EP0272290B2 - Fuel metering process - Google Patents

Fuel metering process Download PDF

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Publication number
EP0272290B2
EP0272290B2 EP87903861A EP87903861A EP0272290B2 EP 0272290 B2 EP0272290 B2 EP 0272290B2 EP 87903861 A EP87903861 A EP 87903861A EP 87903861 A EP87903861 A EP 87903861A EP 0272290 B2 EP0272290 B2 EP 0272290B2
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Prior art keywords
fuel
acceleration
injected
state
injection
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Expired - Lifetime
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EP87903861A
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German (de)
French (fr)
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EP0272290B1 (en
EP0272290A1 (en
Inventor
Helmut Gross
Wolfgang HÖPTNER
Günther KAISER
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/10—Introducing corrections for particular operating conditions for acceleration
    • 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
    • F02D41/10—Introducing corrections for particular operating conditions for acceleration
    • F02D41/105—Introducing corrections for particular operating conditions for acceleration using asynchronous injection
    • 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
    • F02D41/32—Controlling fuel injection of the low pressure type
    • F02D41/34—Controlling fuel injection of the low pressure type with means for controlling injection timing or duration

Definitions

  • the invention relates to a method for fuel allocation during acceleration processes in a plurality of cylinders of an internal combustion engine according to the preamble of the main claim.
  • US Pat. No. 4,463,732 discloses an injection control system in which an extension of the current injection is provided after detection of an acceleration request, otherwise an intermediate spatter is metered.
  • DE 30 12 424 C2 relates to a "fuel injection control device for an internal combustion engine", in which, following an acceleration detection, the subsequent fuel injection occurs at the next reference signal. (Column 2, line 60ff).
  • US-A-4 541 388 shows a fuel injection control unit with the feature of an acceleration enrichment, in which the injection start angle can be advanced, among other things, depending on the speed according to a specified formula (column 4, lines 62 to column 5, line 30).
  • the method according to the invention for allocating fuel during acceleration processes with the characterizing features of the main claim has the advantage over the known method that an immediate and rapid allocation of the amount of fuel corresponding to the state of acceleration takes place and thus also enables an improvement in fuel processing.
  • the difference quantity to the fuel quantity determined in the previous work cycle is determined. This excess is allocated to the cylinders whose regular fuel injection has started and whose intake stroke has not yet been completed. This takes place on the one hand in the form of additional fuel injections for cylinders whose fuel allocation has been completed or by extending current fuel injections by the calculated additional quantity.
  • the injection valves for all fuel injections are immediately opened.
  • particular importance is attached to a rapid allocation of the increased fuel quantity. This takes place primarily the termination of a fuel injection predetermined by the advance angle.
  • the sequential injections of the set amount of fuel take place in a predetermined sequence at a time dependent on the operating point of the internal combustion engine within the work cycle specified by the trigger signal.
  • the fuel injections, the beginning of which was still in the future before the acceleration state was recognized, are provided earlier than for a steady-state operating state or are started immediately in order to ensure that the injection process is ended before the inlet valve closes.
  • the method according to the invention is shown in the drawing and is explained in more detail in the description below.
  • the drawing shows a time diagram of the fuel allocation after detection of an acceleration state.
  • the trigger signals TS being shown in the top line.
  • This trigger signal TS is shifted early by an application-specific angle with respect to the top dead centers of the individual cylinders.
  • the time period TK corresponds to a crankshaft rotation of 180 °.
  • the opening times of the intake valves V1 to V4 are shown for each of the cylinders 1 to 4.
  • the operating state of the internal combustion engine is recorded synchronously with the trigger signal TS.
  • the definition of the acceleration state is based on the ak current operating state and the data of previous operating states, in particular the load, load changes, speed, etc. are recorded.
  • the fuel allocation is increased by an additional amount appropriate to the respective acceleration state during the acceleration state of the internal combustion engine.
  • the allocation takes place for all the cylinders whose regular fuel allocation has started and whose intake process has not yet ended, ie the inlet valve is not yet closed. It is assumed below that the acceleration state is recognized at time t.
  • the inlet valve V2 is just opened by the cylinder 2.
  • an additional fuel injection called an intermediate spray
  • the on-time fuel injection which is represented by the signal d, takes place again in the same cylinder, adapted to the new load.
  • the on-schedule sequential fuel injection takes place in accordance with the fuel quantity, the battery voltage, the advance angle and the speed. The advance angle determines the position of the end of the sequential injection with respect to the opening of the associated intake valve.
  • the next fuel injection which is indicated by the signal c, is started immediately in the cylinder 4.
  • the injection would normally only have started at a later point in time, ie without the acceleration state having been recognized and without the method according to the invention becoming effective. Due to the illustrated immediate start of fuel injection, the amount of fuel corresponding to the acceleration state is allocated quickly according to the invention.

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

Abstract

Process for metering fuel during acceleration in a plurality of cylinders of an internal combustion engine with sequenced injection. The quantity of fuel to be injected is determined on the basis of the engine speed and acceleration, whereby after determination of the acceleration additional fuel is injected. An improvement in this process should enable a faster metering of the increased quantity of fuel injected into the engine during the acceleration process. For this purpose, the calculated quantity of fuel is injected into at least one cylinder and preferably into those cylinders for which the injected quantity has not yet been drawn in and whose intake valve has not yet been closed or whose intake cycle has not yet been completed. This takes place in particular at the moment when a trigger signal (TS) is produced corresponding to the determined quantity of additional fuel for acceleration.

Description

Stand der TechnikState of the art

Die Erfindung betrifft ein Verfahren zur Kraftstoffzuteilung während Beschleunigungsvorgängen in einer Mehrzahl von Zylindern einer Brennkraftmaschine nach der Gattung des Hauptanspruchs.The invention relates to a method for fuel allocation during acceleration processes in a plurality of cylinders of an internal combustion engine according to the preamble of the main claim.

AusderDE-A-34 18 387 ist ein ,,Steuerverfahren zu Kraftstoffeinspritzung bei mehrzylindrigen Brennkraftmaschinen vom sequentiellen Einspritztyp bei der Beschleunigung" bekannt. Dort wird die Menge des an die Maschine gelieferten Kraftstoffes auf einen für den ermittelten Betriebszustand geeigneten Wert jeweils nach der Erzeugung eines Triggersignales eingestellt und die sequentiellen Einspritzungen der derart eingestellten Kraftstoffmenge werden in einer vorbestimmten Folge synchron mit dem Triggersignal bewirkt. Beim Erkennen des Beschleunigungszustandes wird ein sogenannter Zwsichenspritzer für denjenigen Zylinder bereitgestellt, dessen Einlassventil noch nicht wieder geschlossen hatte und demzufolge auch eine zusätzliche Kraftstoffmenge aufnehmen kann. Bei Einspritzungen, die erst im Anschluss an die Beschleunigungserkennung beginnen, ist für die Einspritzung beim nächstliegenden Zylinder ein Zwischenspritzer vorgesehen und bei den folgenden dann eine Einspritzzeitverlängerung (siehe Figur 3).From DE-A-34 18 387 a "control method for fuel injection in multi-cylinder internal combustion engines of the sequential injection type during acceleration" is known. There, the amount of fuel supplied to the engine is adjusted to a value suitable for the determined operating state after the generation of a trigger signal and the sequential injections of the fuel quantity set in this way are effected in a predetermined sequence in synchronism with the trigger signal.When the acceleration state is recognized, a so-called double-spray is provided for the cylinder whose intake valve has not yet closed again and can therefore also take up an additional fuel quantity Injections that only begin after the acceleration detection are provided for the intermediate cylinder for the injection of an intermediate spatter and then for the subsequent ones an injection time extension (see Figure 3).

Die US-PS 4 463 732 offenbart ein Einspritzsteuersystem, bei dem nach Erkennen einer Beschleunigungsanforderung eine Verlängerung der gerade laufenden Einspritzung vorgesehen ist, ansonsten ein Zwischenspritzer zugemessen wird.US Pat. No. 4,463,732 discloses an injection control system in which an extension of the current injection is provided after detection of an acceleration request, otherwise an intermediate spatter is metered.

Die DE 30 12 424 C2 betrifft eine "Kraftstoffeinspritzsteuereinrichtung für eine Brennkraftmaschine", bei dem im Anschluß an eine Beschleunigungserkennung die nachfolgende Kraftstoffeinspritzung beim nächstfolgenden Bezugssignal auftritt. (Spalte 2, Zeile 60ff).DE 30 12 424 C2 relates to a "fuel injection control device for an internal combustion engine", in which, following an acceleration detection, the subsequent fuel injection occurs at the next reference signal. (Column 2, line 60ff).

Ferner zeigt die US-A-4 541 388 eine Kraftstoffeinspritzsteuereinheit mit dem Merkmal einer Beschleunigungsanreicherung, bei der der Einspritzbeginnwinkel entsprechend einer angegebenen Formel unter anderem drehzahlabhängig vorverlegbar ist (Spalte 4, Zeilen 62 bis Spalte 5, Zeile 30).Furthermore, US-A-4 541 388 shows a fuel injection control unit with the feature of an acceleration enrichment, in which the injection start angle can be advanced, among other things, depending on the speed according to a specified formula (column 4, lines 62 to column 5, line 30).

Es hat sich nun gezeigt, dass die bekannten Kraftstoffzumesssysteme nicht alle Erfordernisse einer Brennkraftmaschinensteuerung optimal abzudecken vermögen.It has now been shown that the known fuel metering systems are unable to optimally cover all the requirements of an internal combustion engine control system.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemässe Verfahren zur Kraftstoffzuteilung während Beschleunigungsvorgängen mit den kennzeichnenden Merkmalen des Hauptanspruchs hat gegenüber dem bekannten Verfahren den Vorteil, dass eine unmittelbare und schnelle Zuteilung der dem Beschleunigungszustand entsprechenden Kraftstoffmenge erfolgt und damit auch eine Verbesserung der Kraftstoffaufbereitung ermöglicht wird. Mit dem Erkennen des Beschleunigungszustandes und der neu Errechnung bzw. Neufeststellung der Kraftstoffmenge wird die Differenzmenge zu der im vorangegangenen Arbeitstakt ermittelten Kraftstoffmenge bestimmt. Diese Mehrmenge wird den Zylindern zugeteilt, deren reguläre Kraftstoffeinspritzung begonnen wurde und deren Ansaugtakt jedoch noch nicht abgeschlossen wurde. Dies erfolgt zum einen in Form von zusätzlichen Kraftstoffeinspritzungen bei Zylindern, deren Kraftstoffzuteilung abgeschlossen ist oder durch Verlängern laufender Kraftstoffeinspritzungen um die errechnete Mehrmenge. Ferner werden die Einspritzventile für alle Kraftstoffeinspritzungen, deren Beginn sich durch die neue berechnete Kraftstoffmenge in die Vergangenheit verschoben hat, sofort geöffnet Während des Beschleunigungsvorgangs wird also besonderer Wert auf eine schnelle Zuteilung der erhöhten Kraftstoffmenge gelegt. Dies erfolgt vorrangig die durch den Vorlagerungswinkel vorgegebenen Beendigung einer Kraftstoffeinspritzung. Die sequentiellen Einspritzungen der eingestellten Menge des Kraftstoffs erfolgen in einer vorbestimmten Folge zu einem vom Betriebspunkt der Brennkraftmaschine abhängigen Zeitpunkts innerhalb des durch das Triggersignal vorgegebenen Arbeitstaktes. Dabei werden die Kraftstoffeinspritzungen, deren Beginn vor Erkennen des Beschleunigungszustandes noch in der Zukunft lag, früher als für einen stationären Betriebszustand vorgesehen oder auch sofort begonnen, um die Beendigung des Einspritzvorganges noch vor dem Schliessen des Einlassventils zu gewährleisten.The method according to the invention for allocating fuel during acceleration processes with the characterizing features of the main claim has the advantage over the known method that an immediate and rapid allocation of the amount of fuel corresponding to the state of acceleration takes place and thus also enables an improvement in fuel processing. With the recognition of the acceleration state and the new calculation or new determination of the fuel quantity, the difference quantity to the fuel quantity determined in the previous work cycle is determined. This excess is allocated to the cylinders whose regular fuel injection has started and whose intake stroke has not yet been completed. This takes place on the one hand in the form of additional fuel injections for cylinders whose fuel allocation has been completed or by extending current fuel injections by the calculated additional quantity. Furthermore, the injection valves for all fuel injections, the start of which has been shifted into the past due to the new calculated fuel quantity, are immediately opened. During the acceleration process, particular importance is attached to a rapid allocation of the increased fuel quantity. This takes place primarily the termination of a fuel injection predetermined by the advance angle. The sequential injections of the set amount of fuel take place in a predetermined sequence at a time dependent on the operating point of the internal combustion engine within the work cycle specified by the trigger signal. The fuel injections, the beginning of which was still in the future before the acceleration state was recognized, are provided earlier than for a steady-state operating state or are started immediately in order to ensure that the injection process is ended before the inlet valve closes.

Zeichnungdrawing

Das erfindungsgemässe Verfahren ist in der Zeichnung dargestellt und wird in der nachfolgenden Beschreibung näher erläutert. Die Zeichnung zeigt ein Zeitdiagramm der Kraftstoffzuteilung nach Erkennen eines Beschleunigungszustandes.The method according to the invention is shown in the drawing and is explained in more detail in the description below. The drawing shows a time diagram of the fuel allocation after detection of an acceleration state.

Beschreibung der ErfindungDescription of the invention

In der Zeichnung wird von einer Brennkraftmaschine mit vier Zylindern ausgegangen, wobei in der obersten Linie die Triggersignale TS dargestellt sind. Dieses Triggersignal TS ist um einen applikationsspezifischen Winkel gegenüber den oberen Totpunkten der einzelnen Zylinder nach früh verschoben. Die Zeitdauer TK entspricht einer Kurbelwellendrehung von 180°. Für jeden der Zylinder 1 bis 4 sind die Öffnungszeiten der Einlassventile V1 bis V4 dargestellt. Der Betriebszustand der Brennkraftmaschine wird synchron zum Triggersignal TS erfasst. Die Definition des Beschleunigungszustandes wird anhand des aktuellen Betriebszustandes und den Daten vorangegangener Betriebszustände vorgenommen, wobei insbesondere die.Last, Laständerungen, Drehzahl usw. erfasst werden. Ist in der hier nicht weiter zu erläuternden Weise der Beschleunigungszustand definiert und festgestellt, so wird während des Beschleunigungszustandes der Brennkraftmaschine die Kraftstoffzuteilung um eine dem jeweiligen Beschleunigungszustand angemessene Mehrmenge erhöht. Erfindungsgemäss erfolgt die Zuteilung für all die Zylinder, deren reguläre Kraftstoffzuteilung begonnen wurde und deren Ansaugvorgang noch nicht beendet wurde, d. h., das Einlassventil ist noch nicht geschlossen. Nachfolgend sei davon ausgegangen, dass zur Zeit t der Beschleunigungszustand erkannt ist.In the drawing, an internal combustion engine with four cylinders is assumed, the trigger signals TS being shown in the top line. This trigger signal TS is shifted early by an application-specific angle with respect to the top dead centers of the individual cylinders. The time period TK corresponds to a crankshaft rotation of 180 °. The opening times of the intake valves V1 to V4 are shown for each of the cylinders 1 to 4. The operating state of the internal combustion engine is recorded synchronously with the trigger signal TS. The definition of the acceleration state is based on the ak current operating state and the data of previous operating states, in particular the load, load changes, speed, etc. are recorded. If the acceleration state is defined and determined in the manner not to be explained further here, the fuel allocation is increased by an additional amount appropriate to the respective acceleration state during the acceleration state of the internal combustion engine. According to the invention, the allocation takes place for all the cylinders whose regular fuel allocation has started and whose intake process has not yet ended, ie the inlet valve is not yet closed. It is assumed below that the acceleration state is recognized at time t.

Nach diesem Zeitpunkt t wird gerade das Einlassventil V2 vom Zylinder 2 geöffnet. Aufgrund des erkannten Beschleunigungszustandes erfolgt sofort eine zusätzliche Kraftstoffeinspritzung, Zwischenspritzer genannt, in den Zylinder 2, wie es durch das Signal a dargestellt ist. Im nächsten Arbeitsspiel erfolgt dann in den gleichen Zylinder wieder die termingerechte, an die neue Last angepasste, Kraftstoffeinspritzung, die durch das Si gnal d dargestellt ist. Im Rahmen dieser Erfindung erfolgt der Beginn der termingerechten sequentiellen Kraftstoffeinspritzung entsprechend der Kraftstoffmenge, der Batteriespannung, des Vorlagerungswinkels sowie der Drehzahl. Der Vorlagerungswinkel bestimmt dabei die Lage des Endes der sequentiellen Einspritzung bezüglich dem Offnen des zugehörigen Einlassventils. Nach jedem Triggersignal wird innerhalb des nachfolgenden Arbeitstaktes die auszulösende Kraftstoffeinspritzung initiiert.After this time t, the inlet valve V2 is just opened by the cylinder 2. On the basis of the recognized acceleration state, an additional fuel injection, called an intermediate spray, takes place immediately into the cylinder 2, as represented by the signal a. In the next work cycle, the on-time fuel injection, which is represented by the signal d, takes place again in the same cylinder, adapted to the new load. In the context of this invention, the on-schedule sequential fuel injection takes place in accordance with the fuel quantity, the battery voltage, the advance angle and the speed. The advance angle determines the position of the end of the sequential injection with respect to the opening of the associated intake valve. After each trigger signal, the fuel injection to be triggered is initiated within the subsequent work cycle.

Im Zylinder 3 wäre an sich kurz nach der Zeit t die Kraftstoffeinspritzung zu Ende. Aufgrund des erkannten Beschleunigungszustandes wird jedoch die noch laufende Kraftstoffeinspritzung in den Zylinder 3 verlängert, wie es durch das Signal b dargestellt ist. Aufgrund dieser erfindungsgemässen Verlängerung der Kraftstoffeinspritzung steht daher unverzüglich eine erhöhte Kraftstoffmenge zur Verfügung.In cylinder 3, fuel injection would end shortly after time t. Due to the detected acceleration state, however, the fuel injection still running in the cylinder 3 is extended, as represented by the signal b. Because of this extension of the fuel injection according to the invention, an increased amount of fuel is therefore immediately available.

Schliesslich wird in dem Zylinder 4 sofort mit der nächsten Kraftstoffeinspritzung begonnen, die durch das Signal c angedeutet ist. Für diesen Zylinder4 hätte die Einspritzung normalerweise, also ohne dass der Beschleunigungszustand erkannt worden wäre und ohne Wirksamwerden des erfindungsgemässen Verfahrens, erst zu einem späteren Zeitpunkt begonnen. Durch den dargestellten sofortigen Beginn der Kraftstoffeinspritzung erfolgt erfindungsgemäss eine schnelle Zuteilung der dem Beschleunigungszustand entsprechenden Kraftstoffmenge.Finally, the next fuel injection, which is indicated by the signal c, is started immediately in the cylinder 4. For this cylinder 4, the injection would normally only have started at a later point in time, ie without the acceleration state having been recognized and without the method according to the invention becoming effective. Due to the illustrated immediate start of fuel injection, the amount of fuel corresponding to the acceleration state is allocated quickly according to the invention.

Wesentlich dabei ist, dass die neu berechnete Kraftstoffmenge zum Zeitpunkt t für alte Kraftstoffeinspritzungen massgebend ist, deren Einspritzbeginn an bzw. nach diesem Triggersigna! TS initiiert werden muss und für alle Zylinder, bei denen die termingerechte Einspritzung bereits abgeschlossen, deren Einlassventil aber noch offen ist.It is essential that the newly calculated fuel quantity at time t is decisive for old fuel injections, the start of injection at or after this trigger signal! TS must be initiated and for all cylinders for which the timely injection has already been completed but whose intake valve is still open.

Claims (2)

1. Process forfuel metering during acceleration procedures into a plurality of cylinders of an internal combustion engine with sequential injection, in which the fuel quantity to be injected is calculated in accordance with the operating state and the acceleration state is determined, the acceleration state having been determined an additional quantity of fuel is injected into a cylinder whose inlet valve is not yet closed and matched to the desired acceleration, characterised in that the fuel injections already proceeding at the time of the execution of the additional fuel injections are prolonged in accordance with the additional quantity (b) calculated and in that those fuel injections, the start of which was still in the future prior to the detection of the acceleration state, are begun earlier in comparison to the conditions in the case of steady-state operation or immediately if their recalculated beginning of injection precedes the detection of the acceleration state.
2. Process according to Claim 1, characterised in that the fuel injections are effected at a time dependent on the operating state of the internal combustion engine as a function of a power cycle determined by the trigger signal (TS).
EP87903861A 1986-07-09 1987-06-23 Fuel metering process Expired - Lifetime EP0272290B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863623041 DE3623041A1 (en) 1986-07-09 1986-07-09 METHOD FOR FUEL ALLOCATION
DE3623041 1986-07-09

Publications (3)

Publication Number Publication Date
EP0272290A1 EP0272290A1 (en) 1988-06-29
EP0272290B1 EP0272290B1 (en) 1990-01-31
EP0272290B2 true EP0272290B2 (en) 1993-01-27

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EP87903861A Expired - Lifetime EP0272290B2 (en) 1986-07-09 1987-06-23 Fuel metering process

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US (1) US4893602A (en)
EP (1) EP0272290B2 (en)
JP (1) JP2711543B2 (en)
KR (1) KR970007390B1 (en)
DE (2) DE3623041A1 (en)
WO (1) WO1988000285A1 (en)

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Publication number Publication date
EP0272290B1 (en) 1990-01-31
WO1988000285A1 (en) 1988-01-14
KR970007390B1 (en) 1997-05-08
DE3623041A1 (en) 1988-01-14
JPH01500209A (en) 1989-01-26
EP0272290A1 (en) 1988-06-29
JP2711543B2 (en) 1998-02-10
DE3761579D1 (en) 1990-03-08
US4893602A (en) 1990-01-16
KR880701819A (en) 1988-11-05

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