pressure in the needle upper chamber will increase too much. In some cases, the needle is pressed against the nozzle body, and the fuel injection valve may be damaged.
  • the piezoelectric element can be in an extended state.
  • FIG. 1 is an explanatory diagram showing a schematic configuration of the fuel injection device.
  • FIG. 2A is an explanatory diagram of a cross-sectional dimension of the support portion of the needle.
  • FIG. 2B is an explanatory diagram of the cross-sectional dimensions of the tip of the needle.
  • FIG. 3 is an explanatory view showing a state of the fuel injection valve waiting for fuel injection.
  • FIG. 4 is an explanatory diagram showing the state of the fuel injection valve during fuel injection.
  • FIG. 5 is a graph showing the relationship between the voltage applied to the piezo actuator, the needle upper chamber pressure, and the needle lift amount when the internal combustion engine is in operation.
  • FIG. 6 is an explanatory diagram showing the state of the fuel injection valve when the ignition is turned off.
  • FIG. 1 is an explanatory diagram showing a schematic configuration of the fuel injection device.
  • FIG. 2A is an explanatory diagram of a cross-sectional dimension of the support portion of the needle.
  • FIG. 2B is an explanatory diagram of
  • FIG. 7 is an explanatory view showing, in an enlarged manner, the periphery of the support portion of the needle when the ignition is turned off.
  • FIG. 8 is a graph showing changes in voltage per unit time of the needle upper chamber volume due to the voltage applied to the piezo actuator, the needle upper chamber pressure, the static leak amount, and the piezo displacement when the ignition is turned off.
  • FIG. 9 is an explanatory diagram showing the state of the fuel injection valve when the ignition is turned on.
  • FIG. 10 is an explanatory view showing a schematic configuration of another fuel injection valve.
  • FIG. 1 is an explanatory diagram showing a schematic configuration of the fuel injection device 100.
  • the fuel injection device 100 includes a fuel injection valve 1.
  • the fuel injection valve 1 includes a nozzle body 2 having a nozzle hole 4 and a seat portion 5 provided at the tip.
  • the nozzle body 2 is provided with a sac chamber 3 at the tip, and a nozzle hole 4 is provided so that the sac chamber 3 communicates with the outside.
  • the seat portion 5 is located at the upper edge of the sack chamber 3.
  • the fuel injection valve 1 includes a needle 7.
  • the needle 7 includes a support portion 7 a that is slidably supported on the inner peripheral wall 2 a of the nozzle body 2. Further, the needle 7 is disposed in the nozzle body 2 so as to form the fuel storage chamber 6 on the tip side of the support portion 7 a in the nozzle body 2. Then, the needle 7 opens and closes the nozzle hole 4 with its tip end being in contact with and separating from the seat portion 5.
  • the diameter of the support portion 7a of the needle 7 is set to Dn as shown in FIGS. 1 and 2A. Moreover, the diameter of the part which contact
  • the support part 7a is the thickest part. For this reason, the area of the support part 7a is the needle cross-sectional area, and the needle cross-sectional area is An calculated from Dn. Further, the sheet cross-sectional area is As calculated from Ds.
  • a spring 9 is disposed on the proximal end side of the needle 7.
  • the spring 9 is sandwiched between the needle 7 and the nozzle body 2 and urges the needle 7 in the valve closing direction.
  • the spring 9 is an example of an urging unit in the present invention.
  • the spring force of the spring 9 is set to F.
  • the fuel injection valve 1 includes a piezoelectric actuator 10 in which piezoelectric elements are stacked.
  • the piezo actuator 10 is disposed on the base end side of the needle 7 so that the needle upper chamber 8 is formed between the piezo actuator 10 and the support portion 7a.
  • the piezoelectric actuator 10 moves the needle 7 in the valve closing direction by applying a voltage.
  • Such a piezo actuator 10 is connected to a piezo drive circuit 11.
  • the piezo drive circuit 11 is electrically connected to an ECU (Electronic Control Unit) 12 corresponding to the control means in the present invention. That is, the ECU 12 controls the application of voltage to the piezo actuator 10.
  • ECU Electronic Control Unit
  • the ECU 12 issues a control command to the piezo drive circuit 11, and the piezo drive circuit 11 applies a voltage to the piezo actuator 10 based on the control command of the ECU 12.
  • the diameter of the piezo actuator 10 is set to Dp, and the cross-sectional area of the piezo actuator 10 is set to Ap.
  • the fuel injection valve 1 includes a fuel supply path 13 for supplying high-pressure fuel to the fuel storage chamber 6.
  • the fuel supply path 13 is connected to the common rail 15.
  • the common rail 15 includes a pressure reducing valve 15a.
  • the pressure reducing valve 15a is electrically connected to the ECU 12. When the ECU 12 opens the pressure reducing valve 15a, the pressure reducing control in the present invention is executed. That is, by opening the pressure reducing valve 15a and reducing the pressure in the common rail 15, the pressure in the fuel supply path 13, and hence the pressure in the fuel storage chamber 6, can be reduced.
  • the needle upper chamber 8 and the fuel supply path 13 are connected by a fuel discharge path 14.
  • the fuel discharge path 14 is provided for discharging fuel from the needle upper chamber 8.
  • the fuel discharge path 14 is provided with a check valve 14a.
  • the check valve 14a is arranged so as to allow only the fuel flowing in the direction discharged from the needle upper chamber 8.
  • the piezo actuator 10 provided in the fuel injection valve 1 of the present embodiment moves the needle 7 in the valve closing direction, that is, the distal end side by applying a voltage.
  • the fuel storage chamber 6 is replenished with high-pressure fuel from the common rail 15 shown in FIG.
  • the common rail pressure is Pc.
  • the piezo actuator 10 to which a voltage is applied from the piezo drive circuit 11 is extended, the fuel in the needle upper chamber 8 is in a pressurized state.
  • the needle upper chamber pressure Pup is the common rail pressure Pc at the maximum, and the high pressure fuel at the common rail pressure Pc is flowing in the fuel supply path 13, so that the check valve 14 a is opened. There is nothing.
  • valve opening pressure Pup_op that is, the needle upper chamber pressure Pup when the valve is opened is determined as follows.
  • the force to move the needle 7 in the valve opening direction is Pc ⁇ (An ⁇ As) + Psac ⁇ (As)
  • the force to move the needle 7 in the valve closing direction is Pup ⁇ An + F
  • Pc Common rail pressure
  • An Needle cross-sectional area As: Seat cross-sectional area
  • Psac Suck chamber pressure
  • Pup Needle upper chamber pressure
  • the piezo actuator 10 provided in the fuel injection valve 1 of the present embodiment moves the needle 7 in the valve opening direction, that is, the base end side by releasing the application of voltage.
  • the fuel storage chamber 6 is replenished with high-pressure fuel from the common rail 15 shown in FIG.
  • the volume of the needle upper chamber 8 is expanded by the contraction of the piezoelectric actuator 10 from which the voltage application from the piezoelectric drive circuit 11 is released. Along with this, the needle upper chamber pressure Pup decreases.
  • the needle 7 moves in the valve opening direction, whereby the fuel in the sac chamber 3 and the fuel storage chamber 6 is injected from the injection hole 4. .
  • the needle upper chamber pressure Pup is the common rail pressure Pc at the maximum, and the high pressure fuel of the common rail pressure Pc is circulating in the fuel supply path 13, so that the check valve 14a is opened.
  • the fuel injection valve 1 performs fuel injection by performing the above operation.
  • the movement of the needle 7 is organized with reference to FIG.
  • the piezo drive circuit 11 first releases the voltage at the time t1 from the state where the voltage is applied to the piezo actuator 10.
  • the voltage applied to the piezo actuator 10 and the amount of expansion / contraction of the piezo actuator 10 are in a corresponding relationship.
  • the piezo actuator 10 starts to contract.
  • the needle upper chamber pressure Pup also decreases.
  • the contraction amount of the piezo actuator 10 and the needle lift amount are synchronized. For this reason, the needle upper chamber pressure Pup is kept constant during the time t2 to t3.
  • the time t3 indicates the time when the needle lift amount reaches the maximum, that is, reaches the full lift.
  • the voltage drop to the piezo actuator 10 continues after time t3. Therefore, the needle upper chamber pressure Pup decreases again during the time t3 to t4. At time t4, the piezoelectric actuator 10 is in the most contracted state. From this time t4 to t5, the needle upper chamber pressure Pup is constant.
  • the piezo drive circuit 11 starts applying a voltage to the piezo actuator 10. Then, since the piezo actuator 10 starts to expand, the needle upper chamber pressure Pup starts to increase. However, the needle upper chamber pressure Pup between times t5 and t6 has not yet reached the pressure at which the needle 7 can be moved. Therefore, the needle lift amount does not change between times t5 and t6.
  • time t6 At time t6, once the needle 7 starts to move, the extension amount of the piezo actuator 10 and the needle lift amount are synchronized. For this reason, the needle upper chamber pressure Pup is kept constant during the time t6 to t7.
  • time t ⁇ b> 7 indicates the time when the needle lift amount is minimum, that is, the needle 7 is seated on the seat portion 5.
  • the piezoelectric actuator 10 After the time t7, the voltage increase to the piezo actuator 10 continues. For this reason, the needle upper chamber pressure Pup rises again during the time t7 to t8. At time t8, the piezoelectric actuator 10 is in the most extended state. From this time t7 to t8, the needle upper chamber pressure Pup is constant. The above is the movement of the needle 7.
  • the application of voltage to the piezo actuator 10 is released when the internal combustion engine is stopped.
  • measures are also taken to reduce the common rail pressure Pc.
  • the voltage of the piezo actuator 10 is suddenly released after the common rail pressure Pc is reduced, the following inconveniences can be considered.
  • the ECU 12 gradually decreases the voltage applied to the piezo actuator 10 so that the closed state of the needle 7 is maintained when the internal combustion engine is stopped.
  • FIG. 6 is an explanatory diagram showing the state of the fuel injection valve 1 when the ignition is turned off when the internal combustion engine is stopped.
  • FIG. 7 shows an enlarged view of the periphery of the support portion 7a of the needle 7 when the ignition is turned off.
  • FIG. 8 is a graph showing the transition of the voltage applied to the piezo actuator 10 when the ignition is turned off, the needle upper chamber pressure, the amount of static leak, and the volume change amount of the needle upper chamber due to piezo displacement.
  • the ECU 12 when the ECU 12 detects an ignition off signal, the ECU 12 issues a command to the piezo drive circuit 11 to reduce the voltage.
  • the rate of voltage decrease is set so that the amount of contraction of the piezoelectric actuator 10 becomes ⁇ L per unit time as shown in FIG. Thereby, the amount of change per unit time of the volume of the needle upper chamber 8 changes to a constant after reaching ⁇ L ⁇ Ap.
  • the fuel in the fuel storage chamber 6 flows into the needle upper chamber 8.
  • the support portion 7a of the needle 7 is slidably fitted to the inner peripheral wall 2a of the nozzle body 9, and there is a clearance between them.
  • the fuel storage chamber 6 moves to the needle upper chamber 8 as shown by an arrow 20 in FIG. A static fuel leak occurs. That is, the fuel in the fuel storage chamber 6 flows into the needle upper chamber 8 and is filled in the needle upper chamber 8.
  • the needle upper chamber 8 is gradually filled with fuel. Thereby, it can suppress that needle upper chamber pressure Pup reduces until it reaches valve opening pressure Pup_op, and the valve 7 closed state of needle 7 is maintained. In this manner, the application of voltage to the piezo actuator 10 can be canceled while maintaining the state where the needle 7 shown in FIG. 6 is seated on the seat portion 5. Further, since the needle upper chamber 8 is filled with fuel, it is possible to suppress the generation of bubbles in the needle upper chamber 8. As a result, stable fuel injection can be ensured when the internal combustion engine is restarted.
  • the ECU 12 performs a pressure reduction control for reducing the pressure in the fuel supply path 13 after the release of the voltage application of the piezoelectric actuator 10 is completed. Specifically, the pressure reducing valve 15 a attached to the common rail 15 is opened to reduce the pressure of the common rail 15. As a result, the pressure in the fuel supply path 13 connected to the common rail 15 decreases.
  • the fuel injection device 100 that operates as described above when the internal combustion engine is stopped operates as follows when the internal combustion engine is started.
  • the ECU 12 When starting the internal combustion engine, the ECU 12 applies a voltage to the piezo actuator 10 before starting the internal combustion engine. Specifically, when the ECU 12 detects an ignition ON signal, the ECU 12 issues a command to apply a voltage to the piezo drive circuit 11.
  • the piezoelectric actuator 10 to which voltage is applied starts to expand.
  • the fuel in the needle upper chamber 8 is compressed, and the needle upper chamber pressure Pup increases.
  • the fuel in the needle upper chamber 8 opens the check valve 14 a and is discharged to the fuel supply path 13 through the fuel discharge path 14 as indicated by an arrow 21.
  • the fuel injection valve 1 can shift to a state in which a voltage is applied to the piezo actuator 10 while the needle 7 is closed.
  • the internal combustion engine is stopped in the fuel injection valve 1 that moves the needle 7 in the valve opening direction by releasing the voltage applied to the piezoelectric actuator 10. It is possible to avoid the fuel injection in the state of being performed. Further, it is possible to suppress the generation of bubbles in the needle upper chamber 8 when the internal combustion engine is stopped.
  • a groove 30 may be provided in the support portion 7 a to adjust the amount of static fuel leak from the fuel storage chamber 6 to the needle upper chamber 8.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

L'invention porte sur un dispositif d'injection de carburant (100) comprenant une soupape d'injection de carburant (1) et une unité de commande électronique (12). La soupape d'injection de carburant (1) comprend un corps de buse (2) comportant un orifice de buse (4) et une partie de siège (5) à l'extrémité, et une aiguille (7) comportant une partie de support (7a) portée de manière coulissante sur la paroi périphérique intérieure (2a) du corps de buse (2), disposée dans le corps de buse (2) de telle sorte qu'une chambre de stockage de carburant (6) est formée dans le corps de buse (2), sur le côté d'extrémité de pointe de la partie de support (7a), et ouvre et ferme l'orifice de buse par approche et séparation à partir de la partie de siège (5). La soupape d'injection de carburant (1) comprend en outre un piézo-actionneur (10), disposé sur le côté d'extrémité proximale de telle sorte que l'aiguille (7) de chambre supérieure d'aiguille (8) est placée entre le piézo-actionneur (10) et la partie de support (7a) et déplace l'aiguille (7) dans la direction de fermeture de soupape lorsqu'on lui applique une tension. L'unité de commande électronique (12) abaisse ainsi graduellement la tension appliquée sur le piézo-actionneur (10), de telle sorte que l'état fermé de l'aiguille (7) est maintenu lorsque le moteur à combustion interne est stoppé.
PCT/JP2009/053134 2009-02-23 2009-02-23 Dispositif d'injection de carburant WO2010095252A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2011500421A JP5071582B2 (ja) 2009-02-23 2009-02-23 燃料噴射装置
PCT/JP2009/053134 WO2010095252A1 (fr) 2009-02-23 2009-02-23 Dispositif d'injection de carburant

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PCT/JP2009/053134 WO2010095252A1 (fr) 2009-02-23 2009-02-23 Dispositif d'injection de carburant

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WO2010095252A1 true WO2010095252A1 (fr) 2010-08-26

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0219650A (ja) * 1988-07-07 1990-01-23 Toyota Motor Corp 内燃機関の燃料噴射装置
JPH11153068A (ja) * 1997-11-20 1999-06-08 Nippon Soken Inc 蓄圧式燃料噴射弁
JPH11257185A (ja) * 1998-03-12 1999-09-21 Nissan Motor Co Ltd 差圧式燃料噴射装置
JP2000097123A (ja) * 1998-09-24 2000-04-04 Nissan Motor Co Ltd 圧電式燃料噴射弁及び燃料噴射装置
JP2005500470A (ja) * 2001-08-20 2005-01-06 ローベルト　ボツシユ　ゲゼルシヤフト　ミツト　ベシユレンクテル　ハフツング 燃料噴射弁

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0219650A (ja) * 1988-07-07 1990-01-23 Toyota Motor Corp 内燃機関の燃料噴射装置
JPH11153068A (ja) * 1997-11-20 1999-06-08 Nippon Soken Inc 蓄圧式燃料噴射弁
JPH11257185A (ja) * 1998-03-12 1999-09-21 Nissan Motor Co Ltd 差圧式燃料噴射装置
JP2000097123A (ja) * 1998-09-24 2000-04-04 Nissan Motor Co Ltd 圧電式燃料噴射弁及び燃料噴射装置
JP2005500470A (ja) * 2001-08-20 2005-01-06 ローベルト　ボツシユ　ゲゼルシヤフト　ミツト　ベシユレンクテル　ハフツング 燃料噴射弁

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