EP0257264B1 - Apparatus with an injection pump - Google Patents

Apparatus with an injection pump Download PDF

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Publication number
EP0257264B1
EP0257264B1 EP87110056A EP87110056A EP0257264B1 EP 0257264 B1 EP0257264 B1 EP 0257264B1 EP 87110056 A EP87110056 A EP 87110056A EP 87110056 A EP87110056 A EP 87110056A EP 0257264 B1 EP0257264 B1 EP 0257264B1
Authority
EP
European Patent Office
Prior art keywords
control device
digital control
shut
diesel engine
digital
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87110056A
Other languages
German (de)
French (fr)
Other versions
EP0257264A3 (en
EP0257264A2 (en
Inventor
Manfred Pfalzgraf
Kurt Probst
Andreas Wokan
Bernhard Stoll
Heinz-Friedrich Ohm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mannesmann VDO AG
Original Assignee
Mannesmann VDO AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mannesmann VDO AG filed Critical Mannesmann VDO AG
Publication of EP0257264A2 publication Critical patent/EP0257264A2/en
Publication of EP0257264A3 publication Critical patent/EP0257264A3/en
Application granted granted Critical
Publication of EP0257264B1 publication Critical patent/EP0257264B1/en
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Expired - Lifetime legal-status Critical Current

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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
    • F02D41/30—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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F02D11/107—Safety-related aspects
    • 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
    • F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
    • 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

Definitions

  • the invention relates to an arrangement for a diesel engine, the injection pump has a power control element and a shutdown element, both of which can be controlled by a common digital control device, according to the preamble of the main claim.
  • an emergency stop function is in place.
  • a shut-off element also located on the injection pump is actuated.
  • the object of the present invention is to make it possible, in the event of a defect in the area of the control of the power control element of an injection pump, to keep the engine running at an uncritical speed.
  • the engine speed is automatically reduced to a non-critical value in the event of a defect in the system formed by the digital control device and the power control element.
  • a further development of the invention is that the digital control device and the shut-off element form a two-point controller. This makes it possible in a simple manner to maintain the specified speed value with the required accuracy.
  • a linear actuating behavior can also be achieved by using a suitable actuator and at a suitable clock frequency.
  • the shut-off element can be designed so sluggishly in connection with an assigned actuator that the speed results from the mean value of the pulses if the clock frequency is sufficiently high.
  • the arrangement according to the invention can also be expanded such that the pulsating control of the shut-off element can be triggered when the permissible operating conditions are exceeded.
  • the engine power can be limited, e.g. B. on the maximum speed of the vehicle or maximum engine speed.
  • a further development consists in that a device for linking a signal emitted by the digital control device with another signal provided for switching off the diesel engine is arranged between an output of the digital control device provided for the switch-off element and the switch-off element. This means that the engine can be switched off at any time independently of the digital control device.
  • the invention allows numerous embodiments. One of them is shown schematically in the drawing and described below.
  • a digital control device 1 is connected to an actuator 2, which can consist in a manner known per se of an electric motor with a downstream transmission.
  • the actuator 2 is connected to the power control element 4 of an injection pump 5 of a diesel engine, not shown, via a linkage 3.
  • a setpoint value for the engine power is supplied to the digital control device by an accelerator pedal 6. Furthermore, the digital control device is connected to sensors 7, 8 for the speed n and the speed v.
  • the arrangement according to the invention can also be used to limit the engine speed or speed.
  • a correspondingly modified or supplemented program is to be provided in the digital control device, so that the shut-off mechanism 10 is actuated not only in the event of a defect, but also in the normal operating case when the permissible operating conditions, for example the permissible speed, are exceeded.

Description

Die Erfindung betrifft eine Anordnung für einen Dieselmotor, dessen Einspritzpumpe ein Leistungsstellelement und ein Abstellelement aufweist, die beide von einer gemeinsamen digitalen Steuereinrichtung steuerbar sind, nach der Gattung des Hauptanspruchs.The invention relates to an arrangement for a diesel engine, the injection pump has a power control element and a shutdown element, both of which can be controlled by a common digital control device, according to the preamble of the main claim.

Eine solche Anordnung ist aus der GB-A 2 102 064 bekannt.Such an arrangement is known from GB-A 2 102 064.

Bei der Ansteuerung von Leistungsstellelementen von Einspritzpumpen mit Hilfe von digitalen Steuereinrichtungen tritt im Fehlerfall, z.B. bei einer Verklemmung in Laststellung, zur Vermeidung von kritischen Betriebszuständen bei bekannten Anordnungen eine Notstopfunktion in Kraft. Dazu wird ein ebenfalls an der Einspritzpumpe befindliches Abstellelement betätigt.When controlling the power control elements of injection pumps with the aid of digital control devices, in the event of a fault, e.g. in the event of a jam in the load position, in order to avoid critical operating states in known arrangements, an emergency stop function is in place. For this purpose, a shut-off element also located on the injection pump is actuated.

Durch das Abstellen des Motors ist jedoch der kritische Betriebszustand nicht behoben, sondern durch den Ausfall von Servo- und Hilfsaggregaten entstehen weitere kritische Zustände.However, switching off the engine does not eliminate the critical operating state, but further critical states arise due to the failure of the servo and auxiliary units.

Aufgabe der vorliegenden Erfindung ist es, bei einem Defekt im Bereich der Steuerung des Leistungsstellelementes einer Einspritzpumpe zu ermöglichen, daß der Motor mit einer unkritischen Drehzahl weiterLäuft.The object of the present invention is to make it possible, in the event of a defect in the area of the control of the power control element of an injection pump, to keep the engine running at an uncritical speed.

Die Lösung dieser Aufgabe erfolgt mit den im kennzeichnenden Teil des Hauptanspruchs angegebenen Maßnahmen.This problem is solved with the measures specified in the characterizing part of the main claim.

Hierdurch wird automatisch bei einem Defekt innerhalb des von der digitalen Steuereinrichtung und des Leistungsstellelementes gebildeten Systems die Motordrehzahl auf einen unkritischen Wert herabgesetzt.As a result, the engine speed is automatically reduced to a non-critical value in the event of a defect in the system formed by the digital control device and the power control element.

Eine Weiterbildung der Erfindung besteht darin, daß die digitale Steuereinrichtung und das Abstellelement einen Zweipunktregler bilden. Hierdurch ist es in einfacher Weise möglich, den vorgegebenen Drehzahlwert mit der erforderlichen Genauigkeit einzuhalten.A further development of the invention is that the digital control device and the shut-off element form a two-point controller. This makes it possible in a simple manner to maintain the specified speed value with the required accuracy.

Anstelle des Zweipunktreglers kann auch durch Verwendung eines geeigneten Stellers und bei einer geeigneten Taktfrequenz ein lineares Stellverhalten erreicht werden. Dazu kann das Abstellelement in Verbindung mit einem zugeordneten Stellglied derart träge ausgelegt werden, daß sich bei genügend hoher Taktfrequenz die Drehzahl aus dem Mittelwert der Impulse ergibt.Instead of the two-point controller, a linear actuating behavior can also be achieved by using a suitable actuator and at a suitable clock frequency. For this purpose, the shut-off element can be designed so sluggishly in connection with an assigned actuator that the speed results from the mean value of the pulses if the clock frequency is sufficiently high.

Die erfindungsgemäße Anordnung kann jedoch auch dahingehend erweitert werden, daß die pulsierende Steuerung des Abstellelementes bei Überschreiten von zulässigen Betriebsbedingungen auslösbar ist. Hiermit kann also, auch ohne daß ein Fehler in der digitalen Steuereinrichtung oder beim Leistungsstellelement vorliegt, eine Begrenzung der Motorleistung erfolgen, z. B. auf maximale Geschwindigkeit des Fahrzeugs bzw. maximale Motordrehzahl.However, the arrangement according to the invention can also be expanded such that the pulsating control of the shut-off element can be triggered when the permissible operating conditions are exceeded. This means that, even without an error in the digital control device or in the power control element, the engine power can be limited, e.g. B. on the maximum speed of the vehicle or maximum engine speed.

Ferner besteht eine Weiterbildung darin, daß zwischen einem für das Abstellelement vorgesehenen Ausgang der digitalen Steuereinrichtung und dem Abstellelement eine Einrichtung zur Verknüpfung eines von der digitalen Steuereinrichtung abgegebenen Signals mit einem weiteren für das Abstellen des Dieselmotors vorgesehenen Signal angeordnet ist. Dadurch ist eine von der digitalen Steuereinrichtung unabhängige Abstellung des Motors jederzeit möglich.A further development consists in that a device for linking a signal emitted by the digital control device with another signal provided for switching off the diesel engine is arranged between an output of the digital control device provided for the switch-off element and the switch-off element. This means that the engine can be switched off at any time independently of the digital control device.

Ferner ist es möglich, in der digitalen Steuereinrichtung verschiedene vorgegebene Drehzahlen zu speichern, auf die der Motor je nach Art des vorhandenen Defekts oder nach anderen Umständen geregelt wird.Furthermore, it is possible to store various predetermined speeds in the digital control device, to which the motor is regulated depending on the type of defect present or other circumstances.

Die Erfindung läßt zahlreiche Ausführungsformen zu. Eine davon ist schematisch in der Zeichnung dargestellt und nachfolgend beschrieben.The invention allows numerous embodiments. One of them is shown schematically in the drawing and described below.

Bei dem in der Zeichnung dargestellten Ausführungsbeispiel ist eine digitale Steuereinrichtung 1 mit einem Stellglied 2 verbunden, welches in an sich bekannter Weise aus einem Elektromotor mit einem nachgeschalteten Getriebe bestehen kann. Über ein Gestänge 3 ist das Stellglied 2 an das Leistungsstellelement 4 einer Einspritzpumpe 5 eines nicht dargestellten Dieselmotors angeschlossen. Der Verstellbereich des Stellgliedes 2 und des Leistungsstellelementes 4 erstreckt sich zwischen LL = Leerlauf und VL = Vollast.In the exemplary embodiment shown in the drawing, a digital control device 1 is connected to an actuator 2, which can consist in a manner known per se of an electric motor with a downstream transmission. The actuator 2 is connected to the power control element 4 of an injection pump 5 of a diesel engine, not shown, via a linkage 3. The adjustment range of the actuator 2 and the power control element 4 extends between LL = idle and VL = full load.

Der digitalen Steuereinrichtung wird von einem Gaspedal 6 ein Sollwert für die Motorleistung zugeführt. Ferner ist die digitale Steuereinrichtung an Geber 7, 8 für die Drehzahl n und die geschwindigkeit v angeschlossen.A setpoint value for the engine power is supplied to the digital control device by an accelerator pedal 6. Furthermore, the digital control device is connected to sensors 7, 8 for the speed n and the speed v.

In der an sich bekannten digitalen Steuereinrichtung 1 sind nun durch entsprechende programmierung oder schaltungsmäßige Ausgestaltung Einrichtungen vorgesehen, die einen Fehler innerhalb des Regelkreises erkennen lassen. Sobald ein derartiger Fehler auftritt, wird über ein weiteres Stellglied 9 der Abstellmechanismus 10 der Einspritzpumpe 5 im Sinne eines Abstellens des Motors betätigt. Sobald jedoch die Drehzahl n unter einen vorgegebenen Wert gefallen, ist, wird über das Stellglied 9 der Abstellmechanismus wieder geöffnet. Dadurch stellt sich eine der vorgabe entsprechende Drehzahl ein.In the digital control device 1 known per se, devices are now provided by appropriate programming or circuit-like design, which can detect an error within the control loop. As soon as such an error occurs, the shut-off mechanism 10 of the injection pump 5 is actuated via a further actuator 9 in the sense of turning off the engine. However, as soon as the speed n has fallen below a predetermined value, the shut-off mechanism is opened again via the actuator 9. This sets a speed that corresponds to the specification.

In der Zeichnung ist mit Hilfe einer Diode 11 ferner angedeutet, daß das von der digitalen Steuereinrichtung 1 zum Stellglied 9 geführte Signal mit einem weiteren bei 12 zugeführten Signal verknüpft sein kann, wobei das bei 12 zugeführte Signal einen Vorrang genießt.In the drawing, with the aid of a diode 11, it is also indicated that the signal led from the digital control device 1 to the actuator 9 can be linked to a further signal supplied at 12, the signal supplied at 12 having priority.

Dadurch ist es möglich, ohne Rücksicht auf die digitale Steuereinrichtung sowie mögliche Fehlfunktionen derselben den Motor abzustellen.This makes it possible to switch off the engine regardless of the digital control device and possible malfunctions thereof.

Wie bereits eingangs erwähnt, kann die erfindungsgemäße Anordnung auch zur Begrenzung der Motordrehzahl oder Geschwindigkeit genutzt werden. Dazu ist ein entsprechend geänderter oder ergänztes Programm in der digitalen Steuereinrichtung vorzusehen, so daß der Abstellmechanismus 10 nicht nur bei einem Defekt, sondern im normalen Betriebsfall auch bei einem Überschreiten der zulässigen Betriebsbedingungen, beispielsweise der zulässigen Geschwindigkeit, betätigt wird.As already mentioned at the beginning, the arrangement according to the invention can also be used to limit the engine speed or speed. For this purpose, a correspondingly modified or supplemented program is to be provided in the digital control device, so that the shut-off mechanism 10 is actuated not only in the event of a defect, but also in the normal operating case when the permissible operating conditions, for example the permissible speed, are exceeded.

Claims (6)

1. Digital for a diesel engine, which controls a power-adjusting element (4) and a shutoff element (10) of an injection pump (5), characterized in that first means, which pulsatingly control the shutoff element (10) in such a way that predeterminable speeds of the diesel engine are achieved, are provided in the digital control device (1), and in that second means are provided which react to a defect in the region of the control of the power-adjusting element (4) and trigger the pulsating control of the first means.
2. Arrangement according to Claim 1, characterized in that the digital control device (1) and the shut- off element (10) form a two-position controller.
3. Arrangement according to Claim 1, characterized in that, due to the use of a suitable actuator and at a suitable clock frequency, the adjustment behaviour is linear.
4. Digital control device according to one of Claims 1 to 3, characterized in that the pulsating control of the shut-off element (10) can be triggered when permissible operating conditions are exceeded.
5. Digital control device according to one of the preceding claims, characterized in that a device (11) for linking a signal emitted by the digital control device (1) with a further signal provided for shutting off the diesel engine is arranged between an output, provided for the shut-off element (10), of the digital control device (1) and the shut-off element (10).
6. Digital control device according to one of the preceding claims, characterized. in that various predetermined speeds, to which the diesel engine is controlled depending on the defect present or depending on other circumstances, are stored in the digital control device (1).
EP87110056A 1986-08-28 1987-07-11 Apparatus with an injection pump Expired - Lifetime EP0257264B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3629265 1986-08-28
DE19863629265 DE3629265A1 (en) 1986-08-28 1986-08-28 ARRANGEMENT WITH AN INJECTION PUMP

Publications (3)

Publication Number Publication Date
EP0257264A2 EP0257264A2 (en) 1988-03-02
EP0257264A3 EP0257264A3 (en) 1988-05-04
EP0257264B1 true EP0257264B1 (en) 1990-11-28

Family

ID=6308370

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87110056A Expired - Lifetime EP0257264B1 (en) 1986-08-28 1987-07-11 Apparatus with an injection pump

Country Status (5)

Country Link
US (1) US4823751A (en)
EP (1) EP0257264B1 (en)
JP (1) JPS63113156A (en)
BR (1) BR8704422A (en)
DE (2) DE3629265A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3844286C2 (en) * 1988-12-30 2002-03-07 Bosch Gmbh Robert Safety emergency operation method and safety emergency operation device for diesel internal combustion engines
JP2784608B2 (en) * 1990-09-28 1998-08-06 日立建機株式会社 Motor speed control device
DE4133558A1 (en) * 1991-10-10 1993-04-15 Bosch Gmbh Robert CONTROL SYSTEM FOR THE ELECTRIC FUEL PUMP OF AN INTERNAL COMBUSTION ENGINE
DE4207319C2 (en) * 1992-03-08 1994-06-16 Elsons Produktions Und Handels Actuator for speed-limiting control of a motor vehicle
JP3564148B2 (en) * 1992-05-08 2004-09-08 株式会社ボッシュオートモーティブシステム Fuel injection control system for internal combustion engine
US5370097A (en) * 1993-03-22 1994-12-06 Davis Family Trust Combined diesel and natural gas engine fuel control system and method of using such
JP2589461Y2 (en) * 1993-12-16 1999-01-27 新キャタピラー三菱株式会社 Engine control device
US10774762B2 (en) * 2017-03-06 2020-09-15 HELLA GmbH & Co. KGaA Purge pump system with emergency stop

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH518443A (en) * 1969-12-13 1972-01-31 Bosch Gmbh Robert Safety circuit on an electronically controlled diesel internal combustion engine
US3916854A (en) * 1972-06-26 1975-11-04 Barton R E Fuel-flow limiting apparatus
US3915130A (en) * 1973-08-28 1975-10-28 Nippon Denso Co Electric control circuit system for internal combustion engines
CA1088650A (en) * 1977-02-15 1980-10-28 Ralph I. Mason Electronic digital govenor
US4150654A (en) * 1977-08-11 1979-04-24 Caterpillar Tractor Co Engine and fuel shutdown control
JPS57193729A (en) * 1981-05-25 1982-11-29 Nissan Motor Co Ltd Fuel shutoff device of fuel injection pump
DE3130094A1 (en) * 1981-07-30 1983-02-17 Robert Bosch Gmbh, 7000 Stuttgart EMERGENCY CONTROL SYSTEM FOR A DIESEL INTERNAL COMBUSTION ENGINE
JPS5951133A (en) * 1982-09-16 1984-03-24 Diesel Kiki Co Ltd Electronic governor
JPS60206954A (en) * 1984-03-30 1985-10-18 Hino Motors Ltd Emergency stopping device for abnormal diesel-engine
DE3429672A1 (en) * 1984-08-11 1986-02-20 Robert Bosch Gmbh, 7000 Stuttgart SPEED CONTROL SYSTEM FOR INTERNAL COMBUSTION ENGINES
DE3603571A1 (en) * 1986-02-06 1987-08-13 Bosch Gmbh Robert EMERGENCY DRIVING DEVICE FOR A DIESEL INTERNAL COMBUSTION ENGINE WITH ELECTRONICALLY CONTROLLED FUEL MEASUREMENT

Also Published As

Publication number Publication date
DE3629265A1 (en) 1988-03-10
DE3766446D1 (en) 1991-01-10
EP0257264A3 (en) 1988-05-04
EP0257264A2 (en) 1988-03-02
JPS63113156A (en) 1988-05-18
BR8704422A (en) 1988-04-19
US4823751A (en) 1989-04-25

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