EP0079570A2 - Appareil de régulation ou rapport air/carburant pour moteur à combustion interne - Google Patents

Appareil de régulation ou rapport air/carburant pour moteur à combustion interne Download PDF

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Publication number
EP0079570A2
EP0079570A2 EP82110341A EP82110341A EP0079570A2 EP 0079570 A2 EP0079570 A2 EP 0079570A2 EP 82110341 A EP82110341 A EP 82110341A EP 82110341 A EP82110341 A EP 82110341A EP 0079570 A2 EP0079570 A2 EP 0079570A2
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
air
flow meter
fuel
intake air
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
EP82110341A
Other languages
German (de)
English (en)
Other versions
EP0079570B1 (fr
EP0079570A3 (en
Inventor
Lorenz Dipl.-Ing. Salzer
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0079570A2 publication Critical patent/EP0079570A2/fr
Publication of EP0079570A3 publication Critical patent/EP0079570A3/de
Application granted granted Critical
Publication of EP0079570B1 publication Critical patent/EP0079570B1/fr
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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
    • 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
    • F02D41/1445—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 related to the exhaust flow
    • 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
    • F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
    • F02D41/1475—Regulating the air fuel ratio at a value other than stoichiometry
    • 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

Definitions

  • the invention relates to a control device for the air ratio of internal combustion engines, with an intake air flow meter, an exhaust gas sensor and a controller which variably controls the fuel throughput with the signals of the flow meter and the exhaust gas sensor according to the respective operating conditions.
  • the exhaust gas sensor is usually a so-called lambda probe, which responds to a component of the exhaust gas, here oxygen.
  • N a component of the exhaust gas
  • the lambda probe can only be used with unleaded fuel. This means that it cannot be used, for example, in Western Europe with the leaded fuel present there.
  • the invention has for its object to provide a control device of the type mentioned, with which the air ratio can be controlled to any value and regardless of the quality of the fuel or its additives.
  • the invention solves this problem in that the exhaust gas sensor is an exhaust gas flow meter.
  • the mass of fuel supplied can be determined using the mass flow ratios. In stationary operation or in non-stationary operation without taking phase shifts into account, it is the difference between the throughputs of exhaust gas and intake air.
  • the advantage of this computational method is that it enables exact determination of the fuel mass supplied to the combustion chamber, for example in fuel injection systems with fuel return.
  • the actual air ratio can be determined in the usual way and compared with a target value stored, for example, in characteristic diagrams. In the event of deviations, a correction signal for the fuel metering device can easily be obtained.
  • An schematically illustrated internal combustion engine 1 receives its intake air via an intake duct 2, into which an injection nozzle 3 introduces fuel.
  • the exhaust gases are discharged via an exhaust duct 4.
  • a mass meter 5 or 6 which is designed in the usual way as a hot wire, vortex or ultrasonic transmitter, and which has a signal s L or m A proportional to the respective mass flow rate m L or m A s A delivers.
  • the output signals of the mass meters 5 and 6 are summed in an integrator 7 and 8, respectively.
  • the time base of the two integrators 7 and 8 is selected to be equal to the duration of a crankshaft revolution.
  • a corresponding signal for this is obtained with the aid of an inductive pickup 9, which responds to a marking 10 of a vibration damper 11 of the internal combustion engine 1.
  • the output signals S L and S A of the two integrators 7 and 8 correspond to the intake and exhaust gas (mass) throughput per crankshaft revolution of the internal combustion engine.
  • the phase delay of the exhaust gas with respect to the intake air caused by the running time is additionally taken into account by a corresponding delay in the pulse signal 12 of a time base generator 13 that controls the operation of the integrator 8 compared to the corresponding pulse signal 14 for the integrator 7.
  • the relationship between the speed-proportional signal of the transducer 9 and the two pulse signals 12 and 14 is shown schematically within the generator 13.
  • the air ratio ⁇ can now be calculated with the aid of the in-phase signals S L and S A.
  • the mass flow ratios are used, which are shown in the drawing as equation I.
  • a signal corresponding to the quantity m A is in the form of the signal S A.
  • a corresponding signal for the quantity m L is the signal S Lt.
  • the difference between these two values is proportional to the value ⁇ K , that is to say the fuel throughput.
  • the proportionality constant assuming the integrators 7 and 8 operate in the same way, is the same for the three values of equation I.
  • the air ratio ⁇ can be obtained by using the corresponding output signals of the integrator 7 or, in the case of the fuel throughput, the difference in the output signals in the equation II likewise given in the drawing, instead of the values for air or fuel throughput used there of the two integrators 8 and 7 is set. Since the in the denominator of the Fractional fraction is a constant dependent on the fuel quality, the air ratio of the mixture actually supplied to the internal combustion engine is thus obtained directly by correspondingly converting the output signals of the two integrators 7 and 8 in accordance with equation II in a computing circuit 15.
  • the value obtained for is for the air ratio of the mixture actually supplied to the internal combustion engine is input into a setpoint comparator 16, which is connected to a setpoint memory 17.
  • the setpoints of the air ratio ⁇ are stored in the memory 17 as characteristic maps.
  • the target value comparator 16 supplies a correction signal ⁇ S k for a control device 18 which controls the injection valve 3. In this way it is possible to correct the initially selected control signal S for the injection valve 3 according to the actual requirements and to set it to the correct value.

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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)
EP82110341A 1981-11-13 1982-11-10 Appareil de régulation ou rapport air/carburant pour moteur à combustion interne Expired EP0079570B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3145235 1981-11-13
DE3145235A DE3145235C1 (de) 1981-11-13 1981-11-13 Regeleinrichtung fuer die Luftzahl von Brennkraftmaschinen

Publications (3)

Publication Number Publication Date
EP0079570A2 true EP0079570A2 (fr) 1983-05-25
EP0079570A3 EP0079570A3 (en) 1984-12-05
EP0079570B1 EP0079570B1 (fr) 1987-01-14

Family

ID=6146374

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82110341A Expired EP0079570B1 (fr) 1981-11-13 1982-11-10 Appareil de régulation ou rapport air/carburant pour moteur à combustion interne

Country Status (2)

Country Link
EP (1) EP0079570B1 (fr)
DE (2) DE3145235C1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0261473A1 (fr) * 1986-09-03 1988-03-30 Hitachi, Ltd. Méthode de commande de moteur spécifique relative aux cylindres
FR2624965A1 (fr) * 1987-12-21 1989-06-23 Bosch Gmbh Robert Dispositif d'exploitation pour le signal de mesure d'une sonde lambda, disposee dans les gaz d'echappement d'un moteur a combustion interne, exempt de perturbation
WO1991012422A1 (fr) * 1990-02-08 1991-08-22 Robert Bosch Gmbh Procede d'attribution de defauts de combustion a un cylindre de moteur a combustion interne

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2001871A1 (fr) * 1968-02-14 1969-10-03 Daimler Benz Ag
FR2119155A5 (fr) * 1970-12-22 1972-08-04 Brev Etudes Sibe
US4003350A (en) * 1974-10-10 1977-01-18 Robert Bosch G.M.B.H. Fuel injection system
US4005689A (en) * 1975-04-30 1977-02-01 The Bendix Corporation Fuel injection system controlling air/fuel ratio by intake manifold gas sensor
US4130095A (en) * 1977-07-12 1978-12-19 General Motors Corporation Fuel control system with calibration learning capability for motor vehicle internal combustion engine
FR2455681A1 (fr) * 1979-05-01 1980-11-28 Bendix Corp Systeme electronique de commande perfectionne du rapport air/combustible d'un moteur a combustion interne

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2407859A1 (de) * 1973-02-20 1974-08-22 Lucas Electrical Co Ltd Kraftstoffregelsystem
DE2702863C2 (de) * 1977-01-25 1986-06-05 Robert Bosch Gmbh, 7000 Stuttgart Verfahren und Vorrichtung zur Regelung der Gemischverhältnisanteile des einer Brennkraftmaschine zugeführten Betriebsgemischs

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2001871A1 (fr) * 1968-02-14 1969-10-03 Daimler Benz Ag
FR2119155A5 (fr) * 1970-12-22 1972-08-04 Brev Etudes Sibe
US4003350A (en) * 1974-10-10 1977-01-18 Robert Bosch G.M.B.H. Fuel injection system
US4005689A (en) * 1975-04-30 1977-02-01 The Bendix Corporation Fuel injection system controlling air/fuel ratio by intake manifold gas sensor
US4130095A (en) * 1977-07-12 1978-12-19 General Motors Corporation Fuel control system with calibration learning capability for motor vehicle internal combustion engine
FR2455681A1 (fr) * 1979-05-01 1980-11-28 Bendix Corp Systeme electronique de commande perfectionne du rapport air/combustible d'un moteur a combustion interne

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0261473A1 (fr) * 1986-09-03 1988-03-30 Hitachi, Ltd. Méthode de commande de moteur spécifique relative aux cylindres
FR2624965A1 (fr) * 1987-12-21 1989-06-23 Bosch Gmbh Robert Dispositif d'exploitation pour le signal de mesure d'une sonde lambda, disposee dans les gaz d'echappement d'un moteur a combustion interne, exempt de perturbation
WO1991012422A1 (fr) * 1990-02-08 1991-08-22 Robert Bosch Gmbh Procede d'attribution de defauts de combustion a un cylindre de moteur a combustion interne

Also Published As

Publication number Publication date
EP0079570B1 (fr) 1987-01-14
EP0079570A3 (en) 1984-12-05
DE3145235C1 (de) 1983-07-21
DE3275111D1 (en) 1987-02-19

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