EP0695865B1 - Verfahren zur Korrektur der Unsymmetrien eines Geberrades - Google Patents

Verfahren zur Korrektur der Unsymmetrien eines Geberrades Download PDF

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Publication number
EP0695865B1
EP0695865B1 EP19950401816 EP95401816A EP0695865B1 EP 0695865 B1 EP0695865 B1 EP 0695865B1 EP 19950401816 EP19950401816 EP 19950401816 EP 95401816 A EP95401816 A EP 95401816A EP 0695865 B1 EP0695865 B1 EP 0695865B1
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EP
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Prior art keywords
engine
ignition
values
value
cut
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Expired - Lifetime
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EP19950401816
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English (en)
French (fr)
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EP0695865A1 (de
Inventor
Christophe Genin
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Marelli France SAS
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Magneti Marelli France SAS
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    • 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

Definitions

  • the invention relates to a correction method, less partial, of any size, the values of which are linked, directly or indirectly, to the rotation of a internal combustion engine, in particular an engine injection, depending on asymmetries and / or fluctuations of rotation of a target, linked in rotation to this motor, and to using which the values of the quantity considered are defined by measurement and / or calculation.
  • the invention therefore relates to a method for to compensate, at least in part, for the effects of asymmetries and / or fluctuations in the rotation of a linked target in rotation to an internal combustion engine on the values of a magnitude, related to the rotation of the target, except only the scrolling time of at least one sector defined angularity of this target, these asymmetries and / or fluctuations in target rotation resulting from asymmetries and / or manufacturing irregularities and / or centering of all components of the assembly or rotary assembly comprising the target linked in rotation to the combustion engine internal.
  • the quantity corrected by the method according to the invention is therefore any quantity that can be represented by at minus a signal based on information from at least one position and / or rotation detector of a rotary target, linked in rotation to the crankshaft, to a flywheel engine or a combustion engine output shaft internal, with the exception of the scrolling time of at least one defined angular sector of the target opposite a sensor.
  • an internal combustion engine in particular an engine injection, the values of which are obtained by measurement and / or calculation from an angular position signal of the shaft the engine provided by a sensor of a well known type, comprising a target presenting singularities (teeth or holes) integral in rotation with the crankshaft or the flywheel motor, are used as quantities taken into consideration to determine operating states of the engine.
  • gas torque i.e. the torque produced by the combustion of the mixture fuel in a combustion chamber, during the phase combustion-expansion of the corresponding cylinder of the engine, during an engine cycle
  • spark ignition also called spark ignition engine sparks
  • document EP 583 496 describes a method for detecting misfire of a injection, in which we measure, during the injection phase of fuel, then in the injection cut-off phase, the times scrolling of angular sectors defined on the target linked in rotation to the crankshaft as corresponding to combustion-expansion phases of the different cylinders of the motor, and then compare the times measured with each other and to thresholds, in order to detect the occurrence of misfires of combustion.
  • GB-A-2 249 839 also discloses a process detection of engine misfire, according to which we consider to be a misfire if the difference between torques measured during the combustion phase and in the non-combustion phase exceeds a certain threshold, and this for each cylinder, regardless of the conditions of combustion or non-combustion in other cylinders.
  • various corrections are performed, which is not to correct measured couples, but to take into account a difference between an average of two torque measurements and a third torque measurement performed outside combustion, cylinder by cylinder, to modify at least one detection threshold for misfires.
  • the object of the invention is on the contrary to correct values of any magnitude, except the time of scrolling of at least one angular sector, and such by example that the engine torque, which is related to the rotation of the engine, depending on asymmetries and / or fluctuations of rotation of the target linked in rotation to the motor.
  • the method according to the invention for the correction of a quantity, linked to the rotation of a motor internal combustion, in particular of an injection engine, depending on asymmetries and / or fluctuations in rotation of a target linked in rotation to the engine and using which are defined, by calculation and / or measurement, values size, with the exception of the scrolling time of minus an angular sector defined on the target, and which includes the steps of setting a value for the magnitude for each of the angular sectors of the target corresponding respectively to a combustion-expansion phase of each engine cylinder, and on at least one engine cycle, in ignition and / or power cut-off phase engine fuel, at least one engine speed given above a speed close to idling, is characterized in that it further comprises the steps of calculate the average of the values obtained for all angular sectors, to define for each sector a term compensation equal to the product of the difference between the average of the values and the value of the quantity for this sector by a proportionality coefficient, preferably less than or equal to 1, and to add,
  • the process comprises the steps consisting in defining a value of the quantity for each at least two successive engine U-turns, in the ignition and / or fuel supply cut-off audit given engine speed, to calculate half the variation of value of the quantity resulting from a motor half-turn to the other, to define the term compensation as equal to the product of half the change in value by the proportionality coefficient, and to add the term of compensation for the values of the quantity obtained in phase ignition and fuel supply for U-turns motor providing the value of the most variable low during ignition and / or power cut-off or respectively to subtract the term of compensation of values of the quantity obtained during the ignition phase and fuel supply for engine U-turns providing the value of the largest quantity in the phase of ignition and / or fuel supply cut out said engine speed range.
  • the method of the invention thus proposes a step to compensate for the differences in the quantities which are attributable to manufacturing tolerances and centering the target of the position detector of the crankshaft, as well as components of the rotating assembly of the engine as mentioned above.
  • the coefficient of proportionality chosen to calculate the compensation term depends on the load and / or the engine speed, and can be drawn from a table with one or two entries, in function of this or these operating parameters of the engine.
  • the method further consists, for each angular sector of the target or each of the engine U-turns, to define the term compensation and / or the corresponding value of the magnitude, or the difference between the mean of the values for the different sectors and the value for the sector considered, or the variation of values of the quantity between two consecutive U-turns, in several areas of successive regimes, preferably with a step noticeably constant, between the neighboring idle speed and a speed maximum engine operation.
  • the process consists of addition, for each angular sector of the target or each engine U-turn, to define the corresponding value of the magnitude, or the difference between the mean of the values and the value of the angular sector considered, or the variation in value of the quantity between two U-turns consecutive engine, as itself being an average values, differences or variations respectively of values of the quantity over a given number of cycles consecutive engines.
  • the method can also consist in memorizing the difference between the average of the values and the value of the quantity for the sector considered or to memorize the variation of the value the size between two consecutive engine U-turns, in a table at an entry according to the regime, for each angular sector.
  • 1 shows a angular position sensor of the engine crankshaft, of a well-known type, already fitted to most vehicles automobiles, associated with an electronic control circuit motor and comprising a tachometric target, produced under the shape of a wheel 2 with singularities, toothed in this example, integral in rotation with the flywheel or engine crankshaft, as well as a sensor 3 fixed on the motor, the detector 1 being of the variable reluctance type, in which the sensor 3 is sensitive to the passage opposite teeth of wheel 2 and delivers an electrical signal pulsating variable frequency proportional to the regime N of the motor, this signal being shaped in a circuit 4 delivering the engine position signal to the rest of the device.
  • the position signal is delivered to the engine control unit 5, controlling the injection and engine ignition.
  • the position signal is sent to a stage 6 for calculating the gas torque Cg produced by each combustion-expansion phase in each cylinder of the engine, for all its cycles.
  • the engine being of the kind comprising marks of measures, such as the teeth of wheel 2, arranged on a wheel or crown integral with the flywheel or crankshaft, means, such as width teeth wheel 2, to define a reference for indexing the markers, and a sensor 3 for scrolling the marks, fixedly mounted in the vicinity of the wheel or crown 2,
  • the signal processing circuit contained in stage 6 implements a production process of representative value of the gas torque Cg generated by each combustion of the gas mixture in combustion engine cylinders internal, this process being such as that, for example, described in patent FR 2 681 425, incorporated herein description by reference, and to which reference will be made for more details.
  • the device implementing the method of the invention also includes means for calculating and memory allowing him to ensure compensation by learning of the symmetry defects of the tachometric target 2 of the engine position sensor 1.
  • the gas torque Cg is calculated at each combustion-expansion phase on a corresponding engine U-turn, in this example of a four-cylinder, four-stroke engine, i.e. to half or to the other half of the periphery of the wheel 2 from a singularity identifying the passage to top dead center of a reference cylinder.
  • Stage 6 which receives the cut-off information ignition or injection of unit 5, calculates, in phase of ignition or injection cut-off, the gas torque Cg and transmits these values to stage 7 of identification of asymmetries of the target 2 as a function of the engine speed N, whose signal is received by stage 7 of the control unit motor 5.
  • stage 7 calculates the average value of the gas torque Cg in ignition or injection cut-off phase for each of the target U-turns 2, for example 50 engine U-turns in a diet area and then the variation of the average gas torque from one half-target 2 to the other, corresponding to the difference between the two values averages of Cg and then calculating half of that difference, and its memorization in a table 8 to a input, depending on engine speed N, over the entire range engine speed, between a speed close to idle (for example of 1200 rpm) and the maximum speed, with zones speed following steps of 200 rpm or 500 rpm per example.
  • Compensating for symmetry defects of the target 2 can be ensured, in the injection and ignition phase and for a given speed N, by adding, in the adder stage 10, receiving the Cg values during the injection phase and of ignition of stage 6, the half-deviation of gas torque memorized in stage 8 for the regime zone containing N to the Cg measurements obtained in stage 6 with half of target 2 giving the value (average) of the highest gas torque low in injection or ignition cut-off, and by subtracting the half-torque deviation memorized at Cg measurements obtained with half of target 2 giving the value (average) of the greatest gas torque in injection cut-off or ignition.
  • the half-deviation of gas torque memorized in stage 8 is weighted, in multiplier stage 9 receiving the engine speed signal N from unit 5 and also an engine load signal (not represented), by a coefficient K which is a function of the load and / or engine speed N, and taken from a table corresponding to one or two entry (s) stored in this stage 9.
  • the compensation therefore consists in applying in phase injection and ignition in stage 10 a correction proportional to the half-disconnection of the gas cut-off injection or ignition, and defined by a term of compensation equal to the product of this half-deviation memorized by a proportionality coefficient K, taken from stage 9, and which can be equal to 1 or depends on the load and / or the engine speed N.
  • This compensation by addition or subtraction a correction proportional to the half-deviation of gas torque between the two halves of the rotating target 2 in phase of injection or ignition shutdown is simple application to four-cylinder and four-stroke engines of the most general compensation.
  • the latter consists for a z-cylinder engine, to be calculated during the shutdown phase ignition and / or injection, the value (average over by example 100 consecutive engine cycles) of Cg on each angular combustion-expansion sector of a cylinder, value 2 engine revs / z, , if the engine is at four-stroke, or 1 engine revolution / z if the engine is two time, calculating the average of the values (means) of Cg on all sectors, then calculate, for each sector, the difference between this mean and the (mean) value of Cg for this sector, possibly to weight this difference by a coefficient K depending on the load and / or the engine speed, and then to compensate, at least partially, the calculated value of Cg during the injection phase and for each sector by adding this possibly weighted difference.
  • the most compensation general therefore consists in applying, for each sector, to Cg values obtained during injection and ignition phase for this sector, a compensation or correction term additive proportional to the difference between the mean of couples Cg, calculated for all sectors in phase of injection and / or ignition cut-off, and the torque Cg calculated for the sector considered also in cutoff injection and / or ignition.
  • Stage 10 thus delivers on its output, for each combustion-expansion phase in each engine cylinder, a signal representative of the value of the gas torque Cg produced in the corresponding cylinder by combustion corresponding, and corrected for the asymmetry of target 2.

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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. Verfahren zur wenigstens teilweisen Korrektur einer mit der Drehung eines Verbrennungsmotors, insbesondere eines Einspritzmotors, verbundenen Größe (Cg) in Abhängigkeit von Unsymmetrien und/oder Schwankungen der Drehung einer Durchlaßscheibe (2), die mit dem Motor drehbar verbunden ist und mit deren Hilfe die Werte der Größe (Cg) durch Messung und/oder Berechnung festgelegt werden, ausgenommen in der Zeit des sich Vorbeibewegens von wenigstens einem auf der Durchlaßscheibe begrenzten Winkelabschnitt, mit den Schritten bestehend aus dem Festlegen eines Wertes der Größe (Cg) für jeden der Winkelabschnitte der Durchlaßscheibe (2), die jeweils einer Phase einer Expansionsverbrennung jedes Zylinders des Motors entsprechen, und wenigstens über einen Motorzyklus hinweg, in der Phase der Unterbrechung der Zündung und/oder der Versorgung des Motors mit Kraftstoff, mit wenigstens einer Motordrehzahl, die höher liegt als eine Drehzahl in der Nähe des Leerlaufs, dadurch gekennzeichnet, daß es ferner die darin bestehenden Schritte umfaßt, den Mittelwert der erhaltenen Werte für alle Winkelabschnitte zu berechnen, für jeden Abschnitt ein Ausgleichsglied festzulegen, das gleich dem Produkt ist aus der Differenz zwischen dem Mittelwert der Werte und dem Wert der Größe für diesen Abschnitt und einem Proportionalitätskoeffizienten (K), vorzugsweise kleiner oder gleich 1, und für jeden Abschnitt das entsprechende Ausgleichsglied zu Werten der GröBe hinzuzufügen, die in einer Phase der Zündung und der Versorgung mit Kraftstoff für diesen Abschnitt über wenigstens einen Drehzahlbereich des Motors, einschließlich der Drehzahlen, für welche die Unterbrechung der Zündung und/oder der Versorgung mit Krafstoff ausgeführt wurde, festgelegt wurden.
  2. Verfahren nach Anspruch 1 für einen Motor mit vier Zylindern und vier Takten, dadurch gekennzeichnet, daß es die darin bestehenden Schritte umfaßt, einen Wert der Größe (Cg) für jede von wenigstens zwei aufeinanderfolgenden Motor-Halbumdrehungen in einer Phase der Unterbrechung der Zündung und/oder der Versorgung mit Kraftstoff der gegebenen Motordrehzahl festzulegen, die Hälfte der Wertevariation der Größe zu berechnen, die sich aus einer Motor-Halbdrehung nach der anderen ergibt, das Ausgleichsglied so festzulegen, daß es gleich dem Produkt aus der Hälfte der Wertevariation und dem Propotionalitätskoeffizienten (K) ist, und das Ausgleichsglied den in einer Phase der Zündung und Versorgung mit Kraftstoff für die Motor-Halbumdrehungen erhaltenen Werten der Größe (Cg) hinzuzufügen, was den geringeren Wert der Größe in einer Phase der Unterbrechung der Zündung und/oder der Versorgung mit Kraftstoff bewirkt, bzw. das Ausgleichsglied von den in einer Phase der Zündung und Versorgung mit Kraftstoff für die Motor-Halbdrehungen erhaltenen Werte der Größe (Cg) abzuziehen, was den größeren Wert der Größe (Cg) in einer Phase der Unterbrechung der Zündung und/oder der Versorgung mit Kraftstoff über den Motordrehzahlbereich bewirkt.
  3. Verfahren nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß es ferner daraus besteht, einen Proportionalitätskoeffizienten (K) zu wählen, der von der Last des Motors abhängig ist.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß es ferner daraus besteht, einen Proportionalitätskoeffizienten (K) zu wählen, der abhängig ist von der Drehzahl (N) des Motors.
  5. Verfahren nach einem der Ansprüche 1 bis 4 für einen Einspritzmotor, dadurch gekennzeichnet, daß die Phasen des Motors der Versorgung und der Unterbrechung der Versorgung mit Kraftstoff jeweils den Phasen der Einspritzung und der Unterbrechung der Einspritzung des Kraftstoffes entsprechen.
  6. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Phasen der Versorgung und der Unterbrechung der Versorgung jeweils mit den Phasen der Zündung und der Unterbrechung der Zündung übereinstimmen.
  7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß es auch den darin bestehenden Schritt umfaßt, für jeden Winkelabschnitt der Durchlaßscheibe (2), oder Motor-Halbumdrehung, das Ausgleichsglied und/oder den Wert oder die Differenz oder die Variation der Werte der Größe (Cg) über mehrere aufeinanderfolgende Bereiche der Drehzahl (N), vorzugsweise in im wesentlichen konstanter Schrittfolge, zwischen der Drehzahl in der Nähe des Leerlaufs und einer funktionsabhängigen maximalen Drehzahl des Motors festzulegen.
  8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß es umfaßt den darin bestehenden Schritt, für jeden Winkelabschnitt der Durchlaßscheibe (2) oder jede Motor-Halbumdrehung den Wert oder die Differenz oder die Variation der Werte der Größe (Cg) so festzulegen, daß sie ein Mittelwert der Werte oder der Differenzen oder der Variationen der Werte der Größe (Cg) über eine gegebene Anzahl von aufeinanderfolgender Motorzyklen ist.
  9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß es ferner umfaßt den darin bestehenden Schritt, die Differenz oder Variation der Werte der Größe (Cg) in einer Tabelle mit einer Eingabe in Abhängigkeit von der Drehzahl (N) für jeden Winkelabschnitt zu speichern.
EP19950401816 1994-08-03 1995-08-02 Verfahren zur Korrektur der Unsymmetrien eines Geberrades Expired - Lifetime EP0695865B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9409646 1994-08-03
FR9409646A FR2723400B1 (fr) 1994-08-03 1994-08-03 Procede de correction d'une grandeur liee a la rotation d'un moteur a combustion interne en fonction des dissymetries d'une cible liee en rotation a ce moteur

Publications (2)

Publication Number Publication Date
EP0695865A1 EP0695865A1 (de) 1996-02-07
EP0695865B1 true EP0695865B1 (de) 1998-11-11

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EP19950401816 Expired - Lifetime EP0695865B1 (de) 1994-08-03 1995-08-02 Verfahren zur Korrektur der Unsymmetrien eines Geberrades

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EP (1) EP0695865B1 (de)
DE (1) DE69505910T2 (de)
ES (1) ES2126848T3 (de)
FR (1) FR2723400B1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19628739B4 (de) * 1996-07-17 2011-07-28 Andreas Stihl AG & Co. KG, 71336 Verfahren zur Steuerung des Einspritzvorgangs bei einer schnellaufenden 2-Takt-Brennkraftmaschine mit Kraftstoffeinspritzung
WO1999040308A1 (de) * 1998-02-09 1999-08-12 Siemens Aktiengesellschaft Verfahren zur drehzahlregelung von mehrzylindrigen verbrennungsmotoren
GB2362416A (en) * 2000-05-17 2001-11-21 Stephen Peter Dixon Building aperture flood barrier
EP1757946B1 (de) * 2005-08-23 2016-12-28 Denso Corporation Drehwinkelsensor
FR3035448B1 (fr) * 2015-04-22 2018-11-02 Continental Automotive France Procede de determination de longueurs reelles de petits intervalles d'une cible dentee d'un vilebrequin

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5117681A (en) * 1990-10-01 1992-06-02 Ford Motor Company Correction of systematic position-sensing errors in internal combustion engines
US5307670A (en) * 1990-11-01 1994-05-03 Fuji Jukogyo Kabushiki Kaisha Misfire discriminating method for an engine
FR2681425B1 (fr) 1991-09-12 1993-11-26 Renault Regie Nale Usines Procede et dispositif de mesure du couple d'un moteur thermique a combustion interne.
DE4133679A1 (de) * 1991-10-11 1993-04-22 Bosch Gmbh Robert Verfahren zur adaption von mechanischen toleranzen eines geberrades
EP0583496B1 (de) * 1992-08-14 1995-11-22 Siemens Aktiengesellschaft Verfahren zur Erkennung von Verbrennungsaussetzern
DE59205028D1 (de) * 1992-08-14 1996-02-22 Siemens Ag Verfahren zur Erkennung und Korrektur von Fehlern bei der Zeitmessung an sich drehenden Wellen

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Publication number Publication date
ES2126848T3 (es) 1999-04-01
DE69505910D1 (de) 1998-12-17
DE69505910T2 (de) 1999-07-01
EP0695865A1 (de) 1996-02-07
FR2723400A1 (fr) 1996-02-09
FR2723400B1 (fr) 1996-10-11

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