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EP0494337A2 - Method for controlling a throttle valve operated internal combustion engine in the idling range - Google Patents

Method for controlling a throttle valve operated internal combustion engine in the idling range Download PDF

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Publication number
EP0494337A2
EP0494337A2 EP91112926A EP91112926A EP0494337A2 EP 0494337 A2 EP0494337 A2 EP 0494337A2 EP 91112926 A EP91112926 A EP 91112926A EP 91112926 A EP91112926 A EP 91112926A EP 0494337 A2 EP0494337 A2 EP 0494337A2
Authority
EP
European Patent Office
Prior art keywords
throttle valve
accelerator pedal
actuator
actuating element
control element
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Withdrawn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
EP91112926A
Other languages
German (de)
French (fr)
Other versions
EP0494337A3 (en
Inventor
Frank Göhring
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mannesmann VDO AG
Original Assignee
Mannesmann VDO AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mannesmann VDO AG filed Critical Mannesmann VDO AG
Publication of EP0494337A2 publication Critical patent/EP0494337A2/en
Publication of EP0494337A3 publication Critical patent/EP0494337A3/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • 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
    • 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
    • F02D2011/103—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 alternatively mechanically linked to the pedal or moved by an electric actuator

Definitions

  • the invention relates to a method for operating a throttle valve-controlled internal combustion engine in the idle control range, the throttle valve being biased in the regulating direction, and an actuating element that can be actuated in the full-load direction on the accelerator pedal side and can be preloaded in the regulating direction against an idling stop in a position LL min in the regulating direction in the movement path of an actuating element for the throttle valve engages, as well as an actuating element which is controllable by means of an electromotive actuator in the idle control area and is biased in the regulating direction in the regulating direction engages in the movement path of the actuating element for the throttle valve.
  • an idle path In idle control systems, in which the idle air volume is controlled by electromotive adjustment of the throttle valve angle, an idle path must first be overcome when the accelerator pedal is actuated from the starting position LL min before the throttle valve-side adjusting element is acted upon by the accelerator pedal-side actuating element, which in turn is actuated by a Bowden cable or a pulley is taken. If the controller of the idle control system detects that the driver is actuating the accelerator pedal, for example by switching an idle contact assigned to the position LL min , the throttle valve is held in its current position by an electric motor until the throttle valve-side control element is carried along by the accelerator pedal-side control element. The length of the free travel therefore depends on the current working point. Particularly when the internal combustion engine is cold or a load is switched on, for example an air conditioning system, the then relatively long free travel between the LL min position of the actuating element on the accelerator pedal and the working point is perceived as unpleasant.
  • the object is achieved in that when the accelerator pedal-side control element is actuated during its regulation by means of the accelerator pedal, the actuator-side control element is regulated by an electric motor from the idling position assumed, the opening characteristic of the actuator-side control element being designed such that it is at a continuously decreasing distance in front of the Accelerator pedal-side control element runs, the distance between the accelerator pedal-side control element and the throttle valve-side control element becoming zero at the latest in position LL max .
  • the throttle valve when the accelerator pedal is actuated, the throttle valve does not remain in its current position, but is actuated by an electric motor in the upward direction, the upward speed of the actuating element on the actuator side being lower than that of the accelerator pedal-side actuator.
  • the relative speed of the accelerator pedal-side and actuator-side actuating element is dimensioned such that the accelerator pedal-side actuating element comes into contact with the throttle valve-side actuating element within the control range of the actuator-side actuating element and the throttle valve is thus moved via the accelerator pedal. With this control, the throttle valve angle is thus continuously adjusted so that the driver cannot feel any control jump caused by an idle travel.
  • the actuator-side and the accelerator-side actuator reach the position LL max essentially simultaneously.
  • the entire control range of the electromotive actuator is thus used to bring the accelerator pedal-side actuator closer to the actuator-side actuator.
  • the actuator-side actuator advantageously has a progressive movement relative to that of the accelerator-pedal actuator. This ensures a significantly improved control in the area of small throttle valve angles.
  • a potentiometer which detects the position of the accelerator pedal-side control element expediently supplies a setpoint specification for an electronic component, which generates a setpoint value for a position controller of the electromotive actuator.
  • the throttle valve can be opened with a characteristic curve dependent on the operating point.
  • the numeral 1 designates a load adjustment device which can be controlled externally via an accelerator pedal 2 and electronics 3.
  • the load adjustment device 1 includes a throttle valve 4, which is adjustable via an actuator 5 on the throttle valve side.
  • a tension spring 6 engages the dros Sel flap-side actuating element 5 and on a stationary component of the load adjusting device 1 and prestresses the throttle valve-side actuating element 5 in the idling direction.
  • the throttle valve 4 can be regulated between a minimum idle position LL min and a full load position VL.
  • the accelerator pedal 2 interacts via a Bowden cable 7 with an actuating element 8 on the accelerator pedal side, which is movable by means of the accelerator pedal 2 between a stop LL min and a stop VL.
  • a tension spring 9 engages the accelerator pedal-side control element 8 and a stationary component of the load adjustment device 1 and prestresses the accelerator pedal-side control element 8 against the stop LL min in the idling direction.
  • the position of the accelerator pedal-side control element 8 is detected by an actual value detection element 10, which is designed, for example, as a potentiometer and is arranged on the accelerator pedal-side control element 8, which is designed as a rope pulley.
  • the accelerator pedal-side actuating element 8 engages in the opening direction in the movement path of the throttle valve-side actuating element 5.
  • an actuating element 11 on the actuator side engages in the regulating direction in the movement path of the actuating element 5 on the throttle valve side.
  • the actuating element 11 on the actuator side can be moved between an LL min stop and an LL max stop by means of an electromotive actuator 12.
  • the position of the actuator element 11 on the actuator side is detected via a further actual value detection element 13, which can again be designed as a potentiometer, for example.
  • a tension spring 14 engages the actuator-side actuating element 11 and a stationary component of the load adjustment device 1 and prestresses the actuator-side actuating element 11 in the regulating direction against the stop LL min .
  • the device described so far for adjusting the load of an internal combustion engine is controlled in the idle control range via the electromotive actuator 12 and in part-load as well as full-load operation via the accelerator pedal 2.
  • the accelerator-side actuating element 8 assumes the stop position LL min shown, while the throttle valve 4 is, depending on the control via the electromotive actuator 12, which in turn is controlled by the electronics 3, at a working point which, in the example according to FIG. 1, lies approximately in the middle between the operating positions LL min and LL max .
  • This operating point can of course vary, it depends, for example, on the operating temperature of the internal combustion engine and the consumers (for example rear window heating, air conditioning system) which have to be supplied by the internal combustion engine and thus cause a specific, changing air requirement of the internal combustion engine.
  • FIG. 1 illustrates the initial situation for the operating position shown in Figure 1.
  • the throttle valve (DK) angle is plotted over the pedal travel.
  • the operating point A of the throttle valve is approximately halfway between the operating positions LL m in and LL max . If, starting from this working point A, the throttle valve 4 is only to be controlled via the accelerator pedal 2, the free travel between the throttle valve-side actuating element 5 and the accelerator pedal-side actuating element 8, which is designated by the path B 1 in FIG.
  • FIG. 2 illustrates that curve C proceeds progressively from working point A and intersects straight line B 2 approximately at operating point LL max .
  • the accelerator pedal-side actuating element 8 lagging the movement of the actuator-side actuating element 11 has thus caught up with the actuator-side actuating element 11 at the end of its control range and from then on, that is to say in the part-load and full-load range, can take over the control of the throttle valve 4 by the accelerator pedal 2.
  • FIG. 2 also illustrates a possible course of control of the throttle valve at an operating point A ′ of the throttle valve 4 that is closer to the operating position LL min .
  • a smaller free travel Bi ' would have to be bridged by the accelerator pedal-side actuating element 8 before the actuating element 5 on the throttle valve side was acted upon in the region of the straight line B 2 '.
  • the throttle valve 4 is regulated via the electromotive actuator 12 along the steeper curve C' which intersects the straight line B 2 'before the operating point LL max det.
  • the alternative is intended to clarify that the accelerator pedal-side control element 8 can take over the control of the throttle valve 4 even before the control range end of the electromotive actuator 12 is reached.
  • the potentiometer 10 detecting the position of the accelerator pedal-side control element 8 provides a setpoint specification for an electronic component which is fundamentally integrated in the electronics 3 .
  • This electronic component in turn generates a setpoint for a position controller of the electromotive actuator 12, with the result of the different approximation curves C, C 'of the electromotive actuator 11 to the movement of the accelerator pedal-side actuator 8.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

The invention relates to a method for operating a throttle valve controlled internal combustion engine in the idling range, the throttle valve being controllable, on the one hand, via an accelerator pedal and, in addition, in the idling range, via an actuator driven by an electric motor. In the case of control via the actuator driven by an electric motor, an actuating element which can be acted upon by the accelerator pedal and is prestressed in the cut-back direction is in the position LLmin, with the result that a free play is established between this and an actuating element on the throttle valve side. The invention proposes that, when the accelerator pedal is actuated, the throttle valve should not remain in its position but that an actuation of the throttle valve via the actuator should take place in synchronism with the movement of the actuating element on the accelerator pedal side, with the result that the driver has no sensation of free play due to the acceleration demand.

Description

Die Erfindung betrifft ein Verfahren zum Betreiben einer drosselklappengeregelten Brennkraftmaschine im Leerlaufregelbereich, wobei die Drosselklappe in Abregelrichtung vorgespannt ist, und ein fahrpedalseitig in Vollastrichtung ansteuerbares, in Abregelrichtung gegen einen Leerlaufanschlag in eine Stellung LLmin vorspannbares Stellelement in Aufregelrichtung in den Bewegungsweg eines Stellelementes für die Drosselklappe eingreift, sowie ein mittels eines elektromotorischen Stellantriebes im Leerlaufregelbereich ansteuerbares, in Abregelrichtung vorgespanntes Stellelement in Aufregelrichtung in den Bewegungsweg des Stellelementes für die Drosselklappe eingreift.The invention relates to a method for operating a throttle valve-controlled internal combustion engine in the idle control range, the throttle valve being biased in the regulating direction, and an actuating element that can be actuated in the full-load direction on the accelerator pedal side and can be preloaded in the regulating direction against an idling stop in a position LL min in the regulating direction in the movement path of an actuating element for the throttle valve engages, as well as an actuating element which is controllable by means of an electromotive actuator in the idle control area and is biased in the regulating direction in the regulating direction engages in the movement path of the actuating element for the throttle valve.

Bei Leerlaufregelanlagen, bei denen die Leerlaufluftmenge durch elektromotorisches Verstellen des Drosselklappenwinkels gesteuert wird, muß beim Betätigen des Fahrpedals aus der Ausgangsstellung LLmin zunächst ein Leerweg überwunden werden, bevor das die Drosselklappe verstellende drosselklappenseitige Stellelement vom fahrpedalseitigen Stellelement beaufschlagt wird, das seinerseits von einem Bowdenzug bzw. einer Seilscheibe mitgenommen wird. Erkennt der Regler der Leerlaufregelanlage, daß der Fahrer das Fahrpedal betätigt, beispielsweise indem ein der Stellung LLmin zugeordneter Leerlaufkontakt schaltet, so wird die Drosselklappe elektromotorisch in ihrer momentanen Position gehalten, bis das drosselklappenseitige Stellelement vom fahrpedalseitigen Stellelement mitgenommen wird. Die Länge des Leerweges hängt somit vom momentanen Arbeitspunkt ab. Insbesondere bei kalter Brennkraftmaschine oder zugeschalteter Last, beispielsweise einer Klimaanlage, wird der dann relativ lange Leerweg zwischen der LLmin-Stellung des fahrpedalseitigen Stellelementes und dem Arbeitspunkt als unangenehm empfunden.In idle control systems, in which the idle air volume is controlled by electromotive adjustment of the throttle valve angle, an idle path must first be overcome when the accelerator pedal is actuated from the starting position LL min before the throttle valve-side adjusting element is acted upon by the accelerator pedal-side actuating element, which in turn is actuated by a Bowden cable or a pulley is taken. If the controller of the idle control system detects that the driver is actuating the accelerator pedal, for example by switching an idle contact assigned to the position LL min , the throttle valve is held in its current position by an electric motor until the throttle valve-side control element is carried along by the accelerator pedal-side control element. The length of the free travel therefore depends on the current working point. Particularly when the internal combustion engine is cold or a load is switched on, for example an air conditioning system, the then relatively long free travel between the LL min position of the actuating element on the accelerator pedal and the working point is perceived as unpleasant.

Es ist Aufgabe der vorliegenden Erfindung, ein Verfahren der genannten Art so weiter zu bilden, daß unabhängig von der jeweils eingenommenen Leerlaufstellung der Drosselklappe unter stellmotorischer Einwirkung bei einer anschließenden Ansteuerung der Drosselklappe über das Fahrpedal die Drosselklappe in Aufregelrichtung bewegt wird.It is an object of the present invention to further develop a method of the type mentioned so that regardless of the idle position of the throttle valve which is assumed in each case under the influence of a servomotor when the throttle valve is subsequently actuated via the accelerator pedal, the throttle valve is moved in the regulating direction.

Gelöst wird die Aufgabe dadurch, daß bei einer Ansteuerung des fahrpedalseitigen Stellelementes während dessen Aufregelung mittels des Fahrpedals das stellantriebseitige Stellelement aus der eingenommenen Leerlaufstellung elektromotorisch geregelt wird, wobei die Öfffnungskennlinie des stellantriebsseitigen Stellelementes so ausgelegt ist, daß es in einem sich stetig verkleinernden Abstand vor dem fahrpedalseitigen Stellelement herläuft, wobei der Abstand zwischen dem fahrpedalseitigen Stellelement und dem drosselklappenseitigen Stellelement spätestens in der Position LLmax gleich Null wird.The object is achieved in that when the accelerator pedal-side control element is actuated during its regulation by means of the accelerator pedal, the actuator-side control element is regulated by an electric motor from the idling position assumed, the opening characteristic of the actuator-side control element being designed such that it is at a continuously decreasing distance in front of the Accelerator pedal-side control element runs, the distance between the accelerator pedal-side control element and the throttle valve-side control element becoming zero at the latest in position LL max .

Erfindungsgemäß verharrt bei einer Betätigung des Fahrpedals die Drosselklappe nicht in ihrer momentanen Position, sondern wird elektromotorisch in Aufregelrichtung betätigt, wobei die Aufregelgeschwindigkeit des stellantriebseitigen Stellelementes geringer ist als die des fahrpedalseitigen Stellantriebes. Die Relativgeschwindigkeit von fahrpedalseitigem und stellantriebseitigem Stellelement ist so bemessen, daß das fahrpedalseitige Stellelement innerhalb des Regelbereiches des stellantriebseitigen Stellelementes in Anlage mit dem drosselklappenseitigen Stellelement gelangt und damit die Drosselklappe über das Fahrpedal bewegt wird. Bei dieser Regelung erfolgt somit eine stetige Verstellung des Drosselklappenwinkels, so daß der Fahrer keinen durch einen Leerweg bedingten Regelsprung empfinden kann.According to the invention, when the accelerator pedal is actuated, the throttle valve does not remain in its current position, but is actuated by an electric motor in the upward direction, the upward speed of the actuating element on the actuator side being lower than that of the accelerator pedal-side actuator. The relative speed of the accelerator pedal-side and actuator-side actuating element is dimensioned such that the accelerator pedal-side actuating element comes into contact with the throttle valve-side actuating element within the control range of the actuator-side actuating element and the throttle valve is thus moved via the accelerator pedal. With this control, the throttle valve angle is thus continuously adjusted so that the driver cannot feel any control jump caused by an idle travel.

Bevorzugt erreichen das stellantriebseitige und das fahrpedalseitige Stellglied im wesentlichen gleichzeitig die Position LLmax. Es wird somit der gesamte Regelbereich des elektromotorischen Stellantriebes dazu genutzt, die Annäherung des fahrpedalseitigen Stellgliedes an das stellantriebseitige Stellglied herbeizuführen.Preferably, the actuator-side and the accelerator-side actuator reach the position LL max essentially simultaneously. The entire control range of the electromotive actuator is thus used to bring the accelerator pedal-side actuator closer to the actuator-side actuator.

Vorteilhaft weist das stellantriebseitige Stellelement eine progressive Bewegung gegenüber der des fahrpedalseitigen Stellelementes auf. Hierdurch ist eine deutlich verbesserte Regelung im Bereich kleiner Drosselklappenwinkel gewährleistet.The actuator-side actuator advantageously has a progressive movement relative to that of the accelerator-pedal actuator. This ensures a significantly improved control in the area of small throttle valve angles.

Zweckmäßig liefert ein die Position des fahrpedalseitigen Stellelementes erfassendes Potentiometer eine Sollwertvorgabe für ein Elektronikbauteil, das einen Sollwert für einen Lageregler des elektromotorischen Stellantriebes generiert. Sobald das Fahrpedal betätigt wird, kann somit eine Öffnung der Drosselklappe mit einer vom Arbeitspunkt abhängigen Kennlinie erfolgen.A potentiometer which detects the position of the accelerator pedal-side control element expediently supplies a setpoint specification for an electronic component, which generates a setpoint value for a position controller of the electromotive actuator. As soon as the accelerator pedal is actuated, the throttle valve can be opened with a characteristic curve dependent on the operating point.

Weitere Merkmale der Erfindung sind in der Beschreibung der Figuren dargestellt, wobei bemerkt wird, daß alle Einzelmerkmale und alle Kombinationen von Einzelmerkmalen erfindungswesentlich sind.Further features of the invention are shown in the description of the figures, it being noted that all individual features and all combinations of individual features are essential to the invention.

In der Darstellung der Figuren ist das erfindungsgemäße Verfahren an einem Beispiel erläutert. Es zeigt:

  • Figur 1 ein Blockschaltbild zur Verdeutlichung der Anordnung der die Brennkraftmaschine im erfindungsgemäßen Sinne regelnden Bauteile und
  • Figur 2 eine Diagrammdarstellung zur Verdeutlichung der erfindungsgemäßen Leerlaufregelung.
In the illustration of the figures, the method according to the invention is explained using an example. It shows:
  • Figure 1 is a block diagram to illustrate the arrangement of the components regulating the internal combustion engine in the sense of the invention and
  • FIG. 2 shows a diagram to illustrate the idle control according to the invention.

In Figur 1 bezeichnet die Ziffer 1 eine Lastverstelleinrichtung, die extern über ein Fahrpedal 2 und eine Elektronik 3 ansteuerbar ist. Die Lastverstelleinrichtung 1 beinhaltet eine Drosselklappe 4, die über ein drosselklappenseitiges Stellelement 5 verstellbar ist. Eine Zugfeder 6 greift an dem drosselklappenseitigen Stellelement 5 und an einem stationären Bauteil der Lastverstelleinrichtung 1 an und spannt das drosselklappenseitige Stellelement 5 in Leerlaufrichtung vor. Die Drosselklappe 4 ist zwischen einer minimalen Leerlaufstellung LLmin und einer Vollaststellung VL regelbar.In FIG. 1, the numeral 1 designates a load adjustment device which can be controlled externally via an accelerator pedal 2 and electronics 3. The load adjustment device 1 includes a throttle valve 4, which is adjustable via an actuator 5 on the throttle valve side. A tension spring 6 engages the dros Sel flap-side actuating element 5 and on a stationary component of the load adjusting device 1 and prestresses the throttle valve-side actuating element 5 in the idling direction. The throttle valve 4 can be regulated between a minimum idle position LL min and a full load position VL.

Das Fahrpedal 2 wirkt über eine Bowdenzug 7 mit einem fahrpedalseitigen Stellelement 8 zusammen, das mittels des Fahrpedals 2 zwischen einem Anschlag LLmin und einem Anschlag VL beweglich ist. Eine Zugfeder 9 greift am fahrpedalseitigen Stellelement 8 und einem stationären Bauteil der Lastverstelleinrichtung 1 an und spannt das fahrpedalseitige Stellelement 8 in Leerlaufrichtung gegen den Anschlag LLmin vor. Die Position des fahrpedalseitigen Stellelementes 8 wird durch ein Istwerterfassungselement 10 erfaßt, das beispielsweise als Potentiometer ausgebildet und auf dem als Seilscheibe ausgebildeten fahrpedalseitigen Stellelement 8 angeordnet ist.The accelerator pedal 2 interacts via a Bowden cable 7 with an actuating element 8 on the accelerator pedal side, which is movable by means of the accelerator pedal 2 between a stop LL min and a stop VL. A tension spring 9 engages the accelerator pedal-side control element 8 and a stationary component of the load adjustment device 1 and prestresses the accelerator pedal-side control element 8 against the stop LL min in the idling direction. The position of the accelerator pedal-side control element 8 is detected by an actual value detection element 10, which is designed, for example, as a potentiometer and is arranged on the accelerator pedal-side control element 8, which is designed as a rope pulley.

Wie der Darstellung der Figur 1 zu entnehmen ist, greift das fahrpedalseitige Stellelement 8 in Aufregelrichtung in den Bewegungsweg des drosselklappenseitigen Stellelementes 5 ein. Unabhängig hiervon greift ein stellantriebsseitige Stellelement 11 in Aufregelrichtung in den Bewegungsweg des drosselklappenseitigen Stellelementes 5 ein. Das stellantriebseitige Stellelement 11 ist mittels eines elektromotorischen Stellantriebes 12 zwischen einem LLmin-Anschlag und einem LLmax-Anschlag bewegbar. Die Position des stellantriebseitigen Stellelementes 11 wird über ein weiteres Istwerterfassungselement 13 erfaßt, das beispielsweise wieder als Potentiometer ausgebildet sein kann. Eine Zugfeder 14 greift am stellantriebseitigen Stellelement 11 und einem stationären Bauteil der Lastverstelleinrichtung 1 an und spannt das stellantriebseitige Stellelement 11 in Abregelrichtung gegen den Anschlag LLmin vor.As can be seen from the illustration in FIG. 1, the accelerator pedal-side actuating element 8 engages in the opening direction in the movement path of the throttle valve-side actuating element 5. Independently of this, an actuating element 11 on the actuator side engages in the regulating direction in the movement path of the actuating element 5 on the throttle valve side. The actuating element 11 on the actuator side can be moved between an LL min stop and an LL max stop by means of an electromotive actuator 12. The position of the actuator element 11 on the actuator side is detected via a further actual value detection element 13, which can again be designed as a potentiometer, for example. A tension spring 14 engages the actuator-side actuating element 11 and a stationary component of the load adjustment device 1 and prestresses the actuator-side actuating element 11 in the regulating direction against the stop LL min .

Die insoweit beschriebene Einrichtung zur Verstellung der Last einer Brennkraftmaschine wird im Leerlaufregelbereich über den elektromotorischen Stellantrieb 12 angesteuert und im Teillastsowie Vollastbetrieb über das Fahrpedal 2. Im Leerlaufbetrieb - bei nicht betätigtem Fahrpedal 2 - nimmt das fahrpedalseitige Stellelement 8 die gezeigte Anschlagsposition LLmin ein, während die Drosselklappe 4 sich in Abhängigkeit von der Ansteuerung über den elektromotorischen Stellantrieb 12, der seinerseits von der Elektronik 3 angesteuert wird, in einem Arbeitspunkt befindet, der im Beispiel nach der Figur 1 etwa in der Mitte zwischen den Betriebsstellungen LLmin und LLmax liegt. Dieser Arbeitspunkt kann selbstverständlich variieren, er hängt z.B. ab von der Betriebstemperatur der Brennkraftmaschine und den Verbrauchern (beispielsweise Heckscheibenheizung, Klimaanlage), die von der Brennkraftmaschine versorgt werden müssen und damit einen bestimmten, veränderlichen Luftbedarf der Brennkraftmaschine bedingen.The device described so far for adjusting the load of an internal combustion engine is controlled in the idle control range via the electromotive actuator 12 and in part-load as well as full-load operation via the accelerator pedal 2. In idle operation - with the accelerator pedal 2 not actuated - the accelerator-side actuating element 8 assumes the stop position LL min shown, while the throttle valve 4 is, depending on the control via the electromotive actuator 12, which in turn is controlled by the electronics 3, at a working point which, in the example according to FIG. 1, lies approximately in the middle between the operating positions LL min and LL max . This operating point can of course vary, it depends, for example, on the operating temperature of the internal combustion engine and the consumers (for example rear window heating, air conditioning system) which have to be supplied by the internal combustion engine and thus cause a specific, changing air requirement of the internal combustion engine.

Die Ansteuerung der Drosselklappe 4 über den elektromotorischen Stellantrieb 12 führt dazu, daß bei einer Stellung des stellantriebseitigen Stellelementes 12, die nicht mit der Stellung LLmin zusammenfällt, ein Leerweg zwischen dem drosselklappenseitigen Stellelement 5 und dem fahrpedalseitigen Stellelement 8 verbleibt. Figur 2 verdeutlicht die Ausgangssituation für die in Figur 1 gezeigte Betriebsstellung. In dem dort gezeigten Diagramm ist der Drosselklappen (DK)-Winkel über dem Pedalweg aufgetragen. Der Arbeitspunkt A der Drosselklappe befindet sich etwa auf der Hälfte zwischen den Betriebsstellungen LLmin und LLmax. Soll ausgehend von diesem Arbeitspunkt A die Drosselklappe 4 nur über das Fahrpedal 2 angesteuert werden, müßte normalerweise der Leerweg zwischen dem drosselklappenseitigen Stellelement 5 und dem fahrpedalseitigen Stellelement 8, der in Figur 2 mit der Strecke B1 bezeichnet ist, zunächst überbrückt werden, ehe nach Anlage des fahrpedalseitigen Stellelementes 8 am drosselklappenseitigen Stellelement 5 die Drosselklappe 4 in linearer Bewegung zum Fahrpedal 2 entlang der Geraden B2 verschwenkt werden kann. Erfindungsgemäß ist nun vorgesehen, daß das drosselklappenseitige Stellelement 5 und damit die Drosselklappe 4 nicht bis zur Anlage des fahrpedalseitigen Stellelementes 8 verharrt, sondern daß das drosselklappenseitige Stellelement 5 bei einer Aufregelungsbewegung des fahrpedalseitigen Stellelementes 8 entsprechend der Kurve C über den elektromotorischen Stellantrieb 12 und damit das stellantriebseitige Stellelement 11 aufgeregelt wird. Figur 2 verdeutlicht, daß die Kurve C ausgehend vom Arbeitspunkt A progressiv verläuft und die Gerade B2 etwa im Betriebspunkt LLmax schneidet. Das der Bewegung des stellantriebseitigen Stellelementes 11 nacheilende fahrpedalseitige Stellelement 8 hat das stellantriebseitige Stellelement 11 somit am Ende von dessen Regelbereich eingeholt und kann von da ab, das heißt im Teillast- und Vollastbereich, die Regelung der Drosselklappe 4 durch das Fahrpedal 2 übernehmen.The control of the throttle valve 4 via the electromotive actuator 12 leads to an empty path between the throttle valve-side actuating element 5 and the accelerator pedal-side actuating element 8 remaining when the actuator element 12 is in a position that does not coincide with the position LL min . Figure 2 illustrates the initial situation for the operating position shown in Figure 1. In the diagram shown there, the throttle valve (DK) angle is plotted over the pedal travel. The operating point A of the throttle valve is approximately halfway between the operating positions LL m in and LL max . If, starting from this working point A, the throttle valve 4 is only to be controlled via the accelerator pedal 2, the free travel between the throttle valve-side actuating element 5 and the accelerator pedal-side actuating element 8, which is designated by the path B 1 in FIG. 2, would first have to be bridged before System of the accelerator pedal-side control element 8 on the throttle valve-side control element 5, the throttle valve 4 can be pivoted in a linear movement to the accelerator pedal 2 along the straight line B 2 . According to the invention, it is now provided that the throttle valve-side control element 5 and thus the throttle valve 4 does not remain until the accelerator pedal-side control element 8 abuts, but that the throttle valve-side control element 5 during an upward movement of the accelerator pedal-side control element 8 according to curve C via the electromotive actuator 12 and thus that actuator-side actuator 11 is adjusted. FIG. 2 illustrates that curve C proceeds progressively from working point A and intersects straight line B 2 approximately at operating point LL max . The accelerator pedal-side actuating element 8 lagging the movement of the actuator-side actuating element 11 has thus caught up with the actuator-side actuating element 11 at the end of its control range and from then on, that is to say in the part-load and full-load range, can take over the control of the throttle valve 4 by the accelerator pedal 2.

Figur 2 verdeutlicht ferner einen möglichen Regelungsverlauf der Drosselklappe bei einem Arbeitspunkt A' der Drosselklappe 4, der näher der Betriebsstellung LLmin ist. Hier wäre vom fahrpedalseitigen Stellelement 8 nur ein geringerer Leerweg Bi' Zu überbrücken, ehe es zur Beaufschlagung des drosselklappenseitigen Stellelementes 5 im Bereich der Geraden B2' käme. Erfindungsgemäß wird bei diesem Arbeitspunkt A' die Drosselklappe 4 über den elektromotorischen Stellantrieb 12 entlang der steileren Kurve C' geregelt, die die Gerade B2' schon vor dem Betriebspunkt LLmax schneidet. Die Alternative soll verdeutlichen, daß das fahrpedalseitige Stellelement 8 bereits vor Erreichen des Regelbereichsendes des elektromotorischen Stellantriebes 12 die Regelung der Drosselklappe 4 übernehmen kann.FIG. 2 also illustrates a possible course of control of the throttle valve at an operating point A ′ of the throttle valve 4 that is closer to the operating position LL min . Here, only a smaller free travel Bi 'would have to be bridged by the accelerator pedal-side actuating element 8 before the actuating element 5 on the throttle valve side was acted upon in the region of the straight line B 2 '. According to the invention, at this working point A ', the throttle valve 4 is regulated via the electromotive actuator 12 along the steeper curve C' which intersects the straight line B 2 'before the operating point LL max det. The alternative is intended to clarify that the accelerator pedal-side control element 8 can take over the control of the throttle valve 4 even before the control range end of the electromotive actuator 12 is reached.

Um eine Regelung der Brennkraftmaschine aus unterschiedlichen Arbeitspunkten A, A' usw. der Drosselklappe 4 zu gewährleisten, ist vorgesehen, daß das die Position des fahrpedalseitigen Stellelementes 8 erfassende Potentiometer 10 eine Sollwertvorgabe für ein Elektronikbauteil, das grundsätzlich in die Elektronik 3 integriert ist, liefert. Dieses Elektronikbauteil generiert seinerseits einen Sollwert für einen Lageregler des elektromotorischen Stellantriebes 12, mit der Folge der unterschiedlichen Annäherungskurven C, C' des elektromotorischen Stellelementes 11 an die Bewegung des fahrpedalseitigen Stellelementes 8.In order to ensure control of the internal combustion engine from different operating points A, A 'etc. of the throttle valve 4, it is provided that the potentiometer 10 detecting the position of the accelerator pedal-side control element 8 provides a setpoint specification for an electronic component which is fundamentally integrated in the electronics 3 . This electronic component in turn generates a setpoint for a position controller of the electromotive actuator 12, with the result of the different approximation curves C, C 'of the electromotive actuator 11 to the movement of the accelerator pedal-side actuator 8.

BezugszeichenlisteReference symbol list

  • 1 Lastverstelleinrichtung1 load adjustment device
  • 2 Fahrpedal2 accelerator pedal
  • 3 Elektronik3 electronics
  • 4 Drosselklappe4 throttle valve
  • 5 drosselklappenseitiges Stellelement5 throttle valve side actuator
  • 6 Zugfeder6 tension spring
  • 7 Bowdenzug7 Bowden cable
  • 8 fahrpedalseitiges Stellelement8 accelerator-side actuator
  • 9 Zugfeder9 tension spring
  • 10 Istwerterfassungselement10 actual value acquisition element
  • 11 stellantriebseitiges Stellelement11 actuator-side actuator
  • 12 elektromotorischer Stellantrieb12 electromotive actuator
  • 13 Istwerterfassungselement13 Actual value acquisition element
  • 14 Zugfeder14 tension spring

Claims (4)

1. Verfahren zum Betreiben einer drosselklappengeregelten Brennkraftmaschine im Leerlaufregelbereich, wobei die Drosselklappe in Abregelrichtung vorgespannt ist, und ein fahrpedalseitig in Vollastrichtung ansteuerbares, in Abregelrichtung gegen einen Leerlaufanschlag in eine Stellung LLmin vorspannbares Stellelement in Aufregelrichtung in den Bewegungsweg eines Stellelementes für die Drosselklappe eingreift, sowie ein mittels eines elektromotorischen Stellantriebes im Leerlaufregelbereich ansteuerbares, in Abregelrichtung vorgespanntes Stellelement in Aufregelrichtung in den Bewegungsweg des Stellelementes für die Drosselklappe eingreift, dadurch gekennzeichnet, daß bei einer Ansteuerung des fahrpedalseitigen Stellelementes (8) während dessen Aufregelung mittels des Fahrpedales (2) das stellantriebseitige Stellelement (11) aus der eingenommenen Leerlaufstellung elektromotorisch geregelt wird, wobei die Öffnungskennlinie (C) des stellantriebseitigen Stellelementes (11) so ausgelegt ist, daß es in einem sich stetig verkleinernden Abstand vor dem fahrpedalseitigen Stellelement (8) herläuft, wobei der Abstand zwischen dem fahrpedalseitigen Stellelement (8) und dem drosselklappenseitigen Stellelement (5) spätestens in der Position LLmax gleich Null wird.1. Method for operating a throttle valve-controlled internal combustion engine in the idle control range, the throttle valve being pretensioned in the regulating direction, and an actuating element which can be actuated in the full-load direction on the accelerator pedal side and can be preloaded in the regulating direction against an idling stop in a position LL min in the regulating direction in the movement path of an actuating element for the throttle valve. and an actuating element which is controllable by means of an electromotive actuator in the idling control area and is biased in the regulating direction engages in the regulating direction in the movement path of the actuating element for the throttle valve, characterized in that when the accelerator pedal-side actuating element (8) is actuated during its actuation by means of the accelerator pedal (2), the actuating pedal side The control element (11) is regulated by an electric motor from the idling position it has assumed, the opening characteristic curve (C) of the control element (11) on the actuator side being designed in this way t is that it runs at a steadily decreasing distance in front of the accelerator pedal-side control element (8), the distance between the accelerator pedal-side control element (8) and the throttle valve-side control element (5) becoming zero at the latest in position LL max . 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das stellantriebseitige (11) und das fahrpedalseitige Stellelement (8) im wesentlichen gleichzeitig die Position LLmax erreichen.2. The method according to claim 1, characterized in that the actuator-side (11) and the accelerator pedal-side actuating element (8) reach the position LL max substantially simultaneously. 3. Verfahren nach Anspruch 1 oder 2, gekennzeichnet durch eine progressive Bewegung des stellantriebseitigen Stellelementes (11) gegenüber der Bewegung des fahrpedalseitigen Stellelementes (8).3. The method according to claim 1 or 2, characterized by a progressive movement of the actuator-side control element (11) relative to the movement of the accelerator pedal-side control element (8). 4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß ein die Position des fahrpedalseitigen Stellelementes (8) erfassendes Istwerterfassungselement (10) eine Sollwertvorgabe für ein Elektronikbauteil (3) liefert, das einen Sollwert für einen Lageregler des elektromotorischen Stellantriebes (12) generiert.4. The method according to any one of claims 1 to 3, characterized in that an actual value detection element (10) detecting the position of the accelerator pedal-side control element (8) supplies a setpoint specification for an electronic component (3) which provides a setpoint value for a position controller of the electromotive actuator (12 ) generated.
EP19910112926 1991-01-09 1991-08-01 Method for controlling a throttle valve operated internal combustion engine in the idling range Withdrawn EP0494337A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4100380 1991-01-09
DE19914100380 DE4100380A1 (en) 1991-01-09 1991-01-09 METHOD FOR OPERATING A THROTTLE VALVE-CONTROLLED INTERNAL COMBUSTION ENGINE IN THE IDLE CONTROL AREA

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EP0494337A2 true EP0494337A2 (en) 1992-07-15
EP0494337A3 EP0494337A3 (en) 1993-08-04

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EP1277940A3 (en) * 2001-07-19 2006-05-03 Robert Bosch Gmbh Method and device for the operation of a drive engine

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DE19621767C2 (en) * 1996-05-30 2002-06-27 Siemens Ag Method for determining a load signal of an internal combustion engine
DE10047602B4 (en) * 2000-09-26 2004-09-30 Siemens Ag Method for operating an internal combustion engine
DE10148343B4 (en) * 2001-09-29 2015-08-06 Robert Bosch Gmbh Method and device for controlling a drive unit
DE102004041660B3 (en) * 2004-08-27 2006-05-04 Siemens Ag Method and device for determining an output torque

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DE4100380A1 (en) 1992-07-16
EP0494337A3 (en) 1993-08-04

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