EP0579794B1 - Procede et dispositif permettant d'evaluer la capacite a fonctionner d'une regulation lambda - Google Patents

Procede et dispositif permettant d'evaluer la capacite a fonctionner d'une regulation lambda Download PDF

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Publication number
EP0579794B1
EP0579794B1 EP93901632A EP93901632A EP0579794B1 EP 0579794 B1 EP0579794 B1 EP 0579794B1 EP 93901632 A EP93901632 A EP 93901632A EP 93901632 A EP93901632 A EP 93901632A EP 0579794 B1 EP0579794 B1 EP 0579794B1
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Prior art keywords
value
adaptation
values
decision
lambda control
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EP93901632A
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German (de)
English (en)
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EP0579794A1 (fr
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Ernst Wild
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • 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
    • F02D41/24—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

Definitions

  • the following relates to a method and a device for assessing the functionality of a lambda control for an internal combustion engine, which outputs control values FR which are intended to fluctuate by a setpoint value FR_SOLL.
  • the pilot control values are determined for a respective internal combustion engine for precisely defined operating values and operating parameters. Now, however, the current operating parameters give way to practical operation of an internal combustion engine often from those used in determining the pre-control values, e.g. B. a different fuel is used. Then the predetermined pilot control values do not exactly match the current operating situation. So-called learning or adaptive lambda control systems exist to remedy this deficiency. These output at least one adaptation value, which is used to correct the input tax values. The adaptation value is determined with the aid of the deviation that the control value output by the lambda controller has from a target control value.
  • Errors that increase the harmful gas stop can occur while operating an internal combustion engine.
  • the California environmental agency CARB demands that an error should be displayed if the permissible limit value for a harmful gas is exceeded by 50% in the so-called FTP cycle.
  • it has proposed monitoring at least one adaptation value and outputting an error signal if it exceeds a predetermined threshold value.
  • the object was accordingly to specify a method and a device for assessing the operability of a lambda control, which are capable of indicating difficulties in the control which lead to an undesirable increase in the emission of harmful gas.
  • the decision values are used to judge whether the error signal is to be output, but also the values of the at least one adaptation variable are used.
  • the error signal is output either when the current decision value exceeds the associated threshold value or when an adaptation value exceeds its associated threshold value.
  • the decision value is used in addition to the adaptation values for assessing the functionality, it is of further advantage to determine the decision value with a longer time constant than the at least one adaptation value. Then errors are usually displayed via the adaptation values, while the decision value is only displayed in special cases.
  • the decision value is further increased, since, in contrast to the adaptation values, the average amount of deviation of the manipulated values from the nominal manipulated value is important.
  • the adaptation values With the aid of the adaptation values, only faults can be displayed that affect the entire operating range of an internal combustion engine, be it a little more or a little less in individual sub-areas.
  • the decision value not only these errors can be recognized, but also those that only affect a sub-area.
  • FIG. 1 shows an internal combustion engine 10 with a lambda control block 11 with pilot-controlled adaptive lambda control and an error message block 12.
  • the lambda control block 11 there is a pilot control map 13, a lambda control 14, an adaptation 15, an adaptation adder 16, an adaptation multiplier 17 and a control multiplier 18.
  • the pilot control map 13 is addressed via speed values n and load values L and outputs pilot values tv for injection times.
  • An adaptive adaptation value AWA is added to a respective pilot control value in the adaptation adder 16, then is multiplied in the adaptation multiplier 17 by a multiplicative adaptation value AWM, and finally in the regulation multiplier 18 is multiplied by a regulation factor FR.
  • the latter is formed by the lambda control 14 on the basis of a control deviation between an actual lambda value ⁇ _IST and a target lambda value ⁇ _SOLL.
  • the control factor FR is the manipulated variable of the lambda control.
  • the setpoint "1" is subtracted from this manipulated value in a subtraction device 19, and the adaptation values AWA and AWM are calculated by the adaptation 15 with the aid of the manipulated value deviation ⁇ FR thus formed.
  • the pre-control values tv can be determined in a variety of ways, e.g. B. also without map.
  • the adaptation adder 16 and the adaptation multiplier 17 can also lie behind the control multiplier 18 instead of in front of it.
  • the adaptation 15 can also output only one or even three such values or even more.
  • leakage air errors can be adapted, which are preferably taken into account additively before being linked to the manipulated variable.
  • Multiplicative errors such as those caused by changes in air pressure or changes in fuel properties, can be taken into account multiplicatively before or after the link with the manipulated variable.
  • the opening and closing times of injection valves at high speed and high load can be adapted and taken into account additively after being linked to the manipulated variable.
  • the error message block 12 contains a calculation block 20 and a comparison block 21.
  • an event number can be used as a decision value, for example the number that indicates how often the value
  • within a predetermined time period or within a predetermined number of manipulated value deviations examined exceeds a threshold, so: EW frequency of
  • the averaging is important so that not every rapidly transient larger control value deviation for the output of an error signal FS occurs through the comparison block 21, which compares the current decision value EW with a decision variable threshold value and outputs the error signal when the decision value exceeds the decision variable threshold value exceeds.
  • the averaging is carried out with the aid of a digital low-pass filter, as explained further below using step s2 of the flowchart in FIG. 2.
  • a low-pass constant is used which corresponds to a time constant of a few 10 seconds in the case of a corresponding integrator.
  • a method can be carried out with the functional blocks according to FIG. 1, as will now be described with reference to FIG. 2.
  • the expected value EW is set to "1" in an initialization step si.
  • threshold values SW_EW, SW_AWA and SW_AWM are set up predefined values set. In all three cases, the exemplary embodiment has the value 1.2.
  • the method then enters a loop in which the current values ⁇ FR of the manipulated variable deviation, AWA of the adaptive adaptation variable and AWM of the multiplicative adaptation variable are first recorded in a step s1.
  • the expected value EW is calculated by digital low-pass filtering from the previously applicable value EW and the current manipulated variable deviation ⁇ FR using the formula given in block s2.
  • c is the low-pass constant, which has the value 0.99 in the exemplary embodiment.
  • Step s3 to s5 now follow, in which it is queried in turn whether the values AWA, AWM bsw. EW are each greater than the assigned threshold value SW_AWA, SW_AWM or SW_EW. If none of these questions is answered in the affirmative, a final step se examines whether an end condition is met. If this is the case, the method is terminated, otherwise the loop is repeated from step s1. If it turns out during the queries in steps s3 to s5 that one of the threshold values is exceeded, the error is entered in an error memory in a step s6, and an error signal is output. B. brings up a warning lamp. The end of the method is reached after step s6.
  • the method just described can be modified in many ways as long as it is only ensured that it is examined whether the manipulated variable deviation .DELTA.FR averaged over the amount exceeds an associated threshold value. This means that the comparisons made using the adaptation values can be omitted entirely.

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  • 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

Procédé permettant d'évaluer la capacité à fonctionner d'une régulation lambda qui fournit des valeurs de positionnement FR devant varier autour d'une valeur de positionnement théorique FR-SOLL. Cette régulation lambda est assistée par un dispositif d'adaptation qui fournit des données d'adaptation. Ce procédé se caractérise par le fait: que la valeur actuelle EW d'une grandeur de décision est calculée en continu; cette grandeur de décision indique l'écart moyen des valeurs de positionnement par rapport à la valeur de positionnement théorique; que la valeur actuelle est comparée à une valeur de seuil des grandeurs de décision SW-EW; et qu'un signal d'erreur est émis lorsque la valeur actuelle excède la valeur de seuil des grandeurs de décision. Ce procédé présente l'avantage de permettre également d'identifier des erreurs qui ne se produisent que dans des parties de l'ensemble de la plage de fonctionnement d'un moteur à combustion interne, pour laquelle l'alimentation en carburant est régulée par la régulation lambda. Lorsqu'un cas de ce type se produit, la valeur de positionnement fournie par la régulation lambda s'écarte de la valeur de positionnement théorique, ce qui entraîne la modification d'une valeur d'adaptation. Si la plage générant des erreurs est à nouveau quittée, la valeur d'adaptation modifiée ne convient alors plus à la plage de fonctionnement correct. C'est la raison pour laquelle la valeur de positionnement fournie par la régulation lambda s'écarte dès lors de la valeur de positionnement théorique, dans l'autre sens. Comme on établit la moyenne de ces écarts lors du calcul de la valeur de décision, ils interviennent davantage dans la valeur de décision que dans la (ou du moins d'une) valeur d'adaptation qui est à nouveau abaissée dès que le signe de l'écart de la valeur de positionnement s'est inversé. La valeur de décision permet de déterminer des erreurs qu'une valeur d'adaptation ne permet pas de déceler.

Claims (8)

  1. Procédé d'évaluation de l'aptitude à fonctionner d'une régulation lambda, émettant des valeurs de réglage (FR) qui doivent osciller autour d'une valeur de consigne de réglage (FR_cons), cette régulation lambda étant assistée par une adaptation émettant des valeurs d'adaptation, procédé selon lequel :
    - on calcule en continu la valeur instantanée (EW) d'une grandeur de décision qui indique la déviation en amplitude, moyenne, des valeurs de réglage par rapport à la valeur de réglage de consigne,
    - qui compare la valeur réelle à une valeur de seuil de grandeur de décision (SWEW) et
    - émet un signal d'erreur (FS) lorsque la valeur réelle dépasse la valeur du seuil de la grandeur de décision (EW > SWEW).
  2. Procédé selon la revendication 1, caractérisé en ce qu'on calcule la valeur de décision EW selon la formule suivante : EW = |(FR - FR_cons)| ¯ .
    Figure imgb0010
  3. Procédé selon la revendication 1, caractérisé en ce qu'on calcule la valeur de décision par la formule suivante : EW = (FR - FR_cons)² ¯ .
    Figure imgb0011
  4. Procédé selon la revendication 1, caractérisé en ce qu'on calcule la valeur de décision EW de la manière suivante : EW = fréquence de |(FR - FR_cons)|.
    Figure imgb0012
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce qu'on fait la moyenne à l'aide d'un filtre passe-bas numérique.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce qu'on émet le signal d'erreur (FS) également lorsqu'au moins l'une des valeurs d'adaptation dépasse une valeur de seuil d'adaptation correspondante (SW_AWA, SW_AWM).
  7. Procédé selon la revendication 6, caractérisé en ce qu'on détermine la valeur de décision (EW) avec des constantes de temps plus grandes qu'au moins une valeur d'adaptation (AWA, AWM).
  8. Dispositif d'évaluation de l'aptitude à fonctionner d'une régulation lambda, émettant des valeurs de seuil (FR) qui doivent osciller autour d'une valeur de consigne de seuil (FR_cons), la régulation lambda étant soutenue par une adaptation émettant des valeurs d'adaptation avec une
    - installation de calcul (20) pour calculer en continu la valeur instantanée (EW) d'une grandeur de décision qui indique la déviation en amplitude, moyenne, des valeurs de réglage par rapport à la valeur de consigne de réglage, et
    - une installation de comparaison (21) qui compare la valeur réelle à une valeur de seuil de grandeur de décision (SWEW) et émet un signal d'erreur lorsque la valeur réelle dépasse la valeur de seuil de la grandeur de décision.
EP93901632A 1992-02-07 1993-01-14 Procede et dispositif permettant d'evaluer la capacite a fonctionner d'une regulation lambda Expired - Lifetime EP0579794B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4203502 1992-02-07
DE4203502A DE4203502A1 (de) 1992-02-07 1992-02-07 Verfahren und vorrichtung zum beurteilen der funktionsfaehigkeit einer lambdaregelung
PCT/DE1993/000017 WO1993016277A1 (fr) 1992-02-07 1993-01-14 Procede et dispositif permettant d'evaluer la capacite a fonctionner d'une regulation lambda

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EP0579794B1 true EP0579794B1 (fr) 1995-12-06

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US (1) US5404861A (fr)
EP (1) EP0579794B1 (fr)
JP (1) JP3451087B2 (fr)
KR (1) KR100237272B1 (fr)
DE (2) DE4203502A1 (fr)
WO (1) WO1993016277A1 (fr)

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EP0707685B1 (fr) * 1992-07-28 1997-04-02 Siemens Aktiengesellschaft Procede d'adaptation, aux variables en cours de l'air exterieur, des valeurs d'air d'un diagramme caracteristique de substitution utilise lorsqu'il se produit des pulsations de l'air dans la tubulure d'admission d'un moteur a combustion interne pour commander la formation du melange
DE4342136B4 (de) * 1993-12-10 2004-03-11 Audi Ag Verfahren zur Diagnose einer Lambda-Sonde
US5617836A (en) * 1995-10-04 1997-04-08 Ford Motor Company Engine control system for producing and responding to an index of maturity of adaptive learing
US5847271A (en) * 1996-05-08 1998-12-08 Chrysler Corporation Catalytic converter efficiency monitor
US7096358B2 (en) * 1998-05-07 2006-08-22 Maz Technologies, Inc. Encrypting file system
DE19844994C2 (de) * 1998-09-30 2002-01-17 Siemens Ag Verfahren zur Diagnose einer stetigen Lambdasonde
DE10202156B4 (de) * 2002-01-22 2010-08-26 Volkswagen Ag Verfahren zum Betreiben einer Brennkraftmaschine
DE102014017034A1 (de) * 2014-11-18 2015-10-29 Audi Ag Verfahren zum Betreiben einer Brennkraftmaschine sowie entsprechende Brennkraftmaschine
DE102019124259A1 (de) * 2019-09-10 2021-03-11 Bayerische Motoren Werke Aktiengesellschaft Ermitteln eines Sensorfehlers eines Sensors in einem Abgasstrang eines Kraftfahrzeugs

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JPS58222939A (ja) * 1982-05-28 1983-12-24 Honda Motor Co Ltd 内燃エンジンの酸素濃度検出系故障時の空燃比制御方法
JPS6181541A (ja) * 1984-09-19 1986-04-25 Honda Motor Co Ltd 内燃エンジンの排気ガス濃度検出系の異常検出方法
JPH0697002B2 (ja) * 1984-11-30 1994-11-30 日本電装株式会社 空燃比センサの良否判定装置
DE3811262A1 (de) * 1988-04-02 1989-10-12 Bosch Gmbh Robert Lernendes regelungsverfahren fuer eine brennkraftmascchine und vorrichtung hierfuer
US4947818A (en) * 1988-04-28 1990-08-14 Toyota Jidosha Kabushiki Kaisha Internal combustion engine with device for warning of malfunction in an air-fuel ratio control system
JPH0819871B2 (ja) * 1990-02-28 1996-02-28 本田技研工業株式会社 内燃エンジンの燃料供給系の異常検出方法

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JPH06506752A (ja) 1994-07-28
EP0579794A1 (fr) 1994-01-26
DE59301082D1 (de) 1996-01-18
JP3451087B2 (ja) 2003-09-29
WO1993016277A1 (fr) 1993-08-19
US5404861A (en) 1995-04-11
KR100237272B1 (ko) 2000-01-15
DE4203502A1 (de) 1993-08-12

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