EP0293571A2 - Procédé de régulation du rapport air-carburant d'un moteur à combustion - Google Patents

Procédé de régulation du rapport air-carburant d'un moteur à combustion Download PDF

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Publication number
EP0293571A2
EP0293571A2 EP88105140A EP88105140A EP0293571A2 EP 0293571 A2 EP0293571 A2 EP 0293571A2 EP 88105140 A EP88105140 A EP 88105140A EP 88105140 A EP88105140 A EP 88105140A EP 0293571 A2 EP0293571 A2 EP 0293571A2
Authority
EP
European Patent Office
Prior art keywords
jump
combustion engine
internal combustion
output voltage
measuring probe
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.)
Ceased
Application number
EP88105140A
Other languages
German (de)
English (en)
Other versions
EP0293571A3 (fr
Inventor
Helmut Fleischer
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.)
Mannesmann VDO AG
Original Assignee
Mannesmann VDO 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 Mannesmann VDO AG filed Critical Mannesmann VDO AG
Publication of EP0293571A2 publication Critical patent/EP0293571A2/fr
Publication of EP0293571A3 publication Critical patent/EP0293571A3/fr
Ceased 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
    • F02D41/1477—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

Definitions

  • the invention relates to a method for regulating the fuel-air ratio of an internal combustion engine, the output voltage of an oxygen measuring probe, which is arranged in the exhaust gas duct of the internal combustion engine, being fed to a controller and the controller issuing a manipulated variable for the fuel-air ratio.
  • the aim of regulating the fuel-air ratio in internal combustion engines is primarily to reduce harmful fractions of exhaust gas emissions from internal combustion engines.
  • a method is known with an oxygen measuring probe arranged in the exhaust gas flow of the internal combustion engine, which controls an integrating device, the output signal of the exhaust gas measuring probe being applied to a threshold value switch and switching over when the threshold value is reached, and with after the switching of the threshold switch, the integration direction of the integrating device is changed.
  • the time constant of the integrating device is changed as a function of at least one operating parameter of the internal combustion engine, in particular as a function of the intake air quantity of the internal combustion engine.
  • the integrating device with changeable time constant proposed in connection with the known method does not meet the requirements with regard to precise and adaptable regulation.
  • the method according to the invention is characterized in that corresponding signals are fed to the controller comprising a microprocessor, the load and the speed of the internal combustion engine are corresponding signals, that after a jump in the output voltage of the oxygen measuring probe there is a jump in the manipulated variable and that the manipulated variable is obtained by adding a predetermined value and an additional value is formed, that the additional value is derived in each case by multiplying a coefficient which is dependent on the load and on the speed by a counting variable and that the counting variable is set to 0 by the respective jump in the output voltage of the oxygen measuring probe.
  • a further development of the invention consists in that the coefficient in the event of a jump in the output voltage of the oxygen measuring probe is calculated from the signals then supplied, which correspond to the load and the speed, and is stored until the next jump. This saves on the one hand computing time and on the other hand enables in a simple manner that additional parameters when calculating the Manipulated variable can be taken into account.
  • a further improvement of the method according to the invention is possible in that the value of the jump is also dependent on the load and the speed of the internal combustion engine.
  • the oxygen measuring probe 1 is connected to the input of a multiplexer 2, the other input of which is supplied with a signal corresponding to the intake air quantity Q.
  • the output of the multiplexer 2 is connected to the input of an analog / digital converter 3, so that both the output voltage of the oxygen measuring probe 1 and the signal representing the intake air quantity Q are alternately converted into digital values.
  • an input / output unit 4 which is part of a microcomputer and is connected via a bus system 5 to a microprocessor 6, a read-only memory 7 and a read-write memory 8 that is.
  • the read-only memory 7 is used for permanent storage of the program, including the constants required for the execution of the program.
  • the variables created during the program run are stored in the read-write memory 8.
  • An input 9 of the microprocessor is supplied with a speed signal n, the frequency of which is proportional to the speed of the internal combustion engine. By counting the period of this signal, the speed n of the internal combustion engine is measured in a manner known per se and the result is stored in the read-write memory 8.
  • the manipulated variable calculated by the microprocessor is fed to the output 12 via the input / output unit 4, a digital / analog converter 10 and an output stage 11. Since the actuators normally used are driven by a current, the manipulated variable is designated by the formula symbol I in the exemplary embodiment shown.
  • the microcomputer shown in FIG. 1, including the multiplexer 2, the analog / digital converter 3 and the digital / analog converter 10, is available in various versions as a so-called one-chip microcomputer.
  • the determined value is output at 20 via the input / output unit 4 (FIG. 1).
  • the counter variable m is then increased by 1 at 21.
  • FIG. 3a shows the desired course of the time-dependent portion of the manipulated variable as a function of time.
  • the slope a of the straight line depends on the operating parameters of the internal combustion engine, in particular on the speed and the load, which is measured via the amount of air drawn in.
  • the diagram according to FIG. 3b) shows the course of the manipulated variable Im, clock periods of the microprocessor, which are denoted by the respective value of the counting variables, being plotted on the time axis.
  • the controller reacts with a signal jump Pi, which is followed by a time-linear course, which, however, is gradual due to the finite computing speed of the microcomputer.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
EP88105140A 1987-06-04 1988-03-30 Procédé de régulation du rapport air-carburant d'un moteur à combustion Ceased EP0293571A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3718720 1987-06-04
DE19873718720 DE3718720A1 (de) 1987-06-04 1987-06-04 Verfahren zur regelung des kraftstoff-luftverhaeltnisses einer brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP0293571A2 true EP0293571A2 (fr) 1988-12-07
EP0293571A3 EP0293571A3 (fr) 1989-01-25

Family

ID=6329046

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88105140A Ceased EP0293571A3 (fr) 1987-06-04 1988-03-30 Procédé de régulation du rapport air-carburant d'un moteur à combustion

Country Status (2)

Country Link
EP (1) EP0293571A3 (fr)
DE (1) DE3718720A1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3039436C3 (de) * 1980-10-18 1997-12-04 Bosch Gmbh Robert Regeleinrichtung für ein Kraftstoffzumeßsystem einer Brennkraftmaschine
JPS61169635A (ja) * 1985-01-23 1986-07-31 Hitachi Ltd 空燃比制御方法

Also Published As

Publication number Publication date
DE3718720A1 (de) 1988-12-22
EP0293571A3 (fr) 1989-01-25

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