EP1352175A2 - Dispositif et procede de mesure de la quantite injectee d'un systeme d'injection, notamment dans le cas de moteurs a combustion interne automobiles - Google Patents

Dispositif et procede de mesure de la quantite injectee d'un systeme d'injection, notamment dans le cas de moteurs a combustion interne automobiles

Info

Publication number
EP1352175A2
EP1352175A2 EP01990325A EP01990325A EP1352175A2 EP 1352175 A2 EP1352175 A2 EP 1352175A2 EP 01990325 A EP01990325 A EP 01990325A EP 01990325 A EP01990325 A EP 01990325A EP 1352175 A2 EP1352175 A2 EP 1352175A2
Authority
EP
European Patent Office
Prior art keywords
piston
measuring
injection
measuring chamber
detection device
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Withdrawn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
EP01990325A
Other languages
German (de)
English (en)
Inventor
Joachim Unger
Wolfram Von Huelsen
Hermann Bolle
Ralf Bindel
Ralf Haas
Dirk Wolf
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1352175A2 publication Critical patent/EP1352175A2/fr
Withdrawn legal-status Critical Current

Links

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
    • F02M65/001—Measuring fuel delivery of a fuel injector

Definitions

  • the present invention relates first of all to a device for measuring the injection quantity of injection systems, in particular for internal combustion engines of motor vehicles and in particular in production testing, with a measuring chamber, a connecting device, by means of which at least one injection system can be connected to the measuring chamber in a pressure-tight manner, with a piston which at least the measuring chamber is delimited in some areas and with a detection device that detects movement of the piston.
  • an EMI injection quantity indicator
  • This consists of a housing in which a piston is guided.
  • the interior of the housing and the piston define a measuring chamber.
  • This has an opening to which an injection system, for example an injector with an injection nozzle, can be attached in a pressure-tight manner. If the injection system injects fuel into the measuring chamber, a fluid in the measuring chamber is displaced. As a result, the piston moves, which is detected by a displacement sensor. Out of the way of the piston can change the volume of the measuring chamber or of the fluid held there, and thereby the amount of fuel injected.
  • the known injection quantity indicator measures with an arrangement of a measuring plunger and an inductive displacement measuring system.
  • the measuring plunger is designed as a probe or is permanently connected to the piston.
  • the measuring plunger is also set in motion, and ultimately the movement of the measuring plunger is detected and a corresponding signal is forwarded to an evaluation unit.
  • the known injection quantity indicator already works with very high accuracy.
  • the unit consisting of the volumetric flask and the plunger has a certain weight, which in turn leads to a certain inertia of this unit.
  • test fluid is injected into the measuring chamber by the injection system, it may therefore be the case that the piston and the measuring plunger attached to it perform a movement which does not exactly reflect the increase in volume of the measuring fluid within the measuring chamber.
  • inaccuracies can therefore occur in the volumetric measurement of injection quantities.
  • the present invention therefore has the task of a
  • This object is achieved in that the detection device works without contact.
  • This measure ensures that when the test fluid is injected into the measuring chamber, essentially only the mass of the piston has to be set in motion, but no measuring plunger or probe has to be moved. In this way, the total mass of the unit to be set in motion during an injection is reduced.
  • the piston can thus react much more spontaneously to a change in volume of the test fluid in the measuring chamber, so the piston stroke can follow the injection volume very directly and without superimposed vibrations.
  • Piston vibrations are lower and decay faster with a given damping of the piston.
  • the load on the piston due to inertial forces is reduced, since no or no significant additional mass adheres to the piston. Deformations of the piston, which can also lead to a measurement error, are thus reduced.
  • the detection device has no parts connected to the piston. In this case, the mass to be set in motion during an injection is minimal, so that the desired effects are again maximum.
  • the detection device work capacitively. This is a particularly simple and precise, non-contact measuring system.
  • the piston or part of the piston forms an electrode of a capacitor.
  • the detection device works inductively and in particular comprises an eddy current sensor.
  • An eddy current sensor generally comprises a semi-open ferrite core on which a magnetic winding is arranged. If an alternating magnetic field is connected to the winding, its field lines emerge from the level of the eddy current sensor, pass through the piston and return to the ferrite core. The alternating magnetic field creates eddy currents in the electrically conductive piston.
  • the detection device can also operate according to the laser triangulation method.
  • the beam from a laser light source is shaped by optics into a narrow beam cone, which at one of the
  • Point of the piston facing the laser light source small, visible point of light. This measurement spot is imaged by the imaging optics on a position-sensitive detector. If the distance between the piston and the laser light source changes, the impact point of the imaging beam on the shifts
  • the distance between the piston and the laser light source or the detector can now be calculated back from the image location.
  • an exposure control must be carried out.
  • a laser interferometer is also suitable for non-contact distance measurement.
  • the device comprises a detection device, which in turn has a laser Doppler vibrometer.
  • a detection device which in turn has a laser Doppler vibrometer.
  • the light from a laser light source is divided into a measuring beam and a reference beam.
  • the measuring beam is aimed at the piston.
  • Part of the backscattered light is directed via optics so that the measuring beam and reference beam overlap.
  • This overlap creates an intensity modulation, the frequency of which is proportional to the speed of movement of the piston.
  • an acousto-optic modulator for example a so-called Bragg cell, can be used. From the speed and a starting position, the distance that the piston has traveled can be calculated.
  • the present invention also relates to a method for measuring the injection quantity of injection systems, in particular for motor vehicles and in particular in production testing, in which a test fluid is injected from an injection system into a measuring chamber and in which the movement caused by the injection leads through a wall of the measuring chamber preloaded piston is detected.
  • the movement of the piston be recorded without contact.
  • This contactless detection of the piston movement can be carried out using any of the methods described above.
  • Figure 1 shows a section through a first
  • Embodiment of a device for measuring the injection quantity of injection systems Embodiment of a device for measuring the injection quantity of injection systems.
  • Figure 2 is a view similar to Figure 1 through a second
  • Embodiment of a device for measuring the injection quantity of injection systems Embodiment of a device for measuring the injection quantity of injection systems.
  • Figure 1 carries a device for measuring the
  • Total injection quantity from injection systems Reference numeral 10. It comprises a centrally arranged body 12, which is held on a sleeve 14. This in turn stands on a base plate 16. The device 10 is fixed on the base plate 16.
  • a substantially central stepped bore 18 is made in the central body 12.
  • a cylindrical insert 20 is inserted, which is supported by a collar 22 on the top of the central body 12.
  • a head 24 is placed on the insert 20 in a pressure-tight manner, into which a stepped bore 26 is likewise made, which in the assembled state shown in FIG. 1 runs coaxially to the stepped bore 18.
  • An adapter 28 is inserted into the stepped bore 26 from above and is sealed off from the stepped bore 26 by O-rings 30.
  • An injection system in the present case an injector 32, with its injection nozzle 33 is inserted into the adapter 28.
  • the injector 32 is in turn connected to a high pressure test fluid supply (not shown).
  • a high pressure test fluid supply not shown.
  • a spray damper 34 is used.
  • the temperature in the lower region of the stepped bore 26 is recorded by a temperature sensor 36.
  • a bore 38 which, in the installation position shown in FIG. 1, extends coaxially to the stepped bore 18 or to the stepped bore 26.
  • a piston 40 is slidably guided in the bore 38. The piston 40 is pressed upwards by a helical spring 42, which is supported on a sensor receptacle 44.
  • Measuring chamber 45 is delimited by the top of piston 40, the lower threadless area of spray damper 34 and the lower area of stepped bore 26.
  • the piston 40 is designed as a closed hollow body.
  • Step bore 46 is present, which is also coaxial to the other step bores 18, 26 and 38 in the installation position shown in Figure 1.
  • a receptacle 48 for a helical spring 54 is screwed onto the underside of the sensor receptacle 44. This receptacle 48 engages with a shoulder 50 in the lower region of the stepped bore 46 and also has a central stepped bore 52 itself.
  • the coil spring 54 is supported on a shoulder of the
  • the sensor holder 56 is overall tubular and an eddy current sensor 58 is screwed into its upper region so that its upper end is a short distance below the lower end of the piston 40 lies.
  • a connection cable 60 of the eddy current sensor 58 is guided through the tubular sensor holder 56 and the receptacle 48 for the coil spring 54 to the outside and to one in the
  • an electromagnetically actuated drain valve 62 is also mounted to the left of the head 24, through which the test fluid can be discharged from the measuring chamber 45.
  • a constant pressure valve 64 is mounted, which ensures an emptying rate of the measuring chamber 45 that is almost independent of the gas pressure below the piston 40 even when the gas pressures below the piston 40 are very different when the electromagnetically actuated emptying valve 62 is open.
  • a further function of the constant pressure valve 64 is to apply the pressure in a groove (without reference number) radially around the piston in the insert 20 slightly lower pressure than to regulate in the measuring chamber 45. Due to the defined low pressure difference between the measuring chamber 45 and the groove, gap leaks between the piston 40 and the insert 20 are almost constant and, moreover, are kept very small. The size of this almost constant small leakage is recorded by software in the evaluation device. Furthermore, the "gas consumption" of the device 10 is reduced by the constant pressure valve 64 when the device 10 is operated with a higher gas pressure under the piston 40 than the ambient air pressure.
  • the device 10 shown in FIG. 1 for measuring the injection quantity of an injection system 32 operates as follows:
  • Test fluid (not shown) is supplied to the injection system 32 and its injection nozzle 33 via the high-pressure test fluid supply and is injected via the spray damper 34 into the measuring chamber 45, which is also filled with test fluid.
  • the spray damper 34 prevents the injection jets from hitting the top of the piston 40 directly. A direct impact of the injection jets on the piston 40 could cause it to vibrate, which does not correspond to the actual course of the injection.
  • the injection of test fluid into the measuring chamber 45 increases the test fluid volume in the measuring chamber 45. The additional volume entering the measuring chamber 45 accelerates the piston 40 downward against the force of the coil spring 42 and the gas pressure below the piston 40. This changes the Distance between the underside of the piston 40 and the eddy current sensor 58.
  • the Eddy current sensor 58 and the underside of the piston 40 will detected by the eddy current sensor 58 in the following manner:
  • the eddy current sensor 58 includes, among other things, a winding (not shown). An alternating magnetic field is applied to the winding. The field lines of this alternating magnetic field penetrate into the lower one
  • Boundary wall or the bottom of the closed piston 40 The magnetic alternating field generates 40 eddy currents in this bottom of the piston.
  • the parts to be moved during an injection can thus be kept as small as possible with regard to their mass. Movement of additional components of the detection device is not necessary. Because of this small moving mass, the piston 40 can be injected from the injection nozzle 33 Essentially follow test fluid volume immediately. This means that even the smallest injection quantities as well as immediately following partial injections can be measured with high accuracy within an overall injection. In addition, the vibrations occurring in the piston 40 are lower and also decay more quickly.
  • FIG. 2 shows a further exemplary embodiment of a device 10 for measuring the injection quantity of injection systems.
  • Components of this type which are functionally equivalent to parts which have already been described and illustrated in connection with FIG. 1 have the same reference symbols in FIG. 2 and are not explained again in detail. For the sake of simplicity, only a few differences between the device 10 shown in FIG. 2 and the device 10 shown in FIG. 1 are discussed in more detail:
  • the piston 40 in FIG. 2 is not closed, but is open on its underside.
  • a central tube 66 is introduced into this opening, coaxially to the piston 40 and to the stepped bore 18.
  • the central tube 66 extends vertically downward from the lower edge region of the piston 40 to approximately the level of the intermediate piece 44.
  • a reference tube 68 is provided, the longitudinal axis of which runs parallel to the longitudinal axis of the central tube 66.
  • the reference tube 68 also extends from the intermediate piece 44 to the lower edge of a cavity 70 which is provided in the central body 12 and is delimited at the top by a cylinder part 71 which is inserted into the stepped bore 18 in the central body 12.
  • Under the intermediate piece 44 is a glass sheet (without reference numerals), which one annular holder 48 is held. This glass pane makes it possible to set a different pressure in the cavity 70 than in the environment.
  • the base plate 16 has a central opening 72 and a holder 74 designed as a web is screwed onto the top of the base plate 16.
  • the ends of two fiber optic light guides 76 and 78 are in turn held by this holder 74.
  • the ends of the light guides 76 and 78 are aligned such that one end is coaxial with the central tube 66 and the other end is coaxial with the reference tube 68.
  • the other ends of the two light guides 76 and 78 which are not visible in FIG. 2, are connected to a laser light source and the further sensors and evaluation electronics of a laser Doppler vibrometer via various optical components.
  • the laser beam transmitted by the light guide 78 and exiting at its end runs coaxially to the central tube 66 and strikes the underside of the upper boundary wall of the piston 40.
  • the corresponding laser beam, which emerges at the end of the light guide 76, is coaxial to the reference tube 68 and radiates against it Underside of cylinder part 71.
  • the measuring beam reflected by piston 40 and the reference beam reflected by cylinder part 71 are superimposed in the optical device.
  • an intensity modulation occurs, the frequency of which is proportional to the speed of movement of the measurement object.
  • an acousto-optical modulator a so-called Bragg cell, is used. From the speed of the piston 40, the path covered by the piston 40 during an injection through the injection nozzle 33 can be determined, from which in turn the "
  • the measuring accuracy of a laser Doppler vibrometer is very high, so that even the smallest injection quantities can be reliably detected.
  • the mass that is to be moved during an injection is very small since the piston 40 is open on the one hand and on the other hand the contactless measuring device does not require any additional parts on the piston 40. It goes without saying that a single-point Doppler laser vibrometer could also be used.
  • the piston forms an electrode of a capacitor.
  • the change in capacity which occurs when the piston 40 moves, could be used to infer the distance covered by the piston 40 and from this again also to the injected amount of fluid.
  • the detection device with a laser triangulation device.
  • a laser interferometer can also be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measuring Volume Flow (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un dispositif (10) destiné à mesurer la quantité injectée de systèmes d'injection (32), notamment dans le cas de moteurs à combustion interne automobiles, et particulièrement dans le contrôle de fabrication. Ledit dispositif est composé d'une chambre de mesure (45), d'une unité de raccordement (28) permettant de relier de manière étanche au moins un système d'injection (32) à la chambre de pression (45), d'un piston (40) s'étendant au travers d'une paroi de la chambre de mesure (45), et d'une unité de détection (58) permettant de détecter un mouvement du piston (40). L'invention vise à améliorer la précision dudit dispositif (10). A cet effet, le système de détection (58) fonctionne sans contact.
EP01990325A 2001-01-08 2001-12-19 Dispositif et procede de mesure de la quantite injectee d'un systeme d'injection, notamment dans le cas de moteurs a combustion interne automobiles Withdrawn EP1352175A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10100459 2001-01-08
DE10100459A DE10100459A1 (de) 2001-01-08 2001-01-08 Vorrichtung und Verfahren zum Messen der Einspritzmenge von Einspritzsystemen, insbesondere für Brennkraftmaschinen von Kraftfahrzeugen
PCT/DE2001/004797 WO2002054038A2 (fr) 2001-01-08 2001-12-19 Dispositif et procede de mesure de la quantite injectee d'un systeme d'injection, notamment dans le cas de moteurs a combustion interne automobiles

Publications (1)

Publication Number Publication Date
EP1352175A2 true EP1352175A2 (fr) 2003-10-15

Family

ID=7669924

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01990325A Withdrawn EP1352175A2 (fr) 2001-01-08 2001-12-19 Dispositif et procede de mesure de la quantite injectee d'un systeme d'injection, notamment dans le cas de moteurs a combustion interne automobiles

Country Status (6)

Country Link
US (1) US20030150259A1 (fr)
EP (1) EP1352175A2 (fr)
JP (1) JP2004516488A (fr)
CN (1) CN1416507A (fr)
DE (1) DE10100459A1 (fr)
WO (1) WO2002054038A2 (fr)

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DE10309440A1 (de) * 2003-03-05 2004-09-16 Robert Bosch Gmbh Verfahren, Vorrichtung und Computerprogramm zum Messen der Leckage von Einspritzsystemen, insbesondere für Brennkraftmaschinen von Kraftfahrzeugen
DE10331228B3 (de) 2003-07-10 2005-01-27 Pierburg Instruments Gmbh Vorrichtung zur Messung von zeitlich aufgelösten volumetrischen Durchflußvorgängen
DE102007049501B4 (de) * 2007-10-15 2015-04-09 Festo Ag & Co. Kg Messvorrichtung zur Bestimmung von Gasmengen und Gasströmen
DE102007059589A1 (de) * 2007-12-11 2009-06-18 Man Diesel Se Vorrichtung und Verfahren zur Erfassung einer Drehlage, insbesondere eines oberen Totpunktes, einer Kurbelwelle einer Hubkolbenbrennkraftmaschine
CN102168706B (zh) * 2010-12-14 2012-11-14 上海阀门厂有限公司 阀门阀瓣开启高度检测仪的过渡接头
US9097226B2 (en) * 2011-08-03 2015-08-04 Omar Cueto Apparatus for connecting a fuel injector to a test machine
US20140149023A1 (en) * 2012-11-29 2014-05-29 Ford Global Technologies, Llc Method and system for engine position control
US20140149018A1 (en) * 2012-11-29 2014-05-29 Ford Global Technologies, Llc Engine with laser ignition and measurement
GB201304704D0 (en) 2013-03-15 2013-05-01 Icon Scient Ltd System and method for analysing vapour pressure
AT512619B1 (de) * 2013-06-26 2015-02-15 Avl List Gmbh Durchflussmessgerät
DE102015201817B4 (de) 2015-02-03 2022-05-05 Ford Global Technologies, Llc Massenstromverlauf CNG Ventil
DE102015225736A1 (de) * 2015-12-17 2017-06-22 Robert Bosch Gmbh Verfahren und Vorrichtung zur Bestimmung der Einspritzrate eines Einspritzventils

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Also Published As

Publication number Publication date
WO2002054038A3 (fr) 2002-09-19
DE10100459A1 (de) 2002-08-01
JP2004516488A (ja) 2004-06-03
CN1416507A (zh) 2003-05-07
WO2002054038A2 (fr) 2002-07-11
US20030150259A1 (en) 2003-08-14

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