EP0027865B1 - Device for controlling the speed of a motor vehicle with a selectable number of cylinders of a multi-cylinder internal-combustion engine - Google Patents

Device for controlling the speed of a motor vehicle with a selectable number of cylinders of a multi-cylinder internal-combustion engine Download PDF

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Publication number
EP0027865B1
EP0027865B1 EP80104814A EP80104814A EP0027865B1 EP 0027865 B1 EP0027865 B1 EP 0027865B1 EP 80104814 A EP80104814 A EP 80104814A EP 80104814 A EP80104814 A EP 80104814A EP 0027865 B1 EP0027865 B1 EP 0027865B1
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Prior art keywords
fed
input
output
cylinders
position pickup
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EP80104814A
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German (de)
French (fr)
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EP0027865A1 (en
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Harald Collonia
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Mannesmann VDO AG
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Mannesmann VDO AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
    • F02D17/02—Cutting-out
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/008—Controlling each cylinder individually
    • F02D41/0087—Selective cylinder activation, i.e. partial cylinder operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F02D2041/001—Controlling intake air for engines with variable valve actuation
    • F02D2041/0012—Controlling intake air for engines with variable valve actuation with selective deactivation of cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/18—Control of the engine output torque
    • F02D2250/21—Control of the engine output torque during a transition between engine operation modes or states

Definitions

  • the invention relates to a device for regulating the driving speed of a motor vehicle with a multi-cylinder internal combustion engine according to the preamble of claim 1.
  • the actual value input of the controller is acted upon by a speed signal which limits the rate of change of the throttle valve opening angle.
  • a speed signal which limits the rate of change of the throttle valve opening angle.
  • the prior art includes various options for switching off cylinders, for example valve switching off (DE-A-27 37 613), crank drive switching off or switching off the combustion mixture supply. When the cylinder or cylinders is switched on and off, there are jumps in performance which have a disruptive effect on driving.
  • This object is achieved in that, for switching off at least one cylinder of the internal combustion engine, depending on at least one operating parameter, there are electrically controllable switch-off elements and electrical control signals for the switch-off elements generating means, which are acted upon by the output signal of the first position transmitter, and in that in the line between The output of the first position transmitter and the setpoint input of the controller are arranged as a function of the control signals for controlling the shutdown elements to generate a throttle jump.
  • the throttle valve jump or the jump of the organ influencing the fuel-air mixture can be adapted to different internal combustion engines and / or vehicles in a relatively simple manner. This enables simple optimization of the throttle valve jump. Furthermore, the storage of the optimized facilities for the different purposes is kept inexpensive.
  • the design of the device according to claim 3 provides that the throttle valve jump can be varied in such a manner depending on the speed that the speed has practically no effect on the smooth transition when switching cylinders on and off.
  • the above advantages are also achieved if not only a single switching stage is provided in which cylinders are switched on or off, but at least one further switching stage, for example for the gradual switching off of two cylinders and four cylinders of an eight-cylinder engine.
  • Claim 5 specifies a particularly inexpensive implementation of the means for generating the electrical control signals for controlling the shutdown elements.
  • the device is further configured so that with the switching on and off of cylinders, the transmission ratio of the transmission of the gaspe dalposition on the throttle valve or the organ influencing the fuel-air mixture is made possible.
  • the gear ratio between the accelerator pedal and throttle valve in partial cylinder operation can thus be adapted to the changed engine output. For example, when operating an eight-cylinder engine with four cylinders, it can be achieved that half the pedal travel is already at full throttle.
  • essentially differential amplifiers for each jump point are provided as means for changing the transmission ratio as well as for generating the throttle valve jump.
  • this differential amplifier one input of which is controlled as a function of the control signals for controlling the shutdown elements, in conjunction with the other circuit elements, the ratio of feedback resistance to input resistance of the one input is dependent on the control signals with which the base connections of the Transistors are controlled, the collector-emitter circuit is located at the input of the differential amplifier, is changed. This changes both the effective amplification of the differential amplifier by the control signals at the base connections mentioned and the setpoint signal level at the setpoint input, the controller, which determines the throttle valve position or the jump in the throttle valve.
  • 1 denotes a first electrical position transmitter, which is coupled to an accelerator pedal 2.
  • the electrical position transmitter is connected via a line 3 to a setpoint input 4 of an electrical positioner 5.
  • the actual value input of this controller is labeled 6. It is connected via a second electrical position transmitter 7, a motor 8, which adjusts a throttle valve 9.
  • the electrical controller 5 which is designed as a positioner, can contain, in a known manner, an amplifier, which is connected on the input side to a comparator for comparing the setpoint value and the actual value, and, if appropriate, internal feedback circuits.
  • the arrangement described so far belongs to a so-called electric accelerator pedal, since a change in the position of the accelerator pedal 2 is implemented by the electric controller 5 in a corresponding adjustment of the throttle valve 9.
  • the position of the throttle valve 9 is reported back to the actual value input until the actual value signal has become the same as the desired value signal at the desired value input 4.
  • the first position transmitter also feeds two differential amplifiers 10, 11, namely in their first inputs 12 and 13, respectively.
  • the second input of differential amplifiers 14 and 15 is fed with a threshold signal.
  • a voltage of a predetermined polarity only arises at the output of each differential amplifier if the output signal of the first position transmitter contains the threshold value signal U or U ? to the second input of the differential amplifier.
  • These differential amplifiers fed with threshold signals represent means for generating electrical control signals for controlling shutdown elements, which are connected to a terminal 16 for the seventh and eighth cylinders and are connected to a terminal 17 for the fifth and six cylinders. An eight-cylinder engine is assumed.
  • the switch-off elements preferably consist of solenoid valves which are assigned to the pistons of an injection pump and which belong to the corresponding cylinders.
  • Terminals 16 and 17 are connected to the collector-emitter path of a transistor 18 or 19, the base of which is fed by the output of differential amplifier 10 or 11 via a base resistor 20 or 21.
  • the outputs of the differential amplifiers 10 and 11 thus form the control signals for controlling the shutdown elements.
  • control signals are also fed into means for changing the gear ratio as a function of the activation of the shutdown elements, which at the same time cause a jump in the throttle valve when individual cylinders are switched on or off.
  • a differential amplifier 23 which is inserted into line 3.
  • a first input 24 of the differential amplifier is in conductive connection with the first electrical position transmitter 1.
  • the second input 25 of the differential amplifier is fed back to the output via a first resistor 26.
  • the second input connects two series circuits connected in parallel, each with a second or third resistor 27 or 28, to the series connection with a collector-emitter path of a transistor 29, 30.
  • the base connections of the transistors 29 and 30 are each supplied with the output signal of the differential amplifier 11 or 10 via a base resistor 20a or 21a.

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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)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Description

Die Erfindung bezieht sich auf eine Einrichtung zum Regeln der Fahrgeschwindigkeit eines Kraftfahrzeugs mit einer Mehrzylinder-Brennkraftmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to a device for regulating the driving speed of a motor vehicle with a multi-cylinder internal combustion engine according to the preamble of claim 1.

Bei bekannten Einrichtungen dieser Gattung wird auf ein Gestänge zwischen Drosselklappe und Gaspedal bzw. Einspritzpumpe und Gaspedal verzichtet. Statt dessen ist ein elektrischer Regler vorhanden, dessen Istwerteingang mit einem Signal eines mit dem Gaspedal gekuppelten ersten Stellungsgebers und dessen Sollwerteingang mit einem Signal eines mit der Drosselklappe gekuppelten zweiten Stellungsgebers beaufschlagt ist. Um zu gewährleisten, daß solche Einrichtungen auch im nicht stationären Betrieb der Brennkraftmaschine, also beispielsweise im Beschleunigungsfall oder zu Beginn und am Ende des Schubbetriebs, ein optimales Gemisch zur Erzielung eines möglichst hohen Wirkungsgrades erzeugen, wird bei einer Weiterbildung dieser Einrichtungen die Geschwindigkeit der Drosselklappenstellungsänderung nicht mehr allein von der Bedienungsperson, sondern von einer Betriebskenngröße abhängig gemacht (DE-A-2751 125). Zu diesem Zweck ist der Istwerteingang des Reglers mit einem, die Änderungsgeschwindigkeit des Drosselklappen-Öffnungswinkels begrenzenden Drehzahlsignal beaufschlagt. Zur Erzeilung eines möglichst hohen Wirkungsgrades einer Brennkraftmaschine ist es ferner bekannt, bei Mehrzylinder-Brennkraftmaschinen außerhalb des Vollastbereichs einzelne Zylinder abzuschalten. Dadurch werden die weiter betriebenen Zylinder annähernd im Vollastbereich gefahren, so daß der Wirkungsgrad ansteigt. Zum Stand der Technik gehören verschiedene Möglichkeiten der Abschaltung von' Zylindern, beispielsweise die Ventilabschaltung (DE-A-27 37 613), die Kurbeltriebsabschaltung oder die Abschaltung der Verbrennungsgemischzufuhr. Hierbei treten bei Ab- und Zuschaltung des bzw. der Zylinder Leistungssprünge auf, die sich störend auf den Fahrbetrieb auswirken.In known devices of this type, there is no linkage between the throttle valve and accelerator pedal or injection pump and accelerator pedal. Instead, there is an electrical controller, the actual value input of which is supplied with a signal from a first position transmitter coupled to the accelerator pedal and the setpoint input of which is supplied with a signal from a second position transmitter coupled to the throttle valve. In order to ensure that such devices generate an optimal mixture for achieving the highest possible efficiency even in non-stationary operation of the internal combustion engine, for example in the event of acceleration or at the beginning and at the end of overrun operation, the speed of the throttle valve position change is not in a further development of these devices made more dependent solely on the operator, but on an operating parameter (DE-A-2751 125). For this purpose, the actual value input of the controller is acted upon by a speed signal which limits the rate of change of the throttle valve opening angle. To achieve the highest possible efficiency of an internal combustion engine, it is also known to switch off individual cylinders in multi-cylinder internal combustion engines outside the full-load range. As a result, the further operated cylinders are driven approximately in the full load range, so that the efficiency increases. The prior art includes various options for switching off cylinders, for example valve switching off (DE-A-27 37 613), crank drive switching off or switching off the combustion mixture supply. When the cylinder or cylinders is switched on and off, there are jumps in performance which have a disruptive effect on driving.

Bei einer bekannten Einrichtung (US-A-3765394) werden diese Leistungssprünge dadurch zu beseitigen versucht, daß im Zeitpunkt des Leistungssprungs die Lage der Drosselklappe durch mechanische Stellmittel korrigiert wird. Eine solche Einrichtung hat jedoch den Nachteil, daß sie verhältnismäßig aufwendig ist. Zudem läßt die Genauigkeit der Kompensation noch zu wünschen übrig.In a known device (US-A-3765394) these jumps in performance are attempted to be remedied by correcting the position of the throttle valve by mechanical actuating means at the time of the jump in power. However, such a device has the disadvantage that it is relatively complex. In addition, the accuracy of the compensation leaves something to be desired.

Es ist daher Aufgabe der Erfindung, eine Einrichtung nach dem Gattungsbegriff des Anspruchs 1 so weiterzubilden, daß sie eine Zu- und Abschaltung von Zylindern unter Kompensation des dabei auftretenden Leistungsprungs durch eine Korrektur der Drosselklappe mit einem möglichst geringen Aufwand gestattet.It is therefore an object of the invention to develop a device according to the preamble of claim 1 so that it enables a connection and disconnection of cylinders while compensating for the power jump occurring by correcting the throttle valve with as little effort as possible.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß zum Abschalten mindestens eines Zylinders der Brennkraftmaschine in Abhängigkeit von mindestens einem Betriebsparameter elektrisch steuerbare Abschaltelemente und elektrische Steuersignale für die Abschaltelemente erzeugende Mittel vorhanden sind, die vom Ausgangsslgnal des ersten Stellungsgebers beaufschlagt sind, und daß in die Leitung zwischen dem Ausgang des ersten Stellungsgebers und dem Sollwerteingang des Reglers in Abhängigkeit von den Steuersignalen zur Steuerung der Abschaltelemente gesteuerte Mittel zur Erzeugung eines Drosselklappensprungs angeordnet sind.This object is achieved in that, for switching off at least one cylinder of the internal combustion engine, depending on at least one operating parameter, there are electrically controllable switch-off elements and electrical control signals for the switch-off elements generating means, which are acted upon by the output signal of the first position transmitter, and in that in the line between The output of the first position transmitter and the setpoint input of the controller are arranged as a function of the control signals for controlling the shutdown elements to generate a throttle jump.

Neben den üblicherweise zum Außerbetriebsetzen des bzw. der Zylinder verwendeten Abschaltelemente und deren Ansteuerung werden bei der erfindungsgemäßen Einrichtung zur Korrektur der Drosselklappenstellung bei einem Leistungssprung in wenig aufwendiger Weise lediglich einige elektrische Bauelemente benötigt, wie sich aus nachstehendem ohne weiteres ergibt. Mit der erfindungsgemäßen Einrichtung wird also eine rückwirkungsfreie Zylinderabschaltung geschaffen, die den bei der Ab- und Zuschaltung des Zylinders auftretenden Leistungssprung wirksam kompensiert und deren technischer Aufwand äußerst gering ist.In addition to the shutdown elements usually used for decommissioning the cylinder (s) and their activation, only a few electrical components are required in the device according to the invention for correcting the throttle valve position in the event of a power jump in a relatively simple manner, as is readily apparent from the following. With the device according to the invention, a reaction-free cylinder deactivation is thus created, which effectively compensates for the jump in performance occurring when the cylinder is switched on and off and whose technical outlay is extremely low.

Weitere zweckmäßige Merkmale sind in den abhängigen Ansprüchen angegeben.Further expedient features are specified in the dependent claims.

Durch die Massnahme nach Anspruch 2 kann der Drosselklappensprung bzw. der Sprung des das Kraftstoff-Luft-Gemisch beeinflussenden Organs in wenig aufwendiger Weise an unterschiedliche Brennkraftmaschinen und/oder Fahrzeuge angepasst werden. Dadurch ist eine einfache Optimierung des Drosselklappensprungs möglich. Ferner wird die Lagerhaltung der optimierten Einrichtungen für die unterschiedlichen Einsatzzwecke kostengünstig gehalten.As a result of the measure according to claim 2, the throttle valve jump or the jump of the organ influencing the fuel-air mixture can be adapted to different internal combustion engines and / or vehicles in a relatively simple manner. This enables simple optimization of the throttle valve jump. Furthermore, the storage of the optimized facilities for the different purposes is kept inexpensive.

Die Ausgestaltung der Einrichtung nach Anspruch 3 sieht vor, dass der Drosselklappensprung in einer solchen Weise in Abhängigkeit von der Drehzahl variiert werden kann, dass sich die Drehzahl praktisch nicht auf den glatten Übergang beim Zu- und Abschalten von Zylindern auswirkt.The design of the device according to claim 3 provides that the throttle valve jump can be varied in such a manner depending on the speed that the speed has practically no effect on the smooth transition when switching cylinders on and off.

Gemäss Anspruch 4 werden die voranstehenden Vorteile auch erzielt, wenn nicht nur eine einzige Schaltstufe vorgesehen ist, bei der Zylinder zu- bzw. abgeschaltet werden, sondern mindestens eine weitere Schaltstufe, beispielsweise zum stufenweisen Abschalten von zwei Zylindern und vier Zylindern eines AchtzylinderMotors.According to claim 4, the above advantages are also achieved if not only a single switching stage is provided in which cylinders are switched on or off, but at least one further switching stage, for example for the gradual switching off of two cylinders and four cylinders of an eight-cylinder engine.

Anspruch 5 gibt eine besonders wenig aufwendige Realisierung der Mittel zum Erzeugen der elektrischen Steuersignale zur Steuerung der Abschaltelemente an.Claim 5 specifies a particularly inexpensive implementation of the means for generating the electrical control signals for controlling the shutdown elements.

Gemäss Anspruch 6 wird die Einrichtung weiterhin so ausgestaltet, dass mit dem Zu- und Abschalten von Zylindern auch das Übersetzungsverhältnis der Übertragung der Gaspedalstellung auf die Drosselklappe bzw. das das Kraftstoff-Luft-Gemisch beeinflussende Organ ermöglicht ist. Damit kann das Übersetzungsverhältnis zwischen Gaspedal und Drosselklappe im Teilzylinderbetrieb der geänderten Motorleistung angepasst werden. Beispielsweise kann beim Betrieb eines Achtzylindermotors mit vier Zylindern erreicht werden, dass bereits bei dem halben Pedalweg mit Vollgas gefahren wird.According to claim 6, the device is further configured so that with the switching on and off of cylinders, the transmission ratio of the transmission of the gaspe dalposition on the throttle valve or the organ influencing the fuel-air mixture is made possible. The gear ratio between the accelerator pedal and throttle valve in partial cylinder operation can thus be adapted to the changed engine output. For example, when operating an eight-cylinder engine with four cylinders, it can be achieved that half the pedal travel is already at full throttle.

Gemäss Anspruch 7 werden als Mittel sowohl zum Verändern des Übersetzungsverhältnisses als auch zur Erzeugung des Drosselklappensprungs im wesentlichen Differenzverstärker für jede Sprungstelle vorgesehen. Durch diese Differenzverstärker, deren einer Eingang in Abhängigkeit von den Steuersignalen zur Steuerung der Abschaltelemente gesteuert wird, wird in Verbindung mit den übrigen Schaltungselementen erreicht, dass sich das Verhältnis von Rückkoppelungswiderstand zu Eingangswiderstand des einen Eingangs in Abhängigkeit von den Steuersignalen, mit denen die Basisanschlüsse der Transistoren gesteuert werden, deren Kollektor-Emitterkreis am Eingang des Differenzverstärkers liegt, geändert wird. Damit wird sowohl die wirksame Verstärkung des Differenzverstärkers durch die Steuersignale an den genannten Basisanschlüssen geändert als auch das Sollwert-Signalniveau an dem Sollwerteingang, des Reglers, welches die Drosselklappenstellung bzw. den Drosselklappensprung bestimmt.According to claim 7, essentially differential amplifiers for each jump point are provided as means for changing the transmission ratio as well as for generating the throttle valve jump. Through this differential amplifier, one input of which is controlled as a function of the control signals for controlling the shutdown elements, in conjunction with the other circuit elements, the ratio of feedback resistance to input resistance of the one input is dependent on the control signals with which the base connections of the Transistors are controlled, the collector-emitter circuit is located at the input of the differential amplifier, is changed. This changes both the effective amplification of the differential amplifier by the control signals at the base connections mentioned and the setpoint signal level at the setpoint input, the controller, which determines the throttle valve position or the jump in the throttle valve.

In der Zeichnung ist mit 1 ein erster elektrischer Stellungsgeber bezeichnet, der mit einem Gaspedal 2 gekuppelt ist. Der elektrische Stellungsgeber ist über eine Leitung 3 an einen Sollwerteingang 4 eines elektrischen Stellungsreglers 5 angeschlossen. Der Istwerteingang dieses Reglers ist mit 6 bezeichnet. Er steht über einen zweiten elektrischen Stellungsgeber 7, einem Motor8, in Verbindung, der eine Drosselklappe 9 verstellt.In the drawing, 1 denotes a first electrical position transmitter, which is coupled to an accelerator pedal 2. The electrical position transmitter is connected via a line 3 to a setpoint input 4 of an electrical positioner 5. The actual value input of this controller is labeled 6. It is connected via a second electrical position transmitter 7, a motor 8, which adjusts a throttle valve 9.

Der als Stellungsregler ausgebildete elektrische Regler 5 kann in bekannter Weise einen Verstärker, der mit einem Vergleicher zum Vergleich des Sollwerts und des Istwerts eingangsseitig verbunden ist und gegebenenfalls internen Rückführungen enthalten.The electrical controller 5, which is designed as a positioner, can contain, in a known manner, an amplifier, which is connected on the input side to a comparator for comparing the setpoint value and the actual value, and, if appropriate, internal feedback circuits.

Die bisher beschriebene Anordnung gehört zu einem sogenannten elektrischen Gaspedal, da eine Veränderung der Stellung des Gaspedals 2 durch den elektrischen Regler 5 in eine entsprechende Verstellung der Drosselklappe 9 umgesetzt wird. Dabei wird die Stellung der Drosselkiappe 9 zu dem Istwerteingang zurückgemeldet, bis das Istwert-Signal gleich dem Sollwert-Signal an dem Sollwerteingang 4 geworden ist.The arrangement described so far belongs to a so-called electric accelerator pedal, since a change in the position of the accelerator pedal 2 is implemented by the electric controller 5 in a corresponding adjustment of the throttle valve 9. The position of the throttle valve 9 is reported back to the actual value input until the actual value signal has become the same as the desired value signal at the desired value input 4.

Von dem ersten Stellungsgeber werden ferner zwei Differenzverstärker 10, 11 gespeist, und zwar in deren ersten Eingang 12 bzw. 13. Der jeweils zweite Eingang des Differenzverstärkers 14 bzw. 15 wird mit einem Schwellwertsignal gespeist. Dadurch entsteht an dem Ausgang jedes Differenzverstärkers nur dann eine Spannung einer vorgegebenen Polarität, wenn das Ausgangssignal des ersten Stellungsgebers das Schwellwertsignal U, bzw. U? an den jeweils zweiten Eingang des Differenzverstärkers überschreitet. Diese mit Schwellwertsignalen gespeisten Differenzverstärker stellen Mittel zur Erzeugung elektrischer Steuersignale zur Steuerung von Abschaltelementen dar, die für den siebten und achten Zylinder an einer Klemme 16 angeschlossen sind und für den fünften und sech Zylinder an einer Klemme 17 kontaktiert sind. Dabei wird von einem Achtzylinder-Motor ausgegangen. Die Abschaltelemente bestehen vorzugsweise in Magnetventilen, die den Kolben einer Einspritzpumpe zugeordnet sind, welche zu den entsprechenden Zylindern gehören. Die Klemmen 16 und 17 stehen mit der Kollektor-Emitterstrecke je eines Transistors 18 bzw. 19 in Verbindung, dessen Basis über einen Basiswiderstand 20 bzw. 21 von dem Ausgang des Differenzverstärkers 10 bzw. 11 gespeist wird. Die Ausgänge der Differenzverstärker 10 bzw. 11 bilden also die Steuersignale zur Steuerung der Abschaltelemente.The first position transmitter also feeds two differential amplifiers 10, 11, namely in their first inputs 12 and 13, respectively. The second input of differential amplifiers 14 and 15 is fed with a threshold signal. As a result, a voltage of a predetermined polarity only arises at the output of each differential amplifier if the output signal of the first position transmitter contains the threshold value signal U or U ? to the second input of the differential amplifier. These differential amplifiers fed with threshold signals represent means for generating electrical control signals for controlling shutdown elements, which are connected to a terminal 16 for the seventh and eighth cylinders and are connected to a terminal 17 for the fifth and six cylinders. An eight-cylinder engine is assumed. The switch-off elements preferably consist of solenoid valves which are assigned to the pistons of an injection pump and which belong to the corresponding cylinders. Terminals 16 and 17 are connected to the collector-emitter path of a transistor 18 or 19, the base of which is fed by the output of differential amplifier 10 or 11 via a base resistor 20 or 21. The outputs of the differential amplifiers 10 and 11 thus form the control signals for controlling the shutdown elements.

Diese Steuersignale werden ausserdem in Mittel zum Ändern des Übersetzungsverhältnisses in Abhängigkeit von der Aktivierung der Abschaltelemente eingespeist, die zugleich mit der Zu-oder Abschaltung einzelner Zylinder einen Drosselklappensprung hervorrufen.These control signals are also fed into means for changing the gear ratio as a function of the activation of the shutdown elements, which at the same time cause a jump in the throttle valve when individual cylinders are switched on or off.

Diese Mittel bestehen im wesentlichen aus einem Differenzverstärker 23, der in die Leitung 3 eingefügt ist. Dabei steht ein erster Eingang 24 des Differenzverstärkers in leitender Verbindung mit dem ersten elektrischen Stellungsgeber 1. Der zweite Eingang 25 des Differenzverstärkers ist über einen ersten Widerstand 26 mit dem Ausgang rückgekoppelt. Ausserdem stehen mit dem zweiten Eingang zwei parallel geschaltete Reihenschaltungen je eines zweiten bzw. dritten Widerstands 27 bzw. 28 mit der Reihenschaltung je einer Kollektor-Emitterstrecke eines Transistors 29, 30 in Verbindung. Die Basisanschlüsse der Transistoren 29 bzw. 30 werden über je einen Basiswiderstand 20a bzw. 21a mit dem Ausgangssignal des Differenzverstärkers 11 bzw. 10 beaufschlagt.These means essentially consist of a differential amplifier 23 which is inserted into line 3. A first input 24 of the differential amplifier is in conductive connection with the first electrical position transmitter 1. The second input 25 of the differential amplifier is fed back to the output via a first resistor 26. In addition, the second input connects two series circuits connected in parallel, each with a second or third resistor 27 or 28, to the series connection with a collector-emitter path of a transistor 29, 30. The base connections of the transistors 29 and 30 are each supplied with the output signal of the differential amplifier 11 or 10 via a base resistor 20a or 21a.

Durch die voranstehenden Mittel zum Ändern des Übersetzungsverhältnisses wird bei einer Abschaltung der siebten und achten Zylinder durch den Differenzverstärker 11, wenn also der Achtzylinder-Motor mit nur sechs Zylindern betrieben wird, ein Wert gleich der Summe der Widerstände 26 und 27, dividiert durch den Widerstandswert 27 erhalten. Wird der Differenzverstärker 10 auch zur Abschaltung des fünften und sechsten Zylinders aktiviert, so dass der Motor nur noch mit vier Zylindern läuft, so wird das Übersetzungsverhältnis der Spannungsübertragung in der Leitung 3 auf einen Wert gleich der Summe der Widerstände 26 und 28, dividiert durch den Widerstand 28 reduziert. Läuft dagegen der Motor mit allen acht Zylindern betriebsmässig, so ist das Übersetzungsverhältnis in der Leitung 3 gleich eins.By means of the above-mentioned means for changing the transmission ratio, when the seventh and eighth cylinders are switched off by the differential amplifier 11, i.e. when the eight-cylinder engine is operated with only six cylinders, a value equal to the sum of the resistors 26 and 27 divided by the resistance value 27 received. If the differential amplifier 10 is also activated to switch off the fifth and sixth cylinders, so that the engine only runs with four cylinders, the transmission ratio of the voltage transmission in line 3 is equal to the value of the sum of the resistors 26 and 28 divided by the Resistor 28 reduced. On the other hand, if the engine is operating with all eight cylinders, the transmission ratio in line 3 is one.

Bei einer Änderung des Übersetzungsverhältnisses durch die zu- oder abgeschalteten Eingangswiderstände dieses Differenzverstärkers tritt zugleich ein entsprechender Pegelsprung des Ausgangs des Differenzverstärkers ein, der einen Sollwertsprung darstellt, an dem sich das Stellorgan und damit die Drosselklappenstellung anpasst, bis Sollwert und Istwert wieder übereinstimmen.When the gear ratio changes due to the on or off on Gang resistances of this differential amplifier also occurs a corresponding level jump of the output of the differential amplifier, which represents a setpoint jump to which the actuator and thus the throttle valve position adapts until the setpoint and actual value match again.

Claims (7)

1. Apparatus for regulating the travel speed of a motor vehicle having a multi-cylinder internal combustion engine, with an electrical controller (5) whose desired value input (4) is fed with the output signal of a first electrical position pickup (1) coupled with an accelerator pedal (2) and whose actual value input (6) is fed with the output signal of a second electrical position pickup (7) which is connected with a regulating element of an electrical regulating unit (8) which is operatively connected with an element (throttle valve 9) influencing the fuel-air mixture, characterised in that for putting at least one of the cylinders of the internal combustion engine out of operation there are provided switchoff elements controllable electrically in dependence on at least one operating parameter and means (10 to 15) producing electrical control signals for the switchoff elements, the output signal of the first position pickup (1) being fed into said means, and that means (23 to 30) controlled in dependence on the control signals for controlling the switchoff elements are arranged in the line (3) between the output of the first position pickup (1) and the desired value input (4) of the controller (5), for producing a throttle valve jump.
2. Apparatus according to claim 1, characterised in that the means (23-30) for producing the throttle valve jump are electronically programmable.
3. Apparatus according to claim 1 or 2, characterised in that the means (23-30) for producing the throttle valve jump are fed with a voltage proportional to the rotational speed for varying the amount of the jump in dependence on the rotational speed.
4. Apparatus according to claim 1, characterised by constructing the means (10-15) for producing the electrical control signals for stepwise control of the switchoff elements and stepwise putting out of operation a plurality of cylinders in dependence on the output signal of the first position pickup (1).
5. Apparatus according to one of claims 1 to 4, characterised in that the means (10-15) for producing electrical signals for controlling the switchoff elements comprise a differential amplifier (10 and 11 respectively) whose first input (12 and 13 respectively) is fed with the output signal of the first position pickup (1), whose second input (14 and 15 respectively) is fed with a fixedly set threshold value signal (U2, U, respectively), and whose output is operatively connected with the switchoff elements of the cylinders (e. g. electromagnetic valves of an injection system).
6. Apparatus according -to one of claims 1 to 5, characterised by arranging in the operative connection between the output of the first position pickup (1) and the desired value input (4) of the controller (5) means for varying the transmission ratio (23-32) or the extent of transmission of the output signal of the first position pickup (1) in dependence on the actuation of the switchoff elements.
7. Apparatus according to claim 6, characterised in that as means for varying the transmission ratio and for producing the throttle valve jump (23-32) there is arranged in the line between the output of the first position pickup (1) and the desired value input (4) of the controller (5) a further differential amplifier (23) whose first input (24) is connected to the output of the first position pickup (1) and whose second input (25) is connected by way of a first resistor (26) to its output which is connected with the desired value input of the controller (5), and is switchable to zero potential through the agency of at least one series connection of in each case a second and third resistor respectively (27, 28 respectively) with a collector-emitter path of a transistor (29, 30 respectively) and that the base contacts of the transistors (29, 30 respectively) are connected to the outputs of the differential amplifiers (11 and 10 respectively) into which the threshold values are fed.
EP80104814A 1979-10-24 1980-08-14 Device for controlling the speed of a motor vehicle with a selectable number of cylinders of a multi-cylinder internal-combustion engine Expired EP0027865B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792942851 DE2942851A1 (en) 1979-10-24 1979-10-24 DEVICE FOR SWITCHING OFF AT LEAST ONE CYLINDER OF A MULTI-CYLINDER INTERNAL COMBUSTION ENGINE
DE2942851 1979-10-24

Publications (2)

Publication Number Publication Date
EP0027865A1 EP0027865A1 (en) 1981-05-06
EP0027865B1 true EP0027865B1 (en) 1984-02-29

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EP80104814A Expired EP0027865B1 (en) 1979-10-24 1980-08-14 Device for controlling the speed of a motor vehicle with a selectable number of cylinders of a multi-cylinder internal-combustion engine

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EP (1) EP0027865B1 (en)
DE (2) DE2942851A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2947688C2 (en) * 1979-11-27 1981-10-22 Daimler-Benz Ag, 7000 Stuttgart Device for regulating a multi-cylinder internal combustion engine
GB2105872A (en) * 1981-09-02 1983-03-30 Ford Motor Co Control system for an intermal combustion engine
JPS5841232A (en) * 1981-09-02 1983-03-10 Hitachi Ltd Control apparatus for fuel injection pump of the type capable of changing number of operative cylinders
DE3313038A1 (en) * 1983-04-12 1984-10-18 Robert Bosch Gmbh, 7000 Stuttgart MULTI-CYLINDER INTERNAL COMBUSTION ENGINE WITH DISABLE CYLINDER GROUPS
DE3924582C2 (en) * 1988-07-25 1995-02-09 Nissan Motor Throttle valve control device for wheel slip suppression in motor vehicles
US5374224A (en) * 1993-12-23 1994-12-20 Ford Motor Company System and method for controlling the transient torque output of a variable displacement internal combustion engine
US5431139A (en) * 1993-12-23 1995-07-11 Ford Motor Company Air induction control system for variable displacement internal combustion engine
US6808471B1 (en) * 2003-05-08 2004-10-26 General Motors Corporation Methods and apparatus for providing security for electronically-controlled cylinder activation and deactivation

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
US3765394A (en) * 1972-09-05 1973-10-16 Gen Motors Corp Split engine operation
FR2356007A1 (en) * 1976-06-24 1978-01-20 Henry Jancelin Georges Electronic control for IC engine - has throttle moved by servomotor controlled by circuit responding to various engine parameters
US4104991A (en) * 1976-08-23 1978-08-08 Ford Motor Company Circuit for controlling the operability of one or more cylinders of a multicylinder internal combustion engine
JPS5457022A (en) * 1977-10-14 1979-05-08 Nissan Motor Co Ltd Fuel supply cylinder number control system
DE2751125A1 (en) * 1977-11-16 1979-05-17 Bosch Gmbh Robert CONTROL DEVICE FOR A COMBUSTION ENGINE

Also Published As

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DE2942851A1 (en) 1981-05-07
DE3066752D1 (en) 1984-04-05
EP0027865A1 (en) 1981-05-06

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