EP0352705A1 - Procédé de régulation de la richesse d'un mélange air-carburant d'alimentation d'un moteur à combustion interne, du type boucle fermée, sans exploitation de mesure physique de richesse - Google Patents

Procédé de régulation de la richesse d'un mélange air-carburant d'alimentation d'un moteur à combustion interne, du type boucle fermée, sans exploitation de mesure physique de richesse Download PDF

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Publication number
EP0352705A1
EP0352705A1 EP89113602A EP89113602A EP0352705A1 EP 0352705 A1 EP0352705 A1 EP 0352705A1 EP 89113602 A EP89113602 A EP 89113602A EP 89113602 A EP89113602 A EP 89113602A EP 0352705 A1 EP0352705 A1 EP 0352705A1
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EP
European Patent Office
Prior art keywords
fuel
air ratio
correction
engine
process according
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
EP89113602A
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German (de)
English (en)
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EP0352705B1 (fr
Inventor
Mariano Sans
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0352705A1 publication Critical patent/EP0352705A1/fr
Application granted granted Critical
Publication of EP0352705B1 publication Critical patent/EP0352705B1/fr
Expired legal-status Critical Current

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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
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
    • F02D41/1458—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio with determination means using an estimation
    • 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
    • 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
    • F02D2041/1433—Introducing closed-loop corrections characterised by the control or regulation method using a model or simulation of the system

Definitions

  • the present invention relates to a process for regulating the fuel to air ratio of an air/fuel mixture feeding an internal-combustion engine and, more particularly, to such a process of the "closed-loop" type, without the working of any physical fuel to air ratio measurement, designed to replace a process for the closed-loop regulation of such an engine from the signal supplied by an oxygen sensor placed in the exhaust gases of this engine, as a result of a temporary or permanent failure of this sensor.
  • French patent application No. 88 10114 filed on 27th July 1988 and entitled "Process and device for regulating the fuel to air ratio of an air/fuel mixture feeding an internal-combustion engine” describes a process for the closed-loop regulation of fuel to air ratio which works a signal supplied by an oxygen sensor placed in the exhaust gases of the engine and which makes it possible to control the frequency and amplitude of the oscillations of the fuel to air ratio completely by making these independent of the speed of the engine.
  • the process employs a law of regulation of fuel to air ratio having a recurrent nature, that is to say depending on the prior states of the fuel to air ratio measurements and the values of the preceding corrections of the opening time of the injectors.
  • An object of the present invention is, therefore, to provide a process for regulating the fuel to air ratio of an air/fuel mixture feeding an internal-combustion engine, designed to function in the absence of fuel to air ratio information supplied by an oxygen sensor placed in the exhaust gases of the engine. This process will then be able to function independently or replace a fuel to air ratio-regulating process utilizing this fuel to air ratio information, in the event of a temporary or permanent failure of this oxygen sensor.
  • Another object of the present invention is to provide such a process capable of ensuring a continuous control of the fuel to air ratio of the mixture from a nominal fuel to air ratio value which can be different from that corresponding to the stoichiometry, under some driving conditions.
  • Yet another object of the present invention is to provide such a process which is effectively protected from disturbances and which allows the use of corrections distributed according to the type of corrections, so as to reduce the calculation time for these corrections.
  • the measurement ⁇ n of the sampled signal representing the dynamic correction of the injection time is of the form: where y and are constants adjusted as a function of the dynamics desired for the regulation, ê n and ê n-1 are the measurements of the estimated fuel to air ratio differences at the moments of sampling n and n-1.
  • the measurement ⁇ n of the sampled signal representing the dynamic correction of the injection time is of the form: where ⁇ , ⁇ , go, g1, g 2 are constants adjusted as a function of the dynamics desired for the regulation, ê n , ê n-1 , ê n-2 are measurements of the estimated fuel to air ratio differences of the moments of sampling n, n-1 and n-2.
  • the static injection time n to which the dynamic correction ⁇ n is added, itself introduces an estimated value of the steady-state injection control with corrections attributable to certain operating conditions of the engine: correction of idling, of the recoupling of an air compressor or other auxiliary appliance, of altitude, etc.
  • Corrections can also be applied to the static gain of the model of the response of the engine, to take into account some operating parameters of the engine, namely speed, intake pressure, temperature of the air, of the coolant, etc.
  • the process according to the invention cannot utilize a signal representing the actual fuel to air ratio of the air/fuel mixture, such as that supplied by an oxygen sensor, currently called a “lambda sensor", placed in the exhaust gases of the engine.
  • the fuel to air ratio measurement which can be obtained from the signal supplied by an oxygen sensor, is replaced by an estimation of this fuel to air ratio and a substitution of this estimation for the fuel to air ratio measurement normally supplied by the sensor in a regulating process operating by closed loop, so as to preserve the advantages afforded by such functioning in terms of stability and dynamics. It is, in fact, a "pseudo-regulation" by closed loop, since the fuel to air ratio measurement used is not a physical measurement, but merely an estimation calculated from a modelling of the process, as will be described in more detail later.
  • the present invention makes use of a reference model representing the dynamic relation between the fuel to air ratio of the mixture and an opening time (or duration) of a fuel injector used to compose the air/fuel mixture burnt in an internal-combustion engine M, the fuel to air ratio of this mixture being regulated by means of the process according to the invention.
  • the corrector C used is a digital corrector.
  • the modelling of the engine makes it necessary to determine a dynamic model (p), such that: where Gs is the static gain of the model in the stabilized state, Md(p) characterizes the dynamics of the response of the fuel to air ratio R as a function of the control signal ti, and p is the La- place operator (sometimes referred to as s in English speaking countries.
  • the model Md(Z) is thus a recurrent model which makes it possible to estimate the instantaneous fuel to air ratio at the moment of sampling n as a function of the effective injection time Ti n : thus giving the sampled fuel to air ratio difference:
  • a catalytic converter is associated with the engine in order to treat the exhaust gases, it is known that a proper functioning of this catalytic converter requires an oscillation of the fuel to air ratio of the mixture.
  • a periodic variation as a function of the time of the nominal fuel to air ratio Rc is programmed in the form of a square-wave signal, for example alternating on either side of the desired mean value.
  • C(Z) denotes the Z-transform of the transfer function of the corrector C used in the present invention
  • n is the estimated static injection time which introduces possible corrections, such as:
  • Bench measurements of the fuel to air ratio of the mixture as a function of the injection time make it possible to identify the dynamic behaviour of the engine.
  • This correction is of the "fast" type, that is to say it is capable of changing at each calculation cycle or at each moment of sampling.
  • a correction of the injector ageing can also be introduced by adding a term 5K to the factor K, the estimated value of which then becomes:
  • the term go ao (Pr + po) of Gs can experience a "slow” altimetric correction ⁇ p alt and a "slow” self-adaptive correction on estimated value ⁇ 0 and p ⁇ of ao and of p o.
  • the corrected value: is then used.
  • a correction for example in the event of the coupling of an air compressor to the engine, can also be introduced by acting on the fuel to air ratio, in addition to that mentioned above, introduced by acting on the opening duration of the injector.
  • the total opening time of the injector can also include a term to, an "offset" correction representing a dead time in the injector control and a term st bat representing a variation in the electrical supply voltage of the injector, this voltage being supplied by the battery of the vehicle.
  • the total duration Ti of the opening control signal of the injector is expressed by the relation: with:
  • This process which is carried out by means of a law of recurrent control, is intended more particularly for replacing the regulating process described in the abovementioned patent application in the event of a failure in the oxygen sensor used, the latter process itself likewise being carried out by means of a law of recurrent control governing a sampled additive dynamic correction ⁇ n which is added to an estimated static injection time in order to establish an effective resulting injection time ti.
  • the regulating process according to the invention could be used independently or, in the event of a failure of an oxygen sensor, be associated with a regulating process other than that described in the abovementioned patent application.
  • the process according to the invention is closely complementary to the latter process in that they both employ recurrent laws of control which can be put into effect by calculation means of the same type.
  • the process according to the invention also has the advantage of allowing a continuous control of the fuel to air ratio from values below that corresponding to the stoichiometry up to values higher than this.
  • the recurrent law of control used is designed to preserve the dynamics and stability of the regulation, despite the presence of disturbances.
  • the corrections applied can be distributed according to the particular type (slow, fast, constant) and therefore made only at the appropriate time, thus achieving a saving of the calculation time for these corrections.

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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)
EP19890113602 1988-07-27 1989-07-24 Procédé de régulation de la richesse d'un mélange air-carburant d'alimentation d'un moteur à combustion interne, du type boucle fermée, sans exploitation de mesure physique de richesse Expired EP0352705B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8810114 1988-07-27
FR8810114A FR2634824B1 (fr) 1988-07-27 1988-07-27 Procede de regulation de la richesse d'un melange air-carburant d'alimentation d'un moteur a combustion interne, du type boucle fermee, sans exploitation de mesure physique de richesse

Publications (2)

Publication Number Publication Date
EP0352705A1 true EP0352705A1 (fr) 1990-01-31
EP0352705B1 EP0352705B1 (fr) 1992-06-17

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Family Applications (1)

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EP19890113602 Expired EP0352705B1 (fr) 1988-07-27 1989-07-24 Procédé de régulation de la richesse d'un mélange air-carburant d'alimentation d'un moteur à combustion interne, du type boucle fermée, sans exploitation de mesure physique de richesse

Country Status (4)

Country Link
EP (1) EP0352705B1 (fr)
DE (1) DE68901822T2 (fr)
ES (1) ES2032080T3 (fr)
FR (1) FR2634824B1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0445339A1 (fr) * 1990-03-09 1991-09-11 Siemens Aktiengesellschaft Système pour le contrôle du ralenti dans un moteur à combustion
FR2663989A1 (fr) * 1990-06-29 1992-01-03 Bosch Gmbh Robert Systeme de commande ou de reglage en combinaison avec un moteur a combustion interne et/ou un vehicule automobile, notamment pour la regulation du patinage de l'entrainement, dosage de l'air et dosage du carburant.
EP0553570A3 (fr) * 1991-12-27 1995-07-19 Honda Motor Co Ltd
EP0719930A3 (fr) * 1994-12-30 1999-04-07 Honda Giken Kogyo Kabushiki Kaisha Système de commande du dosage de carburant pour un moteur à combustion interne

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0115868A2 (fr) * 1983-02-04 1984-08-15 Nissan Motor Co., Ltd. Dispositif et procédé de commande d'alimentation en carburant d'un moteur à combustion interne

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5614836A (en) * 1979-07-13 1981-02-13 Hitachi Ltd Controlling device for internal combustion engine
JPS59126047A (ja) * 1982-12-30 1984-07-20 Mazda Motor Corp エンジンの空燃比制御装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0115868A2 (fr) * 1983-02-04 1984-08-15 Nissan Motor Co., Ltd. Dispositif et procédé de commande d'alimentation en carburant d'un moteur à combustion interne

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
G. MARRO: "Fondamenti di teoria dei sistemi", edition terza, 1979, pages 91-92,286-289, Patron Editore, Bologna, IT *
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 281 (M-520)[2337], 25th September 1986, page 72 M 520; & JP-A-61 101 653 (NIPPON DENSO CO., LTD) 20-05-1986 *
PATENT ABSTRACTS OF JAPAN, vol. 5, no. 61 (M-65)[733], 24th April 1981, page 118 M 65; & JP-A-56 14 836 (HITACHI SEISAKUSHO K.K.) 13-02-1981 *
PATENT ABSTRACTS OF JAPAN, vol. 8, no. 249 (M-338)[1686], 15th November 1984, page 130 M 338; & JP-A-59 126 047 (MAZDA K.K.) 20-07-1984 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0445339A1 (fr) * 1990-03-09 1991-09-11 Siemens Aktiengesellschaft Système pour le contrôle du ralenti dans un moteur à combustion
FR2663989A1 (fr) * 1990-06-29 1992-01-03 Bosch Gmbh Robert Systeme de commande ou de reglage en combinaison avec un moteur a combustion interne et/ou un vehicule automobile, notamment pour la regulation du patinage de l'entrainement, dosage de l'air et dosage du carburant.
EP0553570A3 (fr) * 1991-12-27 1995-07-19 Honda Motor Co Ltd
US5524598A (en) * 1991-12-27 1996-06-11 Honda Giken Kogyo Kabushiki Kaisha Method for detecting and controlling air-fuel ratio in internal combustion engine
EP0719930A3 (fr) * 1994-12-30 1999-04-07 Honda Giken Kogyo Kabushiki Kaisha Système de commande du dosage de carburant pour un moteur à combustion interne

Also Published As

Publication number Publication date
ES2032080T3 (es) 1993-01-01
DE68901822D1 (de) 1992-07-23
EP0352705B1 (fr) 1992-06-17
FR2634824B1 (fr) 1993-03-19
FR2634824A1 (fr) 1990-02-02
DE68901822T2 (de) 1992-12-17

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