EP0781911B1 - 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 PDFInfo
- Publication number
- EP0781911B1 EP0781911B1 EP96119903A EP96119903A EP0781911B1 EP 0781911 B1 EP0781911 B1 EP 0781911B1 EP 96119903 A EP96119903 A EP 96119903A EP 96119903 A EP96119903 A EP 96119903A EP 0781911 B1 EP0781911 B1 EP 0781911B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- cylinders
- fuel
- throttle valve
- transition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—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 suppression of the one occurring during the transition from train to push operation Jerking one used to drive a motor vehicle Internal combustion engine according to the preamble of the claim.
- DE 35 13 656 A1 is a fuel injection arrangement described for a multi-cylinder engine in which a such procedure is applied.
- the engine cylinders are divided into groups and the groups will meet the requirements switched off in succession for a fuel cut-off, so that the number of working cylinders gradually decreases. This also reduces the engine torque gradually and the jerking of the internal combustion engine can be reduced.
- the invention has for its object a method to improve according to the preamble of the claim that the emission of unburned hydrocarbons is significantly reduced.
- the control unit continuously checks in a first method step 2 whether there is a speed behavior which makes cylinder deactivation expedient. For the intended purpose, this is the case for 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 detected, then a further method step 3 checks whether there is overrun operation. If this is the case, then after a time delay 4 of approximately 0 to 0.5 s, the fuel supply to a cylinder or a first group of cylinders is blocked in a subsequent method step 5. In a four-cylinder internal combustion engine, the fuel supply to a cylinder is preferably blocked.
- step 6 After blocking the fuel supply to a group of In a further process step 6 checked by the control unit whether the requirements are given for a fuel cut-off. Is this the If this is the case, the fuel cut-off is carried out with method step 7 triggered. If one of the conditions for Thrust cut-off gone, then it goes back to normal engine operation 1 or single cylinder shutdown decreased.
- step 3 If it is recognized in method step 3 that there is no overrun operation step 6 is followed, which checks whether the conditions for overrun fuel cut-off available. If this is the case, then follows Method step 7 fuel cut-off; if not, it becomes normal engine operation 1 decreased.
- the advantage of the present invention is particular to see that in addition to a damped torque reduction during the transition from pull to push operation of an internal combustion engine and the jerking of one to be avoided motor vehicle thus driven a stable and complete Combustion of the cylinder charge and therefore one Reduction of unburned hydrocarbon emissions is achieved.
Landscapes
- 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)
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 suppression of the one occurring during the transition from train to push operation Jerking one used to drive a motor vehicle Internal combustion engine according to the preamble of the 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 is a fuel injection arrangement described for a multi-cylinder engine in which a such procedure is applied. In this well-known The engine cylinders are divided into groups and the groups will meet the requirements switched off in succession for a fuel cut-off, so that the number of working cylinders gradually decreases. This also reduces the engine torque gradually 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 absolute pressure occurring in the thrust but the cylinder charge of the still fired Cylinder groups burned incompletely. Thereby the emission of unburned hydrocarbons increases.
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 a method to improve according to the preamble of the 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 characterizing Features mentioned in the claim solved.
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 available Cylinder filling improves with a rich mixture the combustion stability considerably and the tendency to jerk of the vehicle decreases significantly. The cylinder or the cylinder group without injection pumps only air. The the oxygen content contained therein is stored in the catalytic converter and enables the oxidation of the fat mixture the other cylinder. In the sum of all cylinders lean mixture also improve HC and CO emissions at the exhaust pipe end compared to a total mixture von Lambda = 1. The nitrogen oxide conversion deteriorates at the same time. Due to the low raw NOx emissions in the thrust is the influence on the amount of total nitrogen oxides however very low.
Ein Ausführungsbeispiel des erfindungsgemäßen Verfahrens ist nachstehend anhand eines Flußdiagrammes näher erläutert.An 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
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 there is a stable combustion, through which the tendency to jerky decreases significantly. Because during this The time the throttle valve is closed vapors as a result the negative pressure of the fuel wall film of the intake paths quickly. Together with this evaporating amount of fuel and the greased mixture of the fired cylinders and the air pumped by the unfired cylinder there is a corresponding lambda> 1 upstream of the catalytic converter Exhaust gas composition. This lean mixture overall leads to improved HC and CO exhaust gas values a lambda = 1. The nitrogen oxide conversion deteriorates at the same time, but because of the low NOx raw emissions in the thrust is the influence on the total nitrogen oxides are low.
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 blocking the fuel supply to a group of
In a further process step 6
checked by the control unit whether the requirements
are given for a fuel cut-off. Is this the
If this is the case, the fuel cut-off is carried out with method step 7
triggered. If one of the conditions for
Thrust cut-off gone, then it goes back 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 is outside in
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
step 6 is followed,
which checks whether the conditions for overrun fuel cut-off
available. If this is the case, then follows
Method step 7 fuel cut-off; if not, it becomes
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 particular to see that in addition to a damped torque reduction during the transition from pull to push operation of an internal combustion engine and the jerking of one to be avoided motor vehicle thus driven a stable and complete Combustion of the cylinder charge and therefore one Reduction of unburned hydrocarbon emissions is achieved.
Claims (1)
- Method for suppressing the judder of a multi-cylinder internal combustion engine used to drive a motor vehicle, which occurs on changing over from traction to coasting, with a throttle valve for regulating the quantity of intake air, with injection valves controlled sequentially by a control unit for apportioning the fuel for each cylinder, with an exhaust catalytic converter, and with shut-off of the fuel supply to one cylinder or to a first group of cylinders, which cuts in after a short time delay on changing over from traction to coasting and when the throttle valve is closed or almost closed, characterised in that, simultaneously with shut-off of the fuel supply to one cylinder or to a first group of cylinders, the mixture of the remaining cylinders is enriched to such an extent that, when the throttle valve is fully closed, including the fuel wall film of the intake paths which then evaporates, a stoichiometric or slightly lean mixture arises.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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 |
DE19549076 | 1995-12-29 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0781911A2 EP0781911A2 (en) | 1997-07-02 |
EP0781911A3 EP0781911A3 (en) | 1999-03-03 |
EP0781911B1 true EP0781911B1 (en) | 2002-10-02 |
Family
ID=7781606
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96119903A Expired - Lifetime EP0781911B1 (en) | 1995-12-29 | 1996-12-12 | Method to suppress vibrations from an engine driving a vehicle during the transition from acceleration to deceleration |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0781911B1 (en) |
DE (2) | DE19549076A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7415342B2 (en) * | 2005-08-24 | 2008-08-19 | Gm Global Technology Operations, Inc. | Fuel delivery control system |
FR2992361B1 (en) * | 2012-06-22 | 2014-07-11 | Peugeot Citroen Automobiles Sa | METHOD FOR CONTROLLING A HEAT ENGINE |
US9212616B2 (en) | 2012-07-13 | 2015-12-15 | Robert Bosch Gmbh | Fuel shut-off command with adaptive cruise control |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54163226A (en) * | 1978-06-16 | 1979-12-25 | Nissan Motor | Device for controlling number of cylinders to be supplied with fuel |
JPS562432A (en) * | 1979-06-22 | 1981-01-12 | Nissan Motor Co Ltd | Shock reducing device for number of cylinder controlling engine |
JPS5874841A (en) * | 1981-10-28 | 1983-05-06 | Nissan Motor Co Ltd | Cylinder number-controlled engine |
JPS60222537A (en) * | 1984-04-17 | 1985-11-07 | Fuji Heavy Ind Ltd | Fuel cut device for electronic control type fuel injection engine |
GB8425926D0 (en) * | 1984-10-13 | 1984-11-21 | Lucas Ind Plc | Fuel control system |
JPH0623551B2 (en) * | 1984-10-22 | 1994-03-30 | 富士重工業株式会社 | Air-fuel ratio controller for vehicle engine |
DE3521551A1 (en) * | 1985-06-15 | 1986-12-18 | Robert Bosch Gmbh, 7000 Stuttgart | METHOD FOR CONTROLLING AND / OR REGULATING OPERATING CHARACTERISTICS OF AN INTERNAL COMBUSTION ENGINE |
DE3630563A1 (en) * | 1986-09-09 | 1988-03-10 | Bosch Gmbh Robert | Electronic control device for a fuel injection system of an internal combustion engine |
JPH01182552A (en) * | 1988-01-18 | 1989-07-20 | Hitachi Ltd | Device for controlling adaption of air-fuel ratio |
DE3911016A1 (en) * | 1988-04-06 | 1989-10-26 | Ficht Gmbh | Method for the operation of a two-stroke internal combustion engine |
GB9004190D0 (en) * | 1990-02-23 | 1990-04-18 | Lucas Ind Plc | Method and apparatus for controlling engine torque and wheel spin |
JP2583662B2 (en) * | 1990-10-30 | 1997-02-19 | 三菱電機株式会社 | Engine air-fuel ratio control device |
US5119781A (en) * | 1991-02-28 | 1992-06-09 | General Motors Corporation | Control of engine fuel injection during transitional periods associated with deceleration fuel cut-off |
DE69229790T2 (en) * | 1991-12-26 | 1999-12-02 | Mitsubishi Jidosha Kogyo K.K., Tokio/Tokyo | MOTOR VEHICLE ENGINE |
GB9320008D0 (en) * | 1992-10-29 | 1993-11-17 | Daimler Benz Ag | Method for controlling a two-stroke internal combustion engine |
DE4236922C2 (en) * | 1992-10-31 | 2003-05-08 | Bosch Gmbh Robert | Method for setting the fuel / air mixture for an internal combustion engine after a coasting phase |
DE4310145A1 (en) * | 1993-03-29 | 1994-04-07 | Daimler Benz Ag | Multi-cylinder IC engine with at least two groups of cylinders - has individual air-fuel mixture supply, and exhaust gas pipelines assigned to the cylinder groups and opening out into common exhaust gas pipe. |
DE4321333A1 (en) * | 1993-06-26 | 1995-01-05 | Bosch Gmbh Robert | Method and device for controlling a drive unit of a vehicle |
DE4342333C2 (en) * | 1993-12-11 | 2003-06-18 | Bosch Gmbh Robert | Control device for cylinder-specific fuel injection in an internal combustion engine |
-
1995
- 1995-12-29 DE DE19549076A patent/DE19549076A1/en not_active Withdrawn
-
1996
- 1996-12-12 DE DE59609749T patent/DE59609749D1/en not_active Expired - Lifetime
- 1996-12-12 EP EP96119903A patent/EP0781911B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0781911A2 (en) | 1997-07-02 |
DE59609749D1 (en) | 2002-11-07 |
DE19549076A1 (en) | 1997-07-03 |
EP0781911A3 (en) | 1999-03-03 |
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