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EP1009932A1 - Method for controlling and regulating combustion in the combustion chamber of an internal combustion engine - Google Patents

Method for controlling and regulating combustion in the combustion chamber of an internal combustion engine

Info

Publication number
EP1009932A1
EP1009932A1 EP98951200A EP98951200A EP1009932A1 EP 1009932 A1 EP1009932 A1 EP 1009932A1 EP 98951200 A EP98951200 A EP 98951200A EP 98951200 A EP98951200 A EP 98951200A EP 1009932 A1 EP1009932 A1 EP 1009932A1
Authority
EP
European Patent Office
Prior art keywords
combustion
combustion chamber
chamber pressure
cylinder
controlling
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.)
Withdrawn
Application number
EP98951200A
Other languages
German (de)
French (fr)
Inventor
Manfred Mezger
Hubert Bischof
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1009932A1 publication Critical patent/EP1009932A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P5/00—Advancing or retarding ignition; Control therefor
    • F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
    • F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
    • F02P5/15—Digital data processing
    • F02P5/152—Digital data processing dependent on pinking
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/027—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions using knock sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
    • F02D35/024—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure using an estimation
    • 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

Definitions

  • the invention relates to a method for controlling the combustion in the combustion chamber of an internal combustion engine, as is already known from DE 43 41 796 AI. In this known method is in each combustion chamber
  • Internal combustion engine arranged a pressure sensor so that the pressure in the combustion chamber can be detected in a predetermined period.
  • the pressure values during the compression stroke are stored until a predeterminable crank angle is reached and, after passing through the predeterminable crank angle, are output in mirror image in the same time periods, so that the difference between the pressure values still recorded during combustion and the output pressure values during the compression stroke can be formed .
  • the integral of the determined difference and the associated crank angle, at which a predeterminable area share of the integral is reached, forms the basis for determining the deviation of a determined crank angle from a predefined target crank angle, so that the combustion position is regulated on the basis of the determined deviation in the control unit can.
  • Methods are also known, in which detonator detections of the respective work cycle a pressure sensor in the Combustion chamber is arranged, and when a threshold value is exceeded by the sensor signals, it is decided that the cylinder in question is in its combustion cycle. Furthermore, it is known to provide a knock sensor for recognizing the respective work cycle, the signal of which is also compared with a threshold value and, if the threshold value is exceeded, it is concluded that the cylinder in question is in its work cycle.
  • the method according to the invention with the features of the main claim has the advantage over the known that no pressure sensor is to be provided in the combustion chamber, as a result of which additional bores in the cylinder head can be avoided. Furthermore, by reconstructing the combustion chamber pressure curve from the signal of the knock sensor, various operating variables of the internal combustion engine can be detected without additional sensors. With this method, the sensors that are already present can therefore be used to control various parameters.
  • FIG. 1 shows the basic structure of an evaluation unit with control unit for internal combustion engines and
  • FIG. 2 shows the basic method steps for processing the signals of the knock sensors.
  • FIG. 1 shows the schematic structure of an ignition system with knock sensors and evaluation unit.
  • four knock sensors 11 to 12 are each assigned to a single cylinder, not shown here.
  • the knock signal KS detected by each knock sensor 11 to 14 is fed to a downstream evaluation unit 15.
  • the evaluation unit 15 is also supplied with the crankshaft signal KW.
  • the cylinder-specific knock sensor signal is now conditioned in the evaluation unit 15 by means of corresponding evaluation methods, and the combustion chamber pressure curve of these cylinders is thus reconstructed from the measured acoustic signal.
  • the combustion position as is already known from DE 43 41 796 AI, is then determined from the reconstructed combustion chamber pressure curve.
  • the phase position as already described in detail in DE 40 02 228 AI, can be determined on the basis of the reconstructed combustion chamber curve and by comparison with a threshold value.
  • control variables 16 are then output as control variables 16 to a control unit 17, see above that the various control variables, for example for the ignition, are determined in the control unit 17 on the basis of the supplied control variables 16 and further input variables 18, which are determined by sensors not shown here.
  • FIG. 2 shows an overview of the individual process steps.
  • the knock signal KS is detected individually for the cylinder and, on the one hand, is passed on to step 21, in which the combustion chamber pressure curve for this cylinder is reconstructed from the knock signal KS.
  • the knock signal is examined in a step 22 for knocking KL that may have occurred during combustion.
  • an evaluation can then be carried out in various work steps assigned in parallel, either optionally for one or for all work steps.
  • the phase signal is determined in a step 23, the uneven running in a step 24, combustion misfires in a step 25 and the combustion situation in a step 26.
  • the outputs of these work steps 23 to 26 and the output of the knock detection circuit 22 are then guided to a work step 27 for controlling and regulating the subsequent combustion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The invention relates to a method for controlling and regulating combustion in the combustion chamber of an internal combustion engine. According to said method at least one knock sensor detects a cylinder-specific knock signal for each individual cylinder of the internal combustion engine, the knock signal detected in this manner is transmitted to an evaluation circuit which from the knock signal detected reconstructs the combustion chamber pressure profile and said combustion chamber pressure profile is analysed for the purpose of controlling and regulating the next combustion in the cylinder concerned.

Description

Verfahren zur Steuerung und Regelung der Verbrennung im Brennraum einer BrennkraftmaschineMethod for controlling and regulating the combustion in the combustion chamber of an internal combustion engine
Stand der TechnikState of the art
Die Erfindung geht aus von einem Verfahren zur Regelung der Verbrennung im Brennraum einer Brennkraftmaschine, wie es bereits aus der DE 43 41 796 AI bekannt ist. Bei diesem bekannten Verfahren ist in jedem Brennraum derThe invention relates to a method for controlling the combustion in the combustion chamber of an internal combustion engine, as is already known from DE 43 41 796 AI. In this known method is in each combustion chamber
Brennkraftmaschine ein Drucksensor angeordnet, so daß der Druck im Brennraum in einem vorgebbaren Zeitabschnitt erfaßt werden kann. Die Druckwerte während des Kompressionshubes werden dabei bis zum Erreichen eines vorgebbaren Kurbelwinkels gespeichert und nach dem Passieren des vorgebbaren Kurbelwinkel spiegelbildlich in gleichen Zeitabschnitten wieder ausgegeben, so daß die Differenz zwischen dem weiterhin erfaßten Druckwerten während der Verbrennung und den ausgegebenen Druckwerten während des Kompressionshubes gebildet werden kann. Das Integral der ermittelten Differenz und der zugehörige Kurbelwinkel, an dem ein vorgebbarer Flächenanteil des Integrals erreicht ist, bildet die Grundlagen für die Ermittelung der Abweichung eines ermittelten Kurbelwinkels von einem vorgebbaren Soll-Kurbelwinkel, so daß aufgrund der ermittelten Abweichung im Steuergerät die Verbrennungslage geregelt werden kann.Internal combustion engine arranged a pressure sensor so that the pressure in the combustion chamber can be detected in a predetermined period. The pressure values during the compression stroke are stored until a predeterminable crank angle is reached and, after passing through the predeterminable crank angle, are output in mirror image in the same time periods, so that the difference between the pressure values still recorded during combustion and the output pressure values during the compression stroke can be formed . The integral of the determined difference and the associated crank angle, at which a predeterminable area share of the integral is reached, forms the basis for determining the deviation of a determined crank angle from a predefined target crank angle, so that the combustion position is regulated on the basis of the determined deviation in the control unit can.
Es sind weiterhin Verfahren bekannt, bei welchen Zünderkennen des jeweiligen Arbeitstaktes ein Drucksensor im Brennraum angeordnet ist, und beim Überschreiten eines Schwellwertes durch die Sensorsignale darauf beschlossen wird, daß sich der betreffende Zylinder in seinem Verbrennungstakt befindet. Weiterhin ist es bekannt, zum Erkennen des jeweiligen Arbeitstaktes einen Klopfsensor vorzusehen, dessen Signal ebenfalls mit einem Schwellwert verglichen wird und beim Überschreiten des Schwellenwertes daraus geschlossen wird, daß sich der betreffende Zylinder in seinem Arbeitstakt befindet.Methods are also known, in which detonator detections of the respective work cycle a pressure sensor in the Combustion chamber is arranged, and when a threshold value is exceeded by the sensor signals, it is decided that the cylinder in question is in its combustion cycle. Furthermore, it is known to provide a knock sensor for recognizing the respective work cycle, the signal of which is also compared with a threshold value and, if the threshold value is exceeded, it is concluded that the cylinder in question is in its work cycle.
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemäße Verfahren mit den Merkmalen des Hauptanspruch hat gegenüber dem Bekannten den Vorteil, daß kein Drucksensor im Brennraum vorzusehen ist, wodurch zusätzliche Bohrungen im Zylinderkopf vermieden werden können. Desweiteren können durch die Rekonstruktion des Brennraumdruckverlaufes aus dem Signal des Klopfsensors verschiedenen Betriebsgrößen der Brennkraftmaschine ohne zusätzliche Sensoren erfaßt werden. Bei diesem Verfahren können somit die bereits vorhandenen Sensoren für die Regelung verschiedener Parameter verwendet werden.The method according to the invention with the features of the main claim has the advantage over the known that no pressure sensor is to be provided in the combustion chamber, as a result of which additional bores in the cylinder head can be avoided. Furthermore, by reconstructing the combustion chamber pressure curve from the signal of the knock sensor, various operating variables of the internal combustion engine can be detected without additional sensors. With this method, the sensors that are already present can therefore be used to control various parameters.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Verfahren möglich. Besonders vorteilhaft ist, daß anhand des rekonstruierten Brennraumdruckverlaufes eine Laufunruheerkennung, sowie eine Aussetzererkennung, eine Ermittlung der Verbrennungslage und eine Bestimmung der Phasenlage möglich ist. Damit muß von konstruktiver Seite keine Veränderung vorgenommen werden, sondern es kann lediglich durch eine entsprechende Anpassung des Programmablaufes im Steuergerät vorgesehen werden.Advantageous further developments and improvements of the method specified in the main claim are possible through the measures listed in the subclaims. It is particularly advantageous that uneven running detection, misfire detection, determination of the combustion position and determination of the phase position are possible on the basis of the reconstructed combustion chamber pressure curve. This means that no changes need to be made from the design side, but can only be provided by appropriately adapting the program sequence in the control unit.
Zeichnung Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen: Figur 1 den prinzipiellen Aufbau einer Auswerteeinheit mit Steuereinheit für Brennkraftmaschinen und Figur 2 die prinzipiellen Verfahrensschritte zur Verarbeitung der Signale der Klopfsensoren.drawing Embodiments of the invention are shown in the drawing and explained in more detail in the following description. 1 shows the basic structure of an evaluation unit with control unit for internal combustion engines and FIG. 2 shows the basic method steps for processing the signals of the knock sensors.
Beschreibung der AusführungsbeispieleDescription of the embodiments
Figur 1 zeigt den schematischen Aufbau einer Zündanlage mit Klopfsensoren und Auswerteeinheit. Bei der dargestellten Vorrichtung sind vier Klopfsensoren 11 bis 12 jeweils einem einzelnen hier nicht dargestellten Zylindern zugeordnet. Das von jedem Klopfsensor 11 bis 14 erfaßten Klopfsignal KS wird einer nachgeordneten Auswerteeinheit 15 zugeführt. Der Auswerteeinheit 15 ist außerdem das Kurbelwellensignal KW zugeführt. In der Auswerteeinheit 15 wird nun das zylinderindividuellen Klopfsensorsignal mittels entsprechender Auswerteverfahren konditioniert und so aus dem gemessenen akustischen Signal der Brennraumdruckverlauf dieser Zylinders rekonstruiert. Aus dem rekonstruierten Brennraumdruckverlauf wird dann beispielsweise die Verbrennungslage, wie es bereits aus der DE 43 41 796 AI bekannt ist, ermittelt. Desweiteren kann anhand des rekonstruierten Brennraumverlaufs und über den Vergleich mit einem Schwellwert die Phasenlage, wie es bereits ausführlich in der DE 40 02 228 AI beschrieben ist, ermittelt werden. Letztendlich ist es möglich anhand desFigure 1 shows the schematic structure of an ignition system with knock sensors and evaluation unit. In the device shown, four knock sensors 11 to 12 are each assigned to a single cylinder, not shown here. The knock signal KS detected by each knock sensor 11 to 14 is fed to a downstream evaluation unit 15. The evaluation unit 15 is also supplied with the crankshaft signal KW. The cylinder-specific knock sensor signal is now conditioned in the evaluation unit 15 by means of corresponding evaluation methods, and the combustion chamber pressure curve of these cylinders is thus reconstructed from the measured acoustic signal. The combustion position, as is already known from DE 43 41 796 AI, is then determined from the reconstructed combustion chamber pressure curve. Furthermore, the phase position, as already described in detail in DE 40 02 228 AI, can be determined on the basis of the reconstructed combustion chamber curve and by comparison with a threshold value. Ultimately, it is possible using the
Brennraumdruckverlaufes in der Auswerteeinheit eine Aussetzererkennung und eine Laufunruheüberwachung vorzusehen. Die so ermittelten Größen für Phasenlage, Laufunruhe, Aussetzererkennung und Verbrennungslage werden dann als Stellgrößen 16 an ein Steuergerät 17 ausgegeben, so daß in dem Steuergerät 17 anhand der gelieferten Stellgrößen 16 und weiterer Eingangsgrößen 18, die von hier nicht dargestellten Sensoren ermittelt werden, die verschiedenen Steuergrößen beispielsweise für die Zündung bestimmt.Provide misfire detection and uneven running monitoring in the evaluation unit. The variables thus determined for phase position, uneven running, misfire detection and combustion position are then output as control variables 16 to a control unit 17, see above that the various control variables, for example for the ignition, are determined in the control unit 17 on the basis of the supplied control variables 16 and further input variables 18, which are determined by sensors not shown here.
Figur 2 zeigt im Überblick die einzelnen Verfahrensschritte. So wird im ersten Arbeitsschritt 20 das Klopfsignal KS zylinderindividuell erfaßt und zum einen an den Arbeitsschritt 21 weitergeleitet, in welchem aus dem Klopfsignal KS der Brennraumdruckverlauf für diesen Zylinder rekonstruiert wird. Parallel dazu wird das Klopfsignal in einem Arbeitsschritt 22 auf möglicherweise aufgetretenes Klopfen KL bei der Verbrennung untersucht . Nach den im Arbeitsschritt 21 der Brennraumdruckverlauf rekonstruiert wurde, kann anschließend in verschiedenen einander parallel zugeordneten Arbeitsschritten, entweder wahlweise für einen oder für alle Arbeitsschritte eine Auswertung vorgenommen werden. Hierbei wird in einem Arbeitsschritt 23 das Phasensignal, in einem Arbeitsschritt 24 die Laufunruhe, in einem Arbeitsschritt 25 Verbrennungsaussetzer und in einem Arbeitsschritt 26 die Verbrennungslage ermittelt. Die Ausgänge dieser Arbeitsschritte 23 bis 26, sowie der Ausgang der Klopferkennungsschaltung 22 sind dann zur Steuerung und Regelung der darauffolgenden Verbrennung an einen Arbeitsschritt 27 geführt. Figure 2 shows an overview of the individual process steps. In the first step 20, the knock signal KS is detected individually for the cylinder and, on the one hand, is passed on to step 21, in which the combustion chamber pressure curve for this cylinder is reconstructed from the knock signal KS. In parallel, the knock signal is examined in a step 22 for knocking KL that may have occurred during combustion. After the combustion chamber pressure curve has been reconstructed in work step 21, an evaluation can then be carried out in various work steps assigned in parallel, either optionally for one or for all work steps. The phase signal is determined in a step 23, the uneven running in a step 24, combustion misfires in a step 25 and the combustion situation in a step 26. The outputs of these work steps 23 to 26 and the output of the knock detection circuit 22 are then guided to a work step 27 for controlling and regulating the subsequent combustion.

Claims

Ansprüche Expectations
1. Verfahren zur Steuerung und Regelung der Verbrennung im Brennraum einer Brennkraftmaschine, wobei mindestens ein Klopfsensor ein zylinderindividuelles Klopfsignal für jeden Zylinder der Brennkraftmaschine erfaßt, wobei das so erfaßte Klopfsignal einer Auswerteschaltung zugeführt wird, welche aus dem erfaßten Klopfsignal den Brennraumdruckverlauf rekonstruiert , und wobei dieser rekonstruierte Brennraumdruckverlauf für die Steuerung und Regelung der nächsten Verbrennung in diesem Zylinder ausgewertet wird.1. A method for controlling and regulating the combustion in the combustion chamber of an internal combustion engine, wherein at least one knock sensor detects a cylinder-specific knock signal for each cylinder of the internal combustion engine, the knock signal thus detected being fed to an evaluation circuit which reconstructs the combustion chamber pressure curve from the detected knock signal, and this reconstructed combustion chamber pressure curve for the control and regulation of the next combustion in this cylinder is evaluated.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der rekonstruierte Brennraumdruckverlauf auf Phasenlage ausgewertet wird.2. The method according to claim 1, characterized in that the reconstructed combustion chamber pressure curve is evaluated in phase.
3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der rekonstruierte Brennraumdruckverlauf für die Laufunruhe ausgewertet wird.3. The method according to claim 1, characterized in that the reconstructed combustion chamber pressure curve is evaluated for the rough running.
4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der rekonstruierte Brennraumdruckverlauf für die Aussetzererkennung ausgewertet wird.4. The method according to claim 1, characterized in that the reconstructed combustion chamber pressure curve is evaluated for misfire detection.
5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der rekonstruierte Brennraumdruckverlauf für die Ermittelung der Verbrennungslage ausgewertet wird. 5. The method according to claim 1, characterized in that the reconstructed combustion chamber pressure curve is evaluated for the determination of the combustion situation.
EP98951200A 1997-09-06 1998-08-24 Method for controlling and regulating combustion in the combustion chamber of an internal combustion engine Withdrawn EP1009932A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19739085 1997-09-06
DE19739085A DE19739085A1 (en) 1997-09-06 1997-09-06 Method for controlling and regulating the combustion in the combustion chamber of an internal combustion engine
PCT/DE1998/002471 WO1999013217A1 (en) 1997-09-06 1998-08-24 Method for controlling and regulating combustion in the combustion chamber of an internal combustion engine

Publications (1)

Publication Number Publication Date
EP1009932A1 true EP1009932A1 (en) 2000-06-21

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EP98951200A Withdrawn EP1009932A1 (en) 1997-09-06 1998-08-24 Method for controlling and regulating combustion in the combustion chamber of an internal combustion engine

Country Status (6)

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US (1) US6408819B1 (en)
EP (1) EP1009932A1 (en)
JP (1) JP2001515990A (en)
KR (1) KR20010013465A (en)
DE (1) DE19739085A1 (en)
WO (1) WO1999013217A1 (en)

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Also Published As

Publication number Publication date
JP2001515990A (en) 2001-09-25
KR20010013465A (en) 2001-02-26
US6408819B1 (en) 2002-06-25
WO1999013217A1 (en) 1999-03-18
DE19739085A1 (en) 1999-03-11

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