EP3604788A1 - Druckregelventil für ein kraftstoffeinspritzsystem - Google Patents

Druckregelventil für ein kraftstoffeinspritzsystem Download PDF

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Publication number
EP3604788A1
EP3604788A1 EP19184518.9A EP19184518A EP3604788A1 EP 3604788 A1 EP3604788 A1 EP 3604788A1 EP 19184518 A EP19184518 A EP 19184518A EP 3604788 A1 EP3604788 A1 EP 3604788A1
Authority
EP
European Patent Office
Prior art keywords
cavity
control valve
valve
pressure control
pressure
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Withdrawn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
EP19184518.9A
Other languages
English (en)
French (fr)
Inventor
Christophe Tapin
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.)
Delphi Technologies IP Ltd
Original Assignee
Delphi Technologies IP Ltd
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 Delphi Technologies IP Ltd filed Critical Delphi Technologies IP Ltd
Publication of EP3604788A1 publication Critical patent/EP3604788A1/de
Withdrawn legal-status Critical Current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
    • 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
    • F02M63/005—Pressure relief valves
    • 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
    • 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
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • 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
    • F02M2200/244—Force sensors
    • 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
    • F02M2200/247—Pressure sensors
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • 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
    • F02M57/005—Fuel-injectors combined or associated with other devices the devices being sensors

Definitions

  • the present invention generally relates to the field of fuel injection systems for internal combustion engines, and more specifically to a pressure control valve for controlling a flow of fuel in such system.
  • a fuel injection system of an internal combustion engine commonly comprises a high pressure fuel pump feeding a high pressure fuel accumulator, also called common rail, with fuel from the fuel tank.
  • the high pressure fuel is distributed from the fuel accumulator to a plurality of solenoid actuated fuel injectors.
  • the injection system is therefore usually equipped with a pressure control valve and a pressure sensor that are mounted in end cavities of the common rail body.
  • the high pressure valve closes the extremity of the high pressure chamber of the common rail.
  • the high pressure valve may be a pressure limiting valve. It comprises a pressure relief valve mounted in a fluid passage extending between an inlet at the front of the valve housing, in communication with the high pressure fluid in the common rail chamber; and an outlet in the lateral housing wall opening in the end cavity of the common rail, in communication with a low pressure fuel return circuit.
  • Such high pressure valve acts as safety valve for maintaining the pressure inside the common rail at less than a prescribed value.
  • the pressure control valve is mounted by screwing inside the receiving cavity in the common rail and is therefore provided with an external thread that engages a corresponding thread in the lateral cavity wall.
  • the front side of the pressure control valve comes into abutment against the cavity end face.
  • the contact between the front end of the pressure control valve and the bottom face of the cavity will form a fluid-tight separation between the high and low pressure sides. It is thus of importance to properly control the screwing process of the pressure control valve into the cavity to ensure that a proper pressure force exists at the interface between both parts, able to provide a sealed barrier even at high fuel pressures (up to 3000 bars).
  • the screwing force is generally checked by means of a torque wrench.
  • An object of the present invention is to provide an improved way of checking the screwing force of a pressure control valve in such fuel injection system.
  • the present invention proposes a pressure control valve for controlling a flow of fuel in an injection system.
  • the pressure control valve has a housing including: a fluid channel extending between an inlet port and an outlet port, a valve seat in the fluid channel, and a valve element associated with the valve seat to open or close fluid flow therethrough.
  • the housing has a base housing part and a front housing part, the latter being configured to be engaged into a cavity of a fuel system.
  • the front housing part extends along a longitudinal axis and comprises an outer thread that cooperates with a corresponding thread in the cavity for fixing the valve therein by screwing in the longitudinal axis direction.
  • the inlet port is located in the front housing part.
  • the front housing part has an external, annular contact surface that is adapted to be pressed against a corresponding annular sealing surface in the cavity, whereby the annular contact surface separates (seen in the longitudinal axis direction) the region of the inlet port from that of the outlet port.
  • a piezo-resistive element is arranged on the annular contact surface for sensing a contact pressure when the valve is mounted in the cavity and presses against the annular sealing surface of the cavity.
  • the inventive pressure control valve thus includes a pressure transducer/sensor formed by a piezo-resistive element that is configured for sensing the pressure exterted by the control valve against the cavity in which it is mounted.
  • a piezo-resistive element As is known, the resistance of a piezo-resistive element varies with the mechanical strain applied to it.
  • the knowlegde of the contact pressure between the control valve and the cavity can thus be simply determined by evaluating the measurement signal generated by the piezo-resistive element based on conventional resistance measurement.
  • the force applied to the piezo-resistive element will depend on the screwing torque exerted on the pressure control valve. Evaluating the voltage signal of the piezo-resistive element will permit to easily determine the contact pressure exerted by the pressure control valve in the component in which it is mounted.
  • the resistance change with pressure can be substantially linear.
  • the piezo-resistive element permits determining the level of fuel pressure inside the high pressure component. Indeed, the fuel pressure acting on the front side of the pressure control valve exerts a force that is opposite to the screwing force, thus reliveing part of the pressure exerted by the pressure control valve onto its receiving cavity.
  • the contact pressure between the pressure control valve and the cavity decreases, and so does the force applied onto the piezo-resistive element.
  • the contact pressure existing at the interface between the pressure control valve and the cavity depends on the fuel pressure and can be easily determined based on the voltage signal across the piezo-resistive element.
  • the present invention is thus simple to implement and does not interfer with the general design of the pressure control valve. It can thus be used with a variety of valve designs, passive or active.
  • an electrical link is provided in the housing to apply a voltage to the piezo-resistive element, in particular from a connector terminal. It thus suffices to provide one electric wire or path in the valve to be able to measure the resitance of the piezo-resistive element, which is already at groud potentional due to direct contact with the cavity.
  • a peripheral insulating sheeting or coating is advantageously provided on the outer surface of said housing that is to be engaged in said cavity.
  • the piezo-resistive element may be piezo-resistive film or coating that is applied to the annular contact surface of the pressure control valve. Any kind of piezo-resistive element having a resistance depending on the force applied thereo can be used.
  • the housing comprises one or more surfaces circumscribed by said annular contact surface that are oriented transversal to said longitudinal axis and in contact with the fluid pressure.
  • the inlet port is located in a front end face of the front housing part and the annular contact surface is part of the front end face and surrounds said inlet port.
  • the piezo-resistive element is thus arranged at the front end of the pressure control valve, by which it presses against the cavity bottom.
  • the housing may generally comprise a cylindrical housing body with an internal cavity that is closed at the front end by a seat ring.
  • the seat ring has an inner side turned towards the internal cavity and an opposite outer side forming the front end face.
  • the inlet port and valve seat are arranged in the seat ring, an inlet section of the fluid passage extending in the seat ring between the inlet port and the valve seat.
  • the pressure control function of the valve itself may follow various designs, being active or passive.
  • a passive pressure control valve is e.g. a pressure limiting valve.
  • the valve member may be typically biased on the valve seat by a compression spring.
  • the compression spring acts upon an axially guided piston, which in turn acts upon said valve member.
  • valve control is the so-called high pressure valve.
  • the valve includes an electromagnetic actuator (solenoid).
  • a pin is axially moveable in the internal cavity, the pin being coupled at one end to the valve member and at the other end attached to an armature. It further includes an electromagnet adapted to create a magnetic field to move the armature in a first direction.
  • a compression spring preferably acting on the armature, to move the pin in a second direction opposite the first direction. Genrally the pin is biased in the closing direction.
  • the housing comprises an outer thread that cooperates with a corresponding thread in said cavity for fixing the valve therein by screwing in the longitudinal axis direction.
  • the invention concerns a fuel injection component for a fuel injection system, the fuel injection comprising a high pressure reservoir, which, in use, is subjected to fuel at high pressure, wherein
  • fuel injection component comprises one or more of the following features:
  • the invention is applicable to various fuel system componsents, for pressure regulation between high and low pressures sides.
  • the present pressure control valve can be assigned to a common rail or a fuel pump.
  • Fig.1 there is shown a first embodiment of the present pressure control valve 10, wherein the valve is assigned to a common rail and is designed as pressure limiting valve.
  • a common rail conventionally comprises an elongated tubular body and a longitudinal through bore defining an inner volume receiving, in use, high pressure fuel.
  • the body is provided with a cavity at both extremities that are in fluid communication with the longitudinal bore.
  • the rail is conventionally provided with protrusions distributed along the length of the rail body between the extremities.
  • Each of the protrusions has a radially extending high pressure channel, not shown, adapted to flow high pressure fuel either entering the rail or exiting the rail towards fuel injectors.
  • Reference sign 12 in Fig.1 designates such a cavity at one end of a common rail 14.
  • the cavity 12 is cylindrical and comprises a lateral wall 16 and a bottom face 18.
  • the upper region of cavity 12 is provided with a threaded section 20 for screwing the pressure control valve 10 therein.
  • a channel 22 opens laterally in the lower cavity region to provide a return flow path from the cavity to the low pressure circuit of the injection system.
  • An orifice 24 is arranged in the bottom face 16 to enable fluid communication with the longitudinal through bore 15 of the common rail, which is filled in use with high-pressure fuel.
  • reference sign 15 designates a transition bore that opens at one end into the cavity through orifice 24, and at the other is in communication with the longitudinal through bore (not represented). Typically such transition bore 15 has a diameter lower than the longitudinal bore.
  • the longitudinal through bore of the common rail could open directly into the cavity.
  • housing 26 with a front region 26.1, engaged into cavity 12 and a base region 26.2.
  • Housing 26 includes a metallic, cylindrical housing body 28 that extends along a longitudinal axis A and comprises an internal cavity 30, which is closed towards the base region 26.2.
  • a compression spring 29 and a piston 31 are arranged inside the cavity 30.
  • Towards the front region, internal cavity 30 is closed by a seat ring 32.
  • the seat ring has a disk-like body portion 34 with a narrower cylindrical extension 36.
  • the body portion 34 fits in an inlet section of the housing body 28 and rests, with its annular inner side 38 against a shoulder 39 of the body 28.
  • the cylindrical extension 36 of seat ring 32 extends further inside cavity 12.
  • the body portion 34 of seat ring 32 has a front side 40, opposite inner side 38 that forms the end face of the pressure control valve 10.
  • the seat ring 32 is fixed in place in the housing body 28. It is e.g. maintained by the peripheral edge of body 28.
  • control valve In use, the control valve is positioned with the front region 26.2 screwed in cavity 12, the front side 40 being pressed against the bottom face 18 of cavity 12.
  • An outer thread 41 is provided at the outer periphery of the front housing region 26.1, proximal to the base portion. The pressure exerted by the front side 40 onto the cavity bottom 18 depends on the screwing torque applied by means of the cooperating threads 20 and 41.
  • the base portion may comprise a male or female drive configuration, here e.g. a socket head 43 for a Torx wrench (but other shapes can be used).
  • the pressure control function is achieved by way of a check valve formed in a fluid passage 42 provided in the housing 26.
  • the fluid passage 42 extends from an inlet port 44, centrally arranged in front side 40, to a pair of outlet ports 46 located in the housing body 28 and thus opening radially/laterally into the cavity 12.
  • the cavity 12 is sealed from the exterior by a seal ring 37.
  • a valve seat 48 is arranged in the fluid passage 42, namely at the inner end of an inlet section 42.1 of the fluid passage 42 opening in the inner end face of the cylindrical extension 36.
  • the valve seat 48 is formed as an annular sealing surface surrounding the end of inlet section 42.1 and has a spherical cross-section, although other shapes are possible.
  • Reference sign 50 designates a ball-shaped valve element that cooperates with valve seat 48 to control the flow through the latter. Accordingly, valve seat 48 is moveable between a closed position, shown in Fig.1 , wherein it sealingly rests on the valve seat 48 and impedes the flow of fluid downstream thereof, and an open position in which the valve element is off the seat and allows fluid flow therethrough.
  • the valve member is biased in the closed position by the compression spring 29 via piston 31.
  • Spring 29 has a predetermined spring force that its chosen so that the valve element 50 lifts from its seat 48 when the fuel pressure in fluid passage 42 exceeds a predetermined pressure threshold, acting as safety feature to relieve the excess fuel pressure from the fuel rail.
  • the general design and operation of such pressure limiting valve is known in the art and need not be described in further details.
  • a piezo-resistive element 52 is arranged on the front side 40 of the seat ring for sensing a contact pressure when the presure control valve is mounted in the cavity 12 and presses against the bottom face 18 thereof.
  • annular contact surface 54 a part of the front side 40, referred to as annular contact surface 54, presses against a corresponding portion of the bottom face 18, referred to as annular sealing surface 56.
  • annular sealing surface 56 This forms an annular barrier preventing fluid flow along the front side 40 towards the cavity interior.
  • the efficiency of the seal provided by the barrier depends on the screwing strength.
  • the piezo-resistive element 52 is advantageously arranged to be sandwiched between the corresponding annular surfaces 54 and 56 of the seat ring 32 and of the bottom face 18, respectively.
  • An electrical link is provided in the valve 10 to apply a predetermined voltage to the piezo-resistive element 52, whereas the lower side of the piezo-resistive element is in contact with the bottom face 18 of the common rail cavity, which is at ground potential.
  • Such electrical link can be provided by an insulated wire, schematically indicated 58 in Fig.1 , drawn through the housing, e.g. though the housing body 28, and having one end connected to the piezo-resistive element 52, whereas the opposite end connects a contact terminal in a connector portion 60.
  • the provision of the piezo-resistive element 52 at this interface allows measuring the contact pressure between the seat ring 32, respectively the pressure control valve 10, and the bottom face 18. This piezo-resistive element 52 can thus be used for measuring the initial screwing force in the fuel rail cavity 12 as well as for monitoring the fuel pressure inside the common rail.
  • the benefit of the piezo-resistive element 52 is thus to generate a measure signal that depends on the contact force between the valve 10 and the cavity 12.
  • the contact pressure will vary depending on the fuel pressure in the common rail (in the longitudinal through bore). Indeed, the fuel pressure exerts a force on the pressure control valve 10, which has an axial component along axis X, which is also the screwing direction. When the fuel pressure increases, the force exerted by the fuel on the valve 10 also increases, and the contact pressure decreases correspondingly.
  • the increase of pressure in the fuel rail thus causes a decrease of the contact pressure that can be monitored by means of the piezo element 52, the internal resistance of which decreases when an increasing compressive force is applied.
  • the relevant surfaces impacting, in this embodiment, the contact pressure are surfaces of the pressure control valve exposed to the fluid and extending transversally to the longitudinal axis X.
  • the piezo-resistive element 52 may typically be a piezo-resistive film or coating that is applied onto the contact surface 54 at the front of the seat ring 32. It can be single or multi-layered. Any kind of appropriate piezo-resistive technology can be used, allowing to measurement of contact forces/pressures applied thereon. Such force-sensing piezo electric films are known in the art.
  • One example is a hydrocarbon film known as DiaForce® and developed by the Fraunhofer Institute for Manufacturing Technology and Advanced Materials (Brement, Germany).
  • the housing 26 is advantageously electrically insulated. This can be done by providing an insulating sheeting or coating 64 on the external surface of housing 26, or on the cylindrical cavity wall 16.
  • Fig. 3 shows a graph (voltage vs. time) illustrating the response of the piezo element for several fuel rail pressures.
  • the piezo element has a known resistance when its is not subject to any compressive force; and its resistance decreases when a compressive force is applied thereto.
  • the contact pressure decreases, i.e. the compressive force on the piezo element decreases.
  • the change of resistance due to the change of fuel rail pressure does indeed lead to a significant change of voltage that can be properly detected, occuring over several volts for the pressure range of about 2200 bars. Since the resistance of the piezo element increases due to the reduction of pressure thereon, the voltage signal also increases.
  • Fig.2 shows in cross-section a second embodiment, wherein the pressure control valve 110 is designed as a so-called high pressure valve including a solenoid valve for regulating the pressure in the common rail.
  • the general construction of the valve housing is similar to that of Fig.1 , but it here hence contains a solenoid actuator for controlling the valve element. Same or similar elements are indicated by same reference signs, augmented by 100.
  • the housing 126 with its base 126.2 and front 126.1 regions.
  • the cavity 112 in the common rail end face here has a broadened inlet section 112.1.
  • the front region 126.1 has a cylidrical shape with an enlarged section 26.11 adjacent the base portion 126.2 to match the diameter of the inlet section 112.1.
  • An outer thread 141 is provided at the peripheraly of the enlarged section 126.11, which engages a corresponding thread 120 on the lateral wall of the inlet section 126.11 of cavity 12.
  • Housing 126 includes a metallic, cylindrical housing body 128 that extends along a longitudinal axis A and includes an internal bore 130. Towards the front region, bore 130 is closed by a seat ring 132 having a disk-like body portion 134 with a narrower cylindrical extension 136. The body portion 134 fits in an inlet section of the housing body an rests, with its annular inner side 138 against a shoulder 139 of the body 28.
  • the front side 140 of the seat ring 132 opposite inner side 138, forms the end face of the pressure control valve 10.
  • the control valve is positioned with the front region 126.2 screwed in cavity 12, the front side 40 being pressed against the bottom face 18 of cavity 12. The screwing torque applied on the cooperating threads 120 and 140 determines the contact pressure at the front side 140.
  • the pressure regulating function is achieved here by way of a control valve formed in a fluid passage 142 provided in the housing 126, with an associated valve actuator.
  • the fluid passage 142 extends from an inlet port 144, centrally arranged in front side 140, to a pair of outlet ports 146 located in the housing body 128 and thus opening radially/laterally into the cavity 112.
  • a valve seat 148 is arranged in the fluid passage 142, namely at the inner end of an inlet section of the fluid passage 142 opening in the inner end face of the cylindrical extension 136.
  • the valve seat 148 is formed as an annular sealing surface surrounding the end of inlet section and has a spherical cross-section, although other shapes are possible.
  • a ball-shaped valve element 150 cooperates with valve seat 48 to control the flow through the latter.
  • Reference sign 170 designates an armature pin attached at one end (at the base region) to an armature 172.
  • the armature pin 170 is axially guided in cylindrical cavity 130 and biased in direction of the valve seat by spring 129.
  • the other end of armature pin 172 is thus in contact with valve member 150 and presses it against valve seat 148.
  • the armature pin 170 can be moved in the axial direction towards the base portion by energizing coils 174 forming an electromagnet.
  • This internal housing design is well known and will not be further detailed.
  • the piezo-resistive element 152 is arranged on the front side 140 of the seat ring 132 for sensing a contact pressure when the presure control valve 110 is mounted in cavity 112 and presses against the bottom face 118.
  • the piezo-resistive element 152 allows measuring the screwing force of the pressure concrol valve in the cavity, as well as the pressure level inside the fuel rail.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)
EP19184518.9A 2018-08-01 2019-07-04 Druckregelventil für ein kraftstoffeinspritzsystem Withdrawn EP3604788A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1812527.8A GB2576148B (en) 2018-08-01 2018-08-01 Pressure control valve for a fuel injection system

Publications (1)

Publication Number Publication Date
EP3604788A1 true EP3604788A1 (de) 2020-02-05

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ID=63518244

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19184518.9A Withdrawn EP3604788A1 (de) 2018-08-01 2019-07-04 Druckregelventil für ein kraftstoffeinspritzsystem

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EP (1) EP3604788A1 (de)
GB (1) GB2576148B (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1826394A2 (de) * 2006-02-27 2007-08-29 Denso Corporation Schnell ansprechender elektromagnetischer Aktuator
WO2011047821A1 (en) * 2009-10-22 2011-04-28 Skf B.V. Preload sensor
US20110146412A1 (en) * 2009-12-22 2011-06-23 Gert Hoering Sensor element
WO2016206982A1 (en) * 2015-06-23 2016-12-29 Delphi International Operations Luxembourg S.À R.L. Nozzle assembly with adaptive closed signal
DE102016220461A1 (de) * 2016-10-19 2018-04-19 Robert Bosch Gmbh Verfahren zur Ermittlung des Drucks in einem Brennraum einer Brennkraftmaschine, Kraftstoffinjektor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1826394A2 (de) * 2006-02-27 2007-08-29 Denso Corporation Schnell ansprechender elektromagnetischer Aktuator
WO2011047821A1 (en) * 2009-10-22 2011-04-28 Skf B.V. Preload sensor
US20110146412A1 (en) * 2009-12-22 2011-06-23 Gert Hoering Sensor element
WO2016206982A1 (en) * 2015-06-23 2016-12-29 Delphi International Operations Luxembourg S.À R.L. Nozzle assembly with adaptive closed signal
DE102016220461A1 (de) * 2016-10-19 2018-04-19 Robert Bosch Gmbh Verfahren zur Ermittlung des Drucks in einem Brennraum einer Brennkraftmaschine, Kraftstoffinjektor

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Publication number Publication date
GB201812527D0 (en) 2018-09-12
GB2576148A (en) 2020-02-12
GB2576148B (en) 2021-03-24

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