EP0157004B1 - Lambda-geregeltes Gemischzumesssystem für eine Brennkraftmaschine - Google Patents

Lambda-geregeltes Gemischzumesssystem für eine Brennkraftmaschine Download PDF

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Publication number
EP0157004B1
EP0157004B1 EP84116240A EP84116240A EP0157004B1 EP 0157004 B1 EP0157004 B1 EP 0157004B1 EP 84116240 A EP84116240 A EP 84116240A EP 84116240 A EP84116240 A EP 84116240A EP 0157004 B1 EP0157004 B1 EP 0157004B1
Authority
EP
European Patent Office
Prior art keywords
control
combustion engine
metering system
component
amplitude
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
EP84116240A
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German (de)
English (en)
French (fr)
Other versions
EP0157004A2 (de
EP0157004A3 (en
Inventor
Albrecht Dipl.-Ing. Clement
Dieter Dipl.-Ing. Mayer
Ernest Dipl.-Ing. Wild
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to AT84116240T priority Critical patent/ATE47201T1/de
Publication of EP0157004A2 publication Critical patent/EP0157004A2/de
Publication of EP0157004A3 publication Critical patent/EP0157004A3/de
Application granted granted Critical
Publication of EP0157004B1 publication Critical patent/EP0157004B1/de
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
    • F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
    • F02D41/1474—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method by detecting the commutation time of the sensor
    • 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
    • F02D41/1477—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation circuit or part of it,(e.g. comparator, PI regulator, output)
    • F02D41/1483—Proportional component
    • 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
    • F02D41/1456—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 sensor output signal being linear or quasi-linear with the concentration of oxygen

Definitions

  • the invention relates to a mixture metering system for an internal combustion engine according to the preamble of the main claim.
  • a mixture metering system is known, for example, from DE-OS 31 24 676 or the corresponding US Pat. No. 4,442,817.
  • the mixture composition is precontrolled as a function of various operating parameters of the internal combustion engine, a superimposed lambda control having a corrective effect on these precontrol values.
  • the lambda control occurs Continuous vibration, the frequency of which is given by the dead time and the amplitude of which is given by the control parameters.
  • the general rule is that with increasing value of the control amplitude a faster correction of disturbances is guaranteed.
  • the internal combustion engine runs unevenly, which is due to the change in torque caused by the control.
  • undesirable exhaust gas peaks can occur, in particular during dynamic transition situations when the internal combustion engine is operating, due to excessive control vibrations.
  • a lambda control system is known from GB-A-2 007 407, in which the amplitude of the control oscillation can be limited to specific values.
  • operational amplifiers 108, 120 are used as threshold switches, which influence the integrator of the lambda control so that its output signal is kept constant (page 5, line 21) when a certain amplitude of the control oscillation is exceeded or undershot.
  • the control vibration is therefore only influenced to a limited extent by interrupting the further integration process from a certain height or amplitude.
  • phases with a constantly high or constantly low lambda value can occur within a control oscillation in this known lambda control device, which may not be desirable for reasons relating to exhaust gas technology.
  • US-A-4 145 999 discloses a lambda control system in which the integrator slope is influenced depending on the frequency of the control oscillation. Naturally, this solution completely disregards the amplitude of the control oscillation, so that the actual conditions are not taken into account in the lambda control. However, this is essential with regard to a mixture control based on the actual conditions.
  • the mixture metering system according to the invention for an internal combustion engine with the features of the main claim, on the other hand, allows a considerably reduced application effort, since the system automatically adapts to sample variations from engine to engine, from lambda probe to lambda probe and to long-term changes in engine and probe. Furthermore, the mixture metering system according to the invention finds an optimal compromise between the running behavior of the internal combustion engine and the exhaust gas emission.
  • control oscillation has equal amplitude values of the P and I components in the steady state. This ensures that the control frequency of the lambda control assumes an optimal value.
  • FIG. 1 shows a basic illustration of an electronically controlled mixture metering system for an internal combustion engine
  • FIG. 2 shows a rough overview of a lambda control with a microcomputer
  • FIGS. 3a to c show the output signals of a lambda controller according to the prior art
  • FIG. 4 shows a controller as a block diagram for the mixture metering system according to the invention
  • FIG. 5 the output signals of the controllers of FIG.
  • 10 denotes a timing element that receives input signals from a load sensor 11 and from a speed sensor 12 and outputs pilot values of duration tp for the injection pulses on the output side.
  • a correction stage 13 in which the pilot control values are influenced as a function of, for example, the internal combustion engine temperature or acceleration processes and in particular as a function of a lambda control.
  • the one with t ; Corrected pulses designated are finally supplied to at least one injection valve 14 in the area of the intake manifold of the internal combustion engine, not shown.
  • An exhaust gas probe denoted by 15 emits its output signal to a controller 16, preferably having a PI behavior.
  • a lambda correction signal F r is formed in this, also as a function of further internal combustion engine parameters supplied via a control input 17, and is fed as an input signal to the correction stage 13.
  • This basic arrangement shown in FIG. 1 is already known as such and is essentially intended to explain the actual invention.
  • 20 denotes an arithmetic logic unit which is coupled via a data, control and address bus 21 to a memory 22 and to an input / output unit 23.
  • this block 23 is supplied with various input variables I k, and in addition it outputs various output variables O k .
  • B an injection period. The functioning of this arrangement according to FIG. 2 depends crucially on the computer programming.
  • the diagrams in FIG. 3 serve to explain the functioning of mixture metering systems in accordance with the prior art.
  • the lambda correction signal F r which influences the pilot control values for the injection quantity, is plotted as a function of the time t, represented in arbitrary units.
  • the signal form consists of an I component and a P component.
  • the output variable of the exhaust gas probe used in the present exemplary embodiment which is designed in particular as an oxygen probe, assumes essentially only two values, namely a high output level for a rich air-fuel mixture and a low output level for a lean air-fuel mixture
  • the resulting signal form results of the correction factor F r as follows: If the output variable of the oxygen probe jumps from rich to lean or lean to rich, a P component at the output of the controller 16 becomes effective.
  • the integral behavior of the controller takes effect during the time the special signal remains in one of the two output states.
  • the time period in which an integral behavior of the controller is effective depends on the dead time behavior of the controlled system, which is essentially due to the gas throughput times through the internal combustion engine.
  • the mean value of the correction factor F r fluctuates by values F r > 1, which suggests that the pilot control value corresponds to an insufficient fuel quantity. It can also be seen from this example that an incorrect setting of the pilot control values does not lead to an increase in the control oscillation of the controller in the steady state.
  • the Amplitude components of the control oscillation of the correction factor F r which can be attributed to the P or I component, always take on the same values with a suitable choice and constant dead time in the steady state, whereby an optimal control frequency is achieved.
  • the flue gas fluctuations that occur should be taken into account, although here the buffer effect of a downstream catalytic converter largely averages out these fluctuations.
  • the upper limit for the amplitude of the control vibration is therefore determined either by the driving behavior or an upper threshold value for the exhaust gas emission.
  • the dimensioning of this value of the amplitude of the control oscillation is a mere routine work and presents no problems for him.
  • FIG. 4 shows an exemplary embodiment of the controller of the mixture metering system according to the invention.
  • the output signals of the exhaust gas probe 15 reach a comparison device 41, in which they are compared with a predetermined target value 42.
  • the result of this comparison operation serves as the input variable of the controller 16, the output signals F r of which serve to correct, for example, the injection duration.
  • the controller 16 consists of a P-channel 43 and an I-channel 44 connected in parallel with it, which is preceded by a correction stage 45.
  • the output signals of the exhaust gas probe 15 are also fed to two monoflop stages 46 and 47, which actuate two switches 48 and 49 on the output side.
  • the monoflop stage 46 is sensitive to the positive edges and the monoflop stage 47 to the negative edges of the output signal of the exhaust gas probe 15.
  • the output signal F r of the controller 16 is applied to the input of two sample and hold units 50 and 51, respectively.
  • the output signals of these sample and hold units 50 and 51, together with the signals of the P-channel 43 of the controller 16, reach a comparison stage 52.
  • the quotient is formed from the output signal of the comparison stage 52 and a predetermined target value 54.
  • This quotient is compared in a comparison stage 55 with a target value 56 and this result is fed to a multiplier stage 57 in addition to other variables.
  • the output variable of the multiplier 57 reaches a counter 59 via a V / F converter 60 and a switch 58.
  • the counting direction of the counter 59 depends on the respective position of the switch 58, this switch 58 each time the output variable of the exhaust gas probe changes on a flank 15 is operated.
  • the counter reading of the counter 59 influences the correction stage 45 and the multiplier stage 57.
  • the multiplier stage 57 can be supplied with a further variable G f . It proves to be useful in many applications, the correction stage 45 with signals from a load detection stage 61, the corresponding machine parameters such. B. O L , a, n or p are supplied to act.
  • the arrangement works as follows: by means of the sample and hold amplifiers 50, 51, the amplitudes of the control oscillation are stored at the switching points of the output variable of the exhaust gas probe 15. These values are formed in the comparison stage 52, so that the amplitude of the control oscillation is available at the output. The amplitude of the integral part alone To determine, the P component of the control oscillation is also subtracted in comparison stage 52. In various cases, it can prove to be advantageous to set the P component to be subtracted to be purely arithmetical, since this may reduce the computational effort.
  • a pre-control of the I component of the control oscillation depending on the load of the internal combustion engine can be carried out via a load detection stage 61, to which machine parameters such as the speed n, the throttle valve position a or the air flow rate Q are supplied.
  • a load detection stage 61 to which machine parameters such as the speed n, the throttle valve position a or the air flow rate Q are supplied.
  • the P component can assume asymmetrical values, ie the P value in the lean-rich jump can differ from that in the rich-lean jump in the output signal of the exhaust gas probe.
  • the slope of the I component for a new cycle can be determined from the slope of the I component of a previous cycle be calculated. With the relationship the relationship results for the change in the integrator slope ⁇ S
  • FIG. 5 shows the output signal F r of a controller in the mixture metering system of an internal combustion engine as a function of time.
  • time t A there is a sudden change in the pilot control value and the dead time of the control loop (combination of the effects of FIGS. 3a and 3b).
  • the system according to the invention achieves an adjustment of the integrator slope after approximately three oscillation cycles in such a way that the target amplitude of the control oscillation is reached.
  • the maximum control frequency can be achieved with this system according to the invention, since the amplitudes of the P and I components of the control oscillation are adjusted to values of equal size by adapting, in particular, the integrator slope, and the controller therefore always works at its optimum. Variations in specimens from one engine to another or one exhaust gas probe to another and long-term changes in the engine and exhaust gas probe are no longer of disadvantageous importance due to the adapting slope of the integrator.

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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)
  • Testing Of Engines (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
EP84116240A 1984-03-09 1984-12-22 Lambda-geregeltes Gemischzumesssystem für eine Brennkraftmaschine Expired EP0157004B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84116240T ATE47201T1 (de) 1984-03-09 1984-12-22 Lambda-geregeltes gemischzumesssystem fuer eine brennkraftmaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843408635 DE3408635A1 (de) 1984-03-09 1984-03-09 Lambda-geregeltes gemischzumesssystem fuer eine brennkraftmaschine
DE3408635 1984-03-09

Publications (3)

Publication Number Publication Date
EP0157004A2 EP0157004A2 (de) 1985-10-09
EP0157004A3 EP0157004A3 (en) 1986-10-15
EP0157004B1 true EP0157004B1 (de) 1989-10-11

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ID=6230002

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84116240A Expired EP0157004B1 (de) 1984-03-09 1984-12-22 Lambda-geregeltes Gemischzumesssystem für eine Brennkraftmaschine

Country Status (5)

Country Link
US (1) US4671244A (enrdf_load_stackoverflow)
EP (1) EP0157004B1 (enrdf_load_stackoverflow)
JP (1) JPS60190633A (enrdf_load_stackoverflow)
AT (1) ATE47201T1 (enrdf_load_stackoverflow)
DE (2) DE3408635A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2487542C2 (ru) * 2011-10-21 2013-07-20 Государственное научное учреждение Всероссийский научно-исследовательский институт защиты растений Российской академии сельскохозяйственных наук Энтомопатогенный биопрепарат для защиты растений от вредителей и способ его получения

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DE3644472A1 (de) * 1986-10-30 1988-07-07 Vdo Schindling Verfahren und schaltungsanordnung zur erkennung der betriebsbereitschaft einer sauerstoffmesssonde
JPH03134240A (ja) * 1989-10-18 1991-06-07 Japan Electron Control Syst Co Ltd 内燃機関の空燃比フィードバック制御装置
DE4024213A1 (de) * 1990-07-31 1992-02-06 Bosch Gmbh Robert Verfahren zur lambdaregelung einer brennkraftmaschine mit katalysator
DE4024212C2 (de) * 1990-07-31 1999-09-02 Bosch Gmbh Robert Verfahren zur stetigen Lambdaregelung einer Brennkraftmaschine mit Katalysator
US5282360A (en) * 1992-10-30 1994-02-01 Ford Motor Company Post-catalyst feedback control
DE9301777U1 (de) * 1993-02-10 1994-03-17 Siemens AG, 80333 München Gasanalysegerät zum Erfassen und Anzeigen der Abweichung des Luft-/Kraftstoffverhältnisses eines Gasgemisches von einem vorgegebenen Wert
US5363831A (en) * 1993-11-16 1994-11-15 Unisia Jecs Corporation Method of and an apparatus for carrying out feedback control on an air-fuel ratio in an internal combustion engine
DE102006009412A1 (de) * 2006-02-23 2007-08-30 Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg Solarmodulsystem mit Tragstruktur
US8347866B2 (en) * 2009-09-29 2013-01-08 GM Global Technology Operations LLC Fuel control system and method for more accurate response to feedback from an exhaust system with an air/fuel equivalence ratio offset
DE102010031654B4 (de) 2010-07-22 2023-10-05 Robert Bosch Gmbh Verfahren zum Betreiben einer Brennkraftmaschine
DE102011082641A1 (de) * 2011-09-14 2013-03-14 Robert Bosch Gmbh Verfahren und Vorrichtung zur Regelstreckenmodifikation

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GB1524670A (en) * 1974-10-21 1978-09-13 Nissan Motor Apparatus for controlling the air-fuel mixture ratio of internal combustion engine
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JPS5281435A (en) * 1975-12-27 1977-07-07 Nissan Motor Co Ltd Air fuel ratio controller
JPS52114826A (en) * 1976-03-22 1977-09-27 Toyota Motor Corp Feedback type electronic controller for a fuel injection type internal combustion engine
JPS52135923A (en) * 1976-05-08 1977-11-14 Nissan Motor Co Ltd Air fuel ratio control equipment
JPS589261B2 (ja) * 1976-09-24 1983-02-19 日産自動車株式会社 空燃比制御装置
US4167924A (en) * 1977-10-03 1979-09-18 General Motors Corporation Closed loop fuel control system having variable control authority
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DE3039436C3 (de) * 1980-10-18 1997-12-04 Bosch Gmbh Robert Regeleinrichtung für ein Kraftstoffzumeßsystem einer Brennkraftmaschine
DE3124676A1 (de) * 1981-06-24 1983-01-13 Robert Bosch Gmbh, 7000 Stuttgart Elektronisch gesteuertes kraftstoffzumesssystem
JPS5827857A (ja) * 1981-08-12 1983-02-18 Mitsubishi Electric Corp 空燃比制御方法
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US4528962A (en) * 1981-12-11 1985-07-16 Robert Bosch Gmbh Method and apparatus for lambda regulation in an internal combustion engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2487542C2 (ru) * 2011-10-21 2013-07-20 Государственное научное учреждение Всероссийский научно-исследовательский институт защиты растений Российской академии сельскохозяйственных наук Энтомопатогенный биопрепарат для защиты растений от вредителей и способ его получения

Also Published As

Publication number Publication date
JPH0544552B2 (enrdf_load_stackoverflow) 1993-07-06
EP0157004A2 (de) 1985-10-09
EP0157004A3 (en) 1986-10-15
US4671244A (en) 1987-06-09
JPS60190633A (ja) 1985-09-28
DE3480106D1 (en) 1989-11-16
ATE47201T1 (de) 1989-10-15
DE3408635A1 (de) 1985-09-12

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