EP0647775B1 - Apparatus for regulating the idling speed of the engine of a vehicle - Google Patents

Apparatus for regulating the idling speed of the engine of a vehicle Download PDF

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Publication number
EP0647775B1
EP0647775B1 EP94113276A EP94113276A EP0647775B1 EP 0647775 B1 EP0647775 B1 EP 0647775B1 EP 94113276 A EP94113276 A EP 94113276A EP 94113276 A EP94113276 A EP 94113276A EP 0647775 B1 EP0647775 B1 EP 0647775B1
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EP
European Patent Office
Prior art keywords
catalytic converter
temperature
engine
internal combustion
injection valves
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.)
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EP94113276A
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German (de)
French (fr)
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EP0647775A2 (en
EP0647775A3 (en
Inventor
Gerhart Huemer
Heinz Lemberger
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication of EP0647775A3 publication Critical patent/EP0647775A3/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
    • F02D41/1441—Plural sensors
    • F02D41/1443—Plural sensors with one sensor per cylinder or group of cylinders
    • 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
    • F02D41/008—Controlling each cylinder individually
    • F02D41/0087—Selective cylinder activation, i.e. partial cylinder operation
    • 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
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • F01N2430/02—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by cutting out a part of engine cylinders

Definitions

  • the invention relates to a device according to the preamble of the claim 1.
  • the internal combustion engine is idling when the motor vehicle is stationary is operated by firing all cylinders, this can be especially in the case of large-volume, four-cylinder internal combustion engines to critical thermal behavior lead if the amount of heat generated by the combustion is missing Airflow through the coolant can not be dissipated.
  • a method for fuel injection is known from DE 36 23 040 A1 which the injection is switched off sequentially in overrun mode. A lifting the injection shutdown due to a low catalyst temperature not known from this document.
  • This object is achieved in a device for idle control of a motor vehicle internal combustion engine with exhaust gas catalytic converter and lambda probe solved in that the means for switching off the injection valves are designed such that the injection valves in idle mode of the internal combustion engine depending on the internal combustion engine firing order can be switched off sequentially according to a specified program are.
  • This embodiment of the invention is also suitable for 6-cylinder internal combustion engines.
  • the exhaust gas catalytic converter does not fall below that for a proper exhaust gas conversion can cool down the required temperature.
  • This has an improved exhaust emission behavior of the internal combustion engine Episode.
  • the invention can, in particular, the thermal behavior in large-volume internal combustion engines in idle mode when the cooling Impact of the airstream is missing, can be significantly improved.
  • the sequential shutdown takes place the injection valves only when the internal combustion engine is idling, if the coolant temperature of the internal combustion engine is greater than 80 ° C and / or the air temperature in the intake air collector is greater than 20 ° C. So that is achieved that the single cylinder shutdown only when the engine is idling when the internal combustion engine is warm and / or when the outside temperature is sufficiently warm he follows.
  • the sequential shutdown of the injection valves only at one Vehicle speed greater than 5 km / h canceled.
  • the temperature of the catalytic converter by measuring or monitoring the electrical voltage of the lambda probe assigned to the exhaust gas catalytic converter.
  • the logic diagram of FIG. 1 shows the functioning of a device for idle control of a motor vehicle internal combustion engine with two rows of cylinders, each of which is assigned an exhaust gas catalytic converter with a lambda probe.
  • the OR gate 1 receives as input variables the information as to whether the coolant temperature T K is greater than 80 ° C and the further information as to whether the air temperature T S in the intake air collector of the internal combustion engine is greater than 20 ° C. In the case of an internal combustion engine that is at operating temperature and not exactly extremely wintry ambient temperatures, the OR gate 1 then emits an enable signal to a first AND gate 2. As a further input variable, this first AND gate 2 is supplied with the information as to whether the speed V FZG of the motor vehicle is less than 5 km / h.
  • the first AND gate 2 outputs a logic signal "1" to the second AND gate 3.
  • the second AND gate 3 receives a further logic signal "1" at its second input. This fulfills all of the requirements that the injection valves of one of the two cylinder rows can be switched off when the internal combustion engine is idling. This result is stored in the memory element 4 until any change. The memory element 4 passes this information on to the two subsequent AND elements 5 and 6.
  • the AND gate 5 receives the information about the voltage U L1 of the first lambda probe of the first exhaust gas catalytic converter at its second input
  • the AND gate 6 receives the information about the voltage U L2 of the second lambda probe of the second input second catalytic converter.
  • the logic diagram of Fig. 2 represents the operation of the invention. It is identical to the logic diagram of FIG. 1 in the first three logic elements 1, 2 and 3. Also in the embodiment of FIG. 2, the AND gate 3 sends a logical "1" signal to the AND gate 8 when the coolant temperature T K is greater than 80 ° C and / or the air temperature T S in the air collector of the internal combustion engine is greater Is 20 ° and in addition the vehicle speed V FZG is less than 5 km / h and finally the internal combustion engine is operated at idle, ie the idle contact is closed. At its second input, this AND gate 8 receives the information as to whether the electrical voltage U L of the lambda probe of the exhaust gas catalytic converter is greater or less than a limit voltage U G.
  • the injectors can be switched off sequentially depending on the engine ignition sequence according to a predetermined program when the internal combustion engine is idling.
  • the voltage of the lambda probe U L falls below the limit value U G , then this means that the exhaust gas catalytic converter has already cooled down to its minimum temperature required for the proper conversion, and consequently the sequential injection valve shutdown is canceled again at least for a predetermined period of time got to. Only when the exhaust gas catalytic converter has reached a sufficiently high operating temperature again, that is, when the electrical voltage U L of the lambda probe is again greater than the limit voltage U G , can the injection valves be switched off sequentially again. The sequential shutdown of the injection valves of the internal combustion engine is then carried out by the internal combustion engine control unit 9.
  • the diagram of FIG. 3 shows the relationship between the electrical voltage U L of the lambda probe as a function of the temperature T of the associated exhaust gas catalytic converter.
  • the electrical voltage U L of the lambda probe decreases with decreasing temperature T of the exhaust gas catalytic converter.
  • the limit temperature T G shown in the diagram of FIG. 3 represents the minimum temperature that the exhaust gas catalytic converter must have in order for it to function properly. In the diagram, this limit temperature T G corresponds to a limit voltage U G. If the exhaust gas catalytic converter of the internal combustion engine cools below the operating temperature T G due to an excessively long sequential shutdown of the injection valves, then the electrical voltage U L of the associated lambda probe drops below the limit value U G. Because of this relationship, the voltage U L of the lambda probe can be used as a measure of the temperature of the associated exhaust gas catalytic converter, so that a separate temperature sensor can be saved.
  • the internal combustion engine becomes a reduction while maintaining the exhaust gas quality fuel consumption and an improvement in thermal behavior the internal combustion engine reached.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Description

Die Erfindung betrifft eine Vorrichtung nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a device according to the preamble of the claim 1.

Es ist bereits bekannt, auch bei nur kurzfristigem Stillstand eines Kraftfahrzeuges, dessen Brennkraftmaschine während der Stillstandsphase abzuschalten. Diese bekannte Vorrichtung wird häufig als "Start-Stop-Automatik" bezeichnet. Bei dieser "Start-Stop-Automatik" werden mit dem Abstellen der Brennkraftmaschine alle Zylinder abgeschaltet. Dies hat den Nachteil, dass der Abgaskatalysator der Brennkraftmaschine sehr schnell auskühlt und folglich nach dem Brennkraftmaschinenstart wieder auf die erforderliche Konvertierungstemperatur durch entsprechendes Anfetten des Ansauggemisches gebracht werden muss. Dies wirkt sich jedoch negativ auf die Abgasemissionen sowie auf den Kraftstoffverbrauch aus.It is already known, even when a motor vehicle is only at a short standstill, switch off its internal combustion engine during the standstill phase. This well-known Device is often referred to as an "automatic start-stop". At this All cylinders are switched off when the internal combustion engine is switched off off. This has the disadvantage that the exhaust gas catalytic converter of the internal combustion engine cools down very quickly and consequently after engine start back to the required conversion temperature by appropriate Greasing of the intake mixture must be brought. However, this has a negative effect on exhaust emissions and fuel consumption.

Wenn dagegen die Brennkraftmaschine bei stehendem Kraftfahrzeug im Leerlauf durch Befeuerung aller Zylinder betrieben wird, kann dies insbesondere bei großvolumigen, vierzylindrigen Brennkraftmaschinen zu einem kritischen thermischen Verhalten führen, wenn die durch die Verbrennung erzeugte Wärmemenge bei fehlendem Fahrtwind durch das Kühlmittel nicht abgeführt werden kann.If, on the other hand, the internal combustion engine is idling when the motor vehicle is stationary is operated by firing all cylinders, this can be especially in the case of large-volume, four-cylinder internal combustion engines to critical thermal behavior lead if the amount of heat generated by the combustion is missing Airflow through the coolant can not be dissipated.

In der gattungsbildenden US 4,134,261 ist ein Verbrennungsmotor mit zwei Zylinderreihen beschrieben, denen jeweils ein Katalysator und eine Lambda-Sonde zugeordnet ist. Bei niedriger Last kann wechselseitig eine Zylinderreihe abgeschaltet werden, wobei dann auf die andere Zylinderreihe umgeschaltet wird, wenn deren Katalysator eine vorgegebene Grenztemperatur unterschreitet. Durch die Zuordnung jeweils eines Katalysators und einer Lambda-Sonde zu einer bestimmten Zylinderreihe kann eine fehlerverursachende Beeinflussung der Motorsteuerung über den abgeschalteten Strang vermieden werden. Ein teilweiser Betrieb jeweils eines Abgasstranges wird damit nicht Erwägung gezogen.In the generic US 4,134,261 is an internal combustion engine with two rows of cylinders described, each associated with a catalyst and a lambda probe is. A cylinder bank can be switched off at low loads will be switched to the other row of cylinders when their Catalyst falls below a predetermined limit temperature. By assignment one catalytic converter and one lambda probe for a specific cylinder bank can influence the engine control system to cause a fault the switched-off line can be avoided. A partial operation one at a time Exhaust line is not considered.

Aus der DE 36 23 040 A1 ist ein Verfahren zur Kraftstoffeinspritzung bekannt, bei dem die Einspritzung im Schubbetrieb sequentiell abgeschaltet wird. Eine Aufhebung der Einspritzabschaltung aufgrund einer niedrigen Katalysatortemperatur ist aus diesem Dokument nicht bekannt.A method for fuel injection is known from DE 36 23 040 A1 which the injection is switched off sequentially in overrun mode. A lifting the injection shutdown due to a low catalyst temperature not known from this document.

Ausgehend vom gattungsbildenden Stand der Technik ist es daher Aufgabe der Erfindung, eine Vorrichtung eingangs genannter Art derart weiterzubilden, dass bei jeder Motorkonstruktion je nach Anforderung eine stufenweise Leistungsreduktion möglich ist, wobei aber weiterhin die Abgasqualität im Leerlauf beibehalten wird.Starting from the generic state of the art, it is therefore the task of Invention to develop a device of the type mentioned in such a way that at every engine design, depending on requirements, a gradual reduction in performance is possible, but still maintain the exhaust gas quality at idle becomes.

Diese Aufgabe wird bei einer Vorrichtung zur Leerlaufsteuerung einer Kraftfahrzeug-Brennkraftmaschine mit Abgaskatalysator und Lambda-Sonde dadurch gelöst, dass die Mittel zum Abschalten von Einspritzventilen so ausgebildet sind, dass die Einspritzventile im Leerlaufbetrieb der Brennkraftmaschine abhängig von der Brennkraftmaschinen-Zündfolge nach einem vorgegebenen Programm sequentiell abschaltbar sind.This object is achieved in a device for idle control of a motor vehicle internal combustion engine with exhaust gas catalytic converter and lambda probe solved in that the means for switching off the injection valves are designed such that the injection valves in idle mode of the internal combustion engine depending on the internal combustion engine firing order can be switched off sequentially according to a specified program are.

Diese Ausgestaltung der Erfindung eignet sich auch bereits bei 6-Zylinder-Brennkraftmaschinen.This embodiment of the invention is also suitable for 6-cylinder internal combustion engines.

Durch die Erfindung wird erreicht, dass der Abgaskatalysator nicht unter die für eine ordnungsgemäße Abgaskonvertierung erforderliche Temperatur abkühlen kann. Dies hat ein verbessertes Abgasemissionsverhalten der Brennkraftmaschine zur Folge. Femer kann durch die Abschaltung einzelner Zylinder im Leerlaufbetrieb der Brennkraftmaschine deren Kraftstoffverbrauch im Leerlauf um ca. 35 % reduziert werden. Schließlich kann durch die Erfindung das thermische Verhalten, insbesondere bei großvolumigen Brennkraftmaschinen im Leerlaufbetrieb, wenn die kühlende Wirkung des Fahrtwindes fehlt, deutlich verbessert werden.It is achieved by the invention that the exhaust gas catalytic converter does not fall below that for a proper exhaust gas conversion can cool down the required temperature. This has an improved exhaust emission behavior of the internal combustion engine Episode. Furthermore, by switching off individual cylinders in idle mode, the Internal combustion engine whose fuel consumption is reduced by approximately 35% when idling become. Finally, the invention can, in particular, the thermal behavior in large-volume internal combustion engines in idle mode when the cooling Impact of the airstream is missing, can be significantly improved.

Gemäß einer vorteilhaften Weiterbildung der Erfindung erfolgt die sequentielle Abschaltung der Einspritzventile im Leerlaufbetrieb der Brennkraftmaschine nur dann, wenn die Kühlmitteltemperatur der Brennkraftmaschine größer als 80°C und/oder die Lufttemperatur im Ansaugluftsammler größer als 20°C ist. Damit wird erreicht, dass die Einzelzylinderabschaltung im Leerlaufbetrieb der Brennkraftmaschine nur bei betriebswarmer Brennkraftmaschine und/oder bei hinreichend warmer Außentemperatur erfolgt.According to an advantageous development of the invention, the sequential shutdown takes place the injection valves only when the internal combustion engine is idling, if the coolant temperature of the internal combustion engine is greater than 80 ° C and / or the air temperature in the intake air collector is greater than 20 ° C. So that is achieved that the single cylinder shutdown only when the engine is idling when the internal combustion engine is warm and / or when the outside temperature is sufficiently warm he follows.

Damit beim Einparken oder langsamen Dahinrollen des Kraftfahrzeuges durch Zuschalten der nichtbefeuerten Zylinder kein unangenehmer Drehmomentsprung am Ausgang der Brennkraftmaschine entsteht, wird gemäß einer weiteren Ausgestaltung der Erfindung die sequentielle Abschaltung der Einspritzventile erst bei einer Fahrzeuggeschwindigkeit größer als 5 km/h aufgehoben.So when parking or slowly rolling the motor vehicle by switching on the non-fired cylinder no unpleasant torque jump on Output of the internal combustion engine arises, according to a further embodiment the invention, the sequential shutdown of the injection valves only at one Vehicle speed greater than 5 km / h canceled.

Bei einer weiteren vorteilhaften Ausgestaltung der Erfindung wird die Temperatur des Abgaskatalysators durch Messen oder Überwachen der elektrischen Spannung der dem Abgaskatalysator zugeordneten Lambda-Sonde bestimmt.In a further advantageous embodiment of the invention, the temperature of the catalytic converter by measuring or monitoring the electrical voltage of the lambda probe assigned to the exhaust gas catalytic converter.

Im folgenden werden die beiden Alternativen der Erfindung jeweils anhand eines Ausführungsbeispieles erläutert.In the following, the two alternatives of the invention are each based on one Embodiment explained.

Es zeigen

Fig. 1
einen Logikplan, der die Schaltlogik einer Zylinderreihenumschaltung wiedergibt,
Fig. 2
einen Logikplan, der die Schaltlogik für die sequentielle Einspritzabschaltung wiedergibt, und
Fig. 3
ein Diagramm, das die Temperaturabhängigkeit der elektrischen Spannung der Lambda-Sonde eines Abgaskatalysators wiedergibt.
Show it
Fig. 1
a logic diagram which represents the switching logic of a cylinder bank changeover,
Fig. 2
a logic diagram representing the switching logic for the sequential injection shutdown, and
Fig. 3
a diagram that shows the temperature dependence of the electrical voltage of the lambda probe of an exhaust gas catalytic converter.

Der Logikplan von Fig. 1 gibt die Funktionsweise einer Vorrichtung zur Leerlaufsteuerung einer Kraftfahrzeug-Brennkraftmaschine mit zwei Zylinderreihen wieder, denen jeweils ein Abgaskatalysator mit Lambda-Sonde zugeordnet ist. Das ODER-Glied 1 erhält als Eingangsgrößen die Information, ob die Kühlmitteltemperatur TK größer als 80°C ist sowie die weitere Information, ob die Lufttemperatur TS im Ansaugluftsammler der Brennkraftmaschine größer als 20°C ist. Bei einer betriebswarmen Brennkraftmaschine und nicht gerade extrem winterlichen Umgebungstemperaturen gibt dann das ODER-Glied 1 ein Freigabesignal an ein erstes UND-Glied 2 ab. Diesem ersten UND-Glied 2 wird als weitere Eingangsgröße die Information zugeführt, ob die Geschwindigkeit VFZG des Kraftfahrzeuges kleiner als 5 km/h ist. Für den Fall, dass die Geschwindigkeit VFZG des Kraftfahrzeuges kleiner als 5 km/h ist, gibt das erste UND-Glied 2 an das zweite UND-Glied 3 ein logisches Signal "1" ab. Bei geschlossenem Leerlaufkontakt erhält das zweite UND-Glied 3 an seinem zweiten Eingang ein weiteres logisches Signal "1". Damit sind alle Voraussetzungen erfüllt, dass im Leerlaufbetrieb der Brennkraftmaschine die Einspritzventile einer der beiden Zylinderreihen abgeschaltet werden können. Dieses Ergebnis ist bis zu einer etwaigen Änderung im Speicherglied 4 abgespeichert. Das Speicherglied 4 gibt diese Information an die beiden nachfolgenden UND-Glieder 5 und 6 weiter. Während das UND-Glied 5 an seinem zweiten Eingang die Information über die Spannung UL1 der ersten Lambda-Sonde des ersten Abgaskatalysators erhält, erhält das UND-Glied 6 an seinem zweiten Eingang die Information über die Spannung UL2 der zweiten Lambda-Sonde des zweiten Abgaskatalysators. Für den Fall, dass die Spannung UL1 der ersten Lambda-Sonde des ersten Abgaskatalysators aufgrund der Abkühlung des ersten Abgaskatalysators unter einen Grenzwert UG fällt, dann bedeutet dies, dass die diesem ersten Abgaskatalysator zugeordnete Zylinderreihe wieder zugeschaltet werden muss und damit die bisher befeuerte Zylinderreihe, die dem zweiten Abgaskatalysator zugeordnet ist, abgeschaltet werden kann. Wenn jedoch nach einer bestimmten Abschaltzeit der nun abgeschalteten Zylinderreihe zugeordnete zweite Abgaskatalysator sich so stark abgekühlt hat, dass die Spannung UL2 der zweiten Lambda-Sonde des zweiten Abgaskatalysators einen Grenzwert UG unterschreitet, dann muss die dem zweiten Abgaskatalysator zugeordnete Zylinderreihe erneut befeuert werden, während die dem ersten Abgaskatalysator zugeordnete Zylinderreihe wieder abgeschaltet werden kann. Dieses wechselweise Abschalten der Einspritzventile einer der beiden Zylinderreihen im Leerlaufbetrieb der Brennkraftmaschine wird durch das schematisch dargestellte Brennkraftmaschinen-Steuergerät 7 vorgenommen.The logic diagram of FIG. 1 shows the functioning of a device for idle control of a motor vehicle internal combustion engine with two rows of cylinders, each of which is assigned an exhaust gas catalytic converter with a lambda probe. The OR gate 1 receives as input variables the information as to whether the coolant temperature T K is greater than 80 ° C and the further information as to whether the air temperature T S in the intake air collector of the internal combustion engine is greater than 20 ° C. In the case of an internal combustion engine that is at operating temperature and not exactly extremely wintry ambient temperatures, the OR gate 1 then emits an enable signal to a first AND gate 2. As a further input variable, this first AND gate 2 is supplied with the information as to whether the speed V FZG of the motor vehicle is less than 5 km / h. In the event that the speed V FZG of the motor vehicle is less than 5 km / h, the first AND gate 2 outputs a logic signal "1" to the second AND gate 3. When the open contact is closed, the second AND gate 3 receives a further logic signal "1" at its second input. This fulfills all of the requirements that the injection valves of one of the two cylinder rows can be switched off when the internal combustion engine is idling. This result is stored in the memory element 4 until any change. The memory element 4 passes this information on to the two subsequent AND elements 5 and 6. While the AND gate 5 receives the information about the voltage U L1 of the first lambda probe of the first exhaust gas catalytic converter at its second input, the AND gate 6 receives the information about the voltage U L2 of the second lambda probe of the second input second catalytic converter. In the event that the voltage U L1 of the first lambda probe of the first exhaust gas catalytic converter falls below a limit value U G due to the cooling of the first exhaust gas catalytic converter, this means that the cylinder row assigned to this first exhaust gas catalytic converter must be switched on again and thus the one previously fired Row of cylinders, which is assigned to the second catalytic converter, can be switched off. However, if after a certain switch-off time of the second exhaust catalytic converter assigned to the now deactivated cylinder bank has cooled down so much that the voltage U L2 of the second lambda probe of the second exhaust catalytic converter falls below a limit value U G , then the cylinder bank assigned to the second exhaust catalytic converter must be fired again. while the cylinder bank assigned to the first exhaust gas catalytic converter can be switched off again. This alternate switching off of the injection valves of one of the two cylinder rows when the internal combustion engine is idling is carried out by the schematically illustrated internal combustion engine control unit 7.

Der Logikplan von Fig. 2 gibt die Funktionsweise der Erfindung wieder. Er stimmt mit dem Logikplan von Fig. 1 in den ersten drei logischen Gliedern 1, 2 und 3 identisch überein. Auch beim Ausführungsbeispiel von Fig. 2 gibt das UND-Glied 3 ein logisches "1"-Signal an das UND-Glied 8 ab, wenn die Kühlmitteltemperatur TK grösser 80°C ist und/oder die Lufttemperatur TS im Luftsammler der Brennkraftmaschine größer 20° ist und zusätzlich die Fahrzeuggeschwindigkeit VFZG kleiner als 5 km/h ist und schließlich die Brennkraftmaschine im Leerlauf betrieben wird, d. h. der Leerlaufkontakt geschlossen ist. Dieses UND-Glied 8 erhält an seinem zweiten Eingang die Information, ob die elektrische Spannung UL der Lambda-Sonde des Abgaskatalysators größer oder kleiner als eine Grenzspannung UG ist. Solange die Spannung UL der Lambda-Sonde größer als die Grenzspannung UG ist, können im Leerlaufbetrieb der Brennkraftmaschine die Einspritzventile abhängig von der Brennkraftmaschinenzündfolge nach einem vorgegebenen Programm sequentiell abgeschaltet werden. Wenn jedoch die Spannung der Lambda-Sonde UL unter den Grenzwert UG fällt, dann bedeutet dies, dass der Abgaskatalysator schon bis auf seine für die ordnungsgemäße Konvertierung minimal erforderliche Grenztemperatur abgekühlt ist und folglich die sequentielle Einspritzventilabschaltung zumindest für eine vorgegebene Zeitspanne wieder aufgehoben werden muss. Erst wenn der Abgaskatalysator wieder eine ausreichend hohe Betriebstemperatur erreicht hat, d. h., wenn die elektrische Spannung UL der Lambda-Sonde wieder größer als die Grenzspannung UG ist, dann können die Einspritzventile erneut sequentiell abgeschaltet werden. Die sequentielle Abschaltung der Einspritzventile der Brennkraftmaschine erfolgt dann durch das Brennkraftmaschinen-Steuergerät 9.The logic diagram of Fig. 2 represents the operation of the invention. It is identical to the logic diagram of FIG. 1 in the first three logic elements 1, 2 and 3. Also in the embodiment of FIG. 2, the AND gate 3 sends a logical "1" signal to the AND gate 8 when the coolant temperature T K is greater than 80 ° C and / or the air temperature T S in the air collector of the internal combustion engine is greater Is 20 ° and in addition the vehicle speed V FZG is less than 5 km / h and finally the internal combustion engine is operated at idle, ie the idle contact is closed. At its second input, this AND gate 8 receives the information as to whether the electrical voltage U L of the lambda probe of the exhaust gas catalytic converter is greater or less than a limit voltage U G. As long as the voltage U L of the lambda probe is greater than the limit voltage U G , the injectors can be switched off sequentially depending on the engine ignition sequence according to a predetermined program when the internal combustion engine is idling. However, if the voltage of the lambda probe U L falls below the limit value U G , then this means that the exhaust gas catalytic converter has already cooled down to its minimum temperature required for the proper conversion, and consequently the sequential injection valve shutdown is canceled again at least for a predetermined period of time got to. Only when the exhaust gas catalytic converter has reached a sufficiently high operating temperature again, that is, when the electrical voltage U L of the lambda probe is again greater than the limit voltage U G , can the injection valves be switched off sequentially again. The sequential shutdown of the injection valves of the internal combustion engine is then carried out by the internal combustion engine control unit 9.

In dem Diagramm von Fig. 3 ist der Zusammenhang der elektrischen Spannung UL der Lambda-Sonde in Abhängigkeit von der Temperatur T des zugehörigen Abgaskatalysators dargestellt. Wie dem Diagramm von Fig. 3 zu entnehmen ist, nimmt die elektrische Spannung UL der Lambda-Sonde mit abnehmender Temperatur T des Abgaskatalysators ab. Die im Diagramm von Fig. 3 eingezeichnete Grenztemperatur TG stellt die Mindesttemperatur dar, die der Abgaskatalysator für eine ordnungsgemäße Funktion haben muss. Dieser Grenztemperatur TG entspricht im Diagramm eine Grenzspannung UG. Wenn nun der Abgaskatalysator der Brennkraftmaschine aufgrund einer zu lange andauernden sequentiellen Abschaltung der Einspritzventile unter die Betriebstemperatur TG abkühlt, dann sinkt die elektrische Spannung UL der zugehörigen Lambda-Sonde unter den Grenzwert UG. Aufgrund dieses Zusammenhangs kann die Spannung UL der Lambda-Sonde als Maß für die Temperatur des zugehörigen Abgaskatalysators verwendet werden, so dass ein separater Temperaturfühler eingespart werden kann.The diagram of FIG. 3 shows the relationship between the electrical voltage U L of the lambda probe as a function of the temperature T of the associated exhaust gas catalytic converter. As can be seen from the diagram in FIG. 3, the electrical voltage U L of the lambda probe decreases with decreasing temperature T of the exhaust gas catalytic converter. The limit temperature T G shown in the diagram of FIG. 3 represents the minimum temperature that the exhaust gas catalytic converter must have in order for it to function properly. In the diagram, this limit temperature T G corresponds to a limit voltage U G. If the exhaust gas catalytic converter of the internal combustion engine cools below the operating temperature T G due to an excessively long sequential shutdown of the injection valves, then the electrical voltage U L of the associated lambda probe drops below the limit value U G. Because of this relationship, the voltage U L of the lambda probe can be used as a measure of the temperature of the associated exhaust gas catalytic converter, so that a separate temperature sensor can be saved.

Durch die erfindungsgemäße Abschaltung einzelner Einspritzventile im Leerlaufbetrieb der Brennkraftmaschine wird unter Beibehaltung der Abgasqualität eine Verminderung des Kraftstoffverbrauchs sowie eine Verbesserung des thermischen Verhaltens der Brennkraftmaschine erreicht.By switching off individual injection valves according to the invention in idle mode the internal combustion engine becomes a reduction while maintaining the exhaust gas quality fuel consumption and an improvement in thermal behavior the internal combustion engine reached.

Claims (4)

  1. A device for controlling the idling of a motor-vehicle engine comprising an exhaust-gas catalytic converter and a lambda probe, wherein the device comprises means which during idling switch off injection valves and switch them on again at least for a preset time if the temperature (T) of the exhaust catalytic converter falls below a set limiting temperature (TG), characterised in that the means for switching off injection valves are constructed so that during idling of the engine the injection valves are switched off in sequence in accordance with a set program depending on the engine ignition sequence.
  2. A device according to claim 1, characterised in that when the engine is idling, the injection valves are sequentially switched off only when the engine coolant temperature (TK) is greater than 80°C and/or the air temperature (TS) in the intake air manifold is greater than 20°C.
  3. A device according to either of the preceding claims, characterised in that the sequential switching-off of the injection valves is terminated when the speed (FFZG) of the vehicle is greater than 5 km/h.
  4. A device according to any of the preceding claims, characterised in that the temperature (T) of the exhaust catalytic converter is determined by measuring or monitoring the voltage (UL) of the lambda probe associated with the corresponding exhaust catalytic converter.
EP94113276A 1993-10-11 1994-08-25 Apparatus for regulating the idling speed of the engine of a vehicle Expired - Lifetime EP0647775B1 (en)

Applications Claiming Priority (2)

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DE4334557A DE4334557A1 (en) 1993-10-11 1993-10-11 Device for idle control of a motor vehicle internal combustion engine
DE4334557 1993-10-11

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EP0647775A2 EP0647775A2 (en) 1995-04-12
EP0647775A3 EP0647775A3 (en) 1996-07-17
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Also Published As

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EP0647775A2 (en) 1995-04-12
EP0647775A3 (en) 1996-07-17
DE59410268D1 (en) 2003-05-15
US5586432A (en) 1996-12-24
DE4334557A1 (en) 1995-04-13

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