EP0874135A2 - Internal combustion engine - Google Patents

Internal combustion engine Download PDF

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Publication number
EP0874135A2
EP0874135A2 EP98105362A EP98105362A EP0874135A2 EP 0874135 A2 EP0874135 A2 EP 0874135A2 EP 98105362 A EP98105362 A EP 98105362A EP 98105362 A EP98105362 A EP 98105362A EP 0874135 A2 EP0874135 A2 EP 0874135A2
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EP
European Patent Office
Prior art keywords
internal combustion
combustion engine
gas
gas outlet
dead center
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Granted
Application number
EP98105362A
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German (de)
French (fr)
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EP0874135A3 (en
EP0874135B1 (en
Inventor
Rainer Ballmann
Christian Enderle
Kurt Maute
Guido Vent
Jürgen Willand
Klaus Wunderlich
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Mercedes Benz Group AG
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DaimlerChrysler AG
Daimler Benz AG
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Publication of EP0874135A2 publication Critical patent/EP0874135A2/en
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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
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/04—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation using engine as brake

Definitions

  • the invention relates to an internal combustion engine according to the preamble of claim 1.
  • Deviating from this is a method from DE 42 36 009 A1 known in which the air flow through the internal combustion engine depending on a determined driving condition and independent of a fuel flow rate is controllable by the engine braking torque adjust.
  • the procedure In overrun mode, the procedure is used Thrust cut-off with a very low engine braking torque open throttle valve reached on the intake side. Is a large engine braking torque is desired, the throttle valve and possibly an idle air bypass is completely closed.
  • the method can also be used in an internal combustion engine freely selectable valve timing, for example with hydraulic or electromagnetically controlled gas exchange valves, a very low engine braking torque can be achieved when all Gas exchange valves are permanently closed. Will be a high one Engine braking torque required, the Piston all gas exchange valves kept closed, in the lower All gas exchange valves are opened briefly to the dead center Filling the combustion chamber with gas, will immediately follow all gas exchange valves of the cylinder closed again in order to compress the sucked gas to the top dead center. in the top dead center, all gas exchange valves are opened briefly, so that the piston moves the next time it moves from the top Dead center must do expansion work again.
  • the object of the invention is in an internal combustion engine of the type mentioned at the beginning improve and reduce the risk of an existing The catalyst cools down and loaded with harmful oxygen becomes.
  • the invention is based on the finding that fuel is on Walls of the inlet side and there a wall film forms. This decreases with an air flow rate if in Overrun the fuel supply is interrupted and arrives with the air flow through the engine into that Exhaust system. This leads to an increased concentration unburned hydrocarbon that pollutes the environment.
  • FIG. 1 shows an internal combustion engine 1 with four cylinders 8, which from an air manifold 17 via intake 18 and over Gas inlet valves 2 suck a fuel air mixture and over Push out gas outlet valves 3 and 19 exhaust gases via exhaust pipes.
  • the gas inlet 2 and gas outlet valves 3 of a cylinder 8 are common or preferred individually controllable by a control unit 11.
  • Fig. 2 is a cylinder pressure curve 14 of a cylinder 8 and synchronously with this, a control time curve 7 of the gas inlet valves 2 and a control timing curve 6 of the gas outlet valves 3 over four Operating phases are shown, with phase IV essentially corresponds to phase I.
  • Phase I concerns normal Driving with an activated fuel injection and Ignition and has ignition pressure peaks 15 in the cylinder 8.
  • control unit 11 detects a fuel cut-off.
  • the fuel cut-off from the control unit is advantageous 11 depending on the engine temperature of the internal combustion engine 1 measured and activated by a temperature sensor 16.
  • the gas inlet 2 and the gas outlet valves 3 are all Cylinder 8 immediately or after completing a barely running Intake or combustion process at the end of the push-out process held in the closed position. At the same time will with the closure of the gas inlet valves 2 Fuel injection and ignition interrupted. This is can be seen in Fig. 2 in the transition from phase I to phase II.
  • An increased engine braking torque and thus an effective engine braking operation can depend on different vehicle parameters initiated and regulated, for example depending on Speed, speed, inclination of the vehicle, etc.
  • According to the invention also becomes a load reduction gradient and / or a Brake signal 9 detected.
  • the load reduction gradient can be applied at the accelerator pedal 10, on an injection system or other cheap Be tapped on the internal combustion engine 1.
  • the Brake signal 9 can be binary, path or pressure proportional to Brake pedal or detected at a convenient location in the brake system be, for example, on the brake light.
  • the load withdrawal gradient and signals 9 from the braking system deliver early exact values for regulating the engine braking torque.
  • the described Parameters can be used individually or in combination to initiate and regulate the engine braking torque.
  • the engine braking torque is increased by the Compression and / or expansion work of the internal combustion engine 1 with the gas exchange valves 2, 3 converted into heat will.
  • phase II If an engine braking operation is initiated, as shown in FIG Transition from phase II to phase III is shown either the gas inlet 2 or preferably the gas outlet valves 3 reactivated while the other genus of gas exchange valves 2, 3 remains closed.
  • the opening process the gas outlet valves 3 of the respective cylinder 8 in the area of top dead center initiated.
  • the Opening process shortly before top dead center is reached initiated so that the gas outlet valve 3 after a certain Delay in the range of the maximum compression pressure 4 opens.
  • the opening process also in time in the area of top dead center be moved.
  • the closing process is preferably shortly before reaching the bottom dead center initiated by a bottom Compression pressure 5 distinguished. This ensures that the complete cylinder stroke volume at bottom dead center with exhaust gas is filled from the exhaust tract before the compression phase begins.
  • the gas outlet valve opens in the area of the top dead center 3 and the compression pressure 4 decreases suddenly, so that the compression work is converted into heat and the engine braking power increases. In the embodiment this process runs every 360 ° crank angle, i.e. with everyone Crankshaft revolution, once.
  • the engine braking torque can be changed according to the invention, by the gas inlet 2 or the gas outlet valves 3 during single or multiple crankshaft revolutions of the internal combustion engine 1 and / or in the case of one or more cylinders 8 all gas exchange valves 2, 3 remain closed.

Abstract

Die Erfindung betrifft eine Brennkraftmaschine für Fahrzeuge mit einer Schubabschaltung und einer variablen Ventilsteuerung, bei der abhängig vom Fahrzustand des Fahrzeugs im Schubbetrieb ein Motorbremsmoment über Gaseinlaß- und Gasauslaßventile einstellbar ist. Es wird vorgeschlagen, daß im Schubbetrieb stets zumindest eine Ventilgattung, alle Gaseinlaß- oder alle Gasauslaßventile, dauernd geschlossen sind. <IMAGE>The invention relates to an internal combustion engine for vehicles with a fuel cut-off and a variable valve control, in which an engine braking torque can be set via gas inlet and gas outlet valves depending on the driving state of the vehicle in overrun mode. It is proposed that at least one type of valve, all gas inlet or all gas outlet valves, are always permanently closed in overrun mode. <IMAGE>

Description

Die Erfindung betrifft eine Brennkraftmaschine nach dem Oberbegriff des Patentanspruchs 1.The invention relates to an internal combustion engine according to the preamble of claim 1.

Im Schubbetrieb können zwei grundsätzlich entgegengesetzte Aufgaben unterschieden werden, und zwar ein möglichst kleines Motorbremsmoment zu erreichen, um beispielsweise verbrauchsoptimal den Schwung des Fahrzeugs auszunutzen, und ein angemessenes Motorbremsmoment, um beispielsweise im Gefälle die übrigen Bremsfunktionen zu unterstützen.In overrun mode, two can be fundamentally opposite Tasks are distinguished, and as small as possible To achieve engine braking torque, for example to optimize consumption take advantage of the momentum of the vehicle, and an appropriate one Engine braking torque, for example, the other downhill Support braking functions.

Diese Aufgaben werden durch eine aus der DE 3428627 A1 bekannten Brennkraftmaschine gelöst. Das Motorbremsmoment ist durch eine die Abgase stauende Drosselklappe auf der Auslaßseite regelbar. Ferner ist jedem Gasauslaßventil eine Begrenzungseinrichtung zugeordnet, die verhindert, daß die Gasauslaßventile vollständig schließen. Die Gasauslaßventile werden nur soweit geschlossen, daß eine Bremswirkung erzielt wird. Die Begrenzungseinrichtung und die Drosselklappe sind durch ein bremspedalwegabhängiges verstellbares Wegeventil betätigbar.These tasks are known from DE 3428627 A1 Internal combustion engine solved. The engine braking torque is through a throttle valve stopping the exhaust gases on the exhaust side adjustable. Furthermore, each gas outlet valve is a limiting device assigned, which prevents the gas outlet valves close completely. The gas outlet valves are only so far concluded that a braking effect is achieved. The limiting device and the throttle valve are dependent on a brake pedal travel adjustable directional valve can be operated.

Abweichend davon ist aus der DE 42 36 009 A1 ein Verfahren bekannt, bei dem der Luftdurchsatz durch die Brennkraftmaschine abhängig von einem ermittelten Fahrzustand und unabhängig von einem Kraftstoffdurchsatz steuerbar ist, um das Motorbremsmoment einzustellen. Im Schubbetrieb wird mit dem Verfahren bei Schubabschaltung ein sehr geringes Motorbremsmoment mit einer offenen Drosselklappe auf der Einlaßseite erreicht. Ist ein großes Motorbremsmoment gewünscht, wird die Drosselklappe und eventuell ein Leerlaufluft-Bypass vollständig geschlossen.Deviating from this is a method from DE 42 36 009 A1 known in which the air flow through the internal combustion engine depending on a determined driving condition and independent of a fuel flow rate is controllable by the engine braking torque adjust. In overrun mode, the procedure is used Thrust cut-off with a very low engine braking torque open throttle valve reached on the intake side. Is a large engine braking torque is desired, the throttle valve and possibly an idle air bypass is completely closed.

Ferner kann mit dem Verfahren bei einer Brennkraftmaschine mit frei wählbaren Ventilsteuerzeiten, beispielsweise mit hydraulisch oder elektromagnetisch angesteuerten Gaswechselventilen, ein sehr geringes Motorbremsmoment erzielt werden, wenn alle Gaswechselventile dauernd geschlossen sind. Wird ein hohes Motorbremsmoment gewünscht, werden bei jeder Saugbewegung des Kolbens alle Gaswechselventile geschlossen gehalten, im unteren Totpunkt werden alle Gaswechselventile kurz geöffnet, um die Verbrennungskammer mit Gas zu füllen, nachfolgend werden sofort alle Gaswechselventile des Zylinders wieder geschlossen, um das angesaugte Gas zum oberen Totpunkt hin zu komprimieren. Im oberen Totpunkt werden alle Gaswechselventile kurz geöffnet, damit der Kolben schon bei der nächsten Bewegung vom oberen Totpunkt wieder Expansionsarbeit verrichten muß.The method can also be used in an internal combustion engine freely selectable valve timing, for example with hydraulic or electromagnetically controlled gas exchange valves, a very low engine braking torque can be achieved when all Gas exchange valves are permanently closed. Will be a high one Engine braking torque required, the Piston all gas exchange valves kept closed, in the lower All gas exchange valves are opened briefly to the dead center Filling the combustion chamber with gas, will immediately follow all gas exchange valves of the cylinder closed again in order to compress the sucked gas to the top dead center. in the top dead center, all gas exchange valves are opened briefly, so that the piston moves the next time it moves from the top Dead center must do expansion work again.

Die Aufgabe der Erfindung besteht darin, bei einer Brennkraftmaschine der eingangs genannten Art, die Emissionswerte zu verbessern und die Gefahr zu reduzieren, daß ein vorhandener Katalysator auskühlt und mit schädlichem Sauerstoff beladen wird.The object of the invention is in an internal combustion engine of the type mentioned at the beginning improve and reduce the risk of an existing The catalyst cools down and loaded with harmful oxygen becomes.

Die Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst, während vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung den Unteransprüchen entnommen werden können.The object is achieved by the features of the claim 1 solved, while advantageous embodiments and Further developments of the invention are taken from the subclaims can be.

Die Erfindung geht von der Erkenntnis aus, daß Kraftstoff auf Wandungen der Einlaßseite gelangt und dort einen Wandfilm bildet. Dieser baut sich mit einem Luftdurchsatz ab, wenn im Schubbetrieb die Kraftstoffzufuhr unterbrochen wird und gelangt mit dem Luftdurchsatz durch die Brennkraftmaschine in das Abgassystem. Dies führt zu einer erhöhten Konzentration an unverbranntem Kohlenwasserstoff, der die Umwelt belastet. The invention is based on the finding that fuel is on Walls of the inlet side and there a wall film forms. This decreases with an air flow rate if in Overrun the fuel supply is interrupted and arrives with the air flow through the engine into that Exhaust system. This leads to an increased concentration unburned hydrocarbon that pollutes the environment.

Dadurch, daß gemäß der Erfindung im gesamten Schubbetrieb ein Luftdurchsatz durch die Brennkraftmaschine vermieden wird, indem stets zumindest die Gaseinlaß- oder die Gasauslaßventile geschlossen sind, gelangt kein erhöhter Anteil an unverbrannten Kohlenwasserstoffen in die Umwelt. Ferner gelangt keine Frischluft in den Katalysator, die diesen auskühlen und mit einer schädlichen Sauerstoffmenge beladen könnte.Characterized in that according to the invention in the entire overrun operation Air flow through the internal combustion engine is avoided, by always at least the gas inlet or the gas outlet valves are closed, there is no increased proportion of unburned Hydrocarbons into the environment. Furthermore, no fresh air gets in in the catalyst, which cool it down and with a harmful oxygen amount.

Weitere Einzelheiten der Erfindung sowie die daraus resultierenden Vorteile sind der nachfolgenden Beschreibung eines Ausführungsbeispiels zu entnehmen.Further details of the invention and the resulting ones Advantages are the following description Inferred embodiment.

In der Beschreibung und in den Ansprüchen sind zahlreiche Merkmale im Zusammenhang dargestellt und beschrieben. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu weiteren sinnvollen Kombinationen zusammenfassen.There are numerous in the description and in the claims Features shown and described in context. Of the Those skilled in the art will expediently also individually consider and combine them into other useful combinations.

Es zeigen:

  • Fig. 1 eine Prinzipdarstellung einer Motorsteuerung,
  • Fig. 2 einen Zylinderdruckverlauf synchron zu zwei Steuerzeitverläufen von Gaseinlaß- und Gasauslaßventilen.
    • Show it:
  • 1 is a schematic diagram of an engine control,
  • Fig. 2 shows a cylinder pressure curve synchronous with two control time curves of gas inlet and gas outlet valves.

    • Fig. 1 zeigt eine Brennkraftmaschine 1 mit vier Zylindern 8, die aus einem Luftsammelrohr 17 über Ansaugstutzen 18 und über Gaseinlaßventile 2 ein Kraftstoffluftgemisch ansaugen und über Gasauslaßventile 3 und über Abgasrohre 19 Abgase ausschieben. Es sind mehrere Zylinder 8 mit jeweils mehreren Gaseinlaß- 2 und Gasauslaßventilen 3 denkbar. Die Gaseinlaß- 2 und Gasauslaßventile 3 eines Zylinders 8 sind gemeinsam oder vorzugsweise einzeln von einem Steuergerät 11 ansteuerbar.1 shows an internal combustion engine 1 with four cylinders 8, which from an air manifold 17 via intake 18 and over Gas inlet valves 2 suck a fuel air mixture and over Push out gas outlet valves 3 and 19 exhaust gases via exhaust pipes. There are several cylinders 8, each with several gas inlet 2 and gas outlet valves 3 conceivable. The gas inlet 2 and gas outlet valves 3 of a cylinder 8 are common or preferred individually controllable by a control unit 11.

    In Fig. 2 ist ein Zylinderdruckverlauf 14 eines Zylinders 8 und synchron dazu ein Steuerzeitverlauf 7 der Gaseinlaßventile 2 und ein Steuerzeitverlauf 6 der Gasauslaßventile 3 über vier Betriebsphasen dargestellt, wobei die Phase IV im wesentlichen der Phase I entspricht. Die Phase I betrifft den normalen Fahrbetrieb mit einer aktivierten Kraftstoffeinspritzung und Zündung und besitzt Zünddruckspitzen 15 im Zylinder 8.In Fig. 2 is a cylinder pressure curve 14 of a cylinder 8 and synchronously with this, a control time curve 7 of the gas inlet valves 2 and a control timing curve 6 of the gas outlet valves 3 over four Operating phases are shown, with phase IV essentially corresponds to phase I. Phase I concerns normal Driving with an activated fuel injection and Ignition and has ignition pressure peaks 15 in the cylinder 8.

    Wird in der Phase I von einem Fahrer 12 oberhalb einer durch einen Drehzahlgeber 13 erfaßten Grenzdrehzahl, welche im Bereich des Motorleerlaufs liegt, die Lastanforderung an die Brennkraftmaschine 1 über ein Gaspedal 10 in den Bereich von Leergas zurückgenommen, erkennt das Steuergerät 11 eine Schubabschaltung. Vorteilhaft wird die Schubabschaltung vom Steuergerät 11 in Abhängigkeit der Motortemperatur der Brennkraftmaschine 1 durch einen Temperaturfühler 16 gemessen und aktiviert.Is in phase I by a driver 12 above one a speed sensor 13 detected limit speed, which in Range of engine idling is the load requirement on the Internal combustion engine 1 via an accelerator pedal 10 in the range of Withdrawn empty gas, control unit 11 detects a fuel cut-off. The fuel cut-off from the control unit is advantageous 11 depending on the engine temperature of the internal combustion engine 1 measured and activated by a temperature sensor 16.

    Dabei werden die Gaseinlaß- 2 und die Gasauslaßventile 3 aller Zylinder 8 sofort bzw. nach Abschluß eines gerade noch laufenden Ansaug- bzw. Verbrennungsvorgangs mit dem Ende des Ausschiebevorgangs in der geschlossenen Stellung gehalten. Gleichzeitig wird mit der Stillegung der Gaseinlaßventile 2 die Kraftstoffeinspritzung und die Zündung unterbrochen. Dies ist in Fig. 2 im Übergang von Phase I nach Phase II zu erkennen.The gas inlet 2 and the gas outlet valves 3 are all Cylinder 8 immediately or after completing a barely running Intake or combustion process at the end of the push-out process held in the closed position. At the same time will with the closure of the gas inlet valves 2 Fuel injection and ignition interrupted. This is can be seen in Fig. 2 in the transition from phase I to phase II.

    Sind alle Gaswechselventile 2, 3 geschlossen, findet kein Luftdurchsatz durch die Zylinder 8 statt. Es wird nur noch das eingeschlossene Zylindervolumen komprimiert und expandiert, wodurch die Volumenänderungsarbeit bis auf thermische Verluste erhalten bleibt. Der Zünddruck 15 ist aufgrund fehlender Zündung auf einen Kompressionsdruck 4 am oberen Totpunkt abgefallen. Das Motorbremsmoment wird hauptsächlich durch mechanische Reibung von Kurbeltrieb und Nebenaggregaten bestimmt. Die kinetische Energie der Fahrzeugmasse wird unwesentlich durch ein Motorbremsmoment verringert, ohne daß der Antriebsstrang durch eine Kupplung, z.B. durch einen Freilauf, aufgetrennt wird.If all gas exchange valves 2, 3 are closed, none finds Air flow through the cylinder 8 instead. It will only be that enclosed cylinder volume compresses and expands, whereby the volume change work except for thermal losses preserved. The ignition pressure 15 is missing due to Ignition to a compression pressure 4 at top dead center fallen off. The engine braking torque is mainly due to mechanical friction of crank drive and auxiliary units determined. The kinetic energy of the vehicle mass becomes insignificant reduced by an engine braking torque without the Drive train through a clutch, e.g. through a freewheel, is separated.

    Ein erhöhtes Motorbremsmoment und damit ein wirksamer Motorbremsbetrieb kann abhängig von verschiedenen Fahrzeugparametern eingeleitet und geregelt werden, beispielsweise abhängig von Drehzahl, Geschwindigkeit, Neigung des Fahrzeugs usw.. Erfindungsgemäß wird zudem ein Lastrücknahmegradient und/oder ein Bremssignal 9 erfaßt. Der Lastrücknahmegradient kann am Gaspedal 10, an einer Einspritzanlage oder sonst einer günstigen Stelle an der Brennkraftmaschine 1 abgegriffen werden. Das Bremssignal 9 kann binär, weg- oder druckproportional am Bremspedal oder an einer günstigen Stelle im Bremssystem erfaßt werden, beispielsweise auch am Bremslicht. Der Lastrücknahmegradient und Signale 9 aus dem Bremssystem liefern frühzeitig exakte Werte zur Regelung des Motorbremsmoments. Die beschriebenen Parameter können einzeln oder in Kombination genutzt werden, das Motorbremsmoment einzuleiten und zu regeln.An increased engine braking torque and thus an effective engine braking operation can depend on different vehicle parameters initiated and regulated, for example depending on Speed, speed, inclination of the vehicle, etc. According to the invention also becomes a load reduction gradient and / or a Brake signal 9 detected. The load reduction gradient can be applied at the accelerator pedal 10, on an injection system or other cheap Be tapped on the internal combustion engine 1. The Brake signal 9 can be binary, path or pressure proportional to Brake pedal or detected at a convenient location in the brake system be, for example, on the brake light. The load withdrawal gradient and signals 9 from the braking system deliver early exact values for regulating the engine braking torque. The described Parameters can be used individually or in combination to initiate and regulate the engine braking torque.

    Das Motorbremsmoment wird erfindungsgemäß erhöht, indem die Kompressions- und/oder die Expansionsarbeit der Brennkraftmaschine 1 mit den Gaswechselventilen 2, 3 in Wärme umgewandelt werden.According to the invention, the engine braking torque is increased by the Compression and / or expansion work of the internal combustion engine 1 with the gas exchange valves 2, 3 converted into heat will.

    Wird ein Motorbremsbetrieb eingeleitet, wie dies in Fig. 2 im Übergang von Phase II zu Phase III gezeigt ist, werden entweder die Gaseinlaß- 2 oder vorzugsweise die Gasauslaßventile 3 wieder aktiviert, während die andere Gattung der Gaswechselventile 2, 3 geschlossen bleibt. Dabei wird der Öffnungsvorgang der Gasauslaßventile 3 des jeweiligen Zylinders 8 im Bereich des oberen Totpunktes eingeleitet. Vorzugsweise wird der Öffnungsvorgang kurz vor Erreichen des oberen Totpunktes eingeleitet, damit das Gasauslaßventil 3 nach einer gewissen Verzögerung im Bereich des maximalen Kompressionsdrucks 4 öffnet. Um das Motorbremsmoment einzustellen, kann der Öffnungsvorgang auch zeitlich im Bereich des oberen Totpunktes verschoben werden.If an engine braking operation is initiated, as shown in FIG Transition from phase II to phase III is shown either the gas inlet 2 or preferably the gas outlet valves 3 reactivated while the other genus of gas exchange valves 2, 3 remains closed. The opening process the gas outlet valves 3 of the respective cylinder 8 in the area of top dead center initiated. Preferably the Opening process shortly before top dead center is reached initiated so that the gas outlet valve 3 after a certain Delay in the range of the maximum compression pressure 4 opens. To set the engine braking torque, the opening process also in time in the area of top dead center be moved.

    Der Schließvorgang wird vorzugsweise kurz vor Erreichen des unteren Totpunktes eingeleitet, der sich durch einen unteren Kompressionsdruck 5 auszeichnet. Dadurch ist gewährleistet, daß das komplette Zylinderhubvolumen im unteren Totpunkt mit Abgas aus dem Abgastrakt befüllt wird bevor die Verdichtungsphase beginnt. Im Bereich des oberen Totpunktes öffnet das Gasauslaßventil 3 und der Kompressionsdruck 4 baut sich schlagartig ab, so daß die Kompressionsarbeit in Wärme umgewandelt wird und sich die Motorbremsleistung erhöht. Im Ausführungsbeispiel läuft dieser Vorgang alle 360° Kurbelwinkel, d.h. bei jeder Kurbelwellenumdrehung, einmal ab.The closing process is preferably shortly before reaching the bottom dead center initiated by a bottom Compression pressure 5 distinguished. This ensures that the complete cylinder stroke volume at bottom dead center with exhaust gas is filled from the exhaust tract before the compression phase begins. The gas outlet valve opens in the area of the top dead center 3 and the compression pressure 4 decreases suddenly, so that the compression work is converted into heat and the engine braking power increases. In the embodiment this process runs every 360 ° crank angle, i.e. with everyone Crankshaft revolution, once.

    Denkbar ist auch, daß im Bereich jedes oberen und jedes unteren Totpunkts kurz geöffnet und anschließend sofort wieder geschlossen wird, um die Kompressions- und die Expansionsarbeit in Wärme umzuwandeln und damit ein noch größeres Motorbremsmoment zu erhalten.It is also conceivable that in the area of each upper and each lower Dead center opened briefly and then closed again immediately will do the compression and expansion work convert into heat and thus an even greater engine braking torque to obtain.

    Das Motorbremsmoment kann erfindungsgemäß verändert werden, indem die Gaseinlaß- 2 oder die Gasauslaßventile 3 während einzelner oder mehrerer Kurbelwellenumdrehungen der Brennkraftmaschine 1 und/oder bei einem oder bei mehreren Zylindern 8 alle Gaswechselventile 2, 3 geschlossen bleiben.The engine braking torque can be changed according to the invention, by the gas inlet 2 or the gas outlet valves 3 during single or multiple crankshaft revolutions of the internal combustion engine 1 and / or in the case of one or more cylinders 8 all gas exchange valves 2, 3 remain closed.

    Erfaßt das Steuergerät 11 Signale, die für das Ende eines Motorbremsbetriebs sprechen, wie beispielsweise eine Unterbrechung des Bremssignals 9, eine Unterschreitung der Grenzdrehzahl oder eine Lastanforderung, werden die Gasauslaßventile 3 nicht mehr im unteren Totpunkt geschlossen, sondern erst im oberen Totpunkt, um schädliches Restgas im Zylinder 8 für eine nachfolgende Verbrennungseinleitung auszuschieben. Anschließend können dann zylinderselektiv die Gaseinlaßventile 2 mit der Einspritzung und Zündung aktiviert werden, um den Verbrennungsbetrieb fortzusetzen (Fig. 2 Phase III nach IV).Detects the control unit 11 signals for the end of a Engine brake operation speak, such as an interruption of the brake signal 9, falling below the limit speed or a load request, the gas exhaust valves 3 no longer closed at bottom dead center, but only at top dead center to harmful residual gas in the cylinder 8 for a subsequent combustion initiation. Subsequently can then selectively select the gas inlet valves 2 with the Injection and ignition are activated to the combustion mode to continue (Fig. 2 phase III after IV).

    Claims (8)

    Brennkraftmaschine (1) für Fahrzeuge mit einer Schubabschaltung und einer variablen Ventilsteuerung, bei der abhängig vom Fahrzustand des Fahrzeugs im Schubbetrieb ein Motorbremsmoment über Gaseinlaß- (2) und Gasauslaßventile (3) einstellbar ist, dadurch gekennzeichnet, daß im Schubbetrieb stets zumindest eine Ventilgattung, alle Gaseinlaß- (2) oder alle Gasauslaßventile (3), dauernd geschlossen sind.Internal combustion engine (1) for vehicles with a fuel cut-off and a variable valve control, depending on Driving state of the vehicle in overrun an engine braking torque is adjustable via gas inlet (2) and gas outlet valves (3), characterized in that at least always in overrun mode a valve type, all gas inlet (2) or all gas outlet valves (3) are permanently closed. Brennkraftmaschine (1) nach Anspruch 1, dadurch gekennzeichnet, daß die andere Ventilgattung, entweder die Gaseinlaß- (2) oder die Gasauslaßventile (3), im Bereich eines oberen Totpunktes einer Kolbenbewegung geöffnet und im Bereich eines unteren Totpunktes wieder geschlossen werden, während die anderen Gaswechselventile (2, 3) geschlossen bleiben.Internal combustion engine (1) according to claim 1, characterized in that that the other type of valve, either the gas inlet (2) or the gas outlet valves (3), in the area of an upper dead center open a piston movement and in the area of a lower one Dead center can be closed again while the others Gas exchange valves (2, 3) remain closed. Brennkraftmaschine (1) nach Anspruch 1, dadurch gekennzeichnet, daß eine Ventilgattung im Bereich des oberen Totpunktes und im Bereich des unteren Totpunktes der Kolbenbewegung kurz geöffnet und anschließend sofort wieder geschlossen wird.Internal combustion engine (1) according to claim 1, characterized in that that a valve type in the area of top dead center and briefly in the area of the bottom dead center of the piston movement opened and then immediately closed again. Brennkraftmaschine (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß im Schubbetrieb bei einem oder mehreren Zylindern (8) alle Gaswechselventile (2, 3) geschlossen sind.Internal combustion engine (1) according to one of the preceding claims, characterized in that in overrun at one or several cylinders (8) all gas exchange valves (2, 3) closed are. Brennkraftmaschine (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß beim Öffnen der Gaseinlaß- (2) oder der Gasauslaßventile (3) einzelne oder mehrere Umdrehungen übersprungen werden können. Internal combustion engine (1) according to one of the preceding claims, characterized in that when the gas inlet (2) or the gas outlet valves (3) one or more revolutions can be skipped. Brennkraftmaschine (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Motorbremsmoment abhängig von einem Lastrücknahmegradienten geregelt ist.Internal combustion engine (1) according to one of the preceding claims, characterized in that the engine braking torque is dependent is regulated by a load reduction gradient. Brennkraftmaschine (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Motorbremsmoment abhängig von einem Bremssignal (9) geregelt ist.Internal combustion engine (1) according to one of the preceding claims, characterized in that the engine braking torque is dependent is regulated by a brake signal (9). Brennkraftmaschine (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß Restgas bei einer erneuten Lastwiederaufnahme ausgeschoben ist.Internal combustion engine (1) according to one of the preceding claims, characterized in that residual gas at a renewed Load recovery is extended.
    EP98105362A 1997-04-23 1998-03-25 Internal combustion engine and method of operation Expired - Lifetime EP0874135B1 (en)

    Applications Claiming Priority (2)

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    DE19717068A DE19717068C1 (en) 1997-04-23 1997-04-23 Internal combustion engine for road vehicle
    DE19717068 1997-04-23

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    WO2010138108A1 (en) 2008-02-28 2010-12-02 Jacobs Vehicle Systems, Inc. Method for variable valve actuation to provide positive power and engine braking
    CN1740526B (en) * 2004-07-16 2011-06-29 Avl里斯脱有限公司 Method for operating internal combustion engine
    DE102016216116A1 (en) 2016-08-26 2018-03-01 Bayerische Motoren Werke Aktiengesellschaft Method and device for operating an internal combustion engine in overrun mode

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    FR2795133B1 (en) * 1999-06-18 2002-07-12 Renault METHOD FOR CONTROLLING A COMBUSTION ENGINE WITH A VIEW TO OBTAINING AN ENGINE BRAKE EFFECT
    DE19963929A1 (en) * 1999-12-31 2001-07-12 Bosch Gmbh Robert Method for operating an internal combustion engine, in particular a motor vehicle
    JP5907014B2 (en) 2012-09-07 2016-04-20 マツダ株式会社 Spark ignition direct injection engine
    DE102017217712A1 (en) * 2017-10-05 2019-04-11 Ford Global Technologies, Llc Method and arrangement for increasing the exhaust gas temperature of an internal combustion engine and vehicle
    DE102018128038A1 (en) * 2018-11-09 2020-05-14 Bayerische Motoren Werke Aktiengesellschaft Engine brake operation of an internal combustion engine

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    CN1740526B (en) * 2004-07-16 2011-06-29 Avl里斯脱有限公司 Method for operating internal combustion engine
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    EP2297439A1 (en) * 2008-02-28 2011-03-23 Jacobs Vehicle Systems, Inc. Method for variable valve actuation to provide positive power and engine braking
    EP2297439A4 (en) * 2008-02-28 2013-08-28 Jacobs Vehicle Systems Inc Method for variable valve actuation to provide positive power and engine braking
    DE102016216116A1 (en) 2016-08-26 2018-03-01 Bayerische Motoren Werke Aktiengesellschaft Method and device for operating an internal combustion engine in overrun mode

    Also Published As

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    ES2226020T3 (en) 2005-03-16
    EP0874135A3 (en) 1999-05-12
    DE59811815D1 (en) 2004-09-23
    EP0874135B1 (en) 2004-08-18
    DE19717068C1 (en) 1998-06-18

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