EP0280188A2 - Control device for a diesel engine - Google Patents

Control device for a diesel engine Download PDF

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Publication number
EP0280188A2
EP0280188A2 EP88102346A EP88102346A EP0280188A2 EP 0280188 A2 EP0280188 A2 EP 0280188A2 EP 88102346 A EP88102346 A EP 88102346A EP 88102346 A EP88102346 A EP 88102346A EP 0280188 A2 EP0280188 A2 EP 0280188A2
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EP
European Patent Office
Prior art keywords
internal combustion
combustion engine
lambda
line
fuel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88102346A
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German (de)
French (fr)
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EP0280188A3 (en
EP0280188B1 (en
Inventor
Richard Dipl.-Ing. Bauder
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Audi AG
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Audi AG
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Publication of EP0280188A3 publication Critical patent/EP0280188A3/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • 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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
    • 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
    • F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
    • F02D41/1475—Regulating the air fuel ratio at a value other than stoichiometry
    • 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
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D2041/224—Diagnosis of the fuel system
    • F02D2041/226—Fail safe control for fuel injection pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/32—Air-fuel ratio control in a diesel engine

Definitions

  • the invention relates to a control device for a diesel internal combustion engine with an air intake line, at least one fuel injection pump and an exhaust line, and with a device for stopping the internal combustion engine, for example a solenoid valve in the fuel line or a closing flap in the air intake line or the exhaust line.
  • the invention has for its object to provide a control device according to the preamble of claim 1, with which the injection of excess fuel is determined in a simple manner and in this case the internal combustion engine is stopped.
  • the invention is based on the knowledge that when an excess amount of fuel is injected, as can occur with a faulty injection system, the air ratio lambda in the exhaust gas is reduced almost suddenly.
  • a known lambda lean probe see, for example, DE-PS 33 05 706
  • this device is an electromagnetic shut-off valve in the fuel line, which is normally provided in every diesel fuel injection system and is used to suddenly cut off the fuel supply and switch off the engine when the ignition switch is switched off.
  • this case only a switch in series with the ignition starter switch needs to be provided in the circuit of the shut-off valve, which is excited by the comparison electronics and interrupts the circuit of the shut-off valve or connects it to ground.
  • a timer activated when the internal combustion engine is started can be provided, which prevents the internal combustion engine from being stopped for a certain period of time after the start, even if the actual lambda value falls below the permissible lambda target value, that is to say there is an excess fuel quantity.
  • 1 denotes a diesel internal combustion engine which has an air intake line 2, at least one fuel injection pump 3 and an exhaust line.
  • the injection pump 3 receives the fuel from a fuel pump 5 from a container 6 and conveys it through an injection line 7 in a time-controlled and quantity-controlled manner to the injection valves (not shown) of the diesel engine 1.
  • an electromagnetic shut-off valve 8 is arranged, which is controlled by Spring 17 is brought into the open position.
  • a starter switch 10 which is closed during operation of the internal combustion engine and in the closed state connects the winding of the shut-off valve 8 to a voltage source 11, whereby the shut-off valve 8 is brought into its closed position.
  • a lambda lean probe 12 is arranged in the exhaust gas line 4, which determines the oxygen content in the exhaust gas and feeds a corresponding signal through a line 13 to a comparison electronics 14, in which the probe signal is compared with a lambda target value. If the lambda setpoint falls below, for example, 1.5 (by a certain amount), the comparison electronics 14 outputs an output signal to the winding 15a of a relay 15 via a line 14a, which is connected in series with the starter switch 10 in the circuit 9 of the shutoff valve 8 lies, whereby its contact tongue 16 is brought from the normal position shown to the dashed position 16a, in which the circuit 9 is interrupted or connected to ground. Then the shut-off valve 8 is closed by the spring 17 and thus causes the internal combustion engine 1 to stop immediately.
  • the diesel internal combustion engine 1 is not stopped by shutting off the fuel supply, but rather by shutting off the air supply by means of a butterfly valve 21 arranged in the intake line 2 and actuated by an electromagnet 20, the electromagnet 20 of which by the comparative electronics 14 im Closing sense is excited when the described conditions are met.
  • an electromagnetically actuated shut-off valve 22 is arranged in the exhaust line 4 of the diesel internal combustion engine 1, which in turn is closed by the comparative electronics 14 when the corresponding requirements are met, so that the internal combustion engine 1 immediately is stopped.
  • the permissible lambda values are determined as a function of the rotational speed in the comparison electronics 14, in order to avoid stopping the internal combustion engine during starting and the injection of a fuel excess that takes place in the process.
  • an electromagnetic switch 25 is provided for this purpose in the control line 14a from the comparison electronics 14 to the relay winding 15a, the switching element 26 of which is normally held in the closed position by a spring 27, but is brought into the open position for the starting process is so that despite the presence of a fuel excess, the relay 15 is not energized and the shut-off valve 8 remains closed.
  • the switch 25 has a wick tion 28, in the power supply line 29 a timer 30 is arranged, which is activated when the starter switch 10 is closed and for a certain period after the start, for example 1 minute, maintains the power supply of the winding 28, so that the switching element 26 in its open position is brought. After this period, the line 29 is interrupted by the timer 30 and the switching element 26 is brought into the closed position by the spring 27. Now the comparison electronics 14 can be effective again and de-energize the winding 8a of the shut-off valve 8 via the relay 15 when the lambda value drops below the certain amount, so that the shut-off valve 8 is brought into its open position by the spring 17 and the fuel supply is increased Internal combustion engine 1 is interrupted.

Abstract

Eine Diesel-Brennkraftmaschine 1 weist eine Luftansaugleitung 2, eine Einspritzpumpe 3 und eine Abgasleitung 4 auf. In der Einspritzleitung 7 ist ein elektromagnetisches Abschaltventil 8 angeordnet, mit dem die Kraftstoffzufuhr beim Öffnen des Zündanlaßschalters 10 zwecks sofortigen Stillsetzens der Brennkraftmaschine 1 unterbrochen wird. In der Abgasleitung 4 ist eine Lambda-Magersonde 12 angeordnet, die ein dem Sauerstoffgehalt des Abgases entsprechendes Signal einer Vergleichselektronik 14 zuführt, in wlecher dieses Signal mit einem Lambda-Sollwert verglichen wird. Wenn beispielsweise durch einen Fehler im Einspritzsystem eine Kraftstoffübermenge eingespritzt wurde, unterschreitet der von der Lambdasonde 12 festgestellte Wert den Sollwert, worauf die Vergleichselektronik 14 einen Schalter 15 aktiviert, der in der Steuerleitung 9 des Abschaltventils 8 angeodnet ist. Dadurch wird die Stromzufuhr zu dem Abschaltventil 8 unterbrochen und die Kraftstoffzufuhr zur Brennkraftmaschine 1 abgesperrt. Ein unbeabsichtigtes Hochdrehen der Brennkraftmaschine durch fehlerhaftes Einspritzen einer Kraftstoffübermenge wird hierdurch verhindert.A diesel internal combustion engine 1 has an air intake line 2, an injection pump 3 and an exhaust line 4. An electromagnetic shut-off valve 8 is arranged in the injection line 7, with which the fuel supply is interrupted when the ignition starter switch 10 is opened for the purpose of immediately stopping the internal combustion engine 1. Arranged in the exhaust gas line 4 is a lambda lean probe 12, which feeds a signal, which corresponds to the oxygen content of the exhaust gas, to a comparison electronics unit 14, into which this signal is compared with a desired lambda value. If, for example, an excess fuel has been injected due to a fault in the injection system, the value determined by the lambda probe 12 falls below the target value, whereupon the comparison electronics 14 activates a switch 15, which is arranged in the control line 9 of the shutoff valve 8. As a result, the power supply to the shutoff valve 8 is interrupted and the fuel supply to the internal combustion engine 1 is shut off. This prevents the internal combustion engine from turning up unintentionally due to incorrect injection of excess fuel.

Description

Die Erfindung bezieht sich auf eine Steuereinrichtung für eine Diesel-Brennkraftmaschine mit einer Luftan­saugleitung, mindestens einer Kraftstoff-Einspritz­pumpe und einer Abgasleitung, und mit einer Vorrichtung zum Stillsetzen der Brennkraftmaschine, beispielsweise einem Magnetventil in der Kraftstoffleitung oder einer Abschlußklappe in der Luftansaugleitung oder der Ab­gasleitung.The invention relates to a control device for a diesel internal combustion engine with an air intake line, at least one fuel injection pump and an exhaust line, and with a device for stopping the internal combustion engine, for example a solenoid valve in the fuel line or a closing flap in the air intake line or the exhaust line.

Es gibt eine Vielzahl von Vorrichtungen, mit denen beim Erreichen einer zulässigen Höchstdrehzahl die Brennkraftmaschine beispielsweise durch Unterbrechen der Kraftstoffzufuhr stillgesetzt wird. Diese Vor­richtungen sind jedoch nicht in der Lage, die Brenn­kraftmaschine dann abzustellen, wenn unterhalb der Höchstdrehzahl ohne Einwirkung des Benutzers die Kraftstoffmenge plötzlich ansteigt, was bei mechani­schen Kraftstoff-Einspritzanlagen beispielsweise durch einen Defekt im Regler (Federbruch etc.) oder bei elektronischen Einspritzanlagen durch den Ausfall eines oder mehrerer elektronischer Bauelemente ver­ursacht werden kann. Ist eine derartige Brennkraft­maschine als Antriebsmaschine in ein Kraftfahrzeug eingebaut, so kann ein derartiger abrupter Drehzahl­anstieg und die dadurch bewirkte Beschleunigung des Fahrzeuges zu Fehlreaktionen führen.There are a large number of devices with which the internal combustion engine is stopped, for example by interrupting the fuel supply, when a permissible maximum speed is reached. However, these devices are not able to switch off the internal combustion engine if the amount of fuel suddenly increases below the maximum engine speed without user intervention, which is the case in mechanical fuel injection systems, for example due to a defect in the regulator (spring break etc.) or in electronic injection systems by Failure of one or more electronic components can be caused. If such an internal combustion engine is installed as a drive machine in a motor vehicle, such an abrupt increase in speed and the acceleration of the vehicle caused thereby can lead to incorrect reactions.

Der Erfindung liegt die Aufgabe zugrunde, eine Steuer­einrichtung gemäß dem Oberbegriff des Anspruchs 1 zu schaffen, mit der auf einfache Weise das Einspritzen einer Kraftstoff-Übermenge festgestellt und in diesem Fall die Brennkraftmaschine stillgesetzt wird.The invention has for its object to provide a control device according to the preamble of claim 1, with which the injection of excess fuel is determined in a simple manner and in this case the internal combustion engine is stopped.

Diese Aufgabe wird erfindungsgemäß durch die im Kenn­zeichen des Anspruchs 1 angegebenen Merkmale gelöst. Die Erfindung geht von der Erkenntnis aus, daß beim Einspritzen einer Übermenge an Kraftstoff, wie es bei fehlerhafter Einspritzanlage auftreten kann, die Luft­zahl Lambda im Abgas fast schlagartig verringert wird. Durch Verwendung einer bekannten Lambda-Magersonde (siehe z.B. DE-PS 33 05 706) kann auch eine über Lambda = 1 liegende Luftzahl im Abgas festgestellt werden. Wenn der in der Vergleichs­elektronik gespeicherte Lambda-Sollwert, der von Motor zu Motor verschieden sein und beispielsweise Lambda = 1,5 betragen kann, unterschritten wird, so ist dies ein Beweis dafür, daß eine Übermenge an Kraftstoff ein­gespritzt wurde, und die Vergleichselektronik aktiviert die Vorrichtung zum Stillsetzen der Brennkraftmaschine. Diese Vorrichtung ist im einfachsten und bevorzugten Fall ein elektromagnetisches Absperrventil in der Kraft­stoffleitung, das normalerweise bei jeder Diesel-Kraft­stoff-Einspritzanlage vorgesehen ist und dazu dient, beim Ausschalten des Zündanlaßschalters die Kraftstoff­zufuhr schlagartig zu unterbinden und den Motor abzu­schalten. In diesem Falle braucht in den Stromkreis des Abschaltventils lediglich ein in Reihe mit dem Zündanlaßschalter liegender Umschalter vorgesehen werden, der von der Vergleichselektronik erregt wird und den Stromkreis des Abschaltventils unterbricht oder auf Masse legt.This object is achieved by the features specified in the characterizing part of claim 1. The invention is based on the knowledge that when an excess amount of fuel is injected, as can occur with a faulty injection system, the air ratio lambda in the exhaust gas is reduced almost suddenly. By using a known lambda lean probe (see, for example, DE-PS 33 05 706), an air ratio in the exhaust gas that is above lambda = 1 can also be determined. If the lambda setpoint value stored in the comparison electronics, which differs from engine to engine and can be, for example, lambda = 1.5, is undershot, this is evidence that an excess amount of fuel has been injected, and the comparison electronics activates it Device for stopping the internal combustion engine. In the simplest and preferred case, this device is an electromagnetic shut-off valve in the fuel line, which is normally provided in every diesel fuel injection system and is used to suddenly cut off the fuel supply and switch off the engine when the ignition switch is switched off. In this case, only a switch in series with the ignition starter switch needs to be provided in the circuit of the shut-off valve, which is excited by the comparison electronics and interrupts the circuit of the shut-off valve or connects it to ground.

Da insbesondere bei Dieselbrennkraftmaschinen zum Antrieb von Kraftfahrzeugen zum Starten eine Mehrmenge an Kraftstoff eingespritzt wird, die zu einer ent­sprechenden Verringerung des Lambda-Wertes im Abgas führt, kann es zur Vermeidung eines unbeabsichtigten Stillsetzens der Brennkraftmaschine zweckmäßig sein, in der Vergleichselektronik eine Kurve mit drehzahl­abhängigen Lambda-Sollwerten zu speichern und dieser Elektronik ein drehzahlabhängiges Signal zuzuführen, um den für die momentane Drehzahl zulässigen Lambda-­Sollwert festzustellen, mit dem das Signal der Lambda-­Magersonde zu vergleichen ist. Alternativ kann ein beim Starten der Brennkraftmaschine aktiviertes Zeitglied vorgesehen sein, das für einen bestimmten Zeitraum nach dem Starten ein Stillsetzen der Brennkraftmaschine ver­hindert, auch wenn der Lambda-Istwert den zulässigen Lambda-Sollwert unterschreitet, also eine Kraftstoff-­Übermenge vorliegt.Since, in particular in diesel internal combustion engines for driving motor vehicles for starting, an additional amount of fuel is injected, which leads to a corresponding reduction in the lambda value in the exhaust gas, it may be expedient to avoid an unintentional shutdown of the internal combustion engine by using a curve with speed-dependent lambda in the comparative electronics -Saving setpoints and supplying this electronics with a speed-dependent signal, in order to determine the permissible lambda target value for the current speed with which the signal of the lambda lean probe is to be compared. Alternatively, a timer activated when the internal combustion engine is started can be provided, which prevents the internal combustion engine from being stopped for a certain period of time after the start, even if the actual lambda value falls below the permissible lambda target value, that is to say there is an excess fuel quantity.

Einige Ausführungsbeispiele der Erfindung werden im folgenden unter Bezugnahme auf die Zeichnungen be­schrieben. Es zeigt:

  • Fig. 1 ein Schaltbild einer erfindungsgemäßen Steuer­einrichtung,
  • Fig. 2 ein Diagramm der Luftzahl Lambda über der Drehzahl n, und
  • Fig. 3, 4 und 5 Abwandlungen des in Fig. 1 darge­stellten Ausführungsbeispiels.
Some embodiments of the invention are described below with reference to the drawings. It shows:
  • 1 is a circuit diagram of a control device according to the invention,
  • Fig. 2 is a diagram of the air ratio lambda over the speed n, and
  • 3, 4 and 5 modifications of the embodiment shown in Fig. 1.

In Fig. 1 ist mit 1 eine Diesel-Brennkraftmaschine be­zeichnet, die eine Luftansaugleitung 2, mindestens eine Kraftstoff-Einspritzpumpe 3 und eine Abgasleitung aufweist. Die Einspritzpumpe 3 erhält den Kraftstoff von einer Kraftstoffpumpe 5 aus einem Behälter 6 und fördert diesen durch eine Einspritzleitung 7 zeitlich und mengenmäßig geregelt zu den nicht dargestellten Einspritzventilen der Diesel-Brennkraftmaschine 1. In der Leitung 7 ist ein elektromagnetisches Abschaltventil 8 angeordnet, das durch eine Feder 17 in die Offenstellung gebracht wird. In der Stromzuleitung 9 zur Wicklung 8a des Abschaltventils 8 liegt ein Anlaßschalter 10, der im Betrieb der Brennkraftmaschine geschlossen ist und im geschlossenen Zustand die Wicklung des Abschalt­ventils 8 mit einer Spannungsquelle 11 verbindet, wo­durch das Abschaltventil 8 in seine geschlossene Stellung gebracht wird.In FIG. 1, 1 denotes a diesel internal combustion engine which has an air intake line 2, at least one fuel injection pump 3 and an exhaust line. The injection pump 3 receives the fuel from a fuel pump 5 from a container 6 and conveys it through an injection line 7 in a time-controlled and quantity-controlled manner to the injection valves (not shown) of the diesel engine 1. In line 7, an electromagnetic shut-off valve 8 is arranged, which is controlled by Spring 17 is brought into the open position. In the power supply line 9 to the winding 8a of the shut-off valve 8 there is a starter switch 10 which is closed during operation of the internal combustion engine and in the closed state connects the winding of the shut-off valve 8 to a voltage source 11, whereby the shut-off valve 8 is brought into its closed position.

In der Abgasleitung 4 ist eine Lambda-Magersonde 12 angeordnet, welche den Sauerstoffgehalt im Abgas fest­stellt und ein entsprechendes Signal durch eine Lei­tung 13 einer Vergleichselektronik 14 zuführt, in welcher das Sonden-Signal mit einem Lambda-Sollwert verglichen wird. Wird der Lambda-Sollwert von beispiels­weise 1,5 (um einen bestimmten Betrag) unterschritten, so gibt die Vergleichselektronik 14 über eine Leitung 14a ein Ausgangssignal an die Wicklung 15a eines Relais 15, das im Stromkreis 9 des Abschaltventils 8 in Reihe mit dem Anlaßschalter 10 liegt, wodurch dessen Kontaktzunge 16 aus der dargestellten Normalstellung in die ge­strichelte Position 16a gebracht wird, in welcher der Stromkreis 9 unterbrochen bzw. mit Masse verbunden ist. Dann wird das Abschaltventil 8 durch die Feder 17 geschlossen und somit ein sofortiges Stillsetzen der Brennkraftmaschine 1 bewirkt.A lambda lean probe 12 is arranged in the exhaust gas line 4, which determines the oxygen content in the exhaust gas and feeds a corresponding signal through a line 13 to a comparison electronics 14, in which the probe signal is compared with a lambda target value. If the lambda setpoint falls below, for example, 1.5 (by a certain amount), the comparison electronics 14 outputs an output signal to the winding 15a of a relay 15 via a line 14a, which is connected in series with the starter switch 10 in the circuit 9 of the shutoff valve 8 lies, whereby its contact tongue 16 is brought from the normal position shown to the dashed position 16a, in which the circuit 9 is interrupted or connected to ground. Then the shut-off valve 8 is closed by the spring 17 and thus causes the internal combustion engine 1 to stop immediately.

Da der Diesel-Brennkraftmaschine während des Startens normalerweise eine Kraftstoff-Übermenge eingespritzt wird, was zu einem Absenken der Luftzahl im Abgas führen kann, und da der zulässige Lambda-Wert über der Drehzahl schwanken kann, ist es zweckmäßig, in der Vergleichselektronik 14 eine Kurve mit drehzahl­abhängigen Lambda-Sollwerten zu speichern. Eine der­artige Kurve ist in Fig. 2 dargestellt. Durch Zuführen eines drehzahlabhängigen Signals zu der Vergleichs­elektronikl 14 kann diese nun für jede Drehzahl den entsprechenden Lambda-Sollwert ermitteln und mit dem Signal der Lambda-Magersonde 12 vergleichen. Auf diese Weise wird eine Fehl-Abschaltung der Brennkraft­maschine 1 vermieden.Since the diesel internal combustion engine is normally injected with an excessive fuel quantity during starting, which can lead to a lowering of the air ratio in the exhaust gas, and since the permissible lambda value can fluctuate over the rotational speed, it is expedient to have a curve in the comparison electronics 14 save with speed-dependent lambda setpoints. Such a curve is shown in FIG. 2. By supplying a speed-dependent signal to the comparison electronics 14, the latter can now determine the corresponding lambda target value for each speed and compare it with the signal of the lambda lean probe 12. To this A faulty shutdown of the internal combustion engine 1 is avoided.

Bei der Abwandlung gemäß Fig. 3 erfolgt das Still­setzen der Diesel-Brennkraftmaschine 1 nicht durch Absperren der Kraftstoffzufuhr, sondern durch Absperren der Luftzufuhr mittels einer in der Ansaugleitung 2 angeordneten, durch einen Elektromagenten 20 betätig­ten Absperrklappe 21, deren Elektromagnet 20 durch die Vergleichselektronik 14 im Schließsinn erregt wird, wenn die geschilderten Voraussetzungen vorliegen.In the modification according to FIG. 3, the diesel internal combustion engine 1 is not stopped by shutting off the fuel supply, but rather by shutting off the air supply by means of a butterfly valve 21 arranged in the intake line 2 and actuated by an electromagnet 20, the electromagnet 20 of which by the comparative electronics 14 im Closing sense is excited when the described conditions are met.

Bei der Abwandlung gemäß Fig. 4 ist abweichend von Fig. 3 in der Abgasleitung 4 der Diesel-Brennkraft­maschine 1 eine elektromagnetisch betätigbare Absperr­klappe 22 angeordnet, die wiederum durch die Ver­gleichselektronik 14 geschlossen wird, wenn die ent­sprechenden Voraussetzungen vorliegen, so daß die Brennkraftmaschine 1 augenblicklich stillgesetzt wird.4, an electromagnetically actuated shut-off valve 22 is arranged in the exhaust line 4 of the diesel internal combustion engine 1, which in turn is closed by the comparative electronics 14 when the corresponding requirements are met, so that the internal combustion engine 1 immediately is stopped.

Bei der Ausführung gemäß Fig. 1 erfolgt in der Ver­gleichselektronik 14 eine Feststellung der zulässigen Lambda-Werte in Abhängigkeit von der Drehzahl, um ein Stillsetzen der Brennkraftmaschine während des Startens und der dabei erfolgenden Einspritzung einer Kraftstoff-­Übermenge zu vermeiden. Bei der Abwandlung gemäß Fig. 5 ist zu diesem Zweck in der Steuerleitung 14a von der Vergleichselektronik 14 zur Relaiswicklung 15a ein elektromagnetischer Schalter 25 vorgesehen, dessen Schaltelement 26 normalerweise durch eine Feder 27 in der Schließstellung gehalten wird, jedoch für den Startvorgang in die Offenstellung gebracht wird, so daß trotz des Vorliegens einer Kraftstoff-Übermenge das Relais 15 nicht erregt wird und das Abschaltventil 8 geschlossen bleibt. Der Schalter 25 weist eine Wick­ lung 28 auf, in deren Stromzuleitung 29 ein Zeitglied 30 angeordnet ist, das beim Schließen des Anlaßschalters 10 aktiviert wird und für einen bestimmten Zeitraum nach dem Start, beispielsweise 1 Minute, die Stromversorgung der Wicklung 28 aufrecht erhält, so daß das Schaltelement 26 in seine offene Stellung gebracht wird. Nach diesem Zeit­raum wird die Leitung 29 durch das Zeitglied 30 unter­brochen und das Schaltelement 26 durch die Feder 27 in die geschlossene Stellung gebracht. Nun kann die Ver­gleichselektronik 14 wieder wirksam werden und die Wicklung 8a des Abschaltventils 8 über das Relais 15 stromlos machen, wenn der Lambda-Wert unter den be­stimmten Betrag sinkt, so daß das Abschaltventil 8 durch die Feder 17 in ihre Offenstellung gebracht und die Kraftstoffzufuhr zur Brennkraftmaschine 1 unterbrochen wird.In the embodiment according to FIG. 1, the permissible lambda values are determined as a function of the rotational speed in the comparison electronics 14, in order to avoid stopping the internal combustion engine during starting and the injection of a fuel excess that takes place in the process. 5, an electromagnetic switch 25 is provided for this purpose in the control line 14a from the comparison electronics 14 to the relay winding 15a, the switching element 26 of which is normally held in the closed position by a spring 27, but is brought into the open position for the starting process is so that despite the presence of a fuel excess, the relay 15 is not energized and the shut-off valve 8 remains closed. The switch 25 has a wick tion 28, in the power supply line 29 a timer 30 is arranged, which is activated when the starter switch 10 is closed and for a certain period after the start, for example 1 minute, maintains the power supply of the winding 28, so that the switching element 26 in its open position is brought. After this period, the line 29 is interrupted by the timer 30 and the switching element 26 is brought into the closed position by the spring 27. Now the comparison electronics 14 can be effective again and de-energize the winding 8a of the shut-off valve 8 via the relay 15 when the lambda value drops below the certain amount, so that the shut-off valve 8 is brought into its open position by the spring 17 and the fuel supply is increased Internal combustion engine 1 is interrupted.

Claims (3)

1. Steuereinrichtung für eine Diesel-Brennkraftmaschine mit einer Luftansaugleitung, mindestens einer Kraft­stoff-Einspritzpumpe und einer Abgasleitung, und mit einer Vorrichtung zum Stillsetzen der Brennkraft­maschine,
gekennzeichnet durch
a) eine Lambda-Magersonde (12) in der Abgas­leitung (4) und
b) eine Vergleichselektronik (14), die den von der Lambda-Magersonde festgestellten Sauerstoffgehalt im Abgas mit einem Sollwert vergleicht und bei einem unter diesem Sollwert liegenden Sauerstoff­gehalt die Vorrichtung (8, 21, 22) zum Stillsetzen der Brennkraftmaschine(1) aktiviert.1. Control device for a diesel internal combustion engine with an air intake line, at least one fuel injection pump and an exhaust gas line, and with a device for stopping the internal combustion engine,
marked by
a) a lambda lean sensor (12) in the exhaust pipe (4) and
b) comparative electronics (14) which compare the oxygen content in the exhaust gas determined by the lambda lean probe with a target value and, when the oxygen content is below this target value, activates the device (8, 21, 22) for stopping the internal combustion engine (1). 2. Steuereinrichtung nach Anspruch 1, dadurch gekenn­zeichnet, daß die Vergleichselektronik (14) eine Kurve mit drehzahlabhängigen Lambda-Sollwerten enthält und ein drehzahlabhängiges Signal zur Ermittlung des Vergleichs-Sollwertes erhält.2. Control device according to claim 1, characterized in that the comparison electronics (14) contains a curve with speed-dependent lambda setpoints and receives a speed-dependent signal for determining the comparison setpoint. 3. Steuereinrichtung nach Anspruch 1, dadurch gekenn­zeichnet, daß ein Zeitglied (30) vorgesehen ist, das durch Schließen des Anlaßschalters (10) der Brenn­kraftmaschine aktiviert wird und die Vorrichtung (8) zum Stillsetzen der Brennkraftmaschine für einen be­stimmten Zeitraum nach Schließen des Anlaßschalters (10) außer Betrieb setzt.3. Control device according to claim 1, characterized in that a timing element (30) is provided, which is activated by closing the starter switch (10) of the internal combustion engine and the device (8) for stopping the internal combustion engine for a certain period after closing the starter switch ( 10) decommissioning.
EP88102346A 1987-02-25 1988-02-18 Control device for a diesel engine Expired - Lifetime EP0280188B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873705972 DE3705972A1 (en) 1987-02-25 1987-02-25 CONTROL DEVICE FOR A DIESEL INTERNAL COMBUSTION ENGINE
DE3705972 1987-02-25

Publications (3)

Publication Number Publication Date
EP0280188A2 true EP0280188A2 (en) 1988-08-31
EP0280188A3 EP0280188A3 (en) 1988-12-21
EP0280188B1 EP0280188B1 (en) 1991-11-06

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ID=6321698

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EP88102346A Expired - Lifetime EP0280188B1 (en) 1987-02-25 1988-02-18 Control device for a diesel engine

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Country Link
US (1) US4903670A (en)
EP (1) EP0280188B1 (en)
JP (1) JP2617971B2 (en)
DE (2) DE3705972A1 (en)

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Also Published As

Publication number Publication date
JPS63227939A (en) 1988-09-22
JP2617971B2 (en) 1997-06-11
DE3865983D1 (en) 1991-12-12
US4903670A (en) 1990-02-27
EP0280188A3 (en) 1988-12-21
DE3705972A1 (en) 1988-09-08
EP0280188B1 (en) 1991-11-06

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