EP2432982A1 - Verfahren zu messung des ankerhubs in einem kraftstoffinjektor - Google Patents
Verfahren zu messung des ankerhubs in einem kraftstoffinjektorInfo
- Publication number
- EP2432982A1 EP2432982A1 EP10715831A EP10715831A EP2432982A1 EP 2432982 A1 EP2432982 A1 EP 2432982A1 EP 10715831 A EP10715831 A EP 10715831A EP 10715831 A EP10715831 A EP 10715831A EP 2432982 A1 EP2432982 A1 EP 2432982A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- armature
- injector
- measuring
- fuel injector
- probe
- 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
- F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing
-
- 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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/063—Lift of the valve needle
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/24—Fuel-injection apparatus with sensors
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
- F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
- F02M2200/308—Fuel-injection apparatus having mechanical parts, the movement of which is damped using pneumatic means
Definitions
- the invention relates to a method for measuring the armature stroke in a fuel injector.
- the armature stroke is determined by a laser measuring device. Such laser measuring devices can not be used because of the high cost and high investment costs in the service sector in the rule.
- the object of the invention is to provide a simplified method for measuring the armature stroke in a fuel injector whose accuracy is comparable to the known laser measurement.
- An inventive method of measuring the armature stroke in a fuel injector includes the steps of inserting a probe into the fuel injector such that the probe contacts the armature; driving the injector so that the armature performs a lifting movement; and measuring the
- the method according to the invention enables a simple measurement of the armature stroke with high accuracy.
- the measurement can also be carried out on injectors wetted with fuel or oil. It can be made an intermediate test after assembly of the injector and in service, the state of the injector can be determined easily and quickly, so that a wear-dependent replacement of the fuel injector is possible.
- the fact that the measuring probe rests directly on the armature allows the armature stroke to be measured with high accuracy.
- the injector is driven with no more than ten, preferably no more than five consecutive pulses. Actuation of the injector with no more than ten or five consecutive pulses prevents the injector from overheating.
- the injector is not driven again after the activation for at least 30 seconds. This allows the heated injector to cool, thus preventing damage to the injector caused by overheating.
- the method additionally comprises comparing the measured values for the armature stroke with predetermined target values. By comparing the measured values with predetermined target values, errors of the injector can be detected particularly simply and effectively.
- the probe is introduced into the fuel injector by a fuel return bore formed in the fuel injector. Thanks to the fuel return bore, the probe can be inserted into the fuel injector particularly easily. In particular, it is not necessary to open or disassemble the fuel injector to perform a measurement of the armature stroke.
- the probe is attenuated during the measurement. Damping avoids measuring errors caused by overshooting and protects the measuring device, as it avoids hard impacts on the measuring device.
- the probe is pneumatically damped.
- the degree of damping can be set particularly easily by varying the pressure in the damping device.
- the probe is damped by a spring.
- a spring damping requires little effort and is particularly low maintenance and robust.
- FIG. 1 shows a measuring device for carrying out the method according to the invention
- Figure 2 is a current profile of a control of the injector according to the invention.
- FIG. 3 shows a detail of an injector into which a probe according to the invention has been introduced.
- FIG. 1 shows schematically a device for carrying out the measuring method according to the invention.
- the device comprises a stand 68 with a first holding device 70 for the injector 1 to be tested.
- the injector 1 is securely fastened in the first holding device 70.
- a second holding device 72 which holds a dial indicator 52, is fastened to the stand 68.
- the dial indicator 52 has a measuring probe 50.
- the dial indicator 52 is arranged above the injector 1 such that the measuring probe 50 runs parallel to the longitudinal axis of the injector and the
- a non-recognizable in the fi gure 1 drain hole is formed, in which excess fuel from the injector 1 can flow during operation.
- the measuring probe 50 is inserted through the drain hole in the interior of the injector 1.
- the vertical distance between the dial gauge 52 and the injector 1 is set so that the measuring probe 50 touches an armature in the interior of the injector 1, which is not visible in FIG. 1, so that a lifting movement of the armature is transmitted to the measuring probe 50 and transmitted by the sensor Dial gauge 52 is displayed.
- the dial indicator 52 is provided with a pneumatic damping device 54, which dampens the stroke movement of the measuring probe 50 during operation.
- the pneumatic damping device 54 is connected via a hose 56 to a pressure generating device 58, which generates the desired pneumatic pressure in the damping device 54.
- a pressure generating device 58 By varying the pressure generated by the pressure generating device 58, the degree of damping can be easily adjusted within a wide range.
- the measured values and / or results of the evaluations tion are displayed on a display and / or printed by a printer.
- the evaluation device 62 can also have a memory device and / or a data transmission device in order to store the measured values and / or results and / or to transmit them to a further device.
- the data transmission device can be, for example, a wired or wireless network connection or a connection for an external storage medium, such as a USB stick.
- the dial gauge 52 and the evaluation device 62 each have a resolution of at least 1 micron.
- the injector 1 is connected via an electrical connection line 64 with a control electronics 66, which is designed to control the injector 1 periodically.
- a control electronics 66 which is designed to control the injector 1 periodically.
- control electronics 66 and the pressure generating device 58 can also be equipped with a network connection and / or a connection for an external storage medium, by means of which control programs can be transmitted to the device.
- FIG. 2 shows a detail of a current profile for controlling the injector in a method according to the invention.
- the current flowing through the injector current I over the time (x-axis) is plotted on the y-axis.
- the on-time T e ⁇ n is chosen short in order to control the injector 1 as "hard” as possible. Due to the mechanical inertia of the dial gauge 52, the switch-on time T should, however, not fall below 100 microseconds in order not to falsify the measurement result. After the current I has reached the maximum value I max , it is kept at this maximum value I max for a time T. After the time T, the current is turned off and falls within the off time T off to zero.
- the switch-off time T off is in the range of the switch-on time Tein. After expiration of the pause duration T p , a switch-on process is carried out again and a further switch-on pulse is generated. In order to obtain reproducible measurement results, the process is repeated several times.
- the injector 1 Since the injector 1 is not cooled by fuel in the measuring device other than in the regular operation, it is necessary to stop the drive after a certain number of pulses in order to avoid overheating of the injector 1.
- the control is locked after completion of a measurement process with five to ten consecutive pulses for at least 30 seconds, in order to allow sufficient cooling of the injector 1.
- Compliance with the predetermined ratio between the duty cycle T and the pause duration T p is mandatory in order to produce reproducible measured values.
- FIG. 3 shows a section through the upper region of a fuel injector 1 into which a probe 50 of a dial gauge 52 is inserted for carrying out the method according to the invention.
- the fuel injector 1 has a cylindrical nozzle body 12 which is hydraulically tightly clamped by a nozzle retaining nut 1 1 with a magnetic head 15 arranged above the nozzle body 12.
- the position of the magnetic head 15 is in relation to the nozzle body 12 by the choice of the thickness of a see between the magnetic head 15 and the nozzle body 12 inserted stroke 6 adjustable.
- a valve member 10 having an axial bore which is open on the side remote from the magnetic head 15 side.
- a nozzle needle 14 is inserted into the hole.
- the nozzle needle 14 is movable parallel to a longitudinal axis of the injector 1, so that the end of the Nozzle needle 14 defines a formed by the bore in the valve member 10 control chamber 16, the volume of which is variable by moving the nozzle needle 14 parallel to the longitudinal axis of the injector 1.
- the nozzle needle 14 is movable by varying the pressure in the control chamber 16 between a lower closed position in which the nozzle needle 14, not shown injection ports of the injector 1 closes, and an upper injection position in which the nozzle needle 14, the injection ports are free.
- a blind bore 20 is formed along the longitudinal axis of the injector 1, which extends from the control chamber 16 through the valve piece 10 into the projection 18 without completely penetrating the projection 18.
- Two outlet throttles 22 connect the upper, remote from the nozzle needle 14 end of the blind bore 20 hydraulically with the outer periphery of the projection 18.
- the formation of two outlet throttles 22 in the embodiment shown in the figure 3 is only an example, in particular, only one Outflow throttle 22 may be formed.
- an armature 2 Arranged around the projection 18 is an armature 2, which is rotationally symmetrical about the longitudinal axis of the injector and encloses the projection 18 in the manner of a sleeve.
- the armature 2 is movable parallel to the longitudinal axis of the injector 1 between a closed lower position shown in FIG. 1 and an opened, upper position.
- a seat volume 24 is formed on the circumference of the projection 18 between the armature 2 and the projection 18.
- the seat volume 24 is in fluid communication with the control chamber 16 via the outlet throttles 22 and the blind bore 20.
- a sealing seat 26 is formed, which is closed by the armature 2, when the
- Anchor 2 as shown in Figure 3, in the lower, closed position.
- a central Ankerablaufbohrung 30 is formed.
- the sealing seat 26 When the sealing seat 26 is open, the seat volume 24 is in hydraulic communication with the armature drainage bore 30.
- the sealing seat 26 is closed, the seat volume 24 is hydraulically sealed.
- an anchor plate 48 At the upper, facing away from the valve plate 10 end of the armature 2, an anchor plate 48 is formed, which extends from the armature drain hole 30 radially outward.
- an electromagnet 3 is arranged above the armature plate 48 on the magnetic head 15.
- an armature spring 4 is arranged, which is supported on the one hand on the armature plate 48 and on the other hand on the magnetic head 15.
- the armature spring 4 presses the armature 2 with the solenoid 3 is not activated in the lower, closed position in which the armature 2 closes the sealing seat 26 and the seat volume 24 closes hydraulically.
- a shim 34 is provided between the armature spring 4 and the magnetic head 15.
- the thickness of the dial 34 By choosing the thickness of the dial 34, the force with which the armature 2 is pressed by the armature spring 4 against the valve member 10, adjustable.
- a gap plate 5 On the electromagnet 3 side facing the armature plate 48 is a gap plate 5, which ensures a minimum distance between the armature plate 48 and the electromagnet 3 when the armature 2 is in the upper position. Thus, the armature 2 is prevented from contacting the electromagnet 3 in the upper position and adhering to it magnetically or hydraulically.
- an inlet channel 36 is formed in the nozzle body 12, which is connected via a fuel line 37 with an external fuel source 8.
- an inlet throttle 38 is formed, which connects the inlet channel 36 hydraulically with the control chamber 16, so that the control chamber 16 via the fuel line 37, the inlet channel 36 and the inlet throttle 38 with high pressure fuel from the fuel source 8 can be filled is.
- the Wegvo- Lumen 24 hydraulically connected to the control chamber 16, so that in the hydraulic equilibrium in the seat volume 24, the same pressure as in the control chamber 16 prevails.
- the armature 2 By activating the electromagnet 3, the armature 2 can be moved from the lower closure position shown in FIG. 3 into an upper, open position. The distance traveled by the armature 2 is the armature stroke to be measured in the method according to the invention.
- the measuring probe 50 of a dial gauge 52 arranged above the injector 1 is introduced into the injector 1 through the drainage hole 7 and the central outlet 31 in such a way that it touches the anchor plate 48.
- a lifting movement of the armature 2 is transmitted by the measuring probe 50 to the dial gauge 52.
- the measuring probe 50 is moved parallel to the lifting movement of the armature 2, i. inserted parallel to the longitudinal axis of the injector 1.
- the measurement can be easily performed without opening or disassembling the injector. Because the probe 50 is in direct mechanical contact with the anchor plate 48, the anchor stroke can be accurately determined even if the anchor plate 48 is covered with fuel or oil.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009003258A DE102009003258A1 (de) | 2009-05-20 | 2009-05-20 | Verfahren zu Messung des Ankerhubs in einem Kraftstoffinjektor |
| PCT/EP2010/055528 WO2010133423A1 (de) | 2009-05-20 | 2010-04-26 | Verfahren zu messung des ankerhubs in einem kraftstoffinjektor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2432982A1 true EP2432982A1 (de) | 2012-03-28 |
| EP2432982B1 EP2432982B1 (de) | 2017-06-14 |
Family
ID=42174358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10715831.3A Active EP2432982B1 (de) | 2009-05-20 | 2010-04-26 | Verfahren zu messung des ankerhubs in einem kraftstoffinjektor |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2432982B1 (de) |
| DE (1) | DE102009003258A1 (de) |
| WO (1) | WO2010133423A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012206484A1 (de) | 2012-04-19 | 2013-10-24 | Robert Bosch Gmbh | Kraftstoffinjektor mit einer Vorrichtung zur Messung eines Ankerhubs |
| CN103850851B (zh) * | 2014-01-26 | 2017-04-12 | 北京博润宏达科技发展有限公司 | 共轨喷油器衔铁动态升程检测方法及系统 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3031564A1 (de) | 1980-08-21 | 1982-04-08 | Robert Bosch Gmbh, 7000 Stuttgart | Elektromagnetisches kraftstoffeinspritzventil und verfahren zur herstellung eines elektromagnetischen kraftstoffeinspritzventiles |
| GB2340610A (en) * | 1998-08-18 | 2000-02-23 | Lucas Ind Plc | Needle lift sensor |
| AU7199700A (en) * | 2000-03-21 | 2001-09-27 | Detroit Diesel Corporation | Condition sensor for a fuel injector |
| EP1446560B1 (de) * | 2001-11-21 | 2005-07-06 | FEV Motorentechnik GmbH | Sensoranordnung zur erfassung der bewegung eines ankers mit unterdrückung von störspannungen |
-
2009
- 2009-05-20 DE DE102009003258A patent/DE102009003258A1/de not_active Withdrawn
-
2010
- 2010-04-26 EP EP10715831.3A patent/EP2432982B1/de active Active
- 2010-04-26 WO PCT/EP2010/055528 patent/WO2010133423A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2010133423A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102009003258A1 (de) | 2010-11-25 |
| EP2432982B1 (de) | 2017-06-14 |
| WO2010133423A1 (de) | 2010-11-25 |
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