EP0108936B1 - Electrical arrangement for the regulation of the idling of an internal-combustion engine - Google Patents

Electrical arrangement for the regulation of the idling of an internal-combustion engine Download PDF

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Publication number
EP0108936B1
EP0108936B1 EP83110206A EP83110206A EP0108936B1 EP 0108936 B1 EP0108936 B1 EP 0108936B1 EP 83110206 A EP83110206 A EP 83110206A EP 83110206 A EP83110206 A EP 83110206A EP 0108936 B1 EP0108936 B1 EP 0108936B1
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EP
European Patent Office
Prior art keywords
electromagnet
combustion engine
idling
regulation
internal
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Expired
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EP83110206A
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German (de)
French (fr)
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EP0108936A1 (en
Inventor
Stephan Wietschorke
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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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M3/00—Idling devices for carburettors
    • F02M3/06—Increasing idling speed
    • F02M3/07—Increasing idling speed by positioning the throttle flap stop, or by changing the fuel flow cross-sectional area, by electrical, electromechanical or electropneumatic means, according to engine speed
    • F02M3/075—Increasing idling speed by positioning the throttle flap stop, or by changing the fuel flow cross-sectional area, by electrical, electromechanical or electropneumatic means, according to engine speed the valve altering the fuel conduit cross-section being a slidable valve
    • 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
    • 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 an electrical arrangement for controlling the idle speed of an internal combustion engine according to the preamble of the claim.
  • the idling speed of a motor vehicle gasoline engine is carried out by controlling the air quantities on the intake side with an electromechanical actuator which comprises a valve element which limits the effective intake cross section and can be moved by an electric drive element (DE-A-2949884).
  • a lifting magnet serves as the drive element, which can adjust a piston in a cylinder against the force of a spring.
  • the solenoid is subjected to an electrical variable, the actuating voltage, as a function of the difference between the actual idling speed and the target idling speed, in order to correct this difference by influencing the intake cross section.
  • the control voltage is formed as pure direct current, for which a differential amplifier can be used.
  • the direct voltage drives a direct current in the electromagnet or the lifting magnet, which generates a power loss with the coil resistance, which is converted into heat.
  • the power loss increases with increasing number of turns and a decreasing wire cross-section and limits the usable force generated by it for given dimensions of the electromagnet.
  • the controller In order to reduce the power loss in the components of the controller which generates the speed-dependent control voltage, it can be considered to form a clocked bipolar DC voltage as the control voltage, so that the voltage-generating amplifier elements in the controller only open or block completely must be and thus implement a low power loss. If the pulsed DC voltage is applied to the electromagnet, the current runs around a DC mean value according to the compensation functions, but here, too, the ohmic resistance of the coil consumes active power, which is uselessly converted into thermal energy and limits the force that can be generated by the electromagnet .
  • the object of the present invention is therefore to create an electrical arrangement for regulating the idling speed of an internal combustion engine of the type mentioned in the introduction, in which a compact electromagnet can be operated with only a small power loss for generating a large force which can be used by the actuator.
  • the electromagnet is thus supplemented with a capacitor connected in parallel to form a parallel resonant circuit.
  • the parallel resonant circuit is operated with a special control voltage, which has a sinusoidal component with a frequency substantially equal to the resonance frequency of the parallel resonant circuit.
  • the sine component is superimposed on a DC component, the amount of which is equal to the amplitude of the sine wave.
  • the amplitude and the DC voltage component are preferably controlled as a function of the difference between the actual idling speed and the target idling speed.
  • the steep voltage contains a DC component that is superimposed on the sinusoidal excitation.
  • the direct voltage component introduces the active power into the parallel resonant circuit, which is consumed by damping the coil resistance. This maintains the oscillating state of the parallel resonant circuit.
  • the effective power loss caused by the hysteresis losses in the electromagnet is reduced, since only Rayleigh loops in a quadrant of the hysteresis characteristic curve are traversed as a result of the DC component instead of complete hysteresis loops. The magnetic losses are therefore reduced.
  • the eddy current losses are also reduced, so that the total undesired heating due to direct and alternating voltage components is low for given coil properties.
  • the coil is preferably operated below the saturation limit.
  • a valve housing 1 is provided with a cylinder 2, in which a piston 3 is displaceable.
  • the piston 3 with its piston skirt 4 and the inside of the cylinder 2 forms a gap seal.
  • lateral slots 5 are formed in the cylinder 2, which are more or less covered by the piston skirt 4.
  • the slots 5 open into an annular channel 6.
  • the valve housing 1 with the cylinder 2 forms a gas path for an air flow from an inlet side 7 via the slots 5 and the annular channel 6 to the suction side 8 on the connector 9, see arrow 10.
  • the Socket opens into an intake line 11 with a throttle valve.
  • a lifting magnet 13 serves as an electromagnet, which is connected to the piston 3 via a lifting rod 14 and adjusts the latter against the force of a spring 15.
  • the solenoid 13 is connected in parallel to a capacitor 16, the terminals 17 and 18 of which are also connected to a control voltage source, not shown.
  • the control voltage is output by a controller output block 19 - see FIG. 2.
  • the control voltage depends on the control deviation Xw , which is a measure of the difference between the actual idling speed and the target idling speed.
  • 2 shows the parallel resonant circuit which the capacitor 16 with the capacitance C forms with the lifting magnet 13, the equivalent sizes of which are shown as inductance L and effective resistance R i . This parallel resistance is tuned to resonance with the sine component of the control voltage.
  • the curve shape of the control voltage is shown in FIG. 3. It has the form: that is, it is a sinusoidal oscillation which oscillates at the direct voltage mean ü
  • the coil current which is not shown in FIG. 3, is lagged by approximately ⁇ / 2 to the sine wave.
  • both the direct voltage component and the alternating voltage component of the actuating voltage in the lifting magnet 13 cause only a slight heating, since active power, hysteresis and eddy current losses are low.

Description

Die Erfindung betrifft eine elektrische Anordnung zur Regelung der Leerlaufdrehzahl eines Verbrennungskraftstoffmotors nach dem Oberbegriff des Anspruchs.The invention relates to an electrical arrangement for controlling the idle speed of an internal combustion engine according to the preamble of the claim.

Bei einer derartigen bekannten Anordnung wird beispielsweise die Leerlaufdrehzahl eines Kraftfahrzeug-Ottomotors durch Steuerung der Luftmengen auf der Ansaugseite mit einem elektromechanischen Stellglied durchgeführt, welches ein den wirksamen Ansaugquerschnitt begrenzendes, durch ein elektrisches Antriebsglied bewegbares Ventilelement umfasst (DE-A-2949884). Als Antriebselement dient insbesondere ein Hubmagnet, der einen Kolen in einem Zylinder entgegen der Kraft einer Feder verstellen kann. Der Hubmagnet wird mit einer elektrischen Grösse, der Stell-Spannung, in Abhängigkeit von der Differenz der Ist-Leerlaufdrehzahl zu der Soll-Leerlaufdrehzahl beaufschlagt, um diese Differenz durch Beeinflussung des Ansaugquerschnittes auszuregeln. Hierzu wird die Stell-Spannung als reiner Gleichstrom gebildet, wozu ein Differenzverstärker dienen kann.In such a known arrangement, for example, the idling speed of a motor vehicle gasoline engine is carried out by controlling the air quantities on the intake side with an electromechanical actuator which comprises a valve element which limits the effective intake cross section and can be moved by an electric drive element (DE-A-2949884). In particular, a lifting magnet serves as the drive element, which can adjust a piston in a cylinder against the force of a spring. The solenoid is subjected to an electrical variable, the actuating voltage, as a function of the difference between the actual idling speed and the target idling speed, in order to correct this difference by influencing the intake cross section. For this purpose, the control voltage is formed as pure direct current, for which a differential amplifier can be used.

Durch die Gleichspannung wird jedoch in dem Elektromagneten bzw. dem Hubmagneten ein Gleichstrom getrieben, der mit dem Spulenwiderstand eine Verlustleistung erzeugt, die in Wärme umgesetzt wird. Die Verlustleistung wächst mit steigender Windungszahl und abnehmenden Drahtquerschnitt und begrenzt bei gegebenen Abmessungen des Elektromagneten die von ihm erzeugte nutzbare Kraft.However, the direct voltage drives a direct current in the electromagnet or the lifting magnet, which generates a power loss with the coil resistance, which is converted into heat. The power loss increases with increasing number of turns and a decreasing wire cross-section and limits the usable force generated by it for given dimensions of the electromagnet.

Um die Verlustleistung in den Bauelementen des Reglers zu verringern, welcher die drehzahlabhängige Stell-Spannung erzeugt, kann daran gedacht werden, als Stell-Spannung eine getaktete bipolare Gleichspannung zu bilden, so dass die die Spannung erzeugenden Verstärkerelemente in dem Regler nur vollständig geöffnet oder gesperrt sein müssen und so eine geringe Verlustleistung umsetzen. Wenn der Elektromagnet mit dieser getakteten Gleichspannung beaufschlagt wird, verläuft der Strom zwar nach Massgabe von Ausgleichsfunktionen um einen Gleichstrom-Mittelwert, auch hier verbraucht aber der ohmsche Widerstand der Spule Wirkleistung, die in thermische Energie nutzlos umgesetzt wird und die durch den Elektromagneten erzeugbare Kraft begrenzt.In order to reduce the power loss in the components of the controller which generates the speed-dependent control voltage, it can be considered to form a clocked bipolar DC voltage as the control voltage, so that the voltage-generating amplifier elements in the controller only open or block completely must be and thus implement a low power loss. If the pulsed DC voltage is applied to the electromagnet, the current runs around a DC mean value according to the compensation functions, but here, too, the ohmic resistance of the coil consumes active power, which is uselessly converted into thermal energy and limits the force that can be generated by the electromagnet .

Zu der vorliegenden Erfindung gehört daher die Aufgabe, eine elektrische Anordnung zur Regelung der Leerlaufdrehzahl eines Verbrennungskraftstoffmotors der eingangs genannten Gattung zu schaffen, in der ein kompakter Elektromagnet zur Erzeugung einer grossen für das Stellglied nutzbaren Kraft mit nur einer geringen Verlustleistung betrieben werden kann.The object of the present invention is therefore to create an electrical arrangement for regulating the idling speed of an internal combustion engine of the type mentioned in the introduction, in which a compact electromagnet can be operated with only a small power loss for generating a large force which can be used by the actuator.

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

Erfindungsgemäss wird also der Elektromagnet mit einem parallel geschalteten Kondensator zu einem Parallelschwingkreis ergänzt. Der Parallelschwingkreis wird mit einer besonderen Stell- Spannung betrieben, die einen sinusförmigen Anteil mit einer Frequenz im wesentlichen gleich der Resonanzfrequenz des Parallelschwingkreises aufweist. Der Sinusanteil ist einer Gleichspannungskomponente überlagert, deren Betrag gleich der Amplitude der Sinusschwingung ist. Vorzugsweise werden die Amplitude und der Gleichspannungsanteil in Abhängigkeit von der Differenz der Ist-Leerlaufdrehzahl zu der Soll-Leerlaufdrehzahl gesteuert.According to the invention, the electromagnet is thus supplemented with a capacitor connected in parallel to form a parallel resonant circuit. The parallel resonant circuit is operated with a special control voltage, which has a sinusoidal component with a frequency substantially equal to the resonance frequency of the parallel resonant circuit. The sine component is superimposed on a DC component, the amount of which is equal to the amplitude of the sine wave. The amplitude and the DC voltage component are preferably controlled as a function of the difference between the actual idling speed and the target idling speed.

Bei dieser Anordnung entsteht in dem in Resonanz befindlichen Parallelschwingkreis ein hoher Blindstrom, der ein entsprechend starkes Magnetfeld aufbaut, das für die durch das Stellglied nutzbare Kraft massgebend ist. Die zeitliche Veränderung des Magnetfeldes bzw. dessen Schwingen ist in dem vorliegenden Anwendungsfall besonders vorteilhaft, da hierdurch die mechanische Hysterese des elektromechanischen Stellgliedes gemindert bzw. überwunden werden kann und die Regelgenauigkeit gefördert wird. Da der in der Spule des Elektromagneten fliessende Strom zu der Stellspannung nahezu um π/2 phasenverschoben ist, entsteht trotz des hohen Stromes nur eine geringe Wirkleistung an dem ohmschen Widerstand der Spule. Die Verlustwärme ist entsprechend gering.With this arrangement, a high reactive current is generated in the resonant parallel resonant circuit, which builds up a correspondingly strong magnetic field, which is decisive for the force that can be used by the actuator. The temporal change in the magnetic field or its oscillation is particularly advantageous in the present application, since this can reduce or overcome the mechanical hysteresis of the electromechanical actuator and the control accuracy is promoted. Since the current flowing in the coil of the electromagnet is almost phase-shifted to the control voltage by π / 2, despite the high current there is only a small active power at the ohmic resistance of the coil. The heat loss is correspondingly low.

Da in dem vorliegenden Resonanzfall des Parallelschwinkreises dessen Scheinwiderstand sehr gross ist und trotzdem mit verhältnismässig geringen Stellspannungen, die wenig aufwendig mit dem Regler erzeugt werden können, grosse Stellkräfte erzielt werden sollen, enthält die Steil-Spannung eine Gleichspannungskomponente, die der sinusförmigen Anregung überlagert ist. Die Gleichspannungskomponente führt die Wirkleistung in den Parallelschwingkreis ein, die durch die Dämpfung des Spulenwiderstands verbraucht wird. Dadurch wird der schwingende Zustand des Parallelschwingkreises aufrechterhalten. Ausserdem wird der durch die Hystereseverluste in dem Elektromagneten bedingte Wirkleistungsverlust herabgesetzt, da infolge des Gleichstromanteils statt vollständiger Hystereseschleifen nur Rayleighschleifen in einem Quadranten der Hysteresekennlinie durchfahren werden. Die Ummagnetisierungsverluste sind also herabgesetzt. Die Wirbelstromverluste sind ebenfalls verringert, so dass die gesamte unerwünschte Erwärmung durch Gleich- und Wechselspannungsanteil bei gegebenen Spuleneigenschaften niedrig ist. Die Spule wird vorzugsweise unterhalb der Sättigungsgrenze betrieben.Since in the present case of resonance of the parallel oscillating circuit, its impedance is very large and nevertheless large actuating forces are to be achieved with relatively low actuating voltages that can be generated with little effort by the controller, the steep voltage contains a DC component that is superimposed on the sinusoidal excitation. The direct voltage component introduces the active power into the parallel resonant circuit, which is consumed by damping the coil resistance. This maintains the oscillating state of the parallel resonant circuit. In addition, the effective power loss caused by the hysteresis losses in the electromagnet is reduced, since only Rayleigh loops in a quadrant of the hysteresis characteristic curve are traversed as a result of the DC component instead of complete hysteresis loops. The magnetic losses are therefore reduced. The eddy current losses are also reduced, so that the total undesired heating due to direct and alternating voltage components is low for given coil properties. The coil is preferably operated below the saturation limit.

Zur weiteren Erläuterung der Erfindung wird im folgenden auf die Zeichnung mit drei Figuren Bezug genommen. Es zeigen:

  • Fig. 1 ein Ausführungsbeispiel des elektromechanischen Stellglieds mit einer Ventilanordnung in Ansaugteil eines Verbrennungskraftstoffmotors, in dem parallel zu einem Hubmagneten ein Kondensator geschaltet ist,
  • Fig. 2 ein Ersatzschaltbild des Hubmagneten mit dem Kondensator, und
  • Fig. 3 die Kurvenform der Stell-Spannung.
To further explain the invention, reference is made below to the drawing with three figures. Show it:
  • 1 shows an embodiment of the electromechanical actuator with a valve arrangement in the intake part of an internal combustion engine, in which a capacitor is connected in parallel with a lifting magnet,
  • Fig. 2 is an equivalent circuit diagram of the solenoid with the capacitor, and
  • Fig. 3 shows the curve shape of the control voltage.

In Fig. 1 ist zur Regelung der Leerlaufdrehzahl ein Ventilgehäuse 1 mit einem Zylinder 2 vorgesehen, in dem ein Kolben 3 verschiebbar ist. Der Kolben 3 bildet mit seinem Kolbenmantel 4 und der Innenseite des Zylinders 2 eine Spaltdichtung. Im Bewegungsbereich des Kolbenmantels 4 sind in dem Zylinder 2 seitliche Schlitze 5 ausgeformt, die durch den Kolbenmantel 4 mehr oder weniger abgedeckt werden. Die Schlitze 5 münden in einen Ringkanal 6. Durch das Ventilgehäuse 1 mit dem Zylinder 2 wird ein Gasweg für eine Luftströmung von einer Einlassseite 7 über die Schlitze 5 und den Ringkanal 6 zu der Ansaugseite 8 an dem Stutzen 9 gebildet, siehe Pfeil 10. Der Stutzen mündet in eine Ansaugleitung 11 mit einer Drosselklappe.In Fig. 1 is used to control the idle speed a valve housing 1 is provided with a cylinder 2, in which a piston 3 is displaceable. The piston 3 with its piston skirt 4 and the inside of the cylinder 2 forms a gap seal. In the range of motion of the piston skirt 4, lateral slots 5 are formed in the cylinder 2, which are more or less covered by the piston skirt 4. The slots 5 open into an annular channel 6. The valve housing 1 with the cylinder 2 forms a gas path for an air flow from an inlet side 7 via the slots 5 and the annular channel 6 to the suction side 8 on the connector 9, see arrow 10. The Socket opens into an intake line 11 with a throttle valve.

Zur Verstellung des Kolbens 3 dient ein Hubmagnet 13 als Elektromagnet, der über eine Hubstange 14 mit dem Kolben 3 verbunden ist und diesen entgegen der Kraft einer Feder 15 verstellt.To move the piston 3, a lifting magnet 13 serves as an electromagnet, which is connected to the piston 3 via a lifting rod 14 and adjusts the latter against the force of a spring 15.

Der Hubmagnet 13 ist parallel an einen Kondensator 16 angeschlossen, dessen Klemmen 17 und 18 ausserdem mit einer nicht dargestellten Stell-Spannungsquelle in Verbindung stehen.The solenoid 13 is connected in parallel to a capacitor 16, the terminals 17 and 18 of which are also connected to a control voltage source, not shown.

Die Stell-Spannung wird von einem Regler-Ausgangsblock 19-siehe Fig. 2-abgegeben. Die Stell-Spannung hängt dabei von der Regelabweichung Xw ab, die ein Mass für die Differenz der Ist-Leerlaufdrehzahl zu der Soll-Leerlaufdrehzahl ist. Aus Fig. 2 ergibt sich der Parallelschwingkreis, den der Kondensator 16 mit der Kapazität C mit dem Hubmagneten 13 bildet, dessen Ersatzgrössen als Induktivität L und Wirkwiderstand Ri dargestellt sind. Dieser Parallelwiderstand ist auf Resonanz mit dem Sinusanteil der Stell-Spannung abgestimmt.The control voltage is output by a controller output block 19 - see FIG. 2. The control voltage depends on the control deviation Xw , which is a measure of the difference between the actual idling speed and the target idling speed. 2 shows the parallel resonant circuit which the capacitor 16 with the capacitance C forms with the lifting magnet 13, the equivalent sizes of which are shown as inductance L and effective resistance R i . This parallel resistance is tuned to resonance with the sine component of the control voltage.

Die Kurvenform der Stell-Spannung geht aus Fig. 3 hervor. Sie hat die Form:

Figure imgb0001
das heisst, sie ist eine Sinusschwingung, die bei dem Gleichspannungs-Mittelwert ü schwingt. Der Spulenstrom, der in Fig. 3 nicht dargestellt ist, liegt um annähernd π/2 zu der Sinusschwingung nacheilend verschoben.The curve shape of the control voltage is shown in FIG. 3. It has the form:
Figure imgb0001
 that is, it is a sinusoidal oscillation which oscillates at the direct voltage mean ü The coil current, which is not shown in FIG. 3, is lagged by approximately π / 2 to the sine wave.

Wie oben dargelegt, rufen sowohl der Gleichspannungsanteil als auch der Wechselspannungsanteil der Stellspannung in dem Hubmagneten 13 nur eine geringe Erwärmung hervor, da Wirkleistungs-, Hysterese- und Wirbelstromverluste gering sind.As stated above, both the direct voltage component and the alternating voltage component of the actuating voltage in the lifting magnet 13 cause only a slight heating, since active power, hysteresis and eddy current losses are low.

Claims (1)

  1. Electrical arrangement for the regulation of the idling of an internal-combustion engine by influencing the charge with an electromechanical regulating unit which comprises an electromagnet (13) supplied with a regulating voltage dependent on rotational speed, characterised in that a regulating voltage is provided in the form of:
    Figure imgb0003
    s being the circuit frequency and u the mean value dependent on rotational speed, and that there is arranged in paralell with the electromagnet (13) a capacitor (16) with a capacitance of such a magnitude that it forms with the electromagnet (13) a paralell resonant circuit whose resonance frequency is substantially equal to s.
EP83110206A 1982-11-13 1983-10-13 Electrical arrangement for the regulation of the idling of an internal-combustion engine Expired EP0108936B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823242043 DE3242043A1 (en) 1982-11-13 1982-11-13 ELECTRICAL ARRANGEMENT FOR CONTROLLING THE IDLE SPEED OF A COMBUSTION FUEL ENGINE
DE3242043 1982-11-13

Publications (2)

Publication Number Publication Date
EP0108936A1 EP0108936A1 (en) 1984-05-23
EP0108936B1 true EP0108936B1 (en) 1986-04-23

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EP83110206A Expired EP0108936B1 (en) 1982-11-13 1983-10-13 Electrical arrangement for the regulation of the idling of an internal-combustion engine

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3929104A1 (en) * 1988-09-05 1990-03-15 Mitsubishi Electric Corp REGULATOR FOR AN INTERNAL COMBUSTION ENGINE

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3633260A1 (en) * 1986-09-30 1988-04-07 Bayerische Motoren Werke Ag CONTROL DEVICE FOR REGULATING THE IDLE AIR FOR INTERNAL COMBUSTION ENGINES
DE3909396A1 (en) * 1989-03-22 1990-10-04 Bayerische Motoren Werke Ag DEVICE FOR MEASURING THE IDLE AIR OF INTERNAL COMBUSTION ENGINES

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2940237A1 (en) * 1979-10-04 1981-04-16 Robert Bosch Gmbh, 7000 Stuttgart Automobile engine idling control - has by=pass valve across throttle flap regulated by engine temp. and revolutions
GB2069185B (en) * 1979-11-27 1984-05-02 British Leyland Cars Ltd Automatic control of engine speed
DE2949884C2 (en) * 1979-12-12 1985-05-30 Vdo Adolf Schindling Ag, 6000 Frankfurt Valve arrangement for regulating the idle speed of Otto engines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3929104A1 (en) * 1988-09-05 1990-03-15 Mitsubishi Electric Corp REGULATOR FOR AN INTERNAL COMBUSTION ENGINE

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DE3363189D1 (en) 1986-05-28
EP0108936A1 (en) 1984-05-23
DE3242043A1 (en) 1984-05-17

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