EP0177715A2 - Process for detecting the closing point of a transverse bore by a piston in a pump cylinder - Google Patents
Process for detecting the closing point of a transverse bore by a piston in a pump cylinder Download PDFInfo
- Publication number
- EP0177715A2 EP0177715A2 EP85110244A EP85110244A EP0177715A2 EP 0177715 A2 EP0177715 A2 EP 0177715A2 EP 85110244 A EP85110244 A EP 85110244A EP 85110244 A EP85110244 A EP 85110244A EP 0177715 A2 EP0177715 A2 EP 0177715A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- closing point
- pump piston
- piston
- transverse bore
- 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.)
- Withdrawn
Links
Images
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
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/002—Measuring fuel delivery of multi-cylinder injection pumps
-
- 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
- F04B51/00—Testing machines, pumps, or pumping installations
-
- 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
- F04B2201/00—Pump parameters
- F04B2201/02—Piston parameters
- F04B2201/0201—Position of the piston
-
- 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
- F04B2201/00—Pump parameters
- F04B2201/08—Cylinder or housing parameters
- F04B2201/0804—Noise
-
- 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
- F04B2203/00—Motor parameters
- F04B2203/02—Motor parameters of rotating electric motors
- F04B2203/0209—Rotational speed
-
- 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
- F04B2203/00—Motor parameters
- F04B2203/02—Motor parameters of rotating electric motors
- F04B2203/0211—Noise
-
- 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
- F04B2205/00—Fluid parameters
- F04B2205/01—Pressure before the pump inlet
-
- 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
- F04B2205/00—Fluid parameters
- F04B2205/08—Pressure difference over a throttle
-
- 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
- F04B2205/00—Fluid parameters
- F04B2205/09—Flow through the pump
-
- 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
- F04B2205/00—Fluid parameters
- F04B2205/13—Pressure pulsations after the pump
Definitions
- the invention is based on a method according to the preamble of the main claim.
- the pressure increase when the cross bore is closed by the pump piston is used.
- a test liquid must be used to carry out this method, which requires a relatively large amount of equipment. Otherwise, this method can only be used for the stated purpose.
- the method according to the invention with the characterizing features of the main claim has the advantage that the determination of the closing point is carried out using a method corresponding to the actual stress and that the determination of the closing point is particularly accurate.
- both the geometric closing point and edge defects on the piston or the transverse bore and also the piston play can be quantitatively recorded and assessed in the same method.
- FIG. 1 shows a device for carrying out the method according to the invention in a simplified representation
- FIG. 2 shows a diagram.
- 10 denotes a pump cylinder, in the continuous longitudinal bore 11 of which a pump piston 12 is guided in a tightly sliding manner. This is given a reciprocating movement on its end face 12 'protruding from the pump cylinder 10 by a cam or eccentric, not shown.
- the upper part of the longitudinal bore 11 forms an outlet 13 '.
- a transverse bore 14 penetrates into the longitudinal bore 11 somewhat below the upper end of the pump cylinder.
- At the cross bore 14 is one of a Compressed air source 16 fed line 15, in which a pressure control valve 17 is arranged. From this line 18 leads to a manometer 20.
- a throttle 21 is arranged in line 15 between the pressure control valve 17 and the pump cylinder 10.
- a constant admission pressure p e is set in the line 15 such that a supercritical pressure ratio exists on the variable throttle cross section formed by the transverse bore 14 and an upper or lower control edge 22, 22 'of the pump piston 12; for air p e / p o > 1.9.
- the choke 21 only serves to limit the current when the transverse bore 14 is fully open.
- a line 25 is connected to the outlet 13 'and leads to a flow meter 26.
- the flow rate can also be measured indirectly with the aid of a measuring orifice 27 via the differential pressure, which is arranged in a line 25 'shown in broken lines.
- the pressure drop ⁇ at the orifice plate 27 can be read on a manometer 28.
- the position of the pump piston 12 can be measured on the end face 12 'by means of a travel scale 29 arranged there.
- the determination of the closing point of the pump piston ie the position of the pump piston at which it has just swept the cross-bore 14 completely (closing) with one of its control edges 22, 22 ', is carried out by successively moving the pump piston axially in the vicinity of the closing point two predetermined flow rates Q 2 and Q are approached and the latter assigned positions of the pump piston s2 and s 1 can be measured on the travel scale 29.
- a constant admission pressure p e is previously set in the line 15 such that a supercritical pressure ratio exists at the variable throttle cross section (control surface) formed by the transverse bore 14 and the end face 22 of the pump piston.
- p e / p o > 1.9 should be selected.
- the flow rates Q 1 and Q 2 are measured either on the flow device 26 or indirectly on the measuring orifice 27.
- Another possibility is to approach the closing point s o determined using the extrapolation method described and to determine the leakage current Q o present in this position.
- the quality of the control edge on the end face 22 of the pump piston and the size of the play between the latter and the pump cylinder can thus be assessed.
- the path of the pump piston 12 is plotted on the abscissa and the flow rates through the throttle cross section are plotted on the ordinate.
- Q 2 is measured at waypoint s 1, the value Q. 1
- the computer determines the closing point s from s 2 and s 1 .
- the leakage current measurement Q is carried out at point s.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Reciprocating Pumps (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
Das vorgeschlagene Verfahren dient zur Ermittlung des Schließpunktes eines Pumpenkolbens (12), insbesondere einer Einspritzpumpe, gegenüber einer Durchlaßbohrung im zugehörigen Zylinder (14). Nähert sich die Kante des Pumpenkolbens dem Schließpunkt, so entsteht ein zunehmend kleiner werdender Drosselquerschnitt. Bei der hierbei erfolgenden Axialbewegung des Kolbenelements werden am Anfang und Ende einer bestimmten Wegstrecke (s1, S2) die hierbei abströmende Druckmittelmenge (Q1, Q2) gemessen. Aufgrund einer bestimmten, zu ermittelnden Formel läßt sich auf den Schließpunkt extrapolieren. Als Druckmedium wird Druckluft verwendet. Das vorgeschlagene Verfahren ist sehr genau, und der erforderliche Geräteaufwand ist gering.The proposed method is used to determine the closing point of a pump piston (12), in particular an injection pump, in relation to a passage bore in the associated cylinder (14). If the edge of the pump piston approaches the closing point, the throttle cross-section becomes increasingly smaller. During the axial movement of the piston element, the amount of pressure medium (Q1, Q2) flowing out is measured at the beginning and end of a certain distance (s1, S2). Based on a specific formula to be determined, the closing point can be extrapolated. Compressed air is used as the pressure medium. The proposed method is very precise and the equipment required is low.
Description
Die Erfindung geht aus von einem Verfahren nach der Gattung des Hauptanspruchs. Bei einem derartigen bekannten Verfahren wird der Druckanstieg beim Schließen der Querbohrung durch den Pumpenkolben verwendet. Zur Durchführung dieses Verfahrens muß eine Prüfflüssigkeit verwendet werden, was einen relativ großen Geräteaufwand bedingt. Im übrigen ist dieses Verfahren nur für den genannten Zweck verwendbar.The invention is based on a method according to the preamble of the main claim. In such a known method, the pressure increase when the cross bore is closed by the pump piston is used. A test liquid must be used to carry out this method, which requires a relatively large amount of equipment. Otherwise, this method can only be used for the stated purpose.
Das erfindungsgemäße Verfahren mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß die Ermittlung des Schließpunktes mit einem der tatsächlichen Beanspruchung entsprechenden Verfahren vorgenommen wird und daß die Ermittlung des Schließpunktes besonders genau ist. Außerdem können im selben Verfahren sowohl der geometrische Schließpunkt als auch Kantenfehler am Kolben bzw. der Querbohrung und weiterhin das Kolbenspiel quantitativ erfaßt und beurteilt werden.The method according to the invention with the characterizing features of the main claim has the advantage that the determination of the closing point is carried out using a method corresponding to the actual stress and that the determination of the closing point is particularly accurate. In addition, both the geometric closing point and edge defects on the piston or the transverse bore and also the piston play can be quantitatively recorded and assessed in the same method.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Verfahrens möglich.Advantageous further developments and improvements of the method specified in the main claim are possible through the measures listed in the subclaims.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine Einrichtung zur Durchführung des erfindungsgemäßen Verfahrens in vereinfachter Darstellung, in Figur 2 ein Diagramm.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. FIG. 1 shows a device for carrying out the method according to the invention in a simplified representation, and FIG. 2 shows a diagram.
In Figur 1 ist mit 10 ein Pumpenzylinder bezeichnet, in dessen durchgehender Längsbohrung 11 ein Pumpenkolben 12 dicht gleitend geführt ist. Diesem wird an seiner aus dem Pumpenzylinder 10 ragenden Stirnfläche 12' durch einen nicht dargestellten Nocken oder Exzenter eine hin- und hergehende Bewegung erteilt. Der obere Teil der Längsbohrung 11 bildet einen Auslaß 13'. Etwas unterhalb des oberen Endes des Pumpenzylinder dringt eine Querbohrung 14 in die Längsbohrung 11 ein. An die Querbohrung 14 ist eine von einer Druckluftquelle 16 gespeiste Leitung 15 angeschlossen, in der ein Druckregelventil 17 angeordnet ist. Von diesem führt eine Leitung 18 zu einem Manometer 20. In der Leitung 15 ist zwischen dem Druckregelventil 17 und dem Pumpenzylinder 10 eine Drossel 21 angeordnet. Mit Hilfe des Druckregelers 17 wird in der Leitung 15 ein konstanter Vordruck p e so eingestellt, daß an dem durch die Querbohrung 14 und eine obere bzw. untere Steuerkante 22, 22' des Pumpenkolbens 12 gebildeten veränderbaren Drosselquerschnitt ein überkritisches Druckverhältnis besteht; dieses ist für Luft pe/po > 1,9. Die Drossel 21 dient lediglich zur Strombegrenzung bei vollkommen geöffneter Querbohrung 14.In FIG. 1, 10 denotes a pump cylinder, in the continuous
An den Auslaß 13' ist eine Leitung 25 angeschlossen, die zu einem Durchflußmeßgerät 26 führt. Alternativ hierzu kann die Durchflußmenge auch mit Hilfe einer Meßblende 27 indirekt über den Wirkdruck gemessen werden, die in einer strichpunktiert dargestellten Leitung 25' angeordnet ist. Der Druckabfall Δ an der Meßblende 27 kann an einem Manometer 28 abgelesen werden. Die Stellung des Pumpenkolbens 12 kann an der Stirnfläche 12' durch eine dort angeordnete Wegskala 29 gemessen werden.A line 25 is connected to the outlet 13 'and leads to a
Die Ermittlung des Schließpunktes des Pumpenkolbens, d.i. die Position des Pumpenkolbens, bei der er mit einer seiner Steuerkanten 22, 22' die Querbohrung 14 gerade vollständig (schließend) überstrichen hat,erfolgt dadurch, daß durch axiales Verschieben des Pumpenkolbens in der Nähe des Schließpunktes nacheinander zwei vorzugebende Durchflußwerte Q2 und Q angefahren werden und die diesen zugeordneten Stellungen des Pumpenkolbens s2 und s1 an der Wegskala 29 gemessen werden. Mit Hilfe des Druckreglers 17 wird zuvor ein konstanter Vordruck pe in der Leitung 15 so eingestellt, daß an dem durch die Querbohrung 14 und die Stirnfläche 22 des Pumpenkolbens gebildeten veränderbaren Drosselquerschnitt (Steuerfläche) ein überkritisches Druckverhältnis besteht. Für Luft ist pe/po > 1,9 zu wählen. Die Durchflußmengen Q1 und Q2 werden entweder am Durchflußgerät 26 oder indirekt an der Meßblende 27 gemessen.The determination of the closing point of the pump piston, ie the position of the pump piston at which it has just swept the
Aus dem für den Fall eines überkritischen Druckverhältnisses pe/po am obengenannten Drosselquerschnitt abgeleiteten Zusammenhang zwischen der Höhe (hi = si - s ) des als Kreissegmentfläche zu beschreibenden Drosselquerschnitts A. i und der Durchflußmenge
Diese Näherungsformel ist hinreichend genau, wenn die für Q2 und Q1 wirksamen Steuerflächen ≤ 1 % der ganzen offenen Querbohrungsfläche 14 sind. Durch geschickte Wahl der Vorgabewerte von Q2 und Q1, nämlich Q2/Q1 = √8 mit z.B. Q2 = 800 ml/min und Q1 = 283 ml/min vereinfacht sich die Berechnungsformel zu
Eine weitere Möglichkeit besteht darin, den nach der beschriebenen Extrapolationsmethode ermittelten Schließpunkt so anzufahren und den in dieser Stellung vorhandenen Leckstrom Qo zu ermitteln. Damit können die Qualität der Steuerkante an der Stirnfläche 22 des Pumpenkolbens sowie die Größe des Spiels zwischen diesem und dem Pumpenzylinder beurteilt werden.Another possibility is to approach the closing point s o determined using the extrapolation method described and to determine the leakage current Q o present in this position. The quality of the control edge on the
Im Diagramm nach Figur 2 sind auf der Abszisse der Weg des Pumpenkolbens 12 und auf der Ordinate die Durchflußmengen durch den Drosselquerschnitt aufgetragen. Am Wegpunkt s2 wird Q2 gemessen, am Wegpunkt s1 der Wert Q1. Der Rechner ermittelt aus s2 und s1 den Schließpunkt s . Im Punkt s erfolgt die Leckstrommessung Q .In the diagram according to FIG. 2, the path of the
Claims (8)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3434867 | 1984-09-22 | ||
DE19843434867 DE3434867A1 (en) | 1984-09-22 | 1984-09-22 | METHOD FOR DETERMINING THE CLOSING POINT OF A PUMP PISTON AGAINST A CROSS HOLE IN THE RELATED PUMP CYLINDER |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0177715A2 true EP0177715A2 (en) | 1986-04-16 |
EP0177715A3 EP0177715A3 (en) | 1989-01-04 |
Family
ID=6246098
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85110244A Withdrawn EP0177715A3 (en) | 1984-09-22 | 1985-08-16 | Process for detecting the closing point of a transverse bore by a piston in a pump cylinder |
Country Status (5)
Country | Link |
---|---|
US (1) | US4665742A (en) |
EP (1) | EP0177715A3 (en) |
JP (1) | JPS6179871A (en) |
BR (1) | BR8504602A (en) |
DE (1) | DE3434867A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5895844A (en) * | 1997-05-29 | 1999-04-20 | Outboard Marine Corporation | Precise fuel flow measurement with modified fluid control valve |
DE10107032A1 (en) * | 2001-02-15 | 2002-08-29 | Bosch Gmbh Robert | Method, computer program and device for measuring the injection quantity of injection nozzles, in particular for motor vehicles |
FI120602B (en) * | 2008-01-02 | 2009-12-15 | Waertsilae Finland Oy | Method and apparatus for testing the injection pump piston |
CN110530656B (en) * | 2018-05-25 | 2022-03-18 | 中车唐山机车车辆有限公司 | Wind regime system test bench |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE827142C (en) * | 1950-02-09 | 1952-01-07 | Bosch Gmbh Robert | Tester for fuel injection systems |
DE874531C (en) * | 1951-11-13 | 1953-04-23 | Bosch Gmbh Robert | Device for checking the start of delivery of injection pumps for internal combustion engines |
DE762582C (en) * | 1942-03-08 | 1954-02-15 | Bosch Gmbh Robert | Device for determining the feed start position of fuel injection pumps |
US2979945A (en) * | 1957-08-16 | 1961-04-18 | Flightex Fabrics Inc | Apparatus for measuring the dead space travel in servo valves |
DE3047078A1 (en) * | 1980-12-13 | 1982-07-15 | Robert Bosch Gmbh, 7000 Stuttgart | METHOD FOR DETERMINING THE START OF DELIVERY IN INJECTION PUMPS |
FR2523217A1 (en) * | 1982-03-09 | 1983-09-16 | France Etat | Engine injection pump port closing detector - uses constant pressure gas supply connected to discharge union by control gate |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3005414A1 (en) * | 1980-02-14 | 1981-08-20 | Daimler-Benz Ag, 7000 Stuttgart | Fuel injection pump for IC engine - is pivoted by servomotor to set optimum position w.r.t. engine |
-
1984
- 1984-09-22 DE DE19843434867 patent/DE3434867A1/en active Granted
-
1985
- 1985-08-07 US US06/763,358 patent/US4665742A/en not_active Expired - Fee Related
- 1985-08-16 EP EP85110244A patent/EP0177715A3/en not_active Withdrawn
- 1985-09-20 JP JP60206706A patent/JPS6179871A/en active Pending
- 1985-09-20 BR BR8504602A patent/BR8504602A/en unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE762582C (en) * | 1942-03-08 | 1954-02-15 | Bosch Gmbh Robert | Device for determining the feed start position of fuel injection pumps |
DE827142C (en) * | 1950-02-09 | 1952-01-07 | Bosch Gmbh Robert | Tester for fuel injection systems |
DE874531C (en) * | 1951-11-13 | 1953-04-23 | Bosch Gmbh Robert | Device for checking the start of delivery of injection pumps for internal combustion engines |
US2979945A (en) * | 1957-08-16 | 1961-04-18 | Flightex Fabrics Inc | Apparatus for measuring the dead space travel in servo valves |
DE3047078A1 (en) * | 1980-12-13 | 1982-07-15 | Robert Bosch Gmbh, 7000 Stuttgart | METHOD FOR DETERMINING THE START OF DELIVERY IN INJECTION PUMPS |
FR2523217A1 (en) * | 1982-03-09 | 1983-09-16 | France Etat | Engine injection pump port closing detector - uses constant pressure gas supply connected to discharge union by control gate |
Also Published As
Publication number | Publication date |
---|---|
JPS6179871A (en) | 1986-04-23 |
DE3434867A1 (en) | 1986-04-03 |
US4665742A (en) | 1987-05-19 |
BR8504602A (en) | 1986-07-15 |
EP0177715A3 (en) | 1989-01-04 |
DE3434867C2 (en) | 1991-12-05 |
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Inventor name: ABT, JUEGEN, DIPL.-ING. (FH) Inventor name: HANDTMANN, DIETER, DR. DIPL.-PHYS. Inventor name: BOLLHAGEN, HEINS Inventor name: STUMPF, SYBILLE Inventor name: KUHN, ULRICH, DR. DIPL.-PHYS. |