EP1767769A1 - Method for reducing the total load of the drive system of a Common Rail fuel injection system - Google Patents

Method for reducing the total load of the drive system of a Common Rail fuel injection system Download PDF

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Publication number
EP1767769A1
EP1767769A1 EP05108844A EP05108844A EP1767769A1 EP 1767769 A1 EP1767769 A1 EP 1767769A1 EP 05108844 A EP05108844 A EP 05108844A EP 05108844 A EP05108844 A EP 05108844A EP 1767769 A1 EP1767769 A1 EP 1767769A1
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EP
European Patent Office
Prior art keywords
pressure pump
high pressure
camshaft
torque
common rail
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EP05108844A
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German (de)
French (fr)
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EP1767769B1 (en
Inventor
Rainer Lach
Uwe Reuter
David Van Bebber
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Ford Global Technologies LLC
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Ford Global Technologies LLC
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Priority to EP20050108844 priority Critical patent/EP1767769B1/en
Priority to DE200550003915 priority patent/DE502005003915D1/en
Publication of EP1767769A1 publication Critical patent/EP1767769A1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M39/00Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
    • F02M39/02Arrangements of fuel-injection apparatus to facilitate the driving of pumps; Arrangements of fuel-injection pumps; Pump drives
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails

Definitions

  • the invention relates to a method for reducing the overall load of the drive system of a common rail injection system of a diesel engine.
  • a common rail injection system has a low and a high pressure part.
  • the essential components of the high pressure part are a high pressure pump, a high pressure accumulator (rail), injectors, pressure control valves and high pressure fuel lines.
  • the high pressure prevailing in the rail of the injection system is generated by a high-pressure pump.
  • the injectors inject electrically controlled fuel into the combustion chamber of the engine. It is also conceivable, however, that the injectors inject the fuel mechanically controlled into the combustion chamber of the engine.
  • the high-pressure pump and the injectors are components that have been continuously improved in recent years. For example, the EP 0 844 385 B1 and EP 1 321 662 A1 with the design of injectors for a common rail injection system.
  • the high-pressure pump for generating pressure in the rail is driven by a clutch, gear, chain or toothed belt.
  • the high-pressure pump may be integrated either directly into the drive system of the diesel engine, so that it is driven by the crankshaft, or driven by its own system of the camshaft.
  • the crankshaft drives the high pressure pump and the camshaft usually via a toothed belt or chain.
  • Object of the present invention is to propose a method for reducing the overall load of the drive system of a common rail injection system of a diesel engine.
  • the object is achieved in that at least one parameter of a high pressure pump of the common rail injection system is selected such that the order of the torque excitation of the high pressure pump is equal to the order of the torque excitation at least one camshaft, and further that the angular position of the high pressure pump so in the drive system it is chosen to at least partially cancel out oscillations of the torque at the high pressure pump and oscillations of the torque at the camshaft.
  • the invention has the advantage that vibrations in the drive system, in particular of the chain or toothed belt, are also effectively reduced and, as a result, simpler and more cost-effective tensioning and guiding elements for the chain or the belt can be used. Finally, the robustness and reliability of the drive system, in particular the chain or the belt due to the reduced vibrations improved, which makes it possible to use simpler components here also due to the lower loads.
  • the transmission ratio of the high pressure pump of the common rail injection system can be chosen such that the order of the torque excitation of the high pressure pump is equal to the order of the torque excitation of at least one camshaft.
  • the number of piston strokes of the high pressure pump of the common rail injection system can be selected such that the order of the torque excitation of the high pressure pump is equal to the order of the torque excitation of at least one camshaft.
  • the number of pistons of the high pressure pump of the common rail injection system can be selected such that the order of the torque excitation of the high pressure pump is equal to the order of the torque excitation of at least one camshaft.
  • the angular position of the high-pressure pump is chosen in particular with respect to the angular position of the camshaft.
  • the invention can be used with a high-pressure pump integrated in the drive system of the diesel engine, but also with a high-pressure pump driven by the camshaft, for example in a diesel engine with DOHC (double overhead camshaft).
  • DOHC double overhead camshaft
  • FIG. 1 schematically shows a drive system of a common rail injection system (not shown) of a diesel engine which includes a crankshaft gear 10 of a diesel engine (not shown), a drive wheel 12 for a common rail injection system (not shown), a camshaft gear 14 of a (not shown) camshaft and a drive element, for example, a chain or a toothed belt 16 includes.
  • the torque of the crankshaft 10 is transmitted via the chain or the toothed belt 16 to the drive wheel 12 of the high pressure pump and the camshaft 14.
  • a gear ratio is determined in each case by a wheel diameter and is in the case of the drive wheel 12 for the high pressure pump 2: 3 and for the camshaft 14 1: 2.
  • the torque of the camshaft has a second order vibration characteristic that can also be adjusted for the torque of the high pressure pump drive wheel 12 by the number of pistons or the piston strokes of the pump or by the gear ratio of the drive wheel 12 ,
  • the chain or the toothed belt 16 can be tensioned by one or more engagement elements or tension rollers.
  • angular positions of all rotating drive components, ie the crankshaft 10, the drive wheel 12 of the high pressure pump and the camshaft 14 are matched, for example during assembly of the diesel engine, as indicated by the reference numerals 18, 20 and 22, which designate the angular position of the crankshaft sprocket 10, the drive wheel 12 of the high-pressure pump and the camshaft sprocket 14.
  • FIG. 2 now shows the torque curve on the camshaft (solid line 24) and the high-pressure pump (dot-dash line 26) in the upper diagram.
  • the camshaft has a gear ratio of 1: 2 and generates four torque oscillations over 360 ° cam angle and 720 ° crank angle using the example of a 4-cylinder in-line engine.
  • the high-pressure pump for example, generates four characteristic torque oscillations over 720 ° crank angle in the case of three piston strokes of the pump (per revolution) and the selected gear ratio of 2: 3.
  • the illustrated course is thus over two revolutions of the crankshaft and over one revolution of the camshaft.
  • the resulting total torque of Drive system shown (dashed line 28).
  • the angular positions of the high-pressure pump and its drive wheel and the camshaft or the camshaft are aligned according to the "worst case", ie such that the total torque abruptly alternating loads (from a positive to a negative torque) with amplitudes to about 21.3 Nm causes.
  • the torque oscillations on the camshaft gear and on the drive wheel of the high-pressure pump are superimposed “constructively”, ie the two torque oscillations are in phase, resulting in a very large overall load of the drive system due to the torque oscillation resulting from the superposition.
  • the method of the present invention is applicable not only to the in-line four-cylinder in-line engine but also to all internal combustion engines having a plurality of cylinders arranged in series, such as eight-cylinder in-line engines or V-type engines as well have cylinders arranged in series.

Abstract

The method involves selecting a parameter of a high-pressure pump (12) of a common-rail-injection system in such a manner that order of torque excitation of the high-pressure pump is equal to order of torque excitation of a cam shaft (14). An angle position of the high pressure pump is selected in the drive system in such a manner that oscillation of the torque at the high pressure pump and oscillation of torque at the cam shaft are partially cancelled.

Description

Die Erfindung betrifft ein Verfahren zum Reduzieren der Gesamtbelastung des Antriebssystems eines Common-Rail-Einspritzsystems eines Dieselmotors.The invention relates to a method for reducing the overall load of the drive system of a common rail injection system of a diesel engine.

Bei Common-Rail- oder Speicher-Einspritzsystemen sind die Hochdruckerzeugung und Kraftstoffeinspritzung voneinander getrennt. Aufgrund der Entkopplung von Druckerzeugung und Einspritzung ergeben sich große Variationsmöglichkeiten der Einspritzdrücke und der Einspritzzeitpunkte. Ein Common-Rail-Einspritzsystem besitzt einen Nieder- und einen Hochdruckteil. Die wesentlichen Komponenten des Hochdruckteils sind eine Hochdruckpumpe, ein Hochdruckspeicher (Rail), Injektoren, Druckregelventile und Hochdruck-Kraftstoffleitungen. Der im Rail des Einspritzsystems vorherrschende hohe Druck wird von einer Hochdruckpumpe erzeugt. Die Injektoren injizieren elektrisch gesteuert den Kraftstoff in den Brennraum des Motors. Vorstellbar ist aber auch, daß die Injektoren den Kraftstoff mechanisch gesteuert in den Brennraum des Motors injizieren. Vor allem die Hochdruckpumpe und die Injektoren sind Komponenten, die in den letzten Jahren fortlaufend verbessert wurden. Beispielsweise befassen sich die EP 0 844 385 B1 und EP 1 321 662 A1 mit der Gestaltung von Einspritzdüsen für ein Common-Rail-Einspritzsystem.In common rail or accumulator injection systems, high pressure generation and fuel injection are separate. Due to the decoupling of pressure generation and injection, there are great possibilities for varying the injection pressures and the injection times. A common rail injection system has a low and a high pressure part. The essential components of the high pressure part are a high pressure pump, a high pressure accumulator (rail), injectors, pressure control valves and high pressure fuel lines. The high pressure prevailing in the rail of the injection system is generated by a high-pressure pump. The injectors inject electrically controlled fuel into the combustion chamber of the engine. It is also conceivable, however, that the injectors inject the fuel mechanically controlled into the combustion chamber of the engine. In particular, the high-pressure pump and the injectors are components that have been continuously improved in recent years. For example, the EP 0 844 385 B1 and EP 1 321 662 A1 with the design of injectors for a common rail injection system.

Die Hochdruckpumpe zur Druckerzeugung im Rail wird über Kupplung, Zahnrad, Kette oder Zahnriemen angetrieben. Hierzu kann die Hochdruckpumpe entweder direkt in das Antriebssystem des Dieselmotors integriert sein, so daß sie von der Kurbelwelle angetrieben wird, oder auch durch ein eigenes System von der Nockenwelle angetrieben werden. Bei einer Integration in das Antriebssystem des Dieselmotors treibt die Kurbelwelle die Hochdruckpumpe und die Nockenwelle in der Regel über einen Zahnriemen oder Kette an.The high-pressure pump for generating pressure in the rail is driven by a clutch, gear, chain or toothed belt. For this purpose, the high-pressure pump may be integrated either directly into the drive system of the diesel engine, so that it is driven by the crankshaft, or driven by its own system of the camshaft. When integrated into the drive system of the diesel engine, the crankshaft drives the high pressure pump and the camshaft usually via a toothed belt or chain.

Im Betrieb treten mehr oder weniger hohe Belastungen im Antrieb des Common-Rail-Einspritzsystems auf, die zu Schwingungen führen können, welche vor allem bei einem Riemen- oder Kettenantrieb unerwünscht sind. Die Belastungen und damit einhergehenden Schwingungen werden vor allem durch die Drehmomenterregung der Nockenwelle und der Hochdruckpumpe verursacht und bestimmen wesentlich die Zuverlässigkeit und Robustheit des Antriebssystems von Common-Rail-Einspritzsystemen. Die auftretenden Drehmomente führen zu einer zum Teil hohen Gesamtbelastung mit abrupten Lastwechseln des Antriebssystems, vor allem durch die einhergehenden Schwingungen, die zum Teil große Amplituden aufweisen.In operation, more or less high loads occur in the drive of the common-rail injection system, which can lead to vibrations, which are undesirable, especially in a belt or chain drive. The loads and associated vibrations are mainly caused by the torque excitation of the camshaft and the high-pressure pump and significantly determine the reliability and robustness of the drive system of common-rail injection systems. The torques occurring lead to a sometimes high overall load with abrupt load changes of the drive system, especially by the accompanying vibrations, which in some cases have large amplitudes.

Gerade bei in Serie gefertigten Einspritzsystemen schwanken die Belastungen jedoch stark und führen demnach zu einer hohen Varianz der Zuverlässigkeit und Robustheit des Antriebssystems für Einspritzsysteme. Grundsätzlich werden bei Riemen- oder Kettenantrieben Spannungs- und Führungselemente von Kette oder Zahnriemen für die größtmögliche Gesamtbelastung ausgelegt. Zudem müssen die Serviceintervalle für Antriebssysteme von Common-Rail-Einspritzsystemen nach dem "worst case" bemessen werden, bei dem die Gesamtbelastung im Antriebssystem eines Common-Rail-Einspritzsystems ein Maximum erreicht und die Komponenten des Systems am stärksten belastet sind.However, especially in series-produced injection systems, the loads fluctuate greatly and thus lead to a high variance of the reliability and robustness of the drive system for injection systems. For belt or chain drives, tension and guide elements of chain or toothed belt are always designed for the greatest possible total load. In addition, the service intervals for drive systems of common rail injection systems have to be dimensioned according to the "worst case", in which the total load in the drive system of a common rail injection system reaches a maximum and the components of the system are subjected to the greatest load.

Aufgabe der vorliegenden Erfindung ist es, ein Verfahren zum Reduzieren der Gesamtbelastung des Antriebssystems eines Common-Rail-Einspritzsystems eines Dieselmotors vorzuschlagen.Object of the present invention is to propose a method for reducing the overall load of the drive system of a common rail injection system of a diesel engine.

Erfindungsgemäß wird die Aufgabe dadurch gelöst, daß mindestens ein Parameter einer Hochdruckpumpe des Common-Rail-Einspritzsystems derart gewählt wird, daß die Ordnung der Drehmomenterregung der Hochdruckpumpe gleich der Ordnung der Drehmomenterregung mindestens einer Nockenwelle ist, und daß ferner die Winkelstellung der Hochdruckpumpe derart im Antriebssystem gewählt wird, daß sich Oszillationen des Drehmoments an der Hochdruckpumpe und Oszillationen des Drehmoments an der Nockenwelle zumindest teilweise auslöschen.According to the invention the object is achieved in that at least one parameter of a high pressure pump of the common rail injection system is selected such that the order of the torque excitation of the high pressure pump is equal to the order of the torque excitation at least one camshaft, and further that the angular position of the high pressure pump so in the drive system it is chosen to at least partially cancel out oscillations of the torque at the high pressure pump and oscillations of the torque at the camshaft.

Bisher war eine ausgewählte Winkelstellung der Hochdruckpumpe eines Common-Rail-Einspritzsystems im Gegensatz zu Dieselmotoren mit Verteilereinspritzpumpen keine Bedingung für den Betrieb. Versuche haben jedoch gezeigt, daß das durch die Hochdruckpumpe erzeugte Drehmoment die Gesamtbelastung des Antriebssystems eines Common-Rail-Einspritzsystems nicht unwesentlich beeinflußt. Es hat sich überraschender Weise herausgestellt, daß durch eine ausgewählte Winkelstellung der Hochdruckpumpe, insbesondere eine gezielte Abstimmung der Winkelstellungen von Hochdruckpumpe und Nockenwelle zueinander zu wesentlich geringeren Belastungen des Antriebssystems eines Common-Rail-Einspritzsystems aufgrund der Drehmomenterregungen der Hochdruckpumpe und der Nockenwelle führen kann. Von daher fließt das von der Hochdruckpumpe erzeugte Drehmoment bei der Abstimmung vorteilhaft mit ein.So far, a selected angular position of the high pressure pump of a common rail injection system, in contrast to diesel engines with distributor injection pumps was not a condition for operation. Experiments have shown, however, that the torque generated by the high-pressure pump influences the overall load of the drive system of a common rail injection system not insignificant. It has surprisingly been found that can lead to significantly lower loads of the drive system of a common rail injection system due to the torque excitations of the high-pressure pump and the camshaft by a selected angular position of the high-pressure pump, in particular a specific vote of the angular positions of the high pressure pump and camshaft. As a result, the torque generated by the high-pressure pump advantageously flows into the tuning.

Die Erfindung hat vor allem den Vorteil, daß auch Schwingungen im Antriebssystem, insbesondere von Kette oder Zahnriemen wirksam verringert werden und dadurch einfachere und kostengünstigere Spannungs- sowie Führungselemente für die Kette bzw. den Riemen eingesetzt werden können. Schließlich werden auch die Robustheit und Zuverlässigkeit des Antriebssystems, insbesondere der Kette oder des Riemens aufgrund der reduzierten Schwingungen verbessert, was es ermöglicht, auch hier aufgrund der geringeren Belastungen einfachere Bauelemente zu verwenden.Above all, the invention has the advantage that vibrations in the drive system, in particular of the chain or toothed belt, are also effectively reduced and, as a result, simpler and more cost-effective tensioning and guiding elements for the chain or the belt can be used. Finally, the robustness and reliability of the drive system, in particular the chain or the belt due to the reduced vibrations improved, which makes it possible to use simpler components here also due to the lower loads.

Als Parameter kann insbesondere das Übersetzungsverhältnis der Hochdruckpumpe des Common-Rail-Einspritzsystems derart gewählt werden, daß die Ordnung der Drehmomenterregung der Hochdruckpumpe gleich der Ordnung der Drehmomenterregung mindestens einer Nockenwelle ist.As a parameter, in particular the transmission ratio of the high pressure pump of the common rail injection system can be chosen such that the order of the torque excitation of the high pressure pump is equal to the order of the torque excitation of at least one camshaft.

Als Parameter kann auch die Anzahl der Kolbenhübe der Hochdruckpumpe des Common-Rail-Einspritzsystems derart gewählt werden, daß die Ordnung der Drehmomenterregung der Hochdruckpumpe gleich der Ordnung der Drehmomenterregung mindestens einer Nockenwelle ist.As a parameter, the number of piston strokes of the high pressure pump of the common rail injection system can be selected such that the order of the torque excitation of the high pressure pump is equal to the order of the torque excitation of at least one camshaft.

Als Parameter kann auch die Anzahl der Kolben der Hochdruckpumpe des Common-Rail-Einspritzsystems derart gewählt werden, daß die Ordnung der Drehmomenterregung der Hochdruckpumpe gleich der Ordnung der Drehmomenterregung mindestens einer Nockenwelle ist.As a parameter, the number of pistons of the high pressure pump of the common rail injection system can be selected such that the order of the torque excitation of the high pressure pump is equal to the order of the torque excitation of at least one camshaft.

Die Winkelstellung der Hochdruckpumpe wird insbesondere in Bezug auf die Winkelstellung der Nockenwelle gewählt.The angular position of the high-pressure pump is chosen in particular with respect to the angular position of the camshaft.

Grundsätzlich kann die Erfindung mit einer in das Antriebssystem des Dieselmotors integrierten Hochdruckpumpe, aber auch mit einer von der Nockenwelle angetriebenen Hochdruckpumpe, beispielsweise in einem Dieselmotor mit DOHC (double overhead camshaft) eingesetzt werden.In principle, the invention can be used with a high-pressure pump integrated in the drive system of the diesel engine, but also with a high-pressure pump driven by the camshaft, for example in a diesel engine with DOHC (double overhead camshaft).

Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen und in der folgenden Figurenbeschreibung offenbart. Es zeigen:

Fig. 1
schematisch ein Antriebssystem eines Common-Rail-Einspritzsystems eines Dieselmotors, bei dem Hochdruckpumpe und Nockenwelle von der Kurbelwelle des Motors angetrieben werden, und
Fig. 2
zwei Diagramme, in welchen der Drehmomentverlauf von Nockenwelle und Hochdruckpumpe eines Antriebssystems gemäß Fig. 1 einmal für eine "worst case" Winkelstellung und einmal für eine "best case" Winkelstellung von Kurbel-, Nockenwelle und Hochdruckpumpe dargestellt sind.
Further advantageous embodiments of the invention are disclosed in the subclaims and in the following description of the figures. Show it:
Fig. 1
schematically a drive system of a common rail injection system of a diesel engine, are driven in the high-pressure pump and the camshaft of the crankshaft of the engine, and
Fig. 2
two diagrams in which the torque curve of the camshaft and high pressure pump of a drive system according to FIG. 1 are shown once for a "worst case" angular position and once for a "best case" angular position of the crankshaft, camshaft and high pressure pump.

Fig. 1 zeigt schematisch ein Antriebssystem eines (nicht gezeigten) Common-Rail-Einspritzsystems eines Dieselmotors, welches ein Kurbelwellenrad 10 eines (nicht gezeigten) Dieselmotors, ein Antriebsrad 12 für eine (nicht gezeigte) Hochdruckpumpe des Common-Rail-Einspritzsystems, ein Nockenwellenrad 14 einer (nicht dargestellten) Nockenwelle und ein Antriebselement beispielsweise eine Kette oder einen Zahnriemen 16 umfasst. Das Drehmoment des Kurbelwellenrads 10 wird über die Kette bzw. den Zahnriemen 16 auf das Antriebsrad 12 der Hochdruckpumpe und das Nockenwellenrad 14 übertragen.1 schematically shows a drive system of a common rail injection system (not shown) of a diesel engine which includes a crankshaft gear 10 of a diesel engine (not shown), a drive wheel 12 for a common rail injection system (not shown), a camshaft gear 14 of a (not shown) camshaft and a drive element, for example, a chain or a toothed belt 16 includes. The torque of the crankshaft 10 is transmitted via the chain or the toothed belt 16 to the drive wheel 12 of the high pressure pump and the camshaft 14.

Ein Übersetzungsverhältnis wird jeweils von einem Raddurchmesser bestimmt und beträgt im Fall des Antriebsrads 12 für die Hochdruckpumpe 2:3 und für das Nockenwellenrad 14 1:2. Im Falle eines 4-Zylinder Reihenmotors zum Beispiel hat das Drehmoment der Nockenwelle eine Schwingungscharakteristik in zweiter Ordnung, die auch für das Drehmoment des Antriebsrads 12 der Hochdruckpumpe durch die Anzahl der Kolben oder der Kolbenhübe der Pumpe oder durch das Übersetzungsverhältnis des Antriebsrads 12 eingestellt werden kann. Die Kette bzw. der Zahnriemen 16 kann durch ein oder mehrere Einrückelemente oder Spannrollen gespannt werden.A gear ratio is determined in each case by a wheel diameter and is in the case of the drive wheel 12 for the high pressure pump 2: 3 and for the camshaft 14 1: 2. For example, in the case of a 4-cylinder in-line engine, the torque of the camshaft has a second order vibration characteristic that can also be adjusted for the torque of the high pressure pump drive wheel 12 by the number of pistons or the piston strokes of the pump or by the gear ratio of the drive wheel 12 , The chain or the toothed belt 16 can be tensioned by one or more engagement elements or tension rollers.

Um eine möglichst geringe Belastung aufgrund der oszillierenden Drehmomente des Antriebsrads 12 der Hochdruckpumpe und des Nockenwellenrads 14 zu erzielen, werden beispielsweise bei der Montage des Dieselmotors Winkelstellungen aller rotierender Antriebskomponenten, also des Kurbelwellenrads 10, des Antriebsrads 12 der Hochdruckpumpe und des Nockenwellenrads 14 aufeinander abgestimmt, wie durch die Bezugsziffern 18, 20 und 22 angedeutet ist, welche die Winkelstellung des Kurbelwellenrads 10, des Antriebsrads 12 der Hochdruckpumpe und des Nockenwellenrads 14 bezeichnen.In order to achieve the lowest possible load due to the oscillating torques of the drive wheel 12 of the high pressure pump and the camshaft 14, angular positions of all rotating drive components, ie the crankshaft 10, the drive wheel 12 of the high pressure pump and the camshaft 14 are matched, for example during assembly of the diesel engine, as indicated by the reference numerals 18, 20 and 22, which designate the angular position of the crankshaft sprocket 10, the drive wheel 12 of the high-pressure pump and the camshaft sprocket 14.

Fig. 2 zeigt nun im oberen Diagramm den Drehmomentverlauf an der Nockenwelle (durchgezogene Linie 24) und der Hochdruckpumpe (strich-punktierte Linie 26). Die Nockenwelle weist ein Übersetzungsverhältnis von 1:2 auf und erzeugt am Beispiel eines 4-Zylinder Reihenmotors vier Drehmomentoszillationen über 360° Nockenwinkel bzw. 720° Kurbelwinkel. Die Hochdruckpumpe hingegen erzeugt beispielsweise bei drei Kolbenhüben der Pumpe (pro Umdrehung) sowie dem gewähltem Übersetzungsverhältnis von 2:3 auch vier charakteristische Drehmomentoszillationen über 720° Kurbelwinkel. Der dargestellte Verlauf geht somit über zwei Umdrehungen der Kurbelwelle und über eine Umdrehung der Nockenwelle. Ferner ist im Diagramm das resultierende Gesamtdrehmoment des Antriebssystems dargestellt (gestrichelte Linie 28). Beim dargestellten exemplarischen Verlauf sind die Winkelstellungen der Hochdruckpumpe bzw. ihres Antriebsrads sowie der Nockenwelle bzw. des Nockenwellenrads gemäß dem "worst case" ausgerichtet, d.h. derart, daß das Gesamtdrehmoment abrupt abwechselnde Lasten (von einem positiven zu einem negativen Drehmoment) mit Amplituden bis etwa 21,3 Nm bewirkt. Im "worst case" überlagern sich die Drehmomentoszillationen am Nockenwellenrad und am Antriebsrad der Hochdruckpumpe "konstruktiv", d.h. die beiden Drehmomentoszillationen sind in Phase, wodurch sich eine sehr große Gesamtbelastung des Antriebssystems aufgrund der aus der Überlagerung resultierenden Drehmomentoszillation ergibt.FIG. 2 now shows the torque curve on the camshaft (solid line 24) and the high-pressure pump (dot-dash line 26) in the upper diagram. The camshaft has a gear ratio of 1: 2 and generates four torque oscillations over 360 ° cam angle and 720 ° crank angle using the example of a 4-cylinder in-line engine. By contrast, the high-pressure pump, for example, generates four characteristic torque oscillations over 720 ° crank angle in the case of three piston strokes of the pump (per revolution) and the selected gear ratio of 2: 3. The illustrated course is thus over two revolutions of the crankshaft and over one revolution of the camshaft. Furthermore, in the diagram, the resulting total torque of Drive system shown (dashed line 28). In the illustrated exemplary course, the angular positions of the high-pressure pump and its drive wheel and the camshaft or the camshaft are aligned according to the "worst case", ie such that the total torque abruptly alternating loads (from a positive to a negative torque) with amplitudes to about 21.3 Nm causes. In the worst case, the torque oscillations on the camshaft gear and on the drive wheel of the high-pressure pump are superimposed "constructively", ie the two torque oscillations are in phase, resulting in a very large overall load of the drive system due to the torque oscillation resulting from the superposition.

Im unteren Diagramm von Figur 2 ist wiederum der Drehmomentverlauf an der Nockenwelle (durchgezogene Linie 24) und der Hochdruckpumpe (strich-punktierte Linie 26) dargestellt, wobei nun die Winkelstellungen der Hochdruckpumpe bzw. des Antriebsrads davon und der Nockenwelle bzw. des Nockenwellenrads gemäß dem "best case" wie von der Erfindung vorgeschlagen ausgerichtet sind. Bei drei Kolbenhüben der Pumpe (pro Umdrehung) beispielsweise ergibt sich ein Übersetzungsverhältnis von 2:3. Hier sind nun die Drehmomentoszillationen am Nockenwellenrad und am Antriebsrad der Hochdruckpumpe zueinander in der Phase derart verschoben, daß sie sich zumindest teilweise auslöschen. Im Unterschied zum oberen Diagramm zeigt nun der Verlauf des Gesamtdrehmoments (gestrichelte Linie 28), daß eine "leicht pulsierende" Gesamtbelastung ohne abrupte Lastwechsel mit Amplituden bis etwa 13,9 Nm wirkt.In the lower diagram of FIG. 2, the torque curve on the camshaft (solid line 24) and the high-pressure pump (dashed-dotted line 26) are again shown, with the angular positions of the high-pressure pump or the drive wheel thereof and the camshaft or camshaft wheel according to FIG "Best case" as proposed by the invention are aligned. With three piston strokes of the pump (per revolution), for example, results in a gear ratio of 2: 3. Here are now the torque oscillations on the camshaft and the drive wheel of the high-pressure pump to each other in the phase shifted so that they cancel out at least partially. In contrast to the upper diagram, the course of the total torque (dashed line 28) shows that a "slightly pulsating" total load without abrupt load changes with amplitudes up to about 13.9 Nm acts.

Insgesamt hat sich gezeigt, daß durch die Abstimmung der Winkeleinstellung nicht nur der Kurbel- und Nockenwelle sondern auch des Antriebsrads der Hochdruckpumpe bzw. der Hochdruckpumpe eine Verringerung der Gesamtbelastung des Antriebssystems eines Common-Rail-Einspritzsystems eines Dieselmotors erzielen läßt. Versuche haben eine Verringerung um bis zu etwa 35 % ergeben, bei "weicheren" Lastwechseln der Gesamtbelastung.Overall, it has been shown that can achieve a reduction of the total load of the drive system of a common rail injection system of a diesel engine by tuning the angle adjustment not only the crankshaft and camshaft but also the drive of the high pressure pump and the high pressure pump. Experiments have shown a reduction of up to about 35%, with "softer" load changes of the total load.

Selbstverständlich ist das erfindungsgemäße Verfahren nicht nur bei dem beispielhaft genannten Vier-Zylinder-Reihenmotor anwendbar, sondern natürlich auch bei allen Verbrennungsmotoren, die eine Vielzahl von in Reihe angeordneten Zylindern aufweisen, wie zum Beispiel Acht-Zylinder-Reihenmotoren oder V-Motoren, die ebenfalls in Reihe angeordnete Zylinder haben.Of course, the method of the present invention is applicable not only to the in-line four-cylinder in-line engine but also to all internal combustion engines having a plurality of cylinders arranged in series, such as eight-cylinder in-line engines or V-type engines as well have cylinders arranged in series.

Claims (7)

Verfahren zum Reduzieren der Gesamtbelastung des Antriebssystems eines Common-Rail-Einspritzsystems eines Dieselmotors,
dadurch gekennzeichnet, daß
mindestens ein Parameter einer Hochdruckpumpe des Common-Rail-Einspritzsystems derart gewählt wird, daß die Ordnung der Drehmomenterregung der Hochdruckpumpe gleich der Ordnung der Drehmomenterregung mindestens einer Nockenwelle ist, und die Winkelstellung der Hochdruckpumpe derart im Antriebssystem gewählt wird, daß sich Oszillationen des Drehmoments an der Hochdruckpumpe und Oszillationen des Drehmoments an der Nockenwelle zumindest teilweise auslöschen.
Method for reducing the overall load of the drive system of a common-rail injection system of a diesel engine,
characterized in that
at least one parameter of a high pressure pump of the common rail injection system is selected such that the order of the torque excitation of the high pressure pump is equal to the order of the torque excitation of at least one camshaft, and the angular position of the high pressure pump is selected in the drive system such that oscillations of the torque at the High pressure pump and oscillations of the torque on the camshaft at least partially extinguish.
Verfahren nach Anspruch 1,
dadurch gekennzeichnet, daß
als Parameter das Übersetzungsverhältnis der Hochdruckpumpe des Common-Rail-Einspritzsystems derart gewählt wird, daß die Ordnung der Drehmomenterregung der Hochdruckpumpe gleich der Ordnung der Drehmomenterregung mindestens einer Nockenwelle ist.
Method according to claim 1,
characterized in that
as a parameter, the transmission ratio of the high pressure pump of the common rail injection system is selected such that the order of the torque excitation of the high pressure pump is equal to the order of the torque excitation of at least one camshaft.
Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß
als Parameter die Anzahl der Kolbenhübe der Hochdruckpumpe des Common-Rail-Einspritzsystems derart gewählt wird, daß die Ordnung der Drehmomenterregung der Hochdruckpumpe gleich der Ordnung der Drehmomenterregung mindestens einer Nockenwelle ist.
Method according to claim 1 or 2,
characterized in that
as a parameter, the number of piston strokes of the high pressure pump of the common rail injection system is selected such that the order of the torque excitation of the high pressure pump is equal to the order of the torque excitation of at least one camshaft.
Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß
als Parameter die Anzahl der Kolben der Hochdruckpumpe des Common-Rail-Einspritzsystems derart gewählt wird, daß die Ordnung der Drehmomenterregung der Hochdruckpumpe gleich der Ordnung der Drehmomenterregung mindestens einer Nockenwelle ist.
Method according to one of the preceding claims,
characterized in that
as a parameter, the number of pistons of the high pressure pump of the common rail injection system is selected such that the order of the torque excitation of the high pressure pump is equal to the order of the torque excitation of at least one camshaft.
Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß
die Winkelstellung der Hochdruckpumpe in Bezug auf die Winkelstellung der Nockenwelle gewählt wird.
Method according to one of the preceding claims,
characterized in that
the angular position of the high pressure pump is selected with respect to the angular position of the camshaft.
Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß
die Hochdruckpumpe in das Antriebssystem des Common-Rail-Einspritzsystems des Dieselmotors integriert ist.
Method according to one of the preceding claims,
characterized in that
the high pressure pump is integrated into the drive system of the common rail injection system of the diesel engine.
Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß
die Hochdruckpumpe von der Nockenwelle angetrieben wird.
Method according to one of the preceding claims,
characterized in that
the high-pressure pump is driven by the camshaft.
EP20050108844 2005-09-26 2005-09-26 Method for reducing the total load of the drive system of a Common Rail fuel injection system Active EP1767769B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20050108844 EP1767769B1 (en) 2005-09-26 2005-09-26 Method for reducing the total load of the drive system of a Common Rail fuel injection system
DE200550003915 DE502005003915D1 (en) 2005-09-26 2005-09-26 Method for reducing the overall load of the drive system of a common rail injection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20050108844 EP1767769B1 (en) 2005-09-26 2005-09-26 Method for reducing the total load of the drive system of a Common Rail fuel injection system

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EP1767769B1 EP1767769B1 (en) 2008-04-30

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WO2012116854A1 (en) * 2011-03-01 2012-09-07 Robert Bosch Gmbh Method for controlling an internal combustion engine

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DE102010026857A1 (en) 2010-07-12 2012-01-12 Schaeffler Technologies Gmbh & Co. Kg Arrangement for transferring driving power from cam shaft to e.g. 4-cylinder double overhead-camshaft inline engine, of diesel engine over e.g. traction mechanism gear, has train comprising non-circular wheel for reduction of fluctuations
DE102010054405A1 (en) 2010-12-14 2012-06-14 Schaeffler Technologies Gmbh & Co. Kg Arrangement for transferring driving power from e.g. camshaft to piston double stroke high pressure fuel pump of diesel engine, has gear train comprising non-circular wheel, where fuel pump drives torque fluctuations to camshaft

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FR2608219A1 (en) * 1986-12-11 1988-06-17 Daimler Benz Ag Drive for IC engine fuel pump - has floating flow regulator connection linking chain-drive wheel to engine camshaft, with smoothing flywheel
EP0849438A1 (en) * 1996-12-19 1998-06-24 Toyota Jidosha Kabushiki Kaisha Valve train in internal combustion engine
EP0902181A2 (en) * 1997-09-11 1999-03-17 Denso Corporation Variable-discharge-rate high-pressure pump

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FR2608219A1 (en) * 1986-12-11 1988-06-17 Daimler Benz Ag Drive for IC engine fuel pump - has floating flow regulator connection linking chain-drive wheel to engine camshaft, with smoothing flywheel
EP0849438A1 (en) * 1996-12-19 1998-06-24 Toyota Jidosha Kabushiki Kaisha Valve train in internal combustion engine
EP0902181A2 (en) * 1997-09-11 1999-03-17 Denso Corporation Variable-discharge-rate high-pressure pump

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012116854A1 (en) * 2011-03-01 2012-09-07 Robert Bosch Gmbh Method for controlling an internal combustion engine
CN103415689A (en) * 2011-03-01 2013-11-27 罗伯特·博世有限公司 Method for controlling an internal combustion engine
CN103415689B (en) * 2011-03-01 2016-07-06 罗伯特·博世有限公司 For the method controlling internal combustion engine

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