EP0579794A1 - 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.

Info

Publication number
EP0579794A1
EP0579794A1 EP93901632A EP93901632A EP0579794A1 EP 0579794 A1 EP0579794 A1 EP 0579794A1 EP 93901632 A EP93901632 A EP 93901632A EP 93901632 A EP93901632 A EP 93901632A EP 0579794 A1 EP0579794 A1 EP 0579794A1
Authority
EP
European Patent Office
Prior art keywords
value
adaptation
decision
values
positioning
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.)
Granted
Application number
EP93901632A
Other languages
German (de)
English (en)
Other versions
EP0579794B1 (fr
Inventor
Ernst Wild
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0579794A1 publication Critical patent/EP0579794A1/fr
Application granted granted Critical
Publication of EP0579794B1 publication Critical patent/EP0579794B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • 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 operability of a lambda control for an internal combustion engine, which outputs control values FR which are intended to fluctuate by a target value FR TARGET.
  • 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 conditions give way to the practical operation of an internal combustion engine. drive parameters often from those used in determining the pilot values, e.g. E. a different fuel is used. Then the predetermined pre-control values do not exactly match the current operating case. To remedy this deficiency, there are so-called learning or adaptive lambda control systems. These output at least one adaptation value, with the aid of which the pilot control values are corrected. 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.
  • the object was accordingly to specify a method and a device for assessing the operability of a lambda control, which are able to indicate difficulties in the control which lead to an undesirable increase in the emission of harmful gas.
  • the inventive method for assessing the functional Ability of a lambda control that outputs control values FR that are to fluctuate by a target value FR_SOLL, which lambda control is supported by an adaptation that outputs adaptation values, is characterized in that
  • the current value EW of a decision variable is continuously calculated, which indicates the average amount of deviation of the manipulated values from the setpoint;
  • an error signal is issued if the current value. exceeds the decision size threshold.
  • the decision values are used to assess 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 further advantageous to determine the decision value with a larger time constant than the at least one adaptation value. Then errors are generally displayed via the adaptation values, while the decision value is only displayed in special cases.
  • the values of the decision size and the adaptation sizes increase. After a maximum of a few 10 seconds, the high load range will be left. Because at least one adaptation value has been increased, a rich mixture is now set, as a result of which the manipulated value deviates from the setpoint manipulated value on the other side than before. The at least one increased adaptation value is therefore reduced again. On the other hand, the decision value is further increased since, in contrast to the adaptation values, what matters is the average deviation of the manipulated values from the target value in terms of the amount.
  • the device according to the invention for assessing the functionality of a lambda control which outputs control values FR, which should fluctuate by a target value FR_S0LL, which lambda control is supported by an adaptation that outputs adaptation values, is characterized by:
  • a calculation device for continuously calculating the current value EW of a decision variable, which indicates the averaged amount of deviation of the manipulated values from the setpoint value;
  • a comparison device which compares the current value with a decision variable threshold value SW_EW and outputs an error signal if the current value exceeds the decision variable threshold value.
  • Block function diagram for explaining a method according to the invention and a device according to the invention for assessing the functionality of a lambda control
  • 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 are 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 multiplication is carried out in the adaptation multiplier 17 by a multiplicative adaptation value AWM, and finally multiplication in the regulation multiplier 18 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 sol 1 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. E. also without map.
  • the adaptation adder 16 and the adaptation multiplier 17 can also be located behind the control multiplier 18 instead of in front of it. Instead of two adaptation values, the adaptation 15 can also output only a single or even three safe values or even more.
  • leakage errors can be adapted, which are preferably additive before the link to the derr.
  • St ⁇ i lwert are taken into account.
  • Multiplicative errors such as those caused by changes in air pressure or changes in fuel properties, can be taken into account in a multiplicative manner behind the link with the set value.
  • opening and shooting times can. vcr. Injection valves are adapted at high speed and high load and additively after the link with the. Actual value are taken into account.
  • the error reporting block 12 contains a calculation sheet 20 and a comparison block 21.
  • the calculation device 20 receives the Ste11 value deviation ⁇ FR and uses this to calculate an expected value EW, preferably as a variance, i. H. as the mean of the squares of the deviation from the ste1, i.e. as:
  • the simple absolute mean value can also be calculated as a decision value, i.e.:
  • an event number can be used as a decision value, for example the number that indicates how often within a predetermined period of time or within a predetermined number of examined manipulated value deviations the value j ⁇ FR I exceeds a threshold value, that is:
  • EW frequency of j ⁇ FR "threshold.
  • the decision value EW it is not the specific type of calculation that is essential, but it is important that a deviation averaged in terms of amount be determined. It depends on the use of the amount kcm ⁇ * .t so that set value deviations, such as those caused by the occurrence of an error, as well as those caused by the disappearance of this error, are taken into account.
  • the averaging is of significance, so that not every rapidly passing larger value deviation for the output of an error signal F ⁇ occurs by the comparison block 21, namely the current one.
  • the decision value EW is compared with a decision value threshold value and outputs the error signal when the decision value exceeds the decision size threshold value.
  • the averaging is carried out with the aid of a digital low-pass filter, as explained below with reference to step ⁇ 2 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 integrating element.
  • 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 one is carried out in a step S1. Values ⁇ FR of the manipulated variable deviation, AWA of the adaptive adaptation variable and AWM of the multiplicative adaptation variable are recorded.
  • the maintenance value EW is determined by digital low-pass filters r. ⁇ from the previously valid value EW and the current manipulated variable deviation ⁇ FR with that specified in the block for step s2.
  • c is the low-pass constant which, for the exemplary embodiment, has the value 0.99 on ice.
  • step ⁇ 5 the l ⁇ r is entered in an error memory, and an error signal is output, which may e.g. B. brings a warning lamp to light up. After step so the end of the procedure is reached.
  • 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 ⁇ FR averaged exceeds an associated threshold value. In this way, the comparisons made with the aid of the adaptation values can be omitted entirely. Furthermore, a variant It is possible that the end of the procedure is not reached after the error message step, but that the loop mentioned is repeated from step S1 despite the error that has been found, thereby opening up a possibility of error recovery, e.g. E. in that the error entry is deleted again if an error does not occur again after a predetermined high number of runs. If the error message was triggered by the decision value exceeding its assigned threshold value, this error can also be used to store the values of selected operating variables as they existed when the error occurred. If dar ..: The same operating state is started several times without an error message again, the error entry can be deleted again.
  • the manipulated value output by the lambda control deviates from the target value, which means that at least one adaptation value and the decision value change.
  • the target value outputted from the regeiung Lambda ⁇ in the other direction deviates from the desired regulated value. Since these deviations are averaged in terms of amount when calculating the decision value, they have a stronger effect on the decision value than on the at least one adaptation value, which is immediately reduced again as soon as the sign of the deviation in the set value has reversed. Therefore, with the help of the decision value, errors can be determined that cannot be detected with the help of an adaptation value.

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

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.
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

Publications (2)

Publication Number Publication Date
EP0579794A1 true EP0579794A1 (fr) 1994-01-26
EP0579794B1 EP0579794B1 (fr) 1995-12-06

Family

ID=6451149

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93901632A Expired - Lifetime EP0579794B1 (fr) 1992-02-07 1993-01-14 Procede et dispositif permettant d'evaluer la capacite a fonctionner d'une regulation lambda

Country Status (6)

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

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9316277A1 *

Also Published As

Publication number Publication date
JPH06506752A (ja) 1994-07-28
DE59301082D1 (de) 1996-01-18
JP3451087B2 (ja) 2003-09-29
EP0579794B1 (fr) 1995-12-06
WO1993016277A1 (fr) 1993-08-19
US5404861A (en) 1995-04-11
KR100237272B1 (ko) 2000-01-15
DE4203502A1 (de) 1993-08-12

Similar Documents

Publication Publication Date Title
EP0975942B1 (fr) Procede et dispositif pour la surveillance du fonctionnement d'un capteur de pression
DE19964424B3 (de) Vorrichtung zum Diagnostizieren von Störungen und Fehlerbedingungen in einer Kraftstoffanlage einer Verbrennungskraftmaschine
EP0811116B1 (fr) Procede et dispositif de controle du systeme de dosage de carburant d'un moteur a combustion interne
DE4001616C2 (de) Verfahren und Vorrichtung zur Kraftstoffmengenregelung für eine Brennkraftmaschine mit Katalysator
DE4219339C2 (de) Abgasrückführungsvorrichtung mit Fehlerdiagnose
DE4112477C2 (de) Verfahren und Vorrichtung zum Simulieren des zeitlichen Verhaltens des Lambda-Wertes am Auslaß eines Abgaskatalysators und zur Betimmung des Alterungszustandes des Katalysators
EP0546318B1 (fr) Méthode et dispositif pour la détermination du rendement de conversion d'un catalyseur
WO2016155986A1 (fr) Procédé et dispositif de détermination d'une valeur de correction pour un ensemble d'injection de carburant
DE19600693A1 (de) Kraftstoffzuführsystem für Motoren mit einer Kraftstoffdruckregelung
DE4117440A1 (de) Adaptive kraftstoff/luft-gemisch-einstellung zum beruecksichtigen von kraftstoffeigenschaften
WO2018001675A1 (fr) Procédé pour déterminer une valeur de correction pour un dosage de carburant d'un injecteur de carburant
DE3447471A1 (de) Vorrichtung und verfahren zum feststellen der rotierenden stroemungsabloesung im verdichter eines triebwerkes
EP0579794A1 (fr) Procede et dispositif permettant d'evaluer la capacite a fonctionner d'une regulation lambda.
CH681827A5 (fr)
EP1342901B1 (fr) Procédé de détection de fuites dans un collecteur d'admission d'un moteur à combustion interne
DE3214195C2 (fr)
DE3744222A1 (de) Verfahren und einrichtung zur beeinflussung der luftzumessung bei einer brennkraftmaschine, insbesondere im leerlauf und schubbetrieb
DE4134522A1 (de) Einrichtung und verfahren zur elektronischen kraftstoffeinspritzsteuerung fuer verbrennungsmotor
EP1259719B1 (fr) Procede et dispositif pour commander un moteur a combustion interne multicylindre
DE102016214464B4 (de) Verfahren zum Ermitteln eines Korrekturwertes für eine Kraftstoffzumessung eines Kraftstoffinjektors
DE102005038492B4 (de) Verfahren und Vorrichtung zur Offsetbestimmung eines berechneten oder gemessenen Lambdawertes
DE102010033317B4 (de) Verfahren zum Bereiben eines Kraftstoffeinspritzsystems und Einspritzsystem
DE102019202004A1 (de) Verfahren zum Betreiben eines Einspritzsystems einer Brennkraftmaschine, Einspritzsystem für eine Brennkraftmaschine sowie Brennkraftmaschine mit einem solchen Einspritzsystem
DE10138045A1 (de) Vorrichtung und Verfahren zur CPU-Diagnose
WO2005068810A1 (fr) Procede et appareil de commande permettant de faire fonctionner un moteur a combustion interne pourvu d'un systeme d'injection

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19930908

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE GB

17Q First examination report despatched

Effective date: 19941124

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE GB

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19951207

REF Corresponds to:

Ref document number: 59301082

Country of ref document: DE

Date of ref document: 19960118

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20050106

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20050311

Year of fee payment: 13

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060114

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060801

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20060114