WO2010060445A1 - Procédé de détection des ratés de combustion dans un moteur à combustion interne, appareil de commande d'un moteur à combustion interne et moteur à combustion interne - Google Patents

Procédé de détection des ratés de combustion dans un moteur à combustion interne, appareil de commande d'un moteur à combustion interne et moteur à combustion interne Download PDF

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Publication number
WO2010060445A1
WO2010060445A1 PCT/EP2008/010074 EP2008010074W WO2010060445A1 WO 2010060445 A1 WO2010060445 A1 WO 2010060445A1 EP 2008010074 W EP2008010074 W EP 2008010074W WO 2010060445 A1 WO2010060445 A1 WO 2010060445A1
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WO
WIPO (PCT)
Prior art keywords
internal combustion
combustion engine
evaluation unit
cylinder
events
Prior art date
Application number
PCT/EP2008/010074
Other languages
German (de)
English (en)
Inventor
Robbert Josef Henricus Johannes De Bruijn
Original Assignee
Fev Motorentechnik 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 Fev Motorentechnik Gmbh filed Critical Fev Motorentechnik Gmbh
Priority to PCT/EP2008/010074 priority Critical patent/WO2010060445A1/fr
Priority to DE112008004013T priority patent/DE112008004013A5/de
Priority to CN2008801320404A priority patent/CN102224333B/zh
Publication of WO2010060445A1 publication Critical patent/WO2010060445A1/fr

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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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of the engine
    • F02D41/1498—With detection of the mechanical response of the engine measuring engine roughness
    • 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
    • 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
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1015—Engines misfires

Definitions

  • the invention relates to a method for detecting misfires in an internal combustion engine, a control unit for an internal combustion engine and an internal combustion engine.
  • the sender wheel is divided into equal-sized angle segments, which are assigned to the respective cylinders of the internal combustion engine.
  • the sender wheel can, for example, comprise 60-2 or 30-2 teeth via which a subdivision into the angle segments is carried out.
  • the crankshaft performs two full revolutions during a work cycle, for example, in a four-cylinder engine associated with the 60-2 tooth sender wheel, 30 teeth correspond to an angular segment of 180 °, ie 720 ° / cylinder number
  • the two Cylinders are assigned to the total of four cylinders.
  • the measure of the uneven running is determined ignition synchronous on the basis of two consecutive segment times. Dropouts lead to an increase in these firing synchronously determined segment times, since the crankshaft is braked by the misfires.
  • Camshaft and crankshaft-synchronous disturbances lead to a deterioration in the segment time detection and thus to a deterioration in terms of recognition quality.
  • Camshaft synchronous disturbances are caused by torsional vibrations of the crankshaft, which occur primarily at high speeds, and by combustion effects.
  • Crankshaft-synchronous disturbances occur due to encoder wheel tolerances caused by mechanical tolerances of the individual tooth flanks of the encoder wheel and by a mechanical eccentricity of the encoder wheel and associated changes in an air gap between the inductive sensor and the encoder wheel.
  • combustion pressure peaks are detected by means of the knock sensor during HCCI operation, which are similar to the pressure peaks in a knocking combustion. If such a combustion pressure peak generating an output signal at the knock sensor fails, a combustion misfire is closed according to the method.
  • the present invention has for its object to provide an alternative method for detecting misfires in an internal combustion engine of a vehicle, which can preferably rely on existing components of the internal combustion engine.
  • the invention has for its object to provide a control device for an internal combustion engine, in which the inventive method is implemented.
  • the invention has for its object to provide an internal combustion engine with such a control unit.
  • the processing of the signals in the evaluation unit is to be understood as a sequence of events which may include amplification, filtering, rectification, integration and / or digitization of the signals.
  • the signals thus processed are then ready for further processing in the evaluation unit, which is to be understood as meaning a calculation of comparison variables, such as a time and / or an acceleration, by means of calculation algorithms stored in the evaluation unit.
  • the application and / or tilting operations of the piston in the cylinder are to be understood to mean mechanical noise-causing events which occur when the piston passes through a top dead center or a bottom dead center.
  • two successive application and / or tilting operations are used as events for the calculation of a quantity to be referenced.
  • An advantage of the proposed method is that compared to the above-mentioned, the speed fluctuations of a crankshaft evaluating method requires no adaptation with respect to the measuring element to eliminate mechanically induced and related to a combustion process disturbances that corrupt the measured value.
  • the proposed method thus advantageously contributes to a reduction of a computing and memory overhead of the control unit, especially since such an adaptation is known to be very computationally intensive.
  • the proposed method is suitable both for use during HCCI operation of an HCCI internal combustion engine and for use during operation of the HCCI internal combustion engine with spark ignition, especially proposed method is independent of a combustion process.
  • the proposed method is not only suitable for use in operating according to the gasoline engine principle and the HCCI principle internal combustion engines, but also for use in operating on the diesel principle internal combustion engines.
  • the proposed Driving for all types of piston engines which can be operated in addition to a gasoline or a diesel fuel with one of the alternative fuels.
  • Alternative fuels are to be understood as meaning those fuels which can replace conventional fuels produced from mineral oil.
  • Such alternative fuels include, in particular, natural gas, ethanol fuel, biodiesel, biogas, BtI (biomass to liquid) fuel, vegetable oil, hydrogen, wood gas, and the like.
  • burns of a fuel in the cylinder of the internal combustion engine are also detected as structure-borne noise-inducing events by means of the measuring element and converted into the signals.
  • the structure-borne sound waves caused by the individual combustion of the internal combustion engine have a frequency spectrum lying in the kHz range, while the structure-borne sound waves caused in connection with the application and / or tilting operations of the piston of the internal combustion engine Comparable lower frequencies are assigned and are less than or equal to 1 kHz in a frequency range. Therefore, a correspondingly broadband trained measuring member is preferably used to detect both the one and the other structure-borne sound waves can.
  • the signals of the measuring element which correspond to the lower-frequency body sound waves are preferably filtered, either with a corresponding bandpass filter or with a corresponding high-pass filter, in order to ensure a sufficiently high signal quality.
  • Such filtering can be implemented both in terms of software in the control unit and / or hardware technology. While there is no need for additional hardware in the former implementation of the filtering, the latter implementation of the filtering helps to keep the computational effort of the control unit as low as possible.
  • a rotational speed sensor of the internal combustion engine by means of a rotational speed sensor of the internal combustion engine those time ranges are determined in which the said application and / or tilting operations of the piston fall, and these time ranges are subjected to closer inspection.
  • Such a discontinuous procedure in which selected time ranges are considered in more detail in the context of a corresponding measurement window, can be advantageously reduced in connection with the detection of combustion misfires of the computing and storage costs of the control unit.
  • a speed sensor while an inductive sensor is preferably used in conjunction with an associated encoder wheel, which can be arranged on a crankshaft or on a camshaft of the internal combustion engine.
  • a time lying between two successive events is determined and compared with a reference time.
  • the reference time can preferably be stored depending on operating point in a map, such as a function of a load and a speed.
  • these transition regions which correspond to the time ranges described above, the piston in the cylinder undergoes either a top dead center or a bottom dead center.
  • a time difference associated with the compression stroke is determined between two consecutive application and / or tilting operations and then compared with a time difference between two successive application and / or tilting processes associated with the expansion stroke.
  • a comparison with the time difference for the compression stroke comparatively significantly longer time difference for the expansion stroke is thereby closed according to the method of combustion in the cylinder or on a suspension of combustion in the cylinder. Otherwise, there is no evidence of suspension of combustion in the cylinder.
  • a time difference between two successive application and / or tilting operations associated with the expansion stroke of the piston is determined and compared with an operating point-dependent reference time, preferably stored in a characteristic map, in order to conclude a combustion misfire in the cylinder, with a combustion misfire in the cylinder is closed, provided that the time difference related to the expansion stroke exceeds the reference time. Otherwise, this alternative approach will not indicate suspension of combustion in the cylinder.
  • a further acceleration of the piston corresponding to the determined time can be used as another parameter to be referenced, which can be determined approximately indirectly via a force transducer integrated in the piston.
  • the load cell can be designed, for example, as a piezoelectric sensor.
  • a measuring element for detecting structure-borne sound waves is used at a first location and at a second location of the internal combustion engine.
  • the two measuring elements are each assigned to several cylinders.
  • a piezoelectric sensor is used as a measuring element.
  • a knock sensor is preferably used as a measuring element, which may be formed as a piezoelectric sensor.
  • gelungsalgorithmen to extend, on the one hand implement the described method for misfire detection and on the other hand, the above-described software filtering of the signals of the measuring element in the manner of a bandpass or high pass filtering.
  • the proposed method may also advantageously be supplemented with one of the aforementioned methods for detecting misfires or used in parallel with one of these methods in order to ensure useful redundancy with regard to the evaluability of the events associated with combustion ,
  • the known method can advantageously also be switched on only after a detected failure or a recognized malfunction of the measuring device corresponding to the proposed method in order to reduce the computing and storage costs of the control unit as much as possible.
  • the measuring element and the evaluation unit can be used in addition to a speed sensor of the internal combustion engine whose electrical signals are preferably processed and further processed in a separate evaluation unit for detecting misfires.
  • a speed sensor while an inductive sensor is preferably used in conjunction with an associated encoder wheel.
  • the encoder wheel can be arranged on the crankshaft or on the camshaft of the internal combustion engine.
  • the sender wheel is arranged on a flywheel connected to the crankshaft, since such an arrangement of the sender wheel has proved to be useful in practice.
  • the measuring element and the evaluation unit can also be used in addition to spark plugs, which are designed as measuring elements and are used to detect an ion current, which is fed to an associated evaluation unit for processing and further processing.
  • spark plugs which are designed as measuring elements and are used to detect an ion current, which is fed to an associated evaluation unit for processing and further processing.
  • control unit for at least one internal combustion engine
  • the control unit comprises at least one evaluation unit for the processing and further processing of preferably electrical signals generated by means of a measuring element, which correspond to detected, body-sounding events which are associated with an operation of the internal combustion engine.
  • a method for detecting misfires in the internal combustion engine is stored in the evaluation unit, in which signals generated and processed by the measuring element are processed, which correspond to recorded application and / or tilting operations of a piston in a cylinder of the internal combustion engine, which excite structure-borne sound waves.
  • the evaluation unit can be connected to the measuring element for detecting structure-borne sounding events.
  • a method is stored in the evaluation unit, in which signals generated and further processed by the measuring element are processed, which correspond to burns of a fuel in the cylinder of the internal combustion engine, which excite structure-borne sound waves.
  • a first evaluation unit for processing and further processing signals which correspond to events that trigger structure-borne sound, and a second evaluation unit for conditioning and further processing of preferably electrical signals generated by means of a rotational speed sensor, which correspond to rotational speed events ,
  • the first evaluation unit is connectable to the measuring element for detecting the structure-borne sound-exciting events, while the second evaluation unit with the speed sensor for detecting the speed events is connectable.
  • the speed sensor is preferably designed as an inductive transmitter in conjunction with an associated transmitter wheel, which may be arranged on a crankshaft or on a camshaft of the internal combustion engine.
  • the second evaluation unit can also be used for conditioning and further processing of ion streams detected by means of measuring elements, which correspond to burns in the individual cylinders of the internal combustion engine.
  • the measuring members can be designed as spark plugs which serve to detect ion currents.
  • an internal combustion engine with at least one measuring element for detecting structure-borne sound waves exciting events at a point of the internal combustion engine and for implementing the events in preferably e- lectric signals and at least one control unit with at least one evaluation unit for processing and further processing of generated by means of the measuring element signals.
  • a method is stored in the evaluation unit, in which the signals generated by means of the measuring element are processed and further processed, which correspond to detected application and / or tilting operations of a piston in a cylinder of the internal combustion engine, which excite structure-borne sound waves.
  • the evaluation unit is connected to the measuring element.
  • a method is stored in the evaluation unit, in which the signals generated by means of the measuring element are processed and further processed, which correspond to burns of a fuel in the cylinder of the internal combustion engine, which excite structure-borne sound waves.
  • the measuring element is preferably designed as a piezoelectric sensor.
  • the measuring element can furthermore be designed as a knock sensor, which is preferably designed as a piezoelectric sensor.
  • the internal combustion engine comprises a first evaluation unit for processing and further processing of preferably electrical signals generated by means of the measuring element, which correspond to events that trigger structure-borne sound waves, the first evaluation unit being connected to the measuring element, and a second evaluation unit for conditioning and further processing. Processing of generated by means of a speed sensor, preferably electrical signals corresponding to speed events.
  • the internal combustion engine further includes a speed sensor for detecting
  • Speed events which is connected to the second evaluation unit.
  • the speed sensor is preferably used as an inductive transmitter in conjunction with an associated th encoder wheel formed, which can be arranged on a crankshaft or on a camshaft of the internal combustion engine.
  • the second evaluation unit can also be used as an alternative to the treatment and further processing of ion streams, which are detected by means of measuring elements and evaluated for the detection of combustion misfires.
  • the measuring elements are connected to the second evaluation unit.
  • the measuring members are designed as spark plugs, which serve to detect an ion current.
  • 1 is a schematic representation of an arrangement of a control unit and an internal combustion engine
  • FIG. 2 shows a schematic illustration of a preparation of electrical signals generated by means of knock sensors
  • FIG. 3 is a qualitative representation of slideway forces that occur between a piston and a cylinder.
  • Fig. 4 is a schematic representation of a piston movement in a cylinder and Fig. 5 is an excerpt from a measurement.
  • Fig. 1 illustrates schematically a four-cylinder engine 2, to which preferably two knock sensors 6, 8 are mounted, of which the knock sensor 6 the two cylinders 10, 12 and the knock sensor 8 the two cylinders 14, 16 of the motor 2 are assigned.
  • the two knock sensors 6, 8 are connected to a preferably stored in a control unit 5 evaluation unit 4, which has a total of four inputs 18, 20, 22, 24 for knock sensors, of which only the two inputs 18, 22 are occupied.
  • Algorithms for knock control of the engine 2 are stored in the evaluation unit 4, by means of which a cylinder-specific ignition angle change with respect to a normal ignition position of the associated cylinder is determined on the basis of combustion recognized as knocking by means of the two knock sensors 6, 8.
  • the two knock sensors 6, 8 are preferably designed as piezoelectric sensors, which detect in connection with a knocking combustion resulting structure-borne sound waves and convert them into electrical signals.
  • the internal combustion engine 2 corresponding to a number of cylinders 10, 12, 14, 16 of the internal combustion engine 2 are each a knock sensor 6, 8, wherein the individual knock sensors may be formed as piezoelectric sensors.
  • FIG. 2 illustrates a basic evaluation of knock sensor signals from a total of four knock sensors 26, 28, 30, 32 connected to an evaluation unit 7.
  • a multiplexer 36 is used to select which knock sensor input is evaluated.
  • the knock sensor signals then pass through an amplifier 38, a bandpass filter 40, a rectifier 42, an integrator 44, and finally an A / D converter 46 before passing through the knock control algorithms of the motor 2.
  • the application and / or tilting operations of the piston 60 in the cylinder 62 are understood to mean mechanical noise-causing events which occur when the piston 60 passes through a top dead center OT or a bottom dead center UT.
  • two consecutive mooring and / or tilting operations are used as events for determining a time between the events, which is used as a comparison parameter for detecting a combustion misfire.
  • Fig. 4 such an application and tilting is qualitatively represented, which occurs by the piston 60 passes through the top dead center OT.
  • FIG. 3 qualitatively illustrates a course 50 of a supporting force or sliding track force of a piston 48 in a cylinder 49, 51 using the example of a 4-cycle working cycle. It can be seen from the force curve 50 that the piston 48 repeatedly changes its contact side 49, 51 in the course of the working cycle.
  • the highest lateral force occurs during an expansion stroke 56 shortly after passing through a top dead center OT.
  • the system change of the piston 48 described by FIG. 3 from the "counter-pressure side” 51 to the "pressure side” 49 and in particular the violent contact change of the piston 48 in the region of the top dead center OT during the transition from a compression stroke 54 to the expansion stroke 56 leads to mechanical Noise and increased wear of the piston 48, the associated piston rings and the associated tread 49, 51.
  • the Fig. 3 in addition to the course of the lateral force for the expansion stroke 56 and to an intake stroke 52, the compression stroke 54 and a Ausschiebehub 58 belonging Qualitatively refer to lateral force courses.
  • the bolt 64 shown in FIG. 4 arranged between the piston 60 and the connecting rod 66 is arranged offset relative to the piston axis 68.
  • the time ranges are angular ranges of the sensor wheel, which is preferably arranged on a crankshaft, the angular ranges corresponding to the time ranges.
  • the angle ranges can describe a range of ⁇ 10 °, preferably ⁇ 5 ° crankshaft relative to the top dead center OT and the bottom dead center UT of the associated piston.
  • a transition region from an intake stroke 52 to the compression stroke 54 of the piston 60, a transition region from the compression stroke 54 to the expansion onshub 56 of the piston 60 and a transition region from the expansion stroke 56 to a Ausschiebehub 58 of the piston 60 considered and used to evaluate the signals.
  • the piston 60 in the cylinder 62 undergoes either a top dead center OT or a bottom dead center UT.
  • a time difference ⁇ t KH associated with the compression stroke 54 is determined between two consecutive application and / or tilting operations and compared with a time difference ⁇ t EH associated with the expansion stroke 56 between two consecutive application and / or tilting operations in order to detect a combustion misfire in the respective one Close the cylinder. If, after the comparison, a significantly longer time difference ⁇ t EH for the expansion stroke 56 than the time difference ⁇ t " H for the compression stroke 54 results, it is possible to conclude that combustion has not taken place in the respective cylinder. Otherwise, no suspension of combustion is concluded.
  • the reference time t r ⁇ f can be stored in the map about as a function of a load and a speed. If it results from the comparison that the time difference ⁇ t EH related to the expansion stroke 56 exceeds the reference time tref, then a combustion misfire in the assigned cylinder is concluded.
  • the determined time difference .DELTA.t EH corresponds to an acceleration of the piston 48, 60 and thus to an acceleration of an associated crankshaft 70, 72, which is due to the respective combustion process. Dropouts lead to an increase of these determined and related to the expansion stroke 56 time differences .DELTA.t EH , since the crankshaft is decelerated by the misfires.
  • the existing knock sensors 6, 8 are preferably broadband knock sensors which record a frequency spectrum of, for example, 3 kHz to more than 30 kHz and which be able to ensure a high signal quality with respect to the structure-borne sound waves caused by knocking burns, with their natural resonance is above 30 kHz.
  • the structure-borne sound waves caused by the application and / or tilting processes are comparatively low-frequency and have frequencies less than or equal to 1 kHz.
  • the electrical signals generated in this connection by means of the knock sensors 6, 8 are preferably band-pass filtered.
  • the signals of the knock sensors can also be high-pass filtered.
  • Such filtering can be implemented both in terms of software in the control unit 5 and / or hardware technology. While there is no need for additional hardware in the software implementation of the filtering, the hardware implementation of the filtering helps to keep the computational effort of the control unit 5 as low as possible.
  • a tilt and apply event are graphically qualitatively illustrated which occur as the piston passes through top dead center OT.
  • transition regions described above, in which the application and / or tilting processes are caused are preferably detected by a software-implemented measuring window.
  • the computing and storage costs of the control unit 5 are advantageously kept as low as possible.
  • the knock sensors 6, 8 and the evaluation unit 4 are used in addition to acting as a speed sensor Induktivgeber in conjunction with the associated encoder wheel, the electrical signal is processed in a separate evaluation and further processed.
  • a speed sensor Induktivgeber in conjunction with the associated encoder wheel
  • the electrical signal is processed in a separate evaluation and further processed.
  • DE 196 22 448 A1 from which a method is known, evaluated in the speed fluctuations of a crankshaft of an internal combustion engine by means of a Induktivgebers in conjunction with a sensor wheel, which is arranged for example on the crankshaft and in which an individual cylinder of the internal combustion engine-related measure of a rough running of the internal combustion engine is formed and compared with an operating point-dependent reference value to close on combustion misfires in the internal combustion engine.
  • control unit 5 In addition to a first evaluation unit 4 for conditioning and further processing of signals which correspond to events that trigger structure-borne sound, the control unit 5 also comprises a second evaluation unit (not shown) for processing and further processing the electrical signals generated by the inductive transmitter in conjunction with the assigned transmitter wheel. which correspond to speed events.
  • the first evaluation unit 4 is connected to the two knock sensors 6, 8 for detecting the structure-borne sound-exciting events, while the second evaluation unit is connected to the inductive sensor.
  • FIG. 5 illustrates the characteristic piston movement previously described with reference to FIG. 4, by way of example for a four-cylinder in-line engine.
  • FIG. 5 comprises three diagrams I, II, III which have an abscissa in common, the abscissa indicating the unit [1/10 0 KW].
  • the abscissa illustrates a working cycle of the four-cylinder in-line engine, which corresponds to two crankshaft revolutions or a crankshaft angle of 72O 0 KW.
  • the 720 ° KW describing the working cycle correspond to the value of 7200, which multiplied by 1/10 0 KW in turn gives the value of 720 0 KW.
  • a profile of a dimensionless knock sensor signal 74 is shown, which has been detected by means of a knock sensor arranged at a location of the four-cylinder in-line engine.
  • the knock sensor signal 74 has in each case an increase in amplitude with respect to a plurality of successive top dead centers OT, which indicates an application and / or tilting operation 72 of a piston in an associated cylinder.
  • the sequence of illustrated successive top dead centers OT corresponds to a firing order of the individual cylinders of the four-cylinder in-line engine, the firing order corresponding to the cylinder sequence 1 3 4 2.
  • Characteristic of such a four-cylinder in-line engine is that at the respective times at which the indicated top dead centers OT are traversed by the respectively associated piston, in each case also passes through a bottom dead center UT, which corresponds to the respective cylinder in the firing order. Accordingly, if, for example, the piston in the cylinder 3 passes through its top dead center OT, the piston of the cylinder 4 simultaneously undergoes its bottom dead center UT taking into account the aforementioned cylinder sequence 1 3 4 2.
  • a cylinder pressure signal 76 of one of the four cylinders in the unit [bar] is shown, wherein the cylinder pressure signal 76 has been detected by means of a pressure sensor having a spark plug.
  • the pressure signals belonging to the other three cylinders are hidden for simplicity and clarity.
  • Chart I there is the in the diagram Il apparent pressure plateau at about 40 bar a, at a pressure increase follows up to about 90 bar, wherein the pressure rise illustrates the running in the cylinder combustion.
  • the markings M facilitate the assignment of the diagrams I, II, III to one another and at the same time illustrate the said top dead centers OT.
  • intake and exhaust control characteristics 78 of a camshaft are shown, in an order corresponding to the firing order of the four-cylinder in-line engine. Furthermore, in the lower diagram III, a point 80 is indicated at which an exhaust valve associated with a cylinder closes as expected.
  • the cylinder pressure signal 76 shown in the middle diagram II also belongs to this cylinder.
  • the point 80 represents a point in time at which an engine control expects the respective exhaust valve to close, taking into account a corresponding valve clearance. In each case, an inlet control curve 78a and an associated outlet control curve 78b partially overlap.
  • a software-technically implemented measuring window of about ⁇ 10 ° KW relative to top dead center TDC or a point in time is used for detecting the signal tip corresponding to the application and / or tilting process, to which the application and / or Tilting is expected.
  • the upper diagram I further illustrates a time difference ⁇ t KH associated with the compression stroke KH between two consecutive application and / or tilting operations and a time difference ⁇ t EH associated with the expansion stroke EH between two consecutive application and / or tilting operations, which are preferably one with the other are compared to close a misfire in the respective cylinder, wherein a misfire in the cylinder is closed, if the determined time difference .DELTA.t EH is comparatively significantly longer than the time difference .DELTA.t KH .
  • the time difference .DELTA.t EH can also be with a stored vorzugs Stamm- a a map, operating point-dependent reference time t ref are compared in order to infer a misfire in the cylinder, is closed on a combustion misfire in the cylinder, if the time difference .DELTA.t E H exceeds the reference time t ref .
  • time difference .DELTA.t EH can also be compared with a reference time, which can be obtained from an average of all cylinder-related time differences .DELTA.t E m over a certain period or over a certain number of cycles.

Abstract

La présente invention concerne un procédé de détection des ratés de combustion dans un moteur à combustion interne (2). Selon le procédé, à au moins un emplacement du moteur à combustion interne (2), on détecte au moyen d'un élément de mesure (6) des événements qui induisent des ondes acoustiques de structure et qui sont produits lors du fonctionnement du moteur à combustion interne (2) et on les convertit en signaux. Les signaux sont amenés à une unité d'analyse (4), d'un appareil de commande (5) de préférence, en vue de la préparation et du traitement ultérieur. A cette occasion, au moyen de l'élément de mesure (6), on détecte les processus d'appui et/ou de basculement d'un piston (60) dans un cylindre (62) du moteur à combustion interne (2) sous la forme d'événements qui induisent des ondes acoustiques de structure et on les convertit en signaux. L'invention concerne en outre un appareil de commande (5) pour un moteur à combustion interne (2) et un moteur à combustion interne (2).
PCT/EP2008/010074 2008-11-27 2008-11-27 Procédé de détection des ratés de combustion dans un moteur à combustion interne, appareil de commande d'un moteur à combustion interne et moteur à combustion interne WO2010060445A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/EP2008/010074 WO2010060445A1 (fr) 2008-11-27 2008-11-27 Procédé de détection des ratés de combustion dans un moteur à combustion interne, appareil de commande d'un moteur à combustion interne et moteur à combustion interne
DE112008004013T DE112008004013A5 (de) 2008-11-27 2008-11-27 Verfahren zur Erkennung von Verbrennungsaussetzern in einer Verbrennungskraftmaschine, Steuergerät für eine Verbrennungskraftmaschine und Verbrennungskraftmaschine
CN2008801320404A CN102224333B (zh) 2008-11-27 2008-11-27 内燃机中燃烧中断的识别方法、内燃机控制装置和内燃机

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PCT/EP2008/010074 WO2010060445A1 (fr) 2008-11-27 2008-11-27 Procédé de détection des ratés de combustion dans un moteur à combustion interne, appareil de commande d'un moteur à combustion interne et moteur à combustion interne

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DE (1) DE112008004013A5 (fr)
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EP3067538A1 (fr) * 2015-03-11 2016-09-14 General Electric Company Systèmes et procédés pour distinguer le cognement d'un moteur à partir de flux de piston
US20160370255A1 (en) * 2015-06-16 2016-12-22 GM Global Technology Operations LLC System and method for detecting engine events with an acoustic sensor
IT201600083426A1 (it) * 2016-08-08 2018-02-08 Magneti Marelli Spa Metodo per riconoscere l'insorgere di fenomeni di mancata combustione (misfire) nei cilindri di un motore a combustione interna

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