WO2009043737A1 - Procédé de détermination des propriétés dynamiques d'un capteur de gaz d'échappement d'un moteur à combustion interne - Google Patents

Procédé de détermination des propriétés dynamiques d'un capteur de gaz d'échappement d'un moteur à combustion interne Download PDF

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Publication number
WO2009043737A1
WO2009043737A1 PCT/EP2008/062520 EP2008062520W WO2009043737A1 WO 2009043737 A1 WO2009043737 A1 WO 2009043737A1 EP 2008062520 W EP2008062520 W EP 2008062520W WO 2009043737 A1 WO2009043737 A1 WO 2009043737A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
cylinders
evaluation criterion
dynamics
sensor
Prior art date
Application number
PCT/EP2008/062520
Other languages
German (de)
English (en)
Inventor
Reza Aliakbarzadeh
Norbert Sieber
Original Assignee
Continental Automotive 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 Continental Automotive Gmbh filed Critical Continental Automotive Gmbh
Publication of WO2009043737A1 publication Critical patent/WO2009043737A1/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
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1493—Details
    • F02D41/1495—Detection of abnormalities in the air/fuel ratio feedback system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/008—Controlling each cylinder individually
    • 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
    • F02D41/2454—Learning of the air-fuel ratio control
    • F02D41/2458—Learning of the air-fuel ratio control with an additional dither signal
    • 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
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1413—Controller structures or design
    • F02D2041/1432—Controller structures or design the system including a filter, e.g. a low pass or high pass filter
    • 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
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices

Definitions

  • the present invention relates to a method for determining the dynamic properties of an exhaust gas sensor arranged in the exhaust tract of an internal combustion engine.
  • the decisive features of such sensors include the dynamic behavior, which is necessary, for example, for fast control functions in which a high-temporal evaluation of the probe signal is required. Accordingly, these sensors are to be monitored for deterioration of the dynamic behavior, ie, a slowed response of the sensor, and an error case is to be displayed. Slower dynamics can be caused, for example, by contamination or aging of the sensor.
  • Lambda probes for example, evaluate the dynamic response of changes in the air-fuel ratio from rich ( ⁇ ⁇ l) to lean ( ⁇ > l) or lean to rich, either by forced excitation (in systems with continuous lambda probes) or by 2-point control (in systems with binary lambda probes in front of a catalytic converter).
  • the transition from homogeneous operation to fuel cut-off and vice versa can be used, the latter is particularly suitable for sensors that are installed after a three-way or NO x storage catalyst. These are usually binary lambda or NO x sensors.
  • the determination of the signal dynamics takes place by means of one of several possible evaluation criteria. It is customary for the assessment of the signal dynamics to be either a signal swing after elapse of a predetermined period of time, or a time for the strike through of a signal swing, or the derivation of the signal profile - compare the above-mentioned generic publication - determined and used. The signal swing is triggered in each case by already mentioned examples of transitions in the air-fuel ratio.
  • the diagnosis of the exhaust gas probe on the basis of the signal dynamics is usually achieved by comparing the evaluation criterion used, or its determined value, with a set limit value. Depending on the result of this comparison, an error is entered in the fault memory of the engine control unit.
  • DE 102 60 721 A1 discloses a method for diagnosing the dynamic properties of a lambda probe used for cylinder-specific lambda control which does not respond to the reaction of the sensor signal to a change in the mixture but to the reaction of a manipulated variable of the lambda control. It is also known to detune the value of lambda of at least one cylinder by a predefinable value and to check whether the detuning is mapped as an offset or factor in the manipulated variable of the respective controller of the lambda control. In the case of a good check, i. the probe dynamics is considered sufficient, created by the trim no exhaust emission disadvantage, since the trim is almost completely corrected.
  • the object of the present invention is to provide an improved method of the type mentioned that reacts in particular to slight deterioration of the dynamic behavior.
  • this object is achieved by a method according to claim 1.
  • Advantageous embodiments and further developments of the present invention will become apparent from the following description, the drawings and the dependent claims.
  • this object is achieved in a method of the type mentioned above in that the cylinders are charged with a disturbance pattern of cylinder-specific mixture deviations and that the signal dynamics of a signal of the sensor reflecting the disturbance pattern are determined.
  • the invention is based on the fact that the air-fuel ratio of individual cylinders is influenced in a targeted manner, and that the reaction thereby triggered in the signal of the sensor is evaluated with regard to the signal dynamics. This can be done so that the desired before the application of the method for determining the dynamic properties of the sensor desired air-fuel ratio is maintained.
  • checking the dynamic behavior is, on the one hand, emission-neutral if, for all interference patterns, the boundary condition of the emission stability during application of the method is also observed for a limit-loaded (good) system, taking into account the burn limits.
  • the test imposes a change pattern of high noise frequency on the signal curve, so that a high temporal resolution, i.
  • the catalyst Even with short-term deviation from the average desired air-fuel ratio, for example, with a disturbance pattern + 10% / 0% / 0% / 0%, the catalyst still succeeds, to process the mixture deviation emission neutral, while according to the invention, the signal dynamics is determined.
  • the inventive method comes without transitions of the engine operating state from fired operation in overrun fuel cutoff and vice versa.
  • the method according to the invention can also be designed to be emission-neutral for a limit-load system. Globally requested, regulated or piloted changes in the air-fuel ratio to rich or lean are not required.
  • the method according to the invention can be used in normal stationary operating states, both for homogeneous and for stratified operating states.
  • the inventive method can basically be used for all exhaust gas sensors whose signal reacts to changes in the air-fuel ratio. However, it must be ensured that the positioning of the considered sensor in the exhaust system is suitable for the detection of cylinder-specific mixture fluctuations.
  • the interference pattern is imaged in the waveform in the form of successive peaks, wherein the signal dynamics is determined on the basis of a rating criterion, which ties to at least one property of the waveform.
  • a rating criterion which ties to at least one property of the waveform.
  • the usual evaluation criteria amplitude height, edge steepness of the signal, etc. can be used.
  • a comparison of the measured sensor signal with a signal modeled using a model can be used as the evaluation criterion.
  • the evaluation criterion includes a time criterion. In particular, with knowledge of the ignition timing of a particular cylinder, a delay time (delay) between the cylinder-specific fault and the associated signal response can also be determined.
  • More complex strategies for determining the value of the evaluation criterion are also possible, in which the cylinders are fed with a sequence of at least two different interference patterns, and in which the evaluation criterion for determining the signal dynamics is then connected to the signal characteristics belonging to the various interference patterns anknüpft.
  • a favorable interference pattern +10% / - 10% / 0% / 0% can be realized by feeding two consecutive cylinders with a mixture deviation of + 10% and -10% respectively from the nominal value, and that the other cylinders without Deviations are fed.
  • an interference variation of +10% / - 10% / + 10% / - 10% can be realized in an advantageous variation, which is twice the interference frequency as the interference pattern +10% / - 10% / 0% / 0%.
  • a targeted influencing of the interference frequency is achieved by selecting the interference pattern, wherein a higher temporal resolution with regard to the determination of a slowed dynamic behavior of the sensor or of the signal can be set by a higher interference frequency.
  • a grading of the evaluation criterion is possible, i. E. It is possible to set different "measuring ranges" for the determination of the signal dynamics, and a sequence of different interference sequences and correlation of the respective results for determining the actual evaluation criterion is also conceivable in this context.
  • All embodiments of the invention can be advantageously used in such a way that for the diagnosis of the sensor, the determined signal dynamics with a calibrated limit compared and the result of the comparison is stored in a control unit.
  • 1 is a block diagram of the exhaust system of an internal combustion engine with exhaust aftertreatment system
  • FIG. 3 shows the lambda signal curves according to FIG. 2, but for a periodic interference pattern +10% / -10% / + 10% / -10% with twice the interference frequency compared to FIG.
  • FIG. 4 shows a section from the left-hand curve of FIG. 2.
  • the internal combustion engine 1 shown in FIG. 1 has in its exhaust tract 2 an exhaust aftertreatment system which is to have OBD (self-diagnosis) capabilities.
  • OBD self-diagnosis
  • a three-way pre-catalyst 4 and a NO x storage catalytic converter 5 are arranged in the exhaust tract 2 of the internal combustion engine 1. It is also possible a single catalyst, showing both properties. Upstream of these two catalytic converters is a pre-cat lambda probe 3 and downstream of it a NO x measuring transducer 6.
  • the operation of the internal combustion engine 1 and of the exhaust gas aftertreatment system is controlled by an operating control device 7, which inter alia monitors the measured values of the pre-catalyst lambda Probe 3 and the NO x -Messauf choirs 6 gets supplied and performs the OBD.
  • the dynamic behavior of the sensor 3 should be checked. If the dynamic behavior of the probe 6 is to be checked, an arrangement is advantageous in which the probe 6, unlike that shown in FIG. 1, is not downstream, but upstream of the associated catalyst 5 is arranged.
  • FIGS. 2 and 3 show signal curves of a binary lambda probe 3 mounted in front of a catalytic converter 4 for a selected load point.
  • the signal response of a nominal lambda probe (left curve), whose jump time (at 600-300 mV) is 20-30 ms, is compared with a lambda probe whose waveform was simulated dynamically by an electronic low-pass filter (right-hand curve) that their slowed-down time (in said range) is 110 ms.
  • this vibration is used to determine the dynamic behavior of the pre-catalyst lambda Probe 3 to check.
  • the excitation of the lambda oscillation implicitly results from the two-point control, here with the period duration of approximately 600 ms which can be recognized in FIGS. 2 and 3.
  • V LS U La mbda-signai
  • the control unit 7 for evaluating the lambda signal also perform a Fourier transformation.
  • the height of the signal voltage of a peak which is present in each case at two predetermined times, or the duration for passing through a signal swing associated with a peak can also be used as the evaluation criterion.
  • a comparison of an ignition point of a cylinder and the time of occurrence of the associated signal reaction an evaluation criterion for the detection of a delay-like aging can be obtained.
  • interference patterns are possible, for example according to the sequence + 10% / 0% / - 10% / 0%.
  • the interference pattern for a duration to be determined can also be called alternately, that is, the cylinders are charged with a sequence of at least two different interference patterns.
  • the disturbance pattern (or a series of disturbance patterns) is usually repeated periodically for a certain period of time.
  • an application of the method for diagnosis is possible by comparing the determined evaluation criterion with a calibrated limit value, and depending on the logical result of the comparison in the engine control unit 7 as "error” or "no error" is stored.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

Pour la détermination de la dynamique de signal d'une sonde à gaz d'échappement, les cylindres sont alimentés selon un modèle de perturbation composé d'écarts de mélange spécifiques à chaque cylindre. Le rapport air/carburant de cylindres individuels est modifié de telle manière par rapport à la valeur nominale, que le rapport air/carburant normal souhaité est essentiellement conservé en moyenne sur tous les cylindres, et que la dynamique du signal (8, 10, 11, 12) du capteur, reproduisant le modèle de perturbation, est déterminée.
PCT/EP2008/062520 2007-09-26 2008-09-19 Procédé de détermination des propriétés dynamiques d'un capteur de gaz d'échappement d'un moteur à combustion interne WO2009043737A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710045984 DE102007045984A1 (de) 2007-09-26 2007-09-26 Verfahren zur Ermittlung der dynamischen Eigenschaften eines Abgassensors einer Brennkraftmaschine
DE102007045984.1 2007-09-26

Publications (1)

Publication Number Publication Date
WO2009043737A1 true WO2009043737A1 (fr) 2009-04-09

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PCT/EP2008/062520 WO2009043737A1 (fr) 2007-09-26 2008-09-19 Procédé de détermination des propriétés dynamiques d'un capteur de gaz d'échappement d'un moteur à combustion interne

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DE (1) DE102007045984A1 (fr)
WO (1) WO2009043737A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010031060A1 (de) 2010-07-07 2012-01-12 Robert Bosch Gmbh Verfahren zum Betreiben eines Sensorelements
DE102013220117B3 (de) * 2013-10-04 2014-07-17 Continental Automotive Gmbh Vorrichtung zum Betreiben einer Brennkraftmaschine
DE102016006328A1 (de) * 2016-05-24 2017-11-30 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Verfahren und Vorrichtung zum Überprüfen eines Sauerstoffsensors

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0637684A1 (fr) * 1993-03-15 1995-02-08 Ford Motor Company Surveillance améliorée du fonctionnement d'une sonde à oxygène pour gaz d'echappement
DE19828929A1 (de) 1998-06-29 2000-01-05 Siemens Ag Verfahren zur Überprüfung des Dynamikverhaltens eines Meßaufnehmers im Abgastrakt einer Brennkraftmaschine
US20020022921A1 (en) * 2000-08-18 2002-02-21 Hitachi, Ltd. Engine self-diagnosis apparatus and control apparatus
US20020108432A1 (en) * 2001-02-13 2002-08-15 Maloney Peter James Frequency response test method for an in-vehicle air/fuel ratio sensor
DE10260721A1 (de) 2002-12-23 2004-07-29 Volkswagen Ag Verfahren und Vorrichtung zur Diagnose der dynamischen Eigenschaften einer zur zylinderindividuellen Lambdaregelung verwendeten Lambdasonde
EP1548259A2 (fr) * 2003-12-26 2005-06-29 Hitachi, Ltd. Régulateur de moteur

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Publication number Priority date Publication date Assignee Title
US5370101A (en) * 1993-10-04 1994-12-06 Ford Motor Company Fuel controller with oxygen sensor monitoring and offset correction
DE19903721C1 (de) * 1999-01-30 2000-07-13 Daimler Chrysler Ag Betriebsverfahren für eine Brennkraftmaschine mit Lambdawertregelung und Brennkraftmaschine
DE102004062408B4 (de) * 2004-12-23 2008-10-02 Continental Automotive Gmbh Verfahren und Vorrichtung zum Ermitteln einer Sauerstoffspeicherkapazität des Abgaskatalysators einer Brennkraftmaschine und Verfahren und Vorrichtung zum Ermitteln einer Dynamik-Zeitdauer für Abgassonden einer Brennkraftmaschine
DE102005024872A1 (de) * 2005-05-31 2006-12-14 Siemens Ag Verfahren und Vorrichtung zum Ermitteln einer Sauerstoffspeicherkapazität des Abgaskatalysators einer Brennkraftmaschine und Verfahren und Vorrichtung zum Ermitteln einer Dynamik-Zeitdauer für Abgassonden einer Brennkraftmaschine
EP1734241B1 (fr) * 2005-06-17 2008-09-03 Ford Global Technologies, LLC Mèthode de diagnostic d'une sonde lambda secondaire dans un convertisseur catalytique

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0637684A1 (fr) * 1993-03-15 1995-02-08 Ford Motor Company Surveillance améliorée du fonctionnement d'une sonde à oxygène pour gaz d'echappement
DE19828929A1 (de) 1998-06-29 2000-01-05 Siemens Ag Verfahren zur Überprüfung des Dynamikverhaltens eines Meßaufnehmers im Abgastrakt einer Brennkraftmaschine
US20020022921A1 (en) * 2000-08-18 2002-02-21 Hitachi, Ltd. Engine self-diagnosis apparatus and control apparatus
US20020108432A1 (en) * 2001-02-13 2002-08-15 Maloney Peter James Frequency response test method for an in-vehicle air/fuel ratio sensor
DE10260721A1 (de) 2002-12-23 2004-07-29 Volkswagen Ag Verfahren und Vorrichtung zur Diagnose der dynamischen Eigenschaften einer zur zylinderindividuellen Lambdaregelung verwendeten Lambdasonde
US20060170538A1 (en) * 2002-12-23 2006-08-03 Eberhard Schnaibel Method and device for diagnosing the dynamic characteristics of a lambda probe used for the lambda regulation of individual cylinders
EP1548259A2 (fr) * 2003-12-26 2005-06-29 Hitachi, Ltd. Régulateur de moteur

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