EP2764233A1 - Systeme de maintenance d'un injecteur - Google Patents
Systeme de maintenance d'un injecteurInfo
- Publication number
- EP2764233A1 EP2764233A1 EP12768848.9A EP12768848A EP2764233A1 EP 2764233 A1 EP2764233 A1 EP 2764233A1 EP 12768848 A EP12768848 A EP 12768848A EP 2764233 A1 EP2764233 A1 EP 2764233A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injector
- cycle
- solenoid
- control unit
- maintenance
- 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
- F02M65/007—Cleaning
- F02M65/008—Cleaning of injectors only
-
- 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 system for the maintenance and servicing of fuel injectors driven by solenoid and equipping internal combustion engines.
- the invention more particularly relates to a portable system for interventions without disassembly of the injector and a maintenance kit comprising such a system.
- solenoid-driven injectors fitted to internal combustion engines is a common operation in garages and other vehicle maintenance areas. This operation can be regular or occasional because a dysfunction is suspected or proven and that a diagnosis is necessary prior to a possible repair.
- the maintenance operation requires the control of the electrical characteristics of the solenoid such as the measurement of the resistance, that of the value of the insulation and that of the inductance.
- a pilot test also called actuator test or "buzz test” in English, is sometimes possible. During this test the injector is activated and then emits an audible buzz.
- a maintenance operator performs electrical measurements using a standard multimeter by varying the measurement points according to the observed characteristic.
- Some solenoids have low resistances and the standard multimeter is not precise enough to give a fair value, special multimeters must be used. The same goes for measuring the inductance.
- the actuator test can be performed only if the electronic control unit of the injector is provided with such a function, then implemented via a specific tool. Few control units are equipped with this function.
- the actuator test itself also has certain limitations. When the operator initiates the actuator test and no buzzing is audible it does not necessarily imply a solenoid fault. The operator has yet to identify which element of the command is in default. It usually begins with the isolation and electrical continuity of the beam and then continues with the electrical measurements of the solenoid itself and, if no fault could be detected the operator replaces the injector with a new injector. Finally, if nothing is detected during these steps, the operator replaces the control unit after the usual checks: condition of the fuses, masses correctly connected, net electrical contacts ... The verification of the electrical continuity of the Beam is, in itself, an operation that can be long depending on whether the electrical architecture of the vehicle is simple or more complex and this verification may require the use of a specific junction box.
- the operator can not directly conclude the correct operation of the injector.
- the injector can nevertheless be operated and controlled by an electric current just sufficiently high but still not sufficient to allow precise control of the injection.
- the identification of the defect involves weak resistance measurements, less than 1 ⁇ , and very difficult to measure with a standard multimeter such as those commonly used in maintenance workshops and able to measure a much higher electrical resistance, a DC voltage. or alternative and an electric current.
- the present invention solves the aforementioned problems by providing a maintenance system for a fuel injector driven by a solenoid actuator and intended to equip an internal combustion engine.
- the system comprises an electronic control unit arranged in a housing of which extends an electric cable terminated by a specific adapter adapted to be connected to the injector so that the injector is electrically connected with the electronic control unit while it remains advantageously in place on the internal combustion engine.
- the electronic control unit is designed to perform a number of operations which are automatically linked in a determined cycle including the verification of the electrical insulation, the measurement of the electrical resistance and the inductance of the solenoid and an activation test. solenoid also called actuator test or "buzz test" in English.
- the electronic control unit automatically adjusts and optimizes the characteristics of the solenoid activation test according to the measurements previously made during the cycle.
- control unit is designed to carry out a cleaning cycle comprising a cleaning step in the course of which a cleaning fluid circulates in the injector.
- the system is provided with a selector for choosing between the measurement cycle and the cleaning cycle, and an actuator for starting the selected cycle.
- selector and actuator can be combined into a single button for selecting the cycle to be performed, for example by a long press on said button, then the management of the selected cycle of the cycle by short presses.
- a display screen, or any other means to inform about the cycle in progress. Based on this information the operator can manage the selected cycle. This information can be transmitted in the form of messages written on the screen, or audible messages such as "beep-beep", or the light messages according to lighting lights of the LED type of colors.
- the system is advantageously movable and portable with one hand, easily manipulated and usable so as to be taken by an operator to a vehicle whose injector must be checked.
- the specific adapter can be connected to the end of the electrical cable and can be disconnected and replaced by another adapter specific to another injector so that a same control unit can advantageously be used for the maintenance of a plurality of models. injectors.
- the invention also relates to a maintenance kit of fuel injectors controlled by a solenoid actuator and intended to equip internal combustion engines.
- the kit includes a maintenance system as previously described and at least one additional specific adapter so that the control unit can be used with at least two different injector models.
- the kit may also comprise a pressure vessel, for example an aerosol, containing cleaning fluid, for example a solvent, as well as specific connections so that the vessel can be connected to the high pressure inlet of the injector to be cleaned up.
- the invention finally relates to a fuel injector maintenance method controlled by a solenoid actuator equipping a motor
- the method begins with the connection of a maintenance system and then includes the steps of verification of insulation, measurement of the electrical resistance and inductance of the solenoid and then performing a solenoid activation test. The steps are linked in a determined cycle, the injector remaining in place on the internal combustion engine and the
- the cycle executed is either the cycle of the measurements presented above or a cleaning cycle further comprising a cleaning step of the injector during which a cleaning fluid circulates in the injector.
- Figure 1 is a view showing a system for maintenance of an injector in use by an operator.
- Figure 2 is a more detailed view of the system of Figure 1.
- Figure 3 is a diagram of the steps of a measurement cycle performed by the system of Figures 1 and 2.
- Figure 4 is a diagram of the steps of a cleaning cycle performed by the system of Figures 1 and 2.
- Figure 5 is a maintenance kit comprising a system as shown in Figures 1 and 2 as well as several specific adapters.
- Figure 1 shows schematically an operator leading a system of maintenance operations on a fuel injector 10 of a car internal combustion engine.
- the system 20 comprises a portable housing 22, held in the hand by the operator, the injector 10 being in place on the engine.
- FIG. 2 shows the fuel injector 10 driven by a solenoid 12 being serviced.
- the maintenance system 20 is in place. It comprises the housing 22 containing an electronic control unit 24 and provided with a display screen 26 electrically connected to the control unit 24, information relating to the actions controlled by the control unit 24 being displayed there of the operator.
- the housing 22 is provided with a single control knob acting as selector 30. When the operator exerts a long pressure, the selector 30 allows to choose from proposed operations.
- the control button also acts as an actuator button 32 for starting the selected operation when the operator exerts pressure on it for a short time. Multiple other case designs exist and are within the reach of those skilled in the art, such as a housing where the selector 30 and the actuator button 32 are separated, or else housings where the information is relayed to the operator via diode-type indicators
- electroluminescent colors or a housing where the selector and the button are directly accessible digital controls by touching a sensitive screen.
- the housing 22 is electrically powered by an external battery 34 to which it is connected by a conventional power cord 36.
- the power supply required to perform the tests described below imposes a substantial battery that can be the vehicle battery or an external power supply.
- the control unit 24 is electrically connected to the injector 10 undergoing maintenance by a cable consisting of a first section 38 and a specific adapter 40.
- the first section 38 extends from the control unit 24. to the outside of the housing 22 by passing the wall of the housing 22 via an orifice and a gland. At the free end of this first section 40 is arranged a connector 44.
- the specific adapter 40 is a cable at the ends of which are arranged on the one hand a connector 46 provided to connect to the connector 44 of the first section 38 according to a conventional complementary engagement of the male-female type and, secondly, a specific connector 48 provided to connect to the injector 10.
- the cable thus formed of the first section 38 and the adapter 40 must be long enough to allow an operator to comfortably perform, such as for example in Figure 1, the maintenance operations without having to disassemble the injector 10 of the engine.
- a total length of the cable between one and two meters must be sufficient but other lengths are possible, the majority of the length being in the first section 38, the adapter 40 being shorter for example between ten and thirty centimeters.
- an isolation control cable 50 of length substantially equal to that of the cable 38, 40 extends from the control unit 24 and ends with a hooking means 52 of the crocodile clip type.
- the isolation control cable 50 may be independent of the section 38 or may form with the section 38 a single beam, the section 38 and the insulation control cable 50 being distinguished only at the approach of their ends so that they can be placed in separate places.
- the maintenance system 20 is set up for the maintenance operations of the injector 10.
- the electronic control unit 24 is multifunctional and makes it possible to carry out the measurements and tests necessary for the maintenance of the injector 10.
- control unit 24 is provided with a signal generator for activating the solenoid 12 and for operating the injector 10.
- the control unit 24 is provided with the known means of memorizing and executing a computer program.
- FIG. 3 is a first flow diagram that details the steps of a measurement cycle 60 stored and executable by the control unit 24.
- the measurement cycle 60 provides a measurement of the insulation and electrical continuity 62 of the solenoid 12 and a measurement of electrical resistance 64 and a measurement of the inductance 66 and finally a 68 activation test, also known as actuator test or "buzz test" in English.
- the isolation test 62 measures the electrical resistance between a pin of the solenoid 12 in electrical contact in the specific connector 48 and the crocodile clip 52 placed so as to be electrically equipotential of the injector holder body.
- the crocodile clip 52 is directly attached to the injector holder but other locations can be chosen.
- the nominal range of the measurement is 1 ⁇ to 10 MegaQ, a low resistance being characteristic of an insulation fault and a high resistance indicating a correct insulation.
- the measurement of the electrical resistance 64 of the solenoid 12 is carried out according to the Kelvin four-wire method, known to those skilled in the art.
- the electrical connections are made via the specific connector 48 identical to that normally in place on the injector 10 and not by means of other crocodile clips that affect the measurements.
- the nominal range is 10 m ⁇ to 10 ⁇ with an accuracy of 2% and a resolution of lmQ for resistance included between 10 m ⁇ and 250 ⁇ , of ⁇ for a resistance of between 250 m ⁇ and 1 ⁇ and finally 100 m ⁇ for a resistance greater than 1 ⁇ .
- the inductance measurement 66 is performed by means of the RLC measuring bridge. It is important to carry out a measurement of the capacitance of the injector 10 beforehand. Indeed, the capacitance is not negligible and the measurement of the inductance 66 could be distorted by a bad taking into account of the capacitance.
- the RLC measuring bridge of the control unit 24 is specifically provided to perform both capacitance and inductance measurements.
- the nominal inductance range is 10 ⁇ to 10mH with an accuracy of 2% and a resolution of 0.1 ⁇ for an inductance of between 10 ⁇ and
- the activation of the injector 10 is controlled by the signal generator consisting mainly of a MOSFET transistor.
- the power supply comes from the battery 34 of the vehicle or an external power supply.
- the purpose of this test is to operate the injection valve of the injector 10 without exercising any injection control.
- the signal generator emits a simple signal without control of the electric current, a square signal for example. Another possibility is to control the driving current which results in a pulse train which causes the valve to move.
- the signal is chosen so that during its alternating activation, the valve produces an audible buzz.
- the frequency of the control signal must be chosen as a function of the resistance of the solenoid 12 and according to values increasing from 500 Hz for a solenoid electrical resistance of ⁇ up to 850 Hz for a resistance of 10 ⁇ .
- the high time of the square signal depends both on the resistance and on the inductance of the solenoid 12. Thus for a resistance of 300 mA and an inductance of ⁇ ⁇ , the high time of the square signal must last 250 ⁇ m while for a resistance of 10 ⁇ and an inductance of 10mH this duration should be 2200 ⁇ .
- the characteristics of the control signal of the actuator test 68 are automatically adjusted and optimized by the electronic control unit 24 on the basis of the measurements 62, 64, 66, previously made during the course of the cycle in progress.
- the frequency values indicated are nonlimiting, other frequency values can be chosen. In addition, it is possible to vary the frequency of the activation signal during the course of the test.
- the system 20 designed to be an injector maintenance tool may also be useful on some new injectors. Indeed, it happens that new injectors are stored and remain stored relatively long, this is for example the case of injectors just for the maintenance of vehicles. In this case it happens that the valve of the injector is "glued" and can not be detached during startup by normal engine control.
- the actuation test 68 preceded by the measurements 62, 64, 66 of the measurement cycle 60, can rapidly detach the new injector.
- FIG. 4 is a second flow chart which details the steps of a cleaning cycle 70 also memorized and which can also be executed by the control unit 24.
- the cleaning connection not shown in the Figures, consists in connecting a pressure vessel 72 containing a cleaning fluid 74, solvent type, to the high pressure inlet of the injector 10.
- the pressure in the container 72 is sufficient to expel the fluid 74 out of the container 72 but remains much lower than the fuel pressure normally injected during normal operation of the engine.
- Such containers exist, especially in the form of anti-puncture spray for motorcycles or cars.
- the connection of the container 72 to the injector 10 is achieved by means of specific connections 76 to the injector model to be cleaned.
- the cleaning cycle 70 provides isolation and electrical continuity measurements 62 of the solenoid, electrical resistance 64 and inductance 66 as described above in the measurement cycle 60.
- a cleaning step 78 follows which follows. consists in circulating in the injector 10 the cleaning fluid 74 contained in the pressure vessel 72, while the injector 10 is activated alternately such as during the actuation test 68. Under the effect the pressure in the container 72, the fluid 74 enters the injector 10 via the high pressure inlet and then flows into the injector 10. Given the low pressure in the container 72 much lower than that of the fuel it does not matter. There is no injection of cleaning fluid 74 in the engine. The fluid 74 exits through the low pressure outlet of the injector 10, output by which normally the surplus fuel during a normal injection. The cleaning fluid 74 is then recovered and collected.
- the actuation test 68 has a duration of about ten seconds while during the cleaning cycle 70, the cleaning step 78, during which the injector 10 is actuated by the same way as during the actuation test 68, has a duration of about thirty seconds longer.
- the operator must connect the system 20, then, by means of the selector 30, he selects the selected cycle, measures 60 or cleaning 70, and then activates the selected cycle via the actuator button 32. As previously indicated these two operations can be done using two different means or by differentiated actions on a single means.
- the cycle takes place step by step by interrupting at the end of each step.
- the next step is started by simply pressing the actuator button 32.
- a complete cycle without external intervention and without the need for a connection modification is possible.
- the cycle is completed until either the end of the activation test 68 or cleaning 78.
- a step can be interrupted before its end by simply pressing the actuator button 32, then acting as a button " emergency stop ". This may, for example, be the case if during the cleaning step 78 a significant leak is observed, or if during the actuation of the injector an abnormal noise is heard.
- the measurements made are stored in the electronic control unit 24 and then transmitted to a central unit where they are stored, processed or printed.
- the transmission can be done in multiple ways as well as by means of a wire link, or Bluetooth, or Wi-fi, infra-red, or even via a USB stick connectable to the unit electronic control 24.
- the memorization of the measured data makes it possible, in connection with the identification of the vehicle, to establish a maintenance follow-up during the life of the vehicle.
- an update of the computer program stored in the electronic control unit 24 is possible.
- the new program can be made available via download on the Internet, or via an update CD or any other known means.
- the replacement of the program stored in the electronic control unit 24 by the updated program is via a transmission means such as among those described in the previous paragraph.
- the update of the program may include the characteristics of tests and measures already known, or even the addition of new measures. New models of injectors to be maintained can also bring an update of the program.
- Figure 5 shows a maintenance kit 82.
- the kit 82 includes a maintenance system 20 as previously described as well as additional specific adapters 40. These adapters 40, according to the description above, can be connected to the end of the first section 38 of the cable. Furthermore, each of the adapters 40 is provided with a connector 46 different and specific to an injector model 10.
- the kit 82 may furthermore include, but not shown in FIG. 5, a pressurized container 72 of cleaning fluid as well as the fittings 80 necessary to perform the cleaning connection.
- the operator must choose only the adapter 40 that is suitable for the injector 10 on which it must intervene, connect the adapter 40 to the system to then perform the measurement cycle 60 or cleaning 78 desired.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1159076A FR2981032B1 (fr) | 2011-10-07 | 2011-10-07 | Systeme de maintenance d'un injecteur |
| PCT/EP2012/069722 WO2013050530A1 (fr) | 2011-10-07 | 2012-10-05 | Systeme de maintenance d'un injecteur |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2764233A1 true EP2764233A1 (fr) | 2014-08-13 |
| EP2764233B1 EP2764233B1 (fr) | 2016-01-20 |
Family
ID=46970328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP12768848.9A Active EP2764233B1 (fr) | 2011-10-07 | 2012-10-05 | SYSTEME et méthode DE MAINTENANCE D'UN INJECTEUR |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US9624887B2 (fr) |
| EP (1) | EP2764233B1 (fr) |
| CN (1) | CN104114848B (fr) |
| FR (1) | FR2981032B1 (fr) |
| WO (1) | WO2013050530A1 (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3067066B1 (fr) * | 2017-05-31 | 2019-06-21 | Delphi Technologies Ip Limited | Systeme de maintenance |
| CN114646479A (zh) * | 2020-12-18 | 2022-06-21 | 博世汽车服务技术(苏州)有限公司 | 燃料喷射器检测装置、检测系统和检测方法 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4845979A (en) * | 1987-09-11 | 1989-07-11 | Ferocem Proprietary Limited | Electronic fuel injector service device |
| WO1990001623A1 (fr) * | 1988-08-05 | 1990-02-22 | Leonid Karnauchow | Appareil d'entretien pour injecteurs de carburant |
| FR2653168B1 (fr) * | 1989-10-13 | 1992-03-06 | Gary Alain | Dispositif de nettoyage et de controle d'injecteurs pour moteurs a essence. |
| US5633457A (en) * | 1992-06-05 | 1997-05-27 | Triangle Special Products | Fuel injection cleaning and testing system and apparatus |
| US6234002B1 (en) * | 1997-09-05 | 2001-05-22 | David W. Sisney | Apparatus and methods for cleaning and testing fuel injectors |
| JP4080115B2 (ja) * | 1999-10-26 | 2008-04-23 | ヤマハマリン株式会社 | エンジンの故障診断システム |
| ATE495356T1 (de) * | 2007-11-09 | 2011-01-15 | Delphi Technologies Holding | Fehlerdetektion in einer injektoranordnung |
| WO2011011378A1 (fr) * | 2009-07-20 | 2011-01-27 | Wayne State University | Système dinjection de carburant multidétection et son procédé de fabrication |
| DE102010029493A1 (de) * | 2010-05-31 | 2011-12-01 | Robert Bosch Gmbh | Vorrichtung zum Prüfen von Kraftstoffinjektoren sowie entsprechendes Verfahren |
-
2011
- 2011-10-07 FR FR1159076A patent/FR2981032B1/fr not_active Expired - Fee Related
-
2012
- 2012-10-05 US US14/349,086 patent/US9624887B2/en active Active
- 2012-10-05 WO PCT/EP2012/069722 patent/WO2013050530A1/fr not_active Ceased
- 2012-10-05 CN CN201280060135.6A patent/CN104114848B/zh active Active
- 2012-10-05 EP EP12768848.9A patent/EP2764233B1/fr active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2013050530A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2981032B1 (fr) | 2013-10-25 |
| CN104114848A (zh) | 2014-10-22 |
| EP2764233B1 (fr) | 2016-01-20 |
| US20150034125A1 (en) | 2015-02-05 |
| WO2013050530A1 (fr) | 2013-04-11 |
| FR2981032A1 (fr) | 2013-04-12 |
| CN104114848B (zh) | 2016-10-12 |
| US9624887B2 (en) | 2017-04-18 |
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