WO2008028849A1 - Procédé et dispositif de correction de la durée d'injection dans un moteur a combustion interne - Google Patents

Procédé et dispositif de correction de la durée d'injection dans un moteur a combustion interne Download PDF

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Publication number
WO2008028849A1
WO2008028849A1 PCT/EP2007/058992 EP2007058992W WO2008028849A1 WO 2008028849 A1 WO2008028849 A1 WO 2008028849A1 EP 2007058992 W EP2007058992 W EP 2007058992W WO 2008028849 A1 WO2008028849 A1 WO 2008028849A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
injection
determined
fuel
correction value
Prior art date
Application number
PCT/EP2007/058992
Other languages
German (de)
English (en)
Inventor
Julian Baumann
Jürgen FRITSCH
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 WO2008028849A1 publication Critical patent/WO2008028849A1/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
    • F02D41/30—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
    • 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
    • F02D2041/288—Interface circuits comprising means for signal processing for performing a transformation into the frequency domain, e.g. Fourier transformation
    • 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
    • F02D2200/0602—Fuel pressure
    • F02D2200/0604—Estimation of fuel pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/04—Fuel pressure pulsation in common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/31—Control of the fuel pressure

Definitions

  • the invention relates to a method for determining the correction of the injection quantity of a subsequent injection of fuel in an internal combustion engine according to the preamble of claim 1. Furthermore, the invention relates to a device for correcting the injection quantity in an internal combustion engine according to the preamble of claim 11 and a method for correction the injection amount of a subsequent injection of fuel into an internal combustion engine according to the preamble of claim 7.
  • DE 103 16 811 A1 also proposes a method for determining the injection duration and a method for determining correction values for the injection behavior of an injection valve.
  • the injection time period ⁇ ⁇ will be true of a map value and a correction value.
  • the map value is read out depending on the fuel pressure ⁇ and depending on the fuel mass to be injected from a map.
  • the correction value is calculated as a function of the time interval between the following injection and at least one last injection.
  • Object of the present invention is therefore to propose a method and a device for correcting the injection amount in an internal combustion engine with which a require derliche correction for the injection quantity can be precisely as possible it ⁇ averages and with which the in the following inputs spraying necessary fuel quantity can be corrected.
  • This object is achieved by a method for determining the correction of the injection quantity of a subsequent injection of fuel into an internal combustion engine with the features according to claim 1.
  • the object of an injection quantity correction apparatus in an internal combustion engine having a fuel line having the features of claim 11 and a method of correcting the injection quantity is to simulate subsequent injection of fuel into an internal combustion engine having the features Claim 7 solved.
  • the fuel pressure in the high-pressure fuel line of an internal combustion engine is determined between two consecutive injection processes in one cylinder stroke.
  • the injection duration depends for each injection by the fuel pressure and the fuel injection quantity, and and the injection period will ever ⁇ wells determined from a map value and a correction value.
  • the correction value is thereby determined by detecting the pressure in the fuel line as a pressure function as a function of the time between two injections. Parameter values are then ermit ⁇ telt from the print function from which the space required for the next injection correction value is determined.
  • the pressure as a function of time is determined with a pressure sensor, which is arranged in a preferred embodiment of the invention on the outside of the fuel line, in particular concentrically around the fuel line.
  • a non-invasive sensor such as a magnetoelastic sensor is used. This one has the advantage that it can be easily mounted without interference with the fuel line.
  • the pressure sensor is attached to a position suitable for the shape of the sensor on the high-pressure fuel line close to the injection valve, since this ensures that the strength of the detected signal is sufficiently high.
  • the required correction values can then be determined from the pressure signal by deriving parameters.
  • the amplitude and the phase of the time profile of the pressure can be determined from the pressure signal. These are in turn used to calculate the correction value, whereby the corresponding values of the stored characteristic map are taken into account in the calculation.
  • the determined correction value is usually a time value which is added to the nominal value of the injection valve energization time for the next injection. While reducing negative correction values, the energization duration, according to the duration of injection and the injection quantity of the fuel ⁇ substance. Thus, the correction is made by a time correction value for the duration of the control of the injection valve.
  • FIG. 1 shows schematically an inventive fuel injection system
  • Fig. 1 shows schematically the structure of a Kraftstoffein- injection system for an internal combustion engine.
  • Fuel is sucked through a fuel ⁇ line 11 from a pre-feed pump 12 and conveyed via egg NEN fuel filter 13 to a high-pressure pump 15 from a power ⁇ fuel reservoir 10th
  • a high-pressure pump 15 from a power ⁇ fuel reservoir 10th
  • the fuel flow into the high-pressure accumulator 17 can be controlled as required via a suction throttle valve 14 in accordance with the respective operating conditions.
  • a pressure accumulator sensor 23 is provided, which is connected to an electrical line 19 with an electronic control unit 28.
  • the electronic control unit 28 controls ⁇ and / or controls all the operation of the internal combustion engine necessary processes, to which end all erfor ⁇ sary units and sensors connected to the control unit 28th
  • a control line 22 is also provided which connects the suction throttle valve 14 to the control unit 28.
  • the holding pressure of a pressure control valve 16 can be adjusted via a control line 24 taking into account the data of the pressure storage sensor 23.
  • Excess fuel can be injected via the return line. tion 25 back into the fuel tank 10 are derived.
  • a high fuel pressure of, for example, 1800 bar is generated with this pressure control device.
  • This under high pressure fuel is applied via a high-pressure line 27 to the injection valves 18, which are each zugeord ⁇ net a combustion chamber of the internal combustion engine.
  • the injection process is triggered and controlled by the control unit 28 via a control line 26.
  • the start of injection and the injection period of the respective injection is determined.
  • a leakage line 21 ensures that possibly occurring leakage flows of fuel can be returned to the fuel storage tank 10.
  • a plurality of injections are carried out in a combustion chamber for a combustion process, that is to say for one combustion stroke of a cylinder stroke, with the result that the fuel consumption and the emission are reduced.
  • a pressure sensor 20 is provided according to the invention. The measured values obtained with the pressure sensor 20 are supplied to the control unit 28 with the aid of a control line 29.
  • sensors in principle, those can be used which can detect the applied pressure with sufficient dynamics.
  • sensors are required which can detect a pressure of 1800 bar with a dynamics of at least 3 kHz.
  • Such sensors may be, for example piezoresistive sensors, which al ⁇ lerdings direct contact with the medium, that need the fuel. These must therefore be introduced directly into the high-pressure line 27, for example by drilling. It must however be noted that a safe Mon ⁇ day of the pressure sensor 20 in the high pressure line 27 as well is guaranteed, as their tightness at the required pressure of up to 2700 bar.
  • a magnetoelastic sensor is used as the pressure sensor 20.
  • Such sensors operate non-invasively and can therefore be mounted on the outside of the high-pressure line 27 without tapping the high-pressure line 27. Thus, no interference takes place in the hydraulic system, although a sufficient measurement accuracy is nevertheless ensured. In addition ⁇ this type of sensor over the piezoresistive sensors cheaper or cheaper.
  • the pressure sensor 20 it is attached as close as possible to the injection valve 18. For the closer the sensor 20 is mounted on the injection valve 18, the greater the effect of the pressure wave occurring. As a result, the signal strength of the measurement can be significantly improved, as a result of which disturbances have less influence.
  • magnetoelastic sensors can be used with a length of a few centimeters, about 3.5 centimeters, which are for example concent ⁇ trically attached to the high-pressure line 27.
  • the selectability of the position of the sensor 20 on the high ⁇ pressure line 27 be ⁇ limited to areas of the line, which has a straight course of at least the length of the sensor 20.
  • 27 has the high-pressure line on ⁇ more bends in which the sensor 20 can not be attached.
  • the sensor 20 is preferably mounted as a magnetoelastic sensor on a sufficiently long straight line piece which is closest to the injection valve 18.
  • 20 voltages are induced by the pressure fluctuations occurring in the high-pressure line 27 in a coil of the pressure sensor.
  • This voltage can be NEN Trans- with ⁇ means of suitable signal processing in the pressure signal.
  • this can be done UNMIT ⁇ telbar in the pressure sensor 20 with a prescribed therein, or electronics in the control unit 28th
  • the induced voltage can be detected by means of an existing in the control unit 28 analog-to-digital converter.
  • the evaluation of the measured values of the pressure sensor takes place in the control unit 28.
  • the pressure accumulator sensor 23 can be used for detecting the pressure in the high-pressure accumulator 17, alternatively or in combination.
  • a pressure signal P O is detected with the aid of the already described pressure sensor 20, whereby the pressure depends on the time.
  • P (0) parameter values are then determined in step 32, from which the desired correction values can be determined.
  • the frequency f D, the amplitude A and the phase ⁇ D D can be determined who ⁇ .
  • the pressure signal P (O is modeled as the sum of two sine waves :
  • I I Where t is the time interval se next to Corridor ⁇ verging injection from the last injection.
  • the frequency f D of the pressure fluctuation can now be determined. This can be done, for example, by carrying out a Fourier transformation. If the frequency f D to be determined quickly, the frequency f D also with
  • the amplitude A and the phase D can ⁇ D respectively with the aid of a suitable Ver ⁇ proceedings, such as the method known from the literature least square estimator, can be determined.
  • the parameters are thus:
  • the desired parameters can be determined
  • the correction value is then determined.
  • Kor ⁇ rekturwert is a time value which is added to the nominal value of the Einspritzventilbestromungsdauer. Depending on whether the nominal value is too large or too small, the correction value is negative or positive.
  • the correction value can be calculated ⁇ who. This is because the injector characteristic map shows the energizing duration of the injection valve as a function of the pressure. The injection valve map is determined for a hydraulic rest ⁇ position and is accordingly only valid if no pressure waves applied to the injector. An applied pressure wave falsifies the injected fuel quantity, so that the value calculated from the injection valve characteristic field has to be corrected.
  • step 34 first the deviation of the injection quantity from the setpoint value has to be calculated.
  • the encouragenabwei ⁇ monitoring system is dependent on the operating point and, as the pressure signal P (t), modeled as follows:
  • step 36 the correction for the next injection is made.
  • the pressure sensor 20 is also the possibility, in addition to the parameters amplitude A D and phase ⁇ D and the frequency F D of the pressure signal P (O accurately determ ⁇ men. For example, this can be complicated by a computationally al ⁇ lerdings Fourier transform carried out. If the frequency F D is to be determined rapidly, the frequency can also be determined by means of correlation calculations for which the measured pressure signal P (O with synthe ⁇ tables signal prototypes of different frequencies are compared. the maximum correlation value is obtained with the greatest agreement between the frequencies of measured and synthetic signal.
  • the temperature of the fuel and / or the type of fuel can in principle be determined.
  • the pressure factor 20 determines the instantaneous pressure and the frequency f D from the pressure signal P (O.
  • the frequency variation over as a function of the applied pressure can be measured for different temperatures at a test stand be and thus represents an off ⁇ evaluation available.
  • Ti is as ⁇ at greater than T 2.
  • the calculation is carried out shortly after the cold start of the system. For then the fuel temperature corresponds to the measurable outside temperature. With help the frequencies can be decided which type of fuel is present when the map for a sufficient number of temperatures is stored.

Landscapes

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

Abstract

Dans un moteur à combustion interne, il est prévu un capteur de pression (20) dans la conduite à haute pression (27). Du carburant sous pression est amené par la conduite à haute pression (27) jusqu'à une soupape d'injection (18). Le capteur de pression (20) sert à mesurer la pression dans la conduite à haute pression (27) en fonction du temps. A partir de la pression relevée, une valeur de correction est déterminée pour l'injection suivante.
PCT/EP2007/058992 2006-09-07 2007-08-29 Procédé et dispositif de correction de la durée d'injection dans un moteur a combustion interne WO2008028849A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610042098 DE102006042098B3 (de) 2006-09-07 2006-09-07 Verfahren zur Ermittlung einer Korrektur einer Teileinspritzmenge einer Brennkraftmaschine
DE102006042098.5 2006-09-07

Publications (1)

Publication Number Publication Date
WO2008028849A1 true WO2008028849A1 (fr) 2008-03-13

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DE (1) DE102006042098B3 (fr)
WO (1) WO2008028849A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2138694A1 (fr) * 2008-06-25 2009-12-30 Honda Motor Co., Ltd. Dispositif d'injection de carburant
CN107013352A (zh) * 2016-01-27 2017-08-04 丰田自动车株式会社 内燃机的控制装置
WO2022043194A1 (fr) * 2020-08-31 2022-03-03 Vitesco Technologies GmbH Procédé et dispositif de détermination de la quantité d'injection de fluide d'un système d'injection

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4968319B2 (ja) * 2009-12-24 2012-07-04 トヨタ自動車株式会社 燃料噴射弁の異常判定装置
JP5635022B2 (ja) 2012-02-10 2014-12-03 株式会社日本自動車部品総合研究所 燃圧波形取得装置
JP6281580B2 (ja) * 2016-01-27 2018-02-21 トヨタ自動車株式会社 内燃機関の制御装置

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GB127379A (en) * 1918-05-17 1919-05-19 Edward Brice Killen Improvements in or relating to Wheels and Wheel Fitments.
US3651343A (en) * 1967-09-26 1972-03-21 Sopromi Soc Proc Modern Inject Method of regulation of the duration of repeated rectangular electric signal and devices for the practical application of the same method
US20060207568A1 (en) * 2005-03-18 2006-09-21 Kazuma Miyazaki Internal combustion engine provided with double system of fuel injection
DE102006000357A1 (de) * 2005-07-21 2007-02-01 Denso Corp., Kariya Kraftstoffeinspritzsteuereinrichtung

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DE3118425A1 (de) * 1981-05-09 1982-12-09 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zum erfassen der den brennraeumen eines dieselmotors zugefuehrten kraftstoffmenge
DE19633156A1 (de) * 1996-08-17 1998-02-19 Bosch Gmbh Robert Vorrichtung und Verfahren zur Steuerung einer Brennkraftmaschine
DE19720378C2 (de) * 1997-05-15 2002-03-14 Daimler Chrysler Ag Verfahren zur Bestimmung der Öffnungszeit eines Einspritzventiles einer Hochdruckspeicher-Einspritzanlage
DE19757293C2 (de) * 1997-12-22 1999-11-25 Siemens Ag Vorrichtung zum Bestimmen des Einspritzbeginns bei einer direkteinspritzenden Brennkraftmaschine
EP1064457B1 (fr) * 1998-03-16 2002-06-12 Siemens Aktiengesellschaft Procede pour determiner le temps d'injection dans un moteur a combustion interne a injection directe
DE19937148B4 (de) * 1999-08-06 2012-12-27 Robert Bosch Gmbh Verfahren zur Bestimmung der Kraftstoff-Einspritzmengen
DE10232356A1 (de) * 2002-07-17 2004-01-29 Robert Bosch Gmbh Verfahren zur Steuerung von Injektoren eines Kraftstoffzumesssystems einer Brennkraftmaschine
DE10316811A1 (de) * 2003-04-11 2004-11-04 Siemens Ag Verfahren zur Bestimmung der Einspritzzeitdauer bei einer Brennkraftmaschine mit einem Kennfeldwert und einem Korrekturwert und Verfahren zur Ermittlung des Korrekturwerts
DE10330705B4 (de) * 2003-07-08 2014-09-04 Robert Bosch Gmbh Verfahren und Vorrichtung zur Steuerung einer Brennkraftmaschine
DE102004047959A1 (de) * 2004-10-01 2006-04-06 Siemens Ag Verfahren und Vorrichtung zur Bestimmung des Drucks in Rohren

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB127379A (en) * 1918-05-17 1919-05-19 Edward Brice Killen Improvements in or relating to Wheels and Wheel Fitments.
US3651343A (en) * 1967-09-26 1972-03-21 Sopromi Soc Proc Modern Inject Method of regulation of the duration of repeated rectangular electric signal and devices for the practical application of the same method
US20060207568A1 (en) * 2005-03-18 2006-09-21 Kazuma Miyazaki Internal combustion engine provided with double system of fuel injection
DE102006000357A1 (de) * 2005-07-21 2007-02-01 Denso Corp., Kariya Kraftstoffeinspritzsteuereinrichtung

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2138694A1 (fr) * 2008-06-25 2009-12-30 Honda Motor Co., Ltd. Dispositif d'injection de carburant
CN107013352A (zh) * 2016-01-27 2017-08-04 丰田自动车株式会社 内燃机的控制装置
CN107013352B (zh) * 2016-01-27 2020-01-03 丰田自动车株式会社 内燃机的控制装置
WO2022043194A1 (fr) * 2020-08-31 2022-03-03 Vitesco Technologies GmbH Procédé et dispositif de détermination de la quantité d'injection de fluide d'un système d'injection

Also Published As

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