CN112049739A - Fuel injector and method for operating a fuel injector - Google Patents

Fuel injector and method for operating a fuel injector Download PDF

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Publication number
CN112049739A
CN112049739A CN202010511030.4A CN202010511030A CN112049739A CN 112049739 A CN112049739 A CN 112049739A CN 202010511030 A CN202010511030 A CN 202010511030A CN 112049739 A CN112049739 A CN 112049739A
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CN
China
Prior art keywords
fuel injector
channel
pin
inlet
feed channel
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Pending
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CN202010511030.4A
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Chinese (zh)
Inventor
M·卡茨
B·莱布斯勒
J·韦斯内尔
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of CN112049739A publication Critical patent/CN112049739A/en
Pending legal-status Critical Current

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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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0248—Injectors
    • F02M21/0251—Details of actuators therefor
    • F02M21/0254—Electric actuators, e.g. solenoid or piezoelectric
    • 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
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • F02M43/04—Injectors peculiar thereto
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention relates to a fuel injector (1) for injecting gaseous fuel into a combustion chamber of an internal combustion engine, comprising at least one nozzle needle that can be moved back and forth for releasing and closing at least one injection opening, wherein the nozzle needle delimits a control chamber that can be acted upon by a hydraulic pressure medium, preferably liquid fuel, via an inlet throttle (2) formed in an inlet channel (3). According to the invention, a magnetic plug (4) is received in the feed channel (3) in the form of an annular gap (5) serving as a feed throttle (2), and at least one electromagnet (6) is provided for acting directly or indirectly on the magnetic plug (4), by means of which the plug (4) can be moved in the radial direction with respect to the feed channel (3). The invention further relates to a method for operating a fuel injector (1).

Description

Fuel injector and method for operating a fuel injector
Technical Field
The present invention relates to a fuel injector for injecting a gaseous fuel, such as Natural Gas (NG), into a combustion chamber of an internal combustion engine.
The fuel injector may be configured as a single fuel injector or as a dual fuel injector. If the latter is the case, the fuel injector may be used to inject or inject two different fuels, for example, a gaseous fuel and a liquid fuel. The gaseous fuel can be ignited, for example, by means of a liquid fuel. This applies in particular when diesel fuel is used as liquid fuel.
The invention further relates to a method for operating such a fuel injector.
Background
In the combustion of gaseous fuels, higher and higher injection pressures are achieved in order to meet the requirements placed on the combustion of diesel fuels at full load. However, high blowing pressures result in the following blowing rates (einblastrates): this injection rate is excessive during part load operation of the internal combustion engine and is often accompanied by undesirable noise generation and/or increased emissions when implemented. This should be avoided.
As a solution, a pressure regulating valve for regulating the pressure of the gas can be provided on the storage container for the gaseous fuel, by means of which pressure regulating valve the at least one fuel injector can be supplied with the gaseous fuel. However, gas pressure regulation by such a pressure regulator is very slow due to the high compressibility of gaseous fuels. Furthermore, a large amount of lost control amounts are generated, which cannot be returned to the gas tank due to the low pressure level, nor can they be supplied to combustion. The resulting control quantity cannot be discharged into the environment either because of the high heating potential ("global warming").
Disclosure of Invention
The object on which the invention is based is therefore to specify a fuel injector for injecting gaseous fuel, which can dynamically shape the injection rate, in particular as a function of the operating point, while the high gas pressure remains constant.
In order to solve this object, a fuel injector is proposed according to the invention. Advantageous developments of the invention result from the preferred embodiments. Furthermore, a method for operating a fuel injector is provided.
Fuel injectors have been proposed for injecting gaseous fuel into the combustion chamber of an internal combustion engine. The fuel injector comprises at least one reciprocatable nozzle needle for releasing and closing at least one blow-in opening, wherein the nozzle needle delimits a control chamber which can be acted upon by a hydraulic pressure medium, preferably liquid fuel, via an inlet throttle formed in an inlet channel. According to the invention, the magnetic plug is received in the supply channel, forming an annular gap serving as an supply throttle. For acting directly or indirectly on the magnetization pin, at least one electromagnet is also provided, by means of which the pin can be moved in the radial direction with respect to the feed channel. The annular gap forming the inlet throttle changes when the pin moves correspondingly. In the case of a central arrangement of the pins, the annular gap has a width which remains constant in the circumferential direction. If the pin abuts on one side against the wall of the supply channel, a sickle-shaped annular gap is formed, which has a maximum width on the diametrically opposite side.
As a result of the change in position of the bolt, the flow through the inlet throttle changes, so that the inlet quantity of hydraulic pressure medium into the control chamber changes. If the input quantity of hydraulic pressure medium is increased during the injection process, the control pressure in the control chamber drops more slowly, which results in the nozzle needle being braked and the speed of the nozzle needle when it is open being reduced.
The adjustability of the flow rate into the throttle makes it possible to shape the blowing rate in dependence on the operating point, in particular in dependence on the load. Furthermore, the regulation can be carried out dynamically, in particular independently of the gas pressure and independently of the pressure medium supply pressure. That is, not only the gas pressure but also the pressure medium supply pressure can be kept constant. It is thus possible to dispense with a gas pressure control or gas pressure regulator on the storage container for the gaseous fuel. Furthermore, the gas supply pressure level can be set so high that maximum needle dynamics are achieved for steeply rising blowing rates at full load, which are then kept at a high level or flattened (ableachen) for optimum consumption.
According to a preferred embodiment of the invention, the inlet channel is divided into a plurality of sections, the bolt being received in a section which is arranged between two sections having a reduced inner diameter. That is, the one section receiving the peg has an increased inner diameter relative to the two adjoining sections. The increase in the inner diameter enables firstly the reception of the peg. However, the inlet channel does not necessarily have an increased inner diameter over its entire length but only in the region of the pin. In this way, the additional installation space requirement can be kept as small as possible.
Furthermore, it is preferred that the two sections with a reduced inner diameter are each arranged eccentrically with respect to the longitudinal axis of the section of the supply channel that receives the pin. The eccentric arrangement of this section disposed upstream makes it possible to introduce hydraulic pressure medium directly into the annular gap between the pin and the wall bounding the inlet channel. Similarly, the eccentric arrangement of the downstream-disposed section makes it possible to lead hydraulic pressure medium out of the annular gap directly into the adjoining section.
Advantageously, the two sections with reduced inner diameter are each connected to the section of the supply channel that receives the pin via an annular channel. The annular channel distributes the supplied hydraulic pressure medium to the periphery of the annular gap or collects the hydraulic pressure medium present in the annular gap, in order to discharge it from the annular gap via the eccentrically arranged section and to supply it to the control chamber. The two annular channels thus ensure that the inlet throttle is not only uniformly flowed through, but also uniformly flowed through.
According to a preferred embodiment of the invention, the at least one electromagnet comprises an annular electromagnetic coil which surrounds the inlet channel at least in sections, preferably the sections of the inlet channel which receive the bolts. If the solenoid coil is energized, a magnetic field is created, the magnetic force of which centers the bolt in the input channel. When the solenoid is not energized, the position of the pin is unstable, i.e., small disturbances and/or inhomogeneities can lead to the pin being pressed from the centered position in the direction of the wall and the pin bearing against the wall as a result of its magnetization. The flow through the annular gap or the inlet throttle is in this case at a maximum. To reduce the flow through the inlet throttle, the solenoid is re-energized, so that the pin is re-centered with respect to the inlet channel.
It is alternatively proposed that at least one electromagnet provided for acting directly or indirectly on the peg is arranged laterally next to the feed channel, further preferably laterally next to a section of the feed channel receiving the peg. In this case, in particular, a laterally arranged single electromagnet is involved. By means of the electromagnet, a magnetic field can be generated which attracts or repels the pin in a targeted manner, so that the pin moves in the radial direction with respect to the feed channel.
As an extension, it is provided that at least some regions of the supply channel, preferably those regions of the supply channel which receive the pins, are formed in a magnetized body, which is preferably in the form of a ring or sleeve. The annular shape or sleeve shape reduces the space requirement of the body. Furthermore, a symmetrical magnetic field can be generated by means of the ring-shaped or sleeve-shaped body, which acts on the magnetized bolt in such a way that the bolt is automatically centered with respect to the feed channel. In order to move the pin in the radial direction, at least one electromagnet is energized, so that a magnetic field is created which acts on the magnetic field of the magnetized body and thus indirectly on the pin.
Preferably, the magnetization plug and the magnetization body have the same polarity. That is, when the electromagnet is de-energized, the peg automatically assumes a position centered with respect to the body. If at least one electromagnet is subsequently energized, the magnetic field of the electromagnet acts oppositely on or intensifies the static magnetic field of the magnetized body. In the case of a lateral arrangement of the at least one electromagnet, the initially symmetrical magnetic field of the magnetized body changes into an asymmetrical magnetic field, so that the magnetized bolt moves out of the centered position in the direction of the wall of the feed channel or of the body and rests thereon. In this position of the bolt, i.e. when the electromagnet is energized, the flow through the annular gap or through the inlet throttle is at a maximum.
To reset the bolt, the energization is simply terminated so that the bolt is automatically centered via the magnetic field of the body. In this position of the bolt, i.e. without the electromagnet being energized, the flow through the annular gap or through the inlet throttle is minimal.
In order to hold the pin in the neutral position, i.e. in a position in which the pin is neither centered nor in contact with the wall of the supply channel, the excitation current with which the at least one electromagnet is energized, can be correspondingly reduced.
Furthermore, it is proposed that the feed channel, preferably the section of the feed channel that receives the pins, be guided through the non-magnetic disk. The non-magnetic disk should prevent magnetic shorting. If the input channel or at least the section of the input channel that receives the pin is formed in a magnetized body, this magnetized body is preferably guided through a non-magnetic disk.
In a development of the invention, it is proposed that a plurality of electromagnets be arranged, preferably at the same angular distance from one another, around the feed channel, preferably around a section of the feed channel that receives the bolt. If all the electromagnets are energized, a symmetrical magnetic field is created, the magnetic force of which causes the peg to be centered about the input channel. If at least one electromagnet is not energized as strongly or not at all, an asymmetric magnetic field is created, the magnetic force of which moves the pin in the radial direction until it comes to bear on one side against the wall of the feed channel. The flow through the inlet throttle is in this case maximum. Turning off the electromagnet is sufficient to press the peg against the wall. The stability of the position of the peg increases with the number of energized electromagnets.
To reset the bolt, all electromagnets are energized with the same energizing current.
Furthermore, a method for operating a fuel injector for injecting gaseous fuel into a combustion chamber of an internal combustion engine is proposed, which fuel injector comprises at least one reciprocatable nozzle needle for releasing and closing at least one injection opening. In order to control the reciprocating movement of the nozzle needle, a control pressure acting on the nozzle needle in a control chamber is varied, which is charged with hydraulic pressure medium via an inlet throttle and discharged via an outlet throttle. The input throttle is formed in the input channel. The hydraulic pressure medium may in particular be a liquid fuel. According to the invention, the flow rate is varied via the inlet throttle in order to control the injection rate of the fuel injector as a function of the operating point. In order to vary the flow rate, the magnetizing plug, which is received in the inlet channel in the form of an annular gap serving as an inlet throttle, is moved in the radial direction relative to the inlet channel by means of at least one electromagnet. Here, the shape of the annular gap changes. Instead of having the same width in the circumferential direction, the annular gap narrows on one side and widens on the diametrically opposite side. If the pin abuts against the wall of the supply duct, the annular gap has a sickle shape and the flow through the annular gap or the supply throttle is maximized.
The proposed method can be carried out in particular using the fuel injector according to the invention. Since the fuel injector has an input throttle suitable for carrying out the method. The same advantages can thus be achieved with this method as with the previously described fuel injector. In other words, a dynamic, preferably operating-point-dependent, in particular load-dependent shaping of the injection rate of the fuel injector can be achieved at a constant, preferably maximum gas pressure.
Drawings
Preferred embodiments of the invention are explained in detail below with the aid of the figures. These figures show:
figure 1 is a schematic longitudinal section through a fuel injector according to a first preferred embodiment of the invention in the region of the inlet throttle with a minimum flow rate,
figure 2 a schematic cross-section of the fuel injector of figure 1,
figure 3 a schematic longitudinal section of the fuel injector of figure 1 at maximum flow,
figure 4 a schematic cross-section of the fuel injector of figure 3,
figure 5 a schematic longitudinal section through an inventive fuel injector according to a second preferred embodiment of the invention in the region of the inlet throttle at maximum flow,
figure 6 is a schematic longitudinal cross-section of the fuel injector of figure 5 at a minimum flow rate,
figure 7 is a schematic cross-section of a fuel injector according to a third preferred embodiment of the invention in the region of the inlet throttle at a minimum flow rate,
figure 8 a schematic longitudinal section through the fuel injector of figure 7 at maximum flow,
fig. 9a) to c) show cross-sections of a fuel injector according to the invention, which is constructed similarly to fig. 7 and 8,
FIG. 10 needle travel Curve (x) and throttle Cross section of the input throttle (A)Z) Image view with respect to time (t).
Detailed Description
A first fuel injector 1 according to the invention for injecting gaseous fuel into a combustion chamber of an internal combustion engine can be seen in part in fig. 1. This detail shows the region of an inlet throttle 2, via which a control chamber (not shown) can be charged with hydraulic pressure medium. By controlling the pressure in the control chamber, the reciprocating movement of a reciprocatable nozzle needle (not shown) can be controlled for releasing and closing at least one blow-in opening (not shown) of the fuel injector. In order to open the nozzle needle, the control pressure in the control chamber must be reduced. The control chamber can be relieved for this purpose by an outlet throttle (not shown) depending on the switching position of a control valve (not shown). If the control valve is open, hydraulic pressure medium flows out of the control chamber. As a result, the pressure in the control chamber drops, so that the resultant force acting on the nozzle needle lifts the nozzle needle from the sealing seat (not shown). In order to close the nozzle needle, the control valve is closed, so that no more hydraulic pressure medium can flow out of the control chamber. As a result, the pressure in the control chamber rises again, so that a hydraulic force exerts a force acting in the closing direction on the nozzle needle.
In order to be able to control the injection rate of the fuel injector 1 in dependence on the operating point, in particular in dependence on the load, the inlet throttle 2 of the fuel injector 1 according to the invention has a variable throttle cross section AZ. In this way, the flow through the inlet throttle 2 or the inlet quantity of hydraulic medium into the control chamber can be controlled in dependence on the operating point, in particular in dependence on the load. Because of fuel feed into the control chamberThe input quantity may influence the opening and/or closing characteristics of the nozzle needle.
For this purpose, the fuel injector 1 of fig. 1 has an inlet channel 3 which opens into the control chamber and is divided into a plurality of sections 3.1, 3.2, 3.3. Between the two sections 3.1, 3.3, a section 3.2 with an increased inner diameter is arranged in which a magnetization pin 4 (in the case of an annular gap 5 designed as an inlet throttle 2) is received. The sections 3.1 and 3.3 are each arranged eccentrically with respect to the longitudinal axis 7 of the bolt 4 and are each connected to the section 3.2 receiving the bolt 4 via an annular channel 3.4 or 3.5. The hydraulic pressure medium supplied to the supply channel 3 therefore flows uniformly through it.
In the fuel injector 1 of fig. 1, the supply channel 3, at least the section 3.2 of the supply channel 3 receiving the magnetized plug 4, is received in a sleeve-shaped magnetized body 9, wherein the body 9 and the plug have the same polarity. The pin 4 is thus automatically centered with respect to the feed channel 3 or the body 9. The annular gap 5 serving as the inlet throttle 2 between the pin 4 and the wall 11 of the body 9 delimiting the inlet channel 3 therefore has a width which remains constant in the circumferential direction (see fig. 2). If the electromagnet 6 arranged laterally next to the input channel 3 is now energized, a magnetic field is created which is superimposed on the magnetic field of the magnetized body 9 in the following manner: the magnetic field is locally weakened or locally enhanced. As a result, the peg 4 moves in the radial direction until it abuts on one side against the body 9 (see fig. 3). On the opposite side, the annular gap 5 widens (see fig. 4), so that the flow through the annular gap 5 or the inlet throttle 2 is maximized. To reset the bolt 4, the energization of the electromagnet 6 is terminated and the bolt 4 is automatically centered again with respect to the magnetized body 9.
The electrical contact of the electromagnet 6 is made by means of pins 12, which are guided parallel to the longitudinal axis 7 of the bolt 4 and which enable the connection of the lines.
It is also known from fig. 1 that the magnetized body 9 is surrounded by a non-magnetic disk 10. The non-magnetic disk should prevent magnetic shorting.
Fig. 5 and 6 show a further preferred second embodiment of the fuel injector 1 according to the invention. This embodiment differs from the embodiment of fig. 1 to 4 in that the electromagnet 6 is not arranged laterally, but rather coaxially with the feed channel 3 or with the section 3.2 of the feed channel 3 that receives the peg 4. That is, the inlet channel 3 is surrounded by an annular electromagnetic coil 8 of the electromagnet 6. Between the annular magnet coil 8 and the feed channel 3, a non-magnetic disk 10 is also arranged here. By means of the electromagnetic coil 8, a magnetic field can be established, the polarity of which is opposite to that of the peg, so that the peg is repelled by the magnetic force of the electromagnet 6. Since the pins 4 are repelled uniformly over their entire circumference by the magnetic field acting thereon from the outside, this results in centering of the pins 4 (see fig. 6). If the current supply to the solenoid coil 8 is terminated, a minimum of interference results in the pin 4 moving in the direction of the wall 11 of the feed channel 3 and abutting against this wall (see fig. 5). Therefore, the flow rate through the input throttle portion 2 is maximized in the case where the electromagnetic coil 8 has no current.
A third preferred embodiment of the fuel injector 1 according to the invention is known from fig. 7 and 8. In this embodiment, a plurality of electromagnets 6 are arranged around the input channel 3. For example, two electromagnets 6 (similar to fig. 9a)), three electromagnets 6 (similar to fig. 9b)) or four electromagnets 6 (similar to fig. 9c)) may be provided. Regardless of the number of electromagnets 6, these are preferably arranged at the same angular spacing relative to one another. If all electromagnets 6 are energized, a magnetic field is formed which centers the peg 4 in the feed channel 3, since the polarity is selected such that the peg 4 is repelled (similar to the embodiment of fig. 5 and 6). The annular gap 5 constituting the input throttle 2 has the same width in the circumferential direction. The flow through the inlet restriction 2 is minimal (see fig. 7).
By switching off only one electromagnet 6, an asymmetric magnetic field is generated which presses the pin 4 on one side against the wall 11 of the feed channel 3. Here, the bolt is close to the electromagnet 6 which is switched off (see fig. 8). At the same time, the annular gap 5 widens on the side opposite the switched-off electromagnet 6, so that the flow through the annular gap 5 or the inlet throttle 2 is maximized. The larger the number of active electromagnets 6, the more stable the eccentric position of the peg 4 (see also fig. 9a) to c)).
With the fuel injectors shown in fig. 1 to 9, the injection rate can be shaped as a function of the operating point, in particular as a function of the load, in particular while maintaining a constant high pressure of the gaseous fuel to be injected). The pressure medium supply pressure can also be kept constant, since the opening and closing behavior of the nozzle needle is influenced only by the input quantity of hydraulic pressure medium into the control chamber by means of the variably adjustable input throttle 2.
A typical needle travel curve x (curve x in the case of full load) is shown in fig. 10 with respect to time t1And curve x under partial load2) And a corresponding throttle cross section AZ(Curve A at full loadZ1And curve A under partial loadZ2)。

Claims (10)

1. A fuel injector (1) for injecting gaseous fuel into a combustion chamber of an internal combustion engine, comprising at least one nozzle needle which can be moved back and forth for releasing and closing at least one injection opening, wherein the nozzle needle delimits a control chamber which can be acted upon by a hydraulic pressure medium, preferably liquid fuel, via an inlet throttle (2) which is formed in an inlet channel (3),
characterized in that a magnetized pin (4) is received in the feed channel (3) in the form of an annular gap (5) serving as a feed throttle (2), and that at least one electromagnet (6) is provided for acting directly or indirectly on the magnetized pin (4), by means of which the pin (4) can be moved in the radial direction with respect to the feed channel (3).
2. The fuel injector (1) according to claim 1,
characterized in that the inlet channel (3) is divided into a plurality of sections (3.1, 3.2, 3.3) and the pin (4) is received in a section (3.2) which is arranged between two sections (3.1, 3.3) having a reduced inner diameter.
3. The fuel injector (1) according to claim 2,
characterized in that the two sections (3.1, 3.3) having a reduced inner diameter are each arranged eccentrically with respect to a longitudinal axis (7) of the section (3.2) of the feed channel (3) receiving the bolt (4).
4. The fuel injector (1) of claim 3,
characterized in that the two sections (3.1, 3.3) with reduced inner diameter are each connected to a section (3.2) of the feed channel (3) that receives the pin (4) via an annular channel (3.4, 3.5).
5. The fuel injector (1) according to one of the preceding claims,
characterized in that the at least one electromagnet (6) comprises an annular electromagnetic coil (8) which surrounds the inlet channel (3) at least in sections, preferably a section (3.2) of the inlet channel (3) which receives the pin (4).
6. The fuel injector (1) according to one of the preceding claims,
characterized in that the at least one electromagnet (6) is arranged laterally next to the feed channel (3), preferably laterally next to a section (3.2) of the feed channel (3) that receives the peg (4).
7. The fuel injector (1) according to one of the preceding claims,
characterized in that the input channel (3) is at least partially formed, preferably the portion (3.2) of the input channel (3) receiving the pin (4), in a magnetized body (9), which is preferably embodied in a ring or sleeve shape.
8. The fuel injector (1) according to one of the preceding claims,
characterized in that the feed channel (3), preferably the section (3.2) of the feed channel (3) receiving the pin (4), and/or the magnetized body (9) is guided through a non-magnetic disk (10).
9. The fuel injector (1) according to one of the preceding claims,
characterized in that a plurality of electromagnets (6) are arranged, preferably at the same angular spacing relative to one another, around the feed channel (3), preferably around a section (3.2) of the feed channel (3) that receives the bolt (4).
10. A method for operating a fuel injector (1) for injecting gaseous fuel into a combustion chamber of an internal combustion engine, comprising at least one nozzle needle that can be moved back and forth for releasing and closing at least one injection opening, wherein, for controlling the back and forth movement of the nozzle needle, a control pressure acting on the nozzle needle is varied in the control chamber, which is acted upon by a hydraulic pressure medium, preferably liquid fuel, via an inlet throttle (2) formed in an inlet channel (3) and is relieved via an outlet throttle,
characterized in that, for controlling the injection rate of the fuel injector in dependence on the operating point, the flow rate is varied by the inlet throttle (2), and in that, for varying the flow rate, a magnetized pin (4) received in the inlet channel (3) in the form of an annular gap (5) serving as inlet throttle (2) is movable in the radial direction with respect to the inlet channel (3) by means of at least one electromagnet (6).
CN202010511030.4A 2019-06-07 2020-06-08 Fuel injector and method for operating a fuel injector Pending CN112049739A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019208333.1 2019-06-07
DE102019208333.1A DE102019208333A1 (en) 2019-06-07 2019-06-07 Fuel injector, method of operating a fuel injector

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Publication Number Publication Date
CN112049739A true CN112049739A (en) 2020-12-08

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DE (1) DE102019208333A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1143137A2 (en) * 2000-04-07 2001-10-10 Siemens Aktiengesellschaft Control unit for an injector of an injection installation
EP3073106A1 (en) * 2015-03-27 2016-09-28 Robert Bosch Gmbh Fuel injector for a fuel injection system
DE102016211680A1 (en) * 2016-06-29 2018-01-04 Robert Bosch Gmbh Injector for introducing fluids, in particular for injecting liquid fuel
DE102016217009A1 (en) * 2016-09-07 2018-03-08 Robert Bosch Gmbh Injection valve for the metering of two fuels
DE102017203150A1 (en) * 2017-02-27 2018-08-30 Robert Bosch Gmbh fuel injector

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1143137A2 (en) * 2000-04-07 2001-10-10 Siemens Aktiengesellschaft Control unit for an injector of an injection installation
EP3073106A1 (en) * 2015-03-27 2016-09-28 Robert Bosch Gmbh Fuel injector for a fuel injection system
DE102016211680A1 (en) * 2016-06-29 2018-01-04 Robert Bosch Gmbh Injector for introducing fluids, in particular for injecting liquid fuel
DE102016217009A1 (en) * 2016-09-07 2018-03-08 Robert Bosch Gmbh Injection valve for the metering of two fuels
DE102017203150A1 (en) * 2017-02-27 2018-08-30 Robert Bosch Gmbh fuel injector

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