EP0147611B1 - Method and apparatus for regulating the rotational speed of a combustion engine - Google Patents

Method and apparatus for regulating the rotational speed of a combustion engine Download PDF

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Publication number
EP0147611B1
EP0147611B1 EP84113962A EP84113962A EP0147611B1 EP 0147611 B1 EP0147611 B1 EP 0147611B1 EP 84113962 A EP84113962 A EP 84113962A EP 84113962 A EP84113962 A EP 84113962A EP 0147611 B1 EP0147611 B1 EP 0147611B1
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EP
European Patent Office
Prior art keywords
speed
idling
combustion engine
threshold value
control
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Expired
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EP84113962A
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German (de)
French (fr)
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EP0147611A3 (en
EP0147611A2 (en
Inventor
Alfred Dipl.-Ing. Kratt
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D31/00Use of speed-sensing governors to control combustion engines, not otherwise provided for
    • F02D31/001Electric control of rotation speed
    • F02D31/002Electric control of rotation speed controlling air supply
    • F02D31/003Electric control of rotation speed controlling air supply for idle speed control
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/04Introducing corrections for particular operating conditions
    • F02D41/12Introducing corrections for particular operating conditions for deceleration
    • F02D41/123Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00Engines characterised by fuel-air mixture compression
    • F02B1/02Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder

Definitions

  • the invention relates to a method and a device for speed control in an internal combustion engine in each case according to the preamble of the main claim or the first device claim.
  • LFR idle charge control
  • a target speed and other peripheral information such an idle charge control, implemented in analog or digital technology, is able to maintain perfect idling of the internal combustion engine, which is the case, for example, when maneuvering or overrun and when changing from this to idling is important.
  • the invention is therefore based on the object of preventing an undesirable interaction of the two systems, possibly leading to malfunctions, in an internal combustion engine equipped with overrun cutoff and idle charge control.
  • the idle charge control has a controller with PID control behavior, such a controller using analog technology or what is currently available is preferred, can be realized on the basis of digitally working systems.
  • PID control behavior of the idle charge control results in a further advantage of the present invention, which lies in the fact that the reinsertion speed of the thrust cut-off becomes dynamic. If one looks at the situation from the side of the thrust cut-off, this means that when the speed drops rapidly, fuel is supplied again at a higher reinstallation speed, that is to say the fuel is injected again at the injection system than at a slowly falling speed.
  • FIG. 1 An embodiment of the invention is shown in the drawing and is explained in more detail in the following description.
  • the drawing shows a block diagram only for illustration and a highly schematic basic structure of an idle charge control and a fuel cut-off system as well as the interaction of these two systems realized by the invention.
  • the invention is shown on the basis of discrete circuit blocks of a block diagram which indicates idle charge control and thrust cut-off circuit in this respect also realized by means of discrete components or assemblies.
  • the area of the idle charge control in the drawing is grouped around a logic control circuit, a microcomputer, a microprocessor or the like, which is denoted by 10 and outputs the actuator control signal, which is denoted by r, at its output connection 10a.
  • this peripheral device also has the following modules: an input block 11, via which signals to be processed such as the actual value of the current speed n is , a speed setpoint n should and a temperature specification is supplied via the outside temperature.
  • Two further input blocks 12 and 13 are provided which, in the case of a microcomputer as a controller, are designed immediately as analog-digital converters and supply operating status information about the respective engine temperature and the battery voltage.
  • An external memory 14 supplies the central computer 10 with additional information which is stored for the generation of the actuator control signal.
  • the microcomputer 10 is a PID controller in terms of its construction and design, and uses the input parameters to create a required basic duty cycle for the actuator control signal, including appropriate correction variables and querying the external data memory 14.
  • the actuator control signal passes via an output stage 15 and an intermediate circuit block 16, which serves to switch off for safety reasons - this also includes the circuit elements 17 and 18, which together form a fail-safe safety circuit, but which need not be discussed further here, for the actuator 19.
  • the actuator is designed as a two-turn rotary actuator 19a, which controls a slide valve 19b connected as an air bypass parallel to the throttle valve for idle charge control, the desired passage cross section of which results from the pulse duty factor of the pulse train supplied to the two-winding rotary actuator as an actuator control signal.
  • the fuel metering system for the internal combustion engine is here merely representative of all possible forms as a preliminary stage 20 (control multivibrator stage) for the generation of so-called tp preliminary pulses, which preliminary stage is supplied with an air mass or air quantity specification from an input block 21, in addition to the speed signal n of the internal combustion engine.
  • the preliminary stage or control multivibrator stage 20 operates via an intermediate link stage 22 to a further stage of the fuel injection system, which can be referred to as a multiplier stage; however, the output signal of the overrun cutoff stage represented by block 30 also reaches logic stage 22, so that the pre-pulses tp are suppressed when overrun cutoff stage 30 detects the operating state overrun of the internal combustion engine.
  • Corresponding input signals are evaluated by the overrun cut-off stage.
  • the invention now begins at this point and first detects the size or amplitude of the idle charge control from the PID controller generated actuator control signal r. If this signal is generated analogously, this can be fed immediately to the one input of a comparator or comparator 40; if the actuator control signal r is modulated in its duty cycle, then a simple integrating block 41 can be interposed in order to gain an analog value if it is assumed that the invention works on an analog basis.
  • the actuator control signal r is compared with a suitable - ⁇ threshold, which is generated or specified by a block 42. It has proven to be useful and is therefore a preferred embodiment of the present invention to design the ⁇ threshold as a function of the engine temperature ⁇ M and to select it in such a way that the engine speed resulting from the respective T is in any case less than the cut-off speed of the overrun cutoff function.
  • the comparator 40 determines that the effective actuator control signal r is greater than the predetermined ⁇ threshold, then the information also results from this comparator. that this resulting increased engine speed is effectively due to a sensible reaction of the idle charge control, and the comparator then generates a blocking signal at its output 40a, which is fed to an input 30a of the overrun cut-off stage 30 and whose function under these circumstances (actuator control signal r greater than the predetermined one) r threshold) blocks, d. H. prohibiting the use of the overrun cutoff function as a whole.
  • the invention is therefore able to cleanly separate the functions of the idle charge control from the overrun fuel cutoff, to prevent mutual influences and to ensure a faultless process in the control of the instantaneous speed without vibrations in the smooth transition.

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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)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Verfahren und einer Vorrichtung zur Drehzahlregelung bei einer Brennkraftmaschine jeweils nach der Gattung des Hauptanspruchs bzw. des ersten Vorrichtungsanspruchs.The invention relates to a method and a device for speed control in an internal combustion engine in each case according to the preamble of the main claim or the first device claim.

Einrichtungen zur Drehzahlregelung bei Brennkraftmaschinen sind bekannt ; so ist es beispielsweise üblich, eine Leerlauffüllungsregelung (LFR) vorzusehen, die auf einen Luftbypass parallet zur Drosselklappe der Brennkraftmaschine arbeiten kann - üblicherweise ein Zweiwicklungs-Drehsteller. Unter Beachtung der momentanen Istdrehzahl der Brennkraftmaschine, einer Solldrehzahl und sonstiger peripherer Angaben ist eine solche Leerlauffüllungsregelung, ausgeführt in analoger oder digitaler Technik, in der Lage, einen einwandfreien Leerlauf der Brennkraftmaschine aufrechtzuerhalten, was beispielsweise im Rangier- oder Schubbetrieb und beim Übergang von diesen in den Leerlauf, wichtig ist.Devices for speed control in internal combustion engines are known; For example, it is common to provide an idle charge control (LFR) that can operate in parallel to an air bypass to the throttle valve of the internal combustion engine - usually a two-winding rotary actuator. Taking into account the current actual speed of the internal combustion engine, a target speed and other peripheral information, such an idle charge control, implemented in analog or digital technology, is able to maintain perfect idling of the internal combustion engine, which is the case, for example, when maneuvering or overrun and when changing from this to idling is important.

Andererseits ist es bei Brennkraftmaschinen bekannt, die Kraftstoffzufuhr im Betrieb dann zu unterbrechen, wenn bei höheren und hohen Drehzahlen die Drosselklappe geschlossen ist, die Brennkraftmaschine sich also im sogenannten Schubbetrieb befindet. Ein solcher Schubbetrieb liegt auch dann vor, wenn eine Brennkraftmaschine eine höhere Drehzahl aufweist als dies der Stellung der Drosselklappe beim Ottomotor oder der eingespritzten Kraftstoffmenge etwa bei einem Dieselmotor entspricht. Befindet sich die Brennkraftmaschine im Schubbetrieb, dann ist eine Arbeitsleistung nicht erwünscht und daher wird üblicherweise über die jeweilige Kraftstoffzufuhreinrichtung (Vergaser, Einspritzsysteme o. ä.) die der Brennkraftmaschine zugeführte Kraftstoffmenge reduziert oder ganz auf Null gestellt (Schubabschneiden SAS).On the other hand, it is known in internal combustion engines to interrupt the fuel supply during operation when the throttle valve is closed at higher and higher speeds, ie the internal combustion engine is in the so-called overrun mode. Such overrun operation is also present when an internal combustion engine has a higher rotational speed than the position of the throttle valve in the gasoline engine or the amount of fuel injected, for example in a diesel engine. If the internal combustion engine is in overrun mode, work is not desired and therefore the amount of fuel supplied to the internal combustion engine is usually reduced or completely set to zero (thrust cut-off SAS) via the respective fuel supply device (carburetor, injection systems or the like).

Es ist allerdings nicht ausgeschlossen, daß gerade dann, wenn beide, notwendigerweise voneinander unabhängig wirkende Systeme bei einer Brennkraftmaschine eingesetzt werden, Probleme entstehen können, beispielsweise dadurch, daß durch entsprechende Ansteuerung vom Regler der Leerlauffüllungregelung der LFR-Steller weit geöffnet ist aufgrund zu berücksichtigender betriebsbedingter Umstände (beispielsweise Start oder evtl. überhöhter Warmlauf) und dabei die tatsächliche Motordrehzahl kurzzeitig die für die Schubabschneideschaltung vorgegebene Abschneidedrehzahl überschreitet.However, it cannot be ruled out that problems can arise, especially when both systems, which necessarily operate independently of one another, are used in an internal combustion engine, for example by the LFR actuator being opened wide by appropriate control by the controller of the idle charge control due to operational considerations to be taken into account Circumstances (e.g. start or possibly excessive warm-up) and the actual engine speed briefly exceeds the cut-off speed specified for the thrust cut-off circuit.

Aus der US-PS 4 364 349 ist bekannt, bei Systemen mit Leerlaufdrehzahlregelung und Schubabschaltung die Abschneidedrehzahlschwelle um einen vorgegebenen Faktor während der Startphase der Brennkraftmaschine einige Sekunden lang zu erhöhen. Dadurch wird vermieden, daß während der Startphase aufgrund einer überhöhten Leerlaufdrehzahl eine Abschaltung der Kraftstoffzufuhr stattfindet, und der auf die Kraftstoffabschaltung folgende starke Drehzahlabfall wird unterbunden.From US Pat. No. 4,364,349 it is known to increase the cut-off speed threshold by a predetermined factor during the starting phase of the internal combustion engine for a few seconds in systems with idle speed control and overrun cutoff. This prevents the fuel supply from being cut off during the starting phase due to an excessive idling speed, and the sharp drop in speed following the fuel cut is prevented.

Auch außerhalb der Startphase ist es möglich, daß unter bestimmten betriebsbedingten Umständen die Abschneidedrehzahlschwelle von der Leerlaufdrehzahl überschritten wird, so daß die Schubabschneidefunktion wirksam werden würde. Dies kann zum sogenannten Sägen (unkontrolliertes Schwingungsverhalten) führen. Unter extremen Umständen und bei kalter Maschine könnte der Motor sogar ausgehen.Even outside the start-up phase, it is possible that, under certain operational conditions, the cut-off speed threshold is exceeded by the idling speed, so that the thrust cut-off function would become effective. This can lead to so-called sawing (uncontrolled vibration behavior). In extreme circumstances and when the machine is cold, the engine could even stop.

Der Erfindung liegt daher die Aufgabe zugrunde, bei einer mit Schubabschaltung und Leerlauffüllungsregelung ausgerüsteten Brennkraftmaschine ein gegebenenfalls zu Störungen führendes unerwünschtes Zusammenwirken beider Systeme zu verhindern.The invention is therefore based on the object of preventing an undesirable interaction of the two systems, possibly leading to malfunctions, in an internal combustion engine equipped with overrun cutoff and idle charge control.

Vorteile der ErfindungAdvantages of the invention

Diese Aufgabe lösen das erfindungsgemäße Verfahren bzw. die erfindungsgemäße Vorrichtung jeweils mit den kennzeichnenden Merkmalen des Hauptanspruchs bzw. des ersten Vorrichtungsanspruchs, wodurch sich der Vorteil ergibt, daß das Schubabschneiden immer dann verboten wird, wenn die Stelleröffnung der Leerlauffüllungsregelung Ursache für die Drehzahlüberhöhung ist, welche das Schubabschneiden verursacht. Es wird daher unter allen Umständen verhindert, daß durch die gleichzeitig wirkenden Funktionen der Leedauffüllungsregelung und des Schubabschneidens ein Sägen im Drehzahlverlauf der Brennkraftmaschine verursacht wird ; die Erfindung wirkt auch ausgleichend und behebt Störungen einwandfrei dort, wo bisher besonders kritische Zustände auftreten konnten, also direkt nach dem Startvorgang oder nach einem Auskuppeln, wenn hierbei das Fahrzeug unter die Leerlaufdrehzahl abgebremst worden ist.This object is achieved by the method according to the invention and the device according to the invention each with the characterizing features of the main claim or the first device claim, which results in the advantage that thrust cutting is prohibited whenever the actuator opening of the idle charge control is the cause of the speed increase, which thrust cutting causes. It is therefore prevented under all circumstances that sawing in the speed curve of the internal combustion engine is caused by the simultaneously acting functions of the leed filling control and the thrust cutting; the invention also has a compensating effect and eliminates faults perfectly where previously particularly critical conditions could have occurred, that is to say directly after the starting process or after disengaging, when the vehicle has been braked below the idling speed.

Um allen Anforderungen an einen einwandfreien Leerlauf einer Brennkraftmaschine gerecht zu werden und um insbesondere sicher Rettungsfunktionen einsetzen zu können, wenn die Brennkraftmaschine auszugehen droht, verfügt die Leerlauffüllungsregelung über einen Regler mit PID-Regelverhalten, wobei ein solcher Regler in analoger Technik oder auch, was gegenwärtig bevorzugt wird, auf der Basis digital arbeitender Systeme realisiert werden kann. Durch dieses stets vorhandene PID-Verhalten der Leerlauffüllungsregelung ergibt sich ein weiterer Vorteil vorliegender Erfindung, der darin liegt, daß die Wiedereinsetzdrehzahl des Schubabschneidens dynamisch wird. Betrachtet man den Sachverhalt von der Seite des Schubabschneidens aus, bedeutet dies, daß bei schnell fallender Drehzahl bei einer höheren Wiedereinsetzdrehzahl Kraftstoff wieder zugeführt, bei der Einspritzanlage also wieder eingespritzt wird, als bei langsam fallender Drehzahl. Der Grund hierfür liegt darin, daß durch den Vorhalt des D-Anteils im PID-Verhalten des Leerlauffüllungsreglers die Größe des berechneten Stelleransteuerungssignals r umso größer ist, je schneller die Motordrehzahl abfällt. Da aufgrund der erfindungsgemäßen Konzeption dieses berechnete τ mit einer vorgegebenen T-Schwelle verglichen wird und Schubabschneiden dann verboten wird, wenn das berechnete r größer als die Schwelle ist, ergibt sich als Folge hiervon, daß bei schnell abfallender Motordrehzahl das berechnete r sehr viel eher (D-Anteil) den Schwellenwert übersteigt und daher auch die Schubabschneidefunktion eher gesperrt wird. Die Erfindung greift daher in ihrer Grundkonzeption bis in die Funktion der Schubabschneideschaltung ein und gestaltet hierdurch das Schubabschneiden dynamisch, ohne daß es zusätzlicher Schaltungselemente und -komponenten bedarf.In order to meet all requirements for perfect idling of an internal combustion engine and, in particular, to be able to use rescue functions safely when the internal combustion engine threatens to go out, the idle charge control has a controller with PID control behavior, such a controller using analog technology or what is currently available is preferred, can be realized on the basis of digitally working systems. This always present PID behavior of the idle charge control results in a further advantage of the present invention, which lies in the fact that the reinsertion speed of the thrust cut-off becomes dynamic. If one looks at the situation from the side of the thrust cut-off, this means that when the speed drops rapidly, fuel is supplied again at a higher reinstallation speed, that is to say the fuel is injected again at the injection system than at a slowly falling speed. The reason for this is that through the D component in the PID behavior of the idle charge controller, the greater the size of the calculated actuator control signal r, the faster the engine speed drops. As a result of the concept according to the invention, this calculated τ is compared with a predetermined T threshold and thrust truncation is prohibited if the calculated r is greater than the threshold, as a result of this it follows that with a rapidly decreasing engine speed, the calculated r is much more likely ( D component) exceeds the threshold value and therefore the thrust cut-off function is also rather blocked. The invention therefore intervenes in its basic concept right up to the function of the thrust cut-off circuit, thereby designing the thrust cut-off dynamically without requiring additional circuit elements and components.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird in der nachfolgenden Beschreibung näher erläutert. Die Zeichnung zeigt anhand eines Blockschaltbildes lediglich zur Veranschaulichung und stark schematisiert Grundaufbau einer Leerlauffüllungsregelung und eines Schubabschaltesystems sowie das durch die Erfindung realisierte Zusammenwirken dieser beiden Systeme.An embodiment of the invention is shown in the drawing and is explained in more detail in the following description. The drawing shows a block diagram only for illustration and a highly schematic basic structure of an idle charge control and a fuel cut-off system as well as the interaction of these two systems realized by the invention.

Beschreibung der AusführungsbeispieleDescription of the embodiments

In der Zeichnung ist die Erfindung anhand diskreter Schaltungsblöcke eines Blockschaltbildes dargestellt, welches Leerlauffüllungsregelung und Schubabschneideschaltung insoweit auch durch diskrete Bauelemente oder Baugruppen realisiert angibt. Es versteht sich aber und liegt innerhalb des erfindungsgemäßen Rahmens, ist sogar ein bevorzugtes Ausführungsbeispiel vorliegender Erfindung, das gesamte System insbesondere auch mit Hilfe von Mitteln zu realisieren, die auf digitaler Basis entsprechende Steuersignale erzeugen und einem entsprechenden Zusammenwirken unterworfen sind. Hierzu gehören insbesondere die programmgesteuerte Ausbildung von Mikroprozessoren mit entsprechenden Ausgangssystemen, Stellgliedem und einer Sensor-Eingangsbeschaltung, Mikrorechner, aber auch Systeme auf analoger Basis.In the drawing, the invention is shown on the basis of discrete circuit blocks of a block diagram which indicates idle charge control and thrust cut-off circuit in this respect also realized by means of discrete components or assemblies. However, it goes without saying and is within the scope of the invention, and it is even a preferred embodiment of the present invention to implement the entire system in particular with the aid of means which generate corresponding control signals on a digital basis and are subjected to a corresponding interaction. This includes in particular the program-controlled training of microprocessors with corresponding output systems, actuators and a sensor input circuit, microcomputers, but also systems on an analog basis.

Die im folgenden angegebene Beschreibung eines bevorzugten Ausführungsbeispiels ist daher insbesondere bezüglich des funktionellen Ablaufs zu werten und bedient sich des Hinweises auf die einzelnen Schaltungsblöcke lediglich aus Gründen eines besseren Verständnisses.The description of a preferred exemplary embodiment given below is therefore to be evaluated in particular with regard to the functional sequence and uses the reference to the individual circuit blocks only for reasons of better understanding.

Der Bereich der Leerlauffüllungsregelung ist in der Zeichnung um eine logische Steuerschaltung, einen Mikrocomputer, einen Mikroprozessor o. dgl. gruppiert, der mit 10 bezeichnet ist und an seinem Ausgangsanschluß 10a das Stelleransteuerungssignal abgibt, welches mit r bezeichnet ist.The area of the idle charge control in the drawing is grouped around a logic control circuit, a microcomputer, a microprocessor or the like, which is denoted by 10 and outputs the actuator control signal, which is denoted by r, at its output connection 10a.

Beim speziellen Anwendungsfall und bei Ausbildung der zentralen Rechenheit 10 des Leerlauffüllungsreglers als Mikrocomputer verfügt dieser peripher noch über die folgenden Baugruppen : einen Eingangsblock 11, über den ihm zu verarbeitende Signale wie beispielsweise den Istwert der momentanen Drehzahl nist, ein Drehzahlsollwert nsoll und eine Temperaturangabe über die Außentemperatur zugeführt wird. Es sind zwei weitere Eingangsblöcke 12 und 13 vorgesehen, die, bei einem Mikrocomputer als Regler, sofort als Analog-Digitalumsetzer ausgebildet sind und Betriebszustandsangaben über die jeweilige Motortemperatur und die Batteriespannung zuführen. Ein externer Speicher 14 versorgt den zentralen Rechner 10 mit gespeicherten, für die Erstellung des Stelleransteuersignals zusätzlichen Angaben. Der Mikrocomputer 10 ist seinem Aufbau bzw. seiner Auslegung nach ein PID-Regler und erstellt aus den Eingangsparametern ein erforderliches Grundtastverhältnis für das Stelleransteuersignal unter Einschluß entsprechender Korrekturgrößen und Abfrage des externen Datenspeichers 14. Das Stelleransteuerungssignal gelangt über eine Endstufe 15 und einen Zwischenschaltungsblock 16, der der Abschaltung aus Sicherheitsgründen dient - hierzu gehören dann noch die Schaltungselemente 17 und 18, die insgesamt eine fail-safe-Sicherheitsschaltung bilden, auf die aber hier nicht weiter eingegangen zu werden braucht, zum Stellglied 19.In a special application and when the central processing unit 10 of the idle charge controller is designed as a microcomputer, this peripheral device also has the following modules: an input block 11, via which signals to be processed such as the actual value of the current speed n is , a speed setpoint n should and a temperature specification is supplied via the outside temperature. Two further input blocks 12 and 13 are provided which, in the case of a microcomputer as a controller, are designed immediately as analog-digital converters and supply operating status information about the respective engine temperature and the battery voltage. An external memory 14 supplies the central computer 10 with additional information which is stored for the generation of the actuator control signal. The microcomputer 10 is a PID controller in terms of its construction and design, and uses the input parameters to create a required basic duty cycle for the actuator control signal, including appropriate correction variables and querying the external data memory 14. The actuator control signal passes via an output stage 15 and an intermediate circuit block 16, which serves to switch off for safety reasons - this also includes the circuit elements 17 and 18, which together form a fail-safe safety circuit, but which need not be discussed further here, for the actuator 19.

Bei dem bevorzugten Ausführungsbeispiel ist das Stellglied als Zweiwicklungsdrehsteller 19a ausgebildet, der zur- Leerlauffüllungsregelung einen als Luftbypass parallel zur Drosselklappe geschalteten Schieber 19b ansteuert, dessen gewünschter Durchlaßquerschnitt sich aus dem Tastverhältnis der dem Zweiwicklungsdrehsteller zugeführten Impulsfolge als Stelleransteuerungssignal ergibt.In the preferred embodiment, the actuator is designed as a two-turn rotary actuator 19a, which controls a slide valve 19b connected as an air bypass parallel to the throttle valve for idle charge control, the desired passage cross section of which results from the pulse duty factor of the pulse train supplied to the two-winding rotary actuator as an actuator control signal.

Das Kraftstoffzumeßsystem für die Brennkraftmaschine ist hier lediglich stellvertretend für alle möglichen Formen als Vorstufe 20 (Steuermultivibratorstufe) für die Erzeugung sogenannter tp-Vorimpulse dargestellt, welcher Vorstufe von einem Eingangsblock 21 eine Luftmassen- oder Luftmengenangabe zugeführt wird, zusätzlich zum Drehzahlsignal n der Brennkraftmaschine. Die Vorstufe oder Steuermultivibratorstufe 20 arbeitet über eine zwischengeschaltete Verknüpfungsstufe 22 auf eine weitere Stufe der Kraftstoffeinspritzanlage, die als Multiplizierstufe bezeichnet werden kann ; allerdings gelangt auf die Verknüpfungsstufe 22 auch das Ausgangssignal der durch den Block 30 dargestellten Schubabschaltestufe, so daß die Vorimpulse tp dann unterdrückt werden, wenn die Schubabschaltestufe 30 den Betriebszustand Schub der Brennkraftmaschine erkennt. Entsprechende Eingangssignale (Temperatursignal {}M, Drehzahlsignal n und ein Leerlaufsignal LL (Drosselklappenstellungssignal)) werden von der Schubabschaltestufe ausgewertet. Die Erfindung setzt jetzt an dieser Stelle ein und erfaßt zunächst die Größe oder Amplitude des vom PID-Regler der Leerlauffüllungsregelung erzeugten Stelleransteuerungssignals r. Bei analoger Erzeugung dieses Signals kann dies sofort dem einen Eingang eines Vergleichers oder Komparators 40 zugeführt werden ; ist das Stelleransteuerungssignal r in seinem Tastverhältnis moduliert, dann kann ein einfacher Integrierblock 41 zwischengeschaltet werden, um eine analoge Größe zu gewinnen, wenn man darauf abstellt, daß die Erfindung auf analoger Basis arbeitet. Sinnvoll ist es allerdings bei ohnehin digital verarbeitenden Systemen, auch die die Erfindung darstellenden und in ihrer Funktion realisierenden Komponenten in Form digitaler Bausteine auszubilden oder unmittelbar in das Gesamtsystem der Leerlauffüllungsregelung und Schubabschaltung zu integrieren, indem entsprechende Anweisungen an die jeweiligen Rechner, Programmspeicher u. dgl. gegeben werden. Bevorzugt gilt dies für solche Einspritz-Steuergeräte, bei denen die Leerlauffüllungsregelung gleichzeitig als sog. integrierte LFR vorgesehen ist.The fuel metering system for the internal combustion engine is here merely representative of all possible forms as a preliminary stage 20 (control multivibrator stage) for the generation of so-called tp preliminary pulses, which preliminary stage is supplied with an air mass or air quantity specification from an input block 21, in addition to the speed signal n of the internal combustion engine. The preliminary stage or control multivibrator stage 20 operates via an intermediate link stage 22 to a further stage of the fuel injection system, which can be referred to as a multiplier stage; however, the output signal of the overrun cutoff stage represented by block 30 also reaches logic stage 22, so that the pre-pulses tp are suppressed when overrun cutoff stage 30 detects the operating state overrun of the internal combustion engine. Corresponding input signals (temperature signal {} M, speed signal n and an idle signal LL (throttle valve position signal)) are evaluated by the overrun cut-off stage. The invention now begins at this point and first detects the size or amplitude of the idle charge control from the PID controller generated actuator control signal r. If this signal is generated analogously, this can be fed immediately to the one input of a comparator or comparator 40; if the actuator control signal r is modulated in its duty cycle, then a simple integrating block 41 can be interposed in order to gain an analog value if it is assumed that the invention works on an analog basis. However, it makes sense in the case of digital processing systems anyway, to also design the components which represent the invention and implement their function in the form of digital modules, or to integrate them directly into the overall system of idle charge control and overrun fuel cutoff by corresponding instructions to the respective computers, program memories and the like. Like. Be given. This preferably applies to those injection control units in which the idle charge control is simultaneously provided as a so-called integrated LFR.

Das Stelleransteuerungssignal r wird mit einer geeigneten -τ-Schwelle verglichen, die von einem Block 42 erzeugt bzw. vorgegeben wird. Es hat sich als sinnvoll herausgestellt und ist daher eine bevorzugte Ausführungsform vorliegender Erfindung, die τ-Schwelle als Funktion der Motortemperatur ϑM auszubilden und so zu wählen, daß die sich mit demjeweiligen T ergebende Motordrehzahl auf jeden Fall kleiner ist als die Abschneidedrehzahl der Schubabschaltefunktion.The actuator control signal r is compared with a suitable -τ threshold, which is generated or specified by a block 42. It has proven to be useful and is therefore a preferred embodiment of the present invention to design the τ threshold as a function of the engine temperature ϑ M and to select it in such a way that the engine speed resulting from the respective T is in any case less than the cut-off speed of the overrun cutoff function.

Stellt daher der Vergleicher 40 fest, daß das effektive Stelleransteuerungssignal r größer als die vorgegebene τ-Schwelle ist, dann ergibt sich an diesem Vergleicher gleichzeitig auch die Information,. daß diese hierdurch bewirkte erhöhte Motordrehzahl effektiv auf eine sinnvolle Reaktion der Leerlauffüllungsregelung zurückzuführen ist, und der Vergleicher erzeugt dann an seinem Ausgang 40a ein Sperrsignal, welches einem Eingang 30a der Schubabschaltestufe 30 zugeführt wird und deren Funktion unter diesen Umständen (Stelleransteuerungssignal r größer als die vorgegebene r-Schwelle) sperrt, d. h. das Einsetzen der Schubabschaltefunktion insgesamt verbietet.Therefore, if the comparator 40 determines that the effective actuator control signal r is greater than the predetermined τ threshold, then the information also results from this comparator. that this resulting increased engine speed is effectively due to a sensible reaction of the idle charge control, and the comparator then generates a blocking signal at its output 40a, which is fed to an input 30a of the overrun cut-off stage 30 and whose function under these circumstances (actuator control signal r greater than the predetermined one) r threshold) blocks, d. H. prohibiting the use of the overrun cutoff function as a whole.

Die Erfindung ist daher in der Lage, die Funktionen der Leerlauffüllungsregelung von der Schubabschaltung sauber zu trennen, gegenseitige Einflüsse zu unterbinden und einen einwandfreien Ablauf in der Steuerung der Momentandrehzahl ohne Schwingungen im gleichmäßigen Übergang sicherzustellen.The invention is therefore able to cleanly separate the functions of the idle charge control from the overrun fuel cutoff, to prevent mutual influences and to ensure a faultless process in the control of the instantaneous speed without vibrations in the smooth transition.

Claims (6)

1. Method of regulating the rotational speed of an internal-combustion engine, in which method on the one hand a lower minimum speed is maintained by an idling speed control or idling filling control (LFR) by influencing the air supplied to the internal-combustion engine during idling by means of a final control element (19) controlled by a triggering signal generated by the idling control or idling filling control (LFR), increase and reduction of the air supply being produced by opposing changes of the triggering signal size (r), on the other hand when operating under overrun conditions of the motor vehicle the feul supply, is interrupted by overrun cutoff (SAS), characterized in that the triggering signal size (r) is compared with a predetermined (r) threshold value and, on reaching the threshold value, the overrun cutoff function (SAS) is inhibited.
2. Method according to Claim 1, characterized in that the τ threshold value itself is a function of the engine temperature and is chosen such that the engine speed produced by the respective (T) threshold value is always smaller than the cutoff speed of the overrun cutoff function.
3. Method according to Claim 1 or 2, characterized in that, due to the D component of the idling filling controller having PID action overall, the cutin speed of the overrun cutoff function is adjusted dynamically by virtue of the fact that, in the case of a quickly dropping speed (n) of the internal-combustion engine, the fuel supply is resumed at a higher cutin speed since the actuator triggering signal (τ) calculated by the PID controller of the idling filling control reaches the limit value of the threshold value at an earlier time.
4. Apparatus for implementation of the method according to Claims 1 to 3, with an idling speed control or idling filling control (LFR) for maintaining a lower minimum speed by means of a final control element (19) controlled by a triggering signal generated by the idling control or idling filling control (LFR) for influencing the air supply to the intemal-combustion engine during idling, increase and reduction of the air supply being produced by opposing changes of the triggering signal size (r), and means (30) which inhibit the fuel supply whenever the speed is above the idling speed and the intemal-combustion engine is at the same time operating under overrun conditions, characterized by means (42) which generate a threshold value, means (40) which compare the instantaneous actual value of the triggering signal size (r) with the (z) threshold value, and means via which an inhibiting signal is emitted to the means for inhibiting the fuel supply whenever the triggering signal size reaches the (τ) threshold value.
5. Apparatus according to Claim 4, characterized in that the controller of the idling filling control is a PID controller with a D component dimensioned in such a way that, in the case of a quick speed drop, the cutin spead of the overrun cutoff is increased dynamically to a higher cutin speed by the overrun cutoff circuit (30).
6. Apparatus according to one of Claims 4 to 5, characterized in that the (τ) threshold value is a function of the internal-combustion engine temperature (öM).
EP84113962A 1983-12-17 1984-11-19 Method and apparatus for regulating the rotational speed of a combustion engine Expired EP0147611B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3345711 1983-12-17
DE19833345711 DE3345711A1 (en) 1983-12-17 1983-12-17 METHOD AND DEVICE FOR SPEED CONTROL IN AN INTERNAL COMBUSTION ENGINE

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EP0147611A2 EP0147611A2 (en) 1985-07-10
EP0147611A3 EP0147611A3 (en) 1986-05-21
EP0147611B1 true EP0147611B1 (en) 1989-08-30

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EP (1) EP0147611B1 (en)
JP (1) JPS60128955A (en)
AU (1) AU570275B2 (en)
DE (2) DE3345711A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6128727A (en) * 1984-07-17 1986-02-08 Nippon Denso Co Ltd Engine speed control device for vehicular internal-combustion engine
DE3521551A1 (en) * 1985-06-15 1986-12-18 Robert Bosch Gmbh, 7000 Stuttgart METHOD FOR CONTROLLING AND / OR REGULATING OPERATING CHARACTERISTICS OF AN INTERNAL COMBUSTION ENGINE
US4787352A (en) * 1987-08-06 1988-11-29 Barber-Coleman Company Engine control circuit including speed monitor and governor
DE3828850A1 (en) * 1988-08-25 1990-03-08 Bosch Gmbh Robert DEVICE FOR CONTROLLING THE OPERATING CHARACTERISTICS OF AN INTERNAL COMBUSTION ENGINE
US4969332A (en) * 1989-01-27 1990-11-13 Allied-Signal, Inc. Controller for a three-wheel turbocharger
JP2792573B2 (en) * 1989-12-27 1998-09-03 ヤマハ発動機株式会社 Rotation control device for fuel injection type two-cycle engine
DE4215959C2 (en) * 1991-05-15 1997-01-16 Toyoda Automatic Loom Works Gain adjustment device for PID controllers
AUPQ700100A0 (en) * 2000-04-18 2000-05-11 Orbital Engine Company (Australia) Proprietary Limited Engine speed control for internal combustion engines

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US3868933A (en) * 1969-11-22 1975-03-04 Volkswagenwerk Ag Combustion motor
JPS5534295B2 (en) * 1972-10-05 1980-09-05
US4203395A (en) * 1977-09-16 1980-05-20 The Bendix Corporation Closed-loop idle speed control system for fuel-injected engines using pulse width modulation
JPS56107927A (en) * 1980-01-31 1981-08-27 Nissan Motor Co Ltd Fuel feeder
JPS5751918A (en) * 1980-09-16 1982-03-27 Toyota Motor Corp Control method of fuel injection in internal combustion engine
JPS5752650A (en) * 1980-09-17 1982-03-29 Toyota Motor Corp Fuel cut-off control method for internal combustion engine
JPS59190449A (en) * 1983-04-12 1984-10-29 Honda Motor Co Ltd Control method of internal-combustion engine

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EP0147611A3 (en) 1986-05-21
AU3486784A (en) 1985-06-20
JPS60128955A (en) 1985-07-10
EP0147611A2 (en) 1985-07-10
US4572125A (en) 1986-02-25
JPH0571785B2 (en) 1993-10-07
DE3345711A1 (en) 1985-06-27
DE3479599D1 (en) 1989-10-05
AU570275B2 (en) 1988-03-10

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