EP0427087B1 - Set de conversion pour moteurs Otto - Google Patents

Set de conversion pour moteurs Otto Download PDF

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Publication number
EP0427087B1
EP0427087B1 EP90120767A EP90120767A EP0427087B1 EP 0427087 B1 EP0427087 B1 EP 0427087B1 EP 90120767 A EP90120767 A EP 90120767A EP 90120767 A EP90120767 A EP 90120767A EP 0427087 B1 EP0427087 B1 EP 0427087B1
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EP
European Patent Office
Prior art keywords
computer
conversion kit
control
engine
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.)
Expired - Lifetime
Application number
EP90120767A
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German (de)
English (en)
Other versions
EP0427087A3 (en
EP0427087A2 (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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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
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Publication of EP0427087B1 publication Critical patent/EP0427087B1/fr
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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 with a computer, which with measuring probes for the operating state of the engine, for.
  • B. a temperature sensor, an intake manifold pressure sensor, an intake air sensor and the like is in control connection, according to claim 1.1. Part (see. FR-A-2263 384).
  • 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 in the event of failure the control could only be repaired 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.
  • the object of the present invention is to provide a retrofit kit for injection gasoline engines which, in conjunction 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 "incomprehensible" measurement signal of the lambda probe for the injection control 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. depending on the operating temperature of the engine, 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.
  • 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 vehicle electrical system for power supply. Due to the variable resistance of the additional computer, the resistance value of the respective measuring circuit or the respective probe resistance can be increased and the air-fuel mixture can thus be enriched.
  • 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 gasoline engine equipped with a gasoline injection system and controlled 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 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 preferably now 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.
  • An increase in the measuring circuit resistance interprets the injection control 3, however, as a lowering of the temperature and would then enrich the fuel-air mixture, ie increase the fuel injection quantity.
  • 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. 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 overfatting would occur of the mixture take place, but this would cause no 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)

Claims (9)

  1. Lot de conversion pour équiper après coup des équipement d'injection d'essence pour moteurs à explosion d'un pot catalytique réglé, présentant une sonde lambda, l'équipment d'injection d'essence comportant une commande d'injection avec un ordinateur qui est en liaison de commande avec des sondes de mesure pour le régime du moteur, par exemple un capteur de température, un capteur manométrique sur la tubulure d'admission, un capteur pour l'air aspiré et analogues, le lot de conversion comportant un ordinateur auxiliaire (8) raccordé à la sonde lambda (7) et en outre à au moins une ligne de liaison (10) entre une sonde de mesure et la commande d'injection (3), en vue de la modification d'au moins un signal de mesure venant d'une sonde de mesure, dans le sens d'un changement de la préparation du mélange et d'une post-régulation sur un rapport air/carburant optimal à l'intérieur de la fenêtre lambda, la résistance d'au moins une des sondes de mesure pour la commande d'injection étant appliquée en tant que paramètre de fonctionnement à une entrée de l'ordinateur, caractérisé en ce qu'une résistance variable est montée en série avec une résistance, indiquant un paramètre de fonctionnement, d'une des sondes de mesure, et que des moyens sont prévus dans l'ordinateur auxiliaire pour modifier les résistances variables de manière que la commande d'injection soit amenée à corriger la quantité de carburant injectée dans le sens d'une régulation de la valeur lambda sur une valeur de consigne.
  2. Lot de conversion selon la revendication 1, caractérisé en ce que, en plus de la résistance variable montée en série avec la résistance de capteur ou de sonde indiquant un paramètre de fonctionnement d'une des sondes de mesure, l'ordinateur auxiliaire (8) comporte une résistance variable supplémentaire montée en parallèle avec la résistance de capteur, et que ces deux résistances variables sont prévues comme des organes de réglage pour augmenter ou diminuer la résistance de capteur utilisée.
  3. Lot de conversion selon la revendication 1 ou 2, caractérisé en ce que, pour changer la formation du mélange, l'ordinateur auxiliaire est relié à un capteur de température du moteur (11), de préférence au capteur de température relié à un instrument d'affichage.
  4. Lot de conversion selon une des revendications 1 à 3, caractérisé en ce que, pour changer la formation du mélange, l'ordinateur auxiliaire (8) est raccordé au capteur manométrique de la tubulure d'admission et/ou à un potentiomètre couplé au papillon de gaz et/ou au capteur de température de l'air aspiré et/ou au potentiomètre de CO pour la marche au ralenti.
  5. Lot de conversion selon une des revendications 1 à 4, caractérisé en ce que l'ordinateur auxiliaire (8) est relié par une ligne de commande à une soupape (14) montée dans une canalisation de liaison entre le réservoir et le système d'injection d'essence et que l'ordinateur auxiliaire présente des entrées de mesure (15, 16), tout au moins pour la vitesse de rotation du moteur ainsi que la température du moteur, pour commander cette soupape.
  6. Lot de conversion selon la revendication 5, caractérisé en ce que la canalisation de liaison, présentant la soupape (14), comporte un filtre à charbon actif pour l'amenée de vapeurs d'essence depuis le réservoir au moteur.
  7. Lot de conversion selon une des revendications 1 à 6, caractérisé en ce que l'ordinateur auxiliaire (8) présente une entrée de mesure pour surveiller le couplage de poussée et est de préférence raccordé, à cet effet, à un commutateur de papillon.
  8. Lot de conversion selon une des revendications 1 à 7, caractérisé en ce qu'il comprend, en plus de l'ordinateur auxiliaire (8), un harnais de câbles confectionné pour des types de véhicules déterminés et pourvu de préférence de connexions à enfichage, au moins pour le capteur de température du moteur (11), et d'un connecteur à enfichage (12) pour le capteur de température de la commande d'injection (3), ainsi que la sonde lambda (7), et que d'autres raccordements, de préférence à enfichage, sont éventuellement prévus pour la bobine d'allumage (17) ou analogue et pour un capteur de température, en particulier un capteur de température supplémentaire (18).
  9. Lot de conversion selon une des revendications 1 à 8, caractérisé en ce que l'ordinateur auxiliaire (8) contient, à côté de son programme de réglage, un programme de secours pour la génération de signaux de commande correspondant à l'obtention d'une valeur lambda environ égale à 1 en cas de défaillance et/ou de perturbation des signaux de mesure d'entrée.
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 EP0427087A2 (fr) 1991-05-15
EP0427087A3 EP0427087A3 (en) 1991-11-06
EP0427087B1 true EP0427087B1 (fr) 1993-04-07

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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

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

Families Citing this family (4)

* 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
PT1002186E (pt) * 1997-11-30 2001-10-31 Wissenschaf Werkstatt Fur Umwe Metedo para reconhecer defeitos num motor de combustao interna e no sistema de pos-tratamento dos gases de escape mediante a medicao dos componentes contaminantes nos gases de escape durante o arranque a frio e durante a conducao
DE102006015509B3 (de) * 2006-03-31 2007-08-23 Avg Gmbh Nachrüstmodel für Fahrzeuge mit geregeltem Katalysator

Family Cites Families (12)

* 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
JPS5226285B2 (fr) * 1973-08-11 1977-07-13
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
JPS602510B2 (ja) * 1977-09-21 1985-01-22 株式会社日立製作所 自動車制御用アクチユエータの制御装置
JPS5510081A (en) * 1978-07-10 1980-01-24 Toyota Motor Corp Collecting and purging device of fuel vapor in engine
JPS5510055A (en) * 1978-07-10 1980-01-24 Toyota Motor Corp Hc release controlling apparatus for catalyst loading car at cold
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
DE3511997A1 (de) * 1985-04-02 1986-10-09 Volkswagen AG, 3180 Wolfsburg Anordnung fuer fahrzeuge, insbesondere personenkraftfahrzeuge
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
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

Also Published As

Publication number Publication date
DE4001334A1 (de) 1991-05-08
EP0427087A3 (en) 1991-11-06
EP0427087A2 (fr) 1991-05-15
DE59001169D1 (de) 1993-05-13

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