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EP1087121A2 - Fuel injection control method for direct injection diesel engine - Google Patents

Fuel injection control method for direct injection diesel engine Download PDF

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Publication number
EP1087121A2
EP1087121A2 EP00119237A EP00119237A EP1087121A2 EP 1087121 A2 EP1087121 A2 EP 1087121A2 EP 00119237 A EP00119237 A EP 00119237A EP 00119237 A EP00119237 A EP 00119237A EP 1087121 A2 EP1087121 A2 EP 1087121A2
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EP
European Patent Office
Prior art keywords
fuel injection
cylinder
fuel
injection pressure
speed
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
EP00119237A
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German (de)
French (fr)
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EP1087121B1 (en
EP1087121A3 (en
Inventor
Axel Dipl.-Ing. Braun (Th)
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.)
Adam Opel GmbH
Original Assignee
Adam Opel GmbH
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Filing date
Publication date
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Publication of EP1087121A2 publication Critical patent/EP1087121A2/en
Publication of EP1087121A3 publication Critical patent/EP1087121A3/en
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Publication of EP1087121B1 publication Critical patent/EP1087121B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
    • 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
    • F02D41/008—Controlling each cylinder individually
    • F02D41/0085—Balancing of cylinder outputs, e.g. speed, torque or air-fuel ratio

Definitions

  • the invention relates to a method for control the fuel injection at a fast running according to direct injection diesel engine the preamble of claim 1.
  • the object of the present invention is to achieve this based on a method for controlling fuel injection with multi-cylinder high-speed direct injecting diesel engines with solenoid valves cylinder-selectively controlled cam driven Injection pumps, such as B. a distributor injection pump, to create a drop in fuel injection pressure below a predetermined tolerable value too is avoided at low speed and load and so too in this operating area through good fuel conditioning in the combustion chamber a good efficiency and cheap Emission values can be achieved.
  • the invention solves this problem with the features of claim 1.
  • the sub-claims have advantageous Developments of the invention to the subject.
  • the triggering time of the injection valve at least one cylinder set to zero.
  • the control time is in a manner known per se of the other injectors raised so that whose fuel injection quantity increases by an amount which a constant torque of the internal combustion engine backs up.
  • Fuel injection quantity is now sufficient one for fuel processing in the combustion chamber build up sufficiently high injection pressure.
  • the injector size can be selected almost optimally, the compromise between optimal performance and low emissions is defused.
  • the invention is relatively simple by itself Modification of the engine control software can be implemented.
  • Fuel temperature, coolant temperature or oil temperature and air mass as well as the position the accelerator pedal (e.g. in a motor vehicle drive), current engine torque and driving dynamics (i.e. pedal travel depending on the time) can be particularly low dynamic or in steady operating conditions the number of the internal combustion engine depending on the map required injections per cylinder applied become.

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)

Abstract

Triggering time for a magnetic valve determines fuel proportions. One or more cylinders are cut off so that corresponding triggering time for a preset threshold is set at zero. Triggering time for remaining cylinders is increased, so that resulting torque stays constant. Threshold for cylinder cut-off is determined by minimum, allowable fuel injection pressure reached by an up-to-the-minute injected fuel amount per cylinder.

Description

Die Erfindung betrifft ein Verfahren zur Steuerung der Kraftstoffeinspritzung bei einer schnell laufenden direkt einspritzenden Dieselbrennkraftmaschine gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a method for control the fuel injection at a fast running according to direct injection diesel engine the preamble of claim 1.

Ein solches Verfahren ist mit DE 41 26 204 A1 beschrieben. Dieses bekannte Verfahren hat zum Ziel, das Fahrverhalten der Brennkraftmaschine dann zu verbessern, wenn die Kraftstoffzufuhr zumindestens zu einem von mehreren Zylindern unterdrückt wird. Eine solche Unterdrückung der Kraftstoffzufuhr wird nach DE 35 36 207 C2 zu dem Zweck vorgeschlagen, um die in die verbleibenden Verbrennungsräume einzuspritzende Kraftstoffmenge nicht zu klein werden zu lassen, da deren Zumessung mit kleiner werdender Menge zunehmend schwierig wird.Such a method is described in DE 41 26 204 A1 described. The aim of this known method is that Then improve driving behavior of the internal combustion engine, if the fuel supply is at least one of several Cylinders is suppressed. Such oppression the fuel supply is according to DE 35 36 207 C2 the purpose suggested to get into the remaining combustion chambers amount of fuel not to be injected to be small, since their metering is smaller increasing amount becomes increasingly difficult.

Bei einer Dieselbrennkraftmaschine, deren Einspritzpumpe nockengetrieben ist, wobei die Nocken wiederum direkt von der Brennkraftmaschine angetrieben werden, steigt der Einspritzdruck bei einem gegebenen konkreten Querschnitt der Einspritzdüse nur über die Last, das heißt über die zugemessene Kraftstoffeinspritzmenge und über die Drehzahl, das heißt über die Zeit, die zur Einspritzung zur Verfügung steht, an. Um auch bei kleiner Last, das heißt einer kleinen Einspritzmenge, und bei niedriger Drehzahl, das heißt bei einer relativ langen Einspritzdauer, einen ausreichend hohen Einspritzdruck erreichen zu können, wird der Querschnitt der Einspritzdüse möglichst klein ausgelegt. Einer solchen bekannten Vorgehensweise sind jedoch Grenzen gesetzt, da die minimale Einspritzdüsengröße durch die maximal mögliche Spritzdauer für die angestrebten maximalen Leistungswerte der Brennkraftmaschine begrenzt ist. Die Auslegung der Einspritzdüsengröße erfolgt bei nockengetriebener Einspritzung daher als Kompromiss zwischen Leistung und Emission, wobei für keine der beiden Zielwerte ein Optimum zu realisieren ist.In a diesel internal combustion engine, its injection pump is cam-driven, the cams in turn are driven directly by the internal combustion engine, the injection pressure increases for a given concrete Cross section of the injector only over the load, that is, via the metered fuel injection quantity and the speed, that is, the time it takes Injection is available. To even small ones Load, i.e. a small injection quantity, and at low speed, i.e. a relatively long one Injection duration, a sufficiently high injection pressure To be able to achieve the cross section of the injector designed as small as possible. Such a known one There are limits to the procedure, however, since the minimum Injector size by the maximum possible Spray duration for the desired maximum performance values the internal combustion engine is limited. The interpretation of the Injection nozzle size takes place with cam-driven injection therefore as a compromise between performance and Emission, with an optimum for neither of the two target values is to be realized.

Dieser Nachteil ist zwar bei den bekannten Common-Rail-Einspritzsystemen vermeidbar, jedoch ist der Wirkungsgrad der Common-Rail-Einspritzung per se einer Verteilereinspritzpumpe unterlegen, da deren Pumpe ständig gegen den relativ hohen Druck im System arbeiten muss.This disadvantage is true in the known common rail injection systems avoidable, however, that is Efficiency of common rail injection per se Subordinate distributor injection pump, because their pump constantly work against the relatively high pressure in the system got to.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Steuerung der Kraftstoffeinspritzung bei mehrzylindrigen schnell laufenden direkt einspritzenden Dieselbrennkraftmaschinen mit von Magnetventilen zylinderselektiv gesteuerten Nocken getriebenen Einspritzpumpen, wie z. B. einer Verteilereinspritzpumpe, zu schaffen, bei der ein Abfall des Kraftstoffeinspritzdruckes unter einen vorgegebenen tolerierbaren Wert auch bei geringer Drehzahl und Last vermieden wird und so auch in diesem Betriebsbereich durch gute Kraftstoffaufbereitung im Verbrennungsraum ein guter Wirkungsgrad und günstige Abgaswerte erzielt werden. The object of the present invention is to achieve this based on a method for controlling fuel injection with multi-cylinder high-speed direct injecting diesel engines with solenoid valves cylinder-selectively controlled cam driven Injection pumps, such as B. a distributor injection pump, to create a drop in fuel injection pressure below a predetermined tolerable value too is avoided at low speed and load and so too in this operating area through good fuel conditioning in the combustion chamber a good efficiency and cheap Emission values can be achieved.

Die Erfindung löst diese Aufgabe mit den Merkmalen des Anspruches 1. Die Unteransprüche haben vorteilhafte Weiterbildungen der Erfindung zum Gegenstand.The invention solves this problem with the features of claim 1. The sub-claims have advantageous Developments of the invention to the subject.

Gemäß der Erfindung wird bei Erkennen eines Kraftstoffeinspritzdruckes unterhalb einer vorgegebenen Schwelle infolge geringer werdender Drehzahl und/oder Last der Brennkraftmaschine die Ansteuerzeit des Einspritzventils zumindest eines Zylinders auf Null gesetzt. Gleichzeitig wird in an sich bekannter Weise die Ansteuerzeit der anderen Einspritzventile so angehoben, dass deren Kraftstoffeinspritzmenge um ein Maß anwächst, welches ein gleichbleibendes Drehmoment der Brennkraftmaschine sichert. Diese an den arbeitenden Zylindern einzuspritzende Kraftstoffeinspritzmenge ist nun ausreichend, einen für die Kraftstoffaufbereitung im Verbrennungsraum ausreichend hohen Einspritzdruck aufzubauen.According to the invention, when a Fuel injection pressure below a predetermined Threshold due to decreasing speed and / or Load of the internal combustion engine the triggering time of the injection valve at least one cylinder set to zero. At the same time, the control time is in a manner known per se of the other injectors raised so that whose fuel injection quantity increases by an amount which a constant torque of the internal combustion engine backs up. To be injected onto the working cylinders Fuel injection quantity is now sufficient one for fuel processing in the combustion chamber build up sufficiently high injection pressure.

Somit kann bei Teillast der Brennkraftmaschine die Einspritzmasse pro arbeitenden Zylinder angehoben werden, womit sich nicht nur der Einspritzdruck gravierend erhöht, sondern auch der innere Wirkungsgrad der Brennkraftmaschine in diesem Betriebsbereich verbessert wird.Thus, at partial load of the internal combustion engine the injection mass per working cylinder increased not only the injection pressure is serious increased, but also the internal efficiency of the Internal combustion engine improved in this operating area becomes.

Durch den erhöhten Einspritzdruck und der damit verbundenen Verkürzung des Zündverzuges wird die Abgasemission deutlich verbessert. Die Einspritzdüsengröße kann nahezu optimal ausgewählt werden, wobei der Kompromiss zwischen optimaler Leistung und geringer Emission entschärft ist.Due to the increased injection pressure and thus The shortening of the ignition delay is associated with the exhaust gas emission clearly improved. The injector size can be selected almost optimally, the compromise between optimal performance and low emissions is defused.

Die Erfindung ist relativ einfach allein durch Veränderung der Software der Motorsteuerung realisierbar. Durch die Erfassung von Motordrehzahl bzw. Einspritzpumpendrehzahl, Kraftstofftemperatur, Kühlmitteltemperatur bzw. Öltemperatur und Luftmasse sowie über die Stellung des Fahrpedals (z. B. bei einem Kraftfahrzeugantrieb), aktuellem Motormoment und Fahrdynamik (das heißt Pedalweg in Abhängigkeit von der Zeit) können insbesondere bei gering dynamischen bzw. bei stationären Betriebszuständen der Brennkraftmaschine kennfeldabhängig die Anzahl der erforderlichen Einspritzungen pro Zylinder appliziert werden.The invention is relatively simple by itself Modification of the engine control software can be implemented. By detecting engine speed or injection pump speed, Fuel temperature, coolant temperature or oil temperature and air mass as well as the position the accelerator pedal (e.g. in a motor vehicle drive), current engine torque and driving dynamics (i.e. pedal travel depending on the time) can be particularly low dynamic or in steady operating conditions the number of the internal combustion engine depending on the map required injections per cylinder applied become.

Die möglichen Applizierungsarten für Motoren mit vier oder mehr Zylindern auch hinsichtlich einer gleichmäßigen Auslastung aller Zylinder geht aus dem angeführten Stand der Technik hervor.The possible application types for motors with four or more cylinders also with regard to one Even utilization of all cylinders comes from the listed State of the art.

Zur Aufrechterhaltung des aktuellen Motor-Last-Drehzahlzustandes wird die durch das Aussetzen einer Einspritzung benötigte erhöhte Einspritzmasse der darauffolgenden Einspritzung mittels Kennfeldern appliziert, auf welche die Motorsteuerung zurückgreift.To maintain the current engine load speed status is the by suspending an injection required increased injection mass of the following Injection applied using maps which the engine control system uses.

Es hat sich herausgestellt, dass bei Erreichen eines Kraftstoff-Einspritzdruckes von 500 bar an den arbeitenden Zylindern eine Zylinderabschaltung und damit ein Anheben des Einspritzdruckes für die weiterhin arbeitenden Zylinder vorteilhaft ist.It turned out that when reached a fuel injection pressure of 500 bar to the workers Cylinders a cylinder deactivation and thus an increase in injection pressure for those still working Cylinder is advantageous.

Es entspricht der Erfindung, wenn zur Minimierung der Ladungswechselverluste die Ein- und Auslassventile der nicht eingespritzten Zylinder im Zünd-OT durch die elektronische Motorsteuerung abgeschaltet werden.It corresponds to the invention when for minimization the charge exchange losses the intake and exhaust valves the not injected cylinder in the ignition TDC the electronic engine control can be switched off.

Claims (3)

Verfahren zur Steuerung der Kraftstoffeinspritzung bei einer mehrzylindrigen schnell laufenden direkt einspritzenden Dieselbrennkraftmaschine mit zumindest einer von Magnetventilen zylinderselektiv gesteuerten Nocken getriebenen Einspritzpumpe, bei der die Ansteuerzeit des jeweiligen Magnetventils die Kraftstoffzumessung bestimmt, wobei eine Abschaltung wenigstens eines Zylinders derart erfolgt, dass die entsprechende Ansteuerzeit bei einer vorgegebenen Schwelle auf Null gesetzt wird, und dass nach Nullsetzen der Ansteuerzeit für wenigstens einen Zylinder die Ansteuerzeit für die übrigen Zylinder derart erhöht wird, dass das von der Dieselbrennkraftmaschine abgegebenen Drehmoment konstant bleibt, dadurch gekennzeichnet, dass die vorgegebene Schwelle bestimmt wird von einem mit der aktuellen Kraftstoffeinspritzmenge pro Zylinder noch erzielbaren zulässigen minimalen Kraftstoffeinspritzdruck.Method for controlling the fuel injection in a multi-cylinder, high-speed, direct-injection diesel internal combustion engine with at least one injection pump driven by solenoid valves and cam-selectively controlled cam, in which the activation time of the respective solenoid valve determines the fuel metering, with at least one cylinder being switched off in such a way that the corresponding activation time occurs at a predetermined threshold is set to zero, and that after zeroing the drive time for at least one cylinder, the drive time for the other cylinders is increased such that the torque output by the diesel engine remains constant, characterized in that the predetermined threshold is determined by one with the current fuel injection quantity per cylinder still achievable minimum fuel injection pressure. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der noch erzielbare zulässige minimale Kraftstoffeinspritzdruck bestimmt wird durch Drehzahl und Last der Dieselbrennkraftmaschine und die sich dabei einstellende Abgas-Emission, wobei mit zurückgehender Drehzahl und/oder Last und der dabei zurückgehenden Kraftstoffeinspritzmenge und des dadurch gleichzeitig zurückgehenden Einspritzdruckes sowie der damit verbundenen unvollkommenen Kraftstoffaufbereitung im Brennraum und der sich damit einstellenden verschlechternden Abgasemission die Abschaltung zumindest eines Zylinders ausgelöst wird. Method according to Claim 1, characterized in that the permissible minimum fuel injection pressure which can still be achieved is determined by the speed and load of the diesel internal combustion engine and the resulting exhaust gas emission, with the speed and / or load decreasing and the fuel injection quantity declining and thereby simultaneously decreasing Injection pressure and the associated imperfect fuel processing in the combustion chamber and the resulting deteriorating exhaust gas emission, the shutdown of at least one cylinder is triggered. Verfahren nach Anspruch 1 und 2, dadurch gekennzeichnet, dass eine Zylinderabschaltung vor Absinken des Kraftstoffeinspritzdruckes an den arbeitenden Zylindern unter einen zulässigen Wert von 500 bar erfolgt.Method according to claims 1 and 2, characterized in that a cylinder deactivation takes place before the fuel injection pressure on the working cylinders drops below a permissible value of 500 bar.
EP00119237A 1999-09-22 2000-09-06 Fuel injection control method for direct injection diesel engine Expired - Lifetime EP1087121B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19945375A DE19945375A1 (en) 1999-09-22 1999-09-22 Method for controlling the fuel injection in a direct injection diesel engine
DE19945375 1999-09-22

Publications (3)

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EP1087121A2 true EP1087121A2 (en) 2001-03-28
EP1087121A3 EP1087121A3 (en) 2003-05-02
EP1087121B1 EP1087121B1 (en) 2004-11-10

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EP00119237A Expired - Lifetime EP1087121B1 (en) 1999-09-22 2000-09-06 Fuel injection control method for direct injection diesel engine

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DE (2) DE19945375A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110462187A (en) * 2017-02-16 2019-11-15 通用全球采购有限责任公司 The method and system of igniting is skipped for engine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4126204A1 (en) * 1991-08-08 1993-02-11 Bosch Gmbh Robert METHOD FOR CONTROLLING FUEL INJECTION IN A DIESEL INTERNAL COMBUSTION ENGINE
DE4243541A1 (en) * 1992-12-22 1994-06-23 Kloeckner Humboldt Deutz Ag Fuel injection system for diesel engine
EP0764777A2 (en) * 1995-09-23 1997-03-26 Robert Bosch Gmbh Method and apparatus for controlling an internal combustion engine
FR2762358A1 (en) * 1997-04-16 1998-10-23 Peugeot Control of operation of diesel engine fitted to motor vehicle
US5954032A (en) * 1996-12-12 1999-09-21 Daimlerchrysler Ag Control of an injection system for a multicylinder internal combustion engine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5394851A (en) * 1992-09-18 1995-03-07 General Electric Company Electronic fuel injection system for large compression ignition engine
DE19619324B4 (en) * 1995-10-07 2006-08-17 Robert Bosch Gmbh Method and device for controlling a drive unit of a vehicle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4126204A1 (en) * 1991-08-08 1993-02-11 Bosch Gmbh Robert METHOD FOR CONTROLLING FUEL INJECTION IN A DIESEL INTERNAL COMBUSTION ENGINE
DE4243541A1 (en) * 1992-12-22 1994-06-23 Kloeckner Humboldt Deutz Ag Fuel injection system for diesel engine
EP0764777A2 (en) * 1995-09-23 1997-03-26 Robert Bosch Gmbh Method and apparatus for controlling an internal combustion engine
US5954032A (en) * 1996-12-12 1999-09-21 Daimlerchrysler Ag Control of an injection system for a multicylinder internal combustion engine
FR2762358A1 (en) * 1997-04-16 1998-10-23 Peugeot Control of operation of diesel engine fitted to motor vehicle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110462187A (en) * 2017-02-16 2019-11-15 通用全球采购有限责任公司 The method and system of igniting is skipped for engine

Also Published As

Publication number Publication date
EP1087121B1 (en) 2004-11-10
DE19945375A1 (en) 2001-03-29
EP1087121A3 (en) 2003-05-02
DE50008580D1 (en) 2004-12-16

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