EP1226355B1 - Method and device for the diagnosis of a fuel supply system - Google Patents

Method and device for the diagnosis of a fuel supply system Download PDF

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Publication number
EP1226355B1
EP1226355B1 EP00984821A EP00984821A EP1226355B1 EP 1226355 B1 EP1226355 B1 EP 1226355B1 EP 00984821 A EP00984821 A EP 00984821A EP 00984821 A EP00984821 A EP 00984821A EP 1226355 B1 EP1226355 B1 EP 1226355B1
Authority
EP
European Patent Office
Prior art keywords
fuel
supply system
fuel supply
frequency spectrum
frequency
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.)
Expired - Fee Related
Application number
EP00984821A
Other languages
German (de)
French (fr)
Other versions
EP1226355A1 (en
Inventor
Hansjoerg Bochum
Thomas Frenz
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
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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
Priority to DE19950222A priority Critical patent/DE19950222A1/en
Priority to DE19950222 priority
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to PCT/DE2000/003531 priority patent/WO2001029411A1/en
Publication of EP1226355A1 publication Critical patent/EP1226355A1/en
Application granted granted Critical
Publication of EP1226355B1 publication Critical patent/EP1226355B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/22Safety or indicating devices for abnormal conditions
    • F02D41/221Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/30Controlling fuel injection
    • F02D41/38Controlling fuel injection of the high pressure type
    • F02D41/3809Common rail control systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M65/00Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/14Introducing closed-loop corrections
    • F02D41/1401Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1413Controller structures or design
    • F02D2041/1432Controller structures or design the system including a filter, e.g. a low pass or high pass filter
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/14Introducing closed-loop corrections
    • F02D41/1401Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1433Introducing closed-loop corrections characterised by the control or regulation method using a model or simulation of the system
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/22Safety or indicating devices for abnormal conditions
    • F02D2041/224Diagnosis of the fuel system
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/24Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/28Interface circuits
    • F02D2041/286Interface circuits comprising means for signal processing
    • F02D2041/288Interface circuits comprising means for signal processing for performing a transformation into the frequency domain, e.g. Fourier transformation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D2200/00Input parameters for engine control
    • F02D2200/02Input parameters for engine control the parameters being related to the engine
    • F02D2200/06Fuel or fuel supply system parameters
    • F02D2200/0602Fuel pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D2200/00Input parameters for engine control
    • F02D2200/02Input parameters for engine control the parameters being related to the engine
    • F02D2200/06Fuel or fuel supply system parameters
    • F02D2200/0602Fuel pressure
    • F02D2200/0604Estimation of fuel pressure

Abstract

The invention relates to a method and a device for the diagnosis of a fuel supply system pertaining to an internal combustion engine. The aim of the invention is to enable differentiation of an error with regard to the individual components of the fuel supply system. The invention provides a method which is characterised by the following steps: detecting the course of the fuel pressure in the fuel supply system (2), producing the frequency spectrum of the fuel pressure course (3) and analysing the frequency spectrum (4, 5). The analysis of the frequency spectrum preferably comprises the following steps: comparing the course of the detected frequency spectrum to the course of the frequency spectrum of a flawlessly working fuel supply system in this operating point and classifying the deviations according to the kind of error in the fuel supply system by which said errors were produced, when there are deviations between the courses of the frequency spectrums.

Description

State of the art

The present invention relates to a method for diagnosing a fuel supply system of an internal combustion engine, wherein an n-cylinder fuel pump with a specific basic frequency is arranged in the fuel supply system, comprising the following steps:

  • Recording the course of the fuel pressure in the fuel supply system;
  • Forming the frequency spectrum of the fuel pressure waveform;
  • Comparison of the course of the recorded frequency spectrum with the course of the frequency spectrum of a faultless fuel supply system; and
  • if there are deviations between the traces of the frequency spectra, classifying the deviations according to the nature of the faults in the fueling system causing them. The invention also relates to a device for diagnosing a fuel supply system of an internal combustion engine, wherein in the fuel supply system, an n-cylinder fuel pump is arranged with a certain fundamental frequency, with
  • Means for recording the progress of the fuel pressure in the fuel supply system;
  • Means for forming the frequency spectrum of the fuel pressure waveform;
  • Means for comparing the course of the recorded Frequenzsprektrums with the course of the frequency spectrum of an error-free operating fuel supply system; and
  • if there are deviations between the traces of the frequency spectra, means for classifying the deviations according to the nature of the faults in the fueling system causing them.

A fuel supply system of an internal combustion engine serves to fuel the engine from a Supply fuel tank. The fuel is here from a fuel pump from the fuel tank a pressure line to one of the internal combustion engine located fuel rail with injectors pumped. At the fuel rail or elsewhere in the fuel supply system is usually a Pressure sensor arranged. By the pressure sensor is the Fuel pressure measured in the fuel supply system and forwarded to a scheme. The regulation holds the Pressure in the fuel supply system, in particular in the fuel rail, to a predetermined value. The Not required by the internal combustion engine amount of fuel is usually from the fuel rail over a Return line led back into the fuel tank.

The fuel supply system may be referred to as a high pressure fuel delivery system, in particular as a common rail accumulator injection system for a direct injection Internal combustion engine, be formed in the one High-pressure fuel storage as fuel distributor is provided. In common-rail storage injection systems Fuel is removed from the fuel tank by a Electric fuel pump trained prefeed pump initially fed to a downstream high-pressure pump. The High-pressure pump then delivers the fuel with a very high pressure in the high-pressure fuel storage, from where from he about the trained as injectors Injectors in a combustion chamber of the internal combustion engine ' arrives. In the high-pressure fuel storage are Pressure sensors arranged to control the fuel pressure in the High-pressure fuel storage for the regulation of To measure fuel pressure. Such Fuel supply system is, for example, from the DE 195 39 885 A1.

From US 5,499,538 is a method for diagnosing a Fuel supply system of an internal combustion engine, in particular for diagnosing the malfunction of a Fuel pump of a fuel supply system, the known type. The course of the Fuel pressure in the fuel supply system recorded and through a Fast Fourier transformation (FFT) the frequency spectrum of the fuel pressure curve educated. For diagnosis, a resonance frequency of the Fuel supply system and a resonance frequency of Fuel pump of the recorded frequency spectrum in terms of frequency and amplitude with the Frequency spectrum of a faultless working Fuel supply system compared.

From the prior art it is known from a Control deviation of the control of the fuel pressure in the Fuel supply system in general an error of the Derive fuel supply system. A differentiated diagnosis of the error on individual Components of the fuel supply system is not possible. However, it would be desirable, especially one Defective fuel pump of fuel supply system to be able to diagnose. A defective fuel pump can cause the required fuel pressure in the fuel supply system can not be achieved it can be us in certain operating points of the Internal combustion engine to exhaust gas relevant and performance-relevant errors in the mixture formation comes.

Therefore, it is the object of the present invention, at a diagnosis of a fuel supply system of a Internal combustion engine within a short time a reliable and differentiated diagnosis of a fault of the Fuel supply system to enable.

To solve this problem, the invention proposes starting from the method for diagnosing a Fuel supply system of the type mentioned suggest that when the amplitude of the Frequency component of the n-times the fundamental frequency of Fuel pump the deviation than from a fault of the Fuel pump is called, where n the number of cylinders of the fuel pump corresponds.

The course of the fuel pressure in the Fuel supply system can, for example, on the basis of a physical model of the fuel supply system be determined. This will be the physical model State variables of the fuel supply system and / or supplied to the internal combustion engine, from which the course of the Fuel pressure is modeled.

Advantageously, the fuel pressure in the Fuel supply system, however, by means of a Pressure sensor measured. Such a pressure sensor is usually in the fuel supply system for Detecting the fuel pressure for a control of Fuel pressure in the fuel supply system already available and can also be used to hold the Fuel pressure curve according to the present invention be used.

For diagnosis, the frequency spectrum of the Fuel pressure curve formed. The frequency spectrum is advantageously by means of a Fourier transformation of the Fuel pressure curve formed. By the way of working the fuel pump in the fuel supply system it comes to a characteristic frequency spectrum of the Fuel pressure curve. For a differentiated diagnosis a failure of the fuel supply system is the Frequency spectrum analyzed.

Specifically, the frequency spectrum of the Fuel pressure curve in a faultless Fuel supply system one for each Fuel supply system characteristic course. Change certain errors of the fuel supply system the characteristic course of the frequency spectrum in a certain way. As part of the analysis of Frequency spectrum is trying these changes of the to recognize characteristic course and from the To close changes on the causative error. To recognize the changes of the characteristic Gradually, the frequency spectrum is, for example, with Thresholds compared. An increase or a fall The amplitude of the frequency spectrum can by a Comparison with corresponding amplitude thresholds be recognized. Similarly, a move of characteristic frequency components towards higher or lower frequencies by comparing with corresponding frequency thresholds are detected. The Linking a certain change in the characteristic course of the frequency spectrum with the causing error can, for example, by means of a Expert system. With the invention Procedure is thus a differentiated diagnosis of a Fault of the fuel supply system possible.

The analysis of the frequency spectrum includes the following steps:

  • Comparison of the course of the recorded frequency spectrum with the course of the frequency spectrum of a faultless fuel supply system; and
  • if there are deviations between the traces of the frequency spectra, classifying the deviations according to the nature of the faults in the fueling system causing them.

Change certain errors of the fuel supply system the characteristic course of the frequency spectrum of the Fuel pressure curve in a defined manner. So can in particular a failure of the fuel pump of Fuel supply system and multi-cylinder Fuel pumps fail in one of the pump cylinders the course of the recorded frequency spectrum be diagnosed. The course of the recorded Frequency spectrum is preferably with the course of the Frequency spectrum of a fault-free at this operating point working fuel supply system compared.

According to the present invention is in a Fuel supply system in which an n-cylinder fuel pump with a certain fundamental frequency is arranged, with a decrease in the amplitude of the Frequency component of the n-times the fundamental frequency of Fuel pump the deviation than from a fault of the Fuel pump caused classified. In an n-cylinder fuel pump, in particular in an n-cylinder high-pressure pump a common rail storage injection system a direct injection Internal combustion engine, arise during operation of the Fuel pump pressure pulsations with n times Fundamental frequency of a work cycle. By taking the History of the fuel pressure and forming the Frequency spectrum of the fuel pressure curve is in the Course of the frequency spectrum clearly a frequency component at n times the fundamental frequency of the fuel pump detect. If the amplitude of the frequency component of the n-times Base frequency of the fuel pump drops, this is a sure sign of the existence of an error Fuel pump. By an evaluation of the Frequency spectrum at n times the fundamental frequency of Fuel pump can thus have a differentiated diagnosis of Failures of the fuel supply system to the effect be done that between mistakes of the Fuel pump and other errors of the A fuel supply system is distinguished.

According to an advantageous embodiment of the present The invention is prior to classifying the deviations the nature of the error the relevance of the deviations assessed. Slight deviations of the characteristic Course of the frequency spectrum, which is the cause in Temperature fluctuations or tolerances of Fuel supply system may have so remain unconsidered. Only such deviations as be judged significantly in the diagnosis of the Fuel supply system considered.

According to a preferred embodiment of the present invention Invention is proposed that with an increase in the Amplitude of the frequency component of the 1-fold fundamental frequency the fuel pump's deviation than from a fault one of the pump cylinder of the fuel pump caused is classified. In the characteristic course of the Frequency spectrum of a faultless working Fuel supply system is at the fundamental frequency of Fuel pump only a frequency share with a to recognize relatively low amplitude. In addition to a decrease in the amplitude of the frequency component at n times Fundamental frequency of the fuel pump the frequency component at the fundamental frequency of the fuel pump increases is This is a sure sign that a mistake is one of Pump cylinder of the fuel pump is present.

Advantageously, the decrease or increase in the amplitude of the frequency component is determined by means of amplitude thresholds which are undershot or exceeded. The amplitude thresholds are usually dependent on the load and the speed of the fuel pump of the fuel supply system, ie the analysis of the frequency spectrum should be performed both load- and speed-dependent. In order to avoid a DC component in the recorded frequency spectrum, it is proposed according to another preferred embodiment of the present invention that before the analysis of the frequency spectrum the mean value of the recorded fuel pressure be subtracted:

  • As a further solution to the object of the present invention is proposed starting from the device for diagnosing a fuel supply system of the type mentioned that the means for classifying the deviations in a decrease in the amplitude of the frequency component of the n-times the fundamental frequency of the fuel pump, the deviation as from an error classified as fuel pump, wherein n corresponds to the number of cylinders of the fuel pump.
  • A preferred embodiment of the present invention will be explained in more detail below with reference to the drawings. Show it:
    FIG. 1
    a flow diagram of a method according to the invention according to a preferred embodiment;
    FIG. 2
    the course of the recorded fuel pressure;
    FIG. 3
    the course of the frequency spectrum of a faultless fuel supply system; and
    FIG. 4
    the course of the frequency spectrum of a fuel supply system in which a defective fuel pump operates.
  • The present invention relates to a method for Diagnosis of a fuel supply system of a Internal combustion engine. In case of errors of the Fuel supply system allows the invention Method a differentiation of the error to individual Components of the fuel supply system. Especially can with the inventive method an error of Fuel pump of the fuel supply system be diagnosed.

    The fuel supply system in which the inventive method is used is preferably as a common rail accumulator injection system a direct-injection internal combustion engine is formed. Common rail accumulator injection systems become fuel from a fuel tank by an as Electric fuel pump trained prefeed pump initially fed to a downstream high-pressure pump. The High-pressure pump promotes the fuel with a very high pressure in a high-pressure fuel storage, from where from he injectors into a combustion chamber of the Internal combustion engine passes. The of the internal combustion engine Unnecessary fuel quantity usually flows through the high-pressure fuel storage via a return line back into the fuel tank. By doing High-pressure fuel storage is a high-pressure sensor arranged, the fuel pressure in the High-pressure fuel storage measures and one High pressure control feeds the fuel pressure in the High-pressure fuel storage to a predetermined value regulates.

    In a function block 1 in Figure 1 is the inventive method started. First, in a functional block 2 by means of the high pressure sensor of in the fuel high pressure accumulator prevailing fuel pressure measured. The recording of the course of the fuel pressure can be continuous, at regular times or too selected times.

    In a functional block 3, the frequency spectrum of the measured fuel pressure curve formed. The Frequency spectrum is, for example, by means of a Fourier transform formed. Subsequently, the Frequency spectrum analyzed. This is done in one Function block 4, first, the frequency component of n times Basic frequency of the fuel pump with a speed-dependent amplitude threshold compared. Of Furthermore, the frequency component of the fundamental frequency of Fuel pump with another speed-dependent Amplitude threshold compared.

    More specifically, in the present embodiment a diagnosis of a common rail storage injection system performed in which a 3-cylinder high-pressure pump is working. When using the 3-cylinder high-pressure pump arise pressure pulsations with 3 times the fundamental frequency a working game. The pressure pulsations are in the Frequency spectrum of the fuel pressure curve at 3 times Basic frequency of the high pressure pump with a Recognize frequency component with a relatively large amplitude. An error in the high-pressure pump causes a drop the amplitude of this frequency component being detected. Furthermore, an error causes one of the pump cylinders of the High pressure pump in addition to an increase in Amplitude of the frequency component at the fundamental frequency of High pressure feed pump.

    The decrease or increase in the amplitudes of these Frequency components can be determined by amplitude thresholds be determined, which fell below or exceeded become. For this purpose, it is checked in a query block 5, if the Course of the frequency spectrum at 1-fold and 3-fold Basic frequency of the high-pressure pump above or is below a predetermined amplitude threshold. If No, the high-pressure pump is OK (Function block 6) and the inventive method returns back to the function block 1. The dashed line between the function block 6 and the function block 1 should clarify that the method according to the present Embodiment not continuous, but cyclic or triggered.

    If the frequency spectrum recorded Fuel pressure curve has deviations in the 1-fold or at the 3-fold fundamental frequency of High-pressure pump the predetermined amplitude thresholds exceed or fall short, is the High pressure pump defective (function block 7). In one Function block 8 is then set a fault memory.

    FIG. 2 shows the measured course of the fuel pressure in the high-pressure fuel storage over a period of 0.5 seconds. The fuel pressure was at a speed of the internal combustion engine of 2080 U / min measured. The fundamental frequency of the working cycle of the 3-cylinder high-pressure pump of the common rail storage injection system is 17.3 Hz.

    In Figure 3, the frequency spectrum of the measured Fuel pressure curve shown in Figure 2. Clear is the frequency component of the high-pressure pump with 3 times Fundamental frequency (52 Hz) and the frequency component of Injections (4-cylinder engine, 69 Hz) too detect. At the 1-fold fundamental frequency (17.3 Hz) is no to recognize a noticeable frequency component.

    In Figure 4, the frequency spectrum of the measured Fuel pressure at a defective high pressure pump shown. Due to the defective high pressure pump sinks the efficiency of the fuel pump, causing a drop the amplitude of the frequency component at 3 times Fundamental frequency leads. The amplitude is just under 300 (fig 3) dropped to about 120 (Figure 4). Is only a single one Pump cylinder of the high pressure pump defective, the sinks Amplitude of the frequency component of 3 times the fundamental frequency also. In addition, comes to the frequency spectrum Frequency component at 1 times the fundamental frequency of Added high-pressure pump. The amplitude of this Frequency component is from about 20 (Figure 3) to over 100 (Figure 4) increased.

    Claims (8)

    1. Method for the diagnosis of a fuel supply system of an internal combustion engine, wherein an n-cylinder fuel pump with a specific natural frequency is arranged in the fuel supply system, comprising the following steps:
      recording of the profile of the fuel pressure in the fuel supply system (2);
      formation of the frequency spectrum of the fuel pressure profile (3);
      comparison of the profile of the recorded frequency spectrum with the profile of the frequency spectrum of a fuel supply system which operates free of faults; and
      if deviations occur between the profiles of the frequency spectrums, the deviations are classified according to the type of faults in the fuel supply system which cause them,
      characterized in that when the amplitude of the frequency component of the n-multiple natural frequency of the fuel pump drops, the deviation is classified (4) as being caused by a fault in the fuel pump, with n corresponding to the number of cylinders of the fuel pump.
    2. Method according to Claim 1, characterized in that the fuel pressure in the fuel supply system is measured by means of a pressure sensor.
    3. Method according to Claim 1 or 2, characterized in that the severity of the deviations is assessed according to the type of fault before the deviations are classified.
    4. Method according to one of Claims 1 to 3,
      characterized in that the frequency spectrum of the fuel pressure profile is formed by means of a Fourier transformation of the fuel pressure profile.
    5. Method according to one of Claims 1 to 4,
      characterized in that when the amplitude of the frequency component of the 1-multiple natural frequency of the fuel pump increases, the deviation is classified (4) as having been caused by a fault in one of the pump cylinders of the fuel pump.
    6. Method according to one of Claims 1 to 5,
      characterized in that the reduction or the increase in the amplitude of the frequency component is determined by reference to amplitude thresholds which are undershot or overshot (5).
    7. Method according to one of Claims 1 to 6,
      characterized in that before the frequency spectrum is analysed the mean value of the recorded fuel pressure is subtracted.
    8. Device for the diagnosis of a fuel supply system of an internal combustion engine, wherein an n-cylinder fuel pump with a specific natural frequency is arranged in the fuel supply system, having
      means for recording the profile of the fuel pressure in the fuel supply system (2);
      means for forming the frequency spectrum of the fuel pressure profile (3);
      means for comparing the profile of the recorded frequency spectrum with the profile of the frequency spectrum of a fuel supply system which operates free of faults; and
      if deviations occur between the profiles of the frequency spectrums, means for classifying the deviations according to the type of faults in the fuel supply system which cause them,
      characterized in that when the amplitude of the frequency component of the n-multiple natural frequency of the fuel pump drops, the means for classifying the deviations classify the deviation as having been caused by a fault in the fuel pump, with n corresponding to the number of cylinders of the fuel pump.
    EP00984821A 1999-10-19 2000-10-07 Method and device for the diagnosis of a fuel supply system Expired - Fee Related EP1226355B1 (en)

    Priority Applications (3)

    Application Number Priority Date Filing Date Title
    DE19950222A DE19950222A1 (en) 1999-10-19 1999-10-19 Procedure for diagnosis of fuel supply system of IC engine has recording of variation of fuel pressure in system, formation of frequency spectrum of fuel pressure variation and analysis thereof
    DE19950222 1999-10-19
    PCT/DE2000/003531 WO2001029411A1 (en) 1999-10-19 2000-10-07 Method and device for the diagnosis of a fuel supply system

    Publications (2)

    Publication Number Publication Date
    EP1226355A1 EP1226355A1 (en) 2002-07-31
    EP1226355B1 true EP1226355B1 (en) 2005-08-31

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    ID=7926089

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP00984821A Expired - Fee Related EP1226355B1 (en) 1999-10-19 2000-10-07 Method and device for the diagnosis of a fuel supply system

    Country Status (6)

    Country Link
    US (1) US6901791B1 (en)
    EP (1) EP1226355B1 (en)
    JP (1) JP2003512566A (en)
    KR (1) KR100668576B1 (en)
    DE (2) DE19950222A1 (en)
    WO (1) WO2001029411A1 (en)

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    WO2001029411A1 (en) 2001-04-26
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    JP2003512566A (en) 2003-04-02
    DE50011078D1 (en) 2005-10-06
    EP1226355A1 (en) 2002-07-31
    US6901791B1 (en) 2005-06-07

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