EP0081759B1 - Einrichtung zur Regelung des Kraftstoff-Luftverhältnisses bei Brennkraftmaschinen - Google Patents

Einrichtung zur Regelung des Kraftstoff-Luftverhältnisses bei Brennkraftmaschinen Download PDF

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Publication number
EP0081759B1
EP0081759B1 EP82111154A EP82111154A EP0081759B1 EP 0081759 B1 EP0081759 B1 EP 0081759B1 EP 82111154 A EP82111154 A EP 82111154A EP 82111154 A EP82111154 A EP 82111154A EP 0081759 B1 EP0081759 B1 EP 0081759B1
Authority
EP
European Patent Office
Prior art keywords
probe
voltage
lambda probe
lambda
threshold
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
EP82111154A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0081759A2 (de
EP0081759A3 (en
Inventor
Werner Dipl.-Ing. Jundt
Rolf Dipl.-Ing. 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
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
Publication of EP0081759A2 publication Critical patent/EP0081759A2/de
Publication of EP0081759A3 publication Critical patent/EP0081759A3/de
Application granted granted Critical
Publication of EP0081759B1 publication Critical patent/EP0081759B1/de
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
    • F02D41/14—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)
    • F02D41/1479—Using a comparator with variable reference
    • 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 is based on a device according to the type of the independent main claim.
  • a device DE-A 27 07 383
  • the control device is controlled with the output value of this comparison device.
  • the output values of both comparison devices provide information about the operational readiness of the lambda probe.
  • the temperature at which operational readiness is recognized is the same for a lean and rich mixture.
  • this arrangement has the disadvantage that the control device is switched on and off several times, so that the control device cannot be used soon.
  • the engine is operated while idling, the period in which the control device is switched on and off can be repeated several times and thus lead to unfavorable engine running behavior, the so-called idling saws.
  • the device according to the invention for controlling the air-fuel ratio with the characterizing features of the independent claim has the advantage that the control device is only switched on when the engine has reached an operating temperature that prevents the control device from being switched off again.
  • the dependent patent claim enables advantageous further development and improvement of the device specified in the main claim.
  • the resultant asymmetrical switch-on resistance characteristic curve means that the control device shows the best possible control behavior immediately after switching on, in particular even when there are certain variations in the characteristic values of the lambda sensor.
  • FIG. 1 shows an exemplary embodiment according to the invention
  • FIG. 2 shows a diagram to explain the functioning of control devices according to the prior art
  • FIG. 3 shows a diagram to explain the functioning of the control device according to the invention.
  • the solution according to the invention is a further development of the device described in DE-A-27 07 383.
  • the essential component of the device according to the invention is a lambda probe of a known type, which is inserted into the exhaust system of an internal combustion engine and around which the exhaust gases resulting from the combustion processes in the cylinders of the internal combustion engine flow.
  • the probe consists of a solid electrolyte, for example zirconium dioxide, which is contacted on both sides. One side of the zirconia body is exposed to the exhaust gas and the other side to a reference medium.
  • a potential difference arises at the contacts.
  • the lambda probe has the disadvantage that the internal resistance of the probe is extremely high in the cold state, so that no voltage signal usable for regulation, in particular no significant voltage jump, can be achieved at the output of the lambda probe.
  • 1 shows the lambda probe 1 as an equivalent circuit diagram, consisting of a voltage source 2 and the temperature-dependent internal resistance 3.
  • the lambda probe is used in the exhaust system, not shown, of an internal combustion engine.
  • the internal combustion engine is supplied with an operating mixture of fuel and air by means of a fuel-air metering device, which mixture is combusted in the combustion chambers of the internal combustion engine.
  • the ratio of fuel to air can be set in a controlled manner in the fuel-air metering device and corrected with a control device.
  • the aim is to have the overlying control device for fuel and air metering take effect as early as possible after the internal combustion engine has been started up.
  • a circuit has been proposed in DE-A-27 383 with which an output voltage of the probe that changes with the size of the internal resistance is sensed with the aid of threshold switches, after exceeding of the defined threshold values, a signal is generated that starts the control.
  • 1 shows a section of this circuit arrangement.
  • 1 is the lambda probe, which has a voltage source 2 and a temperature-dependent resistor 3.
  • a DC voltage source with a series resistor 4 is connected in parallel with the lambda probe 1.
  • a voltage U A is tapped at the lambda probe 1, which leads to an input of threshold value amplifiers 9 and 10.
  • the voltage U A is passed via a further line to a control device, not shown.
  • Three resistors 6, 7 and 8 are connected between the positive supply voltage and ground. Between the resistors 6 and 7, a signal is fed to the threshold amplifier 9 and thus the upper switch-on threshold is set. Another signal is tapped between the resistors 7 and 8 and fed to the threshold amplifier 10. This sets the lower threshold.
  • the output signals of the threshold switches can be further processed, for example, as proposed in DE-A-27 07 383.
  • the probe voltage U s which is necessary for U A to reach the upper switching threshold, which is set on the threshold amplifier 9, for a predetermined value of the temperature-dependent resistor 3, is called the effective switching threshold U max - U max and U min are shown in FIG 2 shown.
  • the curves of the maximum and minimum probe voltages that occur in the application are shown in solid lines.
  • the controller is set to a fixed control value.
  • the exhaust gas mixture is usually rich (lambda less than 1).
  • the threshold Umax is therefore exceeded and the PI controller is switched to control.
  • the PI controller regulates towards a lean mixture.
  • the PI controller is switched off again and a fixed control value is specified.
  • the circuit arrangement according to the invention takes advantage of the effect that the direction of travel of the PI controller is only dependent on the position of the output voltage U A to the lower threshold. If U max is exceeded or if the probe voltage is between U max and U min , the PI controller regulates the gasoline mixture to lean. A monitoring time also runs in the range from U max to U min . After this monitoring time has expired, the PI controller is set to a control value.
  • the gasoline mixture is regulated to rich only when the output voltage U & falls below the lower threshold. Without changing the control properties, it is therefore possible to shift the upper threshold voltage U max so that the controller is only switched on at higher temperatures.
  • U max is only reached at temperature T 2 .
  • the controller is switched on and regulates the fuel mixture in the lean direction.
  • the probe has warmed up enough to fall below the threshold U min at lambda - 1.2.
  • the PI controller regulates the mixture to rich again, ie there is no need to switch to the control value. The regulation is thus immediately ready for operation, without having to switch back and forth between the regulation and regulation. With this measure, an early start of control can be achieved without idling saws occurring in the engine.
  • the - temperature-dependent - probe internal resistance for first reaching the threshold voltages of downstream comparators in the range 1 MQ to 2 MQ was determined, and it was determined by selecting the terminal voltage of the counter voltage source 5 (corresponding approximately to the mean voltage of the comparator window, that is, midway between the upper and lower threshold values or corresponding to an average voltage value of the probe output signal) based on an average lambda probe voltage and the same but opposite deviations from this, a symmetrical influence behavior on the upper and lower switching threshold to be reached, downstream threshold switch provided.
  • the re-dimensioning of a matching network 4, 5, 6 and 8 proposed according to the invention is now selected so that for the first time a response from threshold switches 9 and 10 connected downstream of the lambda probe does not occur when the temperatures of the lambda probe differ significantly - i.e. not with significantly different internal resistances of the same - but at approximately the same temperature, i.e. with approximately the same internal resistance on the order of only 30 to 200 KSZ.
  • the dimensioning defines an EMF switching threshold of 0.8 V for the switching of a first, rich threshold value switch at an upper, rich, switching threshold of the lambda probe and an EMF switching value for switching a second, lean threshold value switch at a lower, lean switching threshold.
  • Switching threshold of the lambda probe of 0.1 V is based, and can be adjusted in a simple manner to the lambda probe used and typical scatter of its parameters - for example due to aging - in such a way that the upper switching threshold with a particularly rich mixture at a slightly lower temperature when the lower switching threshold is reached for the first time with a lean mixture that can be specified and the lowest scattering lean voltage of the lambda probe, slightly earlier. This ensures that when the lower, lean switching threshold of the second threshold switch is undershot for the first time, stable, regulated operation can be started instead of controlled operation with a predetermined setpoint.
  • the invention thus covers all dimensions of the matching network 4, 5, 6, 7 and 8 which can be clearly defined for very specific lambda probes, with the consequence of the property described.

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)
  • Combined Controls Of Internal Combustion Engines (AREA)
EP82111154A 1981-12-11 1982-12-02 Einrichtung zur Regelung des Kraftstoff-Luftverhältnisses bei Brennkraftmaschinen Expired EP0081759B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813149136 DE3149136A1 (de) 1981-12-11 1981-12-11 Einrichtung zur regelung des kraftstoff-luftverhaeltnisses bei brennkraftmaschinen
DE3149136 1981-12-11

Publications (3)

Publication Number Publication Date
EP0081759A2 EP0081759A2 (de) 1983-06-22
EP0081759A3 EP0081759A3 (en) 1984-11-28
EP0081759B1 true EP0081759B1 (de) 1988-03-16

Family

ID=6148504

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82111154A Expired EP0081759B1 (de) 1981-12-11 1982-12-02 Einrichtung zur Regelung des Kraftstoff-Luftverhältnisses bei Brennkraftmaschinen

Country Status (4)

Country Link
US (1) US4492205A (ja)
EP (1) EP0081759B1 (ja)
JP (1) JPS58106152A (ja)
DE (2) DE3149136A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3149136A1 (de) * 1981-12-11 1983-06-23 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zur regelung des kraftstoff-luftverhaeltnisses bei brennkraftmaschinen

Families Citing this family (24)

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Publication number Priority date Publication date Assignee Title
JPS6090937A (ja) * 1983-10-22 1985-05-22 Nippon Denso Co Ltd 空燃比制御装置
JPS60235050A (ja) * 1984-05-07 1985-11-21 Toyota Motor Corp 酸素センサの電気ヒ−タの通電制御方法
DE3433305A1 (de) * 1984-09-11 1986-03-20 Westfälische Metall Industrie KG Hueck & Co, 4780 Lippstadt Verfahren und vorrichtung zur regelung der zusammensetzung des kraftstoff-luft-gemisches einer brennkraftmaschine
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
DE3839634A1 (de) * 1988-11-24 1990-05-31 Bosch Gmbh Robert Verfahren und vorrichtung zum festlegen mindestens einer schwellspannung bei lambda-eins-regelung
DE3904986A1 (de) * 1989-02-18 1990-08-23 Bosch Gmbh Robert Verfahren zum erkennen der betriebsbereitschaft einer lambdasonde
US5337722A (en) * 1992-04-16 1994-08-16 Yamaha Hatsudoki Kabushiki Kaisha Fuel control and feed system for gas fueled engine
US5546919A (en) * 1993-08-31 1996-08-20 Yamaha Hatsudoki Kabushiki Kaisha Operating arrangement for gaseous 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
US5392643A (en) * 1993-11-22 1995-02-28 Chrysler Corporation Oxygen heater sensor diagnostic routine
DE4402618C2 (de) * 1994-01-28 1998-04-30 Uwe Bastian Verfahren und Meßanordnung zur Überprüfung des Lambda-Regelkreises bei geregelten Abgaskatalysatoren
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
DE19729696C2 (de) * 1997-07-11 2002-02-21 Bosch Gmbh Robert Verfahren und Vorrichtung zur Funktionsüberwachung einer Gas-Sonde
US6176224B1 (en) 1998-03-30 2001-01-23 Caterpillar Inc. Method of operating an internal combustion engine which uses a low energy gaseous fuel
US7854924B2 (en) * 2004-03-30 2010-12-21 Relypsa, Inc. Methods and compositions for treatment of ion imbalances
KR101228233B1 (ko) * 2004-03-30 2013-01-31 리립사, 인크. 이온 결합 중합체 및 이의 용도
DE102004050092B3 (de) * 2004-10-14 2006-04-13 Siemens Ag Verfahren zur Regelung des Lambda-Wertes einer Brennkraftmaschine
KR20080057319A (ko) * 2005-09-30 2008-06-24 일립사, 인코포레이티드 가교 쉘을 갖는 코어-쉘 복합체의 제조 방법, 및 이로부터수득되는 코어-쉘 복합체
WO2007041569A1 (en) * 2005-09-30 2007-04-12 Ilypsa, Inc. Methods and compositions for selectively removing potassium ion from the gastrointestinal tract of a mammal
WO2010022380A2 (en) 2008-08-22 2010-02-25 Relypsa, Inc. Linear polyol stabilized polyfluoroacrylate compositions
US20100104527A1 (en) * 2008-08-22 2010-04-29 Relypsa, Inc. Treating hyperkalemia with crosslinked cation exchange polymers of improved physical properties
US10813946B2 (en) 2012-10-08 2020-10-27 Vifor (International) Ltd. Potassium binding polymers for treating hypertension and hyperkalemia

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SE411784B (sv) * 1975-04-18 1980-02-04 Bosch Gmbh Robert Sett och anordning for bestemning av varaktighet av brensletillforselpulser
DE2649272C2 (de) * 1976-05-22 1986-04-03 Robert Bosch Gmbh, 7000 Stuttgart Regelverfahren und Gemischverhältnisregeleinrichtung zur Bestimmung der Verhältnisanteile eines einer Brennkraftmaschine zugeführten Kraftstoff-Luftgemisches
JPS5382927A (en) * 1976-12-28 1978-07-21 Nissan Motor Co Ltd Air-fuel ratio controlling apparatus
DE2700629A1 (de) * 1977-01-08 1978-07-20 Bosch Gmbh Robert Vorrichtung zur erkennung der regelbereitschaft einer lambda-sonde
DE2707383C2 (de) * 1977-02-21 1982-12-02 Robert Bosch Gmbh, 7000 Stuttgart Verfahren und Vorrichtung zur Überwachung der Betriebsbereitschaft einer Sauerstoffsonde (λ-Sonde)
US4263652A (en) * 1978-02-27 1981-04-21 The Bendix Corporation Oxygen sensor signal conditioner
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JPS5654346A (en) * 1979-10-09 1981-05-14 Nissan Motor Co Ltd Controller for air fuel ratio
DE3024607A1 (de) * 1980-06-28 1982-02-04 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zur regelung des kraftstoff/luftverhaeltnisses bei brennkraftmaschinen
DE3149136A1 (de) * 1981-12-11 1983-06-23 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zur regelung des kraftstoff-luftverhaeltnisses bei brennkraftmaschinen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3149136A1 (de) * 1981-12-11 1983-06-23 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zur regelung des kraftstoff-luftverhaeltnisses bei brennkraftmaschinen

Also Published As

Publication number Publication date
JPH0380976B2 (ja) 1991-12-26
EP0081759A2 (de) 1983-06-22
DE3278245D1 (en) 1988-04-21
EP0081759A3 (en) 1984-11-28
DE3149136C2 (ja) 1990-05-31
JPS58106152A (ja) 1983-06-24
DE3149136A1 (de) 1983-06-23
US4492205A (en) 1985-01-08

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