EP0435965B1 - Control device for stopping an internal combustion engine - Google Patents

Control device for stopping an internal combustion engine Download PDF

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Publication number
EP0435965B1
EP0435965B1 EP90903789A EP90903789A EP0435965B1 EP 0435965 B1 EP0435965 B1 EP 0435965B1 EP 90903789 A EP90903789 A EP 90903789A EP 90903789 A EP90903789 A EP 90903789A EP 0435965 B1 EP0435965 B1 EP 0435965B1
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EP
European Patent Office
Prior art keywords
internal combustion
solenoid valve
control device
valve
combustion engine
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Expired - Lifetime
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EP90903789A
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German (de)
French (fr)
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EP0435965A1 (en
Inventor
Hermann Grieshaber
Wilhelm Polach
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
    • F02D17/04—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling rendering engines inoperative or idling, e.g. caused by abnormal conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0205—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
    • F02M63/022—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine by acting on fuel control mechanism
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S123/00—Internal-combustion engines
    • Y10S123/11—Antidieseling

Definitions

  • the invention is based on a control device according to the preamble of claim 1.
  • Control devices for in-line injection pumps are already known in which, in the case of mechanically controlled in-line injection pumps with a key stop, the control rod is brought into a stop position by means of an actuating piston controlled by auxiliary energy.
  • the fuel pressure has generally been proposed as auxiliary energy, the positive or negative pressure of the air as a pneumatic solution, or the current as an electrical solution.
  • these auxiliary energies are not fully reliable.
  • the fuel pressure is used as auxiliary energy, diesel fuel saturation with filter clogging can occur at low temperatures. As with fuel leaks, the pressure build-up is disturbed or can no longer be produced.
  • DE-A 15 76 658 it is known in a generic control device to use the engine lubricating oil pressure as auxiliary energy for the shut-off device.
  • An end face of the control rod for ordering the in-line injection pump is acted upon directly by the pressurized engine lubricating oil and thus a displacement of the control rod is triggered in such a way that it reaches its stop position and the fuel metering is switched off.
  • a solenoid valve connected to the alternator in the form of a 3/2-way valve is used, to which a relief line is connected in addition to an inlet and outlet pressure line.
  • this arrangement can lead to the fact that when the engine is switched off, the holding current for the electromagnet of the solenoid valve has dropped so far at a very low engine speed — the internal combustion engine, at which the alternator no longer outputs a voltage sufficient for the operation of the solenoid valve, that the solenoid valve closes again and the control path is at least partially released again, the motor turns itself on catches, starts up again and does not completely switch off again.
  • This state corresponds to a control behavior called "sawing" and is a periodic oscillation between two unwanted operating states, which prevents the safe ordering of the internal combustion engine.
  • the control device with the characterizing features of claim 1 has the advantage that it avoids the above disadvantages.
  • using the pressure of the engine lubricating oil as auxiliary energy it has a simple, normally open 2/2-way valve as a solenoid valve, whereby the pressure supply to the pressure chamber of the actuating piston is also switched and the relief of the engine lubricating oil that moves the control rod when it is switched off
  • Fuel injection pump that has come to a standstill is uncontrolled and takes place automatically by the spring returning the control piston and the outflow throttle surrounding the pressure chamber of the control piston. After the fuel injection pump has been switched off, the control rod automatically reaches the position required for the start release.
  • control rod remains in the stop position until the internal combustion engine is brought to a standstill, regardless of how quickly and when the oil pressure in the internal combustion engine has dropped.
  • an outflow channel which is preferably embodied directly in the control piston, is used to produce the pressure compensation between the pressure chamber and the spring chamber, whereby the control rod automatically moves from the stop position to the start position.
  • check valve embodied in the characterizing part of claim 3, designed as a flap valve, it is possible to achieve an effective switching behavior particularly sensitively, even with only small actuating forces, and to avoid hysteresis processes in the control behavior of the control device.
  • control behavior of the control device can be additionally influenced by the timing element embodied via the backflow throttle.
  • the control device for stopping a diesel internal combustion engine consists of an electrical control circuit 11 and a hydraulic control circuit 12 which interacts with it and forms a starting and stopping device.
  • a valve assembly 21 of the solenoid valve 19 is opened when the electromagnet 18 is de-energized and is part of the hydraulic control circuit 12, which has an oil pan 22 that receives the engine lubricating oil, from which an oil pump 23 operated simultaneously with the internal combustion engine supplies the engine lubricating oil to the lubrication points of the internal combustion engine and into a pressure line 24 promotes in which the valve assembly 21 is inserted and which leads to the pressure port 26 of an actuating cylinder 27.
  • An actuating piston 28 is mounted in a sealingly displaceable manner in the actuating cylinder 27, the pressure-side end face 29 facing the pressure connection 26 delimiting a pressure chamber 31, in which a stop 32 and a check valve 33 are contained, which restrict the movement of the actuating piston 28 in the direction of narrowing the volume of the pressure chamber 31.
  • the stop 32 is adjustable as a function of operating parameters, for example as a function of the temperature of the engine lubricating oil.
  • the check valve 33 is designed as a flap valve and attached to a bottom 34 of the actuating cylinder 27 which closes the pressure chamber 31 and, depending on the type, bulges away from the bottom 34 due to a resilient internal stress or under flow pressure.
  • the check valve 33 is easy to apply to the base 30 due to its low internal stress due to flow forces from the engine lubricating oil emerging from the pressure chamber 31 to the pressure line 24 or is already applied to the base 34 due to internal stress.
  • the pressure cross-section 26 is covered in its passage cross-section except for a small residual cross-section, this being formed by a backflow throttle 36 located in the check valve 33.
  • the actuating piston 28 is loaded on an end face 37 on the spring chamber side facing away from the pressure chamber 31 by the force of a prestressed return spring 38, which is supported on an inner wall 41 of the actuating cylinder 27 that closes off a spring chamber 39.
  • the pressure-side end face 29 and the spring-side end face 37 of the actuating piston 28 are connected to an outflow throttle 42 located therein by an outflow channel 46 formed as a longitudinal bore in the actuating piston 28.
  • a pin-shaped transmission member 43 protrudes from its end face 37 on the spring chamber side which penetrates the inner wall 41 of the actuating cylinder 27 and can be brought into engagement with the control rod 44 serving as the delivery rate adjustment member.
  • control rod 44 it can also be actuated in the case of cramped mounting conditions by means of a dash-dotted transmission element 143 protruding at right angles from the actuating piston 28, which in this case engages in a longitudinal groove 48 of the control rod 44 or in a suitable component of the regulator , moves it to the stop position "0", but does not hinder its control movement in normal operation.
  • a dash-dotted transmission element 143 protruding at right angles from the actuating piston 28, which in this case engages in a longitudinal groove 48 of the control rod 44 or in a suitable component of the regulator , moves it to the stop position "0", but does not hinder its control movement in normal operation.
  • the arrangement described above has the following functional and operational sequence. Starting from an operated diesel internal combustion engine, when it is switched off, the operating contact 14 of the main switch is brought into its open position, the electromagnet 18 of the solenoid valve 19 being de-energized and the valve assembly 21 coming into its rest position, which releases the pressure line 24.
  • the oil pump 23 coupled to the internal combustion engine is able to draw engine lubricating oil from the oil pan 22 and to deliver it to the pressure port 26 via the pressure line 24.
  • the check valve 33 which is closed when the solenoid valve 19 is blocked, is now detected by the pressure of the engine lubricating oil and opens the passage at the bottom 34, so that the engine lubricating oil, which previously could only flow through the return flow throttle 36, now reaches the pressure chamber 31 in the main flow, as a result of which the actuating piston 28 is quickly moved against the force of the return spring 38 and the transmission member 43 connected to it, the control rod 44 to a left shift, z. B. from its starting position "S” or, as drawn, from its full load position "V” into its stop position "0", which stops the fuel delivery, in which the control path 46 of the control rod 44 is eliminated, ie becomes zero.
  • the fuel supply to the internal combustion engine is thus interrupted and the motor vehicle operated by it can come to a standstill.
  • the control rod 44 which has been temporarily brought into the stop position for ordering the internal combustion engine, has thus automatically returned to an operating position which enables the internal combustion engine to start.
  • the function of the return valve 33 with the return flow throttle 36 can alternatively also be taken over by a check valve 33 without a return flow throttle 36, since the return flow of the engine lubricating oil with the control piston 28 shifting to the right with the check valve 33 now in the blocked state is already possible solely via the discharge throttle 42, in order to provide the control rod 44 with the necessary control path 47 for readiness to start again.

Abstract

Mechanical devices are frequently used to shut off fuel injection pumps for diesel internal combustion engines. The control device according to the invention shuts off the pump by means of the steering wheel key when electrically triggered. In addition, it can be used as a redundant emergency shut-off device in electronically controlled fuel injection pumps. To this end, the control device comprises a two-way solenoid valve (19), whose switching condition is governed by the position of the steering wheel key and by a switch contact (16) of a diesel engine control device (17). The solenoid valve (19) controls the supply of engine lubricating oil to a control piston (28) which can move a control rod of the fuel injection pump which controls the fuel supply to the internal combustion engine in its working range. The displacement of the control piston (28) is influenced by a choke (42) and a nonreturn valve (33) in such a manner that after a stop position 'O', the control rod (44) automatically moves to a start position 'S' necessary for restarting the internal combustion engine. This control device is particularly suitable for fuel injection pumps for diesel internal combustion engines.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Steuereinrichtung nach der Gattung des Anspruchs 1. Es sind schon Steuereinrichtungen für Reiheneinspritzpumpen bekannt, bei denen bei mechanisch geregelten Reiheneinspritzpumpen mit Schlüsselabstellung die Regelstange über einen mit Hilfsenergie gesteuerten Stellkolben in eine Stoppstellung gebracht wird. Dabei wurden als Hilfsenergie im allgemeinen als hydraulische Lösung der Kraftstoffdruck, als pneumatische Lösung der Über- oder Unterdruck der Luft oder als elektrische Lösung der Strom vorgeschlagen. Diese Hilfsenergien sind jedoch nicht uneingeschränkt zuverlässig.The invention is based on a control device according to the preamble of claim 1. Control devices for in-line injection pumps are already known in which, in the case of mechanically controlled in-line injection pumps with a key stop, the control rod is brought into a stop position by means of an actuating piston controlled by auxiliary energy. In this case, the fuel pressure has generally been proposed as auxiliary energy, the positive or negative pressure of the air as a pneumatic solution, or the current as an electrical solution. However, these auxiliary energies are not fully reliable.

Wird der Kraftstoffdruck als Hilfsenergie eingesetzt, so kann bei tiefen Temperaturen eine Dieselkraftstoffversulzung mit einer Filterverstopfung auftreten. Wie auch bei Kraftstoffleckagen ist hier der Druckaufbau gestört oder auch gar nicht mehr herstellbar.If the fuel pressure is used as auxiliary energy, diesel fuel saturation with filter clogging can occur at low temperatures. As with fuel leaks, the pressure build-up is disturbed or can no longer be produced.

Gleiches gilt für Druckluft als Hilfsenergie, wenn über Druckluftleckagen, beispielsweise durch Druckabfall im Druckluftbehälter bei langer Standzeit die Hilfsenergie nicht mehr im notwendigen Maß zur Verfügung steht.The same applies to compressed air as auxiliary energy if the auxiliary energy is no longer available to the necessary extent due to compressed air leakage, for example due to a drop in pressure in the compressed air tank when it is not used for a long time.

Ein völliger Ausfall der Hilfsenergie, oft noch ohne Vorankündigung, kann bei der Versorgung mit Strom auftreten, wenn im Bordnetz aus diversen Gründen ein Stromausfall auftritt.A complete failure of the auxiliary power, often without prior notice, can occur with the power supply if there is a power failure in the vehicle electrical system for various reasons.

Nach der DE-A 15 76 658 ist es bei einer gattungsgemäßen Steuereinnrichtung bekannt, als Hilfsenergie für die Abstelleinrichtung den Motorschmieröldruck heranzuziehen. Dabei wird eine Stirnseite der Regelstange zum bestellen der Reiheneinspritzpumpe direkt mit dem unter Druck stehenden Motorschmieröl beaufschlagt und damit eine Verschiebung der Regelstange derart ausgelöst, daß diese in ihre Stoppstellung gelangt und die Kraftstoffzumessung ausgeschaltet ist. Zur Steuerung dieses Vorgangs ist ein an die Lichtmaschine angeschlossenes Magnetventil in Form eines 3/2-Wegeventil benützt, an das neben einer zu- und abführenden Druckleitung noch eine Entlastungsleitung angeschlossen ist.According to DE-A 15 76 658 it is known in a generic control device to use the engine lubricating oil pressure as auxiliary energy for the shut-off device. An end face of the control rod for ordering the in-line injection pump is acted upon directly by the pressurized engine lubricating oil and thus a displacement of the control rod is triggered in such a way that it reaches its stop position and the fuel metering is switched off. To control this process, a solenoid valve connected to the alternator in the form of a 3/2-way valve is used, to which a relief line is connected in addition to an inlet and outlet pressure line.

Bei dieser Anordnung ist jedoch in nachteiliger Weise der zur Verschiebung der Regelstange in die Stoppstellung vom Schmieröl beaufschlagte Druckraum nur über das baulich aufwendige 3/2-Ventil für den Wiederstart entlastbar. Da das 3/2-Ventil erst durch seine Betriebsstellung ermöglicht, daß die Regelstange in die Stoppstellung ausrücken kann, ergibt sich bei Stromausfall, wie er beispielsweise durch den Bruch eines Kabels auftreten kann, daß gar kein bestellen mehr möglich ist.In this arrangement, however, the pressure chamber acted upon by the lubricating oil to move the control rod into the stop position can only be relieved via the structurally complex 3/2 valve for the restart. Since the 3/2 valve only enables the control rod to disengage into the stop position due to its operating position, the result in the event of a power failure, such as can occur due to the breakage of a cable, that ordering is no longer possible.

Des weiteren kann bei dieser Anordnung der Umstand eintreten, daß beim Motorabstellen der Haltestrom für den Elektromagneten des Magnetventils bei sehr niedriger Motordrehzahl-der Brennkraftmaschine, bei der die Lichtmaschine nicht mehr eine für den Betrieb des Magnetventils ausreichende Spannung abgibt, schon so weit abgefallen ist, daß das Magnetventil wieder schließt und der Regelweg mindestens teilweise wieder freigegeben wird, der Motor sich wieder fängt, erneut hochläuft und wieder nicht vollständig abstellt. Dieser Zustand entspricht einem als "sägen" bezeichneten Regelverhalten und ist ein periodisches Pendeln zwischen zwei ungewollten Betriebszuständen, wodurch das sichere bestellen der Brennkraftmaschine verhindert wird.Furthermore, this arrangement can lead to the fact that when the engine is switched off, the holding current for the electromagnet of the solenoid valve has dropped so far at a very low engine speed — the internal combustion engine, at which the alternator no longer outputs a voltage sufficient for the operation of the solenoid valve, that the solenoid valve closes again and the control path is at least partially released again, the motor turns itself on catches, starts up again and does not completely switch off again. This state corresponds to a control behavior called "sawing" and is a periodic oscillation between two unwanted operating states, which prevents the safe ordering of the internal combustion engine.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Steuereinrichtung mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß sie die vorstehenden Nachteile vermeidet. Dazu weist diese, den Druck des Motorschmieröls als Hilfsenergie benutzend, als Magnetventil ein einfaches, stromlos offenes 2/2-Wegeventil auf, wobei noch die Druckzuführung zum Druckraum des Stellkolbens geschaltet wird und die Entlastung des im Abstellfall die Regelstange in die Stoppstellung verschiebenden Motorschmieröls bei zum Stillstand gekommener Kraftstoffeinspritzpumpe ungesteuert und selbständig durch die den Stellkolben rückführende Feder und die den Druckraum des Stellkolbens umgebende Abströmdrossel erfolgt. Damit erreicht die Regelstange nach dem Abstellen der Kraftstoffeinspritzpumpe selbständig die für die Startfreigabe erforderliche Position.The control device according to the invention with the characterizing features of claim 1 has the advantage that it avoids the above disadvantages. For this purpose, using the pressure of the engine lubricating oil as auxiliary energy, it has a simple, normally open 2/2-way valve as a solenoid valve, whereby the pressure supply to the pressure chamber of the actuating piston is also switched and the relief of the engine lubricating oil that moves the control rod when it is switched off Fuel injection pump that has come to a standstill is uncontrolled and takes place automatically by the spring returning the control piston and the outflow throttle surrounding the pressure chamber of the control piston. After the fuel injection pump has been switched off, the control rod automatically reaches the position required for the start release.

Die zum Stand der Technik als nachteilig mit "sägen" Abschriebene unerwünschte Betriebsweise des periodischen unvollendeten Abestellvorgangs wird bei der erfindungsgemäßen Anordnung sicher durch das Rückschlagventil verhindert, das dem Druckraum von der Druckquelle aus strömungsmäßig vorgeschaltet ist und im Abstellfall bei zu schnell abfallendem Schmieröldruck ein zu schnelles Abfließen des Motorschmieröls aus dem Druckraum und somit ein Wiederhochlaufen der Brennkraftmaschine verhindert.The undesirable mode of operation of the periodic unfinished shutdown process, which is disadvantageous with "sawing" and has been depreciated with the prior art, is reliably prevented in the arrangement according to the invention by the check valve, which is upstream of the pressure chamber from the pressure source and in the event of a shutdown if the lubricating oil pressure drops too quickly Drain the engine lubricating oil from the pressure chamber and thus prevent the internal combustion engine from starting up again.

Durch diese Maßnahme verbleibt die Regelstange so lange in der Stoppstellung, bis die Brennkraftmaschine sicher zum Stillstand gebracht ist, und zwar unabhängig davon, wie schnell und wann der Öldruck in der Brennkraftmaschine abgefallen ist.As a result of this measure, the control rod remains in the stop position until the internal combustion engine is brought to a standstill, regardless of how quickly and when the oil pressure in the internal combustion engine has dropped.

Weitere vorteilhafte Ausgestaltungen sind den nachfolgenden Ansprüchen entnehmbar.Further advantageous configurations can be found in the following claims.

So wird durch die kennzeichnenden Merkmale des Anspruchs 2 ein vorzugsweise im Stellkolben unmittelbar verkörperter Abströmkanal verwendet, um den Druckausgleich zwischen dem Druckraum und dem Federraum herzustellen, wodurch die Regelstange selbständig von der Stoppstellung in die Startstellung gelangt.Thus, by means of the characterizing features of claim 2, an outflow channel, which is preferably embodied directly in the control piston, is used to produce the pressure compensation between the pressure chamber and the spring chamber, whereby the control rod automatically moves from the stop position to the start position.

Mit dem im Kennzeichenteil des Anspruchs 3 enthaltenen, als Klappenventil ausgebildeten Rückschlagventil ist es möglich, besonders feinfühlig auch bei nur geringen Stellkräften ein wirkungsvolles Schaltverhalten zu erzielen und Hysteresevorgänge im Regelverhalten der Steuereinrichtung zu vermeiden.With the check valve embodied in the characterizing part of claim 3, designed as a flap valve, it is possible to achieve an effective switching behavior particularly sensitively, even with only small actuating forces, and to avoid hysteresis processes in the control behavior of the control device.

Durch die kennzeichnenden Merkmale des Anspruchs 4 kann das Regelverhalten der Steuereinrichtung durch das über die Rückströmdrossel verkörperte Zeitglied zusätzlich beeinflußt werden.Due to the characterizing features of claim 4, the control behavior of the control device can be additionally influenced by the timing element embodied via the backflow throttle.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung anhand einer einzigen Figur dargestellt und in der nachfolgenden Beschreibung näher erläutert.An embodiment of the invention is shown in the drawing using a single figure and explained in more detail in the following description.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Die Steuereinrichtung für das Stillsetzen einer Dieselbrennkraftmaschine gemäß der einzigen, vereinfacht dargestellten Figur besteht aus einem elektrischen Steuerkreis 11 und einem mit diesem zusammenwirkenden hydraulischen Steuerkreis 12 und bildet eine Anlaß- und Abstelleinrichtung.The control device for stopping a diesel internal combustion engine according to the single figure shown in simplified form consists of an electrical control circuit 11 and a hydraulic control circuit 12 which interacts with it and forms a starting and stopping device.

An den elektrischen Steuerkreis 11 ist eine Batterie 13, ein Betriebskontakt 14 eines nicht dargestellten Hauptschalters, der allgemein als Lenkradschloß bezeichnet ist, ein mit dem Betriebskontakt 14 in Reihe geschalteter, als Öffner ausgebildeter Schaltkontakt 16, der von einem Dieselmotorsteuergerät 17 einer nicht dargestellten elektronischen Regeleinrichtung betätigt wird, sowie ein Elektromagnet eines als ein 2/2-Wegeventil ausgebildeten Magnetventils 19 angeschlossen.To the electrical control circuit 11 is a battery 13, an operating contact 14 of a main switch, not shown, which is generally referred to as a steering wheel lock, a switching contact 16, which is connected in series with the operating contact 14 and is designed as an opener, and which is operated by a diesel engine control unit 17 of an electronic control device, not shown is actuated, and an electromagnet of a solenoid valve 19 designed as a 2/2-way valve is connected.

Eine Ventilbaugruppe 21 des Magnetventils 19 ist bei stromlosem Elektromagnet 18 geöffnet und Teil des hydraulischen Steuerkreises 12, der eine das Motorschmieröl aufnehmende Ölwanne 22 aufweist, aus der eine zugleich mit der Brennkraftmaschine betriebene Ölpumpe 23 das Motorschmieröl zu den Schmierstellen der Brennkraftmaschine und in eine Druckleitung 24 fördert, in der die Ventilbaugruppe 21 eingefügt ist und die zum Druckstutzen 26 eines Stellzylinders 27 führt.A valve assembly 21 of the solenoid valve 19 is opened when the electromagnet 18 is de-energized and is part of the hydraulic control circuit 12, which has an oil pan 22 that receives the engine lubricating oil, from which an oil pump 23 operated simultaneously with the internal combustion engine supplies the engine lubricating oil to the lubrication points of the internal combustion engine and into a pressure line 24 promotes in which the valve assembly 21 is inserted and which leads to the pressure port 26 of an actuating cylinder 27.

In dem Stellzylinder 27 ist dichtend verschiebbar ein Stellkolben 28 gelagert, dessen dem Druckstutzen 26 zugewandte druckseitige Stirnfläche 29 einen Druckraum 31 begrenzt, in dem ein die Bewegung des Stellkolbens 28 in Richtung Volumeneinengung des Druckraums 31 hin beschränkender Anschlag 32 und ein Rückschlagventil 33 enthalten ist.An actuating piston 28 is mounted in a sealingly displaceable manner in the actuating cylinder 27, the pressure-side end face 29 facing the pressure connection 26 delimiting a pressure chamber 31, in which a stop 32 and a check valve 33 are contained, which restrict the movement of the actuating piston 28 in the direction of narrowing the volume of the pressure chamber 31.

Der Anschlag 32 ist einstellbar als Funktion von Betriebskenngrößen, beispielsweise als Funktion der Temperatur des Motorschmieröls.The stop 32 is adjustable as a function of operating parameters, for example as a function of the temperature of the engine lubricating oil.

Das Rückschlagventil 33 ist als Klappenventil ausgebildet und an einen, den Druckraum 31 abschließenden, stirnseitig angeordneten Boden 34 des Stellzylinders 27 angeschlagen und wölbt sich je nach Bauart infolge einer federnden Eigenspannung oder unter Strömungsdruck mit seinem freien Ende vom Boden 34 weg. Das Rückschlagventil 33 ist infolge seiner geringen Eigenspannung durch Strömungskräfte von aus dem Druckraum 31 zur Druckleitung 24 hin austretenden Motorschmieröls leicht an den Boden 30 anlegbar oder liegt durch Eigenspannung bereits am Boden 34 an.The check valve 33 is designed as a flap valve and attached to a bottom 34 of the actuating cylinder 27 which closes the pressure chamber 31 and, depending on the type, bulges away from the bottom 34 due to a resilient internal stress or under flow pressure. The check valve 33 is easy to apply to the base 30 due to its low internal stress due to flow forces from the engine lubricating oil emerging from the pressure chamber 31 to the pressure line 24 or is already applied to the base 34 due to internal stress.

Dadurch wird der Druckstutzen 26 in seinem Durchlaßquerschnitt bis auf einen geringen Restquerschnitt abgedeckt, wobei dieser durch eine in dem Rückschlagventil 33 befindliche Rückströmdrossel 36 gebildet wird. Der Stellkolben 28 wird an einer federraumseitigen, dem Druckraum 31 abgewandten Stirnfläche 37 durch die Kraft einer vorgespannten Rückstellfeder 38 belastet, die sich an eine, einen Federraum 39 abschließende, stirnseitig angeordnete Innenwandung 41 des Stellzylinders 27 abstützt.As a result, the pressure cross-section 26 is covered in its passage cross-section except for a small residual cross-section, this being formed by a backflow throttle 36 located in the check valve 33. The actuating piston 28 is loaded on an end face 37 on the spring chamber side facing away from the pressure chamber 31 by the force of a prestressed return spring 38, which is supported on an inner wall 41 of the actuating cylinder 27 that closes off a spring chamber 39.

Die druckseitige Stirnfläche 29 und die federraumseitige Stirnfläche 37 des Stellkolbens 28 sind durch einen als Längsbohrung in dem Stellkolben 28 ausgebildeten Abströmkanal 46 mit darin befindlicher Abströmdrossel 42 verbunden.The pressure-side end face 29 and the spring-side end face 37 of the actuating piston 28 are connected to an outflow throttle 42 located therein by an outflow channel 46 formed as a longitudinal bore in the actuating piston 28.

Gleichachsig zum Stellkolben 28 steht aus dessen federraumseitiger Stirnfläche 37 ein zapfenförmiges Übertragungsglied 43 hervor, das die Innenwandung 41 des Stellzylinders 27 durchdringt und in Eingriff bringbar ist mit der als Fördermengenverstellglied dienenden Regelstange 44.Coaxially with the actuating piston 28, a pin-shaped transmission member 43 protrudes from its end face 37 on the spring chamber side which penetrates the inner wall 41 of the actuating cylinder 27 and can be brought into engagement with the control rod 44 serving as the delivery rate adjustment member.

Alternativ zu diesem stirnseitigen Eingriff an der Regelstange 44 kann dieser bei beengten Anbauverhältnissen auch mittels eines strichpunktiert gezeichneten, rechtwinklig aus dem Stellkolben 28 vorstehendes Übertragungsglied 143 betätigt werden, das in diesem Fall in eine Längsnut 48 der Regelstange 44 oder in ein geeignetes Bauteil des Reglers eingreift, dieses in die Stoppstellung "0" verschiebt, im Normalbetrieb deren Regelbewegung aber nicht behindert.As an alternative to this frontal engagement on the control rod 44, it can also be actuated in the case of cramped mounting conditions by means of a dash-dotted transmission element 143 protruding at right angles from the actuating piston 28, which in this case engages in a longitudinal groove 48 of the control rod 44 or in a suitable component of the regulator , moves it to the stop position "0", but does not hinder its control movement in normal operation.

Die vorstehend beschriebene Anordnung weist den folgenden Funktions- und Wirkungsablauf auf. Ausgehend von einer betriebenen Dieselbrennkraftmaschine wird bei ihrer Abstellung der Betriebskontakt 14 des Hauptschalters in seine Offen- stellung gebracht, wobei der Elektromagnet 18 des Magnetventils 19 stromlos wird und die Ventilbaugruppe 21 in ihre, die Druckleitung 24 freigebende Ruhelage kommt.The arrangement described above has the following functional and operational sequence. Starting from an operated diesel internal combustion engine, when it is switched off, the operating contact 14 of the main switch is brought into its open position, the electromagnet 18 of the solenoid valve 19 being de-energized and the valve assembly 21 coming into its rest position, which releases the pressure line 24.

Die an die Brennkraftmaschine gekoppelte Ölpumpe 23 ist infolge der noch laufenden Brennkraftmaschine in der Lage, Motorschmieröl aus der Ölwanne 22 zu saugen und über die Druckleitung 24 zum Druckstutzen 26 zu fördern. Das bei gesperrtem Magnetventil 19 geschlossene Rückschlagventil 33 wird nun vom Druck des Motorschmieröls erfaßt und öffnet den Durchlaß am Boden 34, so daß das Motorschmieröl, das zuvor nur durch die Rückströmdrossel 36 strömen konnte, nun im Hauptstrom den Druckraum 31 erreicht, wodurch der Stellkolben 28 schnell entgegen der Kraft der Rückstellfeder 38 verschoben wird und das mit ihm verbundene Übertragungsglied 43 die Regelstange 44 zu einer Linksverlagerung, z. B. aus ihrer Startstellung "S" oder, wie gezeichnet, aus ihrer Vollaststellung "V" in ihre, die Kraftstofförderung abstellende Stoppstellung "0" bringt, in der der Regelweg 46 der Regelstange 44 eliminiert ist, d. h. zu null wird.Due to the still running internal combustion engine, the oil pump 23 coupled to the internal combustion engine is able to draw engine lubricating oil from the oil pan 22 and to deliver it to the pressure port 26 via the pressure line 24. The check valve 33, which is closed when the solenoid valve 19 is blocked, is now detected by the pressure of the engine lubricating oil and opens the passage at the bottom 34, so that the engine lubricating oil, which previously could only flow through the return flow throttle 36, now reaches the pressure chamber 31 in the main flow, as a result of which the actuating piston 28 is quickly moved against the force of the return spring 38 and the transmission member 43 connected to it, the control rod 44 to a left shift, z. B. from its starting position "S" or, as drawn, from its full load position "V" into its stop position "0", which stops the fuel delivery, in which the control path 46 of the control rod 44 is eliminated, ie becomes zero.

Damit ist die Kraftstoffzufuhr zur Brennkraftmaschine unterbrochen und das durch sie betriebene Kraftfahrzeug kann zum Stillstand kommen.The fuel supply to the internal combustion engine is thus interrupted and the motor vehicle operated by it can come to a standstill.

Das bei diesem Abstellvorgang vom Druckraum 31 über die Drossel 42 zum Federraum 39 überfließende Motorschmieröl gelangt aus dem Federraum 39 des Stellzylinders 27, z. B. entlang der Oberfläche des Übertragungsgliedes 43 bei einem nicht näher dargestellten sogenannten gemeinsamen Ölhaushalt der Kraftstoffeinspritzpumpe und der Brennkraftmaschine aus dem Pumpengehäuse in die Ölwanne 22 zurück.The overflow in this shutdown process from the pressure chamber 31 via the throttle 42 to the spring chamber 39 passes from the spring chamber 39 of the actuating cylinder 27, z. B. along the surface of the transmission member 43 in a so-called common oil balance of the fuel injection pump and the internal combustion engine, not shown, from the pump housing back into the oil pan 22.

Bei zum Stillstand gekommener Brennkraftmaschine kann die Ölpumpe 23, die ebenfalls zum Stillstand gekommen ist, kein weiteres Motorschmieröl zum Stellkolben 28 hin fördern und das im Druckraum 31 befindliche Motorschmieröl wird durch die Rechtsverlagerung des Stellkolbens 28 mittels der Kraft der Rückstellfeder 38 einerseits durch die Abströmdrossel 42 zum Federraum 39 und andererseits durch die Rückströmdrossel 36, die bei stromlosem Magnetventil 19 geöffnete Ventilbaugruppe 21, die Durchleitung 24 und die Ölpumpe 23 zur Ölwanne 22 verdrängt, insofern das Rückschlagventil 33 mit der Rückströmdrossel 36 versehen ist.When the internal combustion engine has come to a standstill, the oil pump 23, which has also come to a standstill, cannot deliver any further engine lubricating oil to the actuating piston 28, and the engine lubricating oil located in the pressure chamber 31 is displaced on the one hand by the outflow throttle 42 due to the rightward displacement of the actuating piston 28 by means of the force of the return spring 38 to the spring chamber 39 and on the other hand by the backflow throttle 36, which displaces the valve assembly 21 which is open when the solenoid valve 19 is de-energized, the passage 24 and the oil pump 23 to the oil pan 22, in so far as the check valve 33 is provided with the backflow throttle 36.

Mit der Rechtsverlagerung des Stellkolbens 28 und seines Übertragungsgliedes 43, die bis zum Auftreten der druckraumseitigen Stirnfläche 29 des Stellkolbens 28 auf den Anschlag 32 erfolgt, wird für die Regelstange 44 der volle Regelweg 47 freigegeben und die Regelstange 44 kann über eine mitvollzogene Rechtsverlagerung in die Startstellung "S" für maximale Kraftstoffeinspritzmenge gelangen.With the right-hand shift of the control piston 28 and its transmission element 43, which takes place until the appearance of the end face 29 of the control piston 28 on the pressure chamber on the stop 32, the full control path 47 is released for the control rod 44 and the control rod 44 can be moved to the start position by means of a right shift "S" for maximum fuel injection quantity.

Damit ist die für das bestellen der Brennkraftmaschine vorübergehend in die Stoppstellung gebrachte Regelstange 44 von selbst wieder in eine, den Start der Brennkraftmschine ermöglichende Betriebsstellung gelangt.The control rod 44, which has been temporarily brought into the stop position for ordering the internal combustion engine, has thus automatically returned to an operating position which enables the internal combustion engine to start.

Mit der beim Abstellvorgang erfolgten Rechtsverlagerung des Stellkolbens 28 legt sich das Rückschlagventil 33 durch die Strömungskräfte des zur Ölwanne 22 abfließenden Motorschmieröls an den Boden 34 an, womit sich der Abfluß des Motorschmieröls verlangsamt, da nun die geringe Querschnittsfläche der Rückströmdrossel 36 die Entleerung des Drackraums 31 Ölwanne 22 hin hemmt.With the shifting of the control piston 28 to the right during the shutdown process, the check valve 33 rests against the floor 34 due to the flow forces of the engine lubricating oil flowing out to the oil pan 22, whereby the outflow of the engine lubricating oil slows down, since the small cross-sectional area of the backflow throttle 36 now empties the drainage space 31 Oil pan 22 inhibits.

Damit wird verhindert, daß beim bestellen der Brennkraftmaschine der Druck des Motorschmieröls bei sehr niedriger Betriebsdrehzahl schon so weit abgefallen ist, daß der Regelweg 46 für die Regelstange 44 teilweise wieder freigegeben wird, die Brennkraftmaschine sich wieder fängt, erneut hochläuft und wieder nicht vollständig abstellt, so daß das durch die Brennkraftmaschine betriebene Kraftfahrzeug letztlich nicht zum Stillstand kommen würde.This prevents that when the internal combustion engine is ordered, the pressure of the engine lubricating oil has already dropped so far at a very low operating speed that the control path 46 for the control rod 44 is partially released again, the internal combustion engine catches itself again, starts up again and does not completely switch off again, so that the motor vehicle operated by the internal combustion engine would ultimately not come to a standstill.

Die Funktion des Rücklaufventils 33 mit der Rückströmdrossel 36 kann ersatzweise auch ein Rückschlagventil 33 ohne Rückströmdrossel 36 übernehmen, da der Rückfluß des Motorschmieröls bei sich nach rechts verlagerndem Stellkolben 28 bei sich nun im Sperrzustand befindlichem Rückschlagventil 33 auch schon allein über die Abströmdrossel 42 möglich ist, um der Regelstange 44 den notwendigen Regelweg 47 für die Startbereitschaft zu einem möglichen Wiederstart zu verschaffen.The function of the return valve 33 with the return flow throttle 36 can alternatively also be taken over by a check valve 33 without a return flow throttle 36, since the return flow of the engine lubricating oil with the control piston 28 shifting to the right with the check valve 33 now in the blocked state is already possible solely via the discharge throttle 42, in order to provide the control rod 44 with the necessary control path 47 for readiness to start again.

Claims (4)

  1. Control device for bringing to rest an internal combustion engine, in particular a diesel internal combustion engine, having a starting and shut-down device which can be operated by a main switch (14) by means of a key, which starting and shut-down device includes a shut-down element (12) acting on the delivery quantity adjustment element (44) of a fuel injection pump, controlled by a solenoid valve (19) and operated by the engine lubricating oil pressure, and an electrical control circuit (11) having the main switch (14) and the electromagnet (18) of the solenoid valve (19), the solenoid valve (19) being controllable by a control signal which can be initiated by the main switch in such a way that, in order to shut down the internal combustion engine, the delivery quantity adjusting element (44) of the fuel injection pump is adjusted by the engine lubricating oil pressure acting in a pressure space (31) of the shut-down element (12) into a stop position "0" and, after the rest condition has been reached, is adjusted by a return spring (38) into a start position "S" permitting the internal combustion engine to restart, the solenoid valve (19) being designed as a 2-position directional control valve, characterised in that the solenoid valve (19) can be additionally triggered by a switch contact (16) of a diesel engine control unit (17) of an electronic control device, in that the solenoid valve (19) is a 2/2-way valve which is open when no electricity is supplied, in that the shut-down element has an actuating piston (28) guided in an actuating cylinder (27) and forming the boundary, as a movable wall, of the pressure space (31) and an outlet flow throttle (42) connecting the pressure space (31) to a lower pressure space in order to permit restart and also has a non-return valve (33) downstream of the solenoid valve (19) and opening towards the pressure space (31).
  2. Control device according to Claim 1, characterised in that the outlet flow throttle (42) is located in an outlet flow passage (46) bypassing the actuating piston (28), this outlet flow passage (46) connecting the pressure space (31) to a spring space (39), which accommodates the return spring (38) and acts as a low-pressure space, and preferably extending within the actuating piston (28), the spring space (39) bordering on an end surface (37), facing away from the pressure space (31), of the actuating piston (28).
  3. Control device according to Claim 1 or 2, characterised in that the non-return valve (33) is a flap valve which, in the rest condition, takes up because of internal stress a position shutting off the flow and which can be pressed open by hydrodynamic forces of the engine oil flowing in.
  4. Control device according to one of Claims 1-3, characterised in that the non-return valve (33) is provided with a return flow throttle (36) which relieves the pressure space (31) in a delayed fashion when the solenoid valve (19) is open.
EP90903789A 1989-07-20 1990-03-09 Control device for stopping an internal combustion engine Expired - Lifetime EP0435965B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3924128A DE3924128A1 (en) 1989-07-20 1989-07-20 CONTROL DEVICE FOR STOPPING AN INTERNAL COMBUSTION ENGINE
DE3924128 1989-07-20

Publications (2)

Publication Number Publication Date
EP0435965A1 EP0435965A1 (en) 1991-07-10
EP0435965B1 true EP0435965B1 (en) 1992-12-02

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EP90903789A Expired - Lifetime EP0435965B1 (en) 1989-07-20 1990-03-09 Control device for stopping an internal combustion engine

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US (1) US5131358A (en)
EP (1) EP0435965B1 (en)
JP (1) JPH04501160A (en)
DE (2) DE3924128A1 (en)
WO (1) WO1991001445A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4217940A1 (en) * 1992-05-30 1993-12-02 Bosch Gmbh Robert Fuel injection pump for internal combustion engines
JP2589461Y2 (en) * 1993-12-16 1999-01-27 新キャタピラー三菱株式会社 Engine control device
CN106211774B (en) 2013-08-02 2020-11-06 辉瑞公司 anti-CXCR 4 antibodies and antibody-drug conjugates
JP6882151B2 (en) * 2017-12-14 2021-06-02 株式会社クボタ Stop device for engine

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE705567C (en) * 1936-08-09 1941-05-03 Kloeckner Humboldt Deutz Akt G Safety device for internal combustion engines
US2208299A (en) * 1937-09-18 1940-07-16 Eclipse Aviat Corp Emergency throttle-control means for aircraft engines
US3202161A (en) * 1961-11-14 1965-08-24 Wagner Electric Corp Engine safety control device and system
DE1576658B2 (en) * 1967-06-16 1977-03-03 Daimler-Benz Ag, 7000 Stuttgart STARTING AND STOPPING DEVICE FOR ROAD VEHICLES EQUIPPED WITH A SELF-IGNITING INJECTION COMBUSTION ENGINE
ES437992A1 (en) * 1975-05-28 1976-04-16 San Sebastian Saizar Safety apparatus for stopping an internal combustion engine in response to irregularities occur in the oil pressure or in the water temperature
FR2333952A1 (en) * 1975-12-01 1977-07-01 Rognon Armand SAFETY SYSTEM FOR DIESEL ENGINES
DE2554569A1 (en) * 1975-12-04 1977-06-08 Daimler Benz Ag ARRANGEMENT FOR STOPPING AND / OR STARTING AN AIR COMPRESSING COMBUSTION ENGINE FOR DRIVE, IN PARTICULAR A MOTOR VEHICLE
US4124013A (en) * 1977-06-29 1978-11-07 Rivalto Michael A Fuel level responsive means
DE2848232A1 (en) * 1978-11-07 1980-05-08 Bosch Gmbh Robert CONTROL DEVICE OF A FUEL INJECTION PUMP FOR VEHICLE DIESEL INTERNAL COMBUSTION ENGINES
GB2102499B (en) * 1981-07-24 1985-01-30 Vysoke Uceni Tech Brne A device for stopping a fuel injection engine, especially a vehicle engine

Also Published As

Publication number Publication date
DE59000551D1 (en) 1993-01-14
US5131358A (en) 1992-07-21
WO1991001445A1 (en) 1991-02-07
EP0435965A1 (en) 1991-07-10
JPH04501160A (en) 1992-02-27
DE3924128A1 (en) 1991-01-31

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