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 PDF

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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
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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Withdrawn
Application number
EP85110244A
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German (de)
French (fr)
Other versions
EP0177715A3 (en
Inventor
Jügen Dipl.-Ing. Abt (FH)
Heins Bollhagen
Dieter Dr. Dipl.-Phys. Handtmann
Ulrich Dr. Dipl.-Phys. Kuhn
Sybille Stumpf
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP0177715A2 publication Critical patent/EP0177715A2/en
Publication of EP0177715A3 publication Critical patent/EP0177715A3/en
Withdrawn legal-status Critical Current

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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
    • 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.

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  • 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

Stand der TechnikState of the art

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.

Vorteile der ErfindungAdvantages of the invention

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.

Zeichnungdrawing

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.

Beschreibung des AusführungsbeispielsDescription of the embodiment

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 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. With the help of the pressure regulator 17, 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.

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 flow meter 26. As an alternative to this, 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 Δ 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.

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 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. With the help of the pressure regulator 17, 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. For air, 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.

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

Figure imgb0001
kann mit den ermittelten Wertpaaren Q2, s2 und Q1, s1 der Schließpunkt so berechnet werden:
Figure imgb0002
 From the relationship, derived for the case of a supercritical pressure ratio p e / p o at the above-mentioned throttle cross-section, between the height (h i = s i - s) of the throttle cross-section A. i to be described as a segment of a circle and the flow rate
Figure imgb0001
 the closing point s o can be calculated with the determined value pairs Q 2 , s 2 and Q 1 , s 1 :
Figure imgb0002

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

Figure imgb0003
This approximation formula is sufficiently precise if the control surfaces effective for Q 2 and Q 1 are ≤ 1% of the total open cross-bore surface 14. By skillfully choosing the default values of Q 2 and Q 1 , namely Q 2 / Q 1 = √8 with e.g. Q 2 = 800 ml / min and Q 1 = 283 ml / min simplifies the calculation formula
Figure imgb0003

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 end face 22 of the pump piston and the size of the play between the latter and the pump cylinder can thus be assessed.

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 pump piston 12 is plotted on the abscissa and the flow rates through the throttle cross section are plotted on the ordinate. At waypoint s 2 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.

Claims (8)

1. Verfahren zur Bestimmung des Schließpunktes eines Pumpenkolbens (12) gegenüber einer Querbohrung (14) im zugehörigen Pumpenzylinder, insbesondere bei Einspritzpumpen, durch Messen des Durchflußes durch einen durch den Pumpenkolben und die Querbohrung gebildeten Drosselquerschnitt, dadurch gekennzeichnet, daß durch axiales Verschieben des Pumpenkolbens in der Nähe des Schließpunkts aus zwei nacheinander gemessenen Durchflußwerten (Q1' Q2) und den hierzu gehörenden Positionen (s1, s2) des Pumpenkolbens auf den Schließpunkt (so) extrapoliert wird und daß für dieses Verfahren Druckluft verwendet wird.1. A method for determining the closing point of a pump piston (12) with respect to a transverse bore (14) in the associated pump cylinder, in particular in the case of injection pumps, by measuring the flow through a throttle cross section formed by the pump piston and the transverse bore, characterized in that by axially displacing the pump piston in the vicinity of the closing point from two successively measured flow values (Q 1 ' Q 2 ) and the associated positions (s 1 , s 2 ) of the pump piston is extrapolated to the closing point (s o ) and that compressed air is used for this process. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß zur Messung der Wertepaare (Q und s) am Drosselquerschnitt ein überkritisches Druckverhältnis besteht.2. The method according to claim 1, characterized in that there is a supercritical pressure ratio for measuring the value pairs (Q and s) at the throttle cross section. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Durchflußwerte (Q und Q ) fest vorgegeben werden und die zur Einstellung dieser Durchflüsse über die veränderlichen Drosselquerschnitte erforderlichen Kolbenpositionen (s2, s1) gemessen werden.3. The method according to claim 1 or 2, characterized in that the flow values (Q and Q) are predetermined and the piston positions (s 2 , s 1 ) required to set these flows through the variable throttle cross sections. 4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß Q1 zu Q1 in einem bestimmten Verhältnis besteht, insbesondere Q2/Q1 = √8.4. The method according to claim 3, characterized in that Q 1 to Q 1 in a certain ratio, in particular Q 2 / Q 1 = √8. 5. Verfahren nach Anspruch 3 und 4, dadurch gekennzeichnet, daß Q2 ungefähr 1 % des maximalen Wertes bei vollständig geöffneter Querbohrung (14) ist.5. The method according to claim 3 and 4, characterized in that Q 2 is approximately 1% of the maximum value when the transverse bore (14) is fully open. 6. Verfahren nach Anspruch 3 und 4, dadurch gekennzeichnet, daß Q1 und Q2 so festgelegt werden, daß der Betrag der Differenz der damit ermittelten Kolbenpositionen (s2 - s1) etwa 2 % des Durchmessers der Querbohrung (14) nicht übersteigt, aber auch nicht unter etwa 1 % dieses Durchmessers liegt.6. The method according to claim 3 and 4, characterized in that Q 1 and Q 2 are determined so that the amount of the difference in the piston positions thus determined (s 2 - s 1 ) does not exceed about 2% of the diameter of the transverse bore (14) , but also not less than about 1% of this diameter. 7. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß zur Prüfung der Qualität der Kanten von Pumpenkolben (12) und Querbohrung (14) im besonders kritischen Bereich des Schließpunktes sowie zurErmittlung des Spiels zwischen Pumpenkolben und Zylinder und der diese aufnehmenden Längsbohrung der Schließpunkt (so) angefahren wird und der in dieser Stellung noch vorhandene Durchfluß gemessen wird.7. The method according to claim 1, characterized in that to check the quality of the edges of the pump piston (12) and transverse bore (14) in the particularly critical area of the closing point and to determine the play between the pump piston and cylinder and the longitudinal bore receiving the closing point (s o ) is started up and the flow still present in this position is measured. 8. Verfahren nach einem der Ansprüche 1 bis 7, dadurchgekennzeichnet, daß der Meßablauf durch einen Rechner oder Mikroprozessor gesteuert wird.8. The method according to any one of claims 1 to 7, characterized in that the measuring sequence is controlled by a computer or microprocessor.
EP85110244A 1984-09-22 1985-08-16 Process for detecting the closing point of a transverse bore by a piston in a pump cylinder Withdrawn EP0177715A3 (en)

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

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EP0177715A2 true EP0177715A2 (en) 1986-04-16
EP0177715A3 EP0177715A3 (en) 1989-01-04

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US (1) US4665742A (en)
EP (1) EP0177715A3 (en)
JP (1) JPS6179871A (en)
BR (1) BR8504602A (en)
DE (1) DE3434867A1 (en)

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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

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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

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* Cited by examiner, † Cited by third party
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

Patent Citations (6)

* Cited by examiner, † Cited by third party
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

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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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