EP1954938A1 - Verfahren und vorrichtung zur messung der einspritzmenge und der einspritzrate eines einspritzventils für flüssigkeiten - Google Patents
Verfahren und vorrichtung zur messung der einspritzmenge und der einspritzrate eines einspritzventils für flüssigkeitenInfo
- Publication number
- EP1954938A1 EP1954938A1 EP06807073A EP06807073A EP1954938A1 EP 1954938 A1 EP1954938 A1 EP 1954938A1 EP 06807073 A EP06807073 A EP 06807073A EP 06807073 A EP06807073 A EP 06807073A EP 1954938 A1 EP1954938 A1 EP 1954938A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injection
- measuring volume
- sound
- measuring
- pressure
- 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
Links
- 238000002347 injection Methods 0.000 title claims abstract description 85
- 239000007924 injection Substances 0.000 title claims abstract description 85
- 239000007788 liquid Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 19
- 230000001419 dependent effect Effects 0.000 claims abstract description 4
- 230000005236 sound signal Effects 0.000 claims description 8
- 239000000446 fuel Substances 0.000 claims description 7
- 238000005259 measurement Methods 0.000 abstract description 18
- 230000010355 oscillation Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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
- DE 100 64 511 A1 discloses the measuring piston principle, in which the injection valve injects fuel into a measuring volume filled with a test medium.
- the pressure in the measuring volume is kept constant by displacing a volumetric flask by the injection quantity. From the displacement of the volumetric flask, the injection quantity can then be calculated directly.
- This method is dynamically limited because of the mechanical piston movement and can therefore not meet the increasing demands for time-resolved measurement of the injection rate in modern high-pressure injection systems for internal combustion engines, which often comprise multiple partial injections per injection cycle.
- the injected fuel causes pressure oscillations in the corresponding natural frequencies of the measuring volume, these natural frequencies being dependent on the geometric dimensions of the measuring volume.
- these natural frequencies being dependent on the geometric dimensions of the measuring volume.
- many harmonics are usually excited, with several vibration modes are usually possible. This makes it difficult to filter the pressure sensor measurement signal, since the frequencies of the natural oscillations are partly in the range of the frequencies of the measurement signal.
- the method according to the invention with the features of claim 1, however, has the advantage that it is possible to determine very precisely both the injection quantity and the course of the injection, that is to say the injection rate, from the course of the pressure.
- the time course of the pressure in the measuring volume is recorded during the injection and, moreover, the speed of sound is measured at least before and after the injection. From these quantities, the mentioned quantities can be calculated with high accuracy.
- the speed of sound is determined by emitting a sound pulse from a sound transducer into the measurement volume, which is reflected at the opposite, parallel base surface and, in turn, received as an echo by the sound transducer. From the length of the measurement volume and the duration of the sound signal can be calculated directly the speed of sound. Because of the long running distance and thus large time, the measured variables are subject to a relatively small error.
- the device according to the invention has the advantage over the prior art that a sound transducer provided in the measuring volume simultaneously serves as a sound generator and as a sound receiver. Since this eliminates a separate sound receiver, this arrangement is cheaper and it also eliminates the implementation of a signal cable, would otherwise be routed to the measurements of the sound receiver to the electronic computer.
- FIG. 1 shows the measuring device with the schematically represented components and Figure 2 shows the diagram of a measurement, wherein the pressure and its derivative are plotted over time.
- the measuring device is shown in a partially sectioned view.
- a cylindrical measuring volume 1 with a wall 2 is completely filled with a test liquid, wherein the measuring volume 1 is completed on all sides.
- the wall 2 has a first base area 102 and a second base area 202, which are connected by a cylindrical side wall 303, which has a longitudinal axis 4.
- An injection valve 3 protrudes with its tip into the measuring volume 1 through an opening 10 in the first base area 102 of the wall 2, wherein the passage of the injection valve 3 through the wall 2 is closed in a liquid-tight manner.
- the injection valve 3 has a valve body 7 in which a piston-shaped valve needle 5 is arranged longitudinally displaceably in a bore 6.
- Valve needle 5 are closed again.
- the injection of the test liquid takes place here with a high pressure, which may be more than 200 MPa depending on the injection valve used.
- a holder 22 projects through the wall 2 into the measuring volume 1.
- a pressure sensor 20 is arranged, which is connected via a signal line 24, which is led out of the measuring volume 1 in the holder 22, with an electronic computer 28, wherein the passage of the holder 22 through the wall 2 flüs - stechniksdicht is closed.
- the pressure sensor 20 is arranged in the median plane between the two base surfaces 102, 202 and thus has the same distance to both base surfaces 102, 202.
- the signal representing the pressure supplied by the pressure sensor 20 can be read out and stored electronically. To enable a quick measurement of the pressure curve, the
- Pressure sensor 20 for example, built on a piezo-based, so that even rapid changes in pressure without significant delay can be measured.
- a transducer 30 is arranged, which can both send sound signals and receive the associated echo. The sent
- Sound signal is reflected at the base surface 202 opposite the transducer 30 and thus passes twice the length of the measuring volume 1, before it is detected by the transducer 30 as an echo.
- a separate sound receiver 31 is arranged on the base surface 202 opposite to the sound converter 30. This allows two measurements of the speed of sound in a very short time interval: The speed of sound is determined on the one hand from the duration of the sound signal from the sound transducer 30 to the sound receiver 31. On the other hand, from the transit time of the sound signal reflected from the base 202 to the sound transducer 30, a second measurement can be taken which immediately follows the first time. This makes it possible to measure the speed of sound in a very short time interval and with a correspondingly small measuring volume because of multiple reflections at the base areas 102, 202 even during the duration of an injection.
- the injection quantity ⁇ m of the test liquid to be measured can be calculated from the pressure increase and the sound velocity. If p is the density of the test liquid and V is the volume of the measured volume, the injection of a quantity ⁇ m of test liquid at constant volume V results in a change in the density ⁇ p, so that the following applies
- the wall 2 of the measuring volume 2 can be regarded as inelastic in a good approximation and thus V can be regarded as constant.
- V can be regarded as constant.
- the speed of sound c depends on the pressure p in the measuring volume 1.
- the injected quantity m then results from integration with the aid of the above-mentioned relationships
- the time course of the pressure p (t) is measured, from which in turn the injection rate r (t) can be determined, ie the amount dm (t) of the test liquid injected per unit time dt. From equation II, the following equation results for the injection rate r (t), ie the time derivative of the injected quantity dm (t) / dt:
- the pressure in the measuring volume 1 increases. Liquids are virtually incompressible compared to gases, so that even a small increase in volume leads to a well-measurable pressure increase. It should be noted that the speed of sound depends on the pressure p and this in turn on the time t. Since the injection process is very short and is usually completed in a time period of 1 to 2 ms, the speed of sound can be controlled during the
- the procedure is as follows: Into the measuring volume 1, in which the test liquid is located, the injection valve 3 is injected by a rapid longitudinal movement of the valve needle 5, through which the injection openings 12 are opened and be closed again, a certain amount of liquid.
- the pressure sensor 20 measures the pressure p (t) which is read out and stored by the computer 28 at a specific rate of, for example, 100 kHz.
- equation III In order to determine the time course of the injection quantity dm (t) / dt and thus the injection rate r (t), equation III is used.
- the measured values p (t) stored in the computer are converted into a sound velocity, so that the integral can be calculated according to equation III.
- This provides a function of time t, which is then numerically differentiated, giving the injection rate r (t).
- the speed of sound c is determined in a separate procedure.
- a sound pulse is emitted by the sound transducer 30, which is reflected at the opposite base surface 202 of the measuring volume 1 and is collected as an echo after a running time t L again from the transducer. From the distance s of sound transducer 30 and base 202 then calculated after
- FIG. 2 shows the time profile of the pressure p (t) and its derivative dp (t) / dt as a function of the time t in arbitrary units U.
- the second partial injection of the first follows at a distance of about 1 ms.
- an injector is used as used for direct-injection, auto-ignition internal combustion engines, this corresponds to fuel injection subdivided into a pilot or pilot injection and a subsequent main injection.
- the evaluation according to equation III results in the injection rate r (t).
- the measurement method together with the described measurement setup thus makes it possible to measure the pressure profile and to determine the speed of sound c at the current test conditions. determine the conditions from which the injection quantity and the injection rate can be determined.
- the test liquid may be fuel or another liquid whose properties approximate the liquid used in normal use of the injection valve.
- the measuring volume 1 does not have to be cylindrically shaped, but instead may also be cuboid or in another suitable shape, for example spherical.
- the pressure sensor may in principle be mounted at any point in all forms of the measuring volume 1, but direct admission to the injected fuel should be avoided.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Measuring Volume Flow (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005056153A DE102005056153A1 (de) | 2005-11-23 | 2005-11-23 | Verfahren und Vorrichtung zur Messung der Einspritzmenge und der Einspritzrate eines Einspritzventils für Flüssigkeiten |
PCT/EP2006/067181 WO2007060055A1 (de) | 2005-11-23 | 2006-10-09 | Verfahren und vorrichtung zur messung der einspritzmenge und der einspritzrate eines einspritzventils für flüssigkeiten |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1954938A1 true EP1954938A1 (de) | 2008-08-13 |
EP1954938B1 EP1954938B1 (de) | 2010-04-07 |
EP1954938B2 EP1954938B2 (de) | 2014-08-27 |
Family
ID=37387346
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06807073.9A Active EP1954938B2 (de) | 2005-11-23 | 2006-10-09 | Verfahren und vorrichtung zur messung der einspritzmenge und der einspritzrate eines einspritzventils für flüssigkeiten |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1954938B2 (de) |
AT (1) | ATE463671T1 (de) |
DE (2) | DE102005056153A1 (de) |
WO (1) | WO2007060055A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111946517A (zh) * | 2020-08-07 | 2020-11-17 | 哈尔滨工程大学 | 一种可变量程的燃油喷射规律测量仪 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010002898A1 (de) * | 2010-03-16 | 2011-09-22 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Bewertung eines Einspritzorgans |
DE102011081544A1 (de) | 2011-07-15 | 2013-01-17 | Robert Bosch Gmbh | Messverfahren und Messvorrichtung zur Druckbestimmung von Flüssigkeiten |
DE102015201817B4 (de) | 2015-02-03 | 2022-05-05 | Ford Global Technologies, Llc | Massenstromverlauf CNG Ventil |
DE102015209398A1 (de) | 2015-05-22 | 2016-11-24 | Robert Bosch Gmbh | Vorrichtung zur Messung der Einspritzrate, Verfahren zur Herstellung einer solchen Vorrichtung sowie Messverfahren |
DE102018203542A1 (de) * | 2018-03-08 | 2019-09-12 | Volkswagen Aktiengesellschaft | Verfahren zur Diagnose einer Einspritzvorrichtung für eine Verbrennungskraftmaschine |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10064511C2 (de) * | 2000-12-22 | 2002-11-21 | Bosch Gmbh Robert | Vorrichtung, Verfahren und Computerprogramm zum Messen der Einspritzmenge von Einspritzsystemen, insbesondere für Brennkraftmaschinen von Kraftfahrzeugen |
DE10249754A1 (de) * | 2002-10-25 | 2004-05-06 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Messung der Einspritzrate eines Einspritzventils für Flüssigkeiten |
DE10310114A1 (de) † | 2003-03-06 | 2004-09-16 | Robert Bosch Gmbh | Vorrichtung und Verfahren zur hydrostatischen Druckbestimmung in einem Hochdruckbehälter mittels Ultraschalllaufzeitmessung |
-
2005
- 2005-11-23 DE DE102005056153A patent/DE102005056153A1/de not_active Ceased
-
2006
- 2006-10-09 WO PCT/EP2006/067181 patent/WO2007060055A1/de active Application Filing
- 2006-10-09 EP EP06807073.9A patent/EP1954938B2/de active Active
- 2006-10-09 AT AT06807073T patent/ATE463671T1/de active
- 2006-10-09 DE DE502006006663T patent/DE502006006663D1/de active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2007060055A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111946517A (zh) * | 2020-08-07 | 2020-11-17 | 哈尔滨工程大学 | 一种可变量程的燃油喷射规律测量仪 |
Also Published As
Publication number | Publication date |
---|---|
DE102005056153A1 (de) | 2007-05-24 |
EP1954938B2 (de) | 2014-08-27 |
DE502006006663D1 (de) | 2010-05-20 |
EP1954938B1 (de) | 2010-04-07 |
WO2007060055A1 (de) | 2007-05-31 |
ATE463671T1 (de) | 2010-04-15 |
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