EP0427087A2 - Conversion kit for Otto engines - Google Patents

Conversion kit for Otto engines 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
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EP
European Patent Office
Prior art keywords
additional computer
retrofit kit
engine
kit according
temperature sensor
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Granted
Application number
EP90120767A
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German (de)
French (fr)
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EP0427087A3 (en
EP0427087B1 (en
Inventor
Kurt Gutmann
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Gutmann Messtechnik AG
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Gutmann Messtechnik AG
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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
    • F02D41/24—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)

Abstract

A conversion kit according to the invention serves for the conversion of injection spark ignition engines with a controlled catalytic converter having a lambda probe (7). An injection control unit (3) serves for controlling the air-fuel mixture as a function of the engine operating state. This is connected to measuring probes for the operating state of the engine, e.g. a temperature sensor (11) located on the engine (1). According to the invention the conversion kit comprises an additional computer (8) which is connected on the one hand to the lambda probe (7) and in addition to a connecting line between a measuring probe, for example the temperature sensor (11), and the injection control unit (3). The measuring signal is now varied on the basis of the measured data coming from the lambda probe (7) so that the injection control unit undertakes a correction of the air-fuel ratio in such a way that a lambda value of approximately 1 is set corresponding to an air-fuel ratio of 14.6:1. <IMAGE>

Description

Die Erfindung betrifft einen Nachrüstsatz zum Nachrüsten von Benzineinspritzanlagen für Otto-Motoren mit einem eine Lambda-Sonde aufweisenden, geregelten Katalysator, wobei die Benzineinspritzanlage eine Einspritz-Steuerung mit einem Rechner aufweist, der mit Meßsonden für den Betriebszustand des Motors, z. B. einem Temperaturfühler, einem Saugrohr­druckfühler, einem Ansaugluftfühler und dergleichen in Steuerverbindung stehtThe 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

Fahrzeuge mit Einspritzmotor können zur Abgasreinigung mit einem geregelten Katalysator nachträglich ausgerüstet werden. Dazu ist bekannt, die vorhandene Einspritz-Steuerung durch eine neue, mit einem Anschluß für eine zum geregelten Katalysator gehörende Lambda-Sonde zu ersetzen. Dies erfor­dert einen erheblichen Aufwand, zumal in der Regel auch der komplette, die einzelnen Aggregate verbindende Kabelbaum ersetzt werden muß.Vehicles with an injection engine can be retrofitted with a regulated catalytic converter for exhaust gas purification. To this end, it is known to replace the existing injection control system with a new one with a connection for a lambda probe belonging to the regulated catalytic converter. This requires considerable effort, especially since the complete wiring harness that connects the individual units generally also has to be replaced.

Man könnte zwar auch die vorhandene Einspritz-Steuerung ent­sprechend umbauen. Dies hat jedoch den Nachteil, daß bei Ausfall der Steuerung eine Reparatur nur von wenigen Werk­statten durchgeführt werden könnte und daß eine "Tausch­reparatur" mit Austausch der Einspritz-Steuerung nur dann möglich ist, wenn eine passende, ebenfalls umgebaute Steu­erung zur Verfügung steht. Hinzu käme, daß auch hierbei der Austausch des Kabelbaumes erforderlich wäre.The existing injection control could also be modified accordingly. However, 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. In addition, it would also be necessary to replace the wiring harness.

Aufgabe der vorliegenden Erfindung ist es, einen Nachrüst­satz für Einspritz-Otto-Motoren zu schaffen, der in Verbin­dung mit der serienmäßig eingebauten, unveränderten Ein­spritzsteuerung sowie einem nachgerüsteten handelsüblichen Katalysator mit Lambda-Sonde eine Abgasreinigungsanlage mit geregeltem Drei-Wege-Katalysator ergibt, die eine erhebliche Reduzierung der Schafstoffemission ergibt. Dieser Nachrüst­satz soll so ausgebildet sein, daß der nachträgliche Einbau problemlos in kurzer Zeit und somit auch kostengünstig vor­genommen werden kann.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.

Zur Lösung dieser Aufgabe wird erfindungsgemäß insbesondere vorgeschlagen, daß der Nachrüstsatz einen Zusatzrechner auf­weist, der an die Lambda-Sonde und außerdem an wenigstens eine Verbindungsleitung zwischen einer Meßsonde und der Ein­spritz-Steuerung angeschlossen ist zur Veränderung wenig­stens eines von einer der Meßsonden kommenden Meßsignales im Sinne einer Änderung der Gemischaufbereitung und einer Nach­regelung auf ein optimales Luft-Kraftstoff-Verhältnis inner­halb des Lambda-Fensters.
Mit Hilfe des Zusatzrechners wird das für die Einspritz­Steuerung an sich "unverständliche" Meßsignal der Lambda-­Sonde umgesetzt in eine Größe, die von der vorhandenen Steuerung ausgewertet werden kann. Da die Gemischschaufbe­reitung durch die Steuerung unter anderem z. B. in Abhän­gigkeit von der Betriebstemperatur des Motors erfolgt, kann dem vom Temperaturfühler, dem Saugrohrdruckfühler usw. kom­menden Meßwert ein Korrekturwert überlagert werden, so daß der dann veränderte Meßwert eine entsprechende Reaktion der Einspritz-Steuerung auslösen kann. Dabei wird die Meßwert­änderung so vorgenommen, daß sich der für ein optimales Ar­beiten des Katalysators erforderliche Lambdawert 1 entspre­chend einem Luft-Kraftstoff-Verhältnis von 14,6 : 1 mit ge­gebenenfalls geringen Toleranzabweichungen einstellt. Dem­entsprechend wird beispielsweise bei Luftüberschuß, woraus sich ein Lambda-Wert größer als 1 ergibt, bei Verwendung der Motortemperatur als zu "manipulierendes" Meßsignal, der tat­sächlich gemessene Betriebs-Temperaturwert des Motors durch den überlagerten Korrekturwert zu niedrigeren Werten verän­dert, worauf die Einspritz-Steuerung mit einer Kraftstoff­anreicherung des Gemisches reagiert. Dies wiederum führt zu einer Verkleinerung des Lambdawertes. Die Nachregelung der Einspritz-Steuerung erfolgt somit durch Simulation von an sich "falschen" Meßdaten. Falls der zur Einspritz-Steuerung gehörende Rechner vergleichsweise schnelle, das heißt in kurzen Zeitabständen erfolgende Meßdatenänderungen insbeson­dere bei seinem die Motortemperatur betreffenden Eingang als Fehler interpretiert, können auch andere Meßsignale, die sich während des Betriebes sowie so in einem vergleichsweise großen Bereich ändern, zur Überlagerung des Meßwertes mit einem Korrekturwert verwendet werden. Anstatt des Tempera­turmeßwertes wird in diesem Falle bevorzugt der Ansaugrohr­unterdruck-Meßwert verwendet.
Der erfindungsgemäße Nachrüstsatz erfordert keine Eingriffe in das vorhandene System. Der Anschluß erfolgt durch ein­faches Umstecken der vorhandenen Verbindungsleitung zwischen dem jeweils verwendeten Meßwertfühler und der Einspritz­Steuerung und durch Anschluß an das Bordnetz zur Stromver­sorgung.To solve this problem, 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.
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. 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. 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. This in turn leads to a reduction in the lambda value. 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.

Vorzugsweise weist der Zusatzrechner einen in Reihe zu einem Sensorwiderstand geschalteten, veränderbaren Widerstand als Stellglied für die Simulation der Meßgrößenänderung auf. Durch diese Anordnung läßt sich der Widerstandswert des jeweiligen Meßkreises vergrößern und somit das Luft-Kraft­stoff-Gemisch anfetten. Dabei wird ausgenutzt, daß die Grundeinstellung der vorhandenen Einspritz-Steuerung einen Lambda-Wert größer als 1 ergibt, so daß hier eine Regelung zu größeren Meßkreis-Widerstandswerten, z. B. entsprechend der Simulation niedrigerer Betriebstemperaturwerte, genügt. Gegebenenfalls läßt sich auch die vorhandene Grundeinstel­lung entsprechend korrigieren.
Vorteilhaft ist bei dieser Anordnung auch, daß bei einem Defekt des Zusatz-Rechners nicht die Gefahr der vollständi­gen Abmagerung des Gemisches und damit die Gefahr eines Motorschadens besteht, da bei niederohmigem Wert bis zum Kurzschluß des veränderbaren Widerstandes des Zusatz-Rech­ners sich im Extremfall die ursprünglichen Verhältnisse wie beim Betrieb alleine mit der serienmäßigen Einspritz-Steu­erung einstellen würden. Im umgekehrten Falle würde sich eine für den Motor ungefährliche Gemischanreicherung er­geben.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. With this arrangement, the resistance value of the respective measuring circuit can be increased and thus the air-fuel mixture can be enriched. This takes advantage of the fact that the basic setting of the existing injection control system results in a lambda value greater than 1, so that here regulation to larger measuring circuit resistance values, e.g. B. corresponding to the simulation of lower operating temperature values, is sufficient. If necessary, the existing basic setting can also be corrected accordingly.
It is also advantageous with this arrangement that in the event of a defect in the additional computer, there is no risk of the mixture becoming completely lean, and thus of engine damage, since, in the case of a low resistance, the original resistance may be short-circuited until the variable resistance of the additional computer is short-circuited Setting the conditions as when operating alone with the standard injection control. In the opposite case, a mixture enrichment that is harmless for the engine would result.

Nach einer Weiterbildung der Erfindung ist vorgesehen, daß der Zusatzrechner über eine Steuerleitung mit einem Ventil verbunden ist, das sich in einer Verbindungsleitung zwischen dem Tank und dem Benzineinspritzsystem befindet und daß der Zusatz rechner zur Steuerung dieses Ventiles Meßeingänge zu­mindest für die Motordrehzahl sowie die Motortemperatur auf­weist.
Mit Hilfe dieses vom Zusatzrechner gesteuerten Ventiles kann gezielt in Abhängigkeit des jeweiligen Betriebszustandes des Motors, das Ableiten von Benzindämpfen aus dem Tank in das Kraftstoff-Luftgemisch erfolgen, und zwar zweckmäßigerweise dann, wenn die Kohlenwasserstoffemission einen niedrigen Wert hat.According to a development of the invention, it is provided that 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 .
With the help of 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.

Zusätzliche Ausgestaltungen der Erfindung sind in den wei­teren Unteransprüchen aufgeführt. Nachstehend ist die Er­findung anhand der Zeichnung noch näher erläutert.Additional embodiments of the invention are listed in the further subclaims. The invention is explained in more detail below with reference to the drawing.

Die einzige Figur zeigt:
eine schematische Darstellung eines mit einer Benzinein­spritzanlage ausgerüsteten Otto-Motors und geregeltem Drei­ wege-Katalysator.The only figure shows:
is a schematic representation of a petrol engine equipped with a gasoline injection system and regulated three way catalyst.

Ein in der Figur gezeigter Otto-Motor 1 ist mit einer Ben­zin-Einspritzanlage 2 ausgerüstet, die mit einer Einspritz­Steuerung 3 verbunden ist. Diese Einspritzsteuerung 3 weist eine Reihe von Meßeingängen 4 auf, wobei die hier zugeführ­ten Meßdaten von einem zur Einspritz-Steuerung 3 gehörenden Rechner verarbeitet werden. Bei diesen Meßeingängen 4 werden beispielsweise Daten betreffend die Drehzahl, den Ansaug­rohrunterdruck, die Außentemperatur, die Motortemperatur, die Drosselklappenstellung, die Stellung des Leerlauf-CO-­Potentiometers, die Ansauglufttemperatur und dergleichen zugeführt.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. At these measuring inputs 4, 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.

Alle diese zugeführten Daten werden verarbeitet und die Benzineinspritzanlage 2 wird dementsprechend durch die Ein­spritz-Steuerung 3 auf die jeweils für die bestimmten Be­triebsverhältnisse optimale Gemischaufbereitung eingestellt.All these supplied data are processed and the gasoline injection system 2 is accordingly adjusted by the injection control 3 to the mixture preparation that is optimal for the particular operating conditions.

Bei einem solchen Otto-Motor mit Benzineinspritzanlage soll nun zur Reduzierung der Schadstoffemission ein Drei-Wege-­Katalysator nachgerüstet werden. In das Auspuffrohr 5 wird dazu ein Katalysator 6 sowie eine Lambda-Sonde 7 eingebaut. Mit Hilfe der Lambda-sonde ist eine Kontrolle des Luft-­Kraftsoffverhältnisses möglich. Wesentlich ist hierbei, daß die Abgaszusammensetzung in einem für die optimale Wirkung des Katalysators erforderlichen Bereich, dem sogenannten Lambdafenster gehalten wird. Die von der Lambda-Sonde 7 kommenden Meßdaten können von der vorhandenen Einspritz­Steuerung nicht verarbeitet werden. Um nun dies zu ermög­lichen, weist der erfindungsgemäße Nachrüstsatz zusätzlich zu dem Katalysator 6 und der Lambda-Sonde 7 einen Zusatz­rechner 8 auf. Dieser ist einerseits über eine Verbindungs­leitung 9 an die Lambda-Sonde 7 und außerdem an eine oder mehrere Verbindungsleitungen zwischen einer die vorgenannten Meßgrößen betreffenden Meßsonde und der Einspritz-Steuerung 3 angeschlossen. Im dargestellten Ausführungsbeispiel ist der Zusatzrechner an die Verbindungsleitung 10 zwischen einem Temperaturfühler 11 am Motor 1 und der Einspritz-­Steuerung 3 angeschlossen.In a gasoline engine of this type with a gasoline injection system, a three-way catalytic converter is now to be retrofitted to reduce pollutant emissions. For this purpose, 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. It is essential here that 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. In order to make this possible, the retrofit kit according to the invention has an additional computer 8 in addition to the catalytic converter 6 and the lambda probe 7. This is on the one hand via 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. In the illustrated embodiment, the additional computer is connected to the connecting line 10 between a temperature sensor 11 on the engine 1 and the injection control 3.

Die Kraftstoff-Einspritzmenge ist stark von der Motortempe­ratur abhängig. Bei geringerer Motortemperatur wird das Kraftstoff-Luftgemisch angefettet, während bei zunehmender Betriebstemperatur der Luftanteil erhöht und damit das Ge­misch abgemagert wird. Dabei wird insbesondere auch bei Ver­wendung eines Katalysators ein Luft-Kraftstoff-Verhältnis von 14,6 : 1 angestrebt. Dies entspricht einem Lambdawert gleich 1. Mit Hilfe der Lambda-Sonde kann nun kontrolliert werden, ob diese optimale Gemischzusammensetzung vorhanden ist.
Der serienmäßig eingebauten Einspritz-Steuerung 3 wird nun z. B. über die Temperaturmeß-Leitung 10 von dem Zusatzrech­ner 8 ein überlagertes Korrektursignal zugeführt. Da er u.­a. auch in Abhängigkeit dieses Signales die Kraftstoff-Ein­spritzanlage variieren kann, besteht nun die Möglichkeit, das von der Lambda-Sonde 7 kommende Meßsignal durch den Zu­satzrechner 8 umzusetzen und einen Temperaturmeßwert zu simulieren, der die Einspritz-Steuerung 3 veranlaßt, eine Korrektur der Einspritzmenge im Sinne einer Regelung auf einen Lambda-Wert 1 vorzunehmen.
üblicherweise besteht der Temperaturfühler 11 am Motor 1 aus einem temperaturabhängigen Widerstand mit einem negativen Temperaturkoeffizienten. Dies bedeutet, daß mit zunehmender Temperatur der Widerstand des Temperaturfühlers abnimmt. Be­vorzugt ist nun vorgesehen, daß innerhalb des Zusatzrechners 8 ein in Reihe zum Temperaturfühler geschalteter, veränder­barer Widerstand - zum Beispiel ein Transistor - vorgesehen ist. Damit kann der Widerstand des Temperatur-Meßkreises vergrößert werden. Eine Vergrößerung des Meßkreiswiderstan­ des interpretiert die Einspritz-Steuerung 3 jedoch als Tem­peraturabsenkung und würde dann das Kraftstoff-Luftgemisch anreichern, d. h. die Benzineinspritzmenge vergrößern. In der Praxis genügt die Regelung im Anfettungsbereich, da die Benzineinspritzanlagen bzw. deren Einspritz-Steuerung in der Regel mager eingestellt sind, was einem Lambdawert größer als 1 entsprechen würde. Da man für ein optimales Arbeiten des Katalysators aber einen Lambdawert von 1 anstrebt, ist in jedem Falle eine (geringe) Verschiebung zu einem fetteren Gemisch erforderlich.
Allerdings besteht auch die Möglichkeit, daß dem Temperatur­fühler-Widerstand innerhalb des Zusatzrechners 8 ein verän­derbarer Widerstand parallel geschaltet ist und daß ein zu dieser Parallelschaltung in Reihe geschalteter, weiterer veränderbarer Widerstand vorgesehen ist. Dadurch kann der Widerstandswert des Temperaturfühlers sowohl zu kleineren als auch zu größeren Werten verändert werden. Wie bereits vorerwähnt, hat es sich jedoch in praktischen Versuchen gezeigt, daß eine Reihenschaltung des Temperaturfühler-­Widerstandes und eines veränderbaren Widerstandes als Stell­glied für die Simulation der Meßwertänderung genügt.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. Since he 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. An increase in the measuring circuit resistance However, 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. In practice, 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. However, since 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.
However, there is also the possibility that 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. As a result, the resistance value of the temperature sensor can be changed to both smaller and larger values. As already mentioned, however, it has been shown in practical tests that 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.

Der Zusatz rechner beinhaltet neben seinem Regelprogramm vor­zugsweise auch ein Not-Programm zur Erzeugung von etwa Lamb­da gleich 1 entsprechenden Steuersignaien bei Ausfall und/­oder Störung der Eingangsmeßsignale. Auch ergibt sich schon systembedingt durch eine Reihenschaltung des Meßsonden-­Widerstandes und des veränderbaren Stellglied-Widerstandes ein weiterer Sicherheitsfaktor, da ein unkontrolliertes Ab­magern des Motors hierbeinicht auftreten kann. Würde sich bei dem in Reihe geschalteten, veränderbaen Widerstand ein Kurzschluß einstellen, so ergäben sich die gleichen Verhält­nisse wie bei der ursprünglichen, serienmäßigen Einstellung. Würde sich der Widerstand zu höheren Werten verändern oder eine Unterbrechung aufweisen, so würde lediglich ein über­ fetten des Gemisches erfolgen, was aber beim Motor keinen Schaden hervorrufen würde. Auch läßt sich in diesem Falle auf einfachste Weise durch einfaches Umstecken der Verbin­dungsleitung 10 der ursprüngliche Zustand wieder herstellen. Gegebenenfalls könnte hierzu auch ein auch vom Laien bedien­barer Umschalter vorgesehen sein.
Wie in der Figur erkennbar, ist der am Ende der4 Verbindungs­leitung 10 vorhandene Steckanschluß 12 nicht mehr direkt mit dem Temperaturfühler 11, sondern mit dem Zusatzrechner 8 verbunden, der seinerseits einen Steckanschluß 12a hat, der anstatt des Steckanschlusses 12 mit dem Temperaturfühler 11 verbunden ist. Hieraus wird auch deutlich, daß keinerlei Eingriff in das vorhandene System erforderlich ist.In addition to its control program, 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. 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. If necessary, a switch that can also be operated by the layperson could also be provided for this purpose.
As can be seen in the figure, 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.

Um noch strengeren Abgasnormen zu entsprechen, kann der Tank und das Benzineinspritzsystem über eine Leitung miteinander verbunden sein, innerhalb der sich ein Ventil 14 befindet. über dieses Ventil können in bestimmten Betriebssituationen des Motors Benzindämpfe dem Luft-Kraftstoffgemisch beige­geben werden. Innerhalb der Verbindungsleitung zwischen Tank und Benzineinspritzsystem kann zur Bindung von Schadstoffen noch eine Kohleaktivfilter eingesetzt sein. Das Ventil 14 wird von dem Zusatzrechner 8 gesteuert. Der Zusatzrechner 8 ist dazu mit Meßeingängen 15 für die Motordrehzahl sowie einem Meßeingang 16 für die Betriebstemperatur des Motors verbunden. Die Meßeingänge 15 sind im Ausführungsbeispiel an die Zündspule 17 angeschlossen, während der Meßeingang 16 an einen weiteren Temperaturfühler 18, der auch an eine Tempe­raturanzeige 19 angeschlossen ist, verbunden ist. Aus diesen Meßdaten wird der Betriebszustand erkannt, bei dem Benzin­dämpfe dem Motor zugeführt werden können. Dies ist dann der Fall, wenn der Kohlenwasserstoffanteil in den Abgasen gering ist.In order to meet even stricter exhaust gas standards, the tank and the gasoline injection system can be connected to one another via a line, within which a valve 14 is located. In certain operating situations of the engine, 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. In the exemplary embodiment, 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.

Wenn das Fahrzeug mit einer Schubschaltung 21 versehen ist, kann der dann vorhandene Drosselklappenschalter mit dem Zu­satzurechner 8 verbunden sein, um im Schiebebetrieb Fehl­funktionen zu vermeiden.
Mit 20 ist noch ein Anschluß zur Eigendiagnose des Zusatz­rechners 8 bezeichnet.
Der Nachrüstsatz kann zusätzlich zu dem Rechner 8 einen je­weils für den bestimmten Fahrzeugtyp konfektioneierten Ka­belbaum mit entsprechenden Steckanschlüssen aufweisen. Da­durch ist in kürzester Zeit ein Einbau dieses Nachrüstsatzes ohne spezielle Kenntnisse durchführbar. Komplizierte Ein­griffe in das vorhandene System können dabei vermieden werden.
Ein wesentlicher Vorteil des erfindungsgemäßen Systems be­steht noch darin, daß bei Ausfall des Zusatzrechners 8 der Motor nicht stehenbleibt und somit weitergefahren werden kann.If the vehicle is provided with a push switch 21, 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.
With 20 a connection for self-diagnosis of the additional computer 8 is designated.
In addition to the computer 8, 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.

Erwähnt sei noch, daß bei ruckelempfindlichen Motoren die Lambda-Regelung erst bei 1400 bis 1700 Umdrehungen/min ein­setzt, da in diesen Drehzahlbereichen z. B. bei Lambda-­Werten von 0,98 bis 0,99 nur wenig Stickoxid produziert und Kohlenwasserstoff trotzdem noch gut oxidiert wird. Der Einfachheit halber ist es zweckmäßig, jeweils nur ein Meßsignal zur Nachregelung der Gemischaufbereitung zu mani­pulieren. Prinzipiell ist aber auch ein gleichzeitiges Än­dern mehrerer Meßdaten und gegebenenfalls auch in unter­schiedlichem Maße möglich.It should also be mentioned that in jerk-sensitive engines, the lambda control only starts at 1400 to 1700 revolutions / min. B. at lambda values of 0.98 to 0.99 produces only a little nitrogen oxide and hydrocarbon is still well oxidized. For the sake of simplicity, it is expedient to manipulate only one measurement signal to readjust the mixture preparation. In principle, however, it is also possible to change several measurement data simultaneously and, if necessary, to different degrees.

Alle in der Beschreibung, den Ansprüchen und der Zeichnung dargestellten Merkmale können sowohl einzeln als auch in be­liebiger Kombination miteinander erfindungswesentlich sein.All the features shown in the description, the claims and the drawing can be essential to the invention both individually and in any combination with one another.

Claims (10)

1. Nachrüstsatz zum Nachrüsten von Benzineinspritzanlagen für Otto-Motoren mit einem eine Lambda-Sonde aufweisen­den, geregelten Katalysator, wobei die Benzineinspritz­anlage eine Einspritz-Steuerung mit einem Rechner auf­weist, der mit Meßsonden für den Betriebszustand des Motors, z. B. einen Temperaturfühler, einem Saugrohr­druckfühler, einem Ansauglufttemperaturfühler und der­gleichen in Steuerverbindung steht, dadurch gekennzeichnet, daß der Nachrüstsatz einen Zusatzrechner (8) aufweist, der an die Lambda-Sonde (7) und außerdem an wenigstens eine Verbindungsleitung (10) zwischen einer Meßsonde und der Einspritz-Steuerung (3) angeschlossen ist zur Veränderung wenigstens eines von einer Meßsonde kommenden Meßsignales im Sinne einer Änderung der Gemischaufbereitung und einer Nachregelung auf ein optimales Luft-Kraftstoff-Verhältnis innerhalb des Lambda-Fensters.1. Retrofit kit for retrofitting gasoline injection systems for Otto engines with a controlled catalyst having a lambda probe, the gasoline injection system having an injection control with a computer, which uses measuring probes for the operating state of the engine, e.g. B. is a temperature sensor, an intake manifold pressure sensor, an intake air temperature sensor and the like in control connection, characterized in that the retrofit kit has an additional computer (8) to the lambda probe (7) and also to at least one connecting line (10) between a measuring probe and the injection control (3) is connected to change at least one measurement signal coming from a measuring probe in the sense of a change in the mixture preparation and a readjustment to an optimal air-fuel ratio within the lambda window. 2. Nachrüstsatz nach Anspruch 1, dadurch gekennzeichnet, daß der Zusatzrechner (8) einen in Reihe zu einem Sen­sorwiderstand geschalteten, veränderbaren Widerstand als Stellglied für die Simulation der Meßgrößenänderung auf­weist.2. Retrofit kit according to claim 1, characterized in that the additional computer (8) has a variable resistor connected in series with a sensor resistor as an actuator for the simulation of the change in measured variables. 3. Nachrüstsatz nach Anspruch 1 oder 2, dadurch gekenn­zeichnet, daß der Zusatzrechner (8) einen parallel zum Sensorwiderstand geschalteten, veränderbaren Widerstand sowie einen zu dieser Parallelschaltung in Reihe ge­schalteten, weiteren, veränderlichen Widerstand als Stellglieder für die Simulation der Meßgrößenänderung aufweist.3. Retrofit kit according to claim 1 or 2, characterized in that the additional computer (8) has a variable resistor connected in parallel with the sensor resistor and a further variable resistor connected in series with this parallel circuit as actuators for the simulation of the change in measured variables. 4. Nachrüstsatz nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß zur Änderung der Gemischaufbereitung der Zusatzrechner mit einem Motor-Temperaturfühler (11), vorzugsweise mit dem an ein Anzeigeinstrument ange­schlossenen Temperaturfühler verbunden ist.4. Retrofit kit according to one of claims 1 to 3, characterized in that for changing the mixture preparation, the additional computer is connected to an engine temperature sensor (11), preferably to the temperature sensor connected to a display instrument. 5. Nachrüstsatz nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß zur Änderung der Gemischaufbereitung der Zusatzrechner (8) an den Saugrohrdruckfühler und/­oder an ein Drosselklappenpotentiometer und/oder an den Ansauglufttemperaturfühler und/oder an das Leerlauf-CO-­Potentiometer angeschlossen ist.5. Retrofit kit according to one of claims 1 to 4, characterized in that for changing the mixture preparation, the additional computer (8) is connected to the intake manifold pressure sensor and / or to a throttle valve potentiometer and / or to the intake air temperature sensor and / or to the idling CO potentiometer is. 6. Nachrüstsatz nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Zusatzrechner (8) über eine Steuerleitung mit einem Ventil (14) verbunden ist, das sich in einer Verbindungsleitung zwischen dem Tank und dem Benzineinspritzsystem befindet und daß der Zusatz­rechner (8) zur Steuerung dieses Ventils Meßeingänge (15, 16) zumindet für die Motordrehzahl sowie die Motor­temperaturaufweist.6. retrofit kit according to one of claims 1 to 5, characterized in that the additional computer (8) is connected via a control line to a valve (14) which is located in a connecting line between the tank and the gasoline injection system and that the additional computer (8 ) to control this valve has measuring inputs (15, 16) at least for the engine speed and the engine temperature. 7. Nachrüstsatz nach Anspruch 6, dadurch gekennzeichnet, daß er in der das Ventil (14) aufweisenden Verbindungs­leitung einen Kohleaktivfilter zum Zuführen von Benzin­dämpfen aus dem Tank zum Motor aufweist.7. Retrofit kit according to claim 6, characterized in that it has a carbon active filter for supplying gasoline vapors from the tank to the engine in the connecting line having the valve (14). 8. Nachrüstsatz nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß der Zusatzrechner (8) einen Meßein­gang zur Erfassung der Schubabschaltung aufweist und dazu vorzugsweise an einen Drosselklappenschalter ange­schlossen ist.8. retrofit kit according to one of claims 1 to 7, characterized in that the additional computer (8) has a measuring input for detecting the fuel cut-off and is preferably connected to a throttle valve switch. 9. Nachrüstsatz nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß er den Zusatzrechner (8) mit einem für bestimmte Fahrzeugtypen konfektionierten Kabelbaum vorzugsweise mit Steckanschlüssen zumindest für den Motor-Wärmefühler (11), den Wärmefühler-Steckanschluß (12) der Einspritz-Steuerung (3) sowie die Lambda-Sonde (7) umfaßt und daß gegebenenfalls weitere Anschlüsse, vorzugsweise Steckanschlüsse für die Zündspule (17) oder dergleichen und für einen insbesondere weiteren vorhan­denen Temperaturfühler (18) vorgesehen sind.9. retrofit kit according to one of claims 1 to 8, characterized in that it the additional computer (8) with a cable harness assembled for certain vehicle types preferably with plug connections at least for the engine heat sensor (11), the heat sensor plug connection (12) of the injection control (3) and the lambda probe (7) and that optionally further connections, preferably plug connections for the ignition coil (17) or the like and are provided for a particular further existing temperature sensor (18). 10. Nachrüstsatz nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß der Zusatzrechner (8) neben seinem Regelprogramm ein Not-Programm zur Erzeugung von etwa Lambda gleich 1 ensprechenden Steuersignalen bei Ausfall und/oder Störung der Eingangsmeßsignale beinhaltet.10. Retrofit kit according to one of claims 1 to 9, characterized in that the additional computer (8) contains in addition to its control program an emergency program for generating approximately lambda equal to 1 corresponding control signals in the event of failure and / or malfunction of the input measurement signals.
EP90120767A 1989-11-04 1990-10-30 Conversion kit for otto engines Expired - Lifetime EP0427087B1 (en)

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DE3936820 1989-11-04
DE3936820 1989-11-04
DE4001334 1990-01-18
DE4001334A DE4001334A1 (en) 1989-11-04 1990-01-18 RETROFIT KIT FOR OTTO ENGINES

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WO1999028603A2 (en) * 1997-11-30 1999-06-10 Wissenschaftliche Werkstatt Für Umweltmesstechnik Gmbh Measurement of contaminant components in exhaust gas and reduction of excessive contaminant emissions during cold starts and while driving
WO1999028603A3 (en) * 1997-11-30 1999-08-19 Wissenschaftliche Werkstatt Fu Measurement of contaminant components in exhaust gas and reduction of excessive contaminant emissions during cold starts and while driving
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 (en) * 2006-03-31 2007-10-18 Avg Gmbh Retrofitting module for vehicles having a controlled catalytic converter

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EP0427087A3 (en) 1991-11-06
DE59001169D1 (en) 1993-05-13
DE4001334A1 (en) 1991-05-08
EP0427087B1 (en) 1993-04-07

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