EP0175596A1 - Verfahren für die anpassungsfähige Steuerung der Kraftstoffeinspritzung eines Einspritzmotors - Google Patents

Verfahren für die anpassungsfähige Steuerung der Kraftstoffeinspritzung eines Einspritzmotors Download PDF

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Publication number
EP0175596A1
EP0175596A1 EP85401363A EP85401363A EP0175596A1 EP 0175596 A1 EP0175596 A1 EP 0175596A1 EP 85401363 A EP85401363 A EP 85401363A EP 85401363 A EP85401363 A EP 85401363A EP 0175596 A1 EP0175596 A1 EP 0175596A1
Authority
EP
European Patent Office
Prior art keywords
injection
line
function
values
regulation
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
EP85401363A
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English (en)
French (fr)
Other versions
EP0175596B1 (de
Inventor
Rémi Lefevre
Jean-Pierre Lagrue
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.)
Renault SA
Original Assignee
Renault SA
Regie Nationale des Usines Renault
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Application filed by Renault SA, Regie Nationale des Usines Renault filed Critical Renault SA
Publication of EP0175596A1 publication Critical patent/EP0175596A1/de
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Publication of EP0175596B1 publication Critical patent/EP0175596B1/de
Expired legal-status Critical Current

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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
    • F02D41/24—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
    • F02D41/2464—Characteristics of actuators
    • F02D41/2467—Characteristics of actuators for injectors
    • 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
    • F02D41/2409—Addressing techniques specially adapted therefor
    • F02D41/2412—One-parameter addressing technique
    • 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 invention relates to the precise regulation of the injection of fuel into an internal combustion engine by analysis of the exhaust gases.
  • the parameters on the control line are corrected as follows: if the inlet pressure P is less than a determined threshold, a correction is applied only to the ordinate at the origin of the line , while if the pressure value is greater than this threshold, a correction is applied only to the slope of the line.
  • This process is therefore approximate. Indeed, if the current conditions are maintained, the recalculated line always ends up passing through the current operating point, but a local anomaly can distort the calculation of all the other points. In addition, this process only works with unit richness, while the problems of energy saving and pollution lead more and more to use wealth less than unity.
  • the object of the invention is to eliminate the above drawbacks by carrying out an adaptive method of regulating injection, the adaptation of which is more precise in all its points and less sensitive to local anomalies, while accommodating n ' no matter what periodicity.
  • FIG. 1 is a diagram of the control lines in the pressure / time space
  • FIG. 2 represents the flow diagram of the process.
  • the injection time T is permanently determined by conventional regulation as a function of the intake pressure P, or in certain cases, of the flow rate.
  • a (1 + c / 256) (1 + c '/ 256)
  • (1 + f / 256) c c '... being corrections according to measured parameters, such as water temperature, air temperature, etc.
  • f being the scale coefficient.
  • the denominators 256 are arbitrary values preferably corresponding to the storage capacity of a byte so that the low correction values are reduced to integer values.
  • the values f and b can be considered as representing respectively the slope and the ordinate at the origin of the control line, without taking into account the other corrections.
  • the values of f and b are readjusted periodically as a function of the differences in richness observed by an exhaust gas analysis probe. It can be a Lambda zirconium oxide probe sensitive to an excess of oxygen, or any other probe or analysis method.
  • the signal from the probe immediately indicates whether the richness should be increased or reduced , i.e. the injection time.
  • the engine operates with a constant or variable richness depending on the circumstances but less than unity, for example 0.8, as is more and more frequently the use according to European standards in order to reduce consumption and pollution, the value of the correction is a little more complex to establish.
  • overinjection process described in the aforementioned French patent, which consists, with each adaptation cycle, of gradually increasing the injection time until the analysis probe switches, then to quickly return to the previous wealth.
  • the richness is fixed at 0.8, it suffices, from the current injection time, to increase it by 25% to theoretically obtain this changeover. If this changeover takes place sooner or later, a simple rule of three gives the value of the correction to be made.
  • the theoretical operating point M is thus determined from point A with the same abscissa on the current operating line D by a corrective term 0 (such that the ordinate of N is equal to the ordinate of A multiplied by (1 + ⁇ ).
  • the known method of over-injection also includes measures to prevent the incursion into higher riches, although brief, from introducing a sudden in the operation of the vehicle, and this by temporarily altering the ignition advance proportionately.
  • Each adaptation cycle therefore determines a theoretical operating point M at the abscissa P corresponding to the current inlet pressure. If this point M is on the regulation line D, of course there is no correction to be made. If, on the contrary, the point is outside the line, it may be necessary to correct it.
  • a medium pressure threshold is determined, and if the current pressure P is less than this threshold, only the ordinate is corrected at l origin b of line D without modifying the slope f of this line so that it progressively passes through the point theoretical M, whereas on the contrary, if this pressure is greater than the threshold, only the slope f is corrected without modifying the ordinate at the origin b so that this straight line progressively passes through the new point M.
  • This process is therefore simple but not very precise and is very sensitive to possible local anomalies.
  • the space of pressures P is divided into a certain number n of zones, for example four in the example of FIG. 1, and for each zone of rank j the average pressure P j is defined corresponding to the abscissa of the center of the zone.
  • the ideal initial regulation line D is determined, the parameters f and b of which are loaded into read-only memories.
  • the parameters f and b of the current regulation line D are loaded into random access memories and contain the values resulting from the previous use. Failing this, that is to say in the event of erasing the RAMs, these are loaded with the values f and b.
  • the adaptation cycles follow one another, which can be relatively short (a fraction of a second) if unit richness is used, and which have an interest in being more spaced apart, for example 10 minutes, if one uses a richness lower than the unit and the method of overinjection for the reason indicated above.
  • the current intake pressure P is measured and the number j of the zone in which this pressure P is found is determined. For this, we usually operates digitally and just perform a full division or rounding.
  • ⁇ j For the value of j calculated at the start of the cycle, the value indicated in FIG. 2 is calculated and assigned to the memory ⁇ j , a value which results from a purely linear expression as a function of ⁇ , since 1 / f o and 1 / f o P j are constants, as well as b o , while f and b are the current values in random access memories of the parameters of the regulation line D.
  • This purely linear computation is thus easy and fast. Of course, it only affects the ⁇ j , while the other ⁇ i , for i different from j remain at their old value.
  • the regulation of the injection time continues with the new values of the parameters f and b of the regulation line, while independently the adaptation cycle continues with a waiting loop for the fixed period before starting again at the beginning of the cycle.
  • the calculator uses only a few variables: P, j, ⁇ , f, b, ⁇ 1 (n values) and few constants: 1 / f o , 1 / f P, b o , k (n values), k ' i (n values), richness, periodicity.
  • the calculations are extremely simple, since they are all linear and with a small number of terms, and nevertheless precise enough to ensure rapid convergence possibly accommodating a high cycle period.

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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)
EP85401363A 1984-07-23 1985-07-05 Verfahren für die anpassungsfähige Steuerung der Kraftstoffeinspritzung eines Einspritzmotors Expired EP0175596B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8411668 1984-07-23
FR8411668A FR2567962B1 (fr) 1984-07-23 1984-07-23 Procede adaptatif de regulation de l'injection d'un moteur a injection

Publications (2)

Publication Number Publication Date
EP0175596A1 true EP0175596A1 (de) 1986-03-26
EP0175596B1 EP0175596B1 (de) 1988-05-25

Family

ID=9306395

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85401363A Expired EP0175596B1 (de) 1984-07-23 1985-07-05 Verfahren für die anpassungsfähige Steuerung der Kraftstoffeinspritzung eines Einspritzmotors

Country Status (6)

Country Link
US (1) US4593666A (de)
EP (1) EP0175596B1 (de)
JP (1) JPS61182437A (de)
CA (1) CA1229900A (de)
DE (1) DE3562942D1 (de)
FR (1) FR2567962B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0349811A1 (de) * 1988-07-01 1990-01-10 Robert Bosch Gmbh Regelsystem für eine Brennkraftmaschine
EP0524575A3 (en) * 1991-07-26 1994-11-23 Weber Srl Adaptive electronic injection fuel delivery control system

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2594889B1 (fr) * 1986-02-26 1990-03-09 Renault Procede de compensation de la diminution de debit d'un injecteur de moteur a combustion interne
DE3639946C2 (de) * 1986-11-22 1997-01-09 Bosch Gmbh Robert Verfahren und Einrichtung zur Kompensation des Tankentlüftungsfehlers bei einem adaptiv lernenden Kraftstoffzufuhrsystem
DE3800176A1 (de) * 1988-01-07 1989-07-20 Bosch Gmbh Robert Steuereinrichtung fuer eine brennkraftmaschine und verfahren zum einstellen von parametern der einrichtung
DE3835852A1 (de) * 1988-10-21 1990-04-26 Bosch Gmbh Robert Verfahren und vorrichtung zur temperaturbestimmung mit hilfe des innenwiderstandes einer lambdasonde
IT1238363B (it) * 1989-06-14 1993-07-16 Fiat Auto Spa Procedimento e sistema per rilevare le caratteristiche di funzionamento di un motore a combustione interna a piu cilindri, particolarmente motore a combustione interna provvisto di iniezione elettronica
EP0501531B1 (de) * 1989-06-14 1993-11-10 FIAT AUTO S.p.A. Verfahren und System zur Überwachung des Betriebverhaltens einer Brennkraftmaschine, insbesondere einer Brennkraftmaschine mit elektronischer Einspritzung
DE4029537A1 (de) * 1990-09-18 1992-03-19 Bosch Gmbh Robert Verfahren und vorrichtung zur steuerung und/oder regelung einer betriebsgroesse einer brennkraftmaschine
EP0636778B1 (de) * 1993-07-20 1998-02-04 Magneti Marelli France Verfahren und Vorrichtung zum korrigieren der Kraftstoffeinspritzungsdauer in Abhängigkeit des Durchflusses einer Tankentlüftungsanlage für einen Einspritzmotor
FR2708049B1 (fr) * 1993-07-20 1995-09-22 Solex Procédé et dispositif d'estimation de la teneur en combustible d'un circuit de purge à canister, pour moteur à injection.
FR2708047B1 (fr) * 1993-07-20 1995-09-22 Solex Procédé et dispositif d'autoadaptation de richesse et d'autorisation de purge d'un circuit de purge à canister de moteur à injection.
US5464000A (en) * 1993-10-06 1995-11-07 Ford Motor Company Fuel controller with an adaptive adder
FR2775315B1 (fr) * 1998-02-25 2000-05-05 Magneti Marelli France Procede et dispositif d'autoadaptation rapide de richesse pour moteur a injection avec sonde d'oxygene dans les gaz d'echappement
US6497223B1 (en) 2000-05-04 2002-12-24 Cummins, Inc. Fuel injection pressure control system for an internal combustion engine
JP5287839B2 (ja) * 2010-12-15 2013-09-11 株式会社デンソー 燃料噴射特性学習装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3824967A (en) * 1972-10-30 1974-07-23 Gen Motors Corp Electronic fuel injection system
US4200064A (en) * 1977-04-27 1980-04-29 Fabbrica Italiana Magneti Marelli S.P.A. Electronic apparatus for feed control of air-gasoline mixture in internal combustion engines
US4201161A (en) * 1977-10-17 1980-05-06 Hitachi, Ltd. Control system for internal combustion engine
DE3310600A1 (de) * 1982-03-24 1983-09-29 Toyota Jidosha K.K., Toyota, Aichi Verfahren und vorrichtung zum regeln der brennstoffzufuhr einer brennkraftmaschine
US4467769A (en) * 1981-04-07 1984-08-28 Nippondenso Co., Ltd. Closed loop air/fuel ratio control of i.c. engine using learning data unaffected by fuel from canister

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3964443A (en) * 1973-05-25 1976-06-22 The Bendix Corporation Digital engine control system using DDA schedule generators
DE2961307D1 (en) * 1978-08-09 1982-01-14 Bosch Gmbh Robert Ignition and fuel injection control system for internal combustion engines
JPS5596339A (en) * 1979-01-13 1980-07-22 Nippon Denso Co Ltd Air-fuel ratio control method
US4375209A (en) * 1980-06-20 1983-03-01 Rca Corporation Digital timing system for spark advance
JPS5853184A (ja) * 1981-09-24 1983-03-29 東芝ライテック株式会社 器具内蔵形自動調光装置
JPS58104342A (ja) * 1981-12-16 1983-06-21 Toyota Motor Corp 内燃機関の空燃比制御方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3824967A (en) * 1972-10-30 1974-07-23 Gen Motors Corp Electronic fuel injection system
US4200064A (en) * 1977-04-27 1980-04-29 Fabbrica Italiana Magneti Marelli S.P.A. Electronic apparatus for feed control of air-gasoline mixture in internal combustion engines
US4201161A (en) * 1977-10-17 1980-05-06 Hitachi, Ltd. Control system for internal combustion engine
US4467769A (en) * 1981-04-07 1984-08-28 Nippondenso Co., Ltd. Closed loop air/fuel ratio control of i.c. engine using learning data unaffected by fuel from canister
DE3310600A1 (de) * 1982-03-24 1983-09-29 Toyota Jidosha K.K., Toyota, Aichi Verfahren und vorrichtung zum regeln der brennstoffzufuhr einer brennkraftmaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0349811A1 (de) * 1988-07-01 1990-01-10 Robert Bosch Gmbh Regelsystem für eine Brennkraftmaschine
EP0524575A3 (en) * 1991-07-26 1994-11-23 Weber Srl Adaptive electronic injection fuel delivery control system

Also Published As

Publication number Publication date
FR2567962A1 (fr) 1986-01-24
US4593666A (en) 1986-06-10
FR2567962B1 (fr) 1989-05-26
JPH0569972B2 (de) 1993-10-04
CA1229900A (fr) 1987-12-01
JPS61182437A (ja) 1986-08-15
DE3562942D1 (en) 1988-06-30
EP0175596B1 (de) 1988-05-25

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