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DE3802803A1 - Process for determining the fractions of the torque produced by an internal combustion engine specific to individual combustion chambers - Google Patents

Process for determining the fractions of the torque produced by an internal combustion engine specific to individual combustion chambers

Info

Publication number
DE3802803A1
DE3802803A1 DE3802803A DE3802803A DE3802803A1 DE 3802803 A1 DE3802803 A1 DE 3802803A1 DE 3802803 A DE3802803 A DE 3802803A DE 3802803 A DE3802803 A DE 3802803A DE 3802803 A1 DE3802803 A1 DE 3802803A1
Authority
DE
Germany
Prior art keywords
combustion chamber
individual
combustion engine
internal combustion
determining
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.)
Granted
Application number
DE3802803A
Other languages
German (de)
Other versions
DE3802803C2 (en
Inventor
Istvan Dipl Ing Geiger
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.)
Volkswagen AG
Original Assignee
Volkswagen AG
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 Volkswagen AG filed Critical Volkswagen AG
Priority to DE3802803A priority Critical patent/DE3802803C2/en
Publication of DE3802803A1 publication Critical patent/DE3802803A1/en
Application granted granted Critical
Publication of DE3802803C2 publication Critical patent/DE3802803C2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/008Controlling each cylinder individually
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/14Introducing closed-loop corrections
    • F02D41/1497With detection of the mechanical response of the engine
    • F02D41/1498With detection of the mechanical response of the engine measuring engine roughness
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D2200/00Input parameters for engine control
    • F02D2200/02Input parameters for engine control the parameters being related to the engine
    • F02D2200/10Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1015Engines misfires

Landscapes

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

Abstract

So that the known process for determining torque fractions specific to individual combustion chambers by the imbalance detection method can also be used in internal combustion engines, which due to the relatively rich fuel-air mixture feed in normal operation are not suitable for application of the said process, a fuel-air mixture with a high fuel/air ratio is briefly fed to individual cylinders during the measurements.

Description

Die Erfindung betrifft ein Verfahren gemäß dem Oberbegriff des Patentan­ spruchs 1.The invention relates to a method according to the preamble of the patent saying 1.

Bei der üblichen Regelung einer beispielsweise als Antriebsmotor für ein Kraftfahrzeug dienenden, mehrere Brennräume aufweisenden Brennkraftmaschine in Abhängigkeit von äußeren Parametern, wie der verlangten Maschinenleistung, erfolgt eine gleichzeitige Änderung einzelner Maschinenparameter, wie Kraft­ stoff- bzw. Gemischzufuhr, Einspritzzeitpunkt und Zündzeitpunkt, für alle Brennräume der Brennkraftmaschine unabhängig davon, welche Drehmomentanteile auf die einzelnen Brennräume zurückzuführen sind. Bei einer derartigen Regelung ist es also möglich, daß die einzelnen Brennräume in sehr unterschiedlichem Maß zur Drehmomenterzeugung der Brennkraftmaschine beitragen. Dies kann verschiedene Ursachen haben, beispielsweise unterschiedliche Fertigungs­ toleranzen der verschiedenen den Brennraum bildenden Bauteile, der Ventile und der Einspritzventile bei Brennkraftmaschinen mit Kraftstoffeinspritzung. Es ist auch möglich, daß unterschiedliche Alterungsprozesse auftreten, bei­ spielsweise unterschiedliche Verschmutzungsgrade bei Zündkerzen, so daß auch hier zwischen den einzelnen Brennräumen Unterschiede vorliegen, die zu unterschiedlichen Drehmomentanteilen der Brennräume führen.In the usual regulation of, for example, a drive motor for a Internal combustion engine serving multiple motor vehicles depending on external parameters, such as the required machine performance, there is a simultaneous change of individual machine parameters, such as force substance or mixture supply, injection timing and ignition timing, for everyone Combustion chambers of the internal combustion engine regardless of what torque shares can be traced back to the individual combustion chambers. With such a scheme So it is possible that the individual combustion chambers in very different Measure contribute to the torque generation of the internal combustion engine. This can have different causes, for example different manufacturing tolerances of the various components forming the combustion chamber, the valves and the injection valves in internal combustion engines with fuel injection. It is also possible that different aging processes occur at for example, different degrees of contamination in spark plugs, so that here too there are differences between the individual combustion chambers lead to different proportions of torque in the combustion chambers.

Diesem Tatbestand trägt eine verfeinerte Regelung Rechnung, die über die Erfassung der Laufunruhe der Maschine denjenigen Brennraum erfaßt, dessen Anteil an der Drehmomenterzeugung außerhalb eines Toleranzbereichs liegt; während des Betriebs der Brennkraftmaschine wird dann zumindest eine der oben aufgeführten Betriebsgrößen individuell für diesen Brennraum geändert. Die Erfassung der Laufunruhe geschieht dabei durch Ermittlung der kurzzeitigen Beschleunigungen, die beispielsweise die Kurbelwelle der Brennkraftmaschine durch die Verbrennungsvorgänge in den einzelnen Brennräumen erfährt.This fact is taken into account by a more refined regulation that covers the Detection of the uneven running of the machine detects the combustion chamber whose  Portion of the torque generation lies outside a tolerance range; during operation of the internal combustion engine, at least one of the The operating parameters listed above have been changed individually for this combustion chamber. The uneven running is recorded by determining the short-term Accelerations, for example the crankshaft of the internal combustion engine experienced by the combustion processes in the individual combustion chambers.

Verständlicherweise ist es auch möglich, das beschriebene Prinzip nicht zur Regelung der Brennkraftmaschine während ihres Betriebs, also bei der Antriebsmaschine eines Kraftfahrzeugs während des Fahrbetriebs desselben, zu verwenden, sondern in der Werkstatt zur Diagnose der Maschine. Dort ist es beispielsweise möglich, durch Ermittlung desjenigen Brennraums, dessen Drehmomentanteil außerhalb des Toleranzbereichs liegt, gezielt eine Reparatur vorzunehmen, beispielsweise durch Auswechseln der Zündkerze oder eines Ein­ spritzventils.Understandably, it is also possible that the principle described is not to regulate the internal combustion engine during its operation, that is to say during Driving machine of a motor vehicle while driving the same, to use, but in the workshop to diagnose the machine. There is it is possible, for example, by determining the combustion chamber whose Torque component is outside the tolerance range, targeted repair carry out, for example by changing the spark plug or an on spray valve.

Bezüglich weiterer Einzelheiten, insbesondere auch hinsichtlich des Aufbaus von Einrichtungen zur Laufunruheerfassung, sei auf die EP-A 0 113 227, G 01 M 15/00, verwiesen.With regard to further details, in particular also with regard to the structure of devices for uneven running detection, see EP-A 0 113 227, G 01 M 15/00.

Wenn auch die Tendenz im Hinblick auf Kraftstoffersparnis und Verringerung der Umweltbelastung insbesondere bei Antriebsmaschinen von Kraftfahrzeugen in Richtung Verwendung eines mageren Kraftstoff-Luft-Gemischs mit Luftzahlen λ in der Größenordnung von etwa 1,1 bis 1,2 geht, verlangt der augenblickliche Stand der Katalysatortechnik für Otto-Maschinen die Verwendung eines relativ fetten Gemischs mit Luftzahlen von 1,0 und darunter. Wie sich gezeigt hat, versagt die beschriebene vorteilhafte Methode der Laufunruhenerfassung in der bekannten Weise aber bei der Verbrennung derartiger fetter Gemische (geringes Stör- zu Nutzverhältnis der Signale).Even if the tendency with regard to fuel saving and reduction of the environmental impact, in particular in the case of prime movers of motor vehicles, is towards the use of a lean fuel-air mixture with air ratios λ in the order of magnitude of approximately 1.1 to 1.2, the current state of catalytic converter technology requires for Otto engines the use of a relatively rich mixture with air ratios of 1.0 and below. As has been shown, the described advantageous method of uneven running detection in the known manner fails when burning such rich mixtures (low interference to useful ratio of the signals).

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren gemäß dem Oberbegriff des Patentanspruchs, also unter Verwendung der Laufunruhenerfassung, zu schaffen, daß auch bei einer mit einem relativ fetten Gemisch betriebenen Brennkraftmaschine zuverlässig die brennraumindividuellen Drehmomentanteile zu erfassen gestattet, wobei gleichzeitig die Zuordnung zwischen dem jeweils erfaßten Brennraum und seinem Drehmomentanteil gewahrt und zumindest eine nennenswerte Beeinflussung des Betriebs der Maschine vermieden sein soll. The invention has for its object a method according to the preamble of the patent claim, i.e. using the unrest detection create that even when operated with a relatively rich mixture Internal combustion engine reliably the combustion chamber-specific torque components allowed to record, while at the same time the assignment between each recorded combustion chamber and its torque share maintained and at least one significant influence on the operation of the machine should be avoided.  

Die erfindungsgemäße Lösung dieser Aufgabe besteht in den kennzeichnenden Merkmalen des Hauptanspruchs, eine vorteilhafte Ausbildung für den Fall einer brennraumindividuellen Ausregelung unzulässiger Abweichungen der Dreh­ momentanteile einzelner Zylinder beschreibt der Unteranspruch.The achievement of this task consists in the characterizing Features of the main claim, advantageous training for the case a combustion chamber-specific regulation of impermissible deviations in the rotation The subclaim describes the torque proportions of individual cylinders.

Infolge der Tatsache, daß nur demjenigen Brennraum (Zylinder) der Maschine, der gerade meßtechnisch erfaßt wird, das magere Gemisch zugeführt wird, bietet die Erfindung den Vorteil, daß eine Beeinträchtigung des Betriebs der Maschine und insbesondere auch eine Gefährdung des ggf. in ihr Abgas­ system eingeschalteten Katalyators vermieden ist. Gegebenenfalls können die jeweils anderen Brennräume mit entsprechend fetterem Gemisch betrieben werden.Due to the fact that only that combustion chamber (cylinder) of the machine, which is currently being measured, the lean mixture is added, The invention offers the advantage that an impairment of operation of the machine and in particular also a risk of possibly in its exhaust gas system switched on catalyst is avoided. If necessary, you can the other combustion chambers operated with a correspondingly richer mixture will.

Weiterhin kann die Erfindung sowohl, wie im Anspruch 2 beschrieben, im Rahmen einer Maschinenregelung beispielsweise während des Fahrbetriebs eines mit der Maschine ausgerüsteten Kraftfahrzeugs als auch in einer Werkstatt zu Diagnosezwecken Einsatz finden. Als weiterer Vorteil der Erfindung ist schließ­ lich die Tatsache anzusehen, daß zur Durchführung des erfindungsgemäßen Verfahrens auf beispielsweise aus dem eingangs genannten Stand der Technik bekannte Einrichtungen zurückgegriffen werden kann, die nur geringfügig im Sinne der zeitweiligen Änderung der Luftzahl ergänzt zu werden brauchen. Den Kern auch einer Einrichtung zur Durchführung des erfindungsgemäßen Ver­ fahrens bildet demgemäß ein mit Speichern für die Sollwerte der Drehmoment­ anteile bzw. der Beschleunigungswerte als Maß für diese sowie mit einem Speicher zur Einleitung des Maßvorgangs für die einzelnen Brennräume ausge­ rüsteter Rechner. Eine Darstellung einer Einrichtung zur Durchführung des erfindungsgemäßen Verfahrens erübrigt sich daher für den fachmännischen Leser.Furthermore, the invention can both, as described in claim 2, within the scope a machine control, for example, while driving with one the machine equipped motor vehicle as well as in a workshop Find diagnostic purposes. Another advantage of the invention is closing Lich consider the fact that to carry out the invention Method based on, for example, the prior art mentioned at the outset Known facilities can be used only slightly in the sense of the temporary change in the air ratio need to be supplemented. The core of a device for performing the Ver accordingly forms a with memory for the setpoints of the torque proportions or the acceleration values as a measure of these and with a Memory to initiate the measurement process for the individual combustion chambers equipped computer. An illustration of a facility for carrying out the The inventive method is therefore unnecessary for the professional Reader.

Claims (2)

1. Verfahren zur Ermittlung brennraumindividueller Anteile an dem von einer Brennkraftmaschine erzeugten Drehmoment nach der Methode der Laufunruhen­ erfassung, dadurch gekennzeichnet, daß bei einer mit einem relativ fetten Kraftstoff-Luft-Gemisch (Luftzahl λ 1) betriebenen Brennkraftmaschine dem jeweiligen Brennraum kurzzeitig ein mageres Gemisch mit vorgegebener Luftzahl zugeführt und der dann erzeugte brennraumindividuelle Anteil ermittelt sowie mit einem für die vorgegebene Luftzahl geltenden Sollwert verglichen wird.1. Method for determining combustion chamber-specific proportions of the torque generated by an internal combustion engine according to the method of unrest, characterized in that in a combustion engine operated with a relatively rich fuel-air mixture (air ratio λ 1), the respective combustion chamber briefly receives a lean mixture supplied with a predetermined air ratio and the combustion chamber-specific portion then generated is determined and compared with a target value applicable to the predetermined air ratio. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Ermittlung des brennraumindividuellen Anteils und die Zuführung des mageren Gemischs für die einzelnen Brennräume in vorgegebener Folge von einer Sollwert­ speicher enthaltenden Vorrichtung vorgenommen und aus Differenzen zwischen den Soll- und den Istwerten der brennraumindividuellen Anteile Korrektur­ signale für Menge und/oder Zeitpunkt der Kraftstoffzufuhr und/oder Zünd­ zeitpunkt für den jeweiligen Brennraum erzeugt werden.2. The method according to claim 1, characterized in that the determination of the combustion chamber-specific portion and the supply of the lean mixture for the individual combustion chambers in a predetermined sequence from a setpoint memory containing device made and differences between Correction of the target and actual values of the individual combustion chamber components signals for quantity and / or time of fuel supply and / or ignition be generated for the respective combustion chamber.
DE3802803A 1987-02-10 1988-01-30 Process for determining combustion chamber-specific proportions of the torque generated by an internal combustion engine Expired - Fee Related DE3802803C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE3802803A DE3802803C2 (en) 1987-02-10 1988-01-30 Process for determining combustion chamber-specific proportions of the torque generated by an internal combustion engine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3704032 1987-02-10
DE3802803A DE3802803C2 (en) 1987-02-10 1988-01-30 Process for determining combustion chamber-specific proportions of the torque generated by an internal combustion engine

Publications (2)

Publication Number Publication Date
DE3802803A1 true DE3802803A1 (en) 1988-08-18
DE3802803C2 DE3802803C2 (en) 1998-09-17

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DE3802803A Expired - Fee Related DE3802803C2 (en) 1987-02-10 1988-01-30 Process for determining combustion chamber-specific proportions of the torque generated by an internal combustion engine

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4009285A1 (en) * 1989-08-23 1990-12-20 Audi Ag METHOD FOR CYLINDER SELECTIVE MONITORING OF ENERGY REVENUE IN A MULTI-CYLINDER INTERNAL COMBUSTION ENGINE
US5544636A (en) * 1993-12-16 1996-08-13 Volkswagen Ag Method for obtaining trigger signals to regulate energy conversion in the combustion chamber of an internal combustion engine
DE4122139C2 (en) * 1991-07-04 2000-07-06 Bosch Gmbh Robert Method for cylinder equalization with regard to the fuel injection quantities in an internal combustion engine
US7027910B1 (en) * 2005-01-13 2006-04-11 General Motors Corporation Individual cylinder controller for four-cylinder engine
DE102005001887B3 (en) * 2005-01-14 2006-07-06 Siemens Ag Method for increasing the control range for the equalization of injection quantity differences
DE102007030562B4 (en) 2007-06-30 2018-03-15 Volkswagen Ag Method for operating an internal combustion engine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3210810A1 (en) * 1982-03-24 1983-10-06 Mataro Co Ltd METHOD FOR INFLUENCING THE CHARGE COMPOSITION AND ALTERNATIVE IGNITION ENGINE
DE3511432A1 (en) * 1984-04-07 1985-10-17 Volkswagenwerk Ag, 3180 Wolfsburg Method and arrangement for combustion chamber identification in an internal combustion engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3210810A1 (en) * 1982-03-24 1983-10-06 Mataro Co Ltd METHOD FOR INFLUENCING THE CHARGE COMPOSITION AND ALTERNATIVE IGNITION ENGINE
DE3511432A1 (en) * 1984-04-07 1985-10-17 Volkswagenwerk Ag, 3180 Wolfsburg Method and arrangement for combustion chamber identification in an internal combustion engine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4009285A1 (en) * 1989-08-23 1990-12-20 Audi Ag METHOD FOR CYLINDER SELECTIVE MONITORING OF ENERGY REVENUE IN A MULTI-CYLINDER INTERNAL COMBUSTION ENGINE
US5359518A (en) * 1989-08-23 1994-10-25 Audi Ag Process for monitoring the power output of the individual cylinders of a multicylinder internal combustion engine
DE4122139C2 (en) * 1991-07-04 2000-07-06 Bosch Gmbh Robert Method for cylinder equalization with regard to the fuel injection quantities in an internal combustion engine
US5544636A (en) * 1993-12-16 1996-08-13 Volkswagen Ag Method for obtaining trigger signals to regulate energy conversion in the combustion chamber of an internal combustion engine
US7027910B1 (en) * 2005-01-13 2006-04-11 General Motors Corporation Individual cylinder controller for four-cylinder engine
CN101103192B (en) * 2005-01-13 2012-08-29 通用汽车公司 Indivudual cylinder controller for four-cylinder engine
DE102005001887B3 (en) * 2005-01-14 2006-07-06 Siemens Ag Method for increasing the control range for the equalization of injection quantity differences
US7293545B2 (en) 2005-01-14 2007-11-13 Siemens Aktiengesellschaft Method for enlarging the control range for equalizing injection quantity differences
DE102007030562B4 (en) 2007-06-30 2018-03-15 Volkswagen Ag Method for operating an internal combustion engine

Also Published As

Publication number Publication date
DE3802803C2 (en) 1998-09-17

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