EP0748930A2 - Method for detecting operating failures in a fuel injection apparatus for an internal combustion engine - Google Patents
Method for detecting operating failures in a fuel injection apparatus for an internal combustion engine Download PDFInfo
- Publication number
- EP0748930A2 EP0748930A2 EP96106869A EP96106869A EP0748930A2 EP 0748930 A2 EP0748930 A2 EP 0748930A2 EP 96106869 A EP96106869 A EP 96106869A EP 96106869 A EP96106869 A EP 96106869A EP 0748930 A2 EP0748930 A2 EP 0748930A2
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- EP
- European Patent Office
- Prior art keywords
- pressure
- injection
- internal combustion
- combustion engine
- delivery
- 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
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- 238000002347 injection Methods 0.000 title claims abstract description 40
- 239000007924 injection Substances 0.000 title claims abstract description 40
- 239000000446 fuel Substances 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000002485 combustion reaction Methods 0.000 title claims description 12
- 238000012384 transportation and delivery Methods 0.000 claims abstract description 24
- 230000007257 malfunction Effects 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 5
- 230000007704 transition Effects 0.000 claims description 3
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 241001136792 Alle Species 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
-
- 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
-
- 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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
- F02D2041/225—Leakage detection
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0602—Fuel pressure
-
- 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 invention relates to a method for identifying malfunctions in a fuel injection system of an internal combustion engine according to the features specified in the preamble of claim 1.
- EP 0 501 459 A2 discloses a method in which fuel is pumped under high pressure into a common supply line (common rail) provided for all nozzles by a high-pressure pump.
- This injection system uses means to detect malfunctions, e.g. faulty high-pressure pumps can be determined.
- the injection system consisting of the components, such as nozzle or injector, common supply line, check valve and injection lines between injector and supply line, is constantly subjected to the high storage pressure. Malfunctions, e.g. leakage from these components would result in high fuel loss. The storage pressure in the supply line can no longer be built up. The result is faulty injection and thus an engine malfunction, which can lead to failure of the overall system if it is not recognized early.
- the invention is therefore based on the object of making it possible, by means of special measures, to reliably control the leakage of components in the fuel injection system.
- the pressure of at least two points in time of the respectively assigned block is to be detected and the pressure determined Large leaks can be easily determined by displaying the pressure difference only when a defined limit value is exceeded.
- the detection of large leaks is particularly useful in an injection system as a common rail system.
- the pressure in the high-pressure accumulator or in the common supply line intended for all solenoid valve-controlled nozzles is constantly changed by the various processes, such as delivery and injection, in normal, that is, trouble-free operation.
- Each injection leads to a usual rapid drop in pressure, which, however, is compensated for in the subsequent delivery of the high-pressure pump.
- An additional pressure drop as a result of a leak is thus recognized by the special process steps and displayed.
- the determination of the pressure curve can, however, be made more difficult if the fuel volumes between the pressure pump and the nozzles or injectors are small. In this case, the system pressure is strongly influenced by reflection waves.
- Leakages that occur can be detected in a simple manner by the method steps according to the invention.
- a fuel injection system 1 of a multi-cylinder internal combustion engine 2 which essentially consists of a demand-controlled high-pressure pump 3 and an injection line system 4 with a common high-pressure supply line 9 provided for all solenoid valve-controlled nozzles or injectors 5, 6, 7, 8.
- a pressure sensor denoted by 10 measures the actual pressure in the high-pressure supply line 9. Deviations from the target pressure in the respective operating range are compensated for by an electronic control unit 11 in that a controlled adjusting element 12 regulates the predetermined pressure on the high-pressure pump 3.
- the pressure sensor 10 is not only used to regulate the high-pressure control circuit in order to maintain a certain pressure level, but is also used to determine leaks in the high-pressure-side line system, which is discussed in more detail below.
- the pressure sensor 10 detects the respective pressure at the predetermined time t 1 and t 2 . Both times are chosen between the end of injection E E and the start of delivery F B. With trouble-free, that is, a dense line system results in a pressure curve shown with a solid line in FIG. 3. There is no significant pressure difference between the determined pressures at t 1 and t 2 and possibly t 3 .
- this status is displayed as a fault.
- This method which can be used to detect large leaks, is particularly suitable for piping systems with large fuel volumes between the high pressure pump and the injectors.
- a method is provided in which, during normal operation of the internal combustion engine, at least one delivery and at least one injection are forcedly switched off at irregular intervals.
- the rail pressure curve for an intact system and for a leaky system is similar to that according to FIG. 3.
- the time t 1 can be selected after the transition to overrun at the earliest within the second revolution of the crankshaft for determining the rail pressure.
- the first revolution of the crankshaft can be used to calm the pressure fluctuations in the system.
- the rail pressure is measured at several points in time, for example within ten revolutions of the crankshaft, and the pressure drop rate is determined from the measurements, which is displayed as a fault if a certain limit value is exceeded.
- the times for pressure detection can also be selected at a higher pressure level, namely between the end of delivery F E and the start of injection E B.
- the times are denoted by t 1 'and t 2 ' and shown as an example in FIG.
- the determination of the times t 1 'and t 2 ' applies equally to the other versions.
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)
- Combined Controls Of Internal Combustion Engines (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zum Erkennen von Betriebsstörungen in einer Kraftstoffeinspritzanlage einer Brennkraftmaschine nach den im Oberbegriff des Patentanspruchs 1 angegebenen Merkmalen.The invention relates to a method for identifying malfunctions in a fuel injection system of an internal combustion engine according to the features specified in the preamble of claim 1.
Aus der EP 0 501 459 A2 ist ein Verfahren bekannt, bei dem von einer Hochdruckpumpe Kraftstoff unter hohem Druck in eine für alle Düsen vorgesehenen gemeinsamen Versorgungsleitung (Common Rail) gefördert wird. Bei diesem Einspritzsystem sind Mittel zum Aufspüren von Betriebsstörungen eingesetzt, durch die z.B. fehlerhaft arbeitende Hochdruckpumpen ermittelt werden können.EP 0 501 459 A2 discloses a method in which fuel is pumped under high pressure into a common supply line (common rail) provided for all nozzles by a high-pressure pump. This injection system uses means to detect malfunctions, e.g. faulty high-pressure pumps can be determined.
Das hierbei aus den Komponenten, wie Düse bzw. Injektor, gemeinsame Versorgungsleitung, Rückschlagventil und Einspritzleitungen zwischen Injektor und Versorgungsleitung bestehende Einspritzsystem wird ständig mit dem hohen Speicherdruck beaufschlagt. Betriebsstörungen, die z.B. aus Undichtigkeiten dieser Komponenten resultieren, würden einen hohen Kraftstoffverlust bedeuten. Der Speicherdruck in der Versorgungsleitung kann nicht mehr aufgebaut werden. Die Folge ist eine fehlerhafte Einspritzung und damit eine Betriebsstörung des Motors, die bei nicht frühzeitigem Erkennen zum Ausfall des Gesamtsystems führen kann.The injection system consisting of the components, such as nozzle or injector, common supply line, check valve and injection lines between injector and supply line, is constantly subjected to the high storage pressure. Malfunctions, e.g. leakage from these components would result in high fuel loss. The storage pressure in the supply line can no longer be built up. The result is faulty injection and thus an engine malfunction, which can lead to failure of the overall system if it is not recognized early.
Der Erfindung liegt daher die Aufgabe zugrunde, durch besondere Maßnahmen eine sichere Kontrolle über auftretende Undichtigkeiten von Komponenten in der Kraftstoffeinspritzanlage zu ermöglichen.The invention is therefore based on the object of making it possible, by means of special measures, to reliably control the leakage of components in the fuel injection system.
Zur Lösung der Aufgabe dienen die im Kennzeichen der unabhängigen Patentansprüche 1,2 und 3 angegebenen Merkmale.The features specified in the characterizing part of
In dem Unteranspruch ist noch eine förderliche Weiterbildung der Erfindung angegeben.In the subclaim a further development of the invention is given.
Durch die erfindungsgemäßen Verfahrensschritte gemäß Anspruch 1, nämlich in dem einen Block zwischen dem Ende einer Einspritzung und dem Förderbeginn oder in dem anderen Block zwischen dem Ende der Förderung und dem Beginn der Einspritzung den Druck mindestens zweier Zeitpunkte des jeweilig zugeordneten Blocks zu erfassen und die ermittelte Druckdifferenz erst bei Überschreiten eines definierten Grenzwertes anzuzeigen, können auf einfache Weise große Undichtigkeiten festgestellt werden.By the method steps according to the invention according to claim 1, namely in one block between the end of an injection and the start of delivery or in the other block between the end of delivery and the start of injection, the pressure of at least two points in time of the respectively assigned block is to be detected and the pressure determined Large leaks can be easily determined by displaying the pressure difference only when a defined limit value is exceeded.
Die Ermittlung von großen Undichtigkeiten bietet sich insbesondere bei einem Einspritzsystem als Common-Rail-System an. Bei diesen Systemen wird im normalen, also störungsfreien Betrieb der Druck im Hochdruckspeicher bzw. in der für alle magnetventilgesteuerten Düsen bestimmten gemeinsamen Versorgungsleitung durch die verschiedenen Vorgänge, wie Förderung und Einspritzung dauernd verändert. Jede Einspritzung führt hierbei zu einer üblichen rapiden Druckabsenkung, die allerdings in der nachfolgenden Förderung der Hochdruckpumpe wieder ausgeglichen wird. Ein zusätzlicher Druckabfall als Folge einer Undichtigkeit wird somit durch die besonderen Verfahrensschritte erkannt und zur Anzeige gebracht.The detection of large leaks is particularly useful in an injection system as a common rail system. With these systems, the pressure in the high-pressure accumulator or in the common supply line intended for all solenoid valve-controlled nozzles is constantly changed by the various processes, such as delivery and injection, in normal, that is, trouble-free operation. Each injection leads to a usual rapid drop in pressure, which, however, is compensated for in the subsequent delivery of the high-pressure pump. An additional pressure drop as a result of a leak is thus recognized by the special process steps and displayed.
Die Ermittlung des Druckverlaufs kann aber erschwert werden, wenn die Kraftstoffvolumina zwischen der Druckpumpe und den Düsen bzw. Injektoren klein sind. In diesem Fall wird der Systemdruck von Reflexionswellen stark beeinflußt.The determination of the pressure curve can, however, be made more difficult if the fuel volumes between the pressure pump and the nozzles or injectors are small. In this case, the system pressure is strongly influenced by reflection waves.
Durch Abschaltung eines oder mehrerer Zylinder während des Betriebes der Brennkraftmaschine, indem mindestens eine der nächstfolgenden Einspritzungen und Förderungen ausgesetzt wird, ist trotz der kleinen Volumina eine exakte Messung zum Erkennen von Undichtigkeiten durchführbar.
Die Ermittlung des Druckverlaufes kann aber auch dann erschwert werden, wenn im System zwischen der Druckpumpe und den Düsen bzw. Injektoren kleine Undichtigkeiten auftreten. Die Druckregelung im System würde kleine Undichtigkeiten durch erhöhte Förderleistung der Druckpumpe ausgleichen wollen.By switching off one or more cylinders during the operation of the internal combustion engine by at least one of the next injections and deliveries being suspended, Despite the small volumes, an exact measurement for detecting leaks can be carried out.
The determination of the pressure curve can also be made more difficult if small leaks occur in the system between the pressure pump and the nozzles or injectors. The pressure control in the system would want to compensate for small leaks by increasing the delivery capacity of the pressure pump.
Durch die erfindungsgemäßen Verfahrensschritte gemäß Anspruch 3 sind auftretende Undichtigkeiten auf einfache Weise aufspürbar.Leakages that occur can be detected in a simple manner by the method steps according to the invention.
Die Erfindung wird in der Zeichnung dargestellt und im folgenden näher erläutert. Es zeigen:
- Fig. 1
- eine Kraftstoffeinspritzanlage mit einer Druckversorgungsleitung als gemeinsame Hochdruckversorgungsleitung für alle magnetventilgesteuerten Düsen bzw. Injektoren,
- Fig. 2
- in einem Diagramm den synchronen Verlauf des Drucks, der Förderung und der Einspritzung,
- Fig. 3
- in vergrößerter Darstellung den Druckverlauf bei störungsfreiem und undichtem System, jeweils im Motorbetrieb,
- Fig. 4
- in vergrößerter Darstellung den Druckverlauf bei störungsfreiem und undichtem System, jeweils im Motorbetrieb, allerdings bei ausgesetzter Förderung und Einspritzung,
- Fig. 5
- den Druckverlauf bei undichtem System im Schubbetrieb, bei dem die Förderung und die Einspritzung abgeschaltet ist.
- Fig. 1
- a fuel injection system with a pressure supply line as a common high-pressure supply line for all solenoid-controlled nozzles or injectors,
- Fig. 2
- in a diagram the synchronous course of the pressure, the delivery and the injection,
- Fig. 3
- in an enlarged representation the pressure curve in the case of a fault-free and leaky system, each in engine operation,
- Fig. 4
- in an enlarged representation the pressure curve in the case of a fault-free and leaky system, in each case in engine operation, but with delivery and injection suspended,
- Fig. 5
- the pressure curve in the event of a leaky system in overrun mode, in which the delivery and injection are switched off.
In Fig. 1 ist eine Kraftstoffeinspritzanlage 1 einer mehrzylindrigen Brennkraftmaschine 2 gezeigt, die im wesentlichen aus einer bedarfsgeregelten Hochdruckpumpe 3 sowie aus einem Einspritzleitungssystem 4 mit einer für alle magnetventilgesteuerten Düsen bzw. Injektoren 5,6,7,8 vorgesehenen gemeinsamen Hochdruckversorgungsleitung 9 besteht.In Fig. 1, a fuel injection system 1 of a multi-cylinder
Ein mit 10 bezeichneter Drucksensor mißt den Ist-Druck in der Hochdruckversorgungsleitung 9. Abweichungen vom Soll-Druck in dem jeweiligen Betriebsbereich werden durch eine elektronische Steuereinheit 11 ausgeglichen, indem ein angesteuertes Verstellorgan 12 an der Hochdruckpumpe 3 den vorgegebenen Druck einregelt.A pressure sensor denoted by 10 measures the actual pressure in the high-
Der Drucksensor 10 dient nicht allein zur Regulierung des Hochdruckregelkreises für die Einhaltung eines bestimmten Druckniveaus, sondern wird auch zur Ermittlung von Undichtigkeiten im hochdruckseitigen Leitungssystem herangezogen, worauf nachfolgend näher eingegangen ist.The
In Fig. 2 sind phasensynchrone Verläufe a,b,c hinsichtlich des Raildrucks, der Förderung und der Einspritzung aufgetragen. Die dargestellten Verläufe ergeben sich im normalen, also störungsfreien Betrieb der Brennkraftmaschine. Im einzelnen bedeuten
- FB
- = Förderbeginn
- FE
- = Förderende
- EB
- = Einspritzbeginn
- EE
- = Einspritzende
- t1
- = erster Zeitpunkt und
- t2
- = zweiter Zeitpunkt für die Druckmessung (nach Einspritzphase)
- t1'
- = erster Zeitpunkt und
- t2'
- = zweiter Zeitpunkt für die Druckmessung (nach Förderphase)
- F B
- = Start of funding
- F E
- = End of funding
- E B
- = Start of injection
- E E
- = End of injection
- t 1
- = first time and
- t 2
- = second time for pressure measurement (after injection phase)
- t 1 '
- = first time and
- t 2 '
- = second time for pressure measurement (after delivery phase)
Der Drucksensor 10 erfaßt den jeweiligen Druck zum vorgegebenen Zeitpunkt t1 und t2. Beide Zeitpunkte sind zwischen dem Einspritzende EE und dem Förderbeginn FB gewählt. Bei störungsfreiem, also dichtem Leitungssystem ergibt sich ein mit durchgehender Linie in Fig. 3 dargestellter Druckverlauf. Es liegt keine nennenswerte Druckdifferenz zwischen den ermittelten Drücken bei t1 und t2 und gegebenenfalls t3 vor.The
Bei undichtem System ergibt sich ein mit unterbrochener Linie dargestellter Druckverlauf bzw. Druckabfall.In the case of a leaky system, a pressure curve or pressure drop is shown with a broken line.
Wenn die hier ermittelte Druckdifferenz einen definierten Grenzwert überschreitet, wird dieser Zustand als Störung angezeigt.If the pressure difference determined here exceeds a defined limit, this status is displayed as a fault.
Dieses Verfahren, das zum Erkennen von großen Undichtigkeiten eingesetzt werden kann, eignet sich besonders bei Leitungssystemen mit großen Kraftstoff-Volumina zwischen der Hochdruckpumpe und den Injektoren.This method, which can be used to detect large leaks, is particularly suitable for piping systems with large fuel volumes between the high pressure pump and the injectors.
Die Ermittlung des Druckverlaufs ist aber bei kleinen Volumina aufgrund der den Systemdruck stark beeinflussenden Reflexionwellen erschwert.However, the determination of the pressure curve is more difficult for small volumes due to the reflection waves that strongly influence the system pressure.
Für diesen Fall ist ein Verfahren vorgesehen, bei dem im normalen Betrieb der Brennkraftmaschine in unregelmäßigen Abständen eine erzwungene Abschaltung mindestens einer Förderung und mindestens einer Einspritzung erfolgt.For this case, a method is provided in which, during normal operation of the internal combustion engine, at least one delivery and at least one injection are forcedly switched off at irregular intervals.
In Fig. 4 sind die Zeitpunkte t1 und t2, gegebenenfalls weitere Zeitpunkte, zur Erfassung des jeweiligen Drucks sowie der Förder- und Einspritzverlauf bei vorübergehender Abschaltung der Förderung und Einspritzung gezeigt.4 shows the times t 1 and t 2 , possibly further times, for the detection of the respective pressure as well as the delivery and injection course when the delivery and injection are temporarily switched off.
Der Raildruckverlauf ist bei intaktem System und bei undichtem System ähnlich wie derjenige nach Fig. 3.The rail pressure curve for an intact system and for a leaky system is similar to that according to FIG. 3.
Für den Fall, daß im System zwischen der Hochdruckpumpe und den Injektoren kleine Undichtigkeiten auftreten, ist ein Verfahren angewendet, das nur im Schubbetrieb der Brennkraftmaschine zum Tragen kommt. Bei jedem Übergang vom normalen in den Schubbetrieb, erkennbar am Signal eines Fahrpedalgebers, wird zusätzlich zu den in diesem Betriebszustand ohnehin abgeschalteten Injektoren auch die Hochdruckpumpe auf Nullförderung eingestellt.In the event that small leaks occur in the system between the high-pressure pump and the injectors, a method is used which is only in the overrun mode of the internal combustion engine Wear comes. With each transition from normal to overrun, recognizable by the signal from an accelerator pedal sensor, the high-pressure pump is set to zero delivery in addition to the injectors that are already switched off in this operating state.
In Fig. 5 sind die Zeitpunkte t1 und t2 zur Druckerfassung im Schubbetrieb sowie der Druckverlauf bei undichtem System dargestellt.5 shows the times t 1 and t 2 for pressure detection in overrun mode and the pressure curve in the case of a leaky system.
Der Zeitpunkt t1 kann nach dem Übergang in den Schubbetrieb frühestens innerhalb der zweiten Umdrehung der Kurbelwelle für die Ermittlung des Raildrucks ausgewählt werden. Die erste Umdrehung der Kurbelwelle kann dabei zur Beruhigung der Druckschwingungen im System benutzt werden. Der Raildruck wird an mehreren Zeitpunkten gemessen, z.B. innerhalb von zehn Umdrehungen der Kurbelwelle, und aus den Messungen die Druckabfallrate ermittelt, die bei Überschreiten eines bestimmten Grenzwertes als Störung angezeigt wird.The time t 1 can be selected after the transition to overrun at the earliest within the second revolution of the crankshaft for determining the rail pressure. The first revolution of the crankshaft can be used to calm the pressure fluctuations in the system. The rail pressure is measured at several points in time, for example within ten revolutions of the crankshaft, and the pressure drop rate is determined from the measurements, which is displayed as a fault if a certain limit value is exceeded.
Die Zeitpunkte zur Druckerfassung können aber auch auf höherem Druckniveau ausgewählt werden, und zwar zwischen dem Förderende FE und dem Einspritzbeginn EB. Die Zeitpunkte sind mit t1' und t2' bezeichnet und beispielhaft in Fig.2 dargestellt.
Die Festlegung der Zeitpunkte t1' und t2' gilt gleichermaßen für die anderen Ausführungen.The times for pressure detection can also be selected at a higher pressure level, namely between the end of delivery F E and the start of injection E B. The times are denoted by t 1 'and t 2 ' and shown as an example in FIG.
The determination of the times t 1 'and t 2 ' applies equally to the other versions.
Claims (5)
dadurch gekennzeichnet,
daß zwischen dem Ende einer Einspritzung und dem Beginn der Förderung oder zwischen dem Ende einer Förderung und dem Beginn einer Einspritzung der an mindestens zwei vorgegebenen Zeitpunkten (t1;t2 oder t1';t2') jeweils anliegende Druck erfaßt und die ermittelte Druckdifferenz erst bei Überschreiten eines definierten Grenzwertes als Störung angezeigt wird.Method for identifying malfunctions in a fuel injection system, in which fuel is pumped into a pressure supply line by a pressure pump and nozzles are assigned to cylinders of an internal combustion engine for injection,
characterized,
that between the end of an injection and the start of delivery or between the end of delivery and the start of injection, the pressure present at at least two predetermined times (t 1 ; t 2 or t 1 '; t 2 ') is detected and determined Pressure difference is only displayed as a fault when a defined limit value is exceeded.
dadurch gekennzeichnet,
daß im normalen Betrieb der Brennkraftmaschine mindestens eine der nächstfolgenden Einspritzungen und Förderungen für mindestens einen Zylinder abgeschaltet wird und der an mindestens zwei vorgegebenen Zeitpunkten (t1;t2 oder t1';t2') anliegende Druck erfaßt und die ermittelte Druckdifferenz erst bei Überschreiten eines definierten Grenzwertes als Störung angezeigt wird.Method for identifying malfunctions in a fuel injection system, in which fuel is pumped into a pressure supply line by a pressure pump and nozzles are assigned to cylinders of an internal combustion engine for injection,
characterized,
that during normal operation of the internal combustion engine, at least one of the next injections and deliveries for at least one cylinder is switched off and the pressure present at at least two predetermined times (t 1 ; t 2 or t 1 '; t 2 ') is detected and the pressure difference determined only at If a defined limit value is exceeded, a fault is displayed.
dadurch gekennzeichnet,
daß im Schubbetrieb der Brennkraftmaschine bei abgeschalteten Düsen (5-8) und Nullförderung der Hochdruckpumpe (3) der an mindestens zwei vorgegebenen Zeitpunkten (t1;t2 oder t1';t2') jeweils anliegende Druck erfaßt und die ermittelte Druckdifferenz erst bei Überschreiten eines definierten Grenzwertes als Störung angezeigt wird.Method for identifying malfunctions in a fuel injection system, using a pressure pump Fuel is fed into a pressure supply line and cylinders are supplied to nozzles for injection associated with internal combustion engines,
characterized,
that in overrun mode of the internal combustion engine with the nozzles (5-8) switched off and zero delivery of the high-pressure pump (3), the pressure present at at least two predetermined times (t 1 ; t 2 or t 1 '; t 2 ') is detected and the pressure difference determined is displayed as a fault if a defined limit value is exceeded.
dadurch gekennzeichnet,
daß die Zeitpunkte (t1;t2 oder t1';t2') mindestens innerhalb einer Umdrehung der Kurbelwelle, vorzugsweise innerhalb von zehn Umdrehungen erfaßt werden.Method according to claim 3,
characterized,
that the times (t 1 ; t 2 or t 1 '; t 2 ') are recorded at least within one revolution of the crankshaft, preferably within ten revolutions.
dadurch gekennzeichnet,
daß die Zeitpunkte (t1;t2 oder t1';t2') zur Druckerfassung frühestens ab der zweiten Umdrehung der Kurbelwelle nach dem Übergang in den Schubbetrieb gelegt werden.Method according to claim 3 or 4,
characterized,
that the times (t 1 ; t 2 or t 1 '; t 2 ') for pressure detection are set at the earliest from the second revolution of the crankshaft after the transition to overrun mode.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19521791 | 1995-06-15 | ||
| DE19521791A DE19521791A1 (en) | 1995-06-15 | 1995-06-15 | Method for detecting malfunctions in a fuel injection system of an internal combustion engine |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0748930A2 true EP0748930A2 (en) | 1996-12-18 |
| EP0748930A3 EP0748930A3 (en) | 1998-01-14 |
| EP0748930B1 EP0748930B1 (en) | 2000-08-09 |
Family
ID=7764443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96106869A Expired - Lifetime EP0748930B1 (en) | 1995-06-15 | 1996-05-02 | Method for detecting operating failures in a fuel injection apparatus for an internal combustion engine |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5708202A (en) |
| EP (1) | EP0748930B1 (en) |
| DE (2) | DE19521791A1 (en) |
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| EP0907015A3 (en) * | 1997-09-16 | 2002-02-06 | DaimlerChrysler AG | Process for electronic determination of fuel injection related parameters for an internal combustion engine with a Common-rail fuel injection system |
| WO2009000647A2 (en) * | 2007-06-22 | 2008-12-31 | Continental Automotive Gmbh | Method and device for diagnosing an injection valve, connected to a fuel rail, of an internal combustion engine |
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| EP0501459A2 (en) * | 1991-02-27 | 1992-09-02 | Nippondenso Co., Ltd. | Common-rail fuel injection system and related method |
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| WO1995006814A1 (en) * | 1993-09-03 | 1995-03-09 | Robert Bosch Gmbh | Method of diagnosing malfunctioning of the high-pressure circuit of internal combustion engine high-pressure injection systems |
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| GB8403749D0 (en) * | 1984-02-13 | 1984-03-14 | Hartridge Ltd Leslie | Volumetric metering equipment |
| DE3612808A1 (en) * | 1986-04-16 | 1987-10-22 | Bosch Gmbh Robert | ARRANGEMENT FOR DETECTING THE START OF SPRAYING IN A DIESEL INTERNAL COMBUSTION ENGINE |
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| US5020362A (en) * | 1990-06-15 | 1991-06-04 | Hickok Electrical Instrument Company | Fuel injection system tester |
| JPH04350358A (en) * | 1991-05-29 | 1992-12-04 | Mitsubishi Electric Corp | Fuel leak self-diagnostic device for electronically controlled fuel injection type internal combustion engine |
| JPH0699176B2 (en) * | 1991-06-25 | 1994-12-07 | 東洋道路株式会社 | Semi-flexible paving material |
| US5445019A (en) * | 1993-04-19 | 1995-08-29 | Ford Motor Company | Internal combustion engine with on-board diagnostic system for detecting impaired fuel injectors |
| US5492099A (en) * | 1995-01-06 | 1996-02-20 | Caterpillar Inc. | Cylinder fault detection using rail pressure signal |
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1996
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- 1996-05-02 DE DE59605704T patent/DE59605704D1/en not_active Expired - Fee Related
- 1996-06-05 US US08/659,680 patent/US5708202A/en not_active Expired - Fee Related
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| EP0501459A2 (en) * | 1991-02-27 | 1992-09-02 | Nippondenso Co., Ltd. | Common-rail fuel injection system and related method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0857867A1 (en) * | 1997-02-03 | 1998-08-12 | Robert Bosch Gmbh | Method and apparatus for detecting leaks |
| EP0860600A3 (en) * | 1997-02-21 | 2000-03-29 | Toyota Jidosha Kabushiki Kaisha | A fuel injection system for an internal combustion engine |
| FR2766237A1 (en) * | 1997-07-19 | 1999-01-22 | Bosch Gmbh Robert | FUEL SUPPLY SYSTEM FOR AN INTERNAL COMBUSTION ENGINE INCLUDING IN PARTICULAR A MOTOR VEHICLE |
| EP0907015A3 (en) * | 1997-09-16 | 2002-02-06 | DaimlerChrysler AG | Process for electronic determination of fuel injection related parameters for an internal combustion engine with a Common-rail fuel injection system |
| WO2009000647A2 (en) * | 2007-06-22 | 2008-12-31 | Continental Automotive Gmbh | Method and device for diagnosing an injection valve, connected to a fuel rail, of an internal combustion engine |
| WO2009000647A3 (en) * | 2007-06-22 | 2009-02-19 | Continental Automotive Gmbh | Method and device for diagnosing an injection valve, connected to a fuel rail, of an internal combustion engine |
| US8333109B2 (en) | 2007-06-22 | 2012-12-18 | Continental Automotive Gmbh | Method and device for diagnosing an injection valve, connected to a fuel rail, of an internal combustion engine |
| DE102007028900B4 (en) * | 2007-06-22 | 2013-06-27 | Continental Automotive Gmbh | Method and device for diagnosing an injection valve of an internal combustion engine that is in communication with a fuel rail |
| WO2010038126A1 (en) * | 2008-09-30 | 2010-04-08 | Eaton Corporation | Leak detection system |
| JP2012504206A (en) * | 2008-09-30 | 2012-02-16 | イートン コーポレーション | Leak detection system |
| WO2012066044A1 (en) * | 2010-11-16 | 2012-05-24 | Delphi Technologies Holding S.À.R.L. | Method of determining injection parameters for an injector |
| WO2012156185A3 (en) * | 2011-05-16 | 2013-03-14 | Robert Bosch Gmbh | Method for evaluating the functionality of a fuel injection system of an internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19521791A1 (en) | 1996-12-19 |
| EP0748930B1 (en) | 2000-08-09 |
| EP0748930A3 (en) | 1998-01-14 |
| US5708202A (en) | 1998-01-13 |
| DE59605704D1 (en) | 2000-09-14 |
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