EP0314680A1 - Fuel injection process. - Google Patents

Fuel injection process.

Info

Publication number
EP0314680A1
EP0314680A1 EP87903859A EP87903859A EP0314680A1 EP 0314680 A1 EP0314680 A1 EP 0314680A1 EP 87903859 A EP87903859 A EP 87903859A EP 87903859 A EP87903859 A EP 87903859A EP 0314680 A1 EP0314680 A1 EP 0314680A1
Authority
EP
European Patent Office
Prior art keywords
synchronization
signals
fuel injection
opening
phase
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
EP87903859A
Other languages
German (de)
French (fr)
Other versions
EP0314680B1 (en
Inventor
Wolfgang Hoptner
Egbert Perenthaler
Helmut Schwarz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0314680A1 publication Critical patent/EP0314680A1/en
Application granted granted Critical
Publication of EP0314680B1 publication Critical patent/EP0314680B1/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
    • F02D41/32—Controlling fuel injection of the low pressure type
    • F02D41/36—Controlling fuel injection of the low pressure type with means for controlling distribution
    • F02D41/365—Controlling fuel injection of the low pressure type with means for controlling distribution with means for controlling timing and distribution
    • 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
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting

Definitions

  • the invention relates to a method for fuel injection according to the preamble of the main claim.
  • the method for fuel injection according to the invention with the characterizing features of the main claim gives the advantage of quickly switching to sequential fuel injection.
  • the fuel allocation takes place once per ignition over all one injection valves at the same time during a first phase, and is delayed by a time t1 to the reference signal and in a predefinable opening interval T1.
  • the opening interval T1 is smaller than after the synchronization and depends in particular on the engine temperature, the speed and the number of cylinders. The result is an improved cold start behavior with minimization of fuel injection into open intake valves.
  • FIG. 1 shows a time diagram with the signals for opening the injection valves of an internal combustion engine with six cylinders, the successive fuel injection taking place after the reference signal of the first cylinder has been recognized
  • FIG. 2 shows a time diagram similar to FIG. 1, but in addition the synchronization also takes place after the fourth cylinder has been recognized.
  • FIG. 1 shows the time diagram of the signals for opening the one-injection valves E1 to E6 of an internal combustion engine with six cylinders.
  • the top line shows the reference marks or reference signals of the respective cylinders 1 to 6. It is known when starting the internal combustion engine or after If the synchronization between the internal combustion engine and the control unit, by means of which the fuel injection is carried out, a phase-correct fuel allocation is not possible. For example, assume that the reference signal B2 for the second cylinder occurs after starting the internal combustion engine. Here, as shown in the bottom line, the first ignition takes place. In a first phase a, an opening signal is now given once per ignition for all injection valves, and thus the fuel is allocated to all cylinders.
  • the opening signals are delayed by a time t1 with respect to the reference signals B2 to Bö, which are synchronous to the crankshaft.
  • the delay time t1 depends in particular on the engine temperature and the speed.
  • the time period T1 of the opening signals is significantly shorter than the opening time T2 after synchronization has taken place.
  • the opening time T1 is particularly dependent on the engine temperature, the speed and the number of cylinders. There is a minimization of the fuel injection in the open intake cylinder, whereby a good cold start behavior is achieved.
  • the synchronization is recognized with the reference signal B1 for the first cylinder.
  • the fuel injection is now gradually switched to sequential operation. During this phase of the changeover, fuel will continue to be allocated to the remaining cylinders in parallel until the first time their intake valves are closed.
  • the sequential force Substance fine injections are delayed by the delay time t2 in relation to the associated reference signals B1 to B6.
  • This delay time t2 and the opening time T2 depend in the usual way on the parameters to be taken into account for the fuel injection, in particular the engine speed, the load, the engine temperature, lambda and the acceleration.
  • the sequential fuel injection takes place exclusively.
  • the injections framed by dashed lines are made according to the invention in addition to the injections or openings of the valves after the first reference signal B2.
  • FIG. 2 shows a special embodiment in which the synchronization takes place not only by recognizing the first cylinder, but also by recognizing the fourth cylinder.
  • the synchronization thus begins considerably earlier, in this embodiment after the third ignition. Due to the rapid switching to sequential fuel injection, there is a further minimization of fuel injection into open intake valves.

Landscapes

  • 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

Procédé d'injection de carburant dans un moteur à combustion interne multi-cylindres. En fonction de signaux de référence synchrones avec le vilebrequin, des signaux d'ouverture sont produits pour les soupapes injectrices respectives de chaque cylindre, toutes les soupapes injectrices étant d'abord actionnées ensemble après mise sous tension de l'allumage et les signaux d'ouverture en vue de l'injection séquentielle de carburant étant produits après la reconnaissance de la synchronisation. Le problème à résoudre est de pouvoir, après lancement du moteur ou après mauvais fonctionnement de la synchronisation, passer rapidement à l'injection séquentielle de carburant, la quantité de carburant injectée dans les soupapes d'admission ouvertes devant être réduite au minimum. On propose à cet effet que dans une phase (a) jusqu'à la reconnaissance de la synchronisation, au moins en cas de nouvel allumage, les signaux soient amenés, notamment simultanément, aux soupapes injectrices. De plus, dans une phase (b) suivant la reconnaissance de la synchronisation, les signaux d'ouverture sont amenés simultanément aux soupapes injectrices pour les cylindres n'étant pas encore passés au mode de fonctionnement séquentiel.Method of injecting fuel into a multi-cylinder internal combustion engine. According to reference signals synchronous with the crankshaft, opening signals are produced for the respective injector valves of each cylinder, all the injector valves being first actuated together after switching on the ignition and the signals of opening for sequential fuel injection being produced after recognition of synchronization. The problem to be solved is to be able, after starting the engine or after malfunctioning of the synchronization, to quickly switch to sequential fuel injection, the quantity of fuel injected into the open intake valves having to be reduced to the minimum. It is proposed for this purpose that in a phase (a) until recognition of the synchronization, at least in the event of a new ignition, the signals are brought, in particular simultaneously, to the injector valves. In addition, in a phase (b) following recognition of the synchronization, the opening signals are brought simultaneously to the injector valves for the cylinders which have not yet switched to the sequential operating mode.

Description

Verfahren zur Kraftstoffeinspritzung Fuel injection method
Stand der TechnikState of the art
Die Erfindung betrifft ein Verfahren zur Kraftstoffeinspritzung nach der Gattung des Hauptanspruchs.The invention relates to a method for fuel injection according to the preamble of the main claim.
Aus der DE-OS 32 43 456 ist ein elektronisches Kraftstoffeinspritz-Steuersystem bekannt, bei welchem unmittelbar nach dem Schließen eines Zündschalters einmal alle Kraftstoffeinspritzventile gleichzeitig geöffnet werden, um Kraftstoff zu allen Zylindern des Verbrennungsmotors zu führen. Danach bleiben jedoch sämtliche KraftStoffeinspritzvent ile solange geschlossen, bis die Kolben der Zylinder einen Saughub ausgeführt haben und die Synchronisation erkannt ist. Nach Erkennung der Synchronisation werden in Abhängigkeit der mit der Kurbelwelle synchronen Bezugs Signale die Kraftstoffeinspritzventile sukzessive in vorgegebener Sequenz geöffnet und Kraftstoff in den jeweiligen Zylinder eingespritzt. Die Öffnungszeit beim gemeinsamen anfänglichen öffnen sämtlicher Einspritzvent ile entspricht der Öffnungszeit nach dem Erkennen der Synchronisation. In geöffnete Einlaßventile wird eine relativ große Kraftstoffmenge eingespritzt. Bis zum Einsetzen der sequentiellen Kraftstoffeinspritzungen nach der Synchronisation gelangt in die jeweiligen Verbrennungsräume kein weiterer Kraftstoff.From DE-OS 32 43 456 an electronic fuel injection control system is known, in which immediately after the closing of an ignition switch all fuel injection valves are opened at the same time in order to lead fuel to all cylinders of the internal combustion engine. After that, however, all fuel injection valves remain closed until the pistons of the cylinders have performed a suction stroke and the synchronization is recognized. After detection As a function of the reference signals synchronized with the crankshaft, the fuel injectors are opened successively in a predetermined sequence and fuel is injected into the respective cylinder. The opening time when all the injection valves are initially opened corresponds to the opening time after the synchronization has been recognized. A relatively large amount of fuel is injected into opened intake valves. No further fuel gets into the respective combustion chambers until the sequential fuel injections have started after the synchronization.
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemäße Verfahren zur Kraftstoffeinspritzung mit den kennzeichnenden Merkmalen des Haupt ans pruchs ergibt den Vorteil des schnellen Umschaltens auf sequentielle Kraftstoffeinspritzung. Nach dem Starten bzw. nach einer Störung der Synchronisation erfolgt während einer ersten Phase einmal pro Zündung über alle Eins pritzvent ile gleichzeitig die Kraf tstoff Zuteilung, und zwar um eine Zeit t1 verzögert zum Bezugssignal und in einem vorgeb baren Öffnungsintervall T1. Das öffnungsintervall T1 ist erfindungsgemäß kleiner als nach der Synchronisation und hängt insbesondere von der Motortemperatur, der Drehzahl und der Anzahl der Zylinder ab. Es ergibt sich ein verbessertes Kaltstartverhalten bei Minimalisierung der Kraftstoffeinspritzung in geöffnete Einlaßventile. Nach dem Erkennen der Synchronisation erfolgt sukzessive die Umstellung der Eins spritzung auf den sequentiellen Betrieb, wobei den restlichen, noch nicht synchronisierten Zylindern bis zum Zeitpunkt des ersten Schließens ihre Einlaßventile weiterhin im Parallel betrieb Kraftstoff zugeteilt wird. Im Verbrennungsraum ist folglich immer ein Kraftstoff-Luftgemisch vorhanden.The method for fuel injection according to the invention with the characterizing features of the main claim gives the advantage of quickly switching to sequential fuel injection. After starting or after a fault in the synchronization, the fuel allocation takes place once per ignition over all one injection valves at the same time during a first phase, and is delayed by a time t1 to the reference signal and in a predefinable opening interval T1. According to the invention, the opening interval T1 is smaller than after the synchronization and depends in particular on the engine temperature, the speed and the number of cylinders. The result is an improved cold start behavior with minimization of fuel injection into open intake valves. After the synchronization has been recognized, the changeover to the one injection takes place successively to the sequential operation, the remaining, not yet synchronized cylinders until the time of their first closing their intake valves continue to be allocated in parallel operation fuel. A fuel-air mixture is therefore always present in the combustion chamber.
Zeichnungdrawing
Anhand der Zeichnung wird das erfindungsgemäße Verfahren in Verbindung mit der nachfolgenden Beschreibung näher erläutert. Es zeigt:The method according to the invention is explained in more detail with reference to the drawing in conjunction with the following description. It shows:
Figur 1 ein Zeitdiagramm mit den Signalen zum öffnen der Einspritzventile einer Brennkraftmaschine mit sechs Zylindern, wobei nach dem Erkennen des Bezugs Signals des ersten Zylinders die sukzessive Kraftstoffeinspritzung erfolgt,1 shows a time diagram with the signals for opening the injection valves of an internal combustion engine with six cylinders, the successive fuel injection taking place after the reference signal of the first cylinder has been recognized,
Figur 2 ein Zeitdiagramm ähnlich Figur - 1, wobei jedoch zusätzlich die Synchronisation auch nach dem Erkennen des vierten Zylinders erfolgt.FIG. 2 shows a time diagram similar to FIG. 1, but in addition the synchronization also takes place after the fourth cylinder has been recognized.
Beschreibung der ErfindungDescription of the invention
Figur 1 zeigt das Zeitdiagramm der Signale zum öffnen der Eins pritzvent ile El bis E6 einer Brennkraftmaschine mit sechs Zylindern. In der obersten Linie sind die Bezugsmarken oder Bezugssignale der jeweiligen Zylinder 1 bis 6 angegeben. Bekanntlich ist beim Starten der Brennkraftmaschine bzw. nach einer Störung der Synchronisation zwischen Brennkraftmaschine und der Steuereinheit, mittels welcher die Kraftstoffeinspritzung vorgenommen wird, eine phasengerechte Kraftstoffzuteilung nicht möglich. So sei beispielshaft davon ausgegangen, daß nach dem Starten der Brennkraftmaschine zunächst das Bezugs Signal B2 für den zweiten Zylinder auftritt. Hierbei erfolgt wie in der untersten Linie dargestellt ist, die erste Zündung. In einer ersten Phase a erfolgt nunmehr pro Zündung einmal für alle Einspritzventile jeweils gleichzeitig ein öffnungs Signal und somit die Kraftstoffzuteilung in sämtliche Zylinder. Die öffnungs Signale sind zu den Bezugs Signalen B2 bis Bö, die synchron zur Kurbelwelle sind, um eine Zeit t1 verzögert. Die Verzögerungszeit t1 hängt insbesondere von der Motortemperatur und der Drehzahl ab. Die Zeitdauer T1 der öffnungs Signale ist im Rahmen dieser Erfindung wesentlich kleiner als die Öffnungszeit T2 nach erfolgter Synchronisation. Die Öffnungszeit T1 ist insbesondere abhängig von der Motortemperatur, der Drehzahl sowie der Anzahl der Zylinder. Es wird eine Minimalis ierung der Kraftstoffeinspritzung in geöffnete Einlaßzylinder erreicht, wodurch ein gutes Kaltstartverhalten erzielt wird.FIG. 1 shows the time diagram of the signals for opening the one-injection valves E1 to E6 of an internal combustion engine with six cylinders. The top line shows the reference marks or reference signals of the respective cylinders 1 to 6. It is known when starting the internal combustion engine or after If the synchronization between the internal combustion engine and the control unit, by means of which the fuel injection is carried out, a phase-correct fuel allocation is not possible. For example, assume that the reference signal B2 for the second cylinder occurs after starting the internal combustion engine. Here, as shown in the bottom line, the first ignition takes place. In a first phase a, an opening signal is now given once per ignition for all injection valves, and thus the fuel is allocated to all cylinders. The opening signals are delayed by a time t1 with respect to the reference signals B2 to Bö, which are synchronous to the crankshaft. The delay time t1 depends in particular on the engine temperature and the speed. In the context of this invention, the time period T1 of the opening signals is significantly shorter than the opening time T2 after synchronization has taken place. The opening time T1 is particularly dependent on the engine temperature, the speed and the number of cylinders. There is a minimization of the fuel injection in the open intake cylinder, whereby a good cold start behavior is achieved.
Mit dem Bezugs Signal B1 für den ersten Zylinder wird die Synchronisation erkannt. Es erfolgt nunmehr sukzessiv die Umstellung der Kraftstoffeinspritzung auf sequentiellen Betrieb. Während dieser Phase der Umstellung wird bis zum Zeitpunkt des ersten Schließens ihrer Einlaßventile den restlichen Zylindern weiterhin im Parallelbetrieb Kraftstoff zugeteilt. Die sequentiellen Kraft stof feinspritzungen erfolgen bezogen auf die zugehörigen Bezugssignale B1 bis B6 jeweils um die Verzögerungszeit t2 verzögert. Diese Verzögerungszeit t2 und die Öffnungszeit T2 hängen in üblicher Weise von den für die Kraftstoffeinspritzung zu beachtenden Parametern, und zwar vor allem der Motordrehzahl, der Last, der Motortemperatur, Lamda sowie der Beschleunigung ab. In der nachfolgenden Phase c erfolgt dann ausschließlich die sequentielle Kraftstoffeinspritzung. Die durch gestrichelte Linien eingerahmten Einspritzungen werden erfindungs gemäß zusätzlich zu den Einspritzungen bzw. Öffnungen der Ventile nach dem ersten Bezugs Signal B2 vorgenommen.The synchronization is recognized with the reference signal B1 for the first cylinder. The fuel injection is now gradually switched to sequential operation. During this phase of the changeover, fuel will continue to be allocated to the remaining cylinders in parallel until the first time their intake valves are closed. The sequential force Substance fine injections are delayed by the delay time t2 in relation to the associated reference signals B1 to B6. This delay time t2 and the opening time T2 depend in the usual way on the parameters to be taken into account for the fuel injection, in particular the engine speed, the load, the engine temperature, lambda and the acceleration. In the subsequent phase c, the sequential fuel injection takes place exclusively. The injections framed by dashed lines are made according to the invention in addition to the injections or openings of the valves after the first reference signal B2.
Figur 2 zeigt eine besondere Ausgestaltung, bei welcher die Synchronisation nicht nur durch Erkennen des ersten Zylinders, sondern zusätzlich durch Erkennen des vierten Zylinders erfolgt. Allgemein wird bei dieser Ausgestaltung der Zylinder 1 oder der Zylinder M = N/2 + 1 zur Erkennung herangezogen, wobei N die Gesamtzahl der Zylinder ist. Die Synchronisation setzt somit erheblich früher ein, und zwar bei diesem Ausführungsbeispiel nach der dritten Zündung. Aufgrund des schnellen Umschaltens auf die sequentielle Kraftstoffeinspritzung ergibt sich eine weitere Minimalis ierung der Kraftstoffeinspritzung in geöffnete Einlaßventile. FIG. 2 shows a special embodiment in which the synchronization takes place not only by recognizing the first cylinder, but also by recognizing the fourth cylinder. In general, in this embodiment, cylinder 1 or cylinder M = N / 2 + 1 is used for recognition, where N is the total number of cylinders. The synchronization thus begins considerably earlier, in this embodiment after the third ignition. Due to the rapid switching to sequential fuel injection, there is a further minimization of fuel injection into open intake valves.

Claims

Ansprüche Expectations
1. Verfahren zur Kraftstoffeinspritzung in einen mehrzylindrigen Verbrennungsmotor, gemäß welchem in Abhängigkeit von mit der Kurbelwelle synchronen BezugsSignalen öffnungssignale für die jeweiligen Einspritzventile der einzelnen Zylinder erzeugt werden, wobei nach dem Einschalten der Zündung zunächst alle Einspritzventile gemeinsam einmal geöffnet werden und nach dem Erkennen der Synchronisation die öffnungssignale zur sequentiellen Kraftstoffeinspritzung erzeugt werden, dadurch gekennzeichnet, daß beim Starten oder nach einer Störung der Synchronisation in einer Phase (a) bis zum Erkennen der Synchronisation wenigstens bei einer weiteren Zündung den Einspritzventilen, insbesondere allen gleichzeitig, zusätzliche öffnungssignale zugeführt werden und/oder daß in einer Phase (D) nach Erkennen der Synchronisation für die noch nicht auf sequentiellen Betrieb umgestellten Zylinder weitere öffnungssignale den Einspritzventilen zugeführt werden. 1. Method for fuel injection into a multi-cylinder internal combustion engine, according to which opening signals for the respective injection valves of the individual cylinders are generated as a function of reference signals that are synchronous with the crankshaft, with all the injection valves being opened together once after switching on the ignition and after detection of the synchronization the opening signals for sequential fuel injection are generated, characterized in that, when starting or after a fault in the synchronization in one phase (a) until the synchronization is recognized, the injection valves, in particular all at the same time, are supplied with additional opening signals and / or that in a phase (D) after recognition of the synchronization for the cylinders not yet switched to sequential operation, further opening signals are fed to the injection valves.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß in der Phase (a) und/oder in der Phase (b) die zusätzlichen öffnungs Signale bei jeder Zündung den betreffenden Einspritzventilen zugeführt werden.2. The method according to claim 1, characterized in that in phase (a) and / or in phase (b) the additional opening signals are supplied to the relevant injection valves with each ignition.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Zeitdauer (T1) der öffnungs Signale während der Phasen (a) und/oder (b) wesentlich kleiner sind als die öffnungs zelten (T2) nach erfolgter Synchronisation.3. The method according to claim 1 or 2, characterized in that the time period (T1) of the opening signals during phases (a) and / or (b) are substantially smaller than the opening tents (T2) after synchronization.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Erkennung der Synchronisation bei wenigstens einem weiteren Zylinder erfolgt, insbesondere bei dem Zylinder M = N/2 + 1, wobei N die Gee samtzahl der Zylinder bedeutet. 4. The method according to any one of claims 1 to 3, characterized in that the detection of the synchronization takes place in at least one further cylinder, in particular in the cylinder M = N / 2 + 1, where N is the total number of cylinders.
EP87903859A 1986-07-09 1987-06-23 Fuel injection process Expired - Lifetime EP0314680B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3623042 1986-07-09
DE19863623042 DE3623042A1 (en) 1986-07-09 1986-07-09 FUEL INJECTION METHOD

Publications (2)

Publication Number Publication Date
EP0314680A1 true EP0314680A1 (en) 1989-05-10
EP0314680B1 EP0314680B1 (en) 1990-08-22

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Family Applications (1)

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EP87903859A Expired - Lifetime EP0314680B1 (en) 1986-07-09 1987-06-23 Fuel injection process

Country Status (5)

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US (1) US4941449A (en)
EP (1) EP0314680B1 (en)
JP (1) JPH01503248A (en)
DE (2) DE3623042A1 (en)
WO (1) WO1988000287A1 (en)

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Also Published As

Publication number Publication date
DE3764473D1 (en) 1990-09-27
DE3623042A1 (en) 1988-01-14
WO1988000287A1 (en) 1988-01-14
US4941449A (en) 1990-07-17
JPH01503248A (en) 1989-11-02
EP0314680B1 (en) 1990-08-22

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