EP1242738B1 - Regulation de concentricite pour moteurs diesel - Google Patents

Regulation de concentricite pour moteurs diesel Download PDF

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Publication number
EP1242738B1
EP1242738B1 EP01993755A EP01993755A EP1242738B1 EP 1242738 B1 EP1242738 B1 EP 1242738B1 EP 01993755 A EP01993755 A EP 01993755A EP 01993755 A EP01993755 A EP 01993755A EP 1242738 B1 EP1242738 B1 EP 1242738B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
speed
cylinders
engine
injection quantities
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.)
Expired - Lifetime
Application number
EP01993755A
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German (de)
English (en)
Other versions
EP1242738A1 (fr
Inventor
Jörg REMELE
Andreas Schneider
Albrecht Debelak
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.)
Rolls Royce Solutions GmbH
Original Assignee
MTU Friedrichshafen 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 MTU Friedrichshafen GmbH filed Critical MTU Friedrichshafen GmbH
Publication of EP1242738A1 publication Critical patent/EP1242738A1/fr
Application granted granted Critical
Publication of EP1242738B1 publication Critical patent/EP1242738B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02D41/008—Controlling each cylinder individually
    • F02D41/0085—Balancing of cylinder outputs, e.g. speed, torque or air-fuel ratio
    • 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
    • F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of the engine
    • F02D41/1498—With detection of the mechanical response of the engine measuring engine roughness
    • 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
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1015—Engines misfires
    • 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
    • F02D41/008—Controlling each cylinder individually
    • F02D41/0087—Selective cylinder activation, i.e. partial cylinder operation

Definitions

  • the invention relates to a method for concentricity control, such as that from DE 195 48 604 C1 emerges as known.
  • the known method serves Differences in the torque contributions of individual cylinders of an internal combustion engine based on to determine the crankshaft speed curve. It builds on the knowledge that the rotary motion of the crankshaft under the action of gas and mass forces runs irregularly.
  • To the speed or torque component of a cylinder determine individual cylinders are specifically switched off during engine operation.
  • the torque percentage of each individual cylinder can be Display the total engine torque in isolation based on the speed signal.
  • the of Production tolerances resulting from injection quantity variations are recognized and should be can be compensated by using the same mean pressures in all cylinders Injection quantity variation can be produced.
  • the fuel supply can be one Cylinder are switched off, which then works as a compressor, for example.
  • the fuel supply is provided to change the remaining, normally working cylinders in a suitable manner. It should be possible to determine through experimentation and calculation in which way the Torque of the cylinder is to be distributed in order to optimally suppress the To achieve vibrations. For certain operating cases, this way determined data available, according to which the internal combustion engine is controlled.
  • the Injection quantities are obviously distributed among the individual cylinders so that the Vibrations of the 0.5th to 3rd orders are suppressed, since only they in the Practice are responsible for noticeable vibrations. However, the Obviously, vibrations of the different orders are not always equally suppress.
  • the appropriate fuel distribution is apparently related to the Size of the vector responsible for the vibrations.
  • WO 98/07971 also describes a method for cylinder-selective control of a self-igniting internal combustion engine as known.
  • multi-cylinder Motors add up the deviations of the individual cylinders so unfavorably that the Impact is the same as if a cylinder has completely failed.
  • interruptions in operation occur due to faults in the injection system. Damaged one or Exhaust valves can result in loss of compression. Switching off too of cylinders represents an operating case, the torsional vibration stress changed.
  • the effect of operating conditions that deviate from normal operation the excitation behavior of the motor is shown by a vector representation of the excitation forces clarified. It is further stated that only the excitatory ones in dropout operation Forces of the 0.5th, 1st and 1.5th order are of interest.
  • the exciting one Alternating torque is calculated from the vector sum according to the phase position the harmonic.
  • engine interventions e.g. are practically not feasible by changing the ignition pressure.
  • the invention has for its object a concentricity control especially for to represent high-cylinder internal combustion engines.
  • the cylinders are switched off one after the other and the speed above Crank angle recorded.
  • the speed curve of the healthy is intact Motors, that is, when all cylinders work normally. It can be a brand new engine in normal operation, due to tolerances has slight differences in the speed components of each cylinder, or by one ideal engine whose cylinder, for example, by using the invention Procedure are equal in terms of their shares in the speed acceleration.
  • ideal means that before the reference values are recorded, for example by varying the injection quantities of individual cylinders, a setting is made in which the fluctuations in the speed contributions of the cylinders are minimized. This setting is retained in normal operation.
  • new curves are then generated which reflect the influence of each cylinder on the overall speed curve.
  • These response curves are subjected to a Fourier decomposition. However, only low-frequency harmonic vibrations, expediently the 0.5th to 3rd order, and the associated spectral impulse responses are considered I of the speed curve of a working cycle of each cylinder.
  • the speed curve of the crankshaft is now continuously recorded over the angle and the spectrum of the speed curve is analyzed in an analogous manner by Fourier decomposition of the curve curve obtained R of a working game.
  • the Fourier coefficients of the low-frequency vibrations are used, namely preferably the harmonics of the 0.5th to 3rd order, which are processed to form a line matrix.
  • the spectral impulse responses I and the resultant from Fourier coefficients of the speed curve R can be represented for each harmonic as a vector pointer over the crank angle. If the resultant is zero, no correction of the injection quantities is necessary.
  • the matrix multiplication of impulse responses I with the vector of the spectral speed curve R results in values different from zero and leads to a correction of the injection quantities if there is a runout deviation in normal operation.
  • the correction values which are standardized, are fed to a controller and the injection quantities ⁇ Q are determined, which can be positive or negative and accordingly correct the injection quantities determined by the engine controller for each injector of a cylinder.
  • a speed control loop is shown, as it is known for example from DE 195 15 481 A1.
  • Reference numeral 1 denotes a diesel engine
  • the crankshaft not shown, is connected to a measuring wheel 2.
  • the speed curve of the crankshaft can be recorded over the angle.
  • a filter 4 and a filter 5 faults are masked out and the curve shape is averaged by comparing the recorded curve shapes over several work cycles.
  • the speed curve of the crankshaft is continuously recorded over the angle in normal engine operation.
  • the speed signal of a work cycle is shown by way of example in FIG. 2.
  • the radius marked with r corresponds to the current speed at the angle ⁇ .
  • the speed curve shows a deformation that occurs when a cylinder fails.
  • the spectral speed curve is obtained with the resulting vectors R 1 to R n , where the indices correspond to the considered harmonics.
  • the corresponding operation is carried out in the symbolically represented function block 7.
  • the vectors obtained by Fourier decomposition R are the Fourier coefficients.
  • Preferably only the harmonic vibrations of the 0.5th to 3rd order are considered. With ideal concentricity, no resulting parts of the corresponding harmonics occur or are at least negligible. In reality, however, there is a small resulting vector R , because the harmonic components are not evenly distributed over the circumference.
  • the injection quantity must be corrected individually for each cylinder if, as shown in FIG. 4b, a resultant due to the low-frequency vibration components R is not zero. In the corresponding case, it is assumed that a cylinder has failed and a harmonic of the 0.5th order occurs, which has the phase position shown with respect to the cylinders.

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  • 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)

Claims (9)

  1. Procédé pour la régulation du fonctionnement régulier du vilebrequin d'un moteur à combustion interne où les contributions de chaque cylindre du moteur à combustion interne à l'accélération angulaire sont déterminées au moyen de l'évolution du régime du vilebrequin et où les quantités injectées des injecteurs associés aux cylindres varient afin de régler les contributions de régime à l'évolution du régime, caractérisé en ce que, sur la base des courbes d'évolution du régime du vilebrequin calculées ou mesurées pour chacun des cylindres, un spectre de réponses impulsionnelles I d'un cycle de fonctionnement est constitué pour l'harmonique d'ordre 0,5, en ce qu'en fonctionnement normal, l'évolution du régime du vilebrequin est à chaque fois enregistrée en fonction de l'angle d'un cycle de fonctionnement et, par transformation de Fourier, les coefficients de Fourier sont déterminés en tant que résultante R des harmoniques d'ordre 0,5 au moins et en ce qu'en outre, les facteurs de correction des quantités injectées des différents cylindres sont obtenus par le fait que les composantes de résultante R se trouvant dans le sens des vecteurs de réponses impulsionnelles sont multipliées par les réponses impulsionnelles I et sont regroupées par addition.
  2. Procédé pour la régulation de fonctionnement régulier selon la revendication 1, caractérisé en ce que le spectre de réponses impulsionnelles I est obtenu à partir de la différence entre la courbe de régime du moteur en bon état et la courbe de régime du moteur avec à chaque fois un cylindre coupé, pour chaque cylindre, par une transformation de Fourier de la courbe différentielle des régimes pour chaque cylindre.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le produit scalaire est effectué à partir des réponses impulsionnelles I et des coefficients de Fourier R , produit scalaire dont les membres, après multiplication par le vecteur unitaire, représentent les facteurs de correction des quantités injectées pour chaque cylindre en module et en direction.
  4. Procédé selon la revendication 1, 2 ou 3, caractérisé en ce que les fractions de basses fréquences de plusieurs ondes harmoniques sont déterminées à partir des allures de courbe par transformation de Fourier et les facteurs de correction des quantités injectées sont ainsi représentés pour chacun des cylindres.
  5. Procédé selon la revendication 4, caractérisé en ce que les ondes harmoniques d'ordres 0,5 à 3 sont prises en considération.
  6. Procédé selon la revendication 4, caractérisé en ce que les coefficients de Fourier d'ordres 0,5 à 1 sont utilisés.
  7. Procédé selon la revendication 5, caractérisé en ce qu'en outre, les ondes harmoniques d'ordre 1,5 sont prises en compte.
  8. Procédé selon l'une quelconque des revendications 1 à 7, caractérisé en ce que les coefficients des transformées de Fourier sont mémorisés et traités sous la forme de matrices dans l'ordinateur de bord.
  9. Procédé selon l'une quelconque des revendications 1 à 8, caractérisé en ce que le réglage des quantités injectées des différents cylindres du moteur en bon état est corrigé jusqu'à ce que les contributions des cylindres à l'accélération angulaire, tout au moins en ce qui concerne les harmoniques de basses fréquences, soient ajustées de manière largement uniforme et en ce que les contributions des différents cylindres à l'évolution du régime sont déterminées par rapport à cette évolution du régime.
EP01993755A 2000-11-07 2001-11-02 Regulation de concentricite pour moteurs diesel Expired - Lifetime EP1242738B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10055192 2000-11-07
DE10055192A DE10055192C2 (de) 2000-11-07 2000-11-07 Rundlaufregelung für Dieselmotoren
PCT/EP2001/012697 WO2002038936A1 (fr) 2000-11-07 2001-11-02 Regulation de concentricite pour moteurs diesel

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Publication Number Publication Date
EP1242738A1 EP1242738A1 (fr) 2002-09-25
EP1242738B1 true EP1242738B1 (fr) 2003-07-23

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US (1) US6820593B2 (fr)
EP (1) EP1242738B1 (fr)
DE (2) DE10055192C2 (fr)
WO (1) WO2002038936A1 (fr)

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Also Published As

Publication number Publication date
EP1242738A1 (fr) 2002-09-25
US6820593B2 (en) 2004-11-23
WO2002038936A1 (fr) 2002-05-16
US20030089338A1 (en) 2003-05-15
DE50100412D1 (de) 2003-08-28
DE10055192A1 (de) 2002-05-29
DE10055192C2 (de) 2002-11-21

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