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EP0326553A1 - System for regulated dosing of combustion air into an internal combustion engine. - Google Patents

System for regulated dosing of combustion air into an internal combustion engine.

Info

Publication number
EP0326553A1
EP0326553A1 EP87905601A EP87905601A EP0326553A1 EP 0326553 A1 EP0326553 A1 EP 0326553A1 EP 87905601 A EP87905601 A EP 87905601A EP 87905601 A EP87905601 A EP 87905601A EP 0326553 A1 EP0326553 A1 EP 0326553A1
Authority
EP
European Patent Office
Prior art keywords
throttle valve
spring
actuating shaft
return spring
torque
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.)
Granted
Application number
EP87905601A
Other languages
German (de)
French (fr)
Other versions
EP0326553B1 (en
EP0326553B2 (en
Inventor
Peter Cornelius
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0326553A1 publication Critical patent/EP0326553A1/en
Publication of EP0326553B1 publication Critical patent/EP0326553B1/en
Application granted granted Critical
Publication of EP0326553B2 publication Critical patent/EP0326553B2/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M19/00—Details, component parts, or accessories of carburettors, not provided for in, or of interest apart from, the apparatus of groups F02M1/00 - F02M17/00
    • F02M19/12—External control gear, e.g. having dash-pots
    • 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
    • F02D11/107—Safety-related aspects

Definitions

  • the invention relates to a device according to the preamble of the main claim.
  • a device for adjusting the throttle valve of an internal combustion engine in a motor vehicle is known from German patent specification 1023 268.
  • This device comprises a slotted-lever mechanism, with the aid of which the straight guidance of an accelerator pedal linkage is replaced by a more easily lubricated rocker guidance.
  • a spring preloaded between two fixed stops and a rocking lever stop an increased restoring force is generated as soon as the actuating lever is brought into a position between a certain limit position I and the maximum position II.
  • a pressure point is therefore provided which indicates to the vehicle driver that a certain opening of the throttle valve has been reached (kick-down threshold).
  • a first advantage of the invention is that the problem of freezing of the throttle valve is overcome by the freezing of the throttle valve no longer being able to occur when the vehicle is parked, because the throttle valve does not assume a rest position in this state in such a way that it could freeze flat. In this way, the provision of appropriate peak drive power to tear away a flat frozen throttle valve is completely eliminated, which leads to a cost-effective design of the required control output stage in an electronic control unit.
  • Another advantage of the invention is that in the event of failure of the electronic control unit, or its power supply, or the control output stage for the throttle valve contained in this control unit, the latter assumes such a rest position due to recirculation by a spring that sufficient combustion air is still available to maintain emergency operation in the internal combustion engine can get.
  • Another advantage of the invention is that when the on-board electrical system voltage drops during start-up attempts at a low ambient temperature, no additional electrical energy has to be provided, only to provide sufficient combustion air for the internal combustion engine. to get the engine. This improves the voltage level of the vehicle electrical system, especially when the starter battery is under high stress.
  • FIG. 1 shows a schematic functional diagram of the device according to the invention for the electrically controlled metering of combustion air into an internal combustion engine
  • FIG. 2 shows a diagram of the basic course of the torque of a throttle valve rotary actuator over the position angle ⁇ of the throttle valve
  • FIG. 3 shows a schematic illustration of a practical implementation the device according to the invention.
  • the device according to the invention for the electrically controlled metering of combustion air into an internal combustion engine comprises a channel 10 for guiding combustion air 28 through which a rotatably mounted actuating shaft 12 projects, which in turn carries a throttle valve 11 which is fastened to it and thereby pivotable.
  • the adjusting shaft 12 is driven or positioned by an electromotive actuator 13; the necessary control signals are fed to the turntable via connecting lines 14.
  • the actuating shaft 12 carries a driver 18 which serves as a movable abutment for a first end 17 of a return spring 15.
  • the second end 16 this water return spring 15 is fixed in a suitable manner spatially fixed.
  • the return spring 15 generates a certain restoring torque, which the throttle valve 11 seeks to return to the closed position.
  • the lines 26a and 26b represent that surface line of the combustion air duct 10 against which the throttle valve 11 rests in the completely closed state, ie along which the throttle valve could freeze "flat" along its entire circumference.
  • the actuating shaft 12 also carries a further driver 19- A second counter-spring 21 is clamped with its one end 22 fixed in space; the second end 23 rests on an abutment 25 which is adjustable tangentially to the actuating shaft 12, so that the spring is under a certain rest tension.
  • the driver 19 connected in a rotationally fixed manner to the actuating shaft 12 has an abutment 20 which is guided by the return spring 15 and by the restoring torque transmitted via the driver 18 to the actuating shaft 12 against the resting end 23 of the counter spring 21 as a rest bearing.
  • the throttle valve 11 does not close completely and that the electromotive actuator 13 has to generate a changing torque in order to adjust the throttle valve from the maximum opening into the completely closed position, so that its bordering on the mentioned surface lines 26a and 26b abuts.
  • the throttle valve 11 thus has a certain rest opening angle ⁇ r , which can be adjusted precisely by adjusting the adjustable stop element 25.
  • FIG. 2 illustrates the course of the normalized torque Mc to be applied by the electromotive actuator 13 over the position angle ⁇ of the throttle valve 11; at the rest angle ⁇ r of the throttle valve, the directional reversal of the actuating torque occurs, so that the electromotive actuator 13, in order to bring the throttle valve 11 into the completely closed position, must generate an actuating torque with the opposite sign.
  • the slope of the torque line in the range 0 ⁇ ⁇ r is obtained by superimposing the torque characteristic for the spring 15 and for the counter spring 21.
  • the scope of the invention is not left by a different design of the springs 15 and 21, for example in the form of spiral springs or curved strip springs; the elements described can also be arranged either distributed on one side or on both sides of the throttle valve.
  • the driver 18 can also be designed as an abutment for the return spring 15 and the driver 19 with the abutment 20 for the counter spring 21 as a single body, in that both springs act on a single, rotationally fixedly connected to the actuating shaft 12 driver element, as this is illustrated in Figure 3 for completeness.

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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

Le système décrit autorise, en cas de défaillance de l'actuateur électrique (13) sur l'étrangleur (11) ou de la commande ou encore de l'alimentation en courant dudit actuateur, un fonctionnement en régime de secours et empêche de manière fiable un blocage de l'étrangleur (11) dans une position de repos. Il est prévu un ressort de rappel (15) à engrènement permanent avec l'arbre (12) de l'étrangleur et un ressort antagoniste (21) précontraint à engrènement partiel avec ledit arbre (12), lesquels ressorts coopèrent avec un actuateur (13) électromoteur.The system described allows, in the event of failure of the electric actuator (13) on the throttle (11) or of the control or even of the current supply of said actuator, operation in emergency mode and reliably prevents locking the choke (11) in a rest position. There is provided a return spring (15) in permanent mesh with the shaft (12) of the throttle and a counter spring (21) pre-stressed in partial mesh with said shaft (12), which springs cooperate with an actuator (13 ) electric motor.

Description

Einrichtung zur gesteuerten Zumessung von Verbrennungsluft in eine Brennkraftmaschine Device for the controlled metering of combustion air in an internal combustion engine
Stand der TechnikState of the art
Die Erfindung geht aus von einer Einrichtung nach der Gattung des Hauptanspruchs.The invention relates to a device according to the preamble of the main claim.
Aus der deutschen Patentschrift 1023 268 ist eine Vorrichtung zum Verstellen der Drosselklappe einer Brennkraftmaschine in einem Kraftfahrzeug bekannt. Diese Vorrichtung umfaßt ein Schlitzhebelgetriebe, mit dessen Hilfe zum einen die Geradführung eines Gaspedal- gestänges durch eine besser schmierbare Schwingenführung ersetzt wird. Zum anderen wird dort mit Hilfe einer zwischen zwei festen Anschlägen vorgespannten Feder und eines Schwinghebelanschlags eine verstärkte Rückstellkraft erzeugt, sobald der Betätigungshebel in eine Stellung zwischen einer bestimmten Grenzlage I und der Maximalstellung II gebracht wird. Es wird also ein Druckpunkt vorgesehen, der dem Fahrzeugführer das Erreichen einer bestimmten Öffnung der Drosselklappe anzeigt (Kick-Down-Schwelle). Durch geeignete Gestaltung der Kontur des Getriebeschlitzes im Schlitzhebel läßt jene Vorrichtung im übrigen auf rein mechanische Weise eine nicht winkeltreue, sondern beispielsweise fahrzeug- oder motorspezifisch angepaßte Übersetzung der Fahrpedalstellung auf die Drosselklappenstel lung zu, so daß auch eine nicht proportionale Abhängigkeit der Drosselklappenstellung von der Fahrpedalstellung leicht zu realisieren ist. Diese bekannte Lösung sieht jedoch keinerlei Maßnahmen sowohl zur Bereitstellung einer Notfahrfunktion noch zum Vermeiden des Festfrierens der Drosselklappe vor.A device for adjusting the throttle valve of an internal combustion engine in a motor vehicle is known from German patent specification 1023 268. This device comprises a slotted-lever mechanism, with the aid of which the straight guidance of an accelerator pedal linkage is replaced by a more easily lubricated rocker guidance. On the other hand, with the help of a spring preloaded between two fixed stops and a rocking lever stop, an increased restoring force is generated as soon as the actuating lever is brought into a position between a certain limit position I and the maximum position II. A pressure point is therefore provided which indicates to the vehicle driver that a certain opening of the throttle valve has been reached (kick-down threshold). By suitably designing the contour of the gear slot in the slot lever, that device leaves in a purely mechanical way a translation of the accelerator pedal position to the throttle valve position that is not true to the angle, but rather, for example, adapted to the vehicle or engine tion, so that a non-proportional dependence of the throttle valve position on the accelerator pedal position is easy to implement. However, this known solution does not provide any measures either to provide an emergency drive function or to prevent the throttle valve from freezing.
Bei. neueren, elektronisch arbeitenden Systemen zur Gemischzumessung eπtfiäUfc in der Regel eine mechanische Kopplung zwischen Fahrpedal und' Drosselklappe. Vielmehr wird bei solchen Sysemen die Drosselklappe von einem elektromotorischen Steller angetrieben oder eingestellt, welcher Stellbefehle unmittelbar von einem elektronischen Steuergerät über eine elektrische Leitung empfängt; dasselbe elektronische Steuergerät empfängt hierzu von einem Fahrpedalstellungs- geber den Fahrerwunsch ebenfalls über eine elektrische Leitung. Als elektromotorische Steller. kommen dabei untersetzte Gleichstrommotoren (meist in permanenterregter Ausführung) oder sogenannte Drehsteller in Betracht, die im Prinzip ähnlich wie ein Drehspulmeßwerk funktionieren und jedenfalls in Abhängigkeit von der mittleren Stromstärke bzw. des Tastverhältnisses des Betriebsstromes in wenigstens einer Stellwicklung eine bestimmte Lage einnehmen. Um solche Drehsteller mit einer geringstmöglichen elektrischen Leistung betreiben zu können, kann die Federkonstante der Rückstellfeder der Drosselklappe nicht beliebig groß gemacht werden. Andererseits reicht eine wünschenswert geringe Antriebsleistung eines solchen Drehstellers unter umständen nicht aus, um die Drosselklappe, falls sie in ihrer Ruhelage festgefroren ist, bei Inbetriebnahme der Brennkraftmaschine "loszureißen".At. Newer, electronically operating systems for mixture metering usually require a mechanical coupling between the accelerator pedal and the throttle valve. Rather, in such systems the throttle valve is driven or set by an electromotive actuator which receives control commands directly from an electronic control unit via an electrical line; For this purpose, the same electronic control unit receives the driver's request from an accelerator pedal position transmitter also via an electrical line. As an electromotive actuator. Reduced DC motors (usually in a permanently excited version) or so-called turntables come into consideration, which in principle function similarly to a moving coil measuring mechanism and in any case assume a certain position in at least one actuating winding depending on the average current strength or the duty cycle of the operating current. In order to be able to operate such rotary actuators with the lowest possible electrical power, the spring constant of the return spring of the throttle valve cannot be made arbitrarily large. On the other hand, a desirable low drive power of such a rotary actuator may not be sufficient to "tear away" the throttle valve, if it is frozen in its rest position, when the internal combustion engine is started up.
Demgegenüber leisten elektronische Systeme zur Einstellung der Drosselklappe an einer Brennkraftmaschine die Realisierung nahezu beliebiger Übersetzungen zwischen der Fahrpedalstellung und der Drosselklappenstellung, beispielsweise unter Benutzung einer in einem Digitalspeicher abgelegten Kennlinie oder eines Kennfeldes. Es ist daher Aufgabe der Erfindung in Verbindung mit zeitgemäßen elektronischen Zumeßsystemen eine einfache Einrichtung zu schaffen, welche einen zuverlässigen Antrieb einer luftzumessenden Drosselklappe einer Brennkraftmaschine mit geringer Antriebsleistung erlaubt, und die zudem das Problem einer festfrierenden Drosselklappe ausräumt. Weiter ist es Aufgabe der Erfindung, diese Einrichtung so zu gestalten, daß im Falle eines Ausfalles der Stromversorgung, des elektronischen Steuergerätes für die Drosselklappenstellung oder des die Drosselklappe einstellenden Stellers dennoch ein sicherer Notfahrbetrieb möglich ist, so daß jedenfalls der Fahrzeugführer das Fahrzeug noch zur nächsten Werkstatt fahren kann.In contrast, electronic systems for adjusting the throttle valve on an internal combustion engine provide almost any translation between the accelerator pedal position and the throttle valve position, for example using a characteristic curve or a map stored in a digital memory. It is therefore an object of the invention in connection with contemporary electronic metering systems to provide a simple device which allows a reliable drive of an air-measuring throttle valve of an internal combustion engine with low drive power, and which also eliminates the problem of a freezing throttle valve. Furthermore, it is an object of the invention to design this device so that in the event of a failure of the power supply, the electronic control unit for the throttle valve position or the actuator adjusting the throttle valve, safe emergency operation is nevertheless possible, so that the driver of the vehicle can drive the vehicle to the next Workshop can drive.
Vorteile der ErfindungAdvantages of the invention
Ein erster Vorteil der Erfindung beisteht darin, daß das Problem des Festfrierens der Drosselklappe überwunden wird, indem das Festfrieren der Drosselklappe bei abgestelltem Fahrzeug gar nicht mehr eintreten kann, weil die Drosselklappe in diesem Zustand keine Ruhelage derart einnimmt, daß sie flächig festfrieren könnte. Auf diese Weise entfällt die Bereitstellung entsprechender Spitzenantriebsleistung zum Losreißen einer flächig festgefrorenen Drosselklappe völlig, was zu einer kostengünstigen Auslegung der erforderlichen Ansteuerendstufe in einem elektronischen Steuergerät führt. Ein weiterer Vorteil der Erfindung besteht darin, daß bei Ausfall des elektronischen Steuergerätes, oder seiner Stromversorgung, oder der in diesem Steuergerät enthaltenen Ansteuerendstufe für die Drosselklappe diese aufgrund Rückführung durch eine Feder jedenfalls eine solche Ruhelage einnimmt, daß noch ausreichend Verbrennungsluft zur Aufrechterhaltung eines Notfahrbetriebs in die Brennkraftmaschine gelangen kann. Ein weiterer Vorteil der Erfindung besteht darin, daß bei Absinken der Bordnetzspannung bei Startversuchen bei niedriger Umgebungstemperatur keine zusätzliche elektrische Energie bereitgestellt werden muß, nur um ausreichend Verbrennungsluft in die Brennkraft- kraftmaschine gelangen zu lassen. Dadurch wird die Spannungslage des Bordnetzes, insbesondere bei hoher Beanspruchung der Starterbatterie verbessert.A first advantage of the invention is that the problem of freezing of the throttle valve is overcome by the freezing of the throttle valve no longer being able to occur when the vehicle is parked, because the throttle valve does not assume a rest position in this state in such a way that it could freeze flat. In this way, the provision of appropriate peak drive power to tear away a flat frozen throttle valve is completely eliminated, which leads to a cost-effective design of the required control output stage in an electronic control unit. Another advantage of the invention is that in the event of failure of the electronic control unit, or its power supply, or the control output stage for the throttle valve contained in this control unit, the latter assumes such a rest position due to recirculation by a spring that sufficient combustion air is still available to maintain emergency operation in the internal combustion engine can get. Another advantage of the invention is that when the on-board electrical system voltage drops during start-up attempts at a low ambient temperature, no additional electrical energy has to be provided, only to provide sufficient combustion air for the internal combustion engine. to get the engine. This improves the voltage level of the vehicle electrical system, especially when the starter battery is under high stress.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen der erfindungsgemäßen Einrichtung zur elektrisch gesteuerten Zumessung von Verbrennungsluft in einer Brennkraftmaschine gegeben.The measures listed in the subclaims provide advantageous developments of the device according to the invention for the electrically controlled metering of combustion air in an internal combustion engine.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen: Figur 1 ein schematisches Funktionsbild der erfindungsgemäßen Einrichtung zur elektrisch gesteuerten Zumessung von Verbren-' nungsluft in eine Brennkraftmaschine, Figur 2 ein Diagramm des prinzipiellen Verlaufs des Drehmoments eines Drosselklappendrehstellers über dem Stellungswinkel α der Drosselklappe und Figur 3 eine schematische Darstellung einer praktischen Realiserung der erfindungsgemäßen Einrichtung.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. FIG. 1 shows a schematic functional diagram of the device according to the invention for the electrically controlled metering of combustion air into an internal combustion engine, FIG. 2 shows a diagram of the basic course of the torque of a throttle valve rotary actuator over the position angle α of the throttle valve, and FIG. 3 shows a schematic illustration of a practical implementation the device according to the invention.
Beschreibung des AusführungsbeispielesDescription of the embodiment
Gemäß Figur 1 umfaßt die erfindungsgemäße Einrichtung zur elektrisch gesteuerten Zumessung von Verbrennungsluft in eine Brennkraftmaschine einen Kanal 10 zur Führung von Verbrennungsluft 28, durch den eine drehbar gelagerte Stellwelle 12 ragt, die ihrerseits eine daran befestigte und dadurch schwenkbare Drosselklappe 11 trägt. Die Stellwelle 12 wird von einem elektromotorischen Steller 13 angetrieben bzw. positioniert; die dazu notwendigen Stellsignale werden dem Drehsteller über Anschlußleitungen 14 zugeführt. Die Stellwelle 12 trägt einen Mitnehmer 18, der als bewegliches Widerlager für ein erstes Ende 17 einer RückfUhrfeder 15 dient. Das zweite Ende 16 die- ser RUckführfeder 15 ist in geeigneter Weise raumfest befestigt. Die Rückführfeder 15 erzeugt ein gewisses Rückstelldrehmoment, welches die Drosselklappe 11 in die geschlossene Stellung zurückzuführen sucht. Die Linien 26a und 26b repräsentieren diejenige Mantellinie des Verbrennungsluftkanals 10, an denen die Drosselklappe 11 in völlig geschlossenem Zustand anliegt, d.h. entlang denen die Drosselklappe längs ihres gesamten Umfanges "flächig" festfrieren könnte. Die Stellwelle 12 trägt ferner einen weiteren Mitnehmer 19- Eine zweite Gegenstellfeder 21 ist mit ihrem einen Ende 22 raumfest eingespannt; das zweite Ende 23 liegt an einem tangential zur Stellwelle 12 justierbaren Widerlager 25 an, so daß die Feder unter einer gewissen Ruhespannung steht. Der mit der Stellwelle 12 drehfest verbundene Mitnehmer 19 weist ein Widerlager 20 auf, das durch die Rückstellfeder 15 und durch das über den Mitnehmer 18 auf die Stellwelle 12 übertragene Rückstelldrehmoment gegen das ruhende Ende 23 der Gegenfeder 21 als Ruhelager geführt wird. Auf diese Weise wird erreicht, daß die Drosselklappe 11 nicht vollständig schließt und daß der elektromotorische Steller 13 ein im Vorzeichen wechselndes Drehmoment erzeugen muß, um die Drosselklappe von der maximalen Öffnung in die völlig geschlossene Lage zu verstellen, so daß deren Be- randung an den erwähnten Mantellinien 26a und 26b anliegt. Im drehmomentlosen Zustand, also bei stromlosem Steller 13, weist die Drosselklappe 11 also einen gewissen Ruheöffnungswinkel αr auf, der durch Justierung des verstellbaren Anschlagselements 25 genau einstellbar ist. Es ist ersichtlich, daß somit bei abgestelltem Fahrzeug die Drosselklappe 11 nicht entlang ihres Umfanges im Bereich der Umfangslinien 26a und 26b im völlig geschlossenen Zustand anfrieren kann; eine Verbindung besteht in diesem Falle mit dem Ver- brennungsluftkanal 10 nur über die hier nicht gezeigte Lagerung der Stellwelle 12, die jedoch auf einfache Weise gegen Festfrieren gesichert werden kann. Figur 2 veranschaulicht den Verlauf des vom elektromotorischen Steller 13 aufzubringenden normierten Drehmomentes Mc über dem Stellungswinkel α der Drosselklappe 11; beim Ruhewinkel α r der Drosselklappe erfolgt die erwähnte Richtungsumkehr des Stelldrehmomentes, so daß also der elektromotorische Steller 13, um die Drosselklappe 11 in die völlig geschlossene Lage zu bringen, ein Stelldrehmoment mit umgekehrtem Vorzeichen erzeugen muß. Die Steigung der Momentenlinie im Bereich 0 < α <α r ergibt sich durch Überlagerung der Momentenkennlinie für die Feder 15 und für die Gegenfeder 21.According to FIG. 1, the device according to the invention for the electrically controlled metering of combustion air into an internal combustion engine comprises a channel 10 for guiding combustion air 28 through which a rotatably mounted actuating shaft 12 projects, which in turn carries a throttle valve 11 which is fastened to it and thereby pivotable. The adjusting shaft 12 is driven or positioned by an electromotive actuator 13; the necessary control signals are fed to the turntable via connecting lines 14. The actuating shaft 12 carries a driver 18 which serves as a movable abutment for a first end 17 of a return spring 15. The second end 16 this water return spring 15 is fixed in a suitable manner spatially fixed. The return spring 15 generates a certain restoring torque, which the throttle valve 11 seeks to return to the closed position. The lines 26a and 26b represent that surface line of the combustion air duct 10 against which the throttle valve 11 rests in the completely closed state, ie along which the throttle valve could freeze "flat" along its entire circumference. The actuating shaft 12 also carries a further driver 19- A second counter-spring 21 is clamped with its one end 22 fixed in space; the second end 23 rests on an abutment 25 which is adjustable tangentially to the actuating shaft 12, so that the spring is under a certain rest tension. The driver 19 connected in a rotationally fixed manner to the actuating shaft 12 has an abutment 20 which is guided by the return spring 15 and by the restoring torque transmitted via the driver 18 to the actuating shaft 12 against the resting end 23 of the counter spring 21 as a rest bearing. In this way it is achieved that the throttle valve 11 does not close completely and that the electromotive actuator 13 has to generate a changing torque in order to adjust the throttle valve from the maximum opening into the completely closed position, so that its bordering on the mentioned surface lines 26a and 26b abuts. In the torque-free state, that is to say when the actuator 13 is de-energized, the throttle valve 11 thus has a certain rest opening angle α r , which can be adjusted precisely by adjusting the adjustable stop element 25. It can be seen that, when the vehicle is parked, the throttle valve 11 cannot freeze along its circumference in the region of the circumferential lines 26a and 26b in the completely closed state; in this case, there is a connection to the combustion air duct 10 only via the mounting of the actuating shaft 12, which is not shown here, but which can be secured in a simple manner against freezing. FIG. 2 illustrates the course of the normalized torque Mc to be applied by the electromotive actuator 13 over the position angle α of the throttle valve 11; at the rest angle α r of the throttle valve, the directional reversal of the actuating torque occurs, so that the electromotive actuator 13, in order to bring the throttle valve 11 into the completely closed position, must generate an actuating torque with the opposite sign. The slope of the torque line in the range 0 <α <α r is obtained by superimposing the torque characteristic for the spring 15 and for the counter spring 21.
Der Rahmen der Erfindung wird durch andersartige Ausgestaltung der Federn 15 und 21, beispielsweise in Form von Spiralfedern oder gekrümmten Streifenfedern, nicht verlassen; auch können die beschriebenen Elemente beliebigerweise entweder einseitig oder beidseitig verteilt der Drosselklappe angeordnet sein. Insbesondere können auch der Mitnehmer 18 als Widerlager für die Rückstellfeder 15 und der Mitnehmer 19 mit dem Widerlager 20 für die Gegenfeder 21 als ein einkörperliches Ganzes ausgeführt sein, indem dann beide Federn auf ein einziges, drehfest mit der Stellwelle 12 verbundenes Mitnehmerelement einwirken, wie dies in Figur 3 der Vollständigkeit halber veranschaulicht ist. The scope of the invention is not left by a different design of the springs 15 and 21, for example in the form of spiral springs or curved strip springs; the elements described can also be arranged either distributed on one side or on both sides of the throttle valve. In particular, the driver 18 can also be designed as an abutment for the return spring 15 and the driver 19 with the abutment 20 for the counter spring 21 as a single body, in that both springs act on a single, rotationally fixedly connected to the actuating shaft 12 driver element, as this is illustrated in Figure 3 for completeness.

Claims

Ansprüche Expectations
1. Einrichtung zur gesteuerten Zumessung von Verbrennungsluft in eine Brennkraftmaschine mit einem Verbrennungsluftkanal (10), mit einer im Verbrennungsluftkanal (10) angeordneten Drosselklappe (11), welche an einer drehbaren Stellwelle (12) befestigt ist, mit einer ersten Rückstellfeder (15), die einseitig raumfest befestigt ist und in dauerndem Eingriff mit der Stellwelle ein im Sinne einer Schließung der Drosselklappe gerichtetes Drehmoment in die Stellwelle einleitet, dadurch gekennzeichnet, daß ein mit der Stellwelle drehfest verbundener elektromotorischer Momenterzeuger in Form.eines Stellers vorhanden ist, daß die Drosselklappe (11) durch die Rückstellfeder (15) gegen einen durch eine Gegenfeder (21) gefederten Anschlag in eine Ruhelage kleinster Öffnung ( α r> 0) führbar ist, und daß der elektromotorische Steller zur vollständigen Schließung der Drosselklappe so ansteuerbar ist, daß er ein Drehmoment erzeugt, welches dem Drehmoment zur maximalen Öffnung der Drosselklappe entgegengesetzt ist.1. Device for the controlled metering of combustion air into an internal combustion engine with a combustion air duct (10), with a throttle valve (11) arranged in the combustion air duct (10), which is attached to a rotatable adjusting shaft (12), with a first return spring (15), which is fixed in place on one side and in continuous engagement with the actuating shaft introduces a torque directed in the sense of a closure of the throttle valve into the actuating shaft, characterized in that an electromotive torque generator in the form of an actuator which is connected in a rotationally fixed manner to the actuating shaft is present, that the throttle valve ( 11) can be guided by the return spring (15) against a stop sprung by a counter spring (21) into a rest position of the smallest opening (α r > 0), and that the electromotive actuator can be controlled to completely close the throttle valve so that it has a torque which generates the torque for maximum opening of the choke oil flap is opposite.
2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Federkonstante der Gegenfeder (21) größer als die der Rückstellfeder (15) ist.2. Device according to claim 1, characterized in that the spring constant of the counter spring (21) is greater than that of the return spring (15).
3. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Gegenfeder (21) an einem Ende raumfest befestigt ist und daß das andere Ende der Gegenfeder bei geöffneter Drosselklappe durch ein in Umfangsrichtung der Stellwelle justierbares Widerlager vorspannbar ist. 3. Device according to one of the preceding claims, characterized in that the counter spring (21) is fixed at one end and that the other end of the counter spring can be preloaded by an abutment adjustable in the circumferential direction of the actuating shaft when the throttle valve is open.
4. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, daß das justierbare Widerlager (25) insbesondere so ausgebildet ist, daß es durch seine Justierung die Festlegung des kleinsten Öffnungswinkels ( αr) der Drosselklappe (11) bei stromlosem Steiler (13) erlaubt.4. Device according to claim 3, characterized in that the adjustable abutment (25) is particularly designed so that it allows the setting of the smallest opening angle (α r ) of the throttle valve (11) with de-energized steep (13) by its adjustment.
5. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Rückstellfeder (15) und die Gegenfeder (21) auf verschiedenen Seiten der Drosselklappe (11) an der Stellwelle (12) angreifend angeordnet sind.5. Device according to one of the preceding claims, characterized in that the return spring (15) and the counter spring (21) on different sides of the throttle valve (11) on the actuating shaft (12) are arranged attacking.
6. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Einleitung des Rückstelldrehmoments von der Rückstellfeder (15) in die Stellwelle (12) durch einen Mitnehmer (18 und 19) erfolgt, der mit dem an die Gegenfeder (21) anschlagenden Mitnehmer im wesentlichen identisch ist.6. Device according to one of the preceding claims, characterized in that the introduction of the restoring torque from the return spring (15) into the actuating shaft (12) by a driver (18 and 19), which with the counter spring (21) striking driver is essentially identical.
7. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß sowohl die Rückstellfeder (15) als auch die Gegenfeder (21) auf derselben Seite der Drosselklappe an der Stellwelle (12) angreifend angeordnet sind. 7. Device according to one of the preceding claims, characterized in that both the return spring (15) and the counter spring (21) on the same side of the throttle valve on the actuating shaft (12) are arranged attacking.
EP87905601A 1986-09-13 1987-09-04 System for regulated dosing of combustion air into an internal combustion engine Expired - Lifetime EP0326553B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3631283 1986-09-13
DE3631283A DE3631283C2 (en) 1986-09-13 1986-09-13 Device for the controlled metering of combustion air in an internal combustion engine
PCT/DE1987/000404 WO1988002064A1 (en) 1986-09-13 1987-09-04 System for regulated dosing of combustion air into an internal combustion engine

Publications (3)

Publication Number Publication Date
EP0326553A1 true EP0326553A1 (en) 1989-08-09
EP0326553B1 EP0326553B1 (en) 1990-12-27
EP0326553B2 EP0326553B2 (en) 1995-11-08

Family

ID=6309579

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87905601A Expired - Lifetime EP0326553B2 (en) 1986-09-13 1987-09-04 System for regulated dosing of combustion air into an internal combustion engine

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US (1) US4947815A (en)
EP (1) EP0326553B2 (en)
JP (1) JP2865667B2 (en)
DE (2) DE3631283C2 (en)
WO (1) WO1988002064A1 (en)

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Also Published As

Publication number Publication date
JP2865667B2 (en) 1999-03-08
DE3631283A1 (en) 1988-03-24
EP0326553B1 (en) 1990-12-27
WO1988002064A1 (en) 1988-03-24
DE3767163D1 (en) 1991-02-07
US4947815A (en) 1990-08-14
EP0326553B2 (en) 1995-11-08
DE3631283C2 (en) 1999-11-25
JPH02500677A (en) 1990-03-08

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