EP0079570B1 - 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
EP0079570B1
EP0079570B1 EP82110341A EP82110341A EP0079570B1 EP 0079570 B1 EP0079570 B1 EP 0079570B1 EP 82110341 A EP82110341 A EP 82110341A EP 82110341 A EP82110341 A EP 82110341A EP 0079570 B1 EP0079570 B1 EP 0079570B1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
throughput
air
fuel
mass
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.)
Expired
Application number
EP82110341A
Other languages
German (de)
English (en)
Other versions
EP0079570A3 (en
EP0079570A2 (fr
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 flow rate according to the respective operating conditions with the signals of the flow meter and the exhaust gas sensor.
  • the exhaust gas sensor is usually a so-called lambda probe which responds to a component of the exhaust gas, here oxygen.
  • a component of the exhaust gas here oxygen.
  • Such a probe shows the air ratio, that is to say the ratio of the amount of air supplied to the amount of air required for stoichiometric combustion, of 1, that is to say a stoichiometric mixture, a characteristic jumping behavior.
  • the air ratio S it is only possible to regulate the air ratio S to the value 1 using the lambda probe.
  • consumption-optimized designs require air ratio values that are significantly higher than 1, i.e. around 1.2 to 1.4.
  • the lambda probe can only be used with unleaded fuel. This eliminates use, 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 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 also enables, for example in fuel injection systems with a fuel return, an exact determination of the fuel mass supplied to the combustion chamber.
  • 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.
  • the time bases of the intake air and exhaust gas flow meters be approximately equal to the duration of one To select crankshaft rotation.
  • 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 supplies a signal s L or s A proportional to the respective mass flow rate m L and m A .
  • 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 crank rotation.
  • 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 assumed, which are shown in the drawing as equation 1.
  • 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 L.
  • the difference between these two values is proportional to the value -m 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 1.
  • 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 11 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 fraction in the Henner des fraction is a constant that depends on the fuel quality, the air ratio of the mixture actually supplied to the internal combustion engine is obtained directly by correspondingly converting the output signals of the two integrators 7 and 8 in accordance with equation 11 in a computing circuit 15.
  • the value thus obtained for ⁇ for the air ratio of the internal combustion engine actually supplied mixture is input to a target value to comparator 16, which communicates with a set-value memory 17 in connection.
  • the setpoints of the air ratio X are stored in the memory 17 as characteristic maps in accordance with the operating conditions of the internal combustion engine.
  • the target value comparator 16 supplies a correction signal AS 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 k for the injection valve 3 in accordance with the actual requirements and to set it to the correct 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)

Claims (3)

1°) Appareil de régulation du coefficient d'air de moteur à combustion interne comportant un débitmètre massique (5) pour l'air aspiré, un capteur massique de gaz d'échappement (6) et un organe de régulation qui règle de façon variable le débit de carburant à l'aide des signaux fournis par le débitmètre massique (5) et le capteur de gaz d'échappement (6) suivant les conditions de fonctionnement respectives, caractérisé en ce que le capteur de gaz d'échappement est un débitmètre massique de gaz d'échappement et le carburant est déterminé à l'aide d'un régulateur électronique partant de la différence des débits massiques d'air aspiré et de gaz d'échappement.
2°) Appareil de réqulation selon la revendication 1, caracterise en ce que les bases de temps des débitmètres massiques d'air aspiré et de gaz d'échappement (5, 6) sont sensiblement égales à la durée d'une rotation du vilebrequin.
3°) Appareil de régulation selon les revendications 1 ou 2, caracterise en ce que les signaux de sortie fournis par les débitmètres massiques d'air aspiré et de gaz d'échappement (5,6) sont déphasés sensiblement suivant la durée de circulation des masses de gaz entre les deux débitmètres.
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 EP0079570A2 (fr) 1983-05-25
EP0079570A3 EP0079570A3 (en) 1984-12-05
EP0079570B1 true 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)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2544353B2 (ja) * 1986-09-03 1996-10-16 株式会社日立製作所 エンジンの回転同期型制御方法
DE3743315A1 (de) * 1987-12-21 1989-06-29 Bosch Gmbh Robert Auswerteinrichtung fuer das messsignal einer lambdasonde
DE4003752A1 (de) * 1990-02-08 1991-08-14 Bosch Gmbh Robert Verfahren zum zuordnen von verbrennungsfehlern zu einem zylinder einer brennkraftmaschine

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1698205A1 (de) * 1968-02-14 1971-11-18 Daimler Benz Ag Verfahren und Einrichtung zur Abgasbestimmung bei Brennkraftmaschinen,insbesondere in Kraftfahrzeugen
FR2119155A5 (fr) * 1970-12-22 1972-08-04 Brev Etudes Sibe
DE2407859A1 (de) * 1973-02-20 1974-08-22 Lucas Electrical Co Ltd Kraftstoffregelsystem
DE2448306C2 (de) * 1974-10-10 1983-12-08 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzanlage
US4005689A (en) * 1975-04-30 1977-02-01 The Bendix Corporation Fuel injection system controlling air/fuel ratio by intake manifold gas sensor
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
US4130095A (en) * 1977-07-12 1978-12-19 General Motors Corporation Fuel control system with calibration learning capability for motor vehicle internal combustion engine
US4269156A (en) * 1979-05-01 1981-05-26 The Bendix Corporation Air/fuel ratio management system with calibration correction for manifold pressure differentials

Also Published As

Publication number Publication date
DE3275111D1 (en) 1987-02-19
EP0079570A3 (en) 1984-12-05
EP0079570A2 (fr) 1983-05-25
DE3145235C1 (de) 1983-07-21

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