EP0777047A1 - Procédé pour tester le câblage d'injecteurs actionnés par solénoide - Google Patents

Procédé pour tester le câblage d'injecteurs actionnés par solénoide Download PDF

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Publication number
EP0777047A1
EP0777047A1 EP96116826A EP96116826A EP0777047A1 EP 0777047 A1 EP0777047 A1 EP 0777047A1 EP 96116826 A EP96116826 A EP 96116826A EP 96116826 A EP96116826 A EP 96116826A EP 0777047 A1 EP0777047 A1 EP 0777047A1
Authority
EP
European Patent Office
Prior art keywords
magnetic field
injection valve
injection valves
solenoid
wiring
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
EP96116826A
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German (de)
English (en)
Other versions
EP0777047B1 (fr
Inventor
Jürgen Dr.-Ing. Seekircher
Martin Dr.-Ing. Bair
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.)
Mercedes Benz Group AG
Original Assignee
Daimler Benz AG
Mercedes Benz AG
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 Daimler Benz AG, Mercedes Benz AG filed Critical Daimler Benz AG
Publication of EP0777047A1 publication Critical patent/EP0777047A1/fr
Application granted granted Critical
Publication of EP0777047B1 publication Critical patent/EP0777047B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 invention relates to a method and a device for checking the wiring of solenoid-operated injection valves of an internal combustion engine.
  • electrically controllable injection valves contain a solenoid coil, which generates a magnetic field when current is applied, which an associated valve actuating element against e.g. closing force applied by a spring is moved into its open position.
  • the injectors After mounting on the engine block, the injectors are electrically connected to an engine control unit via appropriate plug connections and cabling.
  • the injection valves of the internal combustion engine are checked pneumatically during a test bench test via a pressure drop when actuated or via an electrical resistance measurement.
  • Various methods for contactless checking of the function of the injection valves have therefore already been proposed.
  • a measuring system of ultrasonic transducers is provided, each of which is assigned to a cylinder of the engine and is attached to the relevant cylinder head in a sound-conducting manner.
  • the ultrasonic transducers detect the sound emitted by the fuel injection process, especially by the movement of the valve nozzle needle or by the injected fuel.
  • the proper functioning of the fuel injection system is checked by evaluating the detected sound signals.
  • the pulse rates are analyzed as a function of the crank angle in a monitoring area that covers the crank angle range from the crank angle interval of the safely detected static delivery start of the fuel injection pump to the crank angle interval , in which fuel can still be injected at maximum cylinder filling.
  • the cut-off voltage induced by the solenoid of a respective solenoid-operated injection valve is detected when the current through the solenoid is switched off and compared with a reference value. If the induced cut-off voltage does not exceed the reference value, an information signal is generated which indicates an incorrect state of the injection valve.
  • the invention is based on the technical problem of providing a method and a device of the type mentioned at the outset, with which it can be checked contactlessly and with comparatively little effort whether each of the injection valves is wired in a functional manner with the connection of the associated control provided for it connected is.
  • the current flowing through a respective injection valve solenoid coil during a checking process need only be so large that a detectable magnetic stray field is generated. In particular, it need not be so large that the injection valve opens, but can be kept so small that the valves remain closed.
  • this then has the advantage that the preservation is retained during the wiring check and the preserving liquid is not as with a pneumatic one Injector test is blown out into the engine.
  • the method according to the invention also saves setup time and time, since no compressed air connection to the fuel rail to which the injection valves are mounted has to be provided and the filling and calming times required for the pneumatic valve test are eliminated.
  • the method and the device according to the invention are particularly suitable for use within an engine test bench device.
  • the single figure shows a schematic block diagram of parts of an engine test bench device essential to the invention while checking the wiring of solenoid-operated injection valves of an internal combustion engine.
  • the figure illustrates a process for checking the injector wiring as part of a cold test of an internal combustion engine (1) carried out with a suitably equipped test bench device, only the components relevant to the invention being shown for the sake of clarity.
  • the injection valves of the engine (1) to be checked during the cold test two of which (2a, 2b) are explicitly shown, are shown with a not shown
  • Fuel rail is mounted on the engine block and are of a conventional, electrically controlled, electromagnetically actuated type, in which the valve actuating element is pressed into the closed position by a spring and a magnetic coil is provided, the magnetic field generated when current is applied to it moves the valve closing member into its open position.
  • each solenoid coil and thus each of the solenoid-operated injection valves (2a, 2b) is assigned a control line (4a, 4b), which, after the injection valves (2a, 2b) are installed on the engine (1) via plug connections (3a, 3b) each intended injection valve (2a, 2b) are inserted.
  • the control lines (4a, 4b) are connected at this valve-side end section from a cable harness (4) which combines these control lines (4a, 4b) and other lines that are not of further interest here.
  • the injection valve control lines (4a, 4b) lead at their end facing away from the valve to a connection unit (5) which in each case contains a connection (5a, 5b) for each control line (4a, 4b).
  • connection unit (5) In normal engine operation, an engine control unit (not shown) belonging to the engine (1) is connected to this connection unit (5), which generates the control signals for the injection valves (2a, 2b) and outputs them to the associated control lines (4a, 4b).
  • this connection unit (5) forms the electrical point of intervention for checking the wiring of the injection valves (2a, 2b), ie the correct electrical conductivity of the connection unit (5) and the injection valve control lines (4a, 4b) and the correct assignment of the control lines (4a, 4b) to the individual injection valves (2a, 2b) via the plug connections (3a, 3b).
  • the test stand device has a linkage (7) which is arranged to be three-dimensionally movable on a fixed frame, as symbolized by the arrow cross (8).
  • a linkage (7) On the linkage there are a number corresponding to the number of injection valves (2a, 2b) Magnetic field sensors (6a, 6b) are mounted, the magnetic field sensors (6a, 6b) being arranged on the engine (1) in accordance with the position of the injection valves (2a, 2b).
  • all magnetic field sensors (6a, 6b) can, as shown, be brought simultaneously in the immediate vicinity of an associated injection valve (2a, 2b).
  • Typical approach distances are, for example, between 6 cm and 10 cm.
  • the magnetic field sensors (6a, 6b) are thus within the respective magnetic stray field environment of the injection valves (2a, 2b), ie within the space in which the magnetic coils of the injection valves (2a, 2b) can be measured by the magnetic field sensors (6a, 6b) Generate already with coil currents that are smaller than the solenoid current required to open the valve (2a, 2b). This enables the injector wiring to be checked without having to operate the injectors (2a, 2b) in the opening direction.
  • the cabling test process is controlled and evaluated by a test control unit (9).
  • the control unit (9) generates valve-controlling AC voltage signals of different frequencies, each of which is passed to a separate, valve-specific output control line (10a, 10b), to a connection unit (11) with separate connections (11a, 11b) assigned to the control unit (9). are led.
  • This connection unit (11) is connected to the input-side connection unit (5) of the injection valve control lines (4a, 4b) instead of a later engine control unit-side connection unit, as shown in the figure.
  • the checking control unit (9) is able to apply an alternating voltage of a characteristic frequency to the individual connections (5a, 5b) of the connection unit (5) of the injection valve control lines (4a, 4b), which, when properly wired, causes a corresponding current to be applied to the Solenoid coil of the intended injection valve (2a, 2b) and consequently a specific magnetic stray field in the vicinity of the intended injection valve (2a, 2b).
  • the magnetic stray fields generated are recorded individually for each injection valve (2a, 2b) by the respectively assigned magnetic field sensor (6a, 6b).
  • the output signal of each magnetic field sensor (6a, 6b) is fed to the evaluating checking control unit (9) via corresponding signal lines (12a, 12b).
  • the checking control unit (9) determines for each injection valve (2a, 2b) whether its cabling, ie the electrical line path from the relevant input connection ( 5a, 5b) via the cable harness (4) and the bound end section of the control lines (4a, 4b) to the solenoid of the injection valve (2a, 2b) is in order. This includes in particular the determination of whether an injection valve (2a, 2b) is connected to the respective plug connection (3a, 3b) and whether the plug connections (3a, 3b) to the various injection valves (2a, 2b) have been connected correctly or incorrectly .
  • the checking process described can be carried out simultaneously for all injection valves (2a, 2b), which saves test time.
  • it can be provided to check the wiring for the individual injection valves (2a, 2b) sequentially by the checking control unit (9) sending a direct voltage signal to the various injection valves (2a, 2b) in succession.
  • the test voltages generated by the checking control unit (9) are preferably selected to be so small that the magnetic field generated by the magnetic coils of the injection valves (2a, 2b) so energized is not sufficient to move the associated valve actuating element into its open position, so that the injection valves (2a, 2b) during the Cabling check remain closed.
  • a preservation liquid which may be contained in the injection valves (2a, 2b), as is often provided in the new state, thereby remains in the injection valves (2a, 2b) during the test process. The preservation of the injection valves (2a, 2b) can be maintained in this way for a longer storage or a longer transport of the engine (1).
  • test procedure described consequently enables a reliable and comfortable, contactless check of the wiring of the solenoid-operated injection valves (2a, 2b) of the internal combustion engine (1) with a short test time, in particular also the correct connection of the injection valves (2a, 2b) to the control lines specifically intended for them (4a, 4b) can be checked.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Testing Of Engines (AREA)
EP96116826A 1995-12-01 1996-10-19 Procédé pour tester le câblage d'injecteurs actionnés par solénoide Expired - Lifetime EP0777047B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19544845 1995-12-01
DE19544845A DE19544845C1 (de) 1995-12-01 1995-12-01 Verfahren und Vorrichtung zur Überprüfung der Verkabelung magnetspulenbetätigter Einspritzventile

Publications (2)

Publication Number Publication Date
EP0777047A1 true EP0777047A1 (fr) 1997-06-04
EP0777047B1 EP0777047B1 (fr) 1999-09-15

Family

ID=7778933

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96116826A Expired - Lifetime EP0777047B1 (fr) 1995-12-01 1996-10-19 Procédé pour tester le câblage d'injecteurs actionnés par solénoide

Country Status (5)

Country Link
US (1) US5811671A (fr)
EP (1) EP0777047B1 (fr)
JP (1) JP2767237B2 (fr)
DE (1) DE19544845C1 (fr)
ES (1) ES2138281T3 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10316634A1 (de) * 2003-04-11 2004-10-28 Robert Bosch Gmbh Verfahren und Vorrichtung zur Prüfung eines Kraftstoffzumesssystems
US20040246649A1 (en) * 2003-06-03 2004-12-09 Mks Instruments, Inc. Flow control valve with magnetic field sensor
ITBI20080017A1 (it) * 2008-09-11 2010-03-12 Derossi Massimo Srl Mm 100 strumento diagnostico multiuso per motori benzina/diesel/gpl/metano
DE102009027598A1 (de) * 2009-07-09 2011-01-13 Ge Sensing & Inspection Technologies Gmbh Verbesserte zerstörungsfreie Untersuchung von Hochdruckleitungen
RU2477384C1 (ru) * 2012-03-14 2013-03-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Челябинская государственная агроинженерная академия" Способ диагностирования электробензонасосов системы топливоподачи автомобиля
JP6406126B2 (ja) * 2015-05-26 2018-10-17 株式会社デンソー 燃料噴射制御装置
US10920729B2 (en) * 2017-02-08 2021-02-16 Pratt & Whitney Canada Corp. Method and system for testing operation of solenoid valves
US11307115B2 (en) 2019-03-10 2022-04-19 Automatic Switch Company Valve test connection
KR200496335Y1 (ko) * 2020-08-27 2023-01-06 주식회사 한국가스기술공사 솔레노이드 코일 동작 점검장치

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61129460A (ja) 1984-11-28 1986-06-17 Sumitomo Electric Ind Ltd インジエクタ監視装置
JPS63248969A (ja) 1987-04-06 1988-10-17 Nippon Denso Co Ltd 燃料噴射装置の故障診断装置
DD272682A1 (de) 1988-05-18 1989-10-18 Seefahrt Inghochschule Automatische ueberwachung des brennstoffeinspritzvorganges bei dieselmotoren
JPH0746163A (ja) * 1993-07-30 1995-02-14 Furukawa Electric Co Ltd:The 漏洩磁界検知システム

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DE272682C (fr) *
US4441360A (en) * 1982-03-12 1984-04-10 Creative Tool Company Engine timing instrument
DE3242317A1 (de) * 1982-11-16 1984-05-17 Robert Bosch Gmbh, 7000 Stuttgart Messeinrichtung an einer brennkraftmaschine zur staendigen erfassung von betriebsparametern
US4517833A (en) * 1983-03-18 1985-05-21 Wesley William M Inductive adaptor/generator for diesel engines
US4687994A (en) * 1984-07-23 1987-08-18 George D. Wolff Position sensor for a fuel injection element in an internal combustion engine
DE3918534A1 (de) * 1989-06-07 1990-12-20 Braun Melsungen Ag Drucksensor fuer infusionsleitungen
US5133323A (en) * 1991-06-25 1992-07-28 Siemens Automotive L.P. Intake manifold pressure compensation for the closed-loop pressure regulation of a fuel pump
US5241858A (en) * 1991-12-09 1993-09-07 Siemens Automotive L.P. Dynamic flow calibration of a fuel injector by selective diversion of magnetic flux from the working gap

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61129460A (ja) 1984-11-28 1986-06-17 Sumitomo Electric Ind Ltd インジエクタ監視装置
JPS63248969A (ja) 1987-04-06 1988-10-17 Nippon Denso Co Ltd 燃料噴射装置の故障診断装置
DD272682A1 (de) 1988-05-18 1989-10-18 Seefahrt Inghochschule Automatische ueberwachung des brennstoffeinspritzvorganges bei dieselmotoren
JPH0746163A (ja) * 1993-07-30 1995-02-14 Furukawa Electric Co Ltd:The 漏洩磁界検知システム

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 013, no. 041 (M - 791) 30 January 1989 (1989-01-30) *
PATENT ABSTRACTS OF JAPAN vol. 95, no. 002 *

Also Published As

Publication number Publication date
JP2767237B2 (ja) 1998-06-18
US5811671A (en) 1998-09-22
JPH09184467A (ja) 1997-07-15
ES2138281T3 (es) 2000-01-01
EP0777047B1 (fr) 1999-09-15
DE19544845C1 (de) 1997-05-28

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