WO2016142109A1 - Procédé pour déterminer un point caractéristique du mouvement de levage d'un élément de fermeture d'un injecteur et système d'injection - Google Patents

Procédé pour déterminer un point caractéristique du mouvement de levage d'un élément de fermeture d'un injecteur et système d'injection Download PDF

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Publication number
WO2016142109A1
WO2016142109A1 PCT/EP2016/052387 EP2016052387W WO2016142109A1 WO 2016142109 A1 WO2016142109 A1 WO 2016142109A1 EP 2016052387 W EP2016052387 W EP 2016052387W WO 2016142109 A1 WO2016142109 A1 WO 2016142109A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
characteristic point
closure element
sensor
drive device
Prior art date
Application number
PCT/EP2016/052387
Other languages
German (de)
English (en)
Inventor
Anselm Schwarte
Original Assignee
Continental Automotive Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Continental Automotive Gmbh filed Critical Continental Automotive Gmbh
Priority to KR1020177024595A priority Critical patent/KR101972251B1/ko
Priority to CN201680015020.3A priority patent/CN107407220B/zh
Publication of WO2016142109A1 publication Critical patent/WO2016142109A1/fr

Links

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
    • F02D41/2451—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
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/28—Interface circuits
    • F02D2041/286—Interface circuits comprising means for signal processing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0618—Actual fuel injection timing or delay, e.g. determined from fuel pressure drop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/063—Lift of the valve needle

Definitions

  • the present invention relates to a method for determining a characteristic point of the lifting movement of a closure element of an injector, wherein the signal of a drive device for the closure element for detecting the characteristic point is used.
  • injection systems for internal combustion engines multiple injection patterns are usually carried out, sometimes with very short intervals.
  • the injection system must ensure a high quantity accuracy of the individual injections for this purpose. Another important aspect is the exact one
  • the prerequisite for such injection quantity control is the position detection of the closure element of the injector, i. the injection valve or the injection needle.
  • From DE 10 2011 082 455 B4 discloses a method for monitoring an injection quantity of a fluid is injected through an injection ⁇ nozzle, the injection nozzle is opened by a run in a reciprocating motion between a closed position and a lifting position closing element and is ge ⁇ closed, known.
  • this method four characteristic points of the stroke movement are detected. From the determined four characteristic points of the stroke movement, a calculation of the injection quantity takes place. To determine the characteristic points, a signal of the drive device for the closure element is used.
  • the signal of the drive device may preferably have a capacity
  • Voltage, a change in capacitance or a voltage change of the drive device include.
  • the capacitance signal of charge and voltage is formed to detect the opening and closing events of the injection valve.
  • the force of the injection needle on the drive device or the maximum force during closing can be detected as the minimum capacity in the capacitance signal. In this way, for example, the closing time can be determined.
  • the present invention has for its object to provide a method of the type described above, which allows a particularly accurate determination of a charac ⁇ teristic point of the lifting movement of the closure element.
  • This object is achieved in a method of the type indicated by the following steps: providing a signal of the drive device for the characteristic point;
  • Equal status with corresponding accuracy gain The signal characteristics of the minimum or maximum are standardized or only made possible.
  • the procedure according to the invention of tilting the signal provided in the evaluation window by a certain amount leads to a significant improvement in the determination of a characteristic point of the lifting movement of the closure element.
  • the influence of interference can also be greatly minimized with the method according to the invention. Corresponding measurement errors can thus be almost eliminated with respect to the detection result.
  • the closing time of the closure element is determined as a characteristic point.
  • the method according to the invention uses a piezoactuator as the drive device.
  • Piezo actuator can also be used as a sensor to detect the characteristic point.
  • a voltage and charge measurement is carried out, from which a corresponding capacitance signal is determined, which can then be evaluated in the manner according to the invention.
  • the method according to the invention likewise leads to an elimination of uncertainties.
  • the force signal is very sensitive with respect to parameter changes of the drive device, in particular a piezo actuator.
  • a temperature variation or the resulting from ⁇ parameters passed lead to different waveforms.
  • Applying the method according to the invention to the force signal results in a significant gain in informative value.
  • the maximum is stable at the same position with almost the same expression.
  • the normalization carried out according to the invention therefore leads to an evaluable and constant maximum position. n
  • the capacitance signal can no longer be meaningfully evaluated because it is divided by the piezo voltage.
  • the signal provided is normalized to a nominal signal slope of zero.
  • the capacity profile is normalized to a slope of zero.
  • the piezo capacitance is adjusted by the piezohysteresis, and the force effects are approximately constant, so that a slope of zero results.
  • the invention further relates to an injection system having at least one Inj ector, a control device and a computing unit, wherein the injector a closure element for closing and opening an injection nozzle, a drive device for guiding the closure element in a lifting movement and a sensor for detecting the characteristic point of the lifting movement of the Has closure element.
  • the senor is set up to provide a signal to the characteristic point drive device, and the arithmetic unit is configured to calculate a regression line for the provided signal, to calculate the desired signal slope, to tilt the provided signal to the desired signal slope to detect a minimum or maximum of the tilted signal and to determine the characteristic point from the minimum or maximum.
  • the intended sensor provides the signal of the drive ⁇ device for the characteristic point, and the computing unit evaluates this signal in the inventive manner, so that a reliable and accurate determination of the character- teristic point of the lifting movement of the closure element is possible.
  • the sensor is preferably configured to provide a signal for the closing time of the closure element.
  • the detected closing time signal can therefore also be evaluated for small signal values.
  • the drive device is preferably a piezoactuator, which also preferably simultaneously acts as a sensor. In this way, a signal detection without additional facilities is possible.
  • Preferred signal quantities are a capacitance signal and a force signal.
  • the sensor is preferably a voltage signal and a charge signal to the drive device ⁇ ready and determines from a capacitance signal.
  • a capacitance signal can also be provided directly via a capacitance sensor.
  • the sensor provides a force signal of the drive device.
  • the arithmetic unit is preferably set up in such a way that it normalizes the signal provided to a desired signal slope of 0.
  • Figure 1 is a schematic representation of an injection ⁇ system
  • Figure 2 shows the time course of the lifting movement of a Closure element of the injection nozzle shown in Figure 1;
  • FIG. 3 shows the tilt of the capacitance signal on the
  • FIG. 4 shows the tilting of the force signal
  • FIG. 6 shows in the upper illustration the force output signal and in the lower illustration the force signal after machining according to the invention.
  • FIG. 1 shows in a block diagram a schematic view of an injection system 1 for injecting an injection quantity of a fluid.
  • the injection system 1 comprises a STEU ⁇ ervoriques 2 and an injection nozzle 3 and a computing unit 4.
  • the injection nozzle 3 has a closure element 7, in the illustrated embodiment, a nozzle needle which rests in a nozzle needle seat, a drive device 5 and a sensor 6.
  • the drive device 5 a piezo actuator, which by application of a voltage changes the shape of a piezo crystal contained therein, and thus lifting the closure element 7 ⁇ or lowers, so the closure element 7 into a reciprocating motion.
  • the closure element 7 is for this purpose rigidly connected to the drive device 5 and is pressed by a spring 9 by a conversion 10 of the injection nozzle 3 down, so that the closure element 7 in the idle state, ie without actuation of the drive device 5, the injection nozzle 3, more precisely, the holes 11 of the injection nozzle 3, closes.
  • the sensor 6 is a capacitance sensor having two parallel plates mounted on opposite sides of the shutter member 7. If the closure element 7 is moved by the drive device, the capacitance measured by the sensor 6 changes.
  • the sensor 6 is in this case mounted directly on the drive device 5 or may also be part of the drive device 5. Instead of a capacitance sensor, it is also possible to provide a sensor for measuring the voltage of the piezoactuator.
  • the voltage as a signal of the piezo actuator can be easily determined, with the knowledge of the charge of the piezo actuator, for example via an applied current, the capacity can also be determined in addition.
  • the sensor 6 can also be set up to qualitatively and quantitatively detect changes in the measured quantity mentioned.
  • the piezoactuator simultaneously acts as a sensor which detects the voltage and charge and derives a capacitance signal therefrom.
  • the sensor 6 detected by the timing of the capacity characteristic points of the stroke movement of the locking element 7.
  • the ⁇ Ver measured by the sensor 6 and the capacitance characteristic points are transmitted via a line 8 to the arithmetic unit 4, which performs a corresponding Sig ⁇ nalausificat ,
  • FIG. 2 shows the time course of the lifting movement of the nozzle needle.
  • OPP_l characteristic points
  • OPP_2 represented OPP_3 and OPP_4 that the needle opening ⁇ time, the maximum opening point, the beginning of the Close closing and the closing time correspond.
  • the following text describes the determination of the closing time as a characteristic point.
  • OPP_4 For detection of the closing timing (OPP_4) is detected by the sensor, the charge and voltage signal, from which the capacitance signal is calculated by Re ⁇ unit area.
  • the force ⁇ action of the closure element (the injection needle) on the drive device (the piezoelectric actuator) and the maximum force during closing can be detected as a minimum capacitance in the capacitance signal.
  • the closing time (OPP_4) is then known.
  • FIG. 3 shows the voltage signal 20 in the upper illustration and the charge signal 21 in the middle representation. From this, the capacitance signal 22 is determined. Regarding this signal, a regression line 23 is calculated and the signal is tilted to the expected slope of the signal. This normalization of the closing signal leads to a significant equal position with a corresponding gain in accuracy. The signal characteristic of the minimum is unified or until he ⁇ made possible. The piezo capacitance is adjusted for the piezohysteresis, and the force effects are approximately constant or the signal slope is zero. The capacity curve is therefore normalized to a slope of zero. The corresponding normalized capacity curve is shown at 24.
  • the capacitance signal can no longer be meaningfully evaluated. Especially then the force signal for detecting the closing time is advantageous.
  • FIG. 4 shows the tilting of the force signal for detecting the closing time.
  • FIG. 5 shows the signal processing performed with a capacitance signal.
  • the capacitance output signal is shown, while below the signal is shown after processing according to the invention. It can be seen that the minimum required corresponds to the closing time (OPP_4).
  • FIG. 6 shows the signal conditioning of the force signal. Above the force output signal is shown with strong dependence on the piezo parameters taken ⁇ . Below is the force signal to recognize after processing with the method according to the invention. The clearly pronounced maximum corresponds to the
  • Figure 7 shows a flow diagram according to the invention led Runaway ⁇ signal processing by toggling the signal to the desired pitch in the evaluation.
  • the closing timing signal of the injection valve is determined as a capacitance or force signal.
  • the calculation of the associated regression line takes place.
  • the injection parameters injection quantity, injector temperature and rail pressure are determined, from which the desired signal slope is calculated in step 53.
  • step 54 the capacitance or force signal is tipped to the desired signal slope.
  • step 55 the detection of the minimum or the maximum in the tilted signal and from this the calculation of the closing time takes place.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

L'invention concerne un procédé pour déterminer un point caractéristique du mouvement de levage d'un élément de fermeture d'un injecteur et un système d'injection. Le signal d'un dispositif d'entraînement pour l'élément de fermeture est utilisé pour détecter le point caractéristique, et un traitement spécial de ce signal a lieu. Le signal délivré est basculé pour atteindre la pente du signal attendue, et un minimum ou un maximal du signal basculé est fixé afin de pouvoir déterminer le point caractéristique du mouvement de levage de l'élément de fermeture. Le système d'injection présente un capteur, qui est conçu pour délivrer un signal du dispositif d'entraînement pour le point caractéristique, ainsi qu'une unité de calcul, qui est conçue pour réaliser un traitement spécial du signal.
PCT/EP2016/052387 2015-03-11 2016-02-04 Procédé pour déterminer un point caractéristique du mouvement de levage d'un élément de fermeture d'un injecteur et système d'injection WO2016142109A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020177024595A KR101972251B1 (ko) 2015-03-11 2016-02-04 인젝터의 폐쇄 부재의 왕복 운동의 특성점을 결정하기 위한 방법, 및 분사 시스템
CN201680015020.3A CN107407220B (zh) 2015-03-11 2016-02-04 用于获取喷射器的闭锁元件的往复运动的特征点的方法和喷射系统

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015204397.5A DE102015204397B4 (de) 2015-03-11 2015-03-11 Verfahren zum Ermitteln eines charakteristischen Punktes der Hubbewegung eines Verschlusselementes eines Injektors und Einspritzsystem
DE102015204397.5 2015-03-11

Publications (1)

Publication Number Publication Date
WO2016142109A1 true WO2016142109A1 (fr) 2016-09-15

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Country Status (4)

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KR (1) KR101972251B1 (fr)
CN (1) CN107407220B (fr)
DE (1) DE102015204397B4 (fr)
WO (1) WO2016142109A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102020105287A1 (de) 2020-02-28 2021-09-02 Bayerische Motoren Werke Aktiengesellschaft Verfahren zum Bestimmen eines Mittelwerts von Druckschwingung in einem Kraftstoffniederdrucksystem für ein Kraftfahrzeug, computerlesbares Speichermedium sowie Kraftstoffniederdrucksystem

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DE102006059070A1 (de) * 2006-12-14 2008-06-19 Robert Bosch Gmbh Kraftstoffeinspritzsystem und Verfahren zum Ermitteln eines Nadelhubanschlags in einem Kraftstoffeinspritzventil
DE102008001560A1 (de) * 2008-05-05 2009-11-12 Robert Bosch Gmbh Verfahren und Vorrichtung zum Ermitteln eines Endzeitpunkts einer Kraftstoffeinspritzung
DE102008023373A1 (de) * 2008-05-13 2009-11-19 Continental Automotive Gmbh Verfahren zum Steuern eines Einspritzventils, Kraftstoff-Einspritzanlage und Verbrennungsmotor
DE102009000741A1 (de) * 2009-02-10 2010-08-12 Robert Bosch Gmbh Verfahren zum Bestimmen eines Nadelschließens
DE102010021169A1 (de) * 2010-05-21 2011-11-24 Continental Automotive Gmbh Verfahren und Vorrichtung zur Ermittlung des tatsächlichen Einspritzbeginns eines Piezo-Kraftstoff-Einspritzventils
WO2014174916A1 (fr) * 2013-04-26 2014-10-30 日立オートモティブシステムズ株式会社 Unité de commande de vanne électromagnétique et dispositif de commande de moteur à combustion interne utilisant celle-ci

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DE102010001257A1 (de) * 2010-01-27 2011-07-28 Robert Bosch GmbH, 70469 Verfahren und Steuervorrichtung zur Bestimmung einer zukünftigen Drehzahl
DE102011076258A1 (de) * 2011-05-23 2012-11-29 Robert Bosch Gmbh Verfahren zum Betreiben einer Brennkraftmaschine
DE102011082455B4 (de) * 2011-09-09 2014-02-13 Continental Automotive Gmbh Verfahren zum Überwachen einer Einspritzmenge eines Fluids sowie Einspritzsystem zum Einspritzen einer Einspritzmenge eines Fluids
JP5541535B2 (ja) * 2011-09-13 2014-07-09 日立オートモティブシステムズ株式会社 内燃機関の燃料噴射制御装置
DE102013206600B4 (de) * 2013-04-12 2015-08-06 Continental Automotive Gmbh Einspritzsystem zum Einspritzen von Kraftstoff in eine Brennkraftmaschine und Regelverfahren für ein solches Einspritzsystem

Patent Citations (7)

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Publication number Priority date Publication date Assignee Title
DE102006059070A1 (de) * 2006-12-14 2008-06-19 Robert Bosch Gmbh Kraftstoffeinspritzsystem und Verfahren zum Ermitteln eines Nadelhubanschlags in einem Kraftstoffeinspritzventil
DE102008001560A1 (de) * 2008-05-05 2009-11-12 Robert Bosch Gmbh Verfahren und Vorrichtung zum Ermitteln eines Endzeitpunkts einer Kraftstoffeinspritzung
DE102008023373A1 (de) * 2008-05-13 2009-11-19 Continental Automotive Gmbh Verfahren zum Steuern eines Einspritzventils, Kraftstoff-Einspritzanlage und Verbrennungsmotor
DE102009000741A1 (de) * 2009-02-10 2010-08-12 Robert Bosch Gmbh Verfahren zum Bestimmen eines Nadelschließens
DE102010021169A1 (de) * 2010-05-21 2011-11-24 Continental Automotive Gmbh Verfahren und Vorrichtung zur Ermittlung des tatsächlichen Einspritzbeginns eines Piezo-Kraftstoff-Einspritzventils
WO2014174916A1 (fr) * 2013-04-26 2014-10-30 日立オートモティブシステムズ株式会社 Unité de commande de vanne électromagnétique et dispositif de commande de moteur à combustion interne utilisant celle-ci
EP2990705A1 (fr) * 2013-04-26 2016-03-02 Hitachi Automotive Systems, Ltd. Unité de commande de vanne électromagnétique et dispositif de commande de moteur à combustion interne utilisant celle-ci

Also Published As

Publication number Publication date
DE102015204397B4 (de) 2017-06-08
KR20170107573A (ko) 2017-09-25
DE102015204397A1 (de) 2016-09-15
CN107407220A (zh) 2017-11-28
KR101972251B1 (ko) 2019-04-24
CN107407220B (zh) 2020-10-16

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