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WO2017060076A1 - Procédé de détection d'un signal utile - Google Patents

Procédé de détection d'un signal utile Download PDF

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Publication number
WO2017060076A1
WO2017060076A1 PCT/EP2016/072305 EP2016072305W WO2017060076A1 WO 2017060076 A1 WO2017060076 A1 WO 2017060076A1 EP 2016072305 W EP2016072305 W EP 2016072305W WO 2017060076 A1 WO2017060076 A1 WO 2017060076A1
Authority
WO
WIPO (PCT)
Prior art keywords
variation
useful signal
signal
detecting
injector
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.)
Ceased
Application number
PCT/EP2016/072305
Other languages
German (de)
English (en)
Inventor
Matthias Scheid
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.)
Continental Automotive GmbH
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
Publication of WO2017060076A1 publication Critical patent/WO2017060076A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • F02D41/2438—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
    • 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
    • F02D2041/2051—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using voltage control
    • 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
    • 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
    • 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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators

Definitions

  • the present invention relates to a method for detecting a wanted signal which corresponds to a searched event.
  • the piezo element can be used in addition to its function as an actuator as a sensor. This can be used for
  • Example 2 pressure changes generated by the needle closing in a control volume can be measured under the servo valve. In the measured piezo voltage is then searched for this purpose, a specific useful signal of known form, which is caused by the needle shooting.
  • a specific useful signal of known form, which is caused by the needle shooting.
  • the useful signal is superimposed by interfering signals from various sources.
  • the piezoelectric element is excited by the control as an actuator (electrical charging and discharging processes) to oscillate, which can be found in its tension due to the electromechanical nature of the piezo.
  • too From the outside mechanical vibrations are transmitted to the piezo, for example in the form of structure-borne noise.
  • the present invention relates generally to a method for signal detection, the detection accuracy corresponding ge to be ⁇ increases in relation to a wanted signal despite the existence of interfering signals.
  • the useful signal to be detected can have any desired (but known) form and can be found in any desired measurement signal.
  • One application of this is, for example ector with piezo drive, it comes here to close from the measured piezo voltage on the exact time of the needle made a closing force ⁇ material servo Inj.
  • the present invention has for its object to provide a method of the type mentioned above, with a particularly high detection accuracy with respect to a useful signal despite the presence of interfering signals can be achieved.
  • a method for detecting a useful signal which corresponds to a searched event comprising the following steps: Identifying the payload;
  • the parameter variation is carried out by means of test points or by measuring , a range of variation is spanned that is large enough to adequately attenuate corresponding signal disturbances,
  • the method according to the invention is based on the use of a parameter variation, which exploits the fact that useful and interference signals have a different phase position, depending on the selected parameters.
  • the method can generally be used in a variety of areas for signal detection.
  • a particular application is the above-described determination of the time of needle closing of an injector. Especially with small injection quantities, the timing of Na ⁇ del structures is here very close to the earliest possible use of the
  • Piezo element as sensor (directly after unloading). For this reason, filtering with high / low / band pass filters ⁇ according to the prior art is not possible to the same extent as would be needed to bring the signal-to-noise ratio to a necessary for a robust detection level.
  • a useful signal is identified, which corresponds to the searched event. It is then determined a variation of one or more parameters for which one knows the temporal behavior of the useful signal on the variation or can determine by simple means.
  • This parameter variation must meet a number of criteria. It may only change the temporal position of the event / useful signal and must leave its form largely unchanged. You must be able to be carried out in practice, for example in the field of internal combustion engines, in particular by requesting test pulses or by a "Mit messenger" in the transient engine operation. In addition, they must have a variation ⁇ area span which is large enough to the known disturbances sufficiently The required width of the variation range depends on the relative phase shift between useful and interference signals, which can be achieved by the parameter variation.
  • the variation over the parameters x, y .. consists of a finite number of individual steps. For each of these steps, the corresponding signal is measured, in a time-fixed range [t eve nt ⁇ t_; t eve nt + t + ] around the event expected for a nominal injector at t eve nt ⁇
  • This requires knowledge of the instant t eve nt (X / y ⁇ ) for each individual step of the parameter variation, so that the time t x (x) t - tevent (x) can be determined.
  • t ⁇ [-t_; t + ] for each constant t x the average of all N individual measurements:
  • V Sl signal (t X ) 1 / N ⁇ ⁇ signal (t X ),
  • V s i gna i refers to a measured voltage signal when detecting the needle closing time at an In ⁇ jektor.
  • the useful signal can be found with the original amplitude from the above-mentioned mean value from all measurements, while interference signals were strongly attenuated by the averaging, resulting in a considerable improvement in the detectability of the useful signal.
  • the piezoelectric voltage in the region around the expected needle closing is measured by the ECU for detecting the needle closing in an injector and is available for further processing and evaluation.
  • a direct detection of the needle closing from the measured voltage is not possible without further processing of the measured signal.
  • the piezoelectric element is excited by the charging and discharging in each case to oscillations, which are reflected in its voltage due to the electromechanical nature of the piezoelectric element.
  • the absolute maximum in the derivative of the filtered voltage does not necessarily correspond to the needle closing time. It is precisely for this case that it is necessary to increase the signal-to-noise ratio by further processing of the signal, which is achieved with the method according to the invention.
  • V tot (t x ) the time derivative of the signal plotted as V tot (t x ) as a function of time t x and the requested amount MF has been calculated.
  • V tot ( ⁇ ⁇ ) is present as a time-discrete signal with a resolution of 5 ⁇ is present.
  • This maximum thus corresponds to the determined needle closing time offset of the examined injector compared to a nominal injector.
  • This systematic offset can now be corrected for all injections on this injector by means of an intervention in the actuation time of the injector in order to increase the accuracy of the injection quantity.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un procédé de détection d'un signal utile correspondant à un événement recherché. Dans ce procédé, la variation d'un ou de plusieurs paramètres est déterminée une fois le signal utile identifié. La variation du ou des paramètres est effectuée à l'appui d'impulsions d'essai ou par mesure concomitante. La valeur moyenne est formée à partir de toutes les mesures individuelles, et le signal utile est acquis à partir de la valeur moyenne formée. Ce procédé permet d'obtenir une précision de détection particulièrement élevée.
PCT/EP2016/072305 2015-10-07 2016-09-20 Procédé de détection d'un signal utile Ceased WO2017060076A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015219333.0A DE102015219333B3 (de) 2015-10-07 2015-10-07 Verfahren zur Detektion eines Nutzsignales
DE102015219333.0 2015-10-07

Publications (1)

Publication Number Publication Date
WO2017060076A1 true WO2017060076A1 (fr) 2017-04-13

Family

ID=56958936

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/072305 Ceased WO2017060076A1 (fr) 2015-10-07 2016-09-20 Procédé de détection d'un signal utile

Country Status (2)

Country Link
DE (1) DE102015219333B3 (fr)
WO (1) WO2017060076A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1519026A2 (fr) * 2003-09-29 2005-03-30 VW Mechatronic GmbH & Co. KG Méthode et dispositif de commande d'une soupape et méthode et dispositif de commande d'une pompe-injecteur avec soupape
WO2012065785A1 (fr) * 2010-11-16 2012-05-24 Continental Automotive Gmbh Procédé d'adaptation d'un injecteur d'un moteur à combustion interne
WO2014180655A1 (fr) * 2013-05-08 2014-11-13 Continental Automotive Gmbh Procédé pour déterminer le temps d'ouverture et/ou de fermeture de l'aiguille d'un injecteur de carburant

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT6511U3 (de) * 2003-07-16 2004-09-27 Avl List Gmbh Ultraschall-gasdurchflusssensor sowie vorrichtung zur messung von abgas-strömungen von verbrennungskraftmaschinen sowie ein verfahren zur ermittlung des durchflusses von gasen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1519026A2 (fr) * 2003-09-29 2005-03-30 VW Mechatronic GmbH & Co. KG Méthode et dispositif de commande d'une soupape et méthode et dispositif de commande d'une pompe-injecteur avec soupape
WO2012065785A1 (fr) * 2010-11-16 2012-05-24 Continental Automotive Gmbh Procédé d'adaptation d'un injecteur d'un moteur à combustion interne
WO2014180655A1 (fr) * 2013-05-08 2014-11-13 Continental Automotive Gmbh Procédé pour déterminer le temps d'ouverture et/ou de fermeture de l'aiguille d'un injecteur de carburant

Also Published As

Publication number Publication date
DE102015219333B3 (de) 2016-12-15

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