EP1925814A1 - Injecteur de carburant pour un dispositif de mesure - Google Patents

Injecteur de carburant pour un dispositif de mesure Download PDF

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Publication number
EP1925814A1
EP1925814A1 EP07116546A EP07116546A EP1925814A1 EP 1925814 A1 EP1925814 A1 EP 1925814A1 EP 07116546 A EP07116546 A EP 07116546A EP 07116546 A EP07116546 A EP 07116546A EP 1925814 A1 EP1925814 A1 EP 1925814A1
Authority
EP
European Patent Office
Prior art keywords
measuring device
fuel injector
fuel
movement
injector
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.)
Withdrawn
Application number
EP07116546A
Other languages
German (de)
English (en)
Inventor
Patrick Mattes
Kai Sutter
Holger Rapp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1925814A1 publication Critical patent/EP1925814A1/fr
Withdrawn legal-status Critical Current

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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
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle 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
    • 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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing
    • 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
    • F02M2200/24—Fuel-injection apparatus with sensors

Definitions

  • the present invention relates to a fuel injector for an internal combustion engine according to the preamble of claim 1.
  • the present invention relates to a measuring device for detecting the movements of a moving means within the fuel injector.
  • Fuel injectors of the type of interest here find particular application in internal combustion engines, which use such injectors to allow the metered injection of the fuel to be burned.
  • Fuel injectors of the type of interest here can be subdivided into magnetically operated injectors and piezoelectrically operated injectors. Regardless of the type of execution of the fuel injector, this includes a nozzle needle, which is received within a nozzle body. By a lifting movement of the nozzle needle within the nozzle body fuel injection ports are released to inject pressurized fuel into the combustion chamber of the internal combustion engine.
  • a fuel injector for an internal combustion engine which is designed as a magnetically operated injector.
  • the injector comprises a two-stage solenoid valve, wherein the solenoid valve moves a valve piston in a vertical axis of movement.
  • the valve piston is operatively connected to a nozzle needle which abuts against a nozzle needle seat at the end and can release at least one fuel injection opening by means of a lifting movement for injecting the fuel into the combustion chamber and can also close it again.
  • the problem with such executed fuel injectors oscillatory movements in the end positions of the nozzle needle, which may occur when triggered in the nozzle needle seat or when reaching the stroke stop, so that a precise dosage of the fuel quantity to be injected is hindered.
  • a fuel injector is disclosed in the manner of a piezoelectrically operated injector.
  • the nozzle needle is fluidly acted upon in the embodiment of the piezoelectrically operated fuel injector, and is controlled in the lifting movement via a nozzle needle control chamber, a nozzle spring and a pressure chamber surrounding the nozzle needle.
  • the injection quantity is controlled and adjusted merely by setting a rail pressure and a control duration determined from the setpoint quantity and rail pressure.
  • the nozzle needle In CRS systems with a fully ballistic nozzle needle stroke, the nozzle needle essentially opens at a constant speed that is dependent on the rail pressure during the activation period and essentially closes at the end of the activation with a constant closing speed that is dependent on the rail pressure. Consequently, the closing delay duration, ie the time interval between the drive end and the injection end, is a measure of the injection duration and thus of the actually injected amount of the fuel into the combustion chamber.
  • the delay time between the start of control and the stop of the nozzle needle at its stroke stop is a measure of the start of injection, so that over the time intervals between the Anêtbeginn and the stop of the nozzle needle on the stroke stop or between the Anêtende and the start of injection the actual amount injected can be determined.
  • the measuring devices are used for the design and structural design of the movement devices within a fuel injector, and are not suitable for a permanent operation within the fuel injector.
  • known measuring devices in fuel injectors are not suitable for controlling an engine control unit in order to control an amount of fuel actually injected or injected into a combustion chamber via a control circuit.
  • known measuring devices offer the possibility of sensing the stroke movement with regard to the direction and the speed of the movement devices, accurate detection of the stop of the nozzle needle in the nozzle seat and the achievement of the maximum opening in the stroke of the nozzle needle can not be detected with the known measuring devices.
  • the invention includes the technical teaching that the measuring device is designed as an eddy current sensor with a measuring body which at least partially surrounds the movement device, wherein the movement device has a magnetization at least in the region of the enclosure by the measuring body.
  • the moving means is impressed with a magnetic field in the area enclosed by the measuring body.
  • the magnetization can be effected either by a remanent magnetism or by energizing an exciting coil arranged inside the moving means, which can be referred to as external excitation.
  • the magnetic field may be guided by the stationary component of the fuel injector in a magnetic core.
  • a signal is provided by the measuring device which is proportional to the movement speed of the movement device.
  • the axial movement of the movement device induces a voltage in the sensor coil contained in the measuring body.
  • eddy currents are generated by the axial movement of the movement device in the latter. Consequently, in this case as well, a voltage approximately proportional to the movement speed is induced in the sensor coil contained in the measuring body.
  • the functions of exciting and sensor coil can be summarized in an advantageous manner in a coil.
  • the measuring body comprises a magnetic yoke and the fuel injector is designed as a magnetically operated injector and the movement device is formed by a valve piston.
  • the valve piston moves in proportion to the movement of the nozzle needle. Therefore, the magnetic yoke can surround the valve piston, and the magnetization is carried out in the valve piston itself.
  • the valve piston is guided in an injector body, so that the measuring device can be fixedly arranged within the injector.
  • the fuel injector can be designed as a piezoelectrically operated injector with a fluidically actuated nozzle needle, and the movement device is formed by the nozzle needle itself.
  • a magnetization of the material of the nozzle needle can take place on at least a portion of the longitudinal extent, so that the measuring body of the measuring device in the form of the Magnetic yoke encloses the magnetized area of the nozzle needle.
  • the measuring device is installed in the nozzle body stationary.
  • the measuring device is arranged on the low-pressure side of the nozzle body so as not to expose the measuring device to the high-pressure admission by the fuel, although an arrangement on the high-pressure side is likewise possible.
  • this comprises a coil body in addition to the magnetic yoke.
  • the bobbin may be formed either as an excitation coil, as a sensor coil or as a combined exciter and sensor coil.
  • a magnetic field is generated within the moving device by energizing.
  • the magnetic yoke is annular and has a U-shaped cross-section, wherein the opening of the U-shape points in the direction of the movement means.
  • the induced voltage can be removed directly from this. If the exciter and sensor coils are identical and this is supplied with a direct current, the induced voltage causes a deviation of the coil voltage from its value at rest.
  • the longitudinal movement of the movement device along the movement axis causes a deviation of the coil current from its value at rest.
  • the striking of the nozzle needle or the valve piston at its stroke stop in the opening point and the closing of the nozzle needle are accompanied by extremely rapid changes in the piston speed, so that the measurement signal at these times each has a discontinuity.
  • the time at which this discontinuity occurs is detected as Hubanschlags- or closing time and can then a higher-level controller, which is designed for example as an engine control unit or a part thereof, for this time or for the injection duration or the injection amount of the fuel in the Combustion chamber to be supplied.
  • the magnetic yoke is designed radially slotted or has a material with a high resistivity, for example a powder composite material and / or a ferrite material.
  • the invention further relates to a method for detecting the end of the injection of a fuel into a combustion chamber and / or for detecting the stop of an opening stroke of a valve piston and / or a nozzle needle with a Measuring device, wherein the measuring device is operated with a constant DC current or a constant DC voltage, wherein the deviation from the constant DC voltage or from the constant DC serves as a measurement signal.
  • the change in the periodic valve piston and / or nozzle needle movement results in a change in the measurement signal output by means of the measuring device in the form of the discontinuity.
  • the stroke stop or closing times of periodically consecutive opening and closing cycles are determined.
  • the fuel injector shown in Figures 1 and 2 is formed in the manner of a magnetically operated injector and designated by the reference numeral 1.
  • the housing of the fuel injector 1 is formed by an injector body 9 and a nozzle body 10.
  • a movement device is longitudinally movably guided along a movement axis 2, which is formed at least from a valve piston 7 and a nozzle needle 8.
  • a lifting movement of the nozzle needle 8 10 introduced fuel injection ports 3 are released in the nozzle body, so that the fuel can be injected into the combustion chamber 4.
  • the lifting movement is controlled by a - not shown in the illustration - solenoid valve in the moving device.
  • FIG. 1 shows a measuring device 5, which is arranged at the level of the valve piston 7.
  • the measuring device 5 comprises a magnetic yoke 6, in which a bobbin 11 is received.
  • the bobbin 11 can be externally contacted via a connection line 12.
  • the movement device is formed by the valve piston 7 as shown in FIG. 1 and the component relevant for the measuring device 5.
  • the measuring device 5 encloses the valve piston 7 with the U-shaped magnet yoke 6.
  • magnetization has been impressed in a magnetization region 13, which has a north-south orientation along the movement axis 2.
  • the magnetic field changes in the magnetic yoke 6, so that in the bobbin 11, a voltage is induced, which can be tapped via the connecting lines 12.
  • the bobbin 11 comprises both an exciter and a sensor coil, wherein the magnetic field within the valve piston 7 can be generated by energizing the exciter coil. By means of the sensor coil, a voltage is induced, which serves as a measured variable.
  • the measuring device 5 is arranged at the level of the nozzle needle 8. Therefore, the magnetization region 13 is introduced into the nozzle needle 8 to produce a change in the magnetic field during a vertical movement of the nozzle needle 8 along the movement axis 2 in the same way as in the valve piston 7.
  • the structure of the measuring device 5 as shown in Figure 2 in an arrangement around the nozzle needle 8 is similar to the structure in Figure 1, so that the measuring device 5 is also formed from a yoke 6, which receives a bobbin 11. The bobbin 11 is contacted via the connection line 12 externally.
  • the measuring device 5 is fixedly connected to the nozzle body 10 in connection, so that the measuring device 5 does not move with the lifting movement of the nozzle needle 8.
  • the eddy currents within the valve piston or within the nozzle needle introduced in four circumferential grooves in the surface ring members 14 are provided in the region of the measuring device 5. These are made of a material with a very low specific resistance, such as aluminum.
  • the ring elements 14 are introduced into grooves, so that the valve piston 7 in the region of the ring elements 14 has no diameter jumps. According to the illustration of the measuring device 5, this comprises a magnet yoke 6, which, due to the U-shaped design, comprises two subsections which adjoin the valve piston 7 directly. Between the two sections of the bobbin 11 is added.
  • the ring elements 14 are in the idle state of the valve piston 7 at the height of the respective section of the magnetic yoke 6, which adjoin the valve piston 7, respectively. Thus, a total of four ring elements 14 are arranged within the valve piston 7, which adjoin the respective edge regions or the body edges of the U-shaped magnetic yoke 6.
  • Figures 4-6 show the relationship between the stroke of the valve piston (h VK ) and the output signals through the measuring device.
  • the abscissa is marked T and forms the time course.
  • the stroke of the valve piston is shown on the ordinate in the upper graph and marked with h VK .
  • the lower graph represents the induced voltage which induces in the sensor coil and is output by the measuring device.
  • the lower graph represents the current flow which flows through the bobbin.
  • the course of the induced voltage as shown in FIG. 4 initially begins with the beginning of the opening I, the opening period being characterized by the opening end II. Due to the ballistic behavior of the movement of the valve piston or the nozzle needle, the opening end II and the closing start III almost coincide in time. The closing operation extends from the closing start III to the closing end IV.
  • the lower graph shows the induced voltage output by the measuring device. When reaching the end of a steep gradient with subsequent swinging motion is generated, which subsides by damping to zero. This vibration in the induced stress is generated by the dynamic behavior of the nozzle needle which strikes the nozzle seat.
  • the steep gradient in the measurement signal can be detected by an evaluation device of the measurement signal, so that an accurate determination of the closing end 4 by the induced voltage signal is possible. If necessary, the damped oscillation can also be evaluated.
  • FIG. 5 shows the operation of the excitation and sensor coil with an impressed direct current.
  • the respective swinging motion occurs both when reaching the opening end, ie at the time of Hubanschlages the nozzle needle in the open state, and at the end of closing, ie striking the nozzle needle in the nozzle seat ,
  • the deviation of the respective coil voltage from its value in the idle state serves as a measurement signal.
  • the resting state is represented by a knotted dotted centerline.
  • Figure 6 shows the course of the coil current at a constant DC voltage, which is applied to the exciter and sensor coil.
  • the deviation of the coil current from its value in the idle state serves as a measurement signal.
  • the course therefore shows the constant value U o / R in the idle state.
  • the stroke stop times in the opening end II and in the closing time at the closing end IV generate steep gradients in the course of the current, which in turn are followed by damped oscillations.
  • the gradients can be detected by an evaluation device, possibly together with the damped oscillation. This gives the possibility of an exact determination of the To create stroke stop or the closing end, so that the information obtained can be evaluated by an engine control unit.
  • the invention is not limited in its execution to the above-mentioned preferred embodiment. Rather, a number of variants is conceivable, which makes use of the illustrated solution even with fundamentally different types of use.

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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)
  • Fuel-Injection Apparatus (AREA)
EP07116546A 2006-10-30 2007-09-17 Injecteur de carburant pour un dispositif de mesure Withdrawn EP1925814A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610051206 DE102006051206A1 (de) 2006-10-30 2006-10-30 Kraftstoffinjektor mit einer Messeinrichtung

Publications (1)

Publication Number Publication Date
EP1925814A1 true EP1925814A1 (fr) 2008-05-28

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EP07116546A Withdrawn EP1925814A1 (fr) 2006-10-30 2007-09-17 Injecteur de carburant pour un dispositif de mesure

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EP (1) EP1925814A1 (fr)
DE (1) DE102006051206A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1961952A1 (fr) * 2007-02-22 2008-08-27 Robert Bosch Gmbh Injecteur doté d'un module de capteur et système d'injection
WO2011011378A1 (fr) 2009-07-20 2011-01-27 Wayne State University Système d’injection de carburant multidétection et son procédé de fabrication
GB2497515A (en) * 2011-12-05 2013-06-19 Gm Global Tech Operations Inc Solenoid fuel injector system with needle position feedback
ITRM20120507A1 (it) * 2012-10-19 2014-04-20 Politecnico Di Bari Sistema ottico per la misurazione dello spostamento di un corpo mobile annegato in un fluido
WO2015039992A1 (fr) * 2013-09-17 2015-03-26 Robert Bosch Gmbh Injecteur de carburant
WO2016168875A1 (fr) * 2015-04-21 2016-10-27 Ge Jenbacher Gmbh & Co Og Moteur à combustion interne bi-carburant
WO2017153064A1 (fr) * 2016-03-09 2017-09-14 Robert Bosch Gmbh Soupape d'injection de carburant

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010001960A1 (de) 2010-02-16 2011-08-18 Robert Bosch GmbH, 70469 Verfahren zur Erkennung des Schließzeitpunktes eines Einspritzventilgliedes in einem Kraftstoffeinspritzventil sowie Kraftstoffeinspritzventil
DE102014216834A1 (de) 2014-08-25 2016-02-25 Robert Bosch Gmbh Kraftstoffinjektor
CN114718789B (zh) * 2022-03-21 2023-04-18 潍柴动力股份有限公司 一种参数评价方法及装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4366706A (en) * 1979-10-25 1983-01-04 George Wolff Needle position sensing system for a fuel injector nozzle holder
WO2004109087A1 (fr) * 2003-06-11 2004-12-16 Westport Research Inc. Systeme de soupape et procede pour injecter du carburant sous forme gazeuse
US20040261735A1 (en) * 2001-11-20 2004-12-30 Fev Motorentechnik Gmbh Sensor arrangement for recording the movement of an armature with suppression of interfering voltages
WO2005042969A1 (fr) * 2003-09-30 2005-05-12 Fev Motorentechnik Gmbh Ensemble detection servant a detecter le mouvement d'un element de commande deplace par un actionneur selon un mouvement de va-et-vient

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4366706A (en) * 1979-10-25 1983-01-04 George Wolff Needle position sensing system for a fuel injector nozzle holder
US20040261735A1 (en) * 2001-11-20 2004-12-30 Fev Motorentechnik Gmbh Sensor arrangement for recording the movement of an armature with suppression of interfering voltages
WO2004109087A1 (fr) * 2003-06-11 2004-12-16 Westport Research Inc. Systeme de soupape et procede pour injecter du carburant sous forme gazeuse
WO2005042969A1 (fr) * 2003-09-30 2005-05-12 Fev Motorentechnik Gmbh Ensemble detection servant a detecter le mouvement d'un element de commande deplace par un actionneur selon un mouvement de va-et-vient

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1961952A1 (fr) * 2007-02-22 2008-08-27 Robert Bosch Gmbh Injecteur doté d'un module de capteur et système d'injection
WO2011011378A1 (fr) 2009-07-20 2011-01-27 Wayne State University Système d’injection de carburant multidétection et son procédé de fabrication
EP2457077A4 (fr) * 2009-07-20 2016-01-13 Univ Wayne State Système d injection de carburant multidétection et son procédé de fabrication
GB2497515A (en) * 2011-12-05 2013-06-19 Gm Global Tech Operations Inc Solenoid fuel injector system with needle position feedback
ITRM20120507A1 (it) * 2012-10-19 2014-04-20 Politecnico Di Bari Sistema ottico per la misurazione dello spostamento di un corpo mobile annegato in un fluido
WO2014060799A1 (fr) * 2012-10-19 2014-04-24 Politecnico Di Bari Système optique pour la mesure du déplacement d'un corps mobile submergé dans un fluide
WO2015039992A1 (fr) * 2013-09-17 2015-03-26 Robert Bosch Gmbh Injecteur de carburant
WO2016168875A1 (fr) * 2015-04-21 2016-10-27 Ge Jenbacher Gmbh & Co Og Moteur à combustion interne bi-carburant
CN107787399A (zh) * 2015-04-21 2018-03-09 Ge延巴赫两合无限公司 双燃料内燃机
US10352259B2 (en) 2015-04-21 2019-07-16 Innio Jenbacher Gmbh & Co Og Dual-fuel internal combustion engine
WO2017153064A1 (fr) * 2016-03-09 2017-09-14 Robert Bosch Gmbh Soupape d'injection de carburant

Also Published As

Publication number Publication date
DE102006051206A1 (de) 2008-05-08

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