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EP0326694B1 - Système de sécurité pour moteur à combustion interne - Google Patents

Système de sécurité pour moteur à combustion interne Download PDF

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Publication number
EP0326694B1
EP0326694B1 EP19880120971 EP88120971A EP0326694B1 EP 0326694 B1 EP0326694 B1 EP 0326694B1 EP 19880120971 EP19880120971 EP 19880120971 EP 88120971 A EP88120971 A EP 88120971A EP 0326694 B1 EP0326694 B1 EP 0326694B1
Authority
EP
European Patent Office
Prior art keywords
elab
safety
internal
safety shut
electromagnetic
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
EP19880120971
Other languages
German (de)
English (en)
Other versions
EP0326694A1 (fr
Inventor
Bernhard Dr. Dipl.-Ing Bonse
Werner Dipl.-Ing. Fischer
Gerhard Dipl.-Ing. Stumpp
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0326694A1 publication Critical patent/EP0326694A1/fr
Application granted granted Critical
Publication of EP0326694B1 publication Critical patent/EP0326694B1/fr
Anticipated expiration legal-status Critical
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
    • 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

Definitions

  • the invention relates to a method for monitoring a safety shutdown device in the form of an electromagnetic shutoff valve (ELAB) in internal combustion engines according to the preamble of claim 1 and an apparatus for carrying out the method according to the preamble of claim 4.
  • ELAB electromagnetic shutoff valve
  • a pump piston arranged in the housing of the fuel injection pump is set into a reciprocating and at the same time rotating movement, fuel flowing from the housing interior of the injection pump forming the suction space to the pump piston. From there, depending on the quantity set, the fuel reaches the pressure lines leading to the cylinders of the diesel engine.
  • a safety valve is arranged in the connecting line between the suction chamber and the pump piston inflow, which prevents the further fuel supply from the suction chamber to the pump piston interrupts when certain safety conditions are exceeded.
  • a safety condition is exceeded, for example, when the pump delivery pressure in the housing of the fuel injection pump corresponds to a higher speed that is above idle, but on the other hand an adjusting lever actuated, for example, by the accelerator pedal is in the idle position.
  • Another known emergency control device for the fuel metering system in particular a diesel engine, (DE-OS 32 38 191) has, in addition to a signal processing device with a control device for the fuel supply, a manually or also automatically switchable emergency control branch, which contains at least one boost pressure regulator and whose output signal in the event of a fault a fault detection circuit is connected to the signaling device which supplies the internal combustion engine with the amount of fuel required for its operation.
  • a minimum value selection circuit can be provided in the emergency control branch to include further operating conditions.
  • a reset device for a quantity-determining member in a fuel injection system for diesel engines which is activated when a fault occurs, for example the control circuit itself or a supply line is interrupted by one of the existing sensors with which Consequence that the setting of the quantity-determining member then corresponds to that for small injection quantities.
  • the problem here is that with such a protective adjustment in the direction of a smaller quantity of fuel to be supplied, the power output of the internal combustion engine can be reduced to such an extent that, for example, operation in difficult terrain can no longer be maintained.
  • EDC electronic diesel control
  • a safety device for an internal combustion engine with self-ignition (DE-OS 33 01 742), continuously certain signals relating to the operation of the internal combustion engine, such as accelerator pedal position, calculated setpoint of the control path, speed, brake pedal position and the like. and to create a corrected control path setpoint by selecting the minimum value and supplying it to the controller of the EDC system.
  • This corrected control path setpoint also serves to determine a control deviation, including a feedback of the actual control path signal. If the predetermined limits are exceeded, the known safety device either reacts by switching off the injection pump, de-energizing the output stage of the controller or introducing emergency operation.
  • problems can arise under certain circumstances because not all possible boundary conditions are included in the recording of the safety conditions.
  • an idle signal can be obtained by a corresponding idle contact on the accelerator pedal; however, this is not valid if, for example, the internal combustion engine is equipped with a vehicle speed controller.
  • a driver briefly depresses the brake pedal or even just taps, but on the other hand the foot pedal remains deflected, that is to say is not in the neutral position.
  • the present invention is based on the task of correcting Monitor the function of the electromagnetic shut-off valve itself continuously.
  • the EDC control unit In normal operation, the EDC control unit is able to detect a defect in the quantity interlocking, essentially due to a permanent control deviation in the control loop. The EDC control unit then switches off the fuel supply by means of a suitable safety logic using the electromagnetic shut-off valve.
  • the electromagnetic shut-off valve (ELAB), as a safety device, is therefore able to switch off the engine even when the quantity control box is jammed, for example, or when the power stage is well-alloyed (in the EDC control unit).
  • the continuous monitoring of the ELAB function is therefore absolutely necessary because of the importance of the ELAB, whereby However, difficulties arise here that the ELAB itself is part of the fuel metering device, like all other components and systems, and therefore its function cannot be checked separately.
  • This function consists in switching off the engine;
  • a defect of the ELAB cannot be recognized by the driver either, because when the voltage supply is switched off, not only is the possibly defective ELAB switched off, but of course the voltage supply for the quantity signal box and the other components is also switched off, i.e. they become currentless.
  • the driver or user of a motor vehicle equipped with such a system will continuously pay attention to, or even want to concern himself with, checking a certain safety component in the fuel quantity control of his vehicle.
  • the invention solves the problem of monitoring the correct function of the ELAB itself by the characterizing features of claim 1 and claim 4 and has the advantage that by decoupling the power supply of the EDC control unit on the one hand (and thus the quantity signal box) and of the electromagnetic shut-off valve (ELAB) on the other hand, regular functional checks of the ELAB and by the user of the motor vehicle, for example, also inevitably take place when the internal combustion engine is switched off.
  • the basic idea of the present invention is to decouple the power supply of the EDC control unit to the quantity signal box connected to it and the ELAB, so that with the basic function of the electromagnetic shut-off valve (ELAB) required here, the fuel flow is released when the power supply is provided, but is interrupted in the event of a power failure. It is possible to switch off the ELAB earlier than the EDC control unit. All in all, this is only a few seconds, but is completely sufficient for checking the ELAB for correct function. Due to the earlier switching off of the ELAB, the engine must practically stop at the same time; This can be detected by suitable sensors - if this does not happen, the ELAB is malfunctioning.
  • ELAB electromagnetic shut-off valve
  • the EDC control unit SG which fulfills a number of other tasks that need not be discussed here, contains at least one safety logic circuit SLo, which can have a large number of sensors for detecting operating conditions and, as safety logic, the fuel supply via the electromagnetic Shut-off valve (ELAB) shuts off.
  • ELAB electromagnetic Shut-off valve
  • the control unit SG is connected to the supply voltage with two inputs E1 and E2, the input E1 serving for the power supply of the EDC components including a quantity interlocking device, not shown, and the input E2 for the power supply of the electromagnetic shutoff valve ELAB.
  • These two inputs E1 and E2 are decoupled as follows.
  • the input E1 is connected to a voltage supply via a relay switch r, namely the plus voltage of the battery UB, which is also referred to as terminal 30 (terminal 30) in German.
  • the input E2 is connected to the vehicle electrical system voltage via a suitable switch S which is to be closed at the beginning of the driving operation of the motor vehicle and which is to be opened when the engine is switched off; this contact connection is referred to in German-language use as terminal 15 (terminal 15).
  • the relay contact r is switched by a relay RA with switch-off delay, which is connected to terminal 15 together with input E2 and is therefore supplied with current by the travel switch S.
  • the input E2 is used to actuate the electromagnetic shutoff valve ELAB in this case via an AND gate UG whose input is acted upon by the safety logic circuit already mentioned above.
  • the electromagnetic shut-off valve ELAB therefore only contains power and is able to release the fuel supply, for example by pulling in a valve blocking element, when the battery signal is high at input E2 via terminal 15 and from the safety logic circuit, that is to say the other functions properly Circuit component indicating signal is present.
  • control unit SG can have a fault memory, whereby the detection of the malfunction of the shut-off valve ELAB leads to the fact that the fault display is repeated on the next trip or in addition to a reduced injection quantity or additionally to a reduced maximum speed.
  • the combination of the safety logic circuit SLo caused by the invention, which controls the electromagnetic shut-off valve ELAB in conventional control devices, with the input E2 (or terminal 15) acted upon via the switch S can be done in the known systems within the control device by hardware or software or outside of the control unit.
  • the invention therefore enables a simple and reliable solution to the problem of fault detection of a redundant electromagnetic safety shut-off valve, the function or malfunction of which cannot be determined in normal operation, since the fuel supply is always (also) interrupted by the control unit via the quantity control box.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Claims (8)

1. Procédé pour surveiller un moyen de cou­pure de sécurité constitué par une électrovanne de coupure (ELAB) appliqué à des moteurs à combustion in­terne notamment des moteurs Diesel dont le dispositif de réglage de quantité est sollicité par un dispositif électronique de commande (EDC), le moyen de coupure de sécurité arrêtant l'envoi du carburant vers le moteur en présence d'un incident, procédé caractérisé en ce que lorsqu'on coupe le moteur on commande le moyen de coupure de sécurité (ELAB) pour arrêter l'alimentation en carburant et en ce que dans une période de tempori­sation qui fait suite, période pendant laquelle le mécanisme de réglage de débit n'est pas encore coupé, en exploitant un signal indiquant la vitesse de rota­tion, on constate que le moteur à combustion interne continue de tourner et qu'il y a un défaut de fonctionnement du moyen de coupure de sécurité (ELAB).
2. Procédé selon la revendication 1, carac­térisé en ce qu'on reconnaît un fonctionnement défec­tueux du moyen de coupure de sécurité si les signaux d'un capteur de mouvement d'aiguille ne disparaissent pas à l'intérieur d'une période prédéterminée.
3. Procédé selon la revendication 1 ou 2, caractérisé en ce que lorsqu'on détecte un fonctionne­ment défectueux il s'ensuit au moins un signal de défaut et/ou on met en mémoire le fonctionnement dé­fectueux ainsi reconnu et cette information est communiquée au conducteur en influençant les paramè­tres de fonctionnement (réduction de la quantité à injecter) ; vitesse de rotation maximale réduite.
4. Dispositif pour surveiller le moyen de coupure de sécurité, constitué par une électrovanne de coupure (ELAB) dans des moteurs à combustion interne notamment des moteurs Diesel dont le mécanisme de ré­ glage de débit est commandé à partir d'un dispositif électronique de commande (EDC) et dans lequel le moyen de coupure de sécurité coupe la poursuite de l'alimen­tation en carburant du moteur en cas d'incident, dispositif caractérisé par des premiers moyens qui, lorsqu'on coupe le moteur à combustion interne, com­mandent le moyen de coupure de sécurité (ELAB) pour interrompre l'alimentation en carburant et des seconds moyens qui, pendant une période de temporisation consécutive pendant laquelle le mécanisme de réglage de débit n'est pas encore coupé, détectent la poursui­te du fonctionnement du moteur à combustion interne en exploitant un signal indiquant la vitesse de rotation et reconnaissent ainsi un fonctionnement défectueux du moyen de coupure de sécurité (ELAB).
5. Dispositif selon la revendication 4, ca­ractérisé en ce que la ligne d'alimentation électrique du dispositif de commande (SG) est équipée d'un con­tact d'un relais de temporisation de coupure (RA) qui est mis en oeuvre immédiatement lorsqu'on arrête le véhicule par la ligne électrique dont le courant se coupe.
6. Dispositif selon la revendication 4 ou 5, caractérisé en ce que l'alimentation électrique du dispositif de commande (SG) est reliée à la batterie (borne 30) par le contact du relais de temporisation de coupure (RA) et l'alimentation électrique de l'électrovanne de coupure (ELAB) reçoit la tension du réseau embarqué par un interrupteur (contact S, borne correspondante 15) fermé pour le fonctionnement du vé­hicule et ouvert lorsque le véhicule ne fonctionne pas.
7. Dispositif selon l'une des revendica­tions 4 à 6, caractérisé en ce que l'électrovanne de coupure de sécurité (ELAB) ne libère l'alimentation en carburant qu'à la condition que le contact (S ; borne 15) assure l'alimentation en tension et que le circuit logique de sécurité (SLo) du dispositif de commande (SG) indique le fonctionnement correct des autres composants de dosage du carburant par un signal d'acceptation.
8. Dispositif selon la revendication 7, ca­ractérisé en ce que la commande de l'électrovanne de coupure de sécurité (ELAB) se fait par une porte ET (UG) à partir du circuit logique de sécurité (SLo) et par une entrée (E2) reliée au contact (S ; borne 15).
EP19880120971 1988-01-30 1988-12-15 Système de sécurité pour moteur à combustion interne Expired - Lifetime EP0326694B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3802770A DE3802770A1 (de) 1988-01-30 1988-01-30 Sicherheitssystem fuer brennkraftmaschinen
DE3802770 1988-01-30

Publications (2)

Publication Number Publication Date
EP0326694A1 EP0326694A1 (fr) 1989-08-09
EP0326694B1 true EP0326694B1 (fr) 1991-03-06

Family

ID=6346311

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880120971 Expired - Lifetime EP0326694B1 (fr) 1988-01-30 1988-12-15 Système de sécurité pour moteur à combustion interne

Country Status (4)

Country Link
US (1) US4905645A (fr)
EP (1) EP0326694B1 (fr)
JP (1) JP2749345B2 (fr)
DE (2) DE3802770A1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3808381C2 (de) * 1988-03-12 1996-07-11 Bosch Gmbh Robert Verfahren und Vorrichtung zur Überwachung eines Sicherheitsabstellers bei Brennkraftmaschinen
DE3844287A1 (de) * 1988-12-30 1990-07-05 Bosch Gmbh Robert Verfahren und vorrichtung zur ueberpruefung eines sicherheitsabstellers bei brennkraftmaschinen, insbesondere dieselmotoren
EP0411197B1 (fr) * 1989-08-04 1992-10-21 Robert Bosch Gmbh Commande électronique de moteur dans un véhicule automobile
DE3925881A1 (de) * 1989-08-04 1991-02-07 Bosch Gmbh Robert Verfahren und vorrichtung zur steuerung und/oder regelung der motorleistung einer brennkraftmaschine eines kraftfahrzeugs
JP2543299Y2 (ja) * 1989-12-14 1997-08-06 富士重工業株式会社 ディーゼルエンジンの停止装置
FR2660450B1 (fr) * 1990-03-30 1994-07-22 Marelli Autronica Sa Dispositif a maintien temporaire sous tension d'un calculateur et installation d'alimentation de moteur a combustion interne en comportant application.
JP3564148B2 (ja) * 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 内燃機関の燃料噴射制御システム
DE4237198A1 (de) * 1992-11-04 1994-05-05 Bosch Gmbh Robert Verfahren und Vorrichtung zur Überprüfung einer Überwachungseinheit
DE19632339A1 (de) * 1996-08-10 1998-02-12 Bosch Gmbh Robert Verfahren und Vorrichtung zur Überwachung eines Durchflußbegrenzers eines Kraftstoffzumeßsystems einer Brennkraftmaschine
DE19726183A1 (de) * 1997-06-20 1998-12-24 Bosch Gmbh Robert Verfahren und Vorrichtung zur Überwachung eines Kraftstoffzumeßsystems
KR20000006746A (ko) * 1999-10-27 2000-02-07 공종의 내연기관의 엔진회전수 급상승 제한장치
US7783404B2 (en) * 2005-07-16 2010-08-24 Cnh America Llc Apparatus and method for FNR calibration and testing neutral safety switch thresholds in an agricultural windrower
US9065275B2 (en) * 2013-08-26 2015-06-23 Infineon Technologies Austria Ag Driving circuit for an electric motor
US20150167589A1 (en) * 2013-12-13 2015-06-18 Hyundai Motor Company Method and apparatus for controlling high pressure shut-off valve
CN107355306B (zh) * 2017-08-25 2023-07-14 福建永强力加动力设备有限公司 一种燃油机

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2060005B2 (de) * 1970-12-05 1973-06-20 Rheinstahl Ag, 4300 Essen Einrichtung zum selbsttaetigen abstellen der brennstoffzufuhr bei dieselbrennkraftmaschinen
US4088110A (en) * 1976-10-29 1978-05-09 Sps Instrument Company Engine idle control
JPS57193729A (en) * 1981-05-25 1982-11-29 Nissan Motor Co Ltd Fuel shutoff device of fuel injection pump
DE3301742A1 (de) * 1983-01-20 1984-07-26 Robert Bosch Gmbh, 7000 Stuttgart Sicherheitseinrichtung fuer eine brennkraftmaschine mit selbstzuendung
DE3327157A1 (de) * 1983-07-28 1985-02-07 Robert Bosch Gmbh, 7000 Stuttgart Steuereinrichtung zum stillsetzen einer brennkraftmaschine
DE3327376C2 (de) * 1983-07-29 1995-08-03 Pierburg Gmbh & Co Kg Verfahren und Vorrichtung zur Steuerung der Stellung einer Drosselklappe in Ansaugrohr einer Brennkraftmaschine
DE3501588A1 (de) * 1985-01-18 1986-07-24 Voest-Alpine Friedmann GmbH, Linz Anordnung zum steuern und regeln des verstellweges der regelstange einer einspritzbrennkraftmaschine
US4648364A (en) * 1985-07-08 1987-03-10 Wills William H Engine protection apparatus

Also Published As

Publication number Publication date
JPH01224436A (ja) 1989-09-07
JP2749345B2 (ja) 1998-05-13
DE3861965D1 (de) 1991-04-11
US4905645A (en) 1990-03-06
EP0326694A1 (fr) 1989-08-09
DE3802770A1 (de) 1989-08-10

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