EP0089409A1 - Fuel cut-off control system in an internal-combustion engine - Google Patents

Fuel cut-off control system in an internal-combustion engine Download PDF

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Publication number
EP0089409A1
EP0089409A1 EP82110803A EP82110803A EP0089409A1 EP 0089409 A1 EP0089409 A1 EP 0089409A1 EP 82110803 A EP82110803 A EP 82110803A EP 82110803 A EP82110803 A EP 82110803A EP 0089409 A1 EP0089409 A1 EP 0089409A1
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EP
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Prior art keywords
combustion engine
internal combustion
speed
idle
fuel supply
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EP82110803A
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German (de)
French (fr)
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EP0089409B1 (en
Inventor
Harald Collonia
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Mannesmann VDO AG
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Mannesmann VDO AG
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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
    • F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
    • F02D31/001—Electric control of rotation speed
    • F02D31/002—Electric control of rotation speed controlling air supply
    • F02D31/003—Electric control of rotation speed controlling air supply for idle speed control
    • F02D31/005—Electric control of rotation speed controlling air supply for idle speed control by controlling a throttle by-pass
    • 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
    • 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
    • F02D2011/101—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 characterised by the means for actuating the throttles
    • F02D2011/102—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 characterised by the means for actuating the throttles at least one throttle being moved only by an electric actuator

Definitions

  • the invention relates to a device for switching off the fuel supply to an internal combustion engine, in particular with an injection pump in overrun mode of a motor vehicle, with a shut-off element controlled as a function of the drop in speed of the internal combustion engine, in particular a solenoid valve for switching the fuel supply off and on again.
  • the switch-on threshold is in any case higher than the idling speed, since, owing to the dead time behavior of the internal combustion engine, it generates power only some time after an ignitable mixture has been fed in. - The desired fuel saving is now greater, the lower the reclosing threshold, ie the closer the reclosing speed can be to the idling speed.
  • the difference between the idling speed and the reclosing threshold to be observed in the known devices for overrun switching is smaller, the slower the speed drops in overrun mode.
  • a so-called adaptive overrun cutoff is part of the prior art, which takes into account the speed of the speed drop. This can be achieved by a differential component of the time behavior in a transmission element between the speed sensor and the actuator, which switches the fuel on and off.
  • This timing element must be matched to the characteristics of the internal combustion engine, on the one hand to achieve an optimal reduction of the restart threshold depending on the speed of the drop in speed, but on the other hand to ensure that a safety margin remains even when the tolerance limits of the restart speed and idling speed are unfavorable, i.e. that Idle speed is never undercut. -
  • This facility is relatively complex, in particular because of the differentiating timing element and its setting. Nevertheless, unnecessary fuel is still consumed since the facility in any case switches on the fuel supply again at a speed at a safety distance from the idling speed.
  • idle regulators which actuate an electromagnetic actuator when the accelerator pedal is not actuated in order to actuate a slide in a control slot of a bypass to a throttle valve.
  • This idle controller ensures that a predetermined, as low as possible idle speed, at which the internal combustion engine is still running smoothly ("round"), is kept independent of flow variables such as temperatures of the internal combustion engine and the intake air.
  • These known idle speed controllers are constructed as PID controllers with proportional integral and differential time components for optimal control of the internal combustion engine, taking into account the dynamic behavior. The proportions of the time behavior must be matched to the dynamic behavior of the internal combustion engine. -
  • the idle controller saves fuel in idle mode, especially in the city cycle. However, it does not completely switch off the fuel supply if the speed of the internal combustion engine falls below a predetermined switch-off speed.
  • the object of the present invention is to further improve a device for switching off the fuel supply to an internal combustion engine in such a way that, when the effort for the switch-off device is reduced, the fuel saving is improved by taking advantage of the distance between the restart speed and the idling speed the interception behavior of the idle controller is minimized.
  • complex adjustment work should be carried out when the device is tuned to the dynamic behavior of the internal combustion engine be saved.
  • the idle controller is therefore used in an astonishingly simple manner at the same time for thrust shutdown, in that a second output of the idle controller is connected to the shut-off element (solenoid valve) which switches the fuel supply on or off, while a first output of the idle controller is connected in a conventional manner to a slide in a control slot the bypass is connected to a throttle valve.
  • the fuel cut-off is adapted in a surprisingly simple manner to the dynamic behavior of the internal combustion engine. It has been found that the same timing behavior of the internal combustion engine as the controlled system can be assumed for both the overrun cutoff and the speed control, although the manipulated variables intervene at different points.
  • idle speed controllers which, according to claim 2, have a PID behavior: and which, according to claim 3, control the flow in a bypass to the throttle valve in a conventional manner.
  • the idle controller has a setpoint generator 10 which can be switched over by an idle contract 9 for the reference variable w of the speed.
  • the reference variable is compared at a comparison point 11 with a control variable x output by a speed sensor 12, and the control deviation x w is formed.
  • the idle contract is connected to the mixer or the accelerator pedal to indicate the idle position. It switches the command variable in the usual way depending on whether the accelerator pedal is operated or not.
  • the signal flow continues to an amplifier with a timing element 13, which has PID behavior.
  • the timing element is customarily adapted to the dynamic behavior of the internal combustion engine that is to be regulated.
  • a second output of the regulator is connected via a line 14 to a solenoid valve 15 which is switched into a fuel line 16.
  • the idle controller used in the circuit arrangement works in a conventional manner.
  • the idle controller 1 is also effective for overrun fuel cutoff by actuating the solenoid valve 15.
  • the fuel supply is automatically switched on by the idle controller whenever it changes the slide in the control slot in the usual way to increase the idle speed. This happens as a result of the differential component of the timing element in the event of a drop in the speed of the position when the speed falls below a relatively high threshold, while the fuel supply remains switched off until the idling speed is reached when the coasting speed is slow.
  • an adaptive overrun cutoff is also effected at the same time, the switching thresholds of which have optimally moved towards those of the idle control, since they correspond to these while avoiding an otherwise required safety distance.

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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)

Abstract

Eine Einrichtung zur Abschaltung der Kraftstoffzufuhr zu einem Verbrennungsmotor mit Einspritzpumpe im Schubbetrieb eines Kraftfahrzeugs umfasst ein in Abhängigkeit von dem Drehzahlabfall des Verbrennungsmotors gesteuertes Magnetventil zum Ab- und Wiedereinschalten der Kraftstoffzufuhr. Um die Abschaltschwelle und Wiedereinschaltschwelle der Kraftstoffzufuhr mit geringem Aufwand und trotzdem grosser Kraftstoffersparnis an die Charakteristik des Verbrennungsmotors anzupassen, ist das Magnetventil mit einem Ausgang eines für den gleichen Verbrennungsmotor vorgesehenen Leerlaufreglers verbunden, nessen Zeitverhalten zumindest einen Differentialanteil neben dem Proportionalanteil, möglichst aber einen Proportional-, Integral- und Differentialanteil aufweist. Die Abstimmung der Zeitanteile an das dynamische Verhalten des Verbrennungsmotors ist dabei die gleiche wie für die Leerlaufdrehzahlregelung.A device for switching off the fuel supply to an internal combustion engine with an injection pump in overrun mode of a motor vehicle comprises a solenoid valve which is controlled as a function of the drop in speed of the internal combustion engine and is used to switch the fuel supply off and on again. In order to adapt the switch-off threshold and switch-on threshold of the fuel supply to the characteristics of the internal combustion engine with little effort and nevertheless great fuel savings, the solenoid valve is connected to an output of an idle controller provided for the same internal combustion engine. , Integral and differential component. The coordination of the time components to the dynamic behavior of the internal combustion engine is the same as for idle speed control.

Description

Die Erfindung betrifft eine Einrichtung zur Abschaltung der Kraftstoffzufuhr zu einem Verbrennungsmotor insbesondere mit Einspritzpumpe im Schubbetrieb eines Kraftfahrzeugs, mit einem in Abhängigkeit von dem Drehzahlabfall des Verbrennungs motors gesteuerten Abschaltorgan, insbesondere Magnetventil zum Ab- und Wiedereinschalten der Kraftstoffzufuhr.The invention relates to a device for switching off the fuel supply to an internal combustion engine, in particular with an injection pump in overrun mode of a motor vehicle, with a shut-off element controlled as a function of the drop in speed of the internal combustion engine, in particular a solenoid valve for switching the fuel supply off and on again.

Derartige bekannte Einrichtungen stellen die Kraftstoffzufuhr zu einem Verbrennungsmotor ab, wenn ein in Abhängigkeit von dem Fahrpedal (Gaspedal) gesteuerter Leerlaufkontakl bei schiebendem Fahrzeug betätigt ist und dabei die Drehzahl des Motors eine vorgegebene Schwelle überschreitet. Dadurch wird eine Kraftstoffeinsparung erzielt, da der Verbrennungsmotor bei schiebendem Fahrzeug keine Arbeit zu erzeugen hat, sondern eher ein Bremsmoment auf das Fahrzeug ausüben soll.Known devices of this type shut off the fuel supply to an internal combustion engine when an idle contact controlled as a function of the accelerator pedal (accelerator pedal) is actuated when the vehicle is pushing and the speed of the engine exceeds a predetermined threshold. This results in fuel savings since the internal combustion engine does not have to produce any work when the vehicle is pushing, but rather is supposed to exert a braking torque on the vehicle.

Bei einer niedrigeren Drehzahl als die voranstehend genannte Abschaltschwelle liegt eine Wiedereinschaltschwelle. Bei Unterschreiten der Wiedereinschaltsohwelle wird der Verbrennungsmotor erneut mit Kraftstoff versorgt, um zu vermeiden, daß der Motor wegen mangeldem zündfähigen Gemisch bei weiterem Drehzahlabfall bis unterhalb der Leerlaufdrehzahl abstirbt. Die.Wiedereinschaltschwelle liegt in jedem Fall höher als die Leerlaufdrehzahl, da infolge des Totzeit-Verhaltens der Verbrennungsmaschine diese erst einige Zeit nach Einspeisung eines zündfähigem Gemischs Leistung erzeugt. - Die erwünschte Kraftstoffersparnis ist nun um so größer,je niedriger die Wiedereinschaltschwelle liegt, d.h. je dichter die Wiedereinschalt-Drehzahl an die Leerlaufdrehzahl herangerückt werden kann.If the speed is lower than the switch-off threshold mentioned above, there is a switch-on threshold. If the switch-on threshold is undershot, the internal combustion engine is again supplied with fuel in order to avoid that the engine stalls due to a lack of an ignitable mixture if the engine speed drops further to below idle speed. The switch-on threshold is in any case higher than the idling speed, since, owing to the dead time behavior of the internal combustion engine, it generates power only some time after an ignitable mixture has been fed in. - The desired fuel saving is now greater, the lower the reclosing threshold, ie the closer the reclosing speed can be to the idling speed.

Die Differenz zwischen der Leerlaufdrehzahl und der bei den bekannten Einrichtungen zur Schubschaltung einzuhaltenden Wiedereinschaltschwelle ist um so geringer, je langsamer die Drehzahl im Schubbetrieb abfällt. Um die Wiedereinschalt-Drehzahl in zulässiger Weise möglichst dicht an die Leerlaufdrehzahlleranzurücken, gehört eine sogenannte adaptive Schubabschaltung zum Stand der Technik, welche die Geschwindigkeit des Drehzahlabfalls berücksichtigt. Dies kann durch einen Differentialanteil des Zeitverhaltens in einem Übertragungsglied zwischen dem Drehzahlgeber und dem Stellglied verwirklicht werden, welches den Kraftstoff zu-und abschaltet. Dieses Zeitglied muß auf die Charakteristik des Verbrennungsmotors abgestimmt werden, um einerseits eine optimale Herabsetzung der Wiedereinschaltschwelle in Abhängigkeit von der Geschwindigkeit des Drehzahlabfalls zu erreichen, andererseits aber sicherzustellen, daß auch bei ungünstigen Toleranzgrenzen von Wiedereinschalt-Drehzahl und Leerlaufdrehzahl ein Sicherheitsabstand bestehen bleibt, d. h. die Leerlaufdrehzahl in keinem Fall unterschritten wird. - Diese Einrichtung ist insbesondere wegen des differenzierenden Zeitglieds und dessen Einstellung verhältnismäßig aufwendig. Trotzdem wird noch überflüssiger Kraftstoff verbraucht, da die Einrichtung in jedem Fall bei einer Drehzahl in einem Sicherheitsabstand zu der Leerlaufdrehzahl die Kraftstoffzufuhr wieder einschaltet.The difference between the idling speed and the reclosing threshold to be observed in the known devices for overrun switching is smaller, the slower the speed drops in overrun mode. In order to move the restart speed as close as possible to the idling speed, a so-called adaptive overrun cutoff is part of the prior art, which takes into account the speed of the speed drop. This can be achieved by a differential component of the time behavior in a transmission element between the speed sensor and the actuator, which switches the fuel on and off. This timing element must be matched to the characteristics of the internal combustion engine, on the one hand to achieve an optimal reduction of the restart threshold depending on the speed of the drop in speed, but on the other hand to ensure that a safety margin remains even when the tolerance limits of the restart speed and idling speed are unfavorable, i.e. that Idle speed is never undercut. - This facility is relatively complex, in particular because of the differentiating timing element and its setting. Nevertheless, unnecessary fuel is still consumed since the facility in any case switches on the fuel supply again at a speed at a safety distance from the idling speed.

Zur Kraftstoffeinsparung sind weiterhin Leerlaufregler bekannt, die bei nicht betätigtem Fahrpedal ein elektromagnetisches Stellglied betätigen, um einen Schieber in einem Steuerschlitz eines Bypasses zu einer Drosselklappe zu betätigen. Dieser Leerlaufregler bewirkt, daß eine vorgegebene, möglichst niedrige Leerlaufdrehzahl, bei der die Verbrennungsmaschine noch gleichmäßig ("rund") läuft, unabhängig von Strögrößen wie Temperaturen des Verbrennungsmotors und der Ansaugluft gehalten wird. Diese bekannten Leerlaufregler sind zur optimalen Regelung des Verbrennungsmotors unter Berücksichtigung des dynamischen Verhaltens als PID-Regler mit proportionalen integralen und differentialen Zeitanteil aufgebaut. Die Anteile des Zeitverhaltens müssen dabei auf das dynamische Verhalten des Verbrennungsmotors abgestimmt werden. - Der Leerlaufregler bewirkt eine Kraftstoffersparnis im Leerlaufbetrieb, also insbesondere im Stadtzzyklus. Er bewirkt aber keine gänzliche Abschaltung der Kraftstoffzufuhr, wenn die Drehzahl des Verbrennungsmotors unter eine vorgegebene Abschalt-Drehzahl fällt.To save fuel, idle regulators are also known which actuate an electromagnetic actuator when the accelerator pedal is not actuated in order to actuate a slide in a control slot of a bypass to a throttle valve. This idle controller ensures that a predetermined, as low as possible idle speed, at which the internal combustion engine is still running smoothly ("round"), is kept independent of flow variables such as temperatures of the internal combustion engine and the intake air. These known idle speed controllers are constructed as PID controllers with proportional integral and differential time components for optimal control of the internal combustion engine, taking into account the dynamic behavior. The proportions of the time behavior must be matched to the dynamic behavior of the internal combustion engine. - The idle controller saves fuel in idle mode, especially in the city cycle. However, it does not completely switch off the fuel supply if the speed of the internal combustion engine falls below a predetermined switch-off speed.

Zu der vorliegenden Erfindung ehört die Aufgabe, eine Einrichtung zur Abschaltung der Kraftstoffzufuhr zu einem Verbrennungsmotor derart weiter zu verbessern, daß bei Herabsetzung des Aufwands für die Abschaltungseinrichung die Kraftstoffersparnis verbessert wird, indem der Abstand zwischen der Wiedereinschalt-Drehzahl und der Leerlauf-Drehzahl durch Ausnutzen des Abfangverhaltens des Leerlaufreglers minimiert wird. Darüber hinaus sollen aufwendige Einstellarbeiten bei einer Abstimmung der Einrichtung auf das dynamische Verhalten des Verbrennungsmotors eingespart werden.The object of the present invention is to further improve a device for switching off the fuel supply to an internal combustion engine in such a way that, when the effort for the switch-off device is reduced, the fuel saving is improved by taking advantage of the distance between the restart speed and the idling speed the interception behavior of the idle controller is minimized. In addition, complex adjustment work should be carried out when the device is tuned to the dynamic behavior of the internal combustion engine be saved.

Diese Aufgabe wird durch die in dem kennzeichnenden Teil des Anspruchs 1 angegebene Erfindung gelöst.This object is achieved by the invention specified in the characterizing part of claim 1.

Erfindungsgemäß wird also in verblüffend einfacher Weise der Leerlaufregler zugleich zur Schubabschltung eingesetzt, indem ein zweiter Ausgang des Leerlaufreglers mit dem die Kraftstoffzufuhr ein- oder ausschaltenden Abschaltorgan (Magnetventil) verbunden ist, während ein erster Ausgang des Leerlaufreglers in üblicher Weise mit einem Schieber in einem Steuerschlitz des Bypasses zu einer Drosselklappe verbunden ist. Durch Verwendung eines Leerlaufreglers mit einem Differentialanteil des Zeitverhaltens wird zugleich in überraschend einfacher Weise die Schubabschaltung an das dynamische Verhalten des Verbrennungsmotors angepaßt. Es hat sich nämlich herausgestellt, daß sowohl für die Schubabschaltung als auvh für die Drehzahlregelung von dem gleichen Zeitverhalten des Verbrennungsmotors als Regelstrecke ausgegangen werden kann, obwohl die Stellgrößen an verschiedenen Stellen eingreifen.According to the invention, the idle controller is therefore used in an astonishingly simple manner at the same time for thrust shutdown, in that a second output of the idle controller is connected to the shut-off element (solenoid valve) which switches the fuel supply on or off, while a first output of the idle controller is connected in a conventional manner to a slide in a control slot the bypass is connected to a throttle valve. By using an idle controller with a differential component of the time behavior, the fuel cut-off is adapted in a surprisingly simple manner to the dynamic behavior of the internal combustion engine. It has been found that the same timing behavior of the internal combustion engine as the controlled system can be assumed for both the overrun cutoff and the speed control, although the manipulated variables intervene at different points.

Besonders vorteilhaft ist bei der erfindungsgemäßen Einrichtung, abgesehen von dem geringen Zusatzaufwand für die Schubabschaltung, wenn für ein Kraftfahrzeug eine Leerlaufregelung vorgesehen ist und von der Einsparung einer gesonderten Einjustierung der Schubabschaltung, daß zwischen dem Regelbereich der Schubabschaltung und dem Regelbereich der Leerlaufdrehzahl kein Toleranzabstand oder Toleranzband der Drehzahl eingehalten werden muß. Die Kraftstoffersparnis läßt sich dadurch optimieren.It is particularly advantageous in the device according to the invention, apart from the low additional effort for the overrun cut-off, if an idle control is provided for a motor vehicle and the saving of a separate adjustment of the overrun cut-off, that between the control range of the overrun cut-off and the control range of the idle speed there is no tolerance distance or tolerance band the speed must be maintained. This can optimize fuel savings.

In besonders vorteilhafter Weise werden Leerlaufdrehzahl-Regler eingesetzt, die nach Anspruch 2 ein PID-Verhalte: aufweisen und die nach Anspruch 3 in konventioneller Weise den Durchfluß in einem Bypaß zu der Drosselklappe steuern.In a particularly advantageous manner, idle speed controllers are used which, according to claim 2, have a PID behavior: and which, according to claim 3, control the flow in a bypass to the throttle valve in a conventional manner.

Ein Ausführungsbeispiel der erfindungsgemäßen Einrichtung zur Abschaltung der Kraftstoffzufuhr in Kombination mit einem Leerlaufdrehzahl-Regler wird im folgenden anhand eines vereinfachten Blockschaltbilds beschrieben:

  • In der Zeichnung ist allgemein mit 1 ein Leerlaufregler bezeichnet, dessen erster Ausgang über eine Leitung 2 mit einem elektromagnetischem Stellglied 3 in Verbindung steht. Das elektromagnetische Stellglied verstellt einen Schieber 4 in einem Steuerschlitz 5 eines Bypasses 6, der eine Drosselklappe 7 in einem Ansaugrohr 8 überbrückt.
An exemplary embodiment of the device according to the invention for switching off the fuel supply in combination with an idle speed controller is described below using a simplified block diagram:
  • In the drawing, 1 denotes an idle controller, the first output of which is connected to an electromagnetic actuator 3 via a line 2. The electromagnetic actuator adjusts a slide 4 in a control slot 5 of a bypass 6, which bridges a throttle valve 7 in an intake pipe 8.

Der Leerlaufregler weist einen durch einen Leerlaufkontrakt 9 umschaltbaren Sollwertgeber 10 für die Führungsgröße w der Drehzahl auf. Die Führungsgröße wird an einer Vergleichsstelle 11 mit einer von einem Drehzahlgeber 12 abgegebenen Regelgröße x verglichen, und es wird die Regelabweichung xw gebildet. Der Leerlaufkontrakt steht mit dem Gemischerzeuger, bzw. dem Fahrpedal in Verbindung, um die Leerlaufstellung anzuzeigen. Er schaltet die Führungsgröße in üblicher Weise in Abhängigkeit davon um, ob das Fahrpedal betätigt wird oder nicht.The idle controller has a setpoint generator 10 which can be switched over by an idle contract 9 for the reference variable w of the speed. The reference variable is compared at a comparison point 11 with a control variable x output by a speed sensor 12, and the control deviation x w is formed. The idle contract is connected to the mixer or the accelerator pedal to indicate the idle position. It switches the command variable in the usual way depending on whether the accelerator pedal is operated or not.

Von der Vergleichstelle 11 führt der Signalfluß weiter zu einem Verstärker mit Zeitglied 13, welches PID-Verhalte aufweist. Das Zeitglied ist an das dynamische Verhalten der Verbrennungsmaschine in üblicher Weise angepaßt, die geregelt werden soll.From the comparison point 11, the signal flow continues to an amplifier with a timing element 13, which has PID behavior. The timing element is customarily adapted to the dynamic behavior of the internal combustion engine that is to be regulated.

Ein zweiter Ausgang des Reglers ist über eine Leitung 14 mit einem Magnetventil 15 verbunden, welches in eine Kraftstoffleitung 16 eingeschaltet ist.A second output of the regulator is connected via a line 14 to a solenoid valve 15 which is switched into a fuel line 16.

Der in der Schaltungsanordnung verwendete Leerlaufregler arbeitet in konventioneller Weise. Gleichzeitig wird der Leerlaufregler 1 aber auch zur Schubabschaltung durch Betätigung des Magnetventils 15 wirksam. Durch den Leerlaufregler wird die Kraftstoffzufuhr jedesmal dann selbsttätig eingeschaltet, wenn er in sonst üblicher Weise den Schieber in dem Steuerschlitz zur Erhöhung der Leerlaufdrehzahl verändert. Dies geschieht infolge des Differentialanteils des Zeitglieds bei Stellendrehzahlabfall bereits bei Unterschreiten einer verhältnismäßig hohen Drehzahlschwelle,während bei langsamen Ausrollen die Kraftstoffzufuhr bis zum Erreichen der Leerlaufdrehzahl abgestellt bleibt.The idle controller used in the circuit arrangement works in a conventional manner. At the same time, the idle controller 1 is also effective for overrun fuel cutoff by actuating the solenoid valve 15. The fuel supply is automatically switched on by the idle controller whenever it changes the slide in the control slot in the usual way to increase the idle speed. This happens as a result of the differential component of the timing element in the event of a drop in the speed of the position when the speed falls below a relatively high threshold, while the fuel supply remains switched off until the idling speed is reached when the coasting speed is slow.

Durch die Verwendung eines üblichen Leerlaufreglers wird also zugleich eine adaptive Schubabschaltung bewirkt, deren Schaltschwellen optimal an diejenigen der Leerlaufregelung herangerückt sind, da sie mit diesen unter Vermeidung eines sonst erforderlichen Sicherheitsabstands übereinstimmen.By using a conventional idle controller, an adaptive overrun cutoff is also effected at the same time, the switching thresholds of which have optimally moved towards those of the idle control, since they correspond to these while avoiding an otherwise required safety distance.

Claims (3)

1. Einrichtung zur Abschaltung der Kraftstoffzufuhr zu einem Verbrennungsmotor insbesondere mit Einspritzpumpe im Schubbetrieb eines Kraftfahrzeugs, mit einem in Abhängigkeit von dem Drehzahlabfall des Verbrennungsmotors gesteuerten Abschaltorgan, insbesondere Magnetventil, zum Ab- und Wiedereinschalten der Kraftsoffzufuhr,
dadurch gekennzeichnet,
daß das Magnetventil (15) mit einem Ausgang (Leitung 14) eines Leerlaufreglers (1) verbunden ist, dessen Zeitverhalten einen Differentialanteil aufweist.1. Device for switching off the fuel supply to an internal combustion engine, in particular with an injection pump in the overrun mode of a motor vehicle, with a shut-off element controlled in dependence on the drop in speed of the internal combustion engine, in particular a solenoid valve, for switching the fuel supply off and on again,
characterized,
that the solenoid valve (15) is connected to an output (line 14) of an idle controller (1), the timing of which has a differential component. 2. Einrichtung nach Anspruch 1,
gekennzeichnet durch
die Verwendung eines auf die Charakteristik des Verbrennungsmotors abgestimmten Leerlaufreglers (1) mit Proportional-, Integral- und Differentialanteil (Zeitglied 13) seines Zeitverhaltens.2. Device according to claim 1,
marked by
the use of an idle controller (1) matched to the characteristics of the internal combustion engine with a proportional, integral and differential component (timing element 13) of its timing behavior. 3. Einrichtung nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß an den Ausgang (Leitung 2) des Leerlaufreglers ein elektromagnetisches Stellglied (3) verbunden ist, welches einen Schieber (4) in einem Steuerschlitz (5) eines Bypasses (6) zu einer Drosselklappe (7) verstellt.3. Device according to claim 1 or 2,
characterized,
that an electromagnetic actuator (3) is connected to the output (line 2) of the idle controller, which adjusts a slide (4) in a control slot (5) of a bypass (6) to a throttle valve (7).
EP82110803A 1982-03-18 1982-11-23 Fuel cut-off control system in an internal-combustion engine Expired EP0089409B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3209839 1982-03-18
DE3209839 1982-03-18

Publications (2)

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EP0089409A1 true EP0089409A1 (en) 1983-09-28
EP0089409B1 EP0089409B1 (en) 1989-03-29

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ID=6158574

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82110803A Expired EP0089409B1 (en) 1982-03-18 1982-11-23 Fuel cut-off control system in an internal-combustion engine

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US (1) US4619230A (en)
EP (1) EP0089409B1 (en)

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NL8801092A (en) * 1987-04-29 1988-11-16 Suzuki Motor Co DEVICE FOR CONTROLLING A CARBURATOR FOR COMBUSTION ENGINE.
DE3825538A1 (en) * 1987-07-28 1989-02-09 Fuji Heavy Ind Ltd SYSTEM FOR REGULATING THE FUEL DELIVERY FOR A MOTOR VEHICLE ENGINE
WO1990002258A1 (en) * 1988-08-25 1990-03-08 Robert Bosch Gmbh Device for regulating an operating parameter of an internal combustion engine
EP0240409B1 (en) * 1986-04-02 1990-06-06 Regie Nationale Des Usines Renault Method to resume the fuel supply of an internal combustion engine after fuel cut-off due to deceleration

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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
CH671609A5 (en) * 1985-06-24 1989-09-15 Mitsui Shipbuilding Eng DEVICE FOR PREVENTING EXCESSIVE FLOW OF GASEOUS FUEL THROUGH AN INJECTION NOZZLE OF A DIESEL ENGINE.
JPS63253147A (en) * 1987-04-09 1988-10-20 Nissan Motor Co Ltd Idling engine speed control device for internal combustion engine
DE3869475D1 (en) * 1987-06-02 1992-04-30 Siemens Ag METHOD FOR DETERMINING MOTION VECTOR FIELDS FROM DIGITAL IMAGE SEQUENCES.
DE3832517C2 (en) * 1988-09-24 2001-03-08 Vdo Luftfahrtgeraete Werk Gmbh System for the electrical transmission of an angular position
US5371670A (en) * 1993-02-01 1994-12-06 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Three-parameter tunable tilt-integral-derivative (TID) controller
DE59608240D1 (en) * 1995-08-04 2002-01-03 Jenbacher Ag Jenbach Device for regulating an engine size, in particular the power or the speed of an internal combustion engine
US6474297B1 (en) * 2001-05-31 2002-11-05 Lai Ming De Fuel breaking/saving device for cars during coasting

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EP0240409B1 (en) * 1986-04-02 1990-06-06 Regie Nationale Des Usines Renault Method to resume the fuel supply of an internal combustion engine after fuel cut-off due to deceleration
NL8801092A (en) * 1987-04-29 1988-11-16 Suzuki Motor Co DEVICE FOR CONTROLLING A CARBURATOR FOR COMBUSTION ENGINE.
DE3825538A1 (en) * 1987-07-28 1989-02-09 Fuji Heavy Ind Ltd SYSTEM FOR REGULATING THE FUEL DELIVERY FOR A MOTOR VEHICLE ENGINE
WO1990002258A1 (en) * 1988-08-25 1990-03-08 Robert Bosch Gmbh Device for regulating an operating parameter of an internal combustion engine
US5048482A (en) * 1988-08-25 1991-09-17 Robert Bosch Gmbh Device for controlling an operating characteristic of an internal combustion engine

Also Published As

Publication number Publication date
US4619230A (en) 1986-10-28
EP0089409B1 (en) 1989-03-29

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