EP2209989A2 - Apparatus for detecting leakage of fluid in automobile fuel injectors - Google Patents

Apparatus for detecting leakage of fluid in automobile fuel injectors

Info

Publication number
EP2209989A2
EP2209989A2 EP08836590A EP08836590A EP2209989A2 EP 2209989 A2 EP2209989 A2 EP 2209989A2 EP 08836590 A EP08836590 A EP 08836590A EP 08836590 A EP08836590 A EP 08836590A EP 2209989 A2 EP2209989 A2 EP 2209989A2
Authority
EP
European Patent Office
Prior art keywords
light radiation
previous
light
fluid
containment chamber
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.)
Granted
Application number
EP08836590A
Other languages
German (de)
French (fr)
Other versions
EP2209989B1 (en
Inventor
Raffaela Calabria
Patrizio Massoli
Carmine Ungaro
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.)
AEA Srl
Original Assignee
AEA Srl
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 AEA Srl filed Critical AEA Srl
Priority to PL08836590T priority Critical patent/PL2209989T3/en
Publication of EP2209989A2 publication Critical patent/EP2209989A2/en
Application granted granted Critical
Publication of EP2209989B1 publication Critical patent/EP2209989B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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

Definitions

  • the present invention relates to an apparatus for detecting leakage of fluid in automobile fuel injectors.
  • the present invention relates to an apparatus for detecting leakage of fluid in an injector supplied with a test fluid under pressure ' and provided with an outlet hole, which is obtained in correspondence with an end face of the injector, and cooperates with a shutter that is movable between an open position and a closed position of said outlet hole.
  • the apparatus comprises a light source to irradiate the end face of the injector using light radiation in a given wavelength and a sensing device to measure the intensity of the light radiation reflected by said end face.
  • the output signal of the sensing device is related to the leakage of test fluid from the injector.
  • the known apparatus of the kind described above have several drawbacks mainly deriving from the fact that said apparatus are relatively imprecise since the intensity of the light radiation measured by the sensing device varies with changes in certain uncontrollable parameters during the test such as, for instance, the surface finish of the end face of the injector or interference with the ambient light.
  • figure 1 is a schematic exploded perspective view of a preferred embodiment of the apparatus according to the present invention
  • figure 2 is a perspective view of a detail of the apparatus of figure 1
  • figure 3 is a cross-section of the detail of figure 2.
  • number 1 indicates, as a whole, an apparatus for sensing leakages of fluid in an automobile fuel injector 2 of a known type (figure
  • the apparatus 1 comprises a detector cell 3 comprising, in turn, a plate 4 that is substantially parallelepiped in shape having an upper wall 5 and a lower wall 6 substantially parallel to one another, two side walls 7
  • the plate 4 is also provided with a hole 9, which
  • the 20 has a longitudinal axis 10 substantially orthogonal to the walls 7, extends through the plate 4, and comprises a narrowed central portion 11, two widened end portions 12, arranged on opposite sides of the portion 11, and which open outwardly in correspondence with the walls 7,
  • the portion 11 is axially closed by means of two closing elements 14, which are transparent to light radiation in the ultraviolet light wavelength range, are mounted inside the portions 13 transversely.- ; to the axis 10, are made, preferably, of quartz and define, with said portion 11, a chamber 15 for containing a contrast fluid, preferably a hydrocarbon, which is different to the test fluid contained in the injector 2.
  • two closing elements 14 which are transparent to light radiation in the ultraviolet light wavelength range, are mounted inside the portions 13 transversely.- ; to the axis 10, are made, preferably, of quartz and define, with said portion 11, a chamber 15 for containing a contrast fluid, preferably a hydrocarbon, which is different to the test fluid contained in the injector 2.
  • the contrast fluid and the test fluid have different capacities for absorbing the light radiation in the ultraviolet light wavelength range.
  • the contrast fluid is substantially transparent, and in any case more transparent than the test fluid, to light radiation in the ultraviolet- light wavelength range.
  • the chamber 15 is provided with a feed valve 16, which is mounted in a seat 17 obtained in one of the walls 8 transversely to the axis 10, and communicates with the chamber 15 to feed the contrast fluid into the chamber 15, and an outlet valve 18, which is mounted in a seat 19 obtained in the other wall 8 transversely to the axis 10, and communicates with the chamber 15 to discharge the contrast fluid to the outside of said chamber 15.
  • a feed valve 16 which is mounted in a seat 17 obtained in one of the walls 8 transversely to the axis 10, and communicates with the chamber 15 to feed the contrast fluid into the chamber 15, and an outlet valve 18, which is mounted in a seat 19 obtained in the other wall 8 transversely to the axis 10, and communicates with the chamber 15 to discharge the contrast fluid to the outside of said chamber 15.
  • Each portion 12 internally houses a sleeve 20, which is mounted inside the portion 12 coaxially to the axis 10, and supports a collimating lens (figure 1) mounted inside said sleeve 20.
  • the plate 4 is also provided with a further hole 22, which has a longitudinal axis 23 substantially transversal to the axis 10 and orthogonal to the walls 5 and 6, is limited internally by a stepped face 24 tapered towards the axis 10, opens outwardly in correspondence with the " upper wall 5, and is connected to an intermediate point of the chamber 15.
  • the hole 22 internally houses a cylindrical sleeve 25, which is mounted coaxially to the axis 23, and supports a lower end of the injector 2 to enable said outlet hole (not illustrated) of said injector 2 to communicate hydraulically with the chamber 15.
  • the apparatus 1 also comprises a ' light source 26, which is connected to one of the lenses 21 (hereinafter indicated by 21a) by means of an optical fiber 27, and is suitable to deliver light radiation, preferably pulsed, in the ultraviolet light wavelength range, to the lens 21a, and, thus, to the chamber 15.
  • a ' light source 26 which is connected to one of the lenses 21 (hereinafter indicated by 21a) by means of an optical fiber 27, and is suitable to deliver light radiation, preferably pulsed, in the ultraviolet light wavelength range, to the lens 21a, and, thus, to the chamber 15.
  • the source 26 is connected to the optical fiber 27 by means of the interposition of a filtering device 28 suitable to block the light radiation in the infrared light wavelength range and thus only allow the light radiation in the ultraviolet light wavelength range and visible light to travel along the optical fiber 27.
  • the apparatus 1 also comprises a sensing device 29, which is connected to the other lens 21 (hereinafter indicated by 21b) by means of an optical fiber 30, is suitable to measure the intensity of the light radiation leaving the chamber 15, and, in the specific case, comprises an optical sensor normally referred to as a photodetector .
  • the device 29 is connected to the optical fiber 30 by means of the interposition of a reducing device 31 arranged between the optical fiber 30 and the device 29 to reduce the intensity of the light radiation supplied to the device 29 and a filtering device 32 arranged between the devices 29 and 31 to block the light radiation in the visible light wavelength range and thus only allow the light radiation in the ultraviolet light range to reach the device 29.
  • a reducing device 31 arranged between the optical fiber 30 and the device 29 to reduce the intensity of the light radiation supplied to the device 29 and a filtering device 32 arranged between the devices 29 and 31 to block the light radiation in the visible light wavelength range and thus only allow the light radiation in the ultraviolet light range to reach the device 29.
  • the light radiation emitted by the source 26 is supplied in the first instance through the filtering device 28, then along the optical fiber 27 and finally through the collimating lens 21a in order to pass through the containment chamber 15 with a substantially cylindrical shape.
  • the light radiation leaving the containment chamber 15 is then supplied in the first instance through the collimating lens 21b in order to alter its cylindrical shape, then along the optical fiber 30, through the reducing device 31 and the filtering device 32, and finally to the sensing device 29, which sends an output signal proportional to the intensity of said light radiation.
  • the intensity of the light radiation measured by the device 29, and, thus, the output signal of said device 29 vary according to the contents of the chamber 15.
  • the presence of test fluid in the chamber 15 determines a partial absorption of the light radiation supplied through said chamber 15 and, thus, a different output signal of the device 29.
  • the output signals of the device 29 can be used to plot a characteristic curve in which each output signal of the device 29 corresponds to a given quantity of test fluid in • the chamber 15 and, thus, a given leakage from the injector 2, and to calculate the leakages from the injector 2 over a given period of time and, thus, the mean leakage from said inj ector 2.
  • the apparatus 1 comprises a sensing device completely identical to the sensing device 29 and a light dividing device arranged between the light source 26 and the filtering device 28 to selectively supply the light radiation emitted by the light source 26 partly to the filtering device 28 and partly to said sensing device in order to measure the intensity of the light radiation emitted by said light source 26.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Examining Or Testing Airtightness (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

Leakage of fluid in an automobile fuel injector (2) is detected by connecting the injector (2) on one side to a device for feeding a test fluid under pressure and on the other to a chamber (15) containing a contrast fluid different to the test fluid, supplying light radiation through the containment chamber (15), and measuring the intensity of the light radiation when it leaves said containment chamber (15).

Description

APPARATUS FOR DETECTING LEAKAGE OF FLUID IN AUTOMOBILE FUEL INJECTORS
TECHNICAL FIELD • The present invention relates to an apparatus for detecting leakage of fluid in automobile fuel injectors. In particular, the present invention relates to an apparatus for detecting leakage of fluid in an injector supplied with a test fluid under pressure 'and provided with an outlet hole, which is obtained in correspondence with an end face of the injector, and cooperates with a shutter that is movable between an open position and a closed position of said outlet hole.
The apparatus comprises a light source to irradiate the end face of the injector using light radiation in a given wavelength and a sensing device to measure the intensity of the light radiation reflected by said end face.
Since the intensity of the light radiation reflected by the end face of the injector varies according to the amount of test fluid that is present on said end face, the output signal of the sensing device is related to the leakage of test fluid from the injector. BACKGROUND ART
The known apparatus of the kind described above have several drawbacks mainly deriving from the fact that said apparatus are relatively imprecise since the intensity of the light radiation measured by the sensing device varies with changes in certain uncontrollable parameters during the test such as, for instance, the surface finish of the end face of the injector or interference with the ambient light.
DISCLOSURE OF INVENTION
It is an object of the present invention to provide an apparatus for detecting leakage of fluid in automobile fuel injectors that overcomes the drawbacks described above and is simple and inexpensive to produce .
According to the present invention there is provided an apparatus for detecting- leakage of fluid in automobile fuel injectors as set forth in the claims. BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described with reference to the attached drawings, illustrating a non- limiting embodiment thereof, in which: figure 1 is a schematic exploded perspective view of a preferred embodiment of the apparatus according to the present invention; figure 2 is a perspective view of a detail of the apparatus of figure 1; and figure 3 is a cross-section of the detail of figure 2.
BEST MODE FOR CARRYING OUT THE INVENTION
With reference to figure 1, number 1 indicates, as a whole, an apparatus for sensing leakages of fluid in an automobile fuel injector 2 of a known type (figure
2), which, is connected to a device (not illustrated) for supplying a test fluid under pressure capable of absorbing, in the same way as the fuel used in
5 automobiles, light radiation in the ultraviolet light wavelength range, and is provided with an outlet hole
(not illustrated) which cooperates with a shutter (not illustrated) movable between an open position and a closed position of said outlet hole (not illustrated) .
10 According to that illustrated in figures 2 and 3, the apparatus 1 comprises a detector cell 3 comprising, in turn, a plate 4 that is substantially parallelepiped in shape having an upper wall 5 and a lower wall 6 substantially parallel to one another, two side walls 7
'15 substantially parallel to one another and orthogonal to the walls 5 and 6, and two side walls 8 substantially parallel to one another and orthogonal to the walls 5, 6 and 7.
The plate 4 is also provided with a hole 9, which
20 has a longitudinal axis 10 substantially orthogonal to the walls 7, extends through the plate 4, and comprises a narrowed central portion 11, two widened end portions 12, arranged on opposite sides of the portion 11, and which open outwardly in correspondence with the walls 7,
25 and two intermediate portions 13 connecting the portion 11 to the portions 12.
The portion 11 is axially closed by means of two closing elements 14, which are transparent to light radiation in the ultraviolet light wavelength range, are mounted inside the portions 13 transversely.-;to the axis 10, are made, preferably, of quartz and define, with said portion 11, a chamber 15 for containing a contrast fluid, preferably a hydrocarbon, which is different to the test fluid contained in the injector 2.
In particular, the contrast fluid and the test fluid have different capacities for absorbing the light radiation in the ultraviolet light wavelength range. In the specific case, the contrast fluid is substantially transparent, and in any case more transparent than the test fluid, to light radiation in the ultraviolet- light wavelength range.
The chamber 15 is provided with a feed valve 16, which is mounted in a seat 17 obtained in one of the walls 8 transversely to the axis 10, and communicates with the chamber 15 to feed the contrast fluid into the chamber 15, and an outlet valve 18, which is mounted in a seat 19 obtained in the other wall 8 transversely to the axis 10, and communicates with the chamber 15 to discharge the contrast fluid to the outside of said chamber 15.
Each portion 12 internally houses a sleeve 20, which is mounted inside the portion 12 coaxially to the axis 10, and supports a collimating lens (figure 1) mounted inside said sleeve 20.
The plate 4 is also provided with a further hole 22, which has a longitudinal axis 23 substantially transversal to the axis 10 and orthogonal to the walls 5 and 6, is limited internally by a stepped face 24 tapered towards the axis 10, opens outwardly in correspondence with the "upper wall 5, and is connected to an intermediate point of the chamber 15.
The hole 22 internally houses a cylindrical sleeve 25, which is mounted coaxially to the axis 23, and supports a lower end of the injector 2 to enable said outlet hole (not illustrated) of said injector 2 to communicate hydraulically with the chamber 15.
With reference to figure 1, the apparatus 1 also comprises a' light source 26, which is connected to one of the lenses 21 (hereinafter indicated by 21a) by means of an optical fiber 27, and is suitable to deliver light radiation, preferably pulsed, in the ultraviolet light wavelength range, to the lens 21a, and, thus, to the chamber 15.
The source 26 is connected to the optical fiber 27 by means of the interposition of a filtering device 28 suitable to block the light radiation in the infrared light wavelength range and thus only allow the light radiation in the ultraviolet light wavelength range and visible light to travel along the optical fiber 27.
The apparatus 1 also comprises a sensing device 29, which is connected to the other lens 21 (hereinafter indicated by 21b) by means of an optical fiber 30, is suitable to measure the intensity of the light radiation leaving the chamber 15, and, in the specific case, comprises an optical sensor normally referred to as a photodetector .
The device 29 is connected to the optical fiber 30 by means of the interposition of a reducing device 31 arranged between the optical fiber 30 and the device 29 to reduce the intensity of the light radiation supplied to the device 29 and a filtering device 32 arranged between the devices 29 and 31 to block the light radiation in the visible light wavelength range and thus only allow the light radiation in the ultraviolet light range to reach the device 29.
In use, the light radiation emitted by the source 26 is supplied in the first instance through the filtering device 28, then along the optical fiber 27 and finally through the collimating lens 21a in order to pass through the containment chamber 15 with a substantially cylindrical shape.
The light radiation leaving the containment chamber 15 is then supplied in the first instance through the collimating lens 21b in order to alter its cylindrical shape, then along the optical fiber 30, through the reducing device 31 and the filtering device 32, and finally to the sensing device 29, which sends an output signal proportional to the intensity of said light radiation.
The intensity of the light radiation measured by the device 29, and, thus, the output signal of said device 29 vary according to the contents of the chamber 15. Thus, in case of leakages from the injector 2, the presence of test fluid in the chamber 15 determines a partial absorption of the light radiation supplied through said chamber 15 and, thus, a different output signal of the device 29.
The output signals of the device 29 can be used to plot a characteristic curve in which each output signal of the device 29 corresponds to a given quantity of test fluid in • the chamber 15 and, thus, a given leakage from the injector 2, and to calculate the leakages from the injector 2 over a given period of time and, thus, the mean leakage from said inj ector 2.
According to an alternative embodiment that is not illustrated, the apparatus 1 comprises a sensing device completely identical to the sensing device 29 and a light dividing device arranged between the light source 26 and the filtering device 28 to selectively supply the light radiation emitted by the light source 26 partly to the filtering device 28 and partly to said sensing device in order to measure the intensity of the light radiation emitted by said light source 26.

Claims

C L A I M S
1. - Apparatus for detecting leakage of fluid in automobile fuel injectors (2), the apparatus being characterized in that it comprises a chamber (15) , which contains a contrast fluid, and is connected to an injector (2) to which a test fluid different to the contrast fluid is delivered under pressure; a light source (26) to supply light radiation through the containment chamber (15); and a sensing device (29) to measure the intensity of the light radiation upon leaving said chamber (15).
2. - Apparatus according to claim 1 , wherein the contrast fluid and the test fluid have different capacities for absorbing the light radiation emitted by the light source (26) .
3. - Apparatus according to claim 1 or 2 , wherein the light source (26) is suitable to emit light radiation mainly comprised in the ultraviolet wavelength range .
4.- Apparatus according to any one of the previous claims, wherein the light source (26) is suitable to emit a pulsed light radiation.
5. - Apparatus according to any one of the previous claims, wherein the test fluid has a given capacity to absorb light radiation in the ultraviolet wavelength range .
6. - Apparatus according to any one of the previous claims, wherein the contrast fluid is a fluid that is substantially transparent to light radiation in the ultraviolet wavelength range.
7. - Apparatus according to any one of the previous claims, wherein the sensing device (29) comprises an optical element (29) suitable to send an output signal proportional to the intensity of the light radiation leaving the containment chamber (15) .
8. - Apparatus according to any one of the previous claims and also comprising a first optical fiber transmission device (27) to optically connect the light source (26) and the containment chamber (15) to one another .
9. - Apparatus according to any one of the previous claims and also comprising a second optical fiber transmission device (30) to optically connect the containment chamber (15) and the sensing device (29) to one another .
10.- Apparatus according to any one of the previous claims and also comprising a first collimating lens (21a) to give a given shape to the light radiation entering the containment chamber (15) .
11.- Apparatus according to any one of the previous claims and also comprising a second collimating lens (21b) to give a given shape to the light radiation leaving the containment chamber (15) .
12. - Apparatus according to any one of the previous claims and also comprising a first filtering device (28) arranged ■ between the light source (26) and the containment chamber (15) to block the light radiation in the infrared light wavelength range.
13.- Apparatus according to claim 12 and also comprising a further sensing device and a light dividing device arranged between the light source (26) and the first filtering device (28) to selectively supply the light radiation emitted by the light source (26) in part to the first filtering device (28) and in part to said further sensing device in order to measure the intensity of the light radiation emitted by said light source (26) .
14.- Apparatus according to any one of the previous claims and also comprising a reducing device (31) to reduce the intensity of the light radiation leaving the containment chamber (15) and entering the sensing device • (29) .
15.- Apparatus according to any one of the previous claims and also comprising a second filtering device (32) arranged between the containment chamber (15) and the sensing device (29) to block the light radiation in the visible light wavelength range.
EP08836590A 2007-10-02 2008-10-02 Apparatus for detecting leakage of fluid in automobile fuel injectors Not-in-force EP2209989B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08836590T PL2209989T3 (en) 2007-10-02 2008-10-02 Apparatus for detecting leakage of fluid in automobile fuel injectors

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000670A ITBO20070670A1 (en) 2007-10-02 2007-10-02 EQUIPMENT FOR DETECTION OF LIQUID LEAKS IN INJECTORS FOR AUTOMOTIVE USE
PCT/IB2008/002597 WO2009044261A2 (en) 2007-10-02 2008-10-02 Apparatus for detecting leakage of fluid in automobile fuel injectors

Publications (2)

Publication Number Publication Date
EP2209989A2 true EP2209989A2 (en) 2010-07-28
EP2209989B1 EP2209989B1 (en) 2012-02-01

Family

ID=40313578

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08836590A Not-in-force EP2209989B1 (en) 2007-10-02 2008-10-02 Apparatus for detecting leakage of fluid in automobile fuel injectors

Country Status (5)

Country Link
EP (1) EP2209989B1 (en)
AT (1) ATE544001T1 (en)
IT (1) ITBO20070670A1 (en)
PL (1) PL2209989T3 (en)
WO (1) WO2009044261A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2455604B1 (en) * 2010-11-22 2015-07-22 Continental Automotive GmbH Measuring apparatus and method for determining a leakage of an injection valve

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3128072A1 (en) * 1980-11-08 1982-06-24 Robert Bosch Gmbh, 7000 Stuttgart TEST STAND FOR TESTING INJECTION NOZZLES
DE3817096A1 (en) * 1987-05-29 1988-12-08 Volkswagen Ag METHOD FOR TESTING INJECTION VALVES AND DEVICE FOR CARRYING OUT THE METHOD
DE4026228C1 (en) * 1990-08-18 1991-08-22 Robert Bosch Gmbh, 7000 Stuttgart, De
KR100559382B1 (en) * 2003-05-15 2006-03-10 현대자동차주식회사 Micro-leak leak inspection system and control method of diesel engine fuel injection system
GB2431715B (en) * 2005-10-25 2009-08-26 Managed Technologies Ltd Apparatus and method for the detection of leaks

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009044261A2 *

Also Published As

Publication number Publication date
WO2009044261A2 (en) 2009-04-09
ITBO20070670A1 (en) 2009-04-03
ATE544001T1 (en) 2012-02-15
WO2009044261A3 (en) 2009-05-28
EP2209989B1 (en) 2012-02-01
PL2209989T3 (en) 2012-07-31

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