GB2340610A - Needle lift sensor - Google Patents
Needle lift sensor Download PDFInfo
- Publication number
- GB2340610A GB2340610A GB9817886A GB9817886A GB2340610A GB 2340610 A GB2340610 A GB 2340610A GB 9817886 A GB9817886 A GB 9817886A GB 9817886 A GB9817886 A GB 9817886A GB 2340610 A GB2340610 A GB 2340610A
- Authority
- GB
- United Kingdom
- Prior art keywords
- needle
- sensor
- fuel
- probe
- lift sensor
- 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- Withdrawn
Links
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
- 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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/2006—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
- G01D5/2013—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils by a movable ferromagnetic element, e.g. a core
-
- 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
Abstract
A valve needle sensor assembly for monitoring the position of a valve needle (10). A probe (42) is rigidly attached to the valve needle (10) via a support member (40). As the needle slides within the blind bore (12) along a fixed axis, the steel probe (42) located away from this fixed axis moves within a bobbin (44) containing sensor coil windings (46). The inductance of the coil (46) changes as the probe (42) moves within it so the inductance can be used to indicate the axial position of the needle (10).
Description
2340610 NEEDLE LIFT SENSOR This invention relates to a sensor for
monitoring the position of the valve needle of a fuel injector.
It is known to mount a needle lift sensor upon the valve needle of a fuel injector, the sensor extending coaxially with the needle, to permit the position of the needle to be sensed. In such an arrangement, the presence of the sensor results in the injector being of relatively large dimensions. Further, where used in a common rail type system in which the sensor is exposed to very high fuel pressures, for example 2000 bar or more, unacceptably high levels of fuel leakage occur as the sensors are not designed for use in such applications.
It is an object of the invention to provide a needle lift sensor which is of relatively compact form and is suitable for use in applications in which the sensor may be subject to high pressures.
According to the present invention there is provided a needle lift sensor for monitoring movement of a valve needle, the lift sensor comprising a moveable member carried by and moveable with the valve needle, and a sensor arranged to monitor movement of the moveable member in a location spaced from the axis of sliding movement of the valve needle.
The sensor conveniently comprises an inductive displacement transducer.
The moveable member is preferably arranged to carry a probe, the sensor comprising a coil into which the probe extends, movement of the needle causing movement of the probe thus varying the inductance I; the t 2 The coil is preferably wound upon a micro-bobbin. The coil is therefore of small diameter. The micro-bobbin is conveniently of dimensions such that the application of fuel under high pressure thereto urges the microbobbin into sealing engagement with an adapter plate within which the sensor is located.
It will be appreciated that such an arrangement is compact and is designed to withstand high pressures without leaking to an unacceptably high degree. The arrangement is therefore suitable for use in an injector for use in a common rail fuel system, but it will be appreciated that the needle lift sensor may be used in other types of injector.
The invention will further be described, by way of example, with reference to the accompanying drawings, in which:- Figure 1 is a sectional view of part of a fuel injector incorporating the needle lift sensor of an embodiment of the invention; and Figure 2 is a view, in greater detail, illustrating the sensor in use in an alternative injector.
Figure 1 illustrates a fuel injector which comprises a valve needle 10 slidable within a blind bore 12 formed in a nozzle body 14. The blind bore 12 defines, adjacent its blind end, a seating with which the needle 10 is engageable to control the flow of fuel from the bore 12 to a plurality of outlet openings located downstream of the seating. The bore 12 communicates through a supply passage 16 with a common rail charged with fuel to a high pressure by an appropriate high pressure fuel pump.
3 The passage 16 includes a restriction 16a which limits the rate at which fuel can flow to the bore 12, in use.
The nozzle body 14 abuts a distance piece 18 which includes a blind bore defining, with the nozzle body 14, a control chamber 20. A spring 22 is located within the control chamber 20, the spring 22 being arranged to apply a force to the needle 10 urging the needle 10 into engagement with its seating. A passage 24 including a region of small diameter provides a restricted flow path between the passage 16 and the control chamber 20.
The distance piece 18 abuts a valve housing 23 which includes a through bore within which a control valve member 28 is slidable. The valve member 28 includes a region engageable with a seating to control communication between a passage 30 which communicates through a passage 32 provided in the distance piece 18 with the control chamber 20, and a chamber 34 which communicates through passages (not shown) with a low pressure drain reservoir. The valve member 28 is biased by means of a spring (not shown) towards the position illustrated in which such communication is not permitted. The valve member 28 carries an armature 36 which is moveable under the influence of a magnetic field generated, in use, by an electromagnetic actuator (not shown) to lift the valve member 28 away from its seating, to permit such communication to occur.
As illustrated, the passage 32 includes a region of small diameter, thus the rate at which fuel is permitted to flow from the control chamber, in use, is restricted. A further passage 38 is provided in the distance piece 18 providing a restricted flow path from the passage 16 to the passage 32.
4 In use, fuel under high pressure is supplied to the passage 16 from the common rail. thus the bore 12 is charged to a high pressure. The fuel within the bore 12 acts upon angled thrust surfaces 10a of the needle 10, applying a force to the needle 10 urging the needle 10 away from the seating. This force is countered by the action of the spring 22 and the action of the fuel under pressure within the control chamber 20 acting upon the upper end surface of the needle 10. While the fuel pressure within the control chamber 20 is high, the forces urging the needle into engagement with its seating are sufficient to overcome the action of the fuel under pressure upon the thrust surfaces 1 Oa, thus the valve needle 10 remains in engagement with its seating. Fuel injection is therefore not taking place.
In order to commence injection, the actuator is energized to cause the valve member 28 to lift away from its seating. As a result, fuel is able to escape from the control chamber 20 at a restricted rate to the low pressure drain reservoir thus the fuel pressure acting upon the needle 10 urging the needle 10 towards its seating is reduced. The diameters of the restrictions in the passages 24, 32 are chosen to ensure that the rate at which fuel flows from the control chamber 20 exceeds the rate at which fuel is supplied to the control chamber 20. The reduction in the pressure within the control chamber 20 allows the needle 10 to lift away from its seating, thus fuel is able to flow past the seating and is delivered through the outlet openings of the nozzle body 14. During injection, the presence of the restricted region 1 6a in the passage 16 limits the rate at which fuel is supplied to the bore 12, thus the fuel pressure acting upon the thrust surfaces 1 Oa reduces. Further, when the valve needle 10 reaches its fully lifted position, the upper end thereof engages the blind end of the bore defining the control chamber 20 closing the passage 32. As a result, the continued flow of fuel at a restricted rate through the passage 24 commences pressurization of the fuel within the control chamber 20.
When injection is to be terminated, the actuator is de-energized and the valve member 28 returns into engagement with its seating under the action of the spring. Such movement breaks the communication between the passage 32 and the low pressure drain, and the flow of fuel at a restricted rate through the passages 38, 32 increases the pressure acting upon the end surface of the needle 10, and a point will be reached beyond which the fuel pressure acting upon the needle 10 in conjunction with the action of the spring 22 and the fuel pressure within the control chamber 20 is sufficient to return the needle 10 into engagement with its seating, thus terminating injection.
The arrangement illustrated in Figure 2 differs from that of Figure 1 in that the fuel pressure within the chamber 20 is low, the chamber 20 communicating with a low pressure drain through an appropriate passage (not shown). Injection is controlled by controlling the fuel pressure applied to the bore 12, injection occurring when the fuel pressure applied to the bore 12 is sufficient to lift the needle 10 against the action of the spring 22. Injection terminates when the fuel pressure applied to the bore 12 is allowed to fall to a level sufficiently low to allow the needle 10 to move under the action of the spring 22 to return the needle into engagement with its seating.
The injectors described with reference to Figures 1 and 2 both include a needle lift sensor comprising a moveable support member 40 engaged between the spring 22 and the needle 10. The support member 40 includes an annular hub 40g which is integral with an outwardly 6 extending arm 40b. The hub 40a is located within the chamber 20, the arm 40b extending from the chamber 20 along a narrow channel 20a which communicates with the chamber 20, the channel 20a opening into a blind bore 20b which extends parallel to the axis of the bore defining the chamber 20. The outer end of the arm 40b carries a probe 42 in the form of a short length of small diameter magnetic material, for example a 2mrn length of 0.3mrn diameter spring steel. The probe 42 extends in a direction parallel to but spaced from the axis of the needle 10. The probe 42 extends into a blind opening formed in a micro-bobbin 44 which carries a sensor winding 46, the bobbin 44 and winding 46 being located within the bore 20b. The bobbin 44 is conveniently constructed from Torlon or a suitable ceramic material or any alternative suitable insulating material. The outer diameter of the bobbin 44 and winding 46 is conveniently approximately 1.9mm. The ends of the wire forming the winding 46 extends through openings formed in the micro-bobbin 44 and are connected to an appropriate apparatus to allow measurement of the inductance of the winding. It will be appreciated that as the spring steel probe 44 moves, the length of the probe 42 located within the winding 46 changes, thus varying the inductance of the winding, thus the measurements of the inductance of the winding 46 can be used to monitor movement of the needle 10 and to provide an indication as to the axial position of the needle 10.
The lower end region 44a of the bobbin 44 is of increased diameter and is engageable upon a shoulder 20C defined part way along the bore 20b formed in the distance piece 18 within which the micro-bobbin 44 is located. The enlarged diameter end of the bobbin 44 is exposed to the fuel pressure within the chamber 20, thus if the fuel pressure within the chamber 20 is high, then a large force is applied to the micro-bobbin 44 7 resulting in the enlarged diameter end 44a of the bobbin 44 being urged into sealing engagement with the shoulder 20c thus restricting or preventing leakage of fuel from the control chamber 20 past the microbobbin 44. in use.
It will be appreciated that as the probe 42 simply slides within the opening formed in the micro-bobbin 44, but not does engage the microbobbin 44, no additional frictional forces are applied to the needle 10, thus movement of the needle 10, in use, is not impaired.
The provision of such a needle lift sensor permits the position of the needle to be monitored, either during testing or calibration of the injection prior to use, or during use to provide a signal which is input to the controller of the fuel injector for use in controlling the operation of the injector.
8
Claims (6)
1. A needle lift sensor for monitoring movement of a valve needle, the lift sensor comprising a moveable member carried by and moveable with the valve needle, and a sensor arranged to monitor movement of the moveable member in a location spaced from the axis of sliding movement of the valve needle.
2. A lift sensor as claimed in Claim 1, wherein the sensor comprises an inductive displacement transducer.
3. A lift sensor as claimed in Claim 1, wherein the moveable member is arranged to carry a probe, the sensor comprising a coil into which the probe extends, movement of the needle causing movement of the probe thus varying the inductance of the coil. C, c
4. A lift sensor as claimed in Claim 3, wherein the coil is wound upon a micro-bobbin.
5. A lift sensor as claimed in Claim 4, wherein the micro-bobbin is of dimensions such that the application of fuel under high pressure thereto urges the micro-bobbin into sealing engagement with an adapter plate within which the sensor is located.
6. A needle lift sensor substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9817886A GB2340610A (en) | 1998-08-18 | 1998-08-18 | Needle lift sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9817886A GB2340610A (en) | 1998-08-18 | 1998-08-18 | Needle lift sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9817886D0 GB9817886D0 (en) | 1998-10-14 |
| GB2340610A true GB2340610A (en) | 2000-02-23 |
Family
ID=10837373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9817886A Withdrawn GB2340610A (en) | 1998-08-18 | 1998-08-18 | Needle lift sensor |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2340610A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001088366A1 (en) * | 2000-05-18 | 2001-11-22 | Robert Bosch Gmbh | Accumulator fuel-injection system for an internal combustion engine |
| WO2003004862A1 (en) * | 2001-07-02 | 2003-01-16 | Siemens Aktiengesellschaft | Control module for an injector of an accumulator injection system |
| EP1304475A1 (en) * | 2001-10-20 | 2003-04-23 | Robert Bosch Gmbh | Fuel injection valve |
| DE102005007329B3 (en) * | 2005-02-17 | 2006-09-21 | Siemens Ag | Fuel e.g. diesel, injection valve for vehicle`s internal combustion engine, has detection unit for detecting position of valve, and signal transmission connection with transformer operated according to transformator principle |
| EP1925813A1 (en) * | 2006-10-30 | 2008-05-28 | Robert Bosch Gmbh | Fuel injector with a measuring device |
| DE10157886B4 (en) * | 2000-11-27 | 2009-12-17 | DENSO CORPORATION, Kariya-shi | Fuel injection unit of an internal combustion engine |
| WO2010133423A1 (en) * | 2009-05-20 | 2010-11-25 | Robert Bosch Gmbh | Method for measuring the armature lift in a fuel injector |
| WO2016012242A1 (en) * | 2014-07-22 | 2016-01-28 | Delphi International Operations Luxembourg S.À R.L. | Fuel injector |
| WO2017072081A1 (en) * | 2015-10-29 | 2017-05-04 | Delphi International Operations Luxembourg S.À R.L. | Fuel injector |
| WO2017186819A1 (en) * | 2016-04-29 | 2017-11-02 | Delphi International Operations Luxembourg S.À R.L. | Fuel injector |
| CN111189381A (en) * | 2020-01-13 | 2020-05-22 | 中南大学 | Stratum lift detection device based on differential principle |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3956973A (en) * | 1972-07-11 | 1976-05-18 | Basic Aluminum Castings Company | Die casting machine with piston positioning control |
| US4397180A (en) * | 1979-10-25 | 1983-08-09 | Wolff George D | Valve position sensor for a poppet fuel injector valve |
| US4403515A (en) * | 1980-08-29 | 1983-09-13 | Aisin Seiki Company, Limited | Position sensor |
| WO1989007746A1 (en) * | 1988-02-11 | 1989-08-24 | Garshelis Ivan J | Magnetic position sensor |
| EP0392379A2 (en) * | 1989-04-12 | 1990-10-17 | ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni | System for determining axial displacement of a rod, particularly the plunger of an electromagnetic fuel injector |
| EP0431975A1 (en) * | 1989-12-08 | 1991-06-12 | System E Controls Limited | Variable inductance transducers |
| EP0656475A1 (en) * | 1993-12-02 | 1995-06-07 | Robert Bosch Gmbh | Fuel injector with needle position sensor |
| US5442865A (en) * | 1993-03-24 | 1995-08-22 | Vdo Adolf Schindling Ag | Passive magnetic position sensor |
-
1998
- 1998-08-18 GB GB9817886A patent/GB2340610A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3956973A (en) * | 1972-07-11 | 1976-05-18 | Basic Aluminum Castings Company | Die casting machine with piston positioning control |
| US4397180A (en) * | 1979-10-25 | 1983-08-09 | Wolff George D | Valve position sensor for a poppet fuel injector valve |
| US4403515A (en) * | 1980-08-29 | 1983-09-13 | Aisin Seiki Company, Limited | Position sensor |
| WO1989007746A1 (en) * | 1988-02-11 | 1989-08-24 | Garshelis Ivan J | Magnetic position sensor |
| EP0392379A2 (en) * | 1989-04-12 | 1990-10-17 | ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni | System for determining axial displacement of a rod, particularly the plunger of an electromagnetic fuel injector |
| EP0431975A1 (en) * | 1989-12-08 | 1991-06-12 | System E Controls Limited | Variable inductance transducers |
| US5442865A (en) * | 1993-03-24 | 1995-08-22 | Vdo Adolf Schindling Ag | Passive magnetic position sensor |
| EP0656475A1 (en) * | 1993-12-02 | 1995-06-07 | Robert Bosch Gmbh | Fuel injector with needle position sensor |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001088366A1 (en) * | 2000-05-18 | 2001-11-22 | Robert Bosch Gmbh | Accumulator fuel-injection system for an internal combustion engine |
| CZ298185B6 (en) * | 2000-05-18 | 2007-07-18 | Robert Bosch Gmbh | Fuel injection system injection device with Common Rail |
| US6814302B2 (en) | 2000-05-18 | 2004-11-09 | Robert Bosch Gmbh | Accumulator fuel-injection system for an internal combustion engine |
| DE10157886B4 (en) * | 2000-11-27 | 2009-12-17 | DENSO CORPORATION, Kariya-shi | Fuel injection unit of an internal combustion engine |
| US6986474B2 (en) | 2001-07-02 | 2006-01-17 | Siemens Aktiengesellschaft | Control module for an injector of an accumulator injection system |
| WO2003004862A1 (en) * | 2001-07-02 | 2003-01-16 | Siemens Aktiengesellschaft | Control module for an injector of an accumulator injection system |
| EP1304475A1 (en) * | 2001-10-20 | 2003-04-23 | Robert Bosch Gmbh | Fuel injection valve |
| DE102005007329B3 (en) * | 2005-02-17 | 2006-09-21 | Siemens Ag | Fuel e.g. diesel, injection valve for vehicle`s internal combustion engine, has detection unit for detecting position of valve, and signal transmission connection with transformer operated according to transformator principle |
| EP1925813A1 (en) * | 2006-10-30 | 2008-05-28 | Robert Bosch Gmbh | Fuel injector with a measuring device |
| WO2010133423A1 (en) * | 2009-05-20 | 2010-11-25 | Robert Bosch Gmbh | Method for measuring the armature lift in a fuel injector |
| FR3024183A1 (en) * | 2014-07-22 | 2016-01-29 | Delphi Int Operations Luxembourg Sarl | FUEL INJECTOR |
| WO2016012242A1 (en) * | 2014-07-22 | 2016-01-28 | Delphi International Operations Luxembourg S.À R.L. | Fuel injector |
| EP3346124A1 (en) * | 2014-07-22 | 2018-07-11 | Delphi International Operations Luxembourg S.à r.l. | Fuel injector |
| US10502172B2 (en) | 2014-07-22 | 2019-12-10 | Delphi Technologies Ip Limited | Fuel injector with device for detecting needle position |
| WO2017072081A1 (en) * | 2015-10-29 | 2017-05-04 | Delphi International Operations Luxembourg S.À R.L. | Fuel injector |
| FR3043144A1 (en) * | 2015-10-29 | 2017-05-05 | Delphi Int Operations Luxembourg Sarl | FUEL INJECTOR |
| WO2017186819A1 (en) * | 2016-04-29 | 2017-11-02 | Delphi International Operations Luxembourg S.À R.L. | Fuel injector |
| FR3050771A1 (en) * | 2016-04-29 | 2017-11-03 | Delphi Int Operations Luxembourg Sarl | FUEL INJECTOR |
| CN111189381A (en) * | 2020-01-13 | 2020-05-22 | 中南大学 | Stratum lift detection device based on differential principle |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9817886D0 (en) | 1998-10-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0890730B1 (en) | Adjustable metering valve for an internal combustion engine fuel injector, and relative method of adjustment | |
| KR101092676B1 (en) | Electromagnetic pressure control valve device provided with an integrated pressure sensor | |
| US5395048A (en) | Fuel injector electromagnetic metering valve | |
| US5842640A (en) | Fuel injection valve for internal combustion engines | |
| US5775301A (en) | Fuel injection valve for internal combustion engines | |
| US5873526A (en) | Injection nozzle | |
| US6131829A (en) | Adjustable metering valve for an internal combustion engine fuel injector | |
| US6499669B2 (en) | Fuel injection valve for internal combustion engines | |
| US6892967B2 (en) | Fuel-injection valve for internal combustion engine | |
| US6918409B1 (en) | Spool and poppet inlet metering valve | |
| GB2340610A (en) | Needle lift sensor | |
| EP0937891B1 (en) | Fuel Injector | |
| US20030106533A1 (en) | Fuel injector with feedback control | |
| US5392995A (en) | Fuel injector calibration through directed leakage flux | |
| US7156368B2 (en) | Solenoid actuated flow controller valve | |
| US5311903A (en) | Apparatus for measuring the mechanical motion of a magnet valve armature for controlling fuel injection in a fuel injection system | |
| JPH02501337A (en) | Improved modulating hydraulic pressure control valve and its assembly method | |
| KR860008403A (en) | Solenoid valve device for high pressure fluid control with two valves arranged coaxially | |
| KR20010101955A (en) | Proportional control pressure valve | |
| EP2496823B1 (en) | Fuel injector | |
| EP2835520B1 (en) | Fuel injector and method for operating a fuel injector | |
| JPH03964A (en) | Electromotive fuel injection device for doesel engine | |
| US5004154A (en) | High pressure fuel injection device for engine | |
| JP4260228B2 (en) | Fuel injection valve for internal combustion engine | |
| US4427151A (en) | Fuel injector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |