EP2172642A1 - Injector system for diesel fuels - Google Patents

Injector system for diesel fuels Download PDF

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Publication number
EP2172642A1
EP2172642A1 EP09011631A EP09011631A EP2172642A1 EP 2172642 A1 EP2172642 A1 EP 2172642A1 EP 09011631 A EP09011631 A EP 09011631A EP 09011631 A EP09011631 A EP 09011631A EP 2172642 A1 EP2172642 A1 EP 2172642A1
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EP
European Patent Office
Prior art keywords
rail
control
pressure
injection system
ecu
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP09011631A
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German (de)
French (fr)
Inventor
Erich Eder
Peter Prinz-Hufnagel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motorenfabrik Hatz GmbH and Co KG
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Motorenfabrik Hatz GmbH and Co KG
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Publication date
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Publication of EP2172642A1 publication Critical patent/EP2172642A1/en
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other 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
    • F02M63/02—Fuel-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
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/023—Means for varying pressure in common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/24—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke
    • F02M59/26—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders
    • F02M59/265—Varying fuel delivery in quantity or timing with constant-length-stroke pistons having variable effective portion of stroke caused by movements of pistons relative to their cylinders characterised by the arrangement or form of spill port of spill contour on the piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other 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
    • F02M63/02—Fuel-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
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/0265—Pumps feeding common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other 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
    • F02M63/02—Fuel-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
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/0265—Pumps feeding common rails
    • F02M63/027—More than one high pressure pump feeding a single common rail

Definitions

  • the invention relates to an injection system according to the preamble of patent claim 1.
  • a known injection system of the CR type is in EP 1387079 A1 described. It has a high-pressure pump which supplies a rail with fuel via a flow rate control, to which injectors for the individual cylinders are connected.
  • the high-pressure pump is supplied via a low-pressure feed pump, which draws fuel from a tank and delivers it to the high-pressure pump via a pressure relief valve.
  • the pressure in the rail is regulated by means of an electronic control unit.
  • a common rail (CR) and injectors are provided, via which the injection quantity corresponding to the operating pressure in Rail is controlled.
  • the CR is supplied via tappet-operated monoblock pumps, so that the operating pressure in the rail is the same under almost all operating conditions, for example 1400 bar. This is achieved by providing the plungers of the monobloc pumps with a bottom oblique control edge, which cooperates with a diversion bore, depending on the rotational position of the plunger. In this way, the amount of fuel in the rail is deactivated in accordance with the predetermined rail pressure.
  • the present invention has for its object to avoid the disadvantages of the known injection systems and to reduce their expenditure on equipment.
  • the solution according to the invention requires a low energy consumption as a result of the volume control in the monobloc pumps, in each case on their low-pressure side.
  • the control of the rail pressure only requires a pressure sensor and as a safety device, a pressure relief valve which is connected via a return line to the fuel tank. The time required for the pressure-side shutdown on the rail consuming pressure control valve is eliminated.
  • the monobloc pumps each have a rotatable plunger provided with an overhead control edge, the rotational position of which can be controlled by the ECU, in that the rotational position of the control edge suitable for the operating pressure in the rail can be set according to characteristic map specifications.
  • This embodiment of the monobloc pumps as controllable piston pumps realizes a direct volume control in the monobloc pumps with little effort and with low energy consumption. These promote only as much fuel as is necessary to maintain the respective rail pressure provided in the map.
  • the pump plunger is rotated via a control rod actuated by an actuator, which is translationally reciprocated.
  • the actuator is a solenoid, a linear magnet or a servo motor, the actuator receives its path information via the ECU, which operates on the engine map.
  • one or more monobloc pumps may be provided; Accordingly, one or more pump plungers can be actuated by means of a control rod whose adjustment path can be controlled via the ECU.
  • the determined according to the engine map quantity results accordingly the adjustment of the control rod or the phase position of the control edge, which runs between zero promotion and full promotion obliquely to the plunger axis.
  • the control edge is formed as an overhead control edge, with which the flow rate promotion begins only when a suction hole for the fuel flowing into the pump cylinder fuel is covered by the control edge.
  • the height of the control edge and thus the Pumpennutzhub is determined by the respective rotational position of the pump plunger.
  • the overhead control edge allows the energy-saving control of the amount of fuel on the low pressure side of the plunger, i. only after the quantitative metering the high pressure level is reached.
  • a pressure relief valve is provided, which is connected via a return line to the fuel tank.
  • a pressure sensor is connected to the rail, which communicates with the ECU and allows the control of the operating pressure in the rail according to the specifications of the map.
  • a CR system with high-pressure pumps based on monobloc pumps with discharge on the pressure side can be designed for rail pressure values of approx. 1400 bar. Is it possible from the emission limits forth with e.g. 800 bar of injection pressure, low-cost injectors can be used, which in conjunction with mini high-pressure pumps and pump-side Mengenzufug result in a very cost-effective CR system.
  • Fig. 1 two monobloc pumps 1 are provided for supplying the rail 2.
  • the roller tappet of the monobloc pumps 1 are actuated by means of a camshaft 3.
  • the monobloc pumps 1 convey into the rail 2 a quantity of fuel required according to the engine map, which quantity is metered by an electronic control unit 4 via a signal line 5.
  • the signal line 5 is used to control one Fig. 2 closer actuator described in the form of a solenoid 6, which actuates a control rod 7 translationally.
  • the control rod 7 operates the rotation of the plunger 8 of the monobloc pumps 1, so that the control edge 9 is suitably positioned according to the respective pressure buildup with respect to a suction port 10 in the pump cylinder 11.
  • a metered amount of fuel is compressed and fed to the rail 2 via high-pressure lines 12.
  • Each engine cylinder is associated with an injector 13, which is supplied via a high-pressure line 14 from the rail 2.
  • a connected to the rail pressure relief valve 15 is connected via a return line 16 to the fuel tank 17.
  • a pressure sensor 18 is provided, which is connected via a control line 19 to the ECU. Also, the pressure relief valve 15 is connected via a control line 27 to the ECU, so that it may be possible to respond to pressure fluctuations in the rail.
  • the injectors 13 are each connected via a control line 23 to the ECU 4, so that they are controlled according to the map specifications. The injectors 13 are also connected in each case via a leakage line 26 to the fuel tank 17.
  • the delivery of the fuel from the fuel tank 17 to the monobloc pumps 1 takes place by means of a feed pump 20 via a fuel feed line 21, in which a fuel filter 22 is installed.
  • a feed pump 20 is an electric diaphragm pump or a conventional piston pump.
  • the two piston pumps 1 are supplied with fuel at a pressure on the inlet side of up to 2 bar.
  • the compression of the metered amount of fuel is then via the plunger 8 according to the characteristic map controlled positioning of the control edges 9 of the plunger. 8
  • Both monoblock pumps 1 are connected via leakage lines 25 to the fuel tank 17.
  • Fig. 2 a middle rotational position of the control edge 9 of the plunger 8 is shown, whereby a partially throttled Mengenzuflop is realized. Since it is a so-called overhead control edge, the Nutzhub begins after passing over the suction port 10 by the control edge 9, while the plunger 8 is moved in the axial direction upwards.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The system has tappet-operated mono block pumps (1) with an overhead control edge of plungers provided on a low pressure side such that a characteristic diagram-based electronic control unit (ECU) (4) is assigned to injectors for injection amount measurement and to the plungers of the mono block pumps for controlling of operating pressure in a common rail (2). The injectors are connected with a fuel tank (17) via a leakage line (26). An injection amount is controlled according to operating parameters by the injectors.

Description

Die Erfindung betrifft ein Einspritzsystem nach dem Oberbegriff von Patentanspruch 1.The invention relates to an injection system according to the preamble of patent claim 1.

Ein bekanntes Einspritzsystem des CR-Typs ist in EP 1387079 A1 beschrieben. Es besitzt eine Hochdruckpumpe, welche über eine Durchflussmengensteuerung ein Rail mit Kraftstoff versorgt, an welches Injektoren für die einzelnen Zylinder angeschlossen sind. Die Hochdruckpumpe wird versorgt über eine Niederdruckförderpumpe, welche Kraftstoff aus einem Tank ansaugt und über ein Überdruckventil an die Hochdruckpumpe liefert. Der Druck im Rail wird mittels einer elektronischen Steuereinheit geregelt.A known injection system of the CR type is in EP 1387079 A1 described. It has a high-pressure pump which supplies a rail with fuel via a flow rate control, to which injectors for the individual cylinders are connected. The high-pressure pump is supplied via a low-pressure feed pump, which draws fuel from a tank and delivers it to the high-pressure pump via a pressure relief valve. The pressure in the rail is regulated by means of an electronic control unit.

Bei dieser bekannten Methode der sog. Saugdrosselung wird den Hochdruckpumpen nur jene Menge Kraftstoff zugemessen, welche zur Erzeugung des Betriebsdrucks im Rail erforderlich ist. Als Folge des gedrosselten Ansaugens von Kraftstoff verdampft dieser teilweise und führt bei dessen Verdichtung zu unerwünschten Schlaggeräuschen und Bauteilbelastungen.In this known method of suction throttling, only the amount of fuel which is required to produce the operating pressure in the rail is metered into the high-pressure pumps. As a result of the throttled suction of fuel this evaporates partially and leads to its compression to unwanted impact noise and component loads.

Bei einer anderen bekannten Kraftstoffeinspritzvorrichtung für Dieselmotoren ( DE 195084115 A1 ) sind ein Common Rail (CR) und Injektoren vorgesehen, über welche die Einspritzmenge entsprechend dem Betriebsdruck im Rail gesteuert wird. Dabei wird das CR über stößelbetätigte Monoblockpumpen versorgt, sodass der Betriebsdruck im Rail unter nahezu allen Betriebsbedingungen gleich ist, beispielsweise 1400 bar beträgt. Dies wird dadurch erreicht, dass die Plunger der Monoblockpumpen mit einer untenliegenden schrägen Steuerkante versehen sind, die je nach Drehstellung des Plungers mit einer Absteuerbohrung zusammenwirkt. Auf diese Weise wird die Kraftstoffmenge im Rail entsprechend dem vorgegebenen Raildruck abgesteuert.In another known fuel injection device for diesel engines ( DE 195084115 A1 ), a common rail (CR) and injectors are provided, via which the injection quantity corresponding to the operating pressure in Rail is controlled. The CR is supplied via tappet-operated monoblock pumps, so that the operating pressure in the rail is the same under almost all operating conditions, for example 1400 bar. This is achieved by providing the plungers of the monobloc pumps with a bottom oblique control edge, which cooperates with a diversion bore, depending on the rotational position of the plunger. In this way, the amount of fuel in the rail is deactivated in accordance with the predetermined rail pressure.

Demgegenüber liegt der vorliegenden Erfindung die Aufgabe zugrunde, die geschilderten Nachteile der bekannten Einspritzsysteme zu vermeiden und deren apparativen Aufwand zu reduzieren.In contrast, the present invention has for its object to avoid the disadvantages of the known injection systems and to reduce their expenditure on equipment.

Erfindungsgemäß wird diese Aufgabe gemäß dem Kennzeichen von Anspruch 1 gelöst.According to the invention this object is achieved according to the characterizing part of claim 1.

Die erfindungsgemäße Lösung erfordert einen geringen Energieaufwand infolge der Mengenregelung in den Monoblockumpen jeweils auf deren Niederdruckseite. Die Kontrolle des Raildrucks erfordert lediglich einen Drucksensor und als Sicherheitseinrichtung ein Überdruckventil, welches über eine Rückströmleitung mit dem Kraftstofftank verbunden ist. Das bei der druckseitigen Abregelung am Rail erforderliche aufwendige Druckregelventil entfällt.The solution according to the invention requires a low energy consumption as a result of the volume control in the monobloc pumps, in each case on their low-pressure side. The control of the rail pressure only requires a pressure sensor and as a safety device, a pressure relief valve which is connected via a return line to the fuel tank. The time required for the pressure-side shutdown on the rail consuming pressure control valve is eliminated.

Erfindungsgemäß weisen die Monoblockpumpen jeweils einen verdrehbaren, mit einer obenliegenden Steuerkante versehenen Plunger auf, dessen Drehlage über die ECU steuerbar ist, indem die für den Betriebsdruck im Rail geeignete Drehlage der Steuerkante nach Kennfeldvorgaben einstellbar ist.According to the invention, the monobloc pumps each have a rotatable plunger provided with an overhead control edge, the rotational position of which can be controlled by the ECU, in that the rotational position of the control edge suitable for the operating pressure in the rail can be set according to characteristic map specifications.

Durch diese Ausgestaltung der Monoblockpumpen als regelbare Kolbenpumpen ist mit geringem Aufwand und bei geringem Energieverbrauch eine direkte Mengenregelung in den Monoblockpumpen verwirklicht. Diese fördern nur soviel Kraftstoff, wie zur Aufrechterhaltung des jeweiligen im Kennfeld vorgesehenen Raildrucks notwendig ist.This embodiment of the monobloc pumps as controllable piston pumps realizes a direct volume control in the monobloc pumps with little effort and with low energy consumption. These promote only as much fuel as is necessary to maintain the respective rail pressure provided in the map.

Vorteilhaft wird der Pumpenplunger über eine von einem Stellglied betätigte Regelstange verdreht, welche translatorisch hin- und herbewegt wird. Als Stellglied eignet sich dabei ein Hubmagnet, ein Linearmagnet oder ein Stellmotor, wobei das Stellglied seine Weginformation über die ECU erhält, die nach dem Motorkennfeld arbeitet.Advantageously, the pump plunger is rotated via a control rod actuated by an actuator, which is translationally reciprocated. The actuator is a solenoid, a linear magnet or a servo motor, the actuator receives its path information via the ECU, which operates on the engine map.

Im Rahmen des erfindungsgemäßen Einspritzsystems können ein oder mehrere Monoblockpumpen vorgesehen sein; dementsprechend können ein oder mehrere Pumpenplunger über eine Regelstange betätigbar sein, deren Verstellweg über die ECU ansteuerbar ist. Die nach dem Motorkennfeld ermittelte Menge ergibt sich dabei entsprechend dem Verstellweg der Regelstange bzw. der Phasenlage der Steuerkante, welche zwischen Nullförderung und Vollförderung schräg zur Plungerachse verläuft.As part of the injection system according to the invention, one or more monobloc pumps may be provided; Accordingly, one or more pump plungers can be actuated by means of a control rod whose adjustment path can be controlled via the ECU. The determined according to the engine map quantity results accordingly the adjustment of the control rod or the phase position of the control edge, which runs between zero promotion and full promotion obliquely to the plunger axis.

Die Steuerkante ist als obenliegende Steuerkante ausgebildet, mit welcher die Mengenförderung erst beginnt, wenn ein Saugloch für den in den Pumpenzylinder einströmenden Kraftstoff von der Steuerkante überdeckt ist. Dabei wird die Höhe der Steuerkante und damit der Pumpennutzhub bestimmt durch die jeweilige Drehlage des Pumpenplungers.The control edge is formed as an overhead control edge, with which the flow rate promotion begins only when a suction hole for the fuel flowing into the pump cylinder fuel is covered by the control edge. The height of the control edge and thus the Pumpennutzhub is determined by the respective rotational position of the pump plunger.

Gegenüber der obenliegenden Steuerkante wäre der Einsatz einer untenliegenden Steuerkante nachteilig, weil bei dieser die Kraftstoffmenge erst nach Erreichen des maximalen Raildrucks abgesteuert wird. Hingegen ermöglicht die obenliegende Steuerkante die energiesparende Absteuerung der Kraftstoffmenge auf der Niederdruckseite des Plungers, d.h. erst nach der Mengenzumessung wird das Hochdruckniveau erreicht.Compared to the overhead control edge of the use of a lower control edge would be disadvantageous, because in this the fuel quantity is not deactivated until after reaching the maximum rail pressure. On the other hand, the overhead control edge allows the energy-saving control of the amount of fuel on the low pressure side of the plunger, i. only after the quantitative metering the high pressure level is reached.

Es wird nur soviel Einspritzmenge zuzüglich Übermenge für Leckagen verdichtet, wie für die Aufrechterhaltung des Raildrucks, der durch die ECU gesteuert wird, notwendig ist.It is compressed only as much injection quantity plus excess for leaks, as is necessary for the maintenance of the rail pressure, which is controlled by the ECU.

Es versteht sich von selbst, dass am Rail druckseitig ein Überdruckventil vorgesehen ist, welches über eine Rückströmleitung mit dem Kraftstofftank verbunden ist.It goes without saying that on the rail pressure side, a pressure relief valve is provided, which is connected via a return line to the fuel tank.

Eine derartige Maßnahme ist aus Sicherheitserwägungen unerlässlich.Such a measure is essential for safety reasons.

Ferner ist am Rail ein Drucksensor angeschlossen, der mit der ECU kommuniziert und die Steuerung des Betriebsdrucks im Rail entsprechend den Vorgaben des Kennfelds ermöglicht.Further, a pressure sensor is connected to the rail, which communicates with the ECU and allows the control of the operating pressure in the rail according to the specifications of the map.

Zum Ausgleich der für eine Schrägkantensteuerung typischen Seitenkräfte, die zu einseitiger Belastung und Schäden am Pumpenelement führen können, bietet sich die Anordnung zweier gleichartiger Steuerkanten gegenüberliegend bezüglich der Plungerlängsachse an, so dass sich die Seitenkräfte aufheben.To compensate for the lateral forces typical for a bevel control, which can lead to one-sided load and damage to the pump element, the arrangement of two similar control edges opposite offers with respect to the plunger longitudinal axis, so that cancel the side forces.

Ein CR-System mit Hochdruckpumpen auf Basis von Monoblockpumpen, mit druckseitiger Absteuerung, kann bis zu Raildruckwerten von ca. 1400 bar ausgelegt werden. Ist es von den Emissionsgrenzen her möglich mit z.B. 800 bar Einspritzdruck auszukommen, können Low-Cost-Injektoren eingesetzt werden, die in Verbindung mit Minihochdruckpumpen und pumpenseitiger Mengenzumessung ein sehr kostengünstiges CR-System ergeben.A CR system with high-pressure pumps based on monobloc pumps with discharge on the pressure side can be designed for rail pressure values of approx. 1400 bar. Is it possible from the emission limits forth with e.g. 800 bar of injection pressure, low-cost injectors can be used, which in conjunction with mini high-pressure pumps and pump-side Mengenzumessung result in a very cost-effective CR system.

Im Folgenden wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung erläutert. Es zeigt

Fig. 1
eine schematische Darstellung des Einspritz-systems und
Fig. 2
eine schematische Ansicht einer aufgeschnittenen Monoblockpumpe mit obenliegender Steuerkante ihres Plungers.
In the following an embodiment of the invention will be explained with reference to the drawing. It shows
Fig. 1
a schematic representation of the injection system and
Fig. 2
a schematic view of a cut-open monobloc pump with overhead control edge of their plunger.

Gemäß Fig. 1 sind zwei Monoblockpumpen 1 zur Versorgung des Rails 2 vorgesehen. Die Rollenstößel der Monoblockpumpen 1 werden mittels einer Nockenwelle 3 betätigt.According to Fig. 1 two monobloc pumps 1 are provided for supplying the rail 2. The roller tappet of the monobloc pumps 1 are actuated by means of a camshaft 3.

Die Monoblockpumpen 1 fördern in das Rail 2 eine nach dem Motorkennfeld geforderte Kraftstoffmenge, welche von einer elektronischen Steuereinheit 4 über eine Signalleitung 5 zugemessen wird. Die Signalleitung 5 dient der Ansteuerung eines zu Fig. 2 näher beschriebenen Stellglieds in Form eines Hubmagneten 6, welcher eine Regelstange 7 translatorisch betätigt. Wie in Fig. 2 gezeigt, betreibt die Regelstange 7 die Drehung der Plunger 8 der Monoblockpumpen 1, so dass deren Steuerkante 9 entsprechend dem jeweiligen Druckaufbau bezüglich einer Saugöffnung 10 im Pumpenzylinder 11 geeignet positionierbar ist. Entsprechend der Drehlage des Plungers 8 wird eine zugemessene Menge Kraftstoff verdichtet und dem Rail 2 über Hochdruckleitungen 12 zugeführt.The monobloc pumps 1 convey into the rail 2 a quantity of fuel required according to the engine map, which quantity is metered by an electronic control unit 4 via a signal line 5. The signal line 5 is used to control one Fig. 2 closer actuator described in the form of a solenoid 6, which actuates a control rod 7 translationally. As in Fig. 2 shown, the control rod 7 operates the rotation of the plunger 8 of the monobloc pumps 1, so that the control edge 9 is suitably positioned according to the respective pressure buildup with respect to a suction port 10 in the pump cylinder 11. According to the rotational position of the plunger 8, a metered amount of fuel is compressed and fed to the rail 2 via high-pressure lines 12.

Jedem Motorzylinder ist ein Injektor 13 zugeordnet, der über eine Hochdruckleitung 14 aus dem Rail 2 versorgt wird.Each engine cylinder is associated with an injector 13, which is supplied via a high-pressure line 14 from the rail 2.

Ein am Rail angeschlossenes Überdruckventil 15 ist über eine Rückströmleitung 16 mit dem Kraftstofftank 17 verbunden.A connected to the rail pressure relief valve 15 is connected via a return line 16 to the fuel tank 17.

Am gegenüberliegenden Ende des Rails 2 ist ein Drucksensor 18 vorgesehen, der über eine Steuerleitung 19 mit der ECU verbunden ist. Auch das Überdruckventil 15 ist über eine Steuerleitung 27 mit der ECU verbunden, so dass ggf. auf Druckschwankungen im Rail reagiert werden kann. Die Injektoren 13 sind jeweils über eine Steuerleitung 23 mit der ECU 4 verbunden, so dass sie entsprechend den Kennfeldvorgaben ansteuerbar sind. Die Injektoren 13 sind ferner jeweils über eine Leckageleitung 26 mit dem Kraftstofftank 17 verbunden.At the opposite end of the rail 2, a pressure sensor 18 is provided, which is connected via a control line 19 to the ECU. Also, the pressure relief valve 15 is connected via a control line 27 to the ECU, so that it may be possible to respond to pressure fluctuations in the rail. The injectors 13 are each connected via a control line 23 to the ECU 4, so that they are controlled according to the map specifications. The injectors 13 are also connected in each case via a leakage line 26 to the fuel tank 17.

Die Zuförderung des Kraftstoffs aus dem Kraftstofftank 17 zu den Monoblockpumpen 1 erfolgt mittels einer Förderpumpe 20 über eine Kraftstoffzulaufleitung 21, in welche ein Kraftstofffilter 22 eingebaut ist. Als Förderpumpe 20 eignet sich eine elektrische Membranpumpe oder eine übliche Kolbenpumpe. Über die Kraftstoffzulaufleitung 21 werden die beiden Kolbenpumpen 1 mit Kraftstoff bei einem Druck auf der Zulaufseite von bis zu 2 bar versorgt. Die Verdichtung der zugemessenen Kraftstoffmenge erfolgt dann über deren Plunger 8 nach Maßgebe der kennfeldgesteuerten Positionierung der Steuerkanten 9 der Plunger 8.The delivery of the fuel from the fuel tank 17 to the monobloc pumps 1 takes place by means of a feed pump 20 via a fuel feed line 21, in which a fuel filter 22 is installed. As a feed pump 20 is an electric diaphragm pump or a conventional piston pump. About the fuel supply line 21, the two piston pumps 1 are supplied with fuel at a pressure on the inlet side of up to 2 bar. The compression of the metered amount of fuel is then via the plunger 8 according to the characteristic map controlled positioning of the control edges 9 of the plunger. 8

Beide Monoblockpumpen 1 sind über Leckageleitungen 25 mit dem Kraftstofftank 17 verbunden.Both monoblock pumps 1 are connected via leakage lines 25 to the fuel tank 17.

In Fig. 2 ist eine mittlere Drehlage der Steuerkante 9 des Plungers 8 gezeigt, wobei damit eine teilgedrosselte Mengenzumessung verwirklicht ist. Da es sich um eine sog. obenliegende Steuerkante handelt, beginnt der Nutzhub nach dem Überfahren der Saugöffnung 10 durch die Steuerkante 9, während der Plunger 8 in axialer Richtung nach oben bewegt wird.In Fig. 2 a middle rotational position of the control edge 9 of the plunger 8 is shown, whereby a partially throttled Mengenzumessung is realized. Since it is a so-called overhead control edge, the Nutzhub begins after passing over the suction port 10 by the control edge 9, while the plunger 8 is moved in the axial direction upwards.

Claims (6)

Einspritzsystem für Dieselkraftstoff über ein Common Rail (2) und Injektoren (13), über welche die Einspritzmenge nach Betriebsparametern gesteuert wird, und dass zur Rail-Einspeisung stößelbetätigte Monoblockpumpen (1) vorgesehen sind,
dadurch gekennzeichnet,
dass auf ihrer Niederdruckseite mengengeregelte Monoblockpumpen (1) mit obenliegender Steuerkante (9) ihrer Plunger (8) vorgesehen sind,
dass den Injektoren (13) für die Einspritzmengenzumessung und den Plungern (8) der Monoblockpumpen (1) für die Steuerung des Betriebsdrucks im Rail (2) jeweils eine kennfeldbasierte Elektronische Steuereinheit (ECU) (4) zugeordnet ist und
dass die Injektoren (13) jeweils über eine Leckageleitung (26) mit dem Krafftstofftank (17) verbunden sind.Injection system for diesel fuel via a common rail (2) and injectors (13), via which the injection quantity is controlled according to operating parameters, and that plunger-actuated monoblock pumps (1) are provided for rail supply,
characterized,
that volume-controlled monobloc pumps (1) with overhead control edge (9) of their plungers (8) are provided on their low-pressure side,
in that the injectors (13) for the injection quantity measurement and the plungers (8) of the monoblock pumps (1) for the control of the operating pressure in the rail (2) are each assigned a map-based electronic control unit (ECU) (4) and
that the injectors (13) are each connected via a leakage line (26) to the Krafftstofftank (17). Einspritzsystem nach Anspruch 1,
dadurch gekennzeichnet,
dass die Plunger (8) der Monoblockpumpen (1) jeweils über eine Regelstange (7) verdrehbar sind, deren Verstellweg über die ECU (4) ansteuerbar ist.Injection system according to claim 1,
characterized,
in that the plungers (8) of the monoblock pumps (1) can each be rotated via a control rod (7) whose adjustment path can be controlled via the ECU (4). Einspritzsystem nach Anspruch 2,
dadurch gekennzeichnet,
dass für die Betätigung der Regelstange (7) ein über die ECU (4) elektrisch angetriebenes Stellglied in Form eines Linearmagneten oder eines Stellmotors vorgesehen ist.Injection system according to claim 2,
characterized,
in that an actuator in the form of a linear magnet or a servomotor, which is electrically driven via the ECU (4), is provided for actuating the control rod (7). Einspritzsystem nach Anspruch 1,
dadurch gekennzeichnet,
dass die Steuerkante (9) als obenliegende Steuerkante ausgebildet ist, mit welcher die Mengenförderung erst beginnt, wenn ein Saugloch (10) für den in den Pumpenzylinder (11) einströmenden Kraftstoff von der Steuerkante (9) überdeckt ist.Injection system according to claim 1,
characterized,
in that the control edge (9) is designed as an overhead control edge with which the quantity delivery only begins when a suction hole (10) for the fuel flowing into the pump cylinder (11) is covered by the control edge (9). Einspritzsystem nach Anspruch 1,
dadurch gekennzeichnet,
dass am Rail (2) druckseitig ein Überdruckventil (15) vorgesehen ist, welches über eine Rückströmleitung (16) mit dem Kraftstofftank (17) verbunden ist.Injection system according to claim 1,
characterized,
that on the rail (2) on the pressure side, a pressure relief valve (15) is provided, which is connected via a return flow line (16) to the fuel tank (17). Einspritzsystem nach Anspruch 1,
dadurch gekennzeichnet,
dass ein am Rail (2) angeschlossener Drucksensor (18) mit der ECU (4) über eine Steuerleitung (19) kommuniziert.Injection system according to claim 1,
characterized,
that on the rail (2) attached pressure sensor (18) to the ECU (4) via a control line (19) communicates.
EP09011631A 2008-10-02 2009-09-11 Injector system for diesel fuels Ceased EP2172642A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810050380 DE102008050380A1 (en) 2008-10-02 2008-10-02 Injection system for diesel fuels

Publications (1)

Publication Number Publication Date
EP2172642A1 true EP2172642A1 (en) 2010-04-07

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CN113530735A (en) * 2021-08-05 2021-10-22 思达耐精密机电（常熟）有限公司 Common rail pressure control valve characteristic test system and method

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EP0121689A1 (en) * 1983-03-05 1984-10-17 Robert Bosch Gmbh Fuel injection device for internal-combustion engines
DE4441113C1 (en) * 1994-11-18 1996-04-04 Bosch Gmbh Robert High pressure fuel pump for internal combustion engines
DE19508445A1 (en) 1995-03-09 1996-09-12 Kloeckner Humboldt Deutz Ag Fuel injection device for a self-igniting internal combustion engine
EP1387079A1 (en) 2002-07-30 2004-02-04 Magneti Marelli Powertrain S.p.A. Fuel injection system of the common rail type with a variable flow-rate pump
EP1865193A1 (en) * 2006-06-09 2007-12-12 CRF Societa'Consortile per Azioni Fuel injection system for an internal combustion engine

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EP0121689A1 (en) * 1983-03-05 1984-10-17 Robert Bosch Gmbh Fuel injection device for internal-combustion engines
DE4441113C1 (en) * 1994-11-18 1996-04-04 Bosch Gmbh Robert High pressure fuel pump for internal combustion engines
DE19508445A1 (en) 1995-03-09 1996-09-12 Kloeckner Humboldt Deutz Ag Fuel injection device for a self-igniting internal combustion engine
EP1387079A1 (en) 2002-07-30 2004-02-04 Magneti Marelli Powertrain S.p.A. Fuel injection system of the common rail type with a variable flow-rate pump
EP1865193A1 (en) * 2006-06-09 2007-12-12 CRF Societa'Consortile per Azioni Fuel injection system for an internal combustion engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113530735A (en) * 2021-08-05 2021-10-22 思达耐精密机电（常熟）有限公司 Common rail pressure control valve characteristic test system and method

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