EP0146426A1 - Verfahren für die Steuerung eines Motors mit durch Lambdasonde regulierter Kraftstoffeinspritzung und gesteuerter Zündung - Google Patents

Verfahren für die Steuerung eines Motors mit durch Lambdasonde regulierter Kraftstoffeinspritzung und gesteuerter Zündung Download PDF

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Publication number
EP0146426A1
EP0146426A1 EP84402175A EP84402175A EP0146426A1 EP 0146426 A1 EP0146426 A1 EP 0146426A1 EP 84402175 A EP84402175 A EP 84402175A EP 84402175 A EP84402175 A EP 84402175A EP 0146426 A1 EP0146426 A1 EP 0146426A1
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EP
European Patent Office
Prior art keywords
engine
temporary
enrichment
injection time
nominal
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
EP84402175A
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English (en)
French (fr)
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EP0146426B1 (de
Inventor
Rémi Lefevre
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 SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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Filing date
Publication date
Application filed by Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of EP0146426A1 publication Critical patent/EP0146426A1/de
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Publication of EP0146426B1 publication Critical patent/EP0146426B1/de
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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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/10—Introducing corrections for particular operating conditions for acceleration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D37/00—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for
    • F02D37/02—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for one of the functions being ignition
    • 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
    • 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

Definitions

  • the present invention relates to a method for controlling a fuel injection and spark-ignition engine by means of an electronic computer coupled to a probe for detecting the oxygen content of the exhaust gases, hereinafter called probe / ⁇ .
  • the probe A is an all-or-nothing sensor whose output voltage is either higher or lower than a certain threshold depending on whether the oxygen content of the exhaust gases is lower or higher than a predetermined value.
  • This oxygen content of the exhaust gases is itself an image of the mixture of air and fuel admitted into the engine: a lean mixture generates an excess of oxygen in the exhaust gases and a rich mixture a deficit of oxygen, the threshold of the probe A corresponding to the stoichiometric ratio.
  • Such a probe A can thus be used in combination with an injection computer to measure the air / fuel mixture admitted into the engine as a function of the oxygen content of the exhaust gases.
  • This regulation makes it possible in particular to reduce the emissions of toxic components from spark-ignition engines as required by national regulations in a certain number of countries.
  • Another advantage of such regulation by probe lies in the possibility of operating the engine in a lean mixture, at least in certain areas of its operating range, in order to minimize fuel consumption and reduce carbon monoxide and unburnt hydrocarbon emissions.
  • the invention aims to solve this problem and, for this purpose, it relates to a method for controlling a fuel injection engine and controlled ignition equipped with an electronic injection and ignition computer coupled to a detection probe.
  • the oxygen content of the exhaust gases according to which a nominal advance advance angle is developed as a function of the engine operating parameters which is temporarily reduced in certain operating conditions of the engine and a nominal injection time corresponding to a low-fuel dosage of the fuel mixture and a temporary enrichment of said mixture is periodically caused by an increase in injection time, characterized in that, in response to said temporary enrichment , said temporary reduction in the angle of advance at nominal ignition is caused and in that the amplitude of the reduction in the angle of advance at ignition is proportional to said nominal angle of advance and depends on the value of the temporary increase in injection time.
  • the temporary advance reduction is generated a predetermined number of engine revolutions after the start of the temporary enrichment.
  • a positive-ignition engine 1 comprises an intake pipe 2, in which an injector 3 is arranged downstream of a throttle valve 4, and an exhaust pipe 5, The time
  • a digital computer 6 which receives from a pressure sensor 7 information relating to the air pressure in the supply line intake 2 and a speed sensor 8 information relating to the speed of rotation of the engine 1.
  • the sensor 8 is associated with a toothed target 9 integral in rotation with the crankshaft (not shown) of the engine 1 and some of whose teeth have been suppressed the output signal from the sensor 8 is thus used by the computer 6 to determine both the speed and the angular position of the crankshaft as described in patent FR-A- 79.00 386.
  • the computer 6 also receives the signals from output of a probe A 10 arranged in the exhaust pipe 5 and of a temperature sensor 11 disposed in the cooling water circuit 12 of the engine 1.
  • the computer 6 also develops the ignition advance angle as a function of the engine speed and load parameters and controls the instant of ignition of the mixture in a cylinder 13 of the engine by a spark plug 14.
  • the computer 6 has in memory a map making it possible to calculate the injection time as a function of the speed and of the engine load.
  • This mapping corresponds to a basic injection time TIo determining an operation of the engine in lean mixture.
  • the speed and the load of the engine, and therefore the basic injection time TIo are assumed to be constant.
  • the computer 6 causes an additional enrichment of the mixture by increasing the injection time by a value b during a number of engine revolutions a.
  • the quantities a and b are calculated so that, at the operating point considered, the probe A is at the limit of tilting.
  • the basic injection time is reduced by a small amount and, if not, it is increased by an equally small amount, which leads to a nominal injection time TIn different from the basic time TIo.
  • this temporary enrichment (a, b) tends to generate an increase in torque which, in accordance with the invention, is compensated by an equally temporary reduction in the angle of advance on ignition.
  • this comprises in memory an addressable advance map as a function of the pressure and the engine speed and generates a basic advance angle Avo.
  • the advance angle Avo is reduced by an amount e during a number of revolutions f.
  • the values of a, b, c, d, e, f and g depend on the type of injection system and on the characteristics of the engine considered.
  • the duration of the advance enrichment and blurring slots (a, f) can be fixed because the injectors deliver the fuel directly on the intake valves.
  • the duration of the slots enrichment and advance blurring should then preferably depend on the engine operating point, which can be achieved by memorization, of a specific mapping in the digital advance and injection computer 6.
  • the amplitude b of the enrichment slot is preferably inversely proportional to the nominal richness, that is to say to the nominal injection time, for the considered operating point of the engine, while the value e of the Advance shading is preferably proportional to the amplitude b of the enrichment window.
  • the phase shift g between the enrichment slot and the advance dimming slot can be either fixed, or a function of the engine load and speed. The same goes for the repetition period d of the temporary enrichment process and for the number of revolutions c at the end of which the condition of the probe is examined. If a is fixed, it is preferably also, but if a depends on the load and the engine speed, c can either depend on the same parameters, or be a predetermined number of turns counted from the end of the slot. enrichment.
  • the regulation by temporary enrichment and blurring described above may only be carried out in certain engine operating zones. This type of regulation will preferably be avoided in the field of high loads (rich mixture), low loads (deceleration zones) and low speeds (stability problems). This regulation should preferably also be prohibited during transient or cold operations because of deceleration cuts and acceleration and cold enrichments that can be expected and that the regulation described would disturb.
  • FIG. 3 precisely illustrates an embodiment of the invention which eliminates regulation by temporary enrichment and blurring in advance in the above-mentioned operating zones.
  • the values of a, c, d, f and g will be assumed to be fixed.
  • the response to at least one of tests 21 to 24 is negative and we pass to test 25.
  • the state of the probe ⁇ used as a looping criterion for an injection system programmed to operate in lean mixture, is used so as to periodically make the mixture generated tend to the stoichiometric report.
  • This results in changes to the programmed base injection time which provide self-adaptive control of the nominal wealth for each engine operating point programmed in the computer mapping, which overcomes variations in characteristics due to engine aging.
  • This regulation is made acceptable in its application on a motor vehicle by the fact that the excess torque normally generated by the periodic enrichment is considerably attenuated by the periodic blurring in advance carried out.

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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)
EP84402175A 1983-11-04 1984-10-30 Verfahren für die Steuerung eines Motors mit durch Lambdasonde regulierter Kraftstoffeinspritzung und gesteuerter Zündung Expired EP0146426B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8317538 1983-11-04
FR8317538A FR2554509B1 (fr) 1983-11-04 1983-11-04 Procede de commande d'un moteur a injection de carburant regulee par sonde l et a allumage commande

Publications (2)

Publication Number Publication Date
EP0146426A1 true EP0146426A1 (de) 1985-06-26
EP0146426B1 EP0146426B1 (de) 1988-05-11

Family

ID=9293783

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84402175A Expired EP0146426B1 (de) 1983-11-04 1984-10-30 Verfahren für die Steuerung eines Motors mit durch Lambdasonde regulierter Kraftstoffeinspritzung und gesteuerter Zündung

Country Status (3)

Country Link
EP (1) EP0146426B1 (de)
DE (1) DE3471131D1 (de)
FR (1) FR2554509B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3878932T2 (de) * 1988-12-10 1993-08-26 Bosch Gmbh Robert Adaptive gemischregelung bei einspritzsystemen zur anreicherung in der beschleunigungsphase.
FR2721653A1 (fr) * 1994-06-27 1995-12-29 Siemens Automotive Sa Procédé et dispositif de réduction des émissions de polluants d'un moteur à combustion interne.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0007998A1 (de) * 1978-08-08 1980-02-20 Robert Bosch Gmbh Verfahren und Vorrichtung zur wenigstens teilweisen Unterbrechung der Kraftstoffzufuhr bei vorzugsweise in Fahrzeugen eingebauten Brennkraftmaschinen im Schiebebetrieb
DE2852715B1 (de) * 1978-12-06 1980-06-19 Volkswagenwerk Ag Verfahren zum Betrieb einer Brennkraftmaschine und Brennkraftmaschine zur Durchfuehrung des Verfahrens
GB2047439A (en) * 1979-04-06 1980-11-26 Nissan Motor Air-fuel ratio control system for internal combustion engines
FR2465887A1 (fr) * 1979-08-02 1981-03-27 Fuji Heavy Ind Ltd Dispositif de commande du rapport air-combustible pour un moteur a combustion interne
EP0042163A2 (de) * 1980-06-14 1981-12-23 Robert Bosch Gmbh Verfahren zur Steuerung der Kraftstoffzumessung und des Zündzeitpunkts einer Brennkraftmaschine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1081383B (it) * 1977-04-27 1985-05-21 Magneti Marelli Spa Apparecchiatura elettronica per il controllo dell'alimentazione di una miscela aria/benzina di un motore a combustione interna
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
EP0007998A1 (de) * 1978-08-08 1980-02-20 Robert Bosch Gmbh Verfahren und Vorrichtung zur wenigstens teilweisen Unterbrechung der Kraftstoffzufuhr bei vorzugsweise in Fahrzeugen eingebauten Brennkraftmaschinen im Schiebebetrieb
DE2852715B1 (de) * 1978-12-06 1980-06-19 Volkswagenwerk Ag Verfahren zum Betrieb einer Brennkraftmaschine und Brennkraftmaschine zur Durchfuehrung des Verfahrens
GB2047439A (en) * 1979-04-06 1980-11-26 Nissan Motor Air-fuel ratio control system for internal combustion engines
FR2465887A1 (fr) * 1979-08-02 1981-03-27 Fuji Heavy Ind Ltd Dispositif de commande du rapport air-combustible pour un moteur a combustion interne
EP0042163A2 (de) * 1980-06-14 1981-12-23 Robert Bosch Gmbh Verfahren zur Steuerung der Kraftstoffzumessung und des Zündzeitpunkts einer Brennkraftmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, vol. 7, no. 207(M-242)[1352], 13 septembre 1983, page 70M242; & JP - A - 58 104 342 (TOYOTA JIDOSHA KOGYO K.K.) 21-06-1983 *

Also Published As

Publication number Publication date
DE3471131D1 (en) 1988-06-16
FR2554509A1 (fr) 1985-05-10
FR2554509B1 (fr) 1988-03-18
EP0146426B1 (de) 1988-05-11

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