EP2126336A1 - Testvorrichtung und verfahren zur überprüfung von einspritzkomponenten - Google Patents
Testvorrichtung und verfahren zur überprüfung von einspritzkomponentenInfo
- Publication number
- EP2126336A1 EP2126336A1 EP08701497A EP08701497A EP2126336A1 EP 2126336 A1 EP2126336 A1 EP 2126336A1 EP 08701497 A EP08701497 A EP 08701497A EP 08701497 A EP08701497 A EP 08701497A EP 2126336 A1 EP2126336 A1 EP 2126336A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- generating unit
- pump
- unit
- pressure generating
- 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
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
-
- 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
- F02M65/003—Measuring variation of fuel pressure in high pressure line
-
- 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
- F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing
Definitions
- the invention is based on a test device for testing a first ⁇ ffhungs réellees a nozzle holder combination. This is used to measure a first opening pressure of a connected nozzle holder combination to be tested. To measure the second ⁇ ffhungstiks the nozzle holder combination another, additional tester is used.
- systems that include a test oil supply, a series pump, a pressure measurement, an electrical evaluation and an optional temperature control are used to test nozzle holder combinations.
- an injector may be used in an internal combustion engine instead of a nozzle holder combination as an injection component.
- another tester is necessary.
- the system for testing injectors includes a test oil supply, a pressure generator by means of a drive and a high-pressure pump, an electrical control of the injector, a volume measuring system and a pressure and temperature control.
- the invention enables the verification of injection components of various types with a single device. Further, the invention enables the measurement of various characteristics of an injection component type by means of a single device. In particular, the invention makes it possible to measure the first and second opening pressures of a nozzle holder combination with one and the same system. Furthermore, the invention enables the inspection of nozzle holder combinations and injectors with one and the same device. According to the invention, the same device is used to check the pressure characteristic of a nozzle holder combination as to check the pressure characteristic, the injection quantity and the return quantity of an injector.
- the test device comprises a pressure generating unit, which is used in a first operating mode for checking injectors and therefore builds up a time pressure curve, which corresponds to the usual operation of injectors.
- the same pressure generating unit is used in a second operating mode to build up a pressure profile corresponding to the pressure curve of nozzle holder combinations in normal operation, wherein in the second operating mode, the pressure generating unit is driven to replicate the pressure profile of a series pump.
- a pressure generating unit is used according to the invention, which can simulate the operation or certain operating states of different injection components by appropriate control, whereby the test device for many different injection components can be used.
- a pressure generating unit is in particular a common rail high-pressure pump, which is used according to the prior art only for the review of common rail injectors.
- the high pressure pump is also used to check nozzle holder combinations, wherein not the high pressure pump, but only their control is modified such that the high pressure pump simulates the behavior of a series pump.
- the pressure generating unit of an injector test system is also suitable for testing the first and second opening pressures of a nozzle holder combination. Due to the electrical control of the pressure generating unit used for injectors, the behavior of the pressure generating unit can be changed by the control, without physical or mechanical changes to the pressure generating unit are necessary. In this way, by a suitable control of the pressure generating unit, for example, the behavior of a series pump can be simulated, which is used as a pressure generating unit in a test system for nozzle holder combinations.
- the pressure generating unit which is initially provided for injectors, driven such that it also simulates a behavior of Druckmaschineungsech en that simulate for checking nozzle holder combinations with a pen, nozzle holder combinations with two spring holders, stage holders, unit injectors and injectors with a magnetic coil ,
- the pressure generating unit is controlled in such a way that it simulates a pressure generating unit for test systems for injectors with two magnet coils or injectors with a piezoactuator.
- first opening pressure describes the pressure at which a first advance is achieved, in which a small exit cross section is released, in other words, at the first opening pressure, a point is reached where minimal fuel flow through the nozzle holder combination occurs
- second opening pressure is reached, which marks the exceeding of a pressure at which the stroke of a nozzle needle increases, thus releasing a larger cross-section
- the second opening pressure can be recognized, in which a flattening of the pressure increase occurs
- a low flow rate can be ascertained, after which an increasing and higher flow rate can be ascertained once the opening pressure has been reached so generate all relevant pressure values and it can be one - A -
- Characteristic are generated in the same time the flow rate is measured and recorded.
- a pulsed volume flow can be determined by means of a suitable integrating volume flow meter which has a very low measuring inertia in order to be able to follow the rapidly increasing and decreasing pressure and flow rate flanks.
- the pulsed volume flow can be smoothed by using a flexible hydraulic volume.
- a flexible hydraulic volume Such a volume may be created in which the volume-enclosing surface has a diaphragm which is spring-supported. In this case, the springs can absorb and compensate for the fast pressure flanks.
- the volume flow is directed by such a flexible hydraulic volume, and then by a throttle, which leads to a further smoothing, in particular in connection with the hydraulic volume.
- the throttle may be provided by a thin thin-walled tube extending in the form of a cooling coil, which is preferably arranged in a temperature-controlled test oil tank.
- a volumetric flow meter is connected to the restrictor, whereby the smoothed volumetric flow also makes it possible to use slower measuring instruments, for example gear flow meters.
- the spring force on the membrane is preferably applied to the membrane surface facing away from the hydraulic volume by means of a pressure plate.
- a channel or another volume can be provided which is connected to the environment or to a pressurized volume for pressure equalization directly or via a throttle.
- the test device comprises a control unit and a measuring device which measures the pressure and the flow rate to or through the injection component to be tested.
- the measuring device comprises a pressure sensor.
- this measuring device is used not only for checking injectors but also of injection nozzles, for example nozzle holder combinations, stage holders and the like.
- the controller is arranged to control the injection components of various types according to their respective type such that the normal operation, a certain usual operating point or a Critical operating point is driven in each case depending on the type of injection component.
- the control unit preferably controls the pressure generating unit such that the corresponding operating state is present at the injection component to be checked.
- the measuring device is also flexible with regard to the injection component type to be checked and further preferably measures the pressure and the flow rate of the pressure generating unit or these and other physical variables at the outlet of the injection component to be checked or on the test object holding unit.
- the test device comprises an evaluation unit, which is preferably connected to the control unit and / or to the measuring device and evaluates the measured values in accordance with the set physical variables with an evaluation method that depends on the type of injection pump. Since an operating state is provided for the injection component that corresponds to the usual test system used for this type, the evaluation process can be carried out by type-specific test devices, and the methods can be combined in one device.
- the control takes place via a measuring and control circuit board.
- the acquired data for example, the data of the control unit, the pressure generating unit and / or the measuring device are transmitted to a central control unit and evaluated there.
- the central control unit comprises a control PC with corresponding software.
- the control PC and the software running therein assume the control of the pressure generating unit, the control of the injection components and the data acquisition of the measurement data originating from the measuring device, the control unit and / or the pressure generating unit.
- the acquired data are displayed graphically, for example the pressure profiles.
- the test device comprises a common operating part.
- test device comprises a sketchling-holding unit which is adapted to hold the injection component to be checked.
- adapters or fittings are provided to connect the injection component sealed depending on the type of the test device.
- Figure 1 is an overview diagram of a first embodiment of the invention
- FIG. 2 is an overview diagram of a second embodiment of the invention
- FIG. 3 shows an overview circuit diagram of a third embodiment of the invention
- Figure 4 shows a technical implementation of the test device according to the invention
- FIG. 1 shows a common-rail (CR) high-pressure pump 10 which supplies a buffer volume 20 with pressurized test oil.
- a test oil tank (not shown) is connected, from which the high-pressure CR pump 10, the oil, with which the buffer volume 20 is supplied.
- a valve or throttle 30 Connected to the buffer volume is a valve or throttle 30, the flow rate of which can be controlled electrically (or mechanically or hydraulically) and, in the open operating state, supplies a test specimen holding unit 40 with the pressurized test oil.
- the CR high-pressure pump 10 is actuated by a control unit 50, so that the control unit determines the pressure and / or the flow rate of the CR High pressure pump 10 controls.
- control unit 50 controls the flow rate through the electrically controllable throttle 30.
- an input of a test object is connected to the test object mounting unit 40, wherein a measuring device is connected to an output of the test object.
- the measuring device is connected to the control unit 50 in order to enable a feedback and thus the maintenance of a certain operating interval or operating point.
- the sample holding unit 40 is configured to receive injection components of the same type of various sizes and injection components of various types and sizes.
- the measuring device is equipped to be coupled to the DUT.
- the coupling of the strigling-mounting unit to the device under test and / or the coupling of the measuring device to the device under test can be provided via an adapter that fits different sizes and different types.
- the controller 50 may control the high pressure pump 10 so that the buffer volume has a certain pressure.
- the control unit 50 may control the throttle 30 to simulate the operation of an injector injection component.
- the controller may control the pump 10 and the throttle 30 or only one of these components such that the operation of a series pump is simulated on the holder 40 so that a nozzle holder combination can be used as the test object. Due to the buffer volume, it is not necessary for the high-pressure pump to build up a high pressure in a very short time in order to simulate a sharp-edged pressure peak on the holder 40. Rather, a valve or throttle 30 with a relatively short reaction time is sufficient to simulate a corresponding pressure curve.
- the high-pressure pump 10 can therefore be designed to lower standards.
- a pressure relief valve is connected to the buffer volume 20, which opens from a certain pressure, wherein the threshold value is preferably electrically adjustable.
- the throttle 30 is designed as a controllable valve. Further, a throttle that determines an adjustable flow rate can be used in combination with a valve whose opening state can be changed quickly, preferably by means of an electrical signal.
- FIG. 2 shows a simplified test device with a high-pressure pump 110, which takes oil from a test oil container (not shown) and under pressure to a DUT mounting unit 140 which is connected to the output of the high-pressure pump 110 supplies.
- the high-pressure pump 110 is connected to a control device which controls the behavior of the high-pressure pump.
- the high-pressure pump is designed to simulate different pressure profiles, for example, those of a series pump and that of an injector pump. To illustrate the corresponding pump properties, the high-pressure pump 110 must be able to be controlled in terms of its pressure curve over time and to have a suitable reaction time.
- the high-pressure pump 110 shown in FIG. 2 can consist of the components 10, 20 and 30 of FIG.
- either the high-pressure CR pump 10 or the throttle 30 or a combination thereof is electrically driven to produce the desired pressure profile.
- FIG. 3 shows an embodiment of the test device according to the invention, in which a high-pressure pump 210 supplies a distributor 270 with pressurized test oil.
- the high pressure pump 210 preferably includes a buffer volume and a controllable throttle (both not shown), wherein the throttle and / or the pump are controlled by a controller 250 connected thereto.
- the embodiment shown in FIG. 3 comprises a plurality of test piece mounting units 240 which are each connected to the controllable distributor 250.
- the specimen mounting units 240 are designed for various injection components to be tested in terms of their dimensions and seals. Therefore, a test fixture unit may couple a particular size and / or injector component type to the controllable manifold 270.
- the controllable distributor 270 is electrically connected to the control unit 250 according to the embodiment shown in FIG.
- the manifold connects, according to the controller 250, only a particular sample holding unit 240 to the high pressure pump 210.
- each sample holding unit comprises a pressure gauge and / or a flow meter.
- an intermediate piece may be provided, which measures the pressure and / or the flow, and which connects the corresponding fürling-holding unit with the DUT.
- a flow meter can be connected to the manifold after the manifold and to the DUT.
- the controller 250 is preferably connected to a database 260 that stores data that maps the pressure history.
- the controller 250 loads the corresponding characteristic and / or the corresponding pressure waveform into the controller to execute pressure control corresponding to the data.
- the controller 250 includes a safety device that receives measurement data from measuring devices or operating data from the high pressure pump, from a controllable restrictor, and / or from the controllable manifold 270, and at critical values or critical value combinations, drives the high pressure pump to stop generating pressure.
- the database can be stored in a part of an electronic memory which stores further parameters, measured value, control values and / or programs for activation, evaluation and user guidance.
- the electronic memory can be provided as a main memory and / or long-term memory for a central processing unit and connected to it.
- FIG. 4 shows a technical implementation of the test device according to the invention.
- This has an electronic display 310 and a user control panel 320.
- a test oil tank 330 is passively cooled by means of cooling fins.
- a mounting device 340 allows the clamping of an injection component to be checked. These are connected to a corresponding supply line 350 to be pressurized with test oil under pressure.
- the holder 340 also has a collecting container and a pressure and volume rate measuring device, which are arranged at the exit of the test specimens.
- control unit is connected to a display and an input, wherein the display represents the values and / or different operating modes to be selected and the input unit permits the selection of specific displays or the selection of particular operating modes.
- database, control, display and selection are implemented as a PC with appropriate input / output devices.
- a mere change of the software or control of software components allows the modification of the test device for different injection components.
- the essence of the invention is to generate the oil pressure by means of a pump device, with the various pressure gradients can be generated.
- common rail high-pressure pumps allow such flexible handling.
- the pump apparatus can be used not only for a common rail type injector of the type to be checked, but also for nozzle holder combinations by changing the driving accordingly.
- a common rail measuring device which measures the pressure, flow rate, injection and recirculation quantities allows corresponding measurements to be taken to obtain data on the characteristics of alien injector components, eg nozzle holder combinations with one or two spring holders, step holders, Unit injector nozzles and injectors with electrical control.
- the controller is already designed for driving injectors, so that a typavier operation of active injection elements can be performed on the test device.
- the test device preferably comprises measuring devices for automatically checking the combination density and the pitting behavior.
- the seat tightness and spray pattern may be evaluated by the operator, with the test apparatus enabling a suitable type-specific operating point of the injection component to be controlled.
- elements for operation and operator guidance and a display are provided immediately adjacent to the specimen mounting unit (40, 140, 240, 340).
- the high-pressure pump includes a buffer volume or if the high-pressure pump is equipped with a buffer volume
- the high-pressure pump can build up a buffer of the pressurized oil, which can be quickly and quickly retrieved without having to quickly change the pressure build-up of the pump.
- the buffer volume is set up to correspond to the volume that corresponds to a common rail injector pump in order to model the pressure profile of a common rail high pressure pump, if a common rail injector is to be checked as an injection component.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007008612A DE102007008612A1 (de) | 2007-02-22 | 2007-02-22 | Testvorrichtung und Verfahren zur Überprüfung von Einspritzkomponenten |
PCT/EP2008/050388 WO2008101751A1 (de) | 2007-02-22 | 2008-01-15 | Testvorrichtung und verfahren zur überprüfung von einspritzkomponenten |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2126336A1 true EP2126336A1 (de) | 2009-12-02 |
EP2126336B1 EP2126336B1 (de) | 2011-09-07 |
Family
ID=39247649
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08701497A Active EP2126336B1 (de) | 2007-02-22 | 2008-01-15 | Testvorrichtung und verfahren zur überprüfung von einspritzkomponenten |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2126336B1 (de) |
CN (1) | CN101631952B (de) |
AT (1) | ATE523688T1 (de) |
DE (1) | DE102007008612A1 (de) |
WO (1) | WO2008101751A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011006942A1 (de) | 2011-04-07 | 2012-10-11 | Zf Friedrichshafen Ag | Druckerzeuger einer Prüf- oder Kalibriervorrichtung |
CN102996313B (zh) * | 2012-12-25 | 2015-06-17 | 天台县唐宋汽车修配厂 | 喷油器拆装检测台 |
CN110513180B (zh) * | 2018-05-21 | 2022-03-15 | 罗伯特·博世有限公司 | 车辆scr系统及其回流流量测定模块和测定方法 |
CN113049253B (zh) * | 2019-12-10 | 2023-08-04 | 中国航发商用航空发动机有限责任公司 | 一种喷嘴模拟装置及燃油系统实验平台 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19801640C1 (de) * | 1998-01-17 | 1999-04-22 | Wtz Motoren & Maschforsch Gmbh | Prüfvorrichtung für Brennstoffeinspritzventile |
DE19851285C5 (de) * | 1998-11-06 | 2007-02-08 | Siemens Ag | Prüfvorrichtung für ein Kraftstoffeinspritzventil |
GB9930120D0 (en) * | 1999-12-21 | 2000-02-09 | Assembly Technology & Test Lim | Monitoring equipment for monitoring the performance of an engine fuel injector valve |
CN1397730A (zh) * | 2001-07-17 | 2003-02-19 | 江美桦 | 喷射供油系统油路测试方法及装置 |
-
2007
- 2007-02-22 DE DE102007008612A patent/DE102007008612A1/de not_active Withdrawn
-
2008
- 2008-01-15 WO PCT/EP2008/050388 patent/WO2008101751A1/de active Application Filing
- 2008-01-15 AT AT08701497T patent/ATE523688T1/de active
- 2008-01-15 CN CN200880005754.9A patent/CN101631952B/zh active Active
- 2008-01-15 EP EP08701497A patent/EP2126336B1/de active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2008101751A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102007008612A1 (de) | 2008-08-28 |
WO2008101751A1 (de) | 2008-08-28 |
ATE523688T1 (de) | 2011-09-15 |
CN101631952B (zh) | 2013-03-27 |
EP2126336B1 (de) | 2011-09-07 |
CN101631952A (zh) | 2010-01-20 |
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