WO2012007228A1 - Banc d'essai pour pompes à fluide et injecteurs de fluide - Google Patents

Banc d'essai pour pompes à fluide et injecteurs de fluide Download PDF

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Publication number
WO2012007228A1
WO2012007228A1 PCT/EP2011/059268 EP2011059268W WO2012007228A1 WO 2012007228 A1 WO2012007228 A1 WO 2012007228A1 EP 2011059268 W EP2011059268 W EP 2011059268W WO 2012007228 A1 WO2012007228 A1 WO 2012007228A1
Authority
WO
WIPO (PCT)
Prior art keywords
synchronous motor
fluid
test stand
control circuit
safety
Prior art date
Application number
PCT/EP2011/059268
Other languages
German (de)
English (en)
Inventor
Dirk Schoenfeld
Karl Kastner
Kurt Blank
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 WO2012007228A1 publication Critical patent/WO2012007228A1/fr

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
    • 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 invention relates to a test stand for testing a fluid pump and a fluid injector.
  • State of the art :
  • Test benches for testing fluid pumps, in particular high-pressure fuel pumps, and fluid injectors, in particular fuel injectors for internal combustion engines, are known in the prior art.
  • the fluid pump is usually driven by a three-phase asynchronous motor having a flywheel with high inertia to ensure a constant speed.
  • the large inertia of the flywheel has the consequence that the time from switching off the engine to its standstill from a speed of 3000 rev / min is several seconds.
  • This large deceleration time requires increased safety devices to protect a test bench operator from the high speed rotating parts and the test oil exiting the fluid injector at high pressure operation of the high pressure fluid pump.
  • test benches therefore have a first protection device, which is designed, for example, as a door, hood or roller shutter, which is connected to a safety contact in such a way that the motor is turned off when the first protection device is opened.
  • a first protection device which is designed, for example, as a door, hood or roller shutter, which is connected to a safety contact in such a way that the motor is turned off when the first protection device is opened.
  • a second protection device is provided, which the rotating parts covers and to remove them first a mechanical
  • the second protection device is designed so that the release of the mechanical lock and the removal the second protection device is only possible after the engine has come to a standstill.
  • test stand according to the invention according to independent claim 1 and an inventive method for testing a fluid pump and / or a fluid injector according to independent claim 8.
  • the dependent claims describe advantageous embodiments of a test stand according to the invention or a test stand according to the invention
  • An inventive test stand for a fluid pump and a fluid injector has a synchronous motor, which is mechanically connectable to the fluid pump to be tested and designed to drive the fluid pump. Furthermore, an inventive test stand on a control circuit which is adapted to drive the synchronous motor so that it rotates at a constant speed.
  • the fluid pump is, for example, via a mechanical pump
  • a synchronous motor as used in a test stand and a method according to the invention can be controlled by a suitable control circuit such that it rotates at a very constant speed, without it being necessary to provide a rotating flywheel with high inertia.
  • the synchronous motor can therefore particularly fast and energy-saving accelerated to the desired test speed and from the
  • the test speed can be braked to a standstill.
  • the fast braking capability of the synchronous motor makes it possible to quickly bring the motor and thus the fluid pump to a halt when needed, so that no additional safety device is required, which obstructs access to the fluid injector and / or fluid pump until the motor and the fluid pump for Standstill have come.
  • the operability of a test stand according to the invention is thereby improved.
  • the fluid pump and / or the fluid injector can be accessed faster than in the case of a conventional test bench, without impairing the safety of the operator.
  • the motor is designed as a three-phase synchronous motor.
  • a three-phase synchronous motor is particularly effectively controlled so that it rotates at a constant speed and has a high torque.
  • control circuit has a control circuit which is designed such that it controls the synchronous motor so that it rotates at a constant speed.
  • a constant speed of the motor driving the fluid pump is required in order to obtain representative and repeatable measurement results when testing the fluid pump and / or the fluid injector.
  • the synchronous motor can be controlled particularly reliably in such a way that it rotates at a constant speed and reliably reproducible measurement results can be generated.
  • the synchronous motor and the control circuit are designed such that the synchronous motor with a speed gradient of more than 3000 U / min per second can be accelerated and braked.
  • the engine can be accelerated and decelerated particularly fast.
  • the fast braking capability ensures a high level of safety for the operator of the test stand.
  • the test stand has a safety switch connected to the control circuit such that the synchronous motor can be stopped by operating the safety switch.
  • a safety switch By such a safety switch, the safety for an operator of the test stand is further increased.
  • the safety switch is connected to a safety cover in such a way that it is automatically actuated when the safety cover is opened.
  • a trained test bench has a particularly high level of safety, since the engine and with it the fluid pump are automatically switched off when the safety cover is opened.
  • Test bench is improved in this way; In particular, the fluid pump and the fluid injector can be replaced easier and faster.
  • the synchronous motor and the control circuit are designed such that the synchronous motor comes to a standstill within less than 1.5 seconds after the actuation of the safety switch. This further increases the safety of the test bench.
  • the test stand can be designed so that the operator is not able to touch rotating parts within 1, 5 seconds after opening the safety cover or otherwise to get into a danger area of the test bench with a body part.
  • the synchronous motor is provided with a rotating flywheel in operation, which is preferably less than 20% of the flywheel in a conventional test stand;
  • the flywheel has an inertia of less than 0.2 kgm 2 .
  • FIG. 1 shows a schematic representation of a test stand 2 according to the invention.
  • An inventive test stand 2 has a housing with an engine compartment 24 and a pump chamber 26, which are separated by a partition 38 from each other.
  • a possibly to be tested fluid pump 12 is arranged, which takes 9 fluid (test oil) from a tank container 10 during operation by a suction line.
  • An output of the fluid pump 12 is connected via a first fluid pressure line 14 to a pressure accumulator (Prüfrail) 40.
  • the pressure in the pressure accumulator 40 can be measured by at least one pressure sensor 42 arranged in the pressure accumulator 40 and can be set to the desired value with high accuracy by actuating a pressure setting valve 44, by means of which excess fluid can be returned from the pressure accumulator 40 into the tank container 10 ,
  • the pressure accumulator 40 is hydraulically connected to a fluid injector 4 to be tested via a second fluid pressure line 15 in order to supply fluid under pressure to the fluid injector 4 during operation.
  • the fluid emitted by the fluid injector 4 during operation is collected by a collecting device 6 and returned to the tank container 10 via a return line 8, in which a fluid measuring unit 50, which is designed to measure the amount of fluid, is arranged.
  • the fluid measuring unit 50 is connected to an evaluation and display unit 52 which is designed to evaluate and display the fluid quantities measured by the fluid measuring unit 50.
  • the measured values can be transmitted by wire or wireless to an evaluation and display unit arranged outside the pump chamber 26.
  • the pressure accumulator 40 is additionally hydraulically connected to the fluid measuring unit 50 via a bypass line 48, which can be closed by a bypass valve 46.
  • a bypass valve 46 For checking the fluid injector 4, the bypass valve 46 is closed. To test the fluid pump 12, the bypass valve 46 is opened and the Fluid injector 4 is not actuated, so that the fluid measuring unit 50 measures the amount of fluid delivered by the fluid pump 12.
  • the test stand 2 may be formed with receiving devices not shown in the figure for receiving the fluid pump or the fluid injector 4, which the
  • Fluid pump 12 and the fluid injector 4 record reliably in test mode and hydraulically connect to the fluid lines while allowing a simple and quick replacement of the fluid pump 12 and the fluid injector 4. This makes it possible to test a large number of fluid pumps 12 and / or fluid injectors 4 in the shortest possible time.
  • the fluid pump 12 is connected to a motor 18 via a shaft 16, which extends from the pump chamber 26 into the engine compartment 24 through a passage 40 formed in the partition wall 38.
  • the shaft 16 may be provided with a coupling, not shown in the figure, to allow a simple, safe and quick coupling and uncoupling of the pump 12 and to facilitate the replacement of the fluid pump 12.
  • the shaft 16 is connected to a
  • Flywheel 17 is formed, which increases the moment of inertia of the shaft 16 and increases the constancy of the rotational speed of the motor 12, the shaft 16 and the fluid pump 12.
  • the moment of inertia of the flywheel 17 is clearly none other than the moment of inertia of a flywheel, as used in a conventional test stand in which the fluid pump is driven by an induction motor.
  • the flywheel 17 has an inertia torque that is less than 20% of the moment of inertia of a conventional flywheel.
  • the flywheel usually has an inertia of more than 0.5 kgm 2 , typically 0.78 kgm 2 .
  • the flywheel 17 of a test stand has, for example, an inertia of 0.12 kgm 2 .
  • the motor 18 in the engine compartment 24 is formed as a three-phase synchronous motor 18 and connected via three power lines 22 to a control circuit 20, which is designed such that it drives the three-phase synchronous motor 18 in operation such that it rotates at a constant speed.
  • the desired speed is adjustable on the control device 20.
  • the pump chamber 26 has at least one (shown in the figure on the right) side on a hinge 30 pivotally mounted flap.
  • the flap is by a handle 32 which is fixed to the flap 28, hinged to allow an operator access to the pump chamber 26 and in particular to the fluid pump 12 and the fluid injector 4, z. B. to exchange these.
  • a safety switch 34 is arranged such that it is actuated when opening and closing the safety flap 28.
  • the safety switch 34 is designed such that it can be seen from its switching state whether the safety flap 28 is completely closed or not.
  • the safety switch 34 is connected to the control circuit 20 via an electrical safety line 36.
  • control circuit 20 also detects when the safety flap 28 is opened during operation of the motor 18 and the switching state of the safety switch 34 is changed. In this case, the control circuit 20 controls the motor 18 so that it is very fast, d. H. with a very high speed gradient, is stopped to ensure the safety of the operator of the test bench 2.
  • the shaft rotates at a maximum speed of 4000 rpm. If the motor 18 has e.g. a speed gradient of 3000 U / min per second, it is completely stopped within 1.33 seconds after the actuation of the safety switch 34 to a standstill. This time is usually sufficient to ensure the safety of the operator of the test bench.
  • the safety flap 28 and the pump chamber 26 can be designed such that it is impossible for an operator to reach a danger zone of the test stand 2 with a body part within this time after the safety switch 34 has been actuated.
  • additional safety switches 34 may additionally be provided, with the motor 18 being stopped when at least one of the safety switches 34 is actuated. This can be the safety be ensured even with a malfunction of the safety switch 34.
  • the safety switch (s) 34 can also be designed as mechanical safety switches 34 but also as light barriers, light curtains, inductive proximity sensors or similar devices which indicate an opening of the safety flap 28 and / or an approach of a body part of an operator to a danger area of the test bed 2. Since it is possible to dispense with a second safety cover in a test stand 2 according to the invention, a test stand 2 according to the invention enables fast and convenient access of an operator to the fluid pump 12 to be tested and / or the fluid injector 4 to be tested, without impairing the safety of the operator ,

Abstract

L'invention concerne un banc d'essai (2) destiné à une pompe à fluide (2) et à un injecteur de fluide (4), en particulier à une pompe à carburant et à un injecteur de carburant, comprenant un moteur synchrone (18) pouvant être raccordé mécaniquement à une pompe à fluide à tester (12) et destiné à entraîner cette dernière, ainsi qu'un circuit de commande (20) conçu pour commander le moteur synchrone (18).
PCT/EP2011/059268 2010-07-16 2011-06-06 Banc d'essai pour pompes à fluide et injecteurs de fluide WO2012007228A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010031480 DE102010031480A1 (de) 2010-07-16 2010-07-16 Prüfstand für Fluidpumpen und Fluidinjektoren
DE102010031480.3 2010-07-16

Publications (1)

Publication Number Publication Date
WO2012007228A1 true WO2012007228A1 (fr) 2012-01-19

Family

ID=44276307

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/059268 WO2012007228A1 (fr) 2010-07-16 2011-06-06 Banc d'essai pour pompes à fluide et injecteurs de fluide

Country Status (2)

Country Link
DE (1) DE102010031480A1 (fr)
WO (1) WO2012007228A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022202684A1 (de) * 2022-03-18 2023-09-21 Robert Bosch Gesellschaft mit beschränkter Haftung Kompakter Hochdruckspeicher

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE912034C (de) * 1947-02-20 1954-05-24 Leslie Hartridge Pruefstand fuer die Einspritzduese von Dieselmaschinen
GB844307A (en) * 1956-02-28 1960-08-10 Prec Mecanique Improvements in or relating to test benches for fuel injection and like pumps
US6234002B1 (en) * 1997-09-05 2001-05-22 David W. Sisney Apparatus and methods for cleaning and testing fuel injectors

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE912034C (de) * 1947-02-20 1954-05-24 Leslie Hartridge Pruefstand fuer die Einspritzduese von Dieselmaschinen
GB844307A (en) * 1956-02-28 1960-08-10 Prec Mecanique Improvements in or relating to test benches for fuel injection and like pumps
US6234002B1 (en) * 1997-09-05 2001-05-22 David W. Sisney Apparatus and methods for cleaning and testing fuel injectors

Also Published As

Publication number Publication date
DE102010031480A1 (de) 2012-01-19

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