WO2015189059A1 - Verfahren zur charakterisierung eines hydraulischen koppelelementes eines piezo-injektors - Google Patents
Verfahren zur charakterisierung eines hydraulischen koppelelementes eines piezo-injektors Download PDFInfo
- Publication number
- WO2015189059A1 WO2015189059A1 PCT/EP2015/062092 EP2015062092W WO2015189059A1 WO 2015189059 A1 WO2015189059 A1 WO 2015189059A1 EP 2015062092 W EP2015062092 W EP 2015062092W WO 2015189059 A1 WO2015189059 A1 WO 2015189059A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- piston
- coupling element
- piezo actuator
- pin
- piezo
- Prior art date
Links
- 230000008878 coupling Effects 0.000 title claims abstract description 32
- 238000010168 coupling process Methods 0.000 title claims abstract description 32
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000007599 discharging Methods 0.000 claims description 3
- 230000004913 activation Effects 0.000 abstract description 3
- 239000000446 fuel Substances 0.000 description 12
- 238000002347 injection Methods 0.000 description 10
- 239000007924 injection Substances 0.000 description 10
- 239000012530 fluid Substances 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D41/2096—Output circuits, e.g. for controlling currents in command coils for controlling piezoelectric injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
- F02D41/2425—Particular ways of programming the data
- F02D41/2429—Methods of calibrating or learning
- F02D41/2438—Active learning methods
-
- 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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
- F02D41/2425—Particular ways of programming the data
- F02D41/2429—Methods of calibrating or learning
- F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
- F02D41/2464—Characteristics of actuators
- F02D41/2467—Characteristics of actuators for injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/042—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
- H02N2/04—Constructional details
- H02N2/043—Mechanical transmission means, e.g. for stroke amplification
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
- H02N2/06—Drive circuits; Control arrangements or methods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
- F02D2041/2055—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit with means for determining actual opening or closing time
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
- F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
- F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
Definitions
- the present invention relates to a method for characterizing a piston which pressurizes a hydraulic fluid and has a hydraulic coupling element having a pin connected to a piezo actuator, which converts the translational stroke of the piezo actuator into a pressure difference opening the nozzle needle of a piezo injector ,
- a new generation of fuel injection systems in particular ⁇ special common rail fuel injection systems, operates with directly driven piezo injectors, which actuate the nozzle needle via a hydraulic coupling element.
- the coupling element converts the translatory stroke of the piezo drive into a pressure difference which opens the nozzle needle.
- the coupling ⁇ element comprises a piston and this with a
- Piezo actuator connecting pin The piston is in a pressure cylinder. Due to the lengthening of the piezo actuator is in the pressure cylinder befindaji, standing under high pressure
- the transmission properties of such a coupling element are highly dependent on the physical characteristics of the fuel from the leakage fluid streams on the coupling element. It turns a balance of in, out and around Quantities, which hold the respective dynamic effetsver ⁇ and thus affects the needle opening and closing. This balance changes as a function of temperature, viscosity, component tolerance and aging, ie gap cross-section. To provide a correction of the drive, it is interesting to know the state of this balance.
- the present invention has for its object to provide a method of the type reproduced above, with a particularly accurate control of the
- the coupling element is subjected to a test drive.
- This test activation takes place in such a way that the piezoactuator is moved so slowly by a very small charging current that the resulting leakage flow prevents a pressure difference and thus the nozzle needle remains closed. Then the piezo actuator is discharged by a large current.
- the fast movement of the piezoelectric actuator, the piston of the coupling element can not follow at the same speed, so that the mechanical connection between the piston and pin is released.
- the piston follows at subdued speed, which is limited by the ability to equalize the volumes of fluid in front of and behind the piston.
- a signal is generated by the force acting on the piezoelectric element, which can be detected as a change in capacitance or voltage or current.
- thermohydraulic and tribological state of the coupling element The time from the start of unloading to the impact of the piston characterizes the thermohydraulic and tribological state of the coupling element and is used to characterize the coupling element.
- the measured period is therefore used as an indication of the state of the coupling element.
- a relatively high period of wear of the coupling element is present, since there is a relatively large gap between the pressure cylinder wall and piston and thus there is a relatively strong flow around the piston.
- the wear of the piston is relatively low, since the Umströ- mungsspalt is small.
- the measured time is used to monitor the wear of Koppele ⁇ Mentes.
- a further variant of the method according to the invention is characterized in that the measured time is used to correct the activation of the piezoinjector.
- Figure 1 is a schematic representation of a via a
- Figure 3 is a schematic representation as Figure 1, showing the piezo actuator in the extended state without movement of the nozzle needle;
- Figure 4 is a representation corresponding to Figure 3, the
- Piezo actuator in the contracted state with a damped return movement of the piston shows.
- the injector shown schematically in Figure 1 may for example be part of a pressure accumulator (rail) having injection system of a motor vehicle.
- the injector has a nozzle needle 7, which opens an injection port 8 and n
- a spring 9 pushes down the nozzle needle 7 in the figure to close the injection port 8.
- High pressure fuel is supplied via line 5. About ⁇ the pressure of the fuel increases the pressure exerted by the spring 9, the nozzle needle 7 in the figure is moved upward to open the injection hole 8 and to inject a metered force ⁇ amount of fuel into a combustion chamber. If the fuel pressure drops, the injection opening 8 is closed by the action of the spring 9 again from the nozzle needle 7.
- the drive of the injector takes place via a piezoelectric actuator 1 and a coupling element that converts the translational stroke of the piezoelectric actuator 1 into a pressure difference opening the nozzle needle.
- the piezo-actuator 1 is connected via a pin 2 with a piston 3 in connection, which has a loose mechanical coupling with the pin 2.
- the piston 3 moves in a pressure cylinder 6, in which a spring 4 is arranged.
- the piezoelectric actuator 1 By extending the piezoelectric actuator 1, the piston 3 is moved via the pin 2 against the force of the spring 4 in the figure down and sets the flowing via the line 5 fuel under pressure, so that the nozzle needle 7 opens the injection port 8 and a corresponding amount of fuel is injected.
- At 10 between a pressure cylinder 6 and the piston surface existing gap 10 is shown, through which a leakage current flows past the piston. A corresponding leakage flow flows via the gap 11 past the nozzle needle into the associated coupling space.
- a test drive of the piezo-actuator 1 is performed.
- the piezoelectric actuator 1 is acted upon by a very small charging current, so that it moves so slowly that the resulting leakage flow of the coupling element prevents a pressure difference and thus the nozzle needle 7 remains closed. This state is shown in FIG. .
- the piezo-actuator 1 is discharged by a very large current, so that the mechanical connection between the piston 3 and pin 2 is released. This is due to the fact that the piston 3 can not follow the rapid movement of the piezo actuator 1 at the same speed. This condition is shown in FIG.
- the piston 3 follows rather with damped speed. Upon impact of the piston 3 on the pin 2, a signal is generated by the force acting on the piezoelectric element, which is detected, for example, as a change in capacitance. It is then the time from the start of discharge to the impact of the piston 3 is measured on the pin 2, and this time is used to characterize the coupling element.
- Figure 2 shows the drive profile for the test drive of the piezo actuator. It is on the ordinate of the current and on the
- Abscissa represents the time. At 20 is a typical
- the wear of the coupling element or piston 3 can be detected. If the time is relatively low, the flow around the piston 3 is relatively large, so that the wear can be classified as high. On the other hand, if the measured time is large, it can be assumed that there is little flow around and thus little wear.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201580031749.5A CN106460702A (zh) | 2014-06-13 | 2015-06-01 | 用于表征压电喷射器的液压联接元件的方法 |
KR1020167034811A KR101938954B1 (ko) | 2014-06-13 | 2015-06-01 | 압전 분사기의 유압 커플링 요소의 특성을 나타내기 위한 방법 |
US15/316,627 US10018138B2 (en) | 2014-06-13 | 2015-06-01 | Method for operating a piezo injector |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014211334.2A DE102014211334B3 (de) | 2014-06-13 | 2014-06-13 | Verfahren zur Charakterisierung eines hydraulischen Koppelelementes eines Piezo-Injektors |
DE102014211334.2 | 2014-06-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015189059A1 true WO2015189059A1 (de) | 2015-12-17 |
Family
ID=53274541
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2015/062092 WO2015189059A1 (de) | 2014-06-13 | 2015-06-01 | Verfahren zur charakterisierung eines hydraulischen koppelelementes eines piezo-injektors |
Country Status (5)
Country | Link |
---|---|
US (1) | US10018138B2 (de) |
KR (1) | KR101938954B1 (de) |
CN (1) | CN106460702A (de) |
DE (1) | DE102014211334B3 (de) |
WO (1) | WO2015189059A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10018138B2 (en) | 2014-06-13 | 2018-07-10 | Continental Automotive Gmbh | Method for operating a piezo injector |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017220912B3 (de) | 2017-11-23 | 2018-08-09 | Continental Automotive Gmbh | Verfahren und Vorrichtung zur Ermittlung des Öffnungszeitpunktes des Servoventils eines Piezoinjektors |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19939520A1 (de) * | 1999-08-20 | 2001-03-01 | Bosch Gmbh Robert | Einspritzsystem und Verfahren zum Betreiben eines Einspritzsystems |
EP1394397A2 (de) * | 2002-08-29 | 2004-03-03 | Robert Bosch Gmbh | Verfahren zum Betreiben eines Kraftstoffeinspritzsystems, sowie Steuer- und/oder Regelgerät zum Betreiben eines Kraftstoffeinspritzsystems |
WO2005098229A1 (de) * | 2004-04-08 | 2005-10-20 | Robert Bosch Gmbh | Einspritzdüse |
DE102007059117A1 (de) * | 2007-12-07 | 2009-06-10 | Robert Bosch Gmbh | Verfahren zum Betreiben eines Einspritzventils |
US20110272499A1 (en) * | 2010-05-07 | 2011-11-10 | Caterpillar Inc. | Hydraulically amplified mechanical coupling |
DE102011003751A1 (de) * | 2011-02-08 | 2012-08-09 | Continental Automotive Gmbh | Einspritzvorrichtung |
Family Cites Families (15)
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DE10326259A1 (de) * | 2003-06-11 | 2005-01-05 | Robert Bosch Gmbh | Injektor für Kraftstoff-Einspritzsysteme von Brennkraftmaschinen, insbesondere von direkteinspritzenden Dieselmotoren |
DE10333696A1 (de) * | 2003-07-24 | 2005-02-24 | Robert Bosch Gmbh | Kraftstoffeinspritzvorrichtung |
DE10333697A1 (de) * | 2003-07-24 | 2005-02-24 | Robert Bosch Gmbh | Kraftstoffeinspritzvorrichtung |
DE102004005456A1 (de) * | 2004-02-04 | 2005-08-25 | Robert Bosch Gmbh | Kraftstoffinjektor mit direktgesteuertem Einspritzventilglied |
DE102005004738A1 (de) * | 2005-02-02 | 2006-08-10 | Robert Bosch Gmbh | Kraftstoffinjektor mit direkter Nadelsteuerung für eine Brennkraftmaschine |
DE102005054739B4 (de) * | 2005-11-17 | 2017-06-08 | Robert Bosch Gmbh | Injektor zur Einspritzung von Kraftstoff in Brennräume von Brennkraftmaschinen, insbesondere piezoaktorgesteuerter Common-Rail-Injektor |
JP4428357B2 (ja) * | 2006-04-03 | 2010-03-10 | 株式会社デンソー | 燃料噴射弁 |
JP4782718B2 (ja) * | 2007-03-26 | 2011-09-28 | 株式会社日本自動車部品総合研究所 | 燃料噴射制御装置及び燃料噴射装置 |
JP4386928B2 (ja) * | 2007-04-04 | 2009-12-16 | 株式会社デンソー | インジェクタ |
JP4475331B2 (ja) * | 2008-01-10 | 2010-06-09 | 株式会社デンソー | 燃料噴射装置 |
JP4662292B2 (ja) * | 2008-07-14 | 2011-03-30 | 株式会社日本自動車部品総合研究所 | 燃料噴射装置 |
DE102010021169B4 (de) * | 2010-05-21 | 2012-03-08 | Continental Automotive Gmbh | Verfahren und Vorrichtung zur Ermittlung des tatsächlichen Einspritzbeginns eines Piezo-Kraftstoff-Einspritzventils |
DE102011007393B3 (de) * | 2011-04-14 | 2012-09-13 | Continental Automotive Gmbh | Verfahren zur Detektion eines Düsenraumdrucks in einem Injektor und Einspritzsystem |
DE102011007580A1 (de) * | 2011-04-18 | 2012-10-18 | Robert Bosch Gmbh | Verfahren zum Betreiben eines Einspritzventils |
DE102014211334B3 (de) | 2014-06-13 | 2015-08-27 | Continental Automotive Gmbh | Verfahren zur Charakterisierung eines hydraulischen Koppelelementes eines Piezo-Injektors |
-
2014
- 2014-06-13 DE DE102014211334.2A patent/DE102014211334B3/de not_active Expired - Fee Related
-
2015
- 2015-06-01 US US15/316,627 patent/US10018138B2/en not_active Expired - Fee Related
- 2015-06-01 CN CN201580031749.5A patent/CN106460702A/zh active Pending
- 2015-06-01 WO PCT/EP2015/062092 patent/WO2015189059A1/de active Application Filing
- 2015-06-01 KR KR1020167034811A patent/KR101938954B1/ko active IP Right Grant
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19939520A1 (de) * | 1999-08-20 | 2001-03-01 | Bosch Gmbh Robert | Einspritzsystem und Verfahren zum Betreiben eines Einspritzsystems |
EP1394397A2 (de) * | 2002-08-29 | 2004-03-03 | Robert Bosch Gmbh | Verfahren zum Betreiben eines Kraftstoffeinspritzsystems, sowie Steuer- und/oder Regelgerät zum Betreiben eines Kraftstoffeinspritzsystems |
WO2005098229A1 (de) * | 2004-04-08 | 2005-10-20 | Robert Bosch Gmbh | Einspritzdüse |
DE102007059117A1 (de) * | 2007-12-07 | 2009-06-10 | Robert Bosch Gmbh | Verfahren zum Betreiben eines Einspritzventils |
US20110272499A1 (en) * | 2010-05-07 | 2011-11-10 | Caterpillar Inc. | Hydraulically amplified mechanical coupling |
DE102011003751A1 (de) * | 2011-02-08 | 2012-08-09 | Continental Automotive Gmbh | Einspritzvorrichtung |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10018138B2 (en) | 2014-06-13 | 2018-07-10 | Continental Automotive Gmbh | Method for operating a piezo injector |
Also Published As
Publication number | Publication date |
---|---|
KR101938954B1 (ko) | 2019-04-10 |
CN106460702A (zh) | 2017-02-22 |
US20170138290A1 (en) | 2017-05-18 |
KR20170002631A (ko) | 2017-01-06 |
DE102014211334B3 (de) | 2015-08-27 |
US10018138B2 (en) | 2018-07-10 |
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