EP2694792A1 - Procédé de diagnostic d'un système de suralimentation de moteurs à combustion interne - Google Patents

Procédé de diagnostic d'un système de suralimentation de moteurs à combustion interne

Info

Publication number
EP2694792A1
EP2694792A1 EP12704835.3A EP12704835A EP2694792A1 EP 2694792 A1 EP2694792 A1 EP 2694792A1 EP 12704835 A EP12704835 A EP 12704835A EP 2694792 A1 EP2694792 A1 EP 2694792A1
Authority
EP
European Patent Office
Prior art keywords
charging system
frequency
measurement data
frequency spectrum
determined
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.)
Withdrawn
Application number
EP12704835.3A
Other languages
German (de)
English (en)
Inventor
Uwe Kassner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2694792A1 publication Critical patent/EP2694792A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
    • 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
    • F02D41/0002—Controlling intake air
    • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines
    • G01M15/12—Testing internal-combustion engines by monitoring vibrations
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/28—Interface circuits
    • F02D2041/286—Interface circuits comprising means for signal processing
    • F02D2041/288—Interface circuits comprising means for signal processing for performing a transformation into the frequency domain, e.g. Fourier transformation
    • 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
    • F02D2200/025—Engine noise, e.g. determined by using an acoustic sensor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the invention relates to a method for diagnosing a charging system of internal combustion engines.
  • Charging systems for example, equipped with exhaust gas turbochargers, the energy contained in the exhaust stream to achieve a comparison with the sucking engine operation increased cylinder filling with fresh gas use.
  • the assembly of such charging systems on the internal combustion engine is very complex, since only small spaces are available and gas and suction side of the
  • This method requires the vehicle to be run on a chassis dynamometer over the various operating conditions.
  • Claim 1 has the advantage that by comparing a means
  • Frequency analysis determined frequency characteristic of the charging system for at least one predetermined operating point the charging system with a predetermined vehicle-specific frequency characteristics of the charging system for the at least one predetermined operating point of the charging system a fast and reliable diagnosis of the charging system of the motor vehicle is possible.
  • the method can be used in practice in a simple manner by making it possible to use diagnostic devices present in workshops, which merely have to be supplemented with additional algorithms for exhaust-gas turbocharger diagnosis as a software version. With the acquired measurement data can also determine the speed of several components of the charging system.
  • Frequency characteristic for the given operating point an actual speed of the charging system is determined, and that the determined actual speed is compared with a this operating point characterizing, predetermined vehicle-specific target speed of the charging system of the motor vehicle. Based the comparison of the actual speed of the charging system with the target speed of the
  • Charging system is finally closed on the functioning of the charging system.
  • the diagnosis of the charging system can also be carried out in a simple manner by the measurement data acquisition for detecting the
  • the measurement data evaluation is not limited only to the detection of the rotational speed of the exhaust gas turbocharger, but can also for not included in the comparison signal signal components for detecting damage to the
  • Vehicle manufacturer present by the frequency spectrum searched for other atypical frequencies and is closed from the presence of atypical frequencies to damage the charging system.
  • the amplitudes of the individual discrete frequencies can be compared with limit values.
  • the determined frequency spectrum is subjected to an amplitude evaluation, so that a noise diagnosis of the charging system can be carried out on the basis of the amplitude evaluation.
  • FIG. 1 is a block diagram for carrying out the inventive
  • FIG. 2 shows a signal of an exhaust-gas turbocharger recorded by a sensor
  • FIG. 3 shows a frequency spectrum determined by a frequency analysis
  • FIG. 4 shows a block diagram of a measurement data evaluation.
  • FIG. 1 describes the overall structure of a diagnostic system of a
  • a mobile diagnostic device 1 can be used, which is usually used in workshops for the diagnosis of motor vehicles.
  • Diagnostic devices 1 has at least one display 2 and a data acquisition and evaluation unit 3. Such diagnostic devices 1 are prior art, so that the diagnosis of the exhaust gas turbocharger can be performed with the usual diagnostic device 1.
  • the diagnostic device 1 is only to be supplemented with an additional algorithm for exhaust gas turbocharger diagnosis as a software version.
  • the exhaust gas turbocharger diagnostic system includes at least one sensor for receiving one of the exhaust gas turbochargers upon rotation
  • the diagnostic system according to FIG. 1 has two sensors 4 and 5, which are assigned to an exhaust gas turbocharger 10 of a motor vehicle.
  • Vibration sensor for receiving vibration or a
  • the sensors 4 and 5 are for the diagnosis by means of a universal or vehicle-specific
  • vibration sensors for evaluating the structure - borne noise of the Exhaust gas turbocharger 10 may be an attachment of the sensor z. B. by means of an adhesive film on the housing of the exhaust gas turbocharger.
  • Vibration sensors can piezoelectric transducer or z.
  • micromechanical acceleration sensors as used in the ABS / ESP system. It is advantageous if the vehicle manufacturer, as already for the workshop diagnosis by special tools and
  • the diagnostic system further comprises a data line 6, which is formed by a known diagnostic cable.
  • the data line 6 connects the diagnostic device 1 with an existing motor vehicle engine control unit 7, which in turn is connected via a control line 8 with an actuator 9.
  • the actuator 9 By means of the actuator 9, the exhaust gas turbocharger 10 is controlled in the motor vehicle by the engine control unit 7 dependent on driving condition.
  • the diagnostic procedure for the turbocharger takes place in two steps, namely a measurement data acquisition and a measurement data evaluation.
  • the measurement data acquisition the driver of the motor vehicle, for example, for driving on the road, a driving profile with predetermined operating points A, B specified for the exhaust gas turbocharger 10, such. B. the gear to be engaged and the speed to be traveled.
  • the operating points A, B are specific to the vehicle type and cover certain operating modes of the exhaust gas turbocharger 10.
  • the diagnostic device 1 when performing the driving profile during the measurement data acquisition on the
  • the diagnostic device 1 further informs the driver, for example by means of the display 2, when a sufficient measuring time for the respective operating point has been reached. If all operating points are sufficiently recorded, the measurement data acquisition is completed.
  • the diagnostic device 1 also causes the variable control of the actuator 9 via the engine control 7. From the changing speed of the exhaust gas turbocharger 10, which is determined in the subsequent second step of the measurement data evaluation, can be additionally closed on the functioning of the actuator 6.
  • exhaust gas turbocharger 10 generate speed-proportional sound and vibrations with different frequencies during operation.
  • the resulting frequencies represent harmonic fundamental frequencies, which are detected as a frequency spectrum of the exhaust gas turbocharger 10.
  • the data acquisition and evaluation unit 3 for measuring data evaluation contains per se known means for frequency analysis of the recorded frequency spectrum.
  • Waveform as a function of time, measured with a microphone as
  • Frequency analysis, z. B. by means of a Fourier analysis, the frequency spectrum of Figure 2 evaluated by a frequency characteristic, as shown in Figure 3, for the or the predetermined operating points A, B is determined.
  • the frequency spectrum of FIG. 2 evaluated with the frequency analysis shows in FIG. 3 two typical frequency peaks A ', B', for example at 20 and 60 kHz, which characterize the two predetermined operating points A and B. in the
  • Diagnostic device 1 or in the engine control unit 7 is further a predetermined vehicle-specific frequency characteristic for the predetermined operating points
  • Frequency characteristic in the predetermined operating points A, B is provided for example by the vehicle manufacturer. Subsequently, in a further step, the frequency characteristic determined for the given operating points A, B according to FIG vehicle-specific frequency characteristics in these predetermined
  • Diagnostic device 1 or be executed by the engine control unit 7.
  • step 21 A detailed procedure of the measurement data evaluation is shown in FIG. In step 21, as already mentioned, a frequency analysis of the previously in
  • a frequency evaluation is carried out by the frequency characteristic present for the given operating point A, B with the predetermined vehicle-specific frequency characteristic in the
  • step 23 the present in the operating points A, B actual speed of the exhaust gas turbocharger 10 with the vehicle manufacturer for these operating points A, B predetermined, vehicle-specific setpoint speed of the exhaust gas turbocharger 10 is compared. About the comparison is closed to the state of the exhaust gas turbocharger 10. If there is a deviation between the actual rotational speed and the target rotational speed, the turbocharger 10 does not work correctly.
  • step 25 it is analyzed whether in
  • Exhaust gas turbocharger not noticeably influence (eg damage to individual compressor or turbine blades).
  • step 27 the amplitudes of the individual discrete frequencies are compared with limit values. Based on the comparison of the amplitudes, noises are diagnosed in step 28. By diagnosing noises, customer complaints can become too Noise of the exhaust gas turbocharger 10, which could not be objectively evaluated in the workshop so far objectified.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Supercharger (AREA)
  • Testing Of Engines (AREA)

Abstract

L'invention concerne un procédé de diagnostic d'un système de suralimentation, ledit procédé consistant à détecter au moyen d'une détection de données de mesure le spectre de fréquence généré lors de la rotation du système de suralimentation et à évaluer par une analyse fréquentielle au moyen d'une évaluation de données de mesure le spectre de fréquence détecté. Une caractéristique de fréquence du système de suralimentation obtenue au moyen de l'analyse fréquentielle pour au moins un point de fonctionnement prescrit du système de suralimentation est comparée à une caractéristique de fréquence prescrite spécifique au véhicule du système de suralimentation pour le ou les points de fonctionnement prescrits.
EP12704835.3A 2011-04-08 2012-02-22 Procédé de diagnostic d'un système de suralimentation de moteurs à combustion interne Withdrawn EP2694792A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011007031A DE102011007031A1 (de) 2011-04-08 2011-04-08 Verfahren zur Diagnose eines Aufladesystems von Verbrennungsmotoren
PCT/EP2012/052995 WO2012136407A1 (fr) 2011-04-08 2012-02-22 Procédé de diagnostic d'un système de suralimentation de moteurs à combustion interne

Publications (1)

Publication Number Publication Date
EP2694792A1 true EP2694792A1 (fr) 2014-02-12

Family

ID=45688519

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12704835.3A Withdrawn EP2694792A1 (fr) 2011-04-08 2012-02-22 Procédé de diagnostic d'un système de suralimentation de moteurs à combustion interne

Country Status (5)

Country Link
US (1) US20140107905A1 (fr)
EP (1) EP2694792A1 (fr)
CN (1) CN103443426A (fr)
DE (1) DE102011007031A1 (fr)
WO (1) WO2012136407A1 (fr)

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Also Published As

Publication number Publication date
DE102011007031A1 (de) 2012-10-11
CN103443426A (zh) 2013-12-11
WO2012136407A1 (fr) 2012-10-11
US20140107905A1 (en) 2014-04-17

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