EP1122418A2 - Method for adaptation of maximum injection pressure in high pressure accumulator - Google Patents

Method for adaptation of maximum injection pressure in high pressure accumulator Download PDF

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Publication number
EP1122418A2
EP1122418A2 EP01100564A EP01100564A EP1122418A2 EP 1122418 A2 EP1122418 A2 EP 1122418A2 EP 01100564 A EP01100564 A EP 01100564A EP 01100564 A EP01100564 A EP 01100564A EP 1122418 A2 EP1122418 A2 EP 1122418A2
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EP
European Patent Office
Prior art keywords
pressure
injection
injection pressure
injectors
pressure accumulator
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Granted
Application number
EP01100564A
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German (de)
French (fr)
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EP1122418B1 (en
EP1122418A3 (en
Inventor
Thomas Frenz
Peter Klee
Hansjoerg Bochum
Winfried Langer
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1122418A3 publication Critical patent/EP1122418A3/en
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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
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • 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
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D41/1406—Introducing closed-loop corrections characterised by the control or regulation method with use of a optimisation method, e.g. iteration
    • 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
    • F02D41/3809—Common rail control systems
    • F02D41/3827—Common rail control systems for diesel engines
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D2041/224—Diagnosis of the fuel system
    • 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
    • F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/31—Control of the fuel pressure

Definitions

  • the present invention relates to a method for Adaptation of one in a high pressure accumulator
  • a direct injection fuel metering system Internal combustion engine prevailing maximum injection pressure, several of the high-pressure accumulators Controllable injectors depending on the operating size Metering fuel from the high pressure accumulator in Branch off the combustion chambers of the internal combustion engine.
  • the fuel metering system is, for example, as a common rail gasoline direct injection system with a pre-feed pump and a demand-driven or demand-controlled one High pressure pump trained.
  • the present invention can but also with direct-injection diesel engines be used.
  • the pre-feed pump is designed, for example, as an electric fuel pump and feeds fuel from a fuel reservoir into a low pressure area of the fuel metering system. By doing Low pressure range is a pre-pressure of 4 bar, for example.
  • the high pressure pump delivers the fuel from the Low pressure area in the high pressure accumulator in one High pressure area of the fuel metering system. By doing High pressure accumulator is dependent on the operating state of the Internal combustion engine a pressure between about 50 and 120 bar regulated.
  • the branches of the high pressure accumulator depending on the operating size controllable injectors with appropriate control, the fuel from the High-pressure accumulator with the injection pressure there inject into the combustion chambers of the internal combustion engine.
  • the high pressure injectors of a fuel metering system open a direct-injection gasoline engine after activation by magnetic force.
  • the magnetic force is generated by an electromagnet that is part of the Injector is. Is not activated the injector closed; a sealing element of the Injector is placed on a spring element Valve seat pressed.
  • a sealing element of the Injector is placed on a spring element Valve seat pressed.
  • the spring force of the Spring element and the hydraulic force in the High pressure accumulator prevailing injection pressure overcome become.
  • the electromagnet is in practice with voltages operated that are significantly higher than that The battery voltage of the vehicle battery is (so-called booster mode).
  • Solving injectors can be the maximum Injection pressure to which is regulated in the High pressure accumulator can be reduced so far that under Taking into account all manufacturing tolerances and the Wear of the injectors with all injectors Open security and throughout the given Keep injection duration open. With such a set injection pressure can save the resources of a However, the fuel metering system has not been optimally used become.
  • the initial pressure at which the injection pressure in the High-pressure accumulator at the beginning of the invention is set, for example Injection pressure, which according to the prior art in the High pressure accumulator is set.
  • the initial pressure can selected the same size for internal combustion engines of the same type become.
  • Initial pressure is an optimal use of resources of the fuel metering system is not possible.
  • the injection pressure becomes in the high pressure accumulator in the operating points where the maximum injection pressure is required increased.
  • the pressure is preferably increased continuously. At the same time it is checked whether the injection valves open. As long as open all injectors, the injection pressure further increased.
  • the injection pressure no longer increases elevated. Based on the achieved at that time Injection pressure then becomes one predetermined amount decreased.
  • the default amount is chosen so that at the reduced injection pressure all Open injectors. It is also conceivable that the Injection pressure based on the injection pressure reached is slowly reduced until all the injectors again to open. In this case, the predetermined amount would be variable. The reduced injection pressure will eventually as the maximum injection pressure of the high-pressure accumulator used.
  • maximum injection pressure in the high pressure accumulator on the one hand be chosen so low that all injectors are still open the fuel metering system with certainty.
  • the injection pressure is chosen so high that optimal use of the resources of the Fuel metering system is guaranteed.
  • the maximum Injection pressure of the high pressure accumulator for each one Customized fuel metering system is guaranteed. This allows also manufacturing tolerances and wear of the Injectors in every fuel metering system be considered individually. So for everyone single internal combustion engine smooth running Internal combustion engine and a consistently good one Emission behavior while using the full Resources of the fuel metering system are guaranteed.
  • the initial pressure be set in this way will that considering all Manufacturing tolerances and wear of the Injectors all injectors with certainty to open. Should the implementation of the the method according to the invention nevertheless terminate the case, that at least one of the injectors in the Initial pressure does not open, so this injector, the fuel metering system or the whole Internal combustion engine classified as faulty and repaired or replaced.
  • a message be output if the maximum injection pressure of the High pressure storage below a predeterminable Pressure threshold.
  • a message is issued if the adapted maximum Injection pressure above the initial pressure but below a predefinable pressure threshold.
  • This message can either a control unit of an internal combustion engine Further processing can be supplied. Or the message becomes an outside person for further processing or to initiate appropriate steps.
  • the Message can be, for example, as an optical or acoustic Error message or as a display of adapt maximum injection pressure.
  • the process according to the invention is advantageously carried out according to assembly or repair, especially after Exchange of at least one fuel injector, the Fuel metering system performed.
  • One of external signal a special operating state force the internal combustion engine in which, for. B. idle maximum injection pressure is required and the adaptation once, regardless of the operating point.
  • the method be predefined time intervals, especially after a specifiable Number of driving cycles or after a specifiable one Operating time.
  • the maximum injection pressure is dependent on aging and wear Changes in the injection valves and / or changes in the pressure-controlling or pressure-regulating parts of the Fuel metering system set. The changes are made with such a large time constant that an adaptation of the maximum injection pressure in relatively large temporal Intervals, for example monthly, is completely sufficient.
  • Procedure is carried out at the end of the line.
  • the inventive method shown in Figure 1 is used to adapt one in a high pressure accumulator Fuel metering system of a direct-injection gasoline engine prevailing maximum injection pressure.
  • Several branches of the high-pressure accumulator Controllable injectors depending on the operating size for metering fuel from the high pressure accumulator in Combustion chambers of the internal combustion engine serve.
  • the method according to the invention is carried out when the internal combustion engine is in an operating state, in which the maximum injection pressure is required.
  • the process begins in function block 1.
  • a subsequent function block 2 becomes a specific one Injection pressure as the initial pressure in the high pressure accumulator certainly.
  • the initial pressure is determined such that under Taking into account all manufacturing tolerances and the Wear of the injectors with all injectors Open security.
  • a targeted requirement for example by a workshop that Initial pressure set in the high pressure accumulator.
  • the queue is exited as soon as the internal combustion engine is in an operating state in which the maximum injection pressure is required.
  • a query block 4 It is then checked in a query block 4 whether the in the injection pressure set in the high pressure accumulator all Open injectors. If all injectors open, the injection pressure is in a function block 5 increased by an increment in the high-pressure accumulator. It is then checked again in the query block 4, whether all injectors open. The injection pressure will as long as increased by one increment, or the loop consisting of the query block 4 and the function block 5 is run through until at least one of the Injector no longer opens.
  • Function block 6 branches where the injection pressure in the High pressure accumulator is reduced by one increment.
  • For Security is still in a subsequent query block 7 once checked whether all injectors again to open. If not, the function block becomes 6 branches where the injection pressure again by one Increment is decreased. The loop consisting of the Function block 6 and the query block 7 will last run until all injectors open again. Then is branched into a function block 8, where the now in injection pressure set as high pressure accumulator maximum injection pressure of the high pressure accumulator is used.
  • a final function block 9 the method according to the invention has ended. Furthermore the procedure is always ended when the Injection pressure in the high pressure accumulator due to the Operating state of the internal combustion engine the maximum Leaves print area.
  • the method according to the invention can be installed after the Internal combustion engine at the end of the line or after repair, especially after replacing at least one Injector, fuel metering system or Internal combustion engine are running. Alternatively, it can Procedures but also at predefinable time intervals especially after a predeterminable number of driving cycles or after a predefinable operating time become.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The method involves setting a defined injection pressure as an initial pressure, increasing the injection pressure starting from the initial pressure while simultaneously checking whether the injection valves open, ending the pressure increase as soon as at least one of the valves no longer opens, reducing the injection pressure by a defined extent and using the reduced pressure as the maximum injection pressure.

Description

Stand der TechnikState of the art

Die vorliegende Erfindung betrifft ein Verfahren zur Adaption eines in einem Hochdruckspeicher eines Kraftstoffzumeßsystems einer direkteinspritzenden Brennkraftmaschine herrschenden maximalen Einspritzdrucks, wobei von dem Hochdruckspeicher mehrere betriebsgrößenabhängig steuerbare Einspritzventile zum Zumessen von Kraftstoff aus dem Hochdruckspeicher in Brennräume der Brennkraftmaschine abzweigen.The present invention relates to a method for Adaptation of one in a high pressure accumulator A direct injection fuel metering system Internal combustion engine prevailing maximum injection pressure, several of the high-pressure accumulators Controllable injectors depending on the operating size Metering fuel from the high pressure accumulator in Branch off the combustion chambers of the internal combustion engine.

Das Kraftstoffzumeßsystem ist bspw. als ein Common-Rail-Benzin-Direkteinspritzungssystem mit einer Vorförderpumpe und einer bedarfsgesteuerten bzw. bedarfsgeregelten Hochdruckpumpe ausgebildet. Die vorliegende Erfindung kann jedoch auch bei direkteinspritzenden Diesel-Brennkraftmaschinen eingesetzt werden. Die Vorförderpumpe ist bspw. als eine Elektrokraftstoffpumpe ausgebildet und fördert Kraftstoff aus einem Kraftstoff-Vorratsbehälter in einen Niederdruckbereich des Kraftstoffzumeßsystems. In dem Niederdruckbereich herrscht ein Vordruck von bspw. 4 bar. Die Hochdruckpumpe fördert den Kraftstoff aus dem Niederdruckbereich in den Hochdruckspeicher in einem Hochdruckbereich des Kraftstoffzumeßsystems. In dem Hochdruckspeicher wird abhängig von dem Betriebszustand der Brennkraftmaschine ein Druck zwischen etwa 50 und 120 bar geregelt. Von dem Hochdruckspeicher zweigen die betriebsgrößenabhängig steuerbaren Einspritzventile ab, die bei entsprechender Ansteuerung den Kraftstoff aus dem Hochdruckspeicher mit dem dort anliegenden Einspritzdruck in die Brennräume der Brennkraftmaschine einspritzen.The fuel metering system is, for example, as a common rail gasoline direct injection system with a pre-feed pump and a demand-driven or demand-controlled one High pressure pump trained. The present invention can but also with direct-injection diesel engines be used. The pre-feed pump is designed, for example, as an electric fuel pump and feeds fuel from a fuel reservoir into a low pressure area of the fuel metering system. By doing Low pressure range is a pre-pressure of 4 bar, for example. The high pressure pump delivers the fuel from the Low pressure area in the high pressure accumulator in one High pressure area of the fuel metering system. By doing High pressure accumulator is dependent on the operating state of the Internal combustion engine a pressure between about 50 and 120 bar regulated. The branches of the high pressure accumulator depending on the operating size controllable injectors with appropriate control, the fuel from the High-pressure accumulator with the injection pressure there inject into the combustion chambers of the internal combustion engine.

Die Hochdruck-Einspritzventile eines Kraftstoffzumeßsystems einer direkteinspritzenden Benzin-Brennkraftmaschine öffnen nach der Ansteuerung mittels Magnetkraft. Die Magnetkraft wird von einem Elektromagneten erzeugt, der Teil des Einspritzventiles ist. In nicht angesteuertem Zustand ist das Einspritzventil geschlossen; ein Dichtelement des Einspritzventils wird mittels eines Federelements auf einen Ventilsitz gedrückt. Beim Öffnen des Einspritzventils wird das Dichtelement durch die Magnetkraft des Elektromagneten von dem Ventilsitz abgehoben. Dabei muß die Federkraft des Federelements und die hydraulische Kraft des in dem Hochdruckspeicher herrschenden Einspritzdrucks überwunden werden. Um eine derart große Magnetkraft erzielen zu können, wird der Elektromagnet in der Praxis mit Spannungen betrieben, die wesentlich höher sind als die Batteriespannung der Fahrzeugbatterie liegen (sog. Booster-Betrieb).The high pressure injectors of a fuel metering system open a direct-injection gasoline engine after activation by magnetic force. The magnetic force is generated by an electromagnet that is part of the Injector is. Is not activated the injector closed; a sealing element of the Injector is placed on a spring element Valve seat pressed. When opening the injection valve the sealing element by the magnetic force of the electromagnet lifted off the valve seat. The spring force of the Spring element and the hydraulic force in the High pressure accumulator prevailing injection pressure overcome become. To achieve such a large magnetic force can, the electromagnet is in practice with voltages operated that are significantly higher than that The battery voltage of the vehicle battery is (so-called booster mode).

Aufgrund von Fertigungstoleranzen oder aufgrund eines Verschleißes der Einspritzventile kann es dazu kommen, dass die von dem Elektromagneten erzeugte Magnetkraft nicht ausreicht, die Federkraft und die hydraulische Kraft bei maximalem Einspritzdruck zu überwinden, und das Einspritzventil bleibt trotz Ansteuerung geschlossen. Das ist bspw. der Fall, wenn zwischen den bewegten mechanischen Teilen des Einspritzventils eine erhöhte Reibung auftritt, wobei beim Öffnen des Einspritzventils zusätzlich zu der Federkraft und der hydraulischen Kraft dann auch noch die Reibungskraft zu überwinden ist. Außerdem kann es aufgrund von Fertigungstoleranzen und eines Verschleißes der Teile des Kraftstoffzumeßsystemes, die den Einspritzdruck in dem Hochdruckspeicher steuern bzw. regeln, zu einem Anstieg des Einspritzdrucks in dem Hochdruckspeicher kommen. Auch in einem solchen Fall reicht die Magnetkraft des Elektromagneten häufig nicht aus, um die hydraulische Kraft und die Federkraft zu überwinden, und das Einspritzventil bleibt trotz Ansteuerung geschlossen. Schließlich ist es auch denkbar, dass das Einspritzventil während des Booster-Betriebs zwar noch kurz öffnet, in der darauffolgenden Phase des geringeren Haltestroms wieder zufällt. Ein trotz Ansteuerung geschlossenes Einspritzventil führt zu Aussetzern und somit zu einem unrunden Lauf der Brennkraftmaschine und zu einem verschlechterten Abgasverhalten der Brennkraftmaschine.Due to manufacturing tolerances or due to a Wear on the injection valves can lead to the fact that the magnetic force generated by the electromagnet is not sufficient, the spring force and the hydraulic force to overcome maximum injection pressure, and that The injection valve remains closed despite being activated. The is the case, for example, if between the moving mechanical Parts of the injector experience increased friction where in addition to opening the injector Spring force and the hydraulic force Frictional force has to be overcome. It can also be due to of manufacturing tolerances and wear of the parts of the fuel metering system, which the injection pressure in the Control or regulating high pressure accumulators, to an increase in Injection pressure in the high pressure accumulator. Also in In such a case, the magnetic force of the Electromagnets often fail to deliver hydraulic power and overcome the spring force, and the injector remains closed despite activation. After all it is also conceivable that the injection valve during the booster operation opens briefly in the following Phase of the lower holding current falls again. A defiance Activation of the closed injection valve leads to Misfires and thus to a non-round run of Internal combustion engine and deteriorated Exhaust gas behavior of the internal combustion engine.

Um dieses Problem von trotz Ansteuerung nicht öffnenden Einspritzventilen zu lösen, kann der maximale Einspritzdruck, auf den geregelt wird, in dem Hochdruckspeicher so weit verringert werden, dass unter Berücksichtigung aller Fertigungstoleranzen und des Verschleißes der Einspritzventile alle Einspritzventile mit Sicherheit öffnen und während der gesamten vorgegebenen Einspritzdauer geöffnet bleiben. Bei einem derart eingestellten Einspritzdruck können die Ressourcen eines Kraftstoffzumeßsystems jedoch nicht optimal ausgeschöpft werden.To this problem of not opening despite activation Solving injectors can be the maximum Injection pressure to which is regulated in the High pressure accumulator can be reduced so far that under Taking into account all manufacturing tolerances and the Wear of the injectors with all injectors Open security and throughout the given Keep injection duration open. With such a set injection pressure can save the resources of a However, the fuel metering system has not been optimally used become.

Es ist deshalb die Aufgabe der vorliegenden Erfindung, den maximalen Einspritzdruck in einem Hochdruckspeicher einer direkteinspritzenden Benzin-Brennkraftmaschine derart einzustellen, dass einerseits alle Einspritzventile des Kraftstoffzumeßsystems mit Sicherheit öffnen und andererseits die Ressourcen des Kraftstoffzumeßsystems optimal ausgenutzt werden können. It is therefore the object of the present invention maximum injection pressure in a high pressure accumulator direct-injection gasoline engine such adjust that on the one hand all injectors of the Open fuel metering system with safety and on the other hand, the resources of the fuel metering system can be optimally used.

Zur Lösung dieser Aufgabe schlägt die Erfindung, ausgehend von dem Verfahren zur Adaption eines maximalen Einspritzdrucks der eingangs genannten Art die nachfolgenden Schritte vor:

  • Einstellen eines bestimmten Einspritzdrucks als Anfangsdruck;
  • Erhöhen des Einspritzdrucks ausgehend von dem Anfangsdruck bei gleichzeitigem Überprüfen, ob die Einspritzventile öffnen;
  • Beenden der Erhöhung des Einspritzdrucks, sobald mindestens eines der Einspritzventile nicht mehr öffnet;
  • Verringern des Einspritzdrucks um einen vorgegebenen Betrag; und
  • Heranziehen des verringerten Einspritzdrucks als maximalen Einspritzdruck des Hochdruckspeichers.
To achieve this object, the invention proposes the following steps, starting from the method for adapting a maximum injection pressure of the type mentioned at the beginning:
  • Setting a certain injection pressure as the initial pressure;
  • Increasing the injection pressure from the initial pressure while checking whether the injectors open;
  • Ceasing to increase the injection pressure as soon as at least one of the injection valves no longer opens;
  • Reducing the injection pressure by a predetermined amount; and
  • Using the reduced injection pressure as the maximum injection pressure of the high-pressure accumulator.

Vorteile der ErfindungAdvantages of the invention

Der Anfangsdruck, auf den der Einspritzdruck in dem Hochdruckspeicher am Anfang des erfindungsgemäßen Verfahrens eingestellt wird, entspricht bspw. dem Einspritzdruck, der nach dem Stand der Technik in dem Hochdruckspeicher eingestellt wird. Der Anfangsdruck kann für Brennkraftmaschinen desselben Typs gleich groß gewählt werden. Bei in dem Hochdruckspeicher anliegendem Anfangsdruck ist eine optimale Ausnutzung der Ressourcen des Kraftstoffzumeßsystems nicht möglich.The initial pressure at which the injection pressure in the High-pressure accumulator at the beginning of the invention The procedure is set, for example Injection pressure, which according to the prior art in the High pressure accumulator is set. The initial pressure can selected the same size for internal combustion engines of the same type become. When in the high pressure accumulator Initial pressure is an optimal use of resources of the fuel metering system is not possible.

Ausgehend von diesem Anfangsdruck wird der Einspritzdruck in dem Hochdruckspeicher in den Betriebspunkten, in denen der maximale Einspritzdruck gefordert ist, erhöht. Die Druckerhöhung erfolgt vorzugsweise stetig. Gleichzeitig wird überprüft, ob die Einspritzventile öffnen. Solange alle Einspritzventile öffnen, wird der Einspritzdruck weiter erhöht.Starting from this initial pressure, the injection pressure becomes in the high pressure accumulator in the operating points where the maximum injection pressure is required increased. The The pressure is preferably increased continuously. At the same time it is checked whether the injection valves open. As long as open all injectors, the injection pressure further increased.

Sobald jedoch mindestens eines der Einspritzventile nicht mehr öffnet, wird der Einspritzdruck nicht mehr weiter erhöht. Ausgehend von dem zu diesem Zeitpunkt erreichten Einspritzdruck wird der Einspritzdruck dann um einen vorgegebenen Betrag verringert. Der vorgegebene Betrag ist so gewählt, dass bei dem verringerten Einspritzdruck alle Einspritzventile öffnen. Es ist auch denkbar, dass der Einspritzdruck ausgehend von dem erreichten Einspritzdruck langsam verringert wird, bis wieder alle Einspritzventile öffnen. In diesem Fall wäre der vorgegebene Betrag also variabel. Der verringerte Einspritzdruck wird schließlich als maximaler Einspritzdruck des Hochdruckspeichers herangezogen.However, as soon as at least one of the injectors fails opens, the injection pressure no longer increases elevated. Based on the achieved at that time Injection pressure then becomes one predetermined amount decreased. The default amount is chosen so that at the reduced injection pressure all Open injectors. It is also conceivable that the Injection pressure based on the injection pressure reached is slowly reduced until all the injectors again to open. In this case, the predetermined amount would be variable. The reduced injection pressure will eventually as the maximum injection pressure of the high-pressure accumulator used.

Mit Hilfe des erfindungsgemäßen Verfahrens kann der maximale Einspritzdruck in dem Hochdruckspeicher einerseits so niedrig gewählt werden, dass noch alle Einspritzventile des Kraftstoffzumeßsystems mit Sicherheit öffnen. Andererseits wird der Einspritzdruck aber so hoch gewählt, dass eine optimale Ausnutzung der Ressourcen des Kraftstoffzumeßsystems gewährleistet ist.With the help of the method according to the invention maximum injection pressure in the high pressure accumulator on the one hand be chosen so low that all injectors are still open the fuel metering system with certainty. On the other hand, the injection pressure is chosen so high that optimal use of the resources of the Fuel metering system is guaranteed.

Mit dem erfindungsgemäßen Verfahren wird der maximale Einspritzdruck des Hochdruckspeichers für jedes einzelne Kraftstoffzumeßsystem individuell adaptiert. Dadurch können auch Fertigungstoleranzen und ein Verschleiß der Einspritzventile bei jedem Kraftstoffzumeßsystem individuell berücksichtigt werden. Somit kann für jede einzelne Brennkraftmaschine ein gleichmäßiger Lauf der Brennkraftmaschine und ein gleichbleibend gutes Abgasverhalten bei gleichzeitiger Ausnutzung der vollen Ressourcen des Kraftstoffzumeßsystems gewährleistet werden.With the method according to the invention, the maximum Injection pressure of the high pressure accumulator for each one Customized fuel metering system. This allows also manufacturing tolerances and wear of the Injectors in every fuel metering system be considered individually. So for everyone single internal combustion engine smooth running Internal combustion engine and a consistently good one Emission behavior while using the full Resources of the fuel metering system are guaranteed.

Gemäß einer vorteilhaften Weiterbildung der Erfindung wird vorgeschlagen, dass der Anfangsdruck derart eingestellt wird, dass unter Berücksichtigung aller Fertigungstoleranzen und des Verschleißes der Einspritzventile alle Einspritzventile mit Sicherheit öffnen. Sollte sich bei der Durchführung des erfindungsgemäßen Verfahrens dennoch der Fall einstellen, dass mindestens eines der Einspritzventile bei dem Anfangsdruck nicht öffnet, so wird dieses Einspritzventil, das Kraftstoffzumeßsystem oder die gesamte Brennkraftmaschine als fehlerhaft klassifiziert und repariert oder ausgetauscht.According to an advantageous development of the invention suggested that the initial pressure be set in this way will that considering all Manufacturing tolerances and wear of the Injectors all injectors with certainty to open. Should the implementation of the the method according to the invention nevertheless terminate the case, that at least one of the injectors in the Initial pressure does not open, so this injector, the fuel metering system or the whole Internal combustion engine classified as faulty and repaired or replaced.

Gemäß einer bevorzugten Ausführungsform der vorliegenden Erfindung wird vorgeschlagen, dass eine Meldung ausgegeben wird, falls der maximale Einspritzdruck des Hochdruckspeichers unterhalb einer vorgebbaren Druckschwelle liegt. Gemäß diesem Ausführungsbeispiel wird also eine Meldung ausgegeben, falls der adaptierte maximale Einspritzdruck oberhalb des Anfangsdrucks aber unterhalb einer vorgebbaren Druckschwelle liegt. Diese Meldung kann entweder einem Steuergerät einer Brennkraftmaschine zur Weiterverarbeitung zugeführt werden. Oder aber die Meldung wird einer außenstehenden Person zur Weiterverarbeitung bzw. zur Einleitung entsprechender Schritte mitgeteilt. Die Meldung kann bspw. als eine optische oder akustische Fehlermeldung oder als eine Anzeige des adaptieren maximalen Einspritzdrucks ausgebildet sein.According to a preferred embodiment of the present Invention it is proposed that a message be output if the maximum injection pressure of the High pressure storage below a predeterminable Pressure threshold. According to this embodiment So a message is issued if the adapted maximum Injection pressure above the initial pressure but below a predefinable pressure threshold. This message can either a control unit of an internal combustion engine Further processing can be supplied. Or the message becomes an outside person for further processing or to initiate appropriate steps. The Message can be, for example, as an optical or acoustic Error message or as a display of adapt maximum injection pressure.

Das erfindungsgemäße Verfahren wird vorteilhafterweise nach der Montage oder der Reparatur, insbesondere nach dem Austausch von mindestens einem Einspritzventil, des Kraftstoffzumeßsystems durchgeführt. Dazu kann ein von außen anliegendes Signal einen besonderen Betriebszustand der Brennkraftmaschine erzwingen, in dem z. B. im Leerlauf maximaler Einspritzdruck gefordert wird und die Adaption betriebspunktunabhängig einmal erfolgt.The process according to the invention is advantageously carried out according to assembly or repair, especially after Exchange of at least one fuel injector, the Fuel metering system performed. One of external signal a special operating state force the internal combustion engine in which, for. B. idle maximum injection pressure is required and the adaptation once, regardless of the operating point.

Alternativ wird vorgeschlagen, das Verfahren in vorgebbaren zeitlichen Abständen, insbesondere nach einer vorgebbaren Anzahl von Fahrzyklen oder nach einer vorgebbaren Betriebsdauer, durchzuführen. Der maximale Einspritzdruck wird in Abhängigkeit von alterungs- und verschleißbedingten Änderungen der Einspritzventile und/oder Änderungen der drucksteuernden bzw. druckregelnden Teile des Kraftstoffzumeßsystems eingestellt. Die Änderungen erfolgen mit so großen Zeitkonstante, dass eine Adaption des maximalen Einspritzdrucks in relativ großen zeitlichen Abständen, bspw. monatlich, völlig ausreichend ist.Alternatively, it is proposed that the method be predefined time intervals, especially after a specifiable Number of driving cycles or after a specifiable one Operating time. The maximum injection pressure is dependent on aging and wear Changes in the injection valves and / or changes in the pressure-controlling or pressure-regulating parts of the Fuel metering system set. The changes are made with such a large time constant that an adaptation of the maximum injection pressure in relatively large temporal Intervals, for example monthly, is completely sufficient.

Gemäß einer weiteren bevorzugten Ausführungsform der vorliegenden Erfindung wird vorgeschlagen, dass das Verfahren am Bandende ausgeführt wird.According to a further preferred embodiment of the The present invention proposes that Procedure is carried out at the end of the line.

Zeichnungendrawings

Ein bevorzugtes Ausführungsbeispiel der vorliegenden Erfindung wird im folgenden anhand der Zeichnungen näher erläutert. Es zeigt:

Figur 1
ein Ablaufdiagramm eines erfindungsgemäßen Verfahrens gemäß einer bevorzugten Ausführungsform.
A preferred embodiment of the present invention is explained below with reference to the drawings. It shows:
Figure 1
a flowchart of a method according to the invention according to a preferred embodiment.

Das in Figur 1 dargestellte erfindungsgemäße Verfahren dient zur Adaption eines in einem Hochdruckspeicher eines Kraftstoffzumeßsystems einer direkteinspritzenden Benzin-Brennkraftmaschine herrschenden maximalen Einspritzdrucks. Von dem Hochdruckspeicher zweigen mehrere betriebsgrößenabhängig steuerbare Einspritzventile ab, die zum Zumessen von Kraftstoff aus dem Hochdruckspeicher in Brennräume der Brennkraftmaschine dienen.The inventive method shown in Figure 1 is used to adapt one in a high pressure accumulator Fuel metering system of a direct-injection gasoline engine prevailing maximum injection pressure. Several branches of the high-pressure accumulator Controllable injectors depending on the operating size for metering fuel from the high pressure accumulator in Combustion chambers of the internal combustion engine serve.

Das erfindungsgemäße Verfahren wird ausgeführt, wenn sich die Brennkraftmaschine in einem Betriebszustand befindet, in dem der maximale Einspritzdruck gefordert ist. Das Verfahren beginnt in Funktionsblock 1. In einem nachfolgenden Funktionsblock 2 wird ein bestimmter Einspritzdruck als Anfangsdruck in dem Hochdruckspeicher bestimmt. Der Anfangsdruck wird derart bestimmt, dass unter Berücksichtigung aller Fertigungstoleranzen und des Verschleißes der Einspritzventile alle Einspritzventile mit Sicherheit öffnen.The method according to the invention is carried out when the internal combustion engine is in an operating state, in which the maximum injection pressure is required. The The process begins in function block 1. In a subsequent function block 2 becomes a specific one Injection pressure as the initial pressure in the high pressure accumulator certainly. The initial pressure is determined such that under Taking into account all manufacturing tolerances and the Wear of the injectors with all injectors Open security.

In einem nachfolgenden Funktionsblock 3 wird nach einer gezielten Anforderung, bspw. durch eine Werkstatt, der Anfangsdruck in dem Hochdruckspeicher eingestellt. Alternativ kann auch in eine Warteschleife verzweigt werden, in der überprüft wird, ob der aktuelle Betriebszustand der Brennkraftmaschine einen maximalen Einspritzdruck erfordert. Die Warteschleife wird verlassen, sobald sich die Brennkraftmaschine in einen Betriebszustand befindet, in dem der maximale Einspritzdruck gefordert ist.In a subsequent function block 3, a targeted requirement, for example by a workshop that Initial pressure set in the high pressure accumulator. Alternatively, you can branch to a waiting loop in which it is checked whether the current Operating state of the internal combustion engine a maximum Injection pressure required. The queue is exited as soon as the internal combustion engine is in an operating state in which the maximum injection pressure is required.

Dann wird in einem Abfrageblock 4 überprüft, ob bei dem in dem Hochdruckspeicher eingestellten Einspritzdurck alle Einspritzventile öffnen. Falls alle Einspritzventile öffnen, wird in einem Funktionsblock 5 der Einspritzdruck in dem Hochdruckspeicher um ein Inkrement erhöht. Anschließend wird in dem Abfrageblock 4 wieder überprüft, ob alle Einspritzventile öffnen. Der Einspritzdruck wird solange jeweils um ein Inkrement erhöht, bzw. die Schleife bestehend aus dem Abfrageblock 4 und dem Funktionsblock 5 wird so lange durchlaufen, bis mindestens eines der Einspritzventile nicht mehr öffnet. It is then checked in a query block 4 whether the in the injection pressure set in the high pressure accumulator all Open injectors. If all injectors open, the injection pressure is in a function block 5 increased by an increment in the high-pressure accumulator. It is then checked again in the query block 4, whether all injectors open. The injection pressure will as long as increased by one increment, or the loop consisting of the query block 4 and the function block 5 is run through until at least one of the Injector no longer opens.

Dann wird ausgehend von dem Abfrageblock 4 zu einem Funktionsblock 6 verzweigt, wo der Einspritzdruck in dem Hochdruckspeicher um ein Inkrement verringert wird. Zur Sicherheit wird in einem anschließenden Abfrageblock 7 noch einmal überprüft, ob nun wieder alle Einspritzventile öffnen. Falls dem nicht so ist, wird zu dem Funktionsblock 6 verzweigt, wo der Einspritzdruck noch einmal um ein Inkrement verringert wird. Die Schleife bestehend aus dem Funktionsblock 6 und dem Abfrageblock 7 wird so lange durchlaufen, bis wieder alle Einspritzventile öffnen. Dann wird in einen Funktionsblock 8 verzweigt, wo der nunmehr in dem Hochdruckspeicher eingestellte Einspritzdruck als maximaler Einspritzdruck des Hochdruckspeichers herangezogen wird. In einem abschließenden Funktionsblock 9 ist das erfindungsgemäße Verfahren beendet. Darüber hinaus wird das Verfahren auch immer dann beendet, wenn der Einspritzdruck in dem Hochdruckspeicher aufgrund des Betriebszustands der Brennkraftmaschine den maximalen Druckbereich verläßt.Then starting from the query block 4 becomes one Function block 6 branches where the injection pressure in the High pressure accumulator is reduced by one increment. For Security is still in a subsequent query block 7 once checked whether all injectors again to open. If not, the function block becomes 6 branches where the injection pressure again by one Increment is decreased. The loop consisting of the Function block 6 and the query block 7 will last run until all injectors open again. Then is branched into a function block 8, where the now in injection pressure set as high pressure accumulator maximum injection pressure of the high pressure accumulator is used. In a final function block 9 the method according to the invention has ended. Furthermore the procedure is always ended when the Injection pressure in the high pressure accumulator due to the Operating state of the internal combustion engine the maximum Leaves print area.

Das erfindungsgemäße Verfahren kann nach der Montage der Brennkraftmaschine am Bandende oder nach der Reparatur, insbesondere nach dem Austausch von mindestens einem Einspritzventil, des Kraftstoffzumeßsystems oder der Brennkraftmaschine ausgeführt werden. Alternativ kann das Verfahren aber auch in vorgebbaren zeitlichen Abständen insbesondere nach einer vorgebbaren Anzahl von Fahrzyklen oder nach einer vorgebbaren Betriebsdauer, ausgeführt werden.The method according to the invention can be installed after the Internal combustion engine at the end of the line or after repair, especially after replacing at least one Injector, fuel metering system or Internal combustion engine are running. Alternatively, it can Procedures but also at predefinable time intervals especially after a predeterminable number of driving cycles or after a predefinable operating time become.

Claims (7)

Verfahren zur Adaption eines in einem Hochdruckspeicher eines Kraftstoffzumesssystems einer direkteinspritzenden Brennkraftmaschine herrschenden maximalen Einspritzdrucks, wobei von dem Hochdruckspeicher mehrere betriebsgrößenabhängig steuerbare Einspritzventile zum Zumessen von Kraftstoff aus dem Hochdruckspeicher in Brennräume der Brennkraftmaschine abzweigen, gekennzeichnet durch die nachfolgenden Schritte: Einstellen eines bestimmten Einspritzdrucks als Anfangsdruck; Erhöhen des Einspritzdrucks ausgehend von dem Anfangsdruck bei gleichzeitigem Überprüfen, ob die Einspritzventile öffnen; Beenden der Erhöhung des Einspritzsdrucks, sobald mindestens eines der Einspritzventile nicht mehr öffnet; Verringern des Einspritzdrucks um einen vorgegebenen Betrag; und Heranziehen des verringerten Einspritzdrucks als maximalen Einspritzdruck des Hochdruckspeichers. Method for adapting a maximum injection pressure prevailing in a high-pressure accumulator of a fuel metering system of a direct-injection internal combustion engine, wherein a plurality of injectors which can be controlled depending on the operating variable and metering fuel from the high-pressure accumulator branch off into the combustion chambers of the internal combustion engine from the high-pressure accumulator, characterized by the following steps: Setting a certain injection pressure as the initial pressure; Increasing the injection pressure from the initial pressure while checking whether the injectors open; Ceasing to increase the injection pressure as soon as at least one of the injection valves no longer opens; Reducing the injection pressure by a predetermined amount; and Using the reduced injection pressure as the maximum injection pressure of the high-pressure accumulator. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Anfangsdruck derart eingestellt wird, dass unter Berücksichtigung aller Fertigungstoleranzen und des Verschleißes der Einspritzventile alle Einspritzventile mit Sicherheit öffnen und während der gesamten vorgegebenen Einspritzdauer geöffnet bleiben. A method according to claim 1, characterized in that the initial pressure is set so that under Taking into account all manufacturing tolerances and the Wear of the injectors with all injectors Open security and throughout the given Keep injection duration open. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass eine Meldung ausgegeben wird, falls der maximale Einspritzdruck des Hochdruckspeichers unterhalb einer vorgebbaren Druckschwelle liegt.A method according to claim 1 or 2, characterized marked that a message is output if the maximum injection pressure of the high pressure accumulator is below a predefinable pressure threshold. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Verfahren nach der Montage oder der Reparatur, insbesondere nach dem Austausch von mindestens einem Einspritzventil, des Kraftstoffzumesssystems ausgeführt wird.Method according to one of claims 1 to 3, characterized characterized that the procedure after assembly or the repair, especially after the exchange of at least one injection valve, the Fuel metering system is running. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Verfahren in vorgebbaren zeitlichen Abständen ausgeführt wird.Method according to one of claims 1 to 4, characterized characterized that the procedure in predeterminable time intervals is executed. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass das Verfahren nach einer vorgebbaren Anzahl von Fahrzyklen oder nach einer vorgebbaren Betriebsdauer ausgeführt wird.A method according to claim 5, characterized in that the method after a predeterminable number of Driving cycles or after a predefinable operating time is performed. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass das Verfahren am Bandende ausgeführt wird.A method according to claim 4, characterized in that the process is carried out at the end of the line.
EP01100564A 2000-02-05 2001-01-10 Method for adaptation of maximum injection pressure in high pressure accumulator Expired - Lifetime EP1122418B1 (en)

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EP0501459A2 (en) * 1991-02-27 1992-09-02 Nippondenso Co., Ltd. Common-rail fuel injection system and related method
DE19622757A1 (en) * 1995-11-09 1997-05-15 Bosch Gmbh Robert Fuel injection system for IC engine
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EP0860600A2 (en) * 1997-02-21 1998-08-26 Toyota Jidosha Kabushiki Kaisha A fuel injection system for an internal combustion engine

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EP1122418B1 (en) 2004-05-26
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KR100730664B1 (en) 2007-06-22
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DE50102369D1 (en) 2004-07-01
JP2001241351A (en) 2001-09-07

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