DE102011081858A1 - Arrangement for controlling delivery rate of e.g. common-rail high pressure pump for delivering fuel, has valve spring supported at position element of actuator, so that travel of spring is increased/decreased by stroke movement of element - Google Patents
Arrangement for controlling delivery rate of e.g. common-rail high pressure pump for delivering fuel, has valve spring supported at position element of actuator, so that travel of spring is increased/decreased by stroke movement of element Download PDFInfo
- Publication number
- DE102011081858A1 DE102011081858A1 DE102011081858A DE102011081858A DE102011081858A1 DE 102011081858 A1 DE102011081858 A1 DE 102011081858A1 DE 102011081858 A DE102011081858 A DE 102011081858A DE 102011081858 A DE102011081858 A DE 102011081858A DE 102011081858 A1 DE102011081858 A1 DE 102011081858A1
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- Germany
- Prior art keywords
- valve
- spring
- actuator
- arrangement
- pressure pump
- Prior art date
- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
- F04B49/225—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves with throttling valves or valves varying the pump inlet opening or the outlet opening
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/46—Valves
- F02M59/464—Inlet valves of the check valve type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
- F02M63/0012—Valves
- F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
- F02M63/0075—Stop members in valves, e.g. plates or disks limiting the movement of armature, valve or spring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
- F04B49/24—Bypassing
- F04B49/243—Bypassing by keeping open the inlet valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
- F04B53/102—Disc valves
- F04B53/1022—Disc valves having means for guiding the closure member axially
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuel-Injection Apparatus (AREA)
- Rotary Pumps (AREA)
Abstract
Description
Die Erfindung betrifft eine Anordnung zur Steuerung der Fördermenge einer hydraulischen Pumpe, insbesondere einer Hochdruckpumpe zur Förderung von Kraftstoff, wie beispielsweise einer Common-Rail-Pumpe, mit den Merkmalen des Oberbegriffes des Anspruchs 1. Ferner betrifft die Erfindung eine Hochdruckpumpe mit einer solchen Anordnung.The invention relates to an arrangement for controlling the flow rate of a hydraulic pump, in particular a high pressure pump for conveying fuel, such as a common rail pump, with the features of the preamble of claim 1. Furthermore, the invention relates to a high-pressure pump with such an arrangement.
Stand der TechnikState of the art
In heutigen Kraftstoffeinspritzsystemen bzw. in den hierin eingesetzten Hochdruckpumpen werden Zumesseinheiten zur Steuerung der Fördermenge verwendet. Zumesseinheiten sind elektromagnetisch gesteuerte Drosselventile, die zur Fördermengenbegrenzung im Zulaufbereich einer Hochdruckpumpe stromauf eines Saugventils angeordnet werden. Das Saugventil ist regelmäßig als Rückschlagventil ausgebildet, welches im Förderbetrieb geschlossen ist, um aus der Hubbewegung eines Pumpenkolbens einen Fördereffekt zu erzielen.In today's fuel injection systems or in the high pressure pumps used herein, metering units are used to control the delivery rate. Metering units are solenoid-controlled throttle valves, which are arranged upstream of a suction valve to limit the flow rate in the inlet region of a high-pressure pump. The suction valve is regularly designed as a check valve, which is closed in the delivery mode to achieve a conveying effect from the lifting movement of a pump piston.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, die Fördermengensteuerung einer hydraulischen Pumpe einfacher und damit kostengünstiger zu gestalten.The present invention has for its object to make the delivery rate control of a hydraulic pump easier and thus cheaper.
Zur Lösung der Aufgabe wird eine Anordnung zur Fördermengensteuerung mit den Merkmalen des Anspruchs 1 vorgeschlagen. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben. Darüber hinaus wird eine Hochdruckpumpe mit einer solchen Anordnung vorgeschlagen.To solve the problem, an arrangement for flow control with the features of claim 1 is proposed. Advantageous developments of the invention are specified in the subclaims. In addition, a high pressure pump is proposed with such an arrangement.
Offenbarung der ErfindungDisclosure of the invention
Die vorgeschlagene Anordnung zur Steuerung der Fördermenge einer hydraulischen Pumpe, insbesondere einer Hochdruckpumpe zur Förderung von Kraftstoff, umfasst ein als Rückschlagventil ausgebildetes Saugventil mit einem axial beweglichen Ventilglied, das in Richtung eines in einer Ventilplatte ausgebildeten Ventilsitzes über die Federkraft einer Ventilfeder axial vorgespannt ist. Erfindungsgemäß ist die Ventilfeder einerseits an dem Ventilglied und andererseits an einem hubbeweglichen Stellelement eines Stellers abgestützt, so dass über eine Hubbewegung des Stellelementes der Federweg der Ventilfeder vergrößer- oder verkleinerbar ist. Eine Veränderung des Federweges bewirkt eine Veränderung der Kraft, mittels welcher das Ventilglied gegenüber dem Ventilsitz axial vorgespannt ist. Die Vorspannkraft wiederum bestimmt den Öffnungsdruck des Saugventils, das heißt den zum Öffnen des Ventils erforderlichen hydraulischen Druck. Über den Öffnungsdruck werden wiederum das Drosselverhalten des Saugventils und damit die Fördermenge gesteuert. Eine dem Saugventil vorgeschaltete Zumesseinheit kann somit entfallen. Anstelle der Zumesseinheit wird ein Steller mit einem hubbeweglichen Stellelement in den Zulaufbereich der Pumpe integriert, welcher – wie die nachfolgenden Ausführungsbeispiele zeigen – einfach aufgebaut und damit kostengünstig herstellbar sein kann.The proposed arrangement for controlling the flow rate of a hydraulic pump, in particular a high-pressure pump for conveying fuel, comprises a designed as a check valve suction valve with an axially movable valve member which is axially biased in the direction of a valve seat formed in a valve seat via the spring force of a valve spring. According to the invention, the valve spring is supported, on the one hand, on the valve member and, on the other hand, on a lifting element of an actuator, so that the travel of the valve spring can be increased or reduced by means of a stroke movement of the actuator. A change in the spring travel causes a change in the force by means of which the valve member is axially biased relative to the valve seat. The biasing force in turn determines the opening pressure of the suction valve, that is, the hydraulic pressure required to open the valve. About the opening pressure turn the throttle behavior of the suction valve and thus the flow rate are controlled. A metering unit upstream of the suction valve can thus be dispensed with. Instead of the metering unit, a controller is integrated with a liftable actuator in the inlet region of the pump, which - as the following embodiments show - simple and thus can be produced inexpensively.
Die erfindungsgemäße Anordnung umfasst somit ein als Rückschlagventil ausgebildetes Saugventil und einen ein hubbewegliches Stellelement aufweisenden Steller, wobei über die Hubbewegung des Stellelementes der Öffnungsdruck des Saugventils variabel einstellbar ist. Gegenüber einem direkt gesteuerten Saugventil, das oftmals aufgrund sehr viel größerer Massen das Problem besitzt, bei hohen Drehzahlen nicht ausreichend schnell schalten zu können, weist die erfindungsgemäße Anordnung den Vorteil auf, dass das eigentliche Saugventil relativ klein ausgeführt werden kann. Dies hat geringere Massen zur Folge, so dass bei hohen Drehzahlen eine ausreichend hohe Schaltfrequenz sicherstellt ist. Die eigentliche Vorrichtung schwingt zudem nicht mit.The arrangement according to the invention thus comprises a suction valve designed as a check valve and a actuator which has a liftable adjusting element, the opening pressure of the suction valve being variably adjustable via the lifting movement of the adjusting element. Compared with a directly controlled suction valve, which often has the problem due to much larger masses, can not switch sufficiently fast at high speeds, the arrangement according to the invention has the advantage that the actual suction valve can be made relatively small. This results in lower masses, so that at high speeds, a sufficiently high switching frequency is ensured. The actual device also does not resonate.
Die Einstellbarkeit des Öffnungsdrucks ermöglicht beispielsweise eine Anhebung des Öffnungsdrucks, um die Sensitivität des Saugventils zu reduzieren, so dass sich auch Kleinstmengen von etwa weniger als 2 l/h problemfrei darstellen lassen. Dies trägt zu einer verlustarmen Leerlaufregelung bei Verzicht auf ein Druckregelventil am Rail bei. The adjustability of the opening pressure, for example, allows an increase in the opening pressure to reduce the sensitivity of the suction valve, so that even small quantities of about less than 2 l / h can be displayed without problems. This contributes to a low-loss idle control when dispensing with a pressure control valve on the rail.
Im Unterschied zu einer Anordnung, welche zur Steuerung der Fördermenge eine Maximalhubbegrenzung des Ventilgliedes des Saugventils, beispielsweise über einen variablen Anschlag, einsetzt, erfordert die vorliegende Anordnung keine Hubbegrenzung und demzufolge kein Anschlagen des Ventilgliedes, so dass die üblicherweise mit dem Anschlagen einhergehenden Festigkeits- und/oder Geräuschprobleme vermieden werden.In contrast to an arrangement which uses a maximum stroke limitation of the valve member of the suction valve, for example via a variable stop, to control the flow rate, the present arrangement requires no stroke limitation and therefore no striking of the valve member, so that the usually associated with the striking strength and / or noise problems are avoided.
Ferner besitzt die vorgeschlagene Anordnung eine Nullförderfähigkeit, d.h., dass im Unterschied zu einer meist als Kolben-Schieber-Ventil ausgebildeten und damit leckagebehafteten Zumesseinheit die Fördermenge tatsächlich auf null eingestellt werden kann. Es bedarf demnach keiner zusätzlichen Maßnahmen, um eine Leckagemenge abzuführen, wie beispielsweise durch die Anordnung einer Nullförderdrossel. Dadurch kann das System weiter vereinfacht werden.Further, the proposed arrangement has a zero feed capability, that is, unlike a metering unit, which is usually designed as a piston-slide valve and thus subject to leaks, the delivery rate can actually be set to zero. It therefore requires no additional measures to dissipate a leakage amount, such as by the arrangement of a zero feed throttle. This can further simplify the system.
Vorzugsweise ist der Steller elektromotorisch, elektromagnetisch, elektromechanisch und/oder hydraulisch betätigbar. Da, beispielsweise im Vergleich mit einem elektromagnetisch gesteuerten Saugventil, vorliegend die hydraulischen Kräfte gering sind, kann ein sehr einfacher und zudem kostengünstiger Steller zum Einsatz gelangen.Preferably, the actuator is electromotive, electromagnetically, electromechanically and / or hydraulically actuated. Since, for example, in comparison with an electromagnetically controlled suction valve, in the present case, the hydraulic forces are low, can reach a very simple and also cost-effective controller used.
Gemäß einer bevorzugten Ausführungsform der Erfindung umfasst der Steller einen Stellmotor und/oder ein Schneckengetriebe. Die Kombination Stellmotor mit Schneckengetriebe ermöglicht die Realisierung eines sehr einfachen und kostengünstigen Stellers. Das Schneckengetriebe ist vorzugsweise selbsthemmend ausgeführt. Das heißt, dass die Gewindesteigung des Schneckengetriebes vorzugsweise derart gewählt ist, dass neben den Stellkräften keine Haltekräfte benötigt werden. Energie wird demnach lediglich zur Verstellung des Stellelementes, d.h. in der aktiven Stellphase, benötigt, so dass der Energieaufwand auf ein Minimum reduziert werden kann.According to a preferred embodiment of the invention, the actuator comprises a servo motor and / or a worm gear. The combination servo motor with worm gear allows the realization of a very simple and inexpensive actuator. The worm gear is preferably designed self-locking. This means that the thread pitch of the worm gear is preferably selected such that in addition to the restoring forces no holding forces are needed. Energy is therefore only for the adjustment of the actuator, i. in the active positioning phase, so that the energy expenditure can be reduced to a minimum.
Die zur Lösung der Aufgabe ferner vorgeschlagene Hochdruckpumpe zur Förderung von Kraftstoff zeichnet sich dadurch aus, dass sie eine erfindungsgemäße Anordnung zur Steuerung der Fördermenge umfasst. Eine dem Saugventil vorgeschaltete separate Zumesseinheit ist somit entbehrlich. Eine solche Hochdruckpumpe ist einfach und kostengünstig herstellbar.The solution to the problem also proposed high-pressure pump for the promotion of fuel is characterized in that it comprises an inventive arrangement for controlling the flow rate. A separate metering unit upstream of the suction valve is thus unnecessary. Such a high-pressure pump is simple and inexpensive to produce.
Bevorzugte Ausführungsformen der Erfindung werden nachfolgend anhand der beiliegenden Zeichnungen näher erläutert. Diese zeigen:Preferred embodiments of the invention are explained below with reference to the accompanying drawings. These show:
Ausführliche Beschreibung der ZeichnungenDetailed description of the drawings
Das in der
Über eine Hubbewegung des Stellelementes
Die Hubbewegung des Stellelementes
Der schematisch in der
Die Abhängigkeit des Öffnungsdrucks des Saugventils
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011081858A DE102011081858A1 (en) | 2011-08-31 | 2011-08-31 | Arrangement for controlling delivery rate of e.g. common-rail high pressure pump for delivering fuel, has valve spring supported at position element of actuator, so that travel of spring is increased/decreased by stroke movement of element |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011081858A DE102011081858A1 (en) | 2011-08-31 | 2011-08-31 | Arrangement for controlling delivery rate of e.g. common-rail high pressure pump for delivering fuel, has valve spring supported at position element of actuator, so that travel of spring is increased/decreased by stroke movement of element |
Publications (1)
Publication Number | Publication Date |
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DE102011081858A1 true DE102011081858A1 (en) | 2013-02-28 |
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DE102011081858A Withdrawn DE102011081858A1 (en) | 2011-08-31 | 2011-08-31 | Arrangement for controlling delivery rate of e.g. common-rail high pressure pump for delivering fuel, has valve spring supported at position element of actuator, so that travel of spring is increased/decreased by stroke movement of element |
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DE (1) | DE102011081858A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013211196A1 (en) | 2013-06-14 | 2014-12-18 | Robert Bosch Gmbh | Valve arrangement for controlling the flow rate of a high pressure pump and high pressure pump |
WO2016015912A1 (en) * | 2014-07-29 | 2016-02-04 | Robert Bosch Gmbh | High-pressure pump |
-
2011
- 2011-08-31 DE DE102011081858A patent/DE102011081858A1/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013211196A1 (en) | 2013-06-14 | 2014-12-18 | Robert Bosch Gmbh | Valve arrangement for controlling the flow rate of a high pressure pump and high pressure pump |
WO2016015912A1 (en) * | 2014-07-29 | 2016-02-04 | Robert Bosch Gmbh | High-pressure pump |
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R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |