EP0781911A2 - Method to suppress vibrations from an engine driving a vehicle during the transition from acceleration to deceleration - Google Patents

Method to suppress vibrations from an engine driving a vehicle during the transition from acceleration to deceleration Download PDF

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Publication number
EP0781911A2
EP0781911A2 EP96119903A EP96119903A EP0781911A2 EP 0781911 A2 EP0781911 A2 EP 0781911A2 EP 96119903 A EP96119903 A EP 96119903A EP 96119903 A EP96119903 A EP 96119903A EP 0781911 A2 EP0781911 A2 EP 0781911A2
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EP
European Patent Office
Prior art keywords
cylinder
fuel
transition
cylinders
throttle valve
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Granted
Application number
EP96119903A
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German (de)
French (fr)
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EP0781911B1 (en
EP0781911A3 (en
Inventor
Helmut Dipl.-Ing. Oswald
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Adam Opel GmbH
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Adam Opel GmbH
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Publication of EP0781911A2 publication Critical patent/EP0781911A2/en
Publication of EP0781911A3 publication Critical patent/EP0781911A3/en
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Publication of EP0781911B1 publication Critical patent/EP0781911B1/en
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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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of the engine
    • 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
    • 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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/12—Introducing corrections for particular operating conditions for deceleration
    • F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off

Definitions

  • the invention relates to a method for suppressing the jerking occurring during the transition from pulling to pushing operation of an internal combustion engine used to drive a motor vehicle according to the preamble of the patent claim.
  • DE 35 13 656 A1 describes a fuel injection arrangement for a multi-cylinder engine, in which such a method is used.
  • the cylinders of the engine are divided into groups and the groups are switched off in succession if the conditions for a fuel cut-off are met, so that the number of working cylinders gradually decreases.
  • the engine torque is thus also gradually reduced and the jerking of the internal combustion engine can be reduced.
  • the invention has for its object to improve a method according to the preamble of claim. that the emission of unburned hydrocarbons is significantly reduced.
  • the combustion stability improves considerably with a rich mixture and the tendency of the vehicle to jerky decreases significantly.
  • the cylinder or cylinder group without injection pumps only air.
  • the nitrogen oxide conversion worsens at the same time.
  • due to the low raw NOx emissions in the thrust the influence on the amount of total nitrogen oxides is very small.
  • the control unit constantly checks in a first method step 2 whether there is a speed behavior which makes cylinder deactivation expedient. For the intended purpose, this is available at engine speeds between idling speed and a speed of idling plus approx. 200 min -1 , whereby this speed value, like the idling speed, can also be variable depending on the engine temperature. If such a speed is recognized, then a further method step 3 checks whether there is overrun operation. If this is the case, then after a time delay 4 the fuel supply to a cylinder or a first group of cylinders is blocked from about 0 to 0.5 s in a subsequent method step 5. In a four-cylinder internal combustion engine, the fuel supply to a cylinder is preferably blocked.
  • control unit After the fuel supply to a group of cylinders has been blocked, the control unit checks in a further method step 6 whether the requirements for an overrun fuel cut-off are met. If this is the case, then the fuel cutoff is triggered with method step 7. If one of the conditions for overrun cut-off no longer applies, normal engine operation 1 or single-cylinder cut-out is reverted to.
  • method step 2 If a speed outside the speed provided for a cylinder deactivation is detected in method step 2, then it is checked according to method step 6 whether the conditions for overrun cut-off exist. If this is the case, then fuel cutoff takes place after method step 7; if not, normal engine operation 1 is reverted to.
  • method step 3 If it is recognized in method step 3 that there is no overrun operation, the method goes to method step 6, in which it is checked whether the conditions for overrun cut-off exist. If this is the case, fuel cutoff takes place after method step 7; if not, normal engine operation 1 is reverted to.
  • the advantage of the present invention is to be seen in particular in the fact that, in addition to damped torque reduction during the transition from pull to push operation of an internal combustion engine and the jerking of a motor vehicle driven thereby, a stable and complete combustion of the cylinder charge and thus a reduction in the emission of unburned hydrocarbons is achieved.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Abstract

The backfire prevention method allows the fuel feed provided by the fuel injection valves to be disconnected for a selected cylinder or cylinder group when the throttle valve is moved into a closed or approximately closed position after a given delay. The fuel mixture to the remaining cylinders or cylinder groups is adjusted by the fuel injection control simultaneously with the cut-out of the fuel to the selected cylinder or cylinder group

Description

Die Erfindung betrifft ein Verfahren zur Unterdrückung des beim Übergang von Zug- auf Schubbetrieb auftretenden Ruckelns einer zum Antrieb eines Kraftfahrzeuges dienenden Brennkraftmaschine gemäß dem Oberbegriff des Patentanspruchs.The invention relates to a method for suppressing the jerking occurring during the transition from pulling to pushing operation of an internal combustion engine used to drive a motor vehicle according to the preamble of the patent claim.

Mit DE 35 13 656 A1 ist eine Brennstoff-Einspritzanordnung für einen Mehrzylindermotor beschrieben, bei der ein solches Verfahren angewendet wird. Bei diesem bekannten Verfahren werden die Zylinder des Motors in Gruppen aufgeteilt und die Gruppen werden bei Vorliegen der Voraussetzungen für eine Schubabschaltung nacheinander abgeschaltet, so daß die Zahl der arbeitenden Zylinder allmählich abnimmt. Damit verringert sich auch das Motordrehmoment allmählich und das Ruckeln der Brennkraftmaschine kann reduziert werden.DE 35 13 656 A1 describes a fuel injection arrangement for a multi-cylinder engine, in which such a method is used. In this known method, the cylinders of the engine are divided into groups and the groups are switched off in succession if the conditions for a fuel cut-off are met, so that the number of working cylinders gradually decreases. The engine torque is thus also gradually reduced and the jerking of the internal combustion engine can be reduced.

Bei den im Schub auftretenden niedrigen Saugrohrabsolutdrücken wird aber die Zylinderladung der noch gefeuerten Zylindergruppen nur unvollständig verbrannt. Dadurch steigt die Emission unverbrannter Kohlenwasserstoffe.At the low intake manifold pressures that occur in the overrun, the cylinder charge of the still fired cylinder groups is only incompletely burned. This increases the emission of unburned hydrocarbons.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren nach dem Oberbegriff des Patentanspruches so zu verbessern, daß die Emission unverbrannter Kohlenwasserstoffe deutlich reduziert wird.The invention has for its object to improve a method according to the preamble of claim. that the emission of unburned hydrocarbons is significantly reduced.

Diese Aufgabe wird erfindungsgemäß durch die im kennzeichnenden Teil des Patentanspruches genannten Merkmale gelöst.This object is achieved by the features mentioned in the characterizing part of the claim.

Vor allem im Schubbetrieb mit der dabei vorliegenden geringen Zylinderfüllung verbessert sich mit fettem Gemisch die Verbrennungsstabilität erheblich und die Ruckelneigung des Fahrzeuges nimmt deutlich ab. Der Zylinder bzw. die Zylindergruppe ohne Einspritzung pumpt nur Luft. Der darin enthaltene Sauerstoffanteil wird im Katalysator gespeichert und ermöglicht die Oxidation des fetten Gemisches der anderen Zylinder. Bei in der Summe aller Zylinder magerem Gemisch verbessern sich auch die HC- und CO-Emissionen am Abgasrohrende gegenüber einem Gesamtgemisch von Lambda = 1. Die Stickoxidkonvertierung verschlechtert sich zwar gleichzeitig. Aufgrund der niedrigen NOx-Rohemissionen im Schub ist der Einfluß auf die Menge der Gesamtstickoxide jedoch sehr gering.Especially in overrun mode with the low cylinder filling present, the combustion stability improves considerably with a rich mixture and the tendency of the vehicle to jerky decreases significantly. The cylinder or cylinder group without injection pumps only air. The oxygen content contained therein is stored in the catalytic converter and enables the oxidation of the rich mixture of the other cylinders. If the mixture of all cylinders is lean, the HC and CO emissions at the end of the exhaust pipe also improve compared to a total mixture of lambda = 1. The nitrogen oxide conversion worsens at the same time. However, due to the low raw NOx emissions in the thrust, the influence on the amount of total nitrogen oxides is very small.

Ein Ausführungsbeispiel des erfindungsgemäßen Verfahrens ist nachstehend anhand eines Flußdiagrammes näher erläutert.An exemplary embodiment of the method according to the invention is explained in more detail below with the aid of a flow chart.

Die Steuereinheit prüft während des normalen Motorbetriebes 1 in einem ersten Verfahrensschritt 2 ständig, ob ein Drehzahlverhalten vorliegt, welches eine Zylinderabschaltung zweckmäßig macht. Dieses liegt für den angestrebten Zweck vor bei Motordrehzahlen zwischen Leerlaufdrehzahl und einer Drehzahl von Leerlauf plus ca. 200 min-1, wobei dieser Drehzahlwert so wie die Leerlaufdrehzahl auch variabel in Abhängigkeit von der Motortemperatur sein kann. Wird eine solche Drehzahl erkannt, dann wird in einem weiteren Verfahrensschritt 3 geprüft, ob Schubbetrieb gegeben ist. Ist dies der Fall, dann wird nach einem Zeitverzug 4 von etwa 0 bis 0,5 s in einem folgenden Verfahrensschritt 5 die Kraftstoffzufuhr zu einem Zylinder oder einer ersten Gruppe von Zylindern gesperrt. Bei einer Vier-Zylinder-Brennkraftmaschine wird vorzugsweise die Kraftstoffzufuhr zu einem Zylinder gesperrt. Gleichzeitig wird in diesem Verfahrensschritt 5 das Gemisch der noch befeuerten Zylinder angefettet auf einen Wert von Lambda = 0,7 bis 0,9. Dieser Zustand wird solange aufrechterhalten, bis wieder Gas gegeben wird oder die Drehzahl unter den für die Zylinderabschaltung nach dem Verfahrensschritt 2 definierten Wert sinkt.During normal engine operation 1, the control unit constantly checks in a first method step 2 whether there is a speed behavior which makes cylinder deactivation expedient. For the intended purpose, this is available at engine speeds between idling speed and a speed of idling plus approx. 200 min -1 , whereby this speed value, like the idling speed, can also be variable depending on the engine temperature. If such a speed is recognized, then a further method step 3 checks whether there is overrun operation. If this is the case, then after a time delay 4 the fuel supply to a cylinder or a first group of cylinders is blocked from about 0 to 0.5 s in a subsequent method step 5. In a four-cylinder internal combustion engine, the fuel supply to a cylinder is preferably blocked. At the same time, in this method step 5 the mixture of the still fired cylinders is enriched to a value of lambda = 0.7 to 0.9. This state is maintained until the gas is turned on again or the speed drops below the value defined for the cylinder deactivation after method step 2.

Infolge des fetten Gemisches in den gefeuerten Zylindern wird dort eine stabile Verbrennung erzielt, durch welche die Ruckelneigung deutlich abnimmt. Da während dieser Zeit die Drosselklappe geschlossen ist, dampft infolge des Unterdruckes der Kraftstoff-Wandfilm der Ansaugwege schnell ab. Zusammen mit dieser abdampfenden Kraftstoffmenge und dem angefetteten Gemisch der gefeuerten Zylinder sowie der vom ungefeuerten Zylinder gepumpten Luft ergibt sich vor dem Katalysator eine Lambda > 1 entsprechende Abgaszusammensetzung. Dieses in Summe magere Gemisch führt zu verbesserten HC- und CO-Abgaswerten gegenüber einem Lambda = 1. Die Stickoxidkonvertierung verschlechtert sich zwar gleichzeitig, jedoch aufgrund der niedrigen NOx-Rohemissionen im Schub ist der Einfluß auf die Gesamtstickoxide gering.As a result of the rich mixture in the fired cylinders, stable combustion is achieved there, which significantly reduces the tendency to jerk. Since the throttle valve is closed during this time, the fuel wall film of the intake paths evaporates quickly due to the negative pressure. Together with this evaporating fuel quantity and the enriched mixture of the fired cylinders as well as the air pumped by the unfired cylinder, an exhaust gas composition corresponding to Lambda> 1 results in front of the catalytic converter. This lean mixture leads to improved HC and CO exhaust gas values compared to a lambda = 1. The nitrogen oxide conversion deteriorates at the same time, but due to the low raw NOx emissions in the thrust, the influence on the total nitrogen oxides is small.

Nach dem Sperren der Kraftstoffzufuhr zu einer Gruppe von Zylindern wird in einem weiteren Verfahrensschritt 6 durch die Steuereinheit geprüft, ob die Voraussetzungen für eine Schubabschaltung gegeben sind. Ist dies der Fall, dann wird mit dem Verfahrensschritt 7 die Schubabschaltung ausgelöst. Fällt eine der Bedingungen für Schubabschaltung weg, dann wird auf normalen Motorbetrieb 1 oder Einzelzylinderabschaltung zurückgegangen.After the fuel supply to a group of cylinders has been blocked, the control unit checks in a further method step 6 whether the requirements for an overrun fuel cut-off are met. If this is the case, then the fuel cutoff is triggered with method step 7. If one of the conditions for overrun cut-off no longer applies, normal engine operation 1 or single-cylinder cut-out is reverted to.

Wird bei dem Verfahrensschritt 2 eine Drehzahl außerhalb der für eine Zylinderabschaltung vorgesehenen Drehzahl erkannt, dann wird gemäß Verfahrensschritt 6 geprüft, ob die Bedingungen für Schubabschaltung vorliegen. Wenn dies der Fall ist, dann erfolgt nach Verfahrensschritt 7 Schubabschaltung; wenn nicht, wird zu normalem Motorbetrieb 1 zurückgegangen.If a speed outside the speed provided for a cylinder deactivation is detected in method step 2, then it is checked according to method step 6 whether the conditions for overrun cut-off exist. If this is the case, then fuel cutoff takes place after method step 7; if not, normal engine operation 1 is reverted to.

Wird bei dem Verfahrensschritt 3 erkannt, daß kein Schubbetrieb vorliegt, wird auf Verfahrensschritt 6 gegangen, bei dem geprüft wird, ob die Bedingungen für Schubabschaltung vorliegen. Wenn dies der Fall ist, erfolgt nach Verfahrensschritt 7 Schubabschaltung; wenn nicht, wird zu normalem Motorbetrieb 1 zurückgegangen.If it is recognized in method step 3 that there is no overrun operation, the method goes to method step 6, in which it is checked whether the conditions for overrun cut-off exist. If this is the case, fuel cutoff takes place after method step 7; if not, normal engine operation 1 is reverted to.

Der Vorteil der vorliegenden Erfindung ist insbesondere darin zu sehen, daß neben einem gedämpften Drehmomentabbau beim Übergang von Zug- auf Schubbetrieb einer Brennkraftmaschine und dem damit zu vermeidenden Ruckeln eines damit angetriebenen Kraftfahrzeugs eine stabile und vollständige Verbrennung der Zylinderladung und damit eine Reduzierung der Emission unverbrannter Kohlenwasserstoffe erzielt wird.The advantage of the present invention is to be seen in particular in the fact that, in addition to damped torque reduction during the transition from pull to push operation of an internal combustion engine and the jerking of a motor vehicle driven thereby, a stable and complete combustion of the cylinder charge and thus a reduction in the emission of unburned hydrocarbons is achieved.

Claims (1)

Verfahren zur Unterdrückung des beim Übergang von Zug- auf Schubbetrieb auftretenden Ruckelns einer zum Antrieb eines Kraftfahrzeuges dienenden mehrzylindrigen Brennkraftmaschine mit einer Drosselklappe zum Regeln der Ansaugluftmenge, mit sequentiell durch eine Steuereinheit angesteuerten Einspritzventilen für die Zumessung des Kraftstoffes für jeden Zylinder, mit einem Abgaskatalysator sowie mit einer beim Übergang von Zug- auf Schubbetrieb und geschlossener oder nahezu geschlossener Drosselklappe mit kurzem Zeitverzug einsetzender Abschaltung der Kraftstoffzufuhr zu einem Zylinder oder einer ersten Gruppe von Zylindern, dadurch gekennzeichnet, daß gleichzeitig mit der Abschaltung der Kraftstoffzufuhr zu dem ersten Zylinder oder einer ersten Gruppe von Zylindern das Gemisch der restlichen Zylinder soweit angefettet wird, daß sich bei vollständig geschlossener Drosselklappe einschließlich des dann abdampfenden Kraftstoff-Wandfilmes der Ansaugwege ein stöchiometrisches oder leicht mageres Gemisch einstellt.Method for suppressing the jerking occurring during the transition from pulling to pushing operation of a multi-cylinder internal combustion engine serving to drive a motor vehicle with a throttle valve for regulating the amount of intake air, with injectors sequentially controlled by a control unit for metering the fuel for each cylinder, with an exhaust gas catalytic converter and with a switching off of the fuel supply to a cylinder or a first group of cylinders, which occurs at the transition from pulling operation to pushing operation and closed or almost closed throttle valve with a short time delay, characterized in that simultaneously with the switching off of the fuel supply to the first cylinder or a first group of Cylinders the mixture of the remaining cylinders is enriched to such an extent that when the throttle valve is completely closed, including the then evaporating fuel wall film of the intake paths, a stoichiometric or le not lean mixture.
EP96119903A 1995-12-29 1996-12-12 Method to suppress vibrations from an engine driving a vehicle during the transition from acceleration to deceleration Expired - Lifetime EP0781911B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19549076 1995-12-29
DE19549076A DE19549076A1 (en) 1995-12-29 1995-12-29 Method for suppressing the jerking of an internal combustion engine used to drive a motor vehicle during the transition from pull to push operation

Publications (3)

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EP0781911A2 true EP0781911A2 (en) 1997-07-02
EP0781911A3 EP0781911A3 (en) 1999-03-03
EP0781911B1 EP0781911B1 (en) 2002-10-02

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
FR2992361A1 (en) * 2012-06-22 2013-12-27 Peugeot Citroen Automobiles Sa Method for controlling multi-cylinder thermal engine in car, involves determining corrected richness from reference cylinder richness and number of effective cylinders, where corrected richness complies with exhaust richness
WO2014011350A3 (en) * 2012-07-13 2014-03-20 Robert Bosch Gmbh Fuel shut-off command with adaptive cruise control

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US7415342B2 (en) * 2005-08-24 2008-08-19 Gm Global Technology Operations, Inc. Fuel delivery control system

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DE3513656A1 (en) 1984-04-17 1985-10-24 Fuji Jukogyo K.K., Tokio/Tokyo FUEL INJECTION ARRANGEMENT FOR A MULTI-CYLINDER ENGINE

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Publication number Priority date Publication date Assignee Title
FR2992361A1 (en) * 2012-06-22 2013-12-27 Peugeot Citroen Automobiles Sa Method for controlling multi-cylinder thermal engine in car, involves determining corrected richness from reference cylinder richness and number of effective cylinders, where corrected richness complies with exhaust richness
WO2014011350A3 (en) * 2012-07-13 2014-03-20 Robert Bosch Gmbh Fuel shut-off command with adaptive cruise control
US9212616B2 (en) 2012-07-13 2015-12-15 Robert Bosch Gmbh Fuel shut-off command with adaptive cruise control

Also Published As

Publication number Publication date
DE19549076A1 (en) 1997-07-03
EP0781911B1 (en) 2002-10-02
DE59609749D1 (en) 2002-11-07
EP0781911A3 (en) 1999-03-03

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