EP0326693A1 - 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
EP0326693A1
EP0326693A1 EP19880120970 EP88120970A EP0326693A1 EP 0326693 A1 EP0326693 A1 EP 0326693A1 EP 19880120970 EP19880120970 EP 19880120970 EP 88120970 A EP88120970 A EP 88120970A EP 0326693 A1 EP0326693 A1 EP 0326693A1
Authority
EP
European Patent Office
Prior art keywords
elab
safety
control
valve
speed
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.)
Withdrawn
Application number
EP19880120970
Other languages
German (de)
English (en)
Inventor
Ulrich Dipl.-Ing. Gerstung
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 EP0326693A1 publication Critical patent/EP0326693A1/fr
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/12—Introducing corrections for particular operating conditions for deceleration
    • F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
    • 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 in a reciprocating and simultaneously 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 interlocking which supplies the amount of fuel required for its operation to the internal combustion engine.
  • 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 is known, which is activated when an error 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 control regulator 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 indeed 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, i.e. is not in the neutral position.
  • the present invention is based on the problem of correct 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 signal box, for example, 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 can also not be recognized by the driver, 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 method and the device according to the invention achieve this object with the characterizing features of the main claim and of claim 4 and have the advantage that, on the one hand, the fuel cut-off safety shut-off valve (ELAB) can be checked during operation of the internal combustion engine and therefore also under operating conditions is the Drivers or other persons in the motor vehicle do not notice anything or practically nothing of this check.
  • ELAB fuel cut-off safety shut-off valve
  • the safety shutdown valve can be recognized to function properly in all circumstances, or it is possible to Defect of the ELAB function can be recognized immediately after each start, and always when the vehicle goes into overrun for a period sufficient for the duration of the ELAB function check.
  • This check has no undefined influences on the driving operation; An additional hardware effort is not necessary because it is possible to lay down the entire check routine in the area of the EDC regulation, for example in its program. As a result, the overall security of the EDC system is significantly increased and the possibility of unwanted engine startup or engine runaway is practically reduced to zero.
  • the drawing shows a highly schematic of the EDC control unit for the electronic diesel control and the quantity control box with the safety shut-off valve assigned to it.
  • the basic idea of the present invention is, in the overrun mode of the internal combustion engine, for example when the foot throttle is in the empty gas position, the vehicle speed controller is in the off position and the speed is greater than the idle speed, by a separate or otherwise initiated activation of the Quantity output stage to increase the (fuel) quantity supplied to the internal combustion engine, for example in a ramp-like manner, until a needle movement sensor NBF, which is already present in EDC operation of diesel engines to regulate the start of spraying, delivers pulses, ie until it is determined that injections are actually taking place.
  • a combustion start sensor or an injection pressure sensor can also be used in the pump element, in the fuel line or in the injection valve instead of the NBF needle movement sensor.
  • the safety shutoff valve ELAB is activated switched off, in other words, in the special embodiment of the safety shut-off valve ELAB, the latter is de-energized, so that the valve now, depending on the design, also mechanically interrupts a fuel flow channel in the housing of the injection pump by means of a bias spring, through which the fuel from the under a predetermined Delivery pressure standing inside the pump reaches the area of the pump piston.
  • the electronic control unit of the EDC diesel control is denoted by 10, and the quantity setting mechanism acted upon by the control unit 10 is denoted by 11.
  • the control unit 10 receives information about the speed n from a speed sensor 12, information about the accelerator pedal position from an accelerator position sensor 13 and, if desired, brake actuation information (brake light) and start information, together with signals from further sensors that are not necessarily explained here, for example via Cooling water, battery voltage and the like. and acts on the magnetic interlocking 14 in the fuel injection pump of the quantity interlocking 11 via a schematically indicated output stage 10a, wherein a position indicator 15 is also indicated.
  • the electromagnetic safety shut-off valve ELAB assigned to the quantity control unit or the fuel injection pump is designated 16 and is also acted upon by the control unit 10 via a control line 16a, for example as shown in the drawing via an OR gate 17, which corresponds to the indicated arrow 18 from a conventional one Safety logic circuit within the control unit 10 leading to a switch-off of the ELAB (correspondingly blocking the further fuel supply), which can result from a large number of states detected by the safety logic circuit.
  • An additional checking circuit 19 then receives from the existing sensors in parallel corresponding information and signals that enable overrun operation detection;
  • the output stage 10a in the EDC control unit is first activated to ramp up the quantity until injections are detected by the existing feedback, for example via the needle movement sensor.
  • the safety switching valve 16 is actuated by the checking circuit 19 via the OR gate 17 and, if the ELAB function is correct, the injection pulses which are arbitrarily initiated in overrun mode are switched off. At the same time, this means the detection of the perfect ELAB function; if, on the other hand, the injection pulses are not turned off, a warning can be given.
  • Such an additional monitoring circuit 19 can be implemented in any manner with only very little additional hardware expenditure, with corresponding comparators, gate circuits, amplifiers and the like. are known per se and can be used depending on the desired application, so that it does not need to be discussed in more detail.
  • the present invention is preferably implemented completely without additional hardware using appropriate additional programming in the functional sequence area of the electronic diesel control (EDC control unit); a corresponding (simplified) block flow diagram for the ELAB function check is given below (p.13), it should be pointed out that the functional sequences or functional blocks shown in the drawings or to be explained below do not limit the invention, but in particular serve to illustrate the basic functional effects thereof and to indicate special functional sequences in a possible form of implementation. It goes without saying that individual blocks and their functions can be implemented in analog, digital or hybrid technology; they can also, in whole or in part, corresponding areas of program-controlled digital systems, for example microprocessors, microcomputers, digital or analog logic circuits and the like. occupy or be stored directly in the microprocessor by designing the program sequence accordingly.
  • the ELAB function check made possible by the invention is also effective if the safety shut-off valve ELAB does not close completely, that is to say a residual quantity is possibly conveyed; Such a malfunction is also detected in the case of the additional injection processes, which are only minor in any case.
  • Another prerequisite for the functional check of the ELAB in the present invention is that it must be reversible, i.e. at the end of the test, the ELAB must open again safely, even at high pump interior pressures, when it is switched on. Most safety shut-off valves are capable of this or can be designed accordingly.
  • an ELAB function check only needs to be carried out once after each starting process, ie it is not necessary that a switch to ELAB function check is always made when the overrun condition is recognized. If overrun mode is recognized, then the Activation of the final output stage can be carried out, preferably two further decision blocks can be provided.
  • the first decision block concerns the fact that the test should only be carried out at sufficiently high engine speeds (n> n1), so that the engine speed does not drop to idle speed during the test and then either the faultless ELAB function can no longer be identified, because the idle controller takes over or the engine may stall if the ELAB does not open quickly enough.
  • a further decision block includes the possibility of expediently starting the test only when the vehicle is engaged, since in this case there is a larger flywheel mass for the engine. A transmission feedback or a vehicle speed signal can serve as a signal for this engaged state.
  • Corresponding safety-relevant diagnostic bits can be selected from all diagnostic bits of the EDC control using a mask. If no safety-related errors are reported, the ELAB can be switched on again; However, the defect message can also be saved, which is not shown in the block flow diagram, in order to check whether the same defect is recognized again during the next ElAB function checks or whether the ELAB has just got stuck in the meantime. If the ELAB continuously reports defects, then at least one error message is required so that the driver can initiate a check; if there are other safety-relevant errors, the warning signal must be set in any case.
  • the ELAB can then either be switched on again and normal volume control switched on, so that there is no interference with the operation of the motor vehicle; however, it is possible to either prevent the next starting process, or in any case to design the warning signal so that it can only be reset by a workshop. It is also possible to influence driving behavior when the ELAB is defective, such as reducing the injection quantity or reducing the maximum speed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
EP19880120970 1988-01-30 1988-12-15 Système de sécurité pour moteur à combustion interne Withdrawn EP0326693A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3802771 1988-01-30
DE19883802771 DE3802771A1 (de) 1988-01-30 1988-01-30 Sicherheitssystem fuer brennkraftmaschinen

Publications (1)

Publication Number Publication Date
EP0326693A1 true EP0326693A1 (fr) 1989-08-09

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EP19880120970 Withdrawn EP0326693A1 (fr) 1988-01-30 1988-12-15 Système de sécurité pour moteur à combustion interne

Country Status (3)

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EP (1) EP0326693A1 (fr)
JP (1) JPH01224435A (fr)
DE (1) DE3802771A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2628482A1 (fr) * 1988-03-12 1989-09-15 Bosch Gmbh Robert Procede et dispositif pour la mise en oeuvre du procede, pour surveiller un arret de securite dans des moteurs a combustion interne notamment pour des moteurs diesel
EP0411197A1 (fr) * 1989-08-04 1991-02-06 Robert Bosch Gmbh Commande électronique de moteur dans un véhicule automobile
WO1992013186A1 (fr) * 1991-01-18 1992-08-06 Automotive Products Plc Circuit de securite pour papillon des gaz
EP0437559B1 (fr) * 1989-08-04 1993-09-29 Robert Bosch Gmbh Procede et dispositif de commande et/ou de regulation de la puissance du moteur a combustion interne d'un vehicule
FR2750735A1 (fr) * 1996-07-03 1998-01-09 Bosch Gmbh Robert Procede et dispositif de surveillance d'un systeme d'injection

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3838267C2 (de) * 1988-11-11 1997-04-17 Bosch Gmbh Robert Verfahren und Vorrichtung zur Überwachung eines Sicherheitsabstellers bei Brennkraftmaschinen, insbesondere Dieselmotoren

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3301742A1 (de) * 1983-01-20 1984-07-26 Robert Bosch Gmbh, 7000 Stuttgart Sicherheitseinrichtung fuer eine brennkraftmaschine mit selbstzuendung
GB2144180A (en) * 1983-07-28 1985-02-27 Bosch Gmbh Robert Fault monitoring in a fuel injection system of an internal combustion engine
EP0170018A2 (fr) * 1984-08-03 1986-02-05 Robert Bosch Gmbh Procédé et dispositif d'autodiagnostic d'organes de réglage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3301742A1 (de) * 1983-01-20 1984-07-26 Robert Bosch Gmbh, 7000 Stuttgart Sicherheitseinrichtung fuer eine brennkraftmaschine mit selbstzuendung
GB2144180A (en) * 1983-07-28 1985-02-27 Bosch Gmbh Robert Fault monitoring in a fuel injection system of an internal combustion engine
EP0170018A2 (fr) * 1984-08-03 1986-02-05 Robert Bosch Gmbh Procédé et dispositif d'autodiagnostic d'organes de réglage

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2628482A1 (fr) * 1988-03-12 1989-09-15 Bosch Gmbh Robert Procede et dispositif pour la mise en oeuvre du procede, pour surveiller un arret de securite dans des moteurs a combustion interne notamment pour des moteurs diesel
EP0411197A1 (fr) * 1989-08-04 1991-02-06 Robert Bosch Gmbh Commande électronique de moteur dans un véhicule automobile
US5048479A (en) * 1989-08-04 1991-09-17 Robert Bosch Gmbh Electronic engine control for a motor vehicle
EP0437559B1 (fr) * 1989-08-04 1993-09-29 Robert Bosch Gmbh Procede et dispositif de commande et/ou de regulation de la puissance du moteur a combustion interne d'un vehicule
WO1992013186A1 (fr) * 1991-01-18 1992-08-06 Automotive Products Plc Circuit de securite pour papillon des gaz
FR2750735A1 (fr) * 1996-07-03 1998-01-09 Bosch Gmbh Robert Procede et dispositif de surveillance d'un systeme d'injection

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Publication number Publication date
DE3802771A1 (de) 1989-08-10
JPH01224435A (ja) 1989-09-07

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