EP1563272A1 - Procede pour detecter des rates de combustion dans un moteur a combustion interne - Google Patents

Procede pour detecter des rates de combustion dans un moteur a combustion interne

Info

Publication number
EP1563272A1
EP1563272A1 EP03773479A EP03773479A EP1563272A1 EP 1563272 A1 EP1563272 A1 EP 1563272A1 EP 03773479 A EP03773479 A EP 03773479A EP 03773479 A EP03773479 A EP 03773479A EP 1563272 A1 EP1563272 A1 EP 1563272A1
Authority
EP
European Patent Office
Prior art keywords
internal combustion
combustion engine
threshold value
parameter
running
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Withdrawn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
EP03773479A
Other languages
German (de)
English (en)
Inventor
Frédéric Galtier
Hong Zhang
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.)
Continental Automotive GmbH
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP1563272A1 publication Critical patent/EP1563272A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G01M15/11—Testing internal-combustion engines by detecting misfire
    • 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
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1012—Engine speed gradient
    • 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
    • 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
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated

Definitions

  • the present invention relates to a method for detecting misfires in an internal combustion engine.
  • the threshold value is defined as a function of the operating point of the internal combustion engine (for example as a function of the speed and load), and it is generally stored once in the operating control device of the internal combustion engine in the form of characteristic diagrams during the calibration of the internal combustion engine. If the characteristic variable continuously determined for the acceleration of the internal combustion engine thus falls below this threshold value, a misfire is detected in the cylinder under consideration.
  • a fundamental difficulty with these detection methods is that it is very difficult in special operating phases of the internal combustion engine to distinguish speed fluctuations caused by combustion misfires from operational speed fluctuations. Operating phases of high speed and lower are particularly affected Load. At high speeds, the time periods to be measured (segment times) are becoming shorter and shorter, so that no threshold value can be defined that is sufficiently far away from the continuously determined speed-dependent parameter to enable error-free detection of combustion misfires.
  • the method according to the invention is based on a conventional misfire detection method, in which a parameter dependent on the acceleration of the internal combustion engine is continuously determined by means of a predetermined monitoring and analysis method when the internal combustion engine is running and is compared with a threshold value.
  • the acceleration-dependent parameter is, for example, an acceleration index, a torque index, a segment time or a similar variable, such as that e.g. are known from the publications mentioned above.
  • any known monitoring and analysis method with a more or less complicated algorithm can be used to determine this parameter, as is also known from the above-mentioned documents.
  • the acceleration-dependent parameter is an image of the
  • Combustion efficiency since it represents a measure of the torque contribution of the individual cylinders generated by the combustion.
  • the scatter or cyclical distribution of this parameter therefore reflects the smooth running of the internal combustion engine.
  • the scatter of the acceleration-dependent parameter is therefore determined and used to adapt the threshold value to changes in the smooth running of the internal combustion engine.
  • the threshold value is increased when the running smoothness becomes smaller and the threshold value is reduced when the running smoothness becomes larger.
  • the threshold value for the misfire detection can be continuously and automatically adapted to changing operating states, which increases the reliability of the misfire detection accordingly.
  • the scattering range for the scattering of the acceleration-dependent parameter can be determined in any way. For example, a predefined period of time or a predefined number of working cycles is used as the scattering range.
  • the method according to the invention increases the safety and accuracy of misfire detection in the entire operating range and during the entire service life of the internal combustion engine.
  • reliable misfire detection is also possible in unfavorable operating phases such as allows when heating the catalyst.
  • Another advantage of the method according to the invention is that it can be used when calibrating the internal combustion engine, so that no separate setting of a threshold value for misfire detection is required. This simplifies the calibration process. All of this is achieved with a minimal amount of computation and memory, which means a corresponding relief of the electronic operating control device.
  • the invention thus makes a contribution to optimizing the operation of the internal combustion engine with regard to fuel consumption and pollutant emissions.
  • the scatter of the parameter dependent on the acceleration of the internal combustion engine is used to check the result of the smooth running control. If, for example, after the smooth running control has been carried out and the threshold value has been adjusted, combustion misfires still occur in one or more cylinders, the checking method according to the invention recognizes the combustion of this cylinder or cylinders as faulty. As a result, the malfunction of the cylinder in question is confirmed or verified. An error message can then be generated.
  • the scatter of the acceleration-dependent parameter is determined in any case in the method according to the invention for adapting the threshold value, the implementation of the described checking method requires only a small additional effort.
  • Fig. 1 is a diagram in which a characteristic value K (acceleration index) of 'the duty cycles Z is plotted an internal combustion engine; 2 shows a flowchart of a method for adapting a threshold value for misfire detection;
  • FIG. 3 shows a flowchart of a method for checking the result of a smooth running control.
  • a parameter dependent on the acceleration of the internal combustion engine is continuously determined by means of a monitoring and analysis method while the internal combustion engine is running and then compared with a predetermined threshold value. 1, such a characteristic variable K is plotted over the working cycles Z of an internal combustion engine.
  • the parameter K in the exemplary embodiment shown is an acceleration index, as is known, for example, from US Pat. No. 5,056,360 mentioned at the beginning.
  • the acceleration index represents a measure of the acceleration of the crankshaft at a specific operating point of the internal combustion engine. If the acceleration mdex falls below the threshold value, this means that the cylinder in question has made no or only an insufficient torque contribution at this operating point, which is generally due to a misfire.
  • segment times are the time periods that the crankshaft needs during the work cycles of the individual cylinders to run through predetermined angular ranges. Since the determination and evaluation of segment times is also known, there is no need to go into this further.
  • the diagram in FIG. 1 shows the course of the parameter K (acceleration index).
  • the parameter K is shown on the left-hand side of the diagram when the internal combustion engine is operating optimally. As can be seen, the parameter K changes only slightly in this operating range.
  • the straight line denoted by S represents a threshold value suitable for this operating range. If the characteristic variable K falls below the threshold value S in this operating range, this indicates a misfiring VA.
  • the characteristic variable K is continuously determined using a conventional misfire detection method (step 1).
  • the scatter of the parameter K i.e. the changes in K, determined within a predetermined range. For example, a predetermined time period or a predetermined number of working cycles Z can be selected as the scattering range. If the scatter remains essentially unchanged, the program goes back to step 1.
  • this change is analyzed in a step 3. In particular, it is checked in which direction and to what extent the scatter of the parameter K has changed.
  • the threshold value S is then increased or decreased (step 4). In the exemplary embodiment shown, this increase or decrease in the threshold value S takes place cyclically and step by step.
  • the threshold value S can be automatically and continuously adapted to the smooth running or rough running of the internal combustion engine over the entire service life of the internal combustion engine. This ensures that error-free misfire detection is possible even under unfavorable operating conditions of the internal combustion engine.
  • a further aspect of the method according to the invention is explained on the basis of the flow diagram of FIG. 3.
  • the method explained with reference to FIG. 2 is used to check a smooth running control of the internal combustion engine.
  • methods for regulating the smooth running of an internal combustion engine are known in the prior art (for example DE 197 41 965 Cl), in which different torque contributions of the individual cylinders are matched to one another by intervention in the ignition and / or fuel injection To improve the smooth running of the internal combustion engine.
  • the method illustrated in the flowchart in FIG. 3 serves to check the result of such a smooth running control.
  • the starting point is again a conventional misfire detection method in which the parameter K is continuously determined (step 5).
  • a conventional smooth running control method is activated in order to improve the smooth running of the internal combustion engine.
  • step 9 it is checked whether the smooth running control has ended. This can be the case, for example, after a predetermined period of time, a predetermined number of working cycles or when predetermined limits have been reached for certain operating parameters.
  • step 10 it is checked whether this threshold value adaptation has ended.
  • misfire detection which is carried out continuously, a check is carried out after the threshold value adaptation has been completed to determine whether combustion misfires are still occurring in one (or more) cylinders (step 11). If there are no more misfires, the program returns to the starting point. If, however, it appears that combustion misfires still occur in one (or more) cylinders, this is a sign that the combustion in the cylinder in question is disturbed due to a permanent malfunction. The misfire detection is then confirmed (step 12) and a corresponding entry is made in the operating control (step 13).
  • the described method thus enables greater certainty in the detection of a real malfunction with regard to the combustion in one or more cylinders.

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)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

Dans l'état de la technique, un paramètre (K) qui dépend de l'accélération du moteur à combustion interne est déterminé au moyen d'un procédé de surveillance et d'analyse et comparé à une valeur seuil (S). Selon le procédé de l'invention, la variation de ce paramètre (K) qui dépend de l'accélération est utilisée pour adapter la valeur seuil aux changements de stabilité de fonctionnement du moteur à combustion interne.
EP03773479A 2002-11-21 2003-10-01 Procede pour detecter des rates de combustion dans un moteur a combustion interne Withdrawn EP1563272A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10254479A DE10254479B4 (de) 2002-11-21 2002-11-21 Verfahren zum Erkennen von Verbrennungsaussetzern in einer Brennkraftmaschine
DE10254479 2002-11-21
PCT/DE2003/003273 WO2004046678A1 (fr) 2002-11-21 2003-10-01 Procede pour detecter des rates de combustion dans un moteur a combustion interne

Publications (1)

Publication Number Publication Date
EP1563272A1 true EP1563272A1 (fr) 2005-08-17

Family

ID=32308646

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03773479A Withdrawn EP1563272A1 (fr) 2002-11-21 2003-10-01 Procede pour detecter des rates de combustion dans un moteur a combustion interne

Country Status (4)

Country Link
US (1) US7359793B2 (fr)
EP (1) EP1563272A1 (fr)
DE (1) DE10254479B4 (fr)
WO (1) WO2004046678A1 (fr)

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DE102006016484A1 (de) * 2006-04-07 2007-10-11 Daimlerchrysler Ag Verfahren zum Betrieb einer Brennkraftmaschine
JP4626564B2 (ja) * 2006-05-10 2011-02-09 株式会社デンソー 内燃機関の制御装置
FR2902829B1 (fr) * 2006-06-21 2013-01-04 Siemens Vdo Automotive Procede de detection de rate d'allumage et dispositif correspondant
JP4656169B2 (ja) * 2008-03-11 2011-03-23 日産自動車株式会社 エンジンの失火診断装置及び失火診断方法
FR2938017B1 (fr) * 2008-11-06 2013-03-29 Inst Francais Du Petrole Procede de controle de la combustion d'un moteur fonctionnant en mode stratifie
US8027782B2 (en) * 2009-09-16 2011-09-27 GM Global Technology Operations LLC Pattern recognition for random misfire
EP2690271A4 (fr) * 2011-03-24 2014-12-10 Honda Motor Co Ltd Procédé et appareil de diagnostic de panne de moteur
BR112013030294B1 (pt) * 2011-07-11 2020-12-15 Toyota Jidosha Kabushiki Kaisha Aparelho de controle para motor de combustão interna
US9494090B2 (en) 2013-03-07 2016-11-15 GM Global Technology Operations LLC System and method for controlling an engine in a bi-fuel vehicle to prevent damage to a catalyst due to engine misfire
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US9457789B2 (en) 2014-05-13 2016-10-04 GM Global Technology Operations LLC System and method for controlling a multi-fuel engine to reduce engine pumping losses
DE102017128183A1 (de) 2017-11-28 2019-05-29 Bdr Thermea Group B.V. Verfahren zur Steuerung einer Brennkraftmaschine in einem Blockheizkraftwerk und Vorrichtung zur Erfassung von Betriebsparametern einer Brennkraftmaschine in einem Blockheizkraftwerk

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Also Published As

Publication number Publication date
DE10254479B4 (de) 2004-10-28
WO2004046678A1 (fr) 2004-06-03
US7359793B2 (en) 2008-04-15
US20060089782A1 (en) 2006-04-27
DE10254479A1 (de) 2004-06-09

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