EP0427087A2 - Set de conversion pour moteurs Otto - Google Patents

Set de conversion pour moteurs Otto Download PDF

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Publication number
EP0427087A2
EP0427087A2 EP90120767A EP90120767A EP0427087A2 EP 0427087 A2 EP0427087 A2 EP 0427087A2 EP 90120767 A EP90120767 A EP 90120767A EP 90120767 A EP90120767 A EP 90120767A EP 0427087 A2 EP0427087 A2 EP 0427087A2
Authority
EP
European Patent Office
Prior art keywords
additional computer
retrofit kit
engine
kit according
temperature sensor
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.)
Granted
Application number
EP90120767A
Other languages
German (de)
English (en)
Other versions
EP0427087A3 (en
EP0427087B1 (fr
Inventor
Kurt Gutmann
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.)
Gutmann Messtechnik AG
Original Assignee
Gutmann Messtechnik AG
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Filing date
Publication date
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Application filed by Gutmann Messtechnik AG filed Critical Gutmann Messtechnik AG
Publication of EP0427087A2 publication Critical patent/EP0427087A2/fr
Publication of EP0427087A3 publication Critical patent/EP0427087A3/de
Application granted granted Critical
Publication of EP0427087B1 publication Critical patent/EP0427087B1/fr
Anticipated expiration legal-status Critical
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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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/28—Interface circuits
    • 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
    • F02D41/1446—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 exhaust temperatures
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/266—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor the computer being backed-up or assisted by another circuit, e.g. analogue
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/3005—Details not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2400/00—Control systems adapted for specific engine types; Special features of engine control systems not otherwise provided for; Power supply, connectors or cabling for engine control systems
    • F02D2400/11—After-sales modification devices designed to be used to modify an engine afterwards

Definitions

  • the invention relates to a retrofit kit for retrofitting gasoline injection systems for gasoline engines with a controlled catalyst having a lambda probe, the gasoline injection system having an injection control system with a computer which is equipped with measuring probes for the operating state of the engine, e.g. B. is a temperature sensor, an intake manifold pressure sensor, an intake air sensor and the like in control connection
  • Vehicles with an injection engine can be retrofitted with a regulated catalytic converter for exhaust gas purification.
  • a regulated catalytic converter for exhaust gas purification.
  • the existing injection control could also be modified accordingly.
  • this has the disadvantage that, if the control fails, a repair could only be carried out by a few workshops and that a "replacement repair" with replacement of the injection control is only possible if a suitable, also modified control is available.
  • a replacement repair with replacement of the injection control is only possible if a suitable, also modified control is available.
  • the object of the present invention is to provide a retrofit kit for injection gasoline engines which, in combination with the standard, unchanged injection control and a retrofitted commercial catalyst with lambda probe, results in an exhaust gas cleaning system with a regulated three-way catalyst, which results in a results in a significant reduction in emissions of sheep.
  • This retrofit kit should be designed so that the subsequent installation can be carried out easily in a short time and thus also inexpensively.
  • the invention proposes, in particular, that the retrofit kit has an additional computer which is connected to the lambda probe and also to at least one connecting line between a measuring probe and the injection controller in order to change at least one measuring signal coming from one of the measuring probes a change in the mixture preparation and readjustment to an optimal air-fuel ratio within the lambda window.
  • the additional computer With the help of the additional computer, the "incomprehensible" measurement signal of the lambda probe is converted into a quantity that can be evaluated by the existing control. Since the mixture preparation by the control, among other things, e.g. B.
  • a correction value can be superimposed on the measured value coming from the temperature sensor, the intake manifold pressure sensor, etc., so that the then changed measured value can trigger a corresponding reaction of the injection control.
  • the change in the measured value is carried out in such a way that the lambda value 1 required for optimal operation of the catalytic converter is set in accordance with an air / fuel ratio of 14.6: 1 with possibly small tolerance deviations. Accordingly, for example, if there is excess air, what a lambda value greater than 1 results, when using the engine temperature as a "manipulated" measurement signal, the actually measured operating temperature value of the engine is changed to lower values by the superimposed correction value, whereupon the injection control reacts with fuel enrichment of the mixture.
  • the readjustment of the injection control is thus carried out by simulation of "incorrect" measurement data per se. If the computer belonging to the injection control interprets comparatively fast, that is to say measurement data changes occurring at short time intervals, in particular with its input relating to the engine temperature, as an error, other measurement signals which change during operation and thus in a comparatively large area can also be superimposed of the measured value can be used with a correction value. Instead of the temperature measurement value, the intake pipe vacuum measurement value is preferably used in this case.
  • the retrofit kit according to the invention does not require any intervention in the existing system. The connection is made by simply reconnecting the existing connection line between the sensor used in each case and the injection control and by connecting to the on-board electrical system for the power supply.
  • the additional computer preferably has a variable resistor connected in series with a sensor resistor as an actuator for the simulation of the change in the measured variable.
  • the additional computer is connected via a control line to a valve which is located in a connecting line between the tank and the gasoline injection system and that the additional computer for controlling this valve has measurement inputs at least for the engine speed and the engine temperature .
  • this valve controlled by the additional computer depending on the particular operating state of the engine, gasoline vapors can be discharged from the tank into the fuel-air mixture, expediently when the hydrocarbon emission is low.
  • the only figure shows: is a schematic representation of a petrol engine equipped with a gasoline injection system and regulated three way catalyst.
  • An Otto engine 1 shown in the figure is equipped with a gasoline injection system 2, which is connected to an injection control 3.
  • This injection control 3 has a series of measurement inputs 4, the measurement data supplied here being processed by a computer belonging to the injection control 3.
  • data relating to the speed, the intake manifold vacuum, the outside temperature, the engine temperature, the throttle valve position, the position of the idling CO potentiometer, the intake air temperature and the like are supplied, for example.
  • a three-way catalytic converter is now to be retrofitted to reduce pollutant emissions.
  • a catalytic converter 6 and a lambda probe 7 are installed in the exhaust pipe 5.
  • the air-fuel ratio can be checked with the help of the lambda probe.
  • the exhaust gas composition is kept in a range required for the optimal action of the catalytic converter, the so-called lambda window.
  • the measurement data coming from the lambda probe 7 cannot be processed by the existing injection control.
  • the retrofit kit according to the invention has an additional computer 8 in addition to the catalytic converter 6 and the lambda probe 7.
  • a connecting line 9 to the lambda probe 7 and also to one or more connecting lines between one of the aforementioned Measured variables relevant measuring probe and the injection control 3 connected.
  • the additional computer is connected to the connecting line 10 between a temperature sensor 11 on the engine 1 and the injection control 3.
  • the fuel injection quantity is heavily dependent on the engine temperature. At a lower engine temperature, the fuel-air mixture is enriched, while when the operating temperature rises, the proportion of air increases and the mixture is thus leaned. An air / fuel ratio of 14.6: 1 is also sought, especially when using a catalytic converter. This corresponds to a lambda value equal to 1. With the help of the lambda probe, it can now be checked whether this optimal mixture composition is present.
  • the standard injection control 3 is now z. B. supplied via the temperature measurement line 10 from the additional computer 8, a superimposed correction signal.
  • the fuel injection system can also vary depending on this signal, it is now possible to convert the measurement signal coming from the lambda probe 7 through the additional computer 8 and to simulate a temperature measurement value which causes the injection control 3 to correct the injection quantity in the Undertake a regulation to a lambda value 1.
  • the temperature sensor 11 on the motor 1 usually consists of a temperature-dependent resistor with a negative temperature coefficient. This means that the resistance of the temperature sensor decreases with increasing temperature. It is now preferably provided that a variable resistor, for example a transistor, connected in series with the temperature sensor is provided within the additional computer 8. The resistance of the temperature measuring circuit can thus be increased.
  • the injection controller 3 interprets this as a temperature drop and would then enrich the fuel-air mixture, ie increase the amount of gasoline injection.
  • the regulation in the enrichment area is sufficient since the gasoline injection systems or their injection control are generally set to be lean, which would correspond to a lambda value greater than 1.
  • a lambda value of 1 is aimed for an optimal working of the catalytic converter, a (small) shift to a richer mixture is necessary in any case.
  • a variable resistor is connected in parallel with the temperature sensor resistor within the additional computer 8 and that a further variable resistor connected in series with this parallel connection is provided.
  • the resistance value of the temperature sensor can be changed to both smaller and larger values.
  • a series connection of the temperature sensor resistor and a variable resistor is sufficient as an actuator for the simulation of the measured value change.
  • the additional computer preferably also contains an emergency program for generating control signals corresponding to approximately lambda equal to 1 in the event of failure and / or malfunction of the input measurement signals.
  • an emergency program for generating control signals corresponding to approximately lambda equal to 1 in the event of failure and / or malfunction of the input measurement signals.
  • a system connection of the measuring probe resistance and the variable actuator resistance also results in a further safety factor, since an uncontrolled leaning of the engine cannot occur here. If the variable resistor connected in series were short-circuited, the situation would be the same as for the original, standard setting. If the resistance changed to higher values or there was an interruption, only one would go over greasing the mixture, but this would not cause any damage to the engine. In this case, the original state can be restored in the simplest way by simply plugging the connecting line 10.
  • the plug connection 12 present at the end of the connecting line 10 is no longer connected directly to the temperature sensor 11, but to the additional computer 8, which in turn has a plug connection 12 a which is connected to the temperature sensor 11 instead of the plug connection 12. This also makes it clear that no intervention in the existing system is required.
  • the tank and the gasoline injection system can be connected to one another via a line, within which a valve 14 is located.
  • gasoline vapors can be added to the air-fuel mixture via this valve.
  • a carbon active filter can also be used within the connecting line between the tank and the gasoline injection system to bind pollutants.
  • the valve 14 is controlled by the additional computer 8.
  • the additional computer 8 is connected to measurement inputs 15 for the engine speed and a measurement input 16 for the operating temperature of the engine.
  • the measuring inputs 15 are connected to the ignition coil 17, while the measuring input 16 is connected to a further temperature sensor 18, which is also connected to a temperature display 19.
  • the operating state in which gasoline vapors can be fed to the engine is recognized from these measurement data. This is the case when the hydrocarbon content in the exhaust gases is low.
  • the throttle valve switch which is then present can be connected to the additional computer 8 in order to avoid malfunctions in the push mode.
  • a connection for self-diagnosis of the additional computer 8 is designated.
  • the retrofit kit can have a cable harness which is in each case assembled for the specific vehicle type and has corresponding plug connections. This means that this retrofit kit can be installed in no time without special knowledge. Complicated interventions in the existing system can be avoided.
  • a significant advantage of the system according to the invention is that if the additional computer 8 fails, the motor does not stop and can therefore be continued.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
EP90120767A 1989-11-04 1990-10-30 Set de conversion pour moteurs Otto Expired - Lifetime EP0427087B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3936820 1989-11-04
DE3936820 1989-11-04
DE4001334A DE4001334A1 (de) 1989-11-04 1990-01-18 Nachruestsatz fuer otto-motoren
DE4001334 1990-01-18

Publications (3)

Publication Number Publication Date
EP0427087A2 true EP0427087A2 (fr) 1991-05-15
EP0427087A3 EP0427087A3 (en) 1991-11-06
EP0427087B1 EP0427087B1 (fr) 1993-04-07

Family

ID=25886776

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90120767A Expired - Lifetime EP0427087B1 (fr) 1989-11-04 1990-10-30 Set de conversion pour moteurs Otto

Country Status (2)

Country Link
EP (1) EP0427087B1 (fr)
DE (2) DE4001334A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999028603A2 (fr) * 1997-11-30 1999-06-10 Wissenschaftliche Werkstatt Für Umweltmesstechnik Gmbh Mesure de constituants de substances nocives contenues dans des gaz d'echappement et reduction d'emissions de substances nocives au cours du demarrage a froid et du trajet
WO2007115624A1 (fr) * 2006-03-31 2007-10-18 Avg Gmbh Module de rattrapage pour vehicules automobiles avec catalyseur regule

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4120891A1 (de) * 1991-06-25 1993-01-07 Bayerische Motoren Werke Ag Brennkraftmaschine mit einer sekundaerluftpumpe, sowie betriebsverfahren hierfuer
DE19633681C2 (de) * 1996-08-21 2001-11-29 Udo Schol Lambda-geregelter Zusatzgemischbildner zur G-Kat Nachrüstung von Brennkraftmaschinen

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2431559A1 (de) * 1973-08-11 1975-07-03 Nippon Denso Co Elektronisch gesteuertes brennstoffeinspritzsystem
FR2263384A1 (en) * 1974-03-06 1975-10-03 Sopromi Soc Proc Modern Inject Correction cct. for engine fuel injection system - varies duration of injection time according to exhaust oxygen content
JPS5447014A (en) * 1977-09-21 1979-04-13 Hitachi Ltd Electronic engine controller
JPS5510055A (en) * 1978-07-10 1980-01-24 Toyota Motor Corp Hc release controlling apparatus for catalyst loading car at cold
JPS5510081A (en) * 1978-07-10 1980-01-24 Toyota Motor Corp Collecting and purging device of fuel vapor in engine
JPS58133446A (ja) * 1982-02-02 1983-08-09 Meidensha Electric Mfg Co Ltd エンジン吸入空気圧力制御装置
JPS62159748A (ja) * 1986-01-08 1987-07-15 Fuji Heavy Ind Ltd 排気ガス温度上昇防止システム

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2202614A1 (de) * 1972-01-20 1973-08-02 Bosch Gmbh Robert Abgasnachverbrennungseinrichtung
DE3511997A1 (de) * 1985-04-02 1986-10-09 Volkswagen AG, 3180 Wolfsburg Anordnung fuer fahrzeuge, insbesondere personenkraftfahrzeuge
JPH0799110B2 (ja) * 1987-08-17 1995-10-25 本田技研工業株式会社 内燃エンジンの空燃比フィ−ドバック制御方法
DE3800088A1 (de) * 1988-01-05 1989-07-13 Vdo Schindling Verfahren zur verbesserung des abgasverhaltens von ottomotoren
DE3807999A1 (de) * 1988-03-10 1989-09-21 Voest Alpine Automotive Elektronischer regler fuer kraftfahrzeuge mit brennkraftmaschinen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2431559A1 (de) * 1973-08-11 1975-07-03 Nippon Denso Co Elektronisch gesteuertes brennstoffeinspritzsystem
FR2263384A1 (en) * 1974-03-06 1975-10-03 Sopromi Soc Proc Modern Inject Correction cct. for engine fuel injection system - varies duration of injection time according to exhaust oxygen content
JPS5447014A (en) * 1977-09-21 1979-04-13 Hitachi Ltd Electronic engine controller
JPS5510055A (en) * 1978-07-10 1980-01-24 Toyota Motor Corp Hc release controlling apparatus for catalyst loading car at cold
JPS5510081A (en) * 1978-07-10 1980-01-24 Toyota Motor Corp Collecting and purging device of fuel vapor in engine
JPS58133446A (ja) * 1982-02-02 1983-08-09 Meidensha Electric Mfg Co Ltd エンジン吸入空気圧力制御装置
JPS62159748A (ja) * 1986-01-08 1987-07-15 Fuji Heavy Ind Ltd 排気ガス温度上昇防止システム

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 11, Nr. 392 (M-653), 22. Dezember 1987; & JP-A-62 159 748 (FUJI) 15-07-1987 *
PATENT ABSTRACTS OF JAPAN, Band 3, Nr. 69 (M-062), 14. Juni 1979; & JP-A-54 047 014 (HITACHI) 13-04-1979 *
PATENT ABSTRACTS OF JAPAN, Band 4, Nr. 37 (M-004), 27. März 1980; & JP-A-55 010 055 (TOYOTA) 24-01-1980 *
PATENT ABSTRACTS OF JAPAN, Band 4, Nr. 37 (M-004), 27. März 1980; & JP-A-55 010 081 (TOYOTA) 24-01-1980 *
PATENT ABSTRACTS OF JAPAN, Band 7, Nr. 246 (M-253), 2. November 1983; & JP-A-58 133 446 (MEIDENSHA) 09-08-1983 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999028603A2 (fr) * 1997-11-30 1999-06-10 Wissenschaftliche Werkstatt Für Umweltmesstechnik Gmbh Mesure de constituants de substances nocives contenues dans des gaz d'echappement et reduction d'emissions de substances nocives au cours du demarrage a froid et du trajet
WO1999028603A3 (fr) * 1997-11-30 1999-08-19 Wissenschaftliche Werkstatt Fu Mesure de constituants de substances nocives contenues dans des gaz d'echappement et reduction d'emissions de substances nocives au cours du demarrage a froid et du trajet
US6532793B1 (en) 1997-11-30 2003-03-18 Wissenschaftliche Werkstatt Fur Umweltmesstechnik Gmbh Measurement of contaminant components in exhaust gas and reduction of excessive contaminant emissions during cold starts and while driving
WO2007115624A1 (fr) * 2006-03-31 2007-10-18 Avg Gmbh Module de rattrapage pour vehicules automobiles avec catalyseur regule

Also Published As

Publication number Publication date
EP0427087A3 (en) 1991-11-06
EP0427087B1 (fr) 1993-04-07
DE4001334A1 (de) 1991-05-08
DE59001169D1 (de) 1993-05-13

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