EP0126953A2 - Procédé et dispositif de commande du mélange air/combustible fourni à un moteur - Google Patents

Procédé et dispositif de commande du mélange air/combustible fourni à un moteur Download PDF

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Publication number
EP0126953A2
EP0126953A2 EP84104396A EP84104396A EP0126953A2 EP 0126953 A2 EP0126953 A2 EP 0126953A2 EP 84104396 A EP84104396 A EP 84104396A EP 84104396 A EP84104396 A EP 84104396A EP 0126953 A2 EP0126953 A2 EP 0126953A2
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EP
European Patent Office
Prior art keywords
probe
mixture
threshold value
variable
readiness
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.)
Withdrawn
Application number
EP84104396A
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German (de)
English (en)
Other versions
EP0126953A3 (fr
Inventor
Werner Dipl.-Ing. Jundt
Rolf Reischl
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0126953A2 publication Critical patent/EP0126953A2/fr
Publication of EP0126953A3 publication Critical patent/EP0126953A3/fr
Withdrawn legal-status Critical Current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)
    • F02D41/148—Using a plurality of comparators

Definitions

  • the invention relates to a method and a device for carrying out the method for regulating the fuel - air ratio of the operating mixture supplied to an internal combustion engine using an oxygen probe (lambda probe) that is sensitive to the oxygen content of the burned operating mixture, with the oxygen probe output variable being a constant reference variable for detecting operational readiness superimposed, the resulting variable is supplied to at least two comparison devices which have different threshold values, and the output variables of this comparison device are processed further to detect the readiness for operation of the probe.
  • an oxygen probe lambda probe
  • Such a method and a device for carrying out this method is known for example from DE-PS 27 07 383.
  • an actual value determination of the mixture composition can be carried out and a corresponding control signal can be generated.
  • the output signals of the two comparison devices which monitor the resulting voltage from the oxygen probe output voltage and the constant reference voltage, serve as input information for a digital evaluation circuit which ensures that the oxygen probe is ready for operation.
  • German patent application P 31 49 136.7 also shows that the output voltage of the threshold switch with the smaller threshold is used to determine the running direction of the controller in the direction of a rich mixture or lean mixture.
  • the smaller threshold value voltage is therefore also referred to as the control threshold, since the sole comparison of the oxygen probe output voltage with this threshold value is sufficient to define the running direction of the controller.
  • this device possesses a property that results from the special course of the resulting voltage from the oxygen probe output voltage and the constant reference voltage as a function of the temperature. It can be seen that the lean bump of the oxygen probe EMF undergoes a shift towards the fatty touch at low temperatures.
  • control unit is always faked a value in the direction of fat, even when a lean mixture is present, and the operating mixture is increasingly emaciated until the control has reached the lean limit.
  • the inventive method for controlling the air-fuel ratio with the characterizing features of the main claim and the inventive device for carrying out the method for regulating the air-fuel ratio with the characterizing features of claim 5 has the advantage that the lean shift of the air-fuel mixture during the Warm-up phase is compensated and that the so-called "idle sawing" is largely avoided.
  • the essence of the invention is based on the knowledge that the use of the smaller threshold value as the switching threshold is particularly unfavorable and that it proves to be very useful to use the upper threshold value as the control threshold instead of the lower threshold value. Only when the upper threshold value is used as the control threshold does the special interaction between the control threshold and the temperature-dependent probe output voltage curve result in the effect according to the invention of compensating for the lean displacement of the warm-up phase.
  • FIG. 1 shows a highly simplified block diagram of an exemplary embodiment of the invention
  • FIG. 2 shows a diagram of the resulting voltage U A as a function of the temperature of the oxygen probe for the rich and lean branch (lambda ⁇ 1, lambda> 1)
  • FIG. 3 Diagram of the electromotive force U of the oxygen probe as a function of the temperature for the rich and lean rest
  • FIG. H a graph of the electromotive force U s of the oxygen probe as a function of lambda with the temperature T as a parameter.
  • 10 is the equivalent circuit diagram of an oxygen probe, as described in detail, for example, in DE-PS 27 07 383.
  • the oxygen probe 10 is arranged in an exhaust pipe 12 of an internal combustion engine 13, which receives the operating mixture from a mixture preparation arrangement 14, with which the ratio of fuel 15 to air 16 is determined.
  • the oxygen probe 10, which is connected to ground potential on one side, is connected to a voltage source U R via a resistor 17.
  • a supply line leads from the connection point of the resistors 11, 17 to the non-inverting input of a comparison device 18 and to the inverting input of a comparison device 19.
  • a threshold voltage voltage U 0 is applied to the inverting input of the comparison device 18, while a threshold value voltage U is applied to the non-inverting input of the comparison device 19 u is supplied.
  • the output variables of these two comparison devices 18, 19 control a probe state detection device 20, which in turn actuates a device symbolically referred to here as a switch 21, with which the control circuit is interrupted and switched to a control when the oxygen probe is not ready for operation.
  • the output variable of the comparison device 18 is also fed to a control device 22 which in turn controls the mixture preparation arrangement 14 via the switch 21.
  • a common dimensioning of the threshold value voltages U 0 , U u is to place them symmetrically with respect to the reference voltage U R , so that the two threshold values are separated by a voltage difference ⁇ U.
  • the control device 22 can, as indicated by the dashed arrows, be influenced by further machine parameters such as load L, temperature v or speed n.
  • the device described in FIG. 1 functions as follows: For voltages U A above the threshold value U 0 , the control device 22 regulates the gasoline mixture in the direction of lean values. However, the voltage U takes values between the upper threshold value and the lower threshold value, the control device 22 regulates the composition of the gasoline-air mixture in the direction of rich values. If the voltage U A is still in this window between the two threshold values after a monitoring time has elapsed, the probe state detection device 20 detects that the probe is not ready for operation and the switch 21 is actuated, so that a switch is made to a controller. If the control mode is switched for values U A below the lower threshold value U u , the control device 22 regulates the composition of the gasoline mixture in the rich direction.
  • the running direction of the control device 22 is thus only dependent on the position of the voltage U A in relation to the upper threshold value U 0 , which is why this threshold value is also referred to as the control threshold.
  • this threshold value is also referred to as the control threshold.
  • the control device is adjusted Expiry of a monitoring time switched over to control, in which case a rich operating mixture is usually aimed at.
  • the comparison device 18 switches (there is a rich operating mixture in the control), the probe status detection device 20 determines operational readiness, switches from control to regulation and the control device 22 regulates the operating mixture in the lean direction.
  • the composition of the operating mixture is again adjusted in the bold direction by the control device.
  • Appropriate dimensioning of the arrangement makes it possible for the voltage U A to exceed the upper threshold value U 0 again before the monitoring time has expired has stepped and the control remains switched on. In this way, the so-called “idle sawing", as described for example in the application P 31 49 136.7, is avoided.
  • FIG. 1 A voltage as a function of the temperature is also plotted in this diagram, which are now the two branches of the electromotive force U S of the oxygen probe 10.
  • the influence of the strongly temperature-dependent internal resistance 11 of the oxygen probe is initially neglected in this illustration.
  • the internal resistance 11 was taken into account for this in the effective switching thresholds designated U 0, eff and U U, eff , which are defined as the electromotive force U s of the oxygen probe 10, which is necessary for U A to reach the threshold values U 0 , U U . It can be seen from FIG.
  • FIG. 4 shows the electromotive force U S of the oxygen probe as a function of lambda.
  • the three different curves apply to temperatures T 3 , T 2 and T 1 . If one carries in this diagram 4 the course of the effective switching threshold U 0, eff , the lambda value varies over the temperature range T 3 to T 1 from ⁇ Max1 to ⁇ Min . Instead, the lower effective control threshold U U, eff increased by the value ⁇ .
  • U in the diagram in FIG. 4 there is no difference for high temperatures, as is also to be expected. For lower temperatures, however, a significantly higher variation of the lambda value from ⁇ Max2 to ⁇ Min occurs over the same temperature range T 3 to T 1 .
  • each type of mixture preparation arrangement 14 e.g. for controlled or regulated carburettors or for injection, be it continuous or clocked.

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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)
EP84104396A 1983-05-28 1984-04-18 Procédé et dispositif de commande du mélange air/combustible fourni à un moteur Withdrawn EP0126953A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3319432 1983-05-28
DE19833319432 DE3319432A1 (de) 1983-05-28 1983-05-28 Verfahren und einrichtung zur regelung des betriebsgemisches einer brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP0126953A2 true EP0126953A2 (fr) 1984-12-05
EP0126953A3 EP0126953A3 (fr) 1986-03-19

Family

ID=6200137

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84104396A Withdrawn EP0126953A3 (fr) 1983-05-28 1984-04-18 Procédé et dispositif de commande du mélange air/combustible fourni à un moteur

Country Status (4)

Country Link
US (1) US4528957A (fr)
EP (1) EP0126953A3 (fr)
JP (1) JPS59226253A (fr)
DE (1) DE3319432A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0640756B1 (fr) * 1993-08-31 1999-12-08 Yamaha Hatsudoki Kabushiki Kaisha Dispositif de correction du mélange pour moteurs à gaz
EP1467068A1 (fr) * 2003-04-12 2004-10-13 Audi Ag Procédé et dispositif de surveillance d'un variateur de levée de soupapes d'un moteur à combustion interne
CN109946083A (zh) * 2019-03-29 2019-06-28 吉林化工学院 一种航空发动机燃油调节器故障诊断设备

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6131640A (ja) * 1984-07-23 1986-02-14 Nippon Soken Inc 空燃比制御装置
JPH065217B2 (ja) * 1985-03-07 1994-01-19 日産自動車株式会社 空燃比制御装置
DE3531766C1 (de) * 1985-09-06 1989-07-20 Honsberg Gmbh Geb Spannvorrichtung fuer Werkstuecke
DE3727573A1 (de) * 1987-08-19 1989-03-02 Bosch Gmbh Robert Verfahren und einrichtung zur warmlauf-, vollast- und magerregelung einer brennkraftmaschine bei vorgegebenem lambda-wert
JP2600208B2 (ja) * 1987-10-20 1997-04-16 トヨタ自動車株式会社 内燃機関の空燃比制御装置
US4970858A (en) * 1988-03-30 1990-11-20 Toyota Jidosha Kabushiki Kaisha Air-fuel ratio feedback system having improved activation determination for air-fuel ratio sensor
DE3813219A1 (de) * 1988-04-20 1989-11-02 Bosch Gmbh Robert Verfahren und vorrichtung zur lambdaregelung
DE3839634A1 (de) * 1988-11-24 1990-05-31 Bosch Gmbh Robert Verfahren und vorrichtung zum festlegen mindestens einer schwellspannung bei lambda-eins-regelung
DE3840148A1 (de) * 1988-11-29 1990-05-31 Bosch Gmbh Robert Verfahren und vorrichtung zum erkennen eines fehlerzustandes einer lambdasonde
JP2704991B2 (ja) * 1989-09-12 1998-01-26 本田技研工業株式会社 ヒータ付排気濃度センサの活性化判別方法
US5337722A (en) * 1992-04-16 1994-08-16 Yamaha Hatsudoki Kabushiki Kaisha Fuel control and feed system for gas fueled engine
JP3139592B2 (ja) * 1993-08-31 2001-03-05 ヤマハ発動機株式会社 ガス燃料エンジンの混合気形成装置
US5575266A (en) * 1993-08-31 1996-11-19 Yamaha Hatsudoki Kabushiki Kaisha Method of operating gaseous fueled engine
JPH07253049A (ja) * 1994-03-14 1995-10-03 Yamaha Motor Co Ltd 気体燃料エンジン用燃料供給装置
JPH07253048A (ja) * 1994-03-15 1995-10-03 Yamaha Motor Co Ltd ガス燃料エンジンの混合気形成方法及び装置
DE19743644C2 (de) * 1997-10-02 1999-12-16 Bosch Gmbh Robert Verfahren zum Betrieb eines Gassensors
US6176224B1 (en) 1998-03-30 2001-01-23 Caterpillar Inc. Method of operating an internal combustion engine which uses a low energy gaseous fuel
US6250292B1 (en) * 2000-03-06 2001-06-26 Brunswick Corporation Method of controlling an engine with a pseudo throttle position sensor value
JP2012251795A (ja) * 2011-05-31 2012-12-20 Yamaha Motor Co Ltd 酸素センサの活性判定システム

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52114823A (en) * 1976-03-24 1977-09-27 Nissan Motor Co Ltd Air fuel ratio controller
DE2707383C2 (de) * 1977-02-21 1982-12-02 Robert Bosch Gmbh, 7000 Stuttgart Verfahren und Vorrichtung zur Überwachung der Betriebsbereitschaft einer Sauerstoffsonde (λ-Sonde)
JPS54162021A (en) * 1978-06-13 1979-12-22 Nissan Motor Co Ltd Air fuel ratio controller
DE2919220A1 (de) * 1979-05-12 1980-11-27 Bosch Gmbh Robert Verfahren zur regelung des kraftstoff/luftverhaeltnisses bei brennkraftmaschinen
DE3024607A1 (de) * 1980-06-28 1982-02-04 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zur regelung des kraftstoff/luftverhaeltnisses bei brennkraftmaschinen

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0640756B1 (fr) * 1993-08-31 1999-12-08 Yamaha Hatsudoki Kabushiki Kaisha Dispositif de correction du mélange pour moteurs à gaz
EP1467068A1 (fr) * 2003-04-12 2004-10-13 Audi Ag Procédé et dispositif de surveillance d'un variateur de levée de soupapes d'un moteur à combustion interne
CN109946083A (zh) * 2019-03-29 2019-06-28 吉林化工学院 一种航空发动机燃油调节器故障诊断设备
CN109946083B (zh) * 2019-03-29 2021-03-05 吉林化工学院 一种航空发动机燃油调节器故障诊断设备

Also Published As

Publication number Publication date
EP0126953A3 (fr) 1986-03-19
JPS59226253A (ja) 1984-12-19
DE3319432A1 (de) 1984-11-29
US4528957A (en) 1985-07-16

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Inventor name: JUNDT, WERNER, DIPL.-ING.