EP0880732B1 - Verfahren und vorrichtung zur prüfung und/oder einstellung von ventilen - Google Patents

Verfahren und vorrichtung zur prüfung und/oder einstellung von ventilen Download PDF

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Publication number
EP0880732B1
EP0880732B1 EP97909134A EP97909134A EP0880732B1 EP 0880732 B1 EP0880732 B1 EP 0880732B1 EP 97909134 A EP97909134 A EP 97909134A EP 97909134 A EP97909134 A EP 97909134A EP 0880732 B1 EP0880732 B1 EP 0880732B1
Authority
EP
European Patent Office
Prior art keywords
valve
flow
throughflow
ian
iab
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.)
Expired - Lifetime
Application number
EP97909134A
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German (de)
English (en)
French (fr)
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EP0880732A1 (de
Inventor
Eberhard SCHÖFFEL
Josef Seidel
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.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
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Anticipated expiration legal-status Critical
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    • 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 setting and / or testing valves according to General term of the independent claim.
  • White spirit has a constant density and viscosity as well as high purity. For these reasons, this is White spirit very expensive. In addition, the Evaporation of the white spirit is a considerable burden for the environment and workshop personnel. The use of others Media for testing is problematic, as compared to the Fuel a different hydraulic behavior exhibit.
  • the invention is based, with one Procedure for testing and adjusting valves Reduce costs and environmental impact. This task is characterized by those in the independent claim Features resolved.
  • the valve is also a gaseous medium.
  • This is a first Size the flow of the gaseous medium characterized and / or at least a second variable detected.
  • FIG. 1 shows a rough schematic representation of the invention Device and Figures 2 and 3 flow diagrams for explanation of the method according to the invention.
  • FIG. 1 the device according to the invention is rough shown schematically.
  • a solenoid valve 100 is shown.
  • This solenoid valve has a valve seat 105 and a valve chamber 110 Inlet 115 enters fuel in normal operation Valve chamber 110.
  • a spring is with 120 and a valve needle designated 125.
  • To move the valve needle is one Coil 130 provided.
  • means 135 for Adjustment of the spring force and a means 140 for Adjustment of the stroke of the solenoid valve needle 125 is provided.
  • the outlet of the valve is through a flow meter 140 with a pressure generator 145 in connection.
  • the coil 130 is connected to a Supply voltage U applied.
  • the second connection of the Coil 130 is connected to ground via a current measuring means 155 Connection.
  • a control unit 160 is also provided. This Control unit 160 acts on switching means 150 Signals and processes the output signals of the Flow meter 140 and the current measuring means 155 and also applied in a preferred embodiment the setting means 140 and 135 with corresponding sizes.
  • valve seat 105 In the de-energized state, the spring 120 presses the Valve needle 125 in the valve seat 105. In this when de-energized, the valve interrupts the connection between inlet 115 and outlet. By energizing the Coil 130 is applied a magnetic force against the Spring force or the mechanical force acts. This force causes the valve needle 125 from Valve seat 105 lifts off. The distance between valve seat 105 and valve needle 125 is referred to as stroke H.
  • valves The procedure according to the invention is not in this way limited by valves. It can also be used by others controlled valves are used, in which by means of of a control signal released a certain volume becomes. This also applies to valves be used by a spring in its open State are kept and in their de-energized State of flow released.
  • the solenoid valve with a defined voltage acted upon, that is, with a control signal one fixed length, the solenoid valve must have a certain length Hub H release the flow.
  • the volume that during the Control flows through the valve depends on several Factors. For one thing, this is the speed at which the solenoid valve opens, i.e. with which one Speed of the stroke from zero to the maximum value increases. This size determines the dynamic flow of the Solenoid valve. This essentially depends on the Spring 120 off. With the setting means 135 this can Speed can be set. By means of the Adjustment means 135 is an adjustment of the dynamic Flow possible.
  • the stroke is after a certain time at a certain control current, at different injectors different. thats why an adjusting device 140 is provided with which the stroke in static state set to a predeterminable value can be.
  • the solenoid valve is constantly energized, the static flow is measured and the adjustment device 140 set so that a certain, desired static flow.
  • the dynamic flow can also be carried out using compressed air.
  • valves with dynamic control is essentially determined by the length of the drive pulse (Control pulse duration) compared to the pulse period, the static flow and the time course of the Difference between the mechanical and the magnetic Forces determined.
  • the drive pulse duration corresponds to the time in which the Valve coil is energized.
  • the pulse period corresponds to the sum of the time in which the valve is energized and is not energized.
  • the static flow is Quantity that the valve is fully open during a flows through for a certain period of time.
  • the dynamic flow is the amount that the valve during a given Period of time when it flows through with a certain Duty cycle is controlled. As a duty cycle, will the ratio between drive pulse duration and Pulse period called.
  • the values of the dynamic and static flow are for fuel and gaseous substances usually differ.
  • the pneumatic dynamic flow QPN is understood one the amount of gas given at a given Duty cycle flows through the valve.
  • the differences between the individual solenoid valves that based in particular on the differences in the magnetic circuit, are inventively measured by measuring the static suit and waste flow detected.
  • the three parameters of pneumatic, dynamic flow QPN, Starting current IAN and waste current IAB can be more easily Measure wisely. Starting from these sizes with a gaseous medium is measured on the dynamic Flow of fuel QK to be closed. To do this with few valves, especially in the pre-series of Flow of fuel measured. Then the three parameters pneumatic, dynamic flow QPN, Pickup current IAN and waste current IAB recorded and corresponding Conversion factors determined.
  • the elimination of the hydraulic medium is advantageous the determination of the dynamic flow of fuel, because for measuring the flow the easily available and extremely environmentally friendly atmospheric air as gaseous Medium is used.
  • the slow and expensive hydraulic Volume measurement is faster and cheaper pneumatic flow measurement replaced.
  • the measurement of the static pull-in and waste flows are indicated by a simple measurement and display procedure determined.
  • the parameters starting current IAN, waste current IAB and the pneumatic-dynamic flow QPN have a strong Dependence on fuel flow and are very simple and to determine quickly in series production.
  • the device shown in FIG. 1 is suitable for this.
  • the pressure generator 145 generates a specifiable pressure, with which is the outlet of the solenoid valve. Between that is the pressure generator and the outlet of the valve Flow measuring means 140 arranged.
  • a pressure measuring device 140 an orifice plate is preferably used as a pressure measuring device 140. The measurement is done by acting on the valve, counter to normal flow direction, with a pneumatic pressure that preferably assumes values of approximately 600 millibars.
  • the pneumatic-dynamic Flow indicates and the flow of the characterized gaseous medium, the coil 130 with a predetermined duty cycle.
  • the coil is energized for 3 milliseconds, where the period, that is the distance between the The start of two energizations is 6 milliseconds.
  • the Control frequency in this example is 166.7 Hz.
  • a second variable is recorded, which is called Starting current IAN and / or referred to as waste current IAB becomes.
  • the voltage U across the coil 130 is applied, continuously increased.
  • the Coil current detected with the current measuring means 155 The opening of the injector is detected when the flow suddenly increases. This is a pressure drop in the Area of pressure generator 145 or of the flow measuring means 140 recognized. The pressure drop is around 25 mbar.
  • the Current value at which the solenoid valve opens is called Starting current IAN and at which the solenoid valve closes when Waste current IAB designated.
  • This measurement can be carried out automatically by the control unit 160, can be carried out manually or semi-automatically. So can for example, the measurement and the Adjustment of the valve automatically from the control unit 160 is executed. But it is also possible that the Control unit 160 performs the measurements and the Setting is carried out manually. It’s even possible that you work without a control unit. This means that the valve with a suitable signal generator Control signals is applied and the measurement and Settings are made manually.
  • Sizes A, B, C and D are constants, that with a few copies of injectors same design must be determined.
  • the sizes A, B and C are of a similar order of magnitude much smaller.
  • FIG Setting The procedure according to the invention is shown in FIG Setting the valve using a flow chart shown.
  • a first step 200 the valve in the measuring device installed and with a defined Control signal applied. It can go in or out normal flow direction of the valve.
  • the Step 210 becomes the pull-in current IAN and in step 220 the Waste current IAB measured.
  • the measurement of these first two Sizes are shown in more detail in FIG. 3.
  • Step 230 the solenoid valve is also a fixed duty cycle.
  • Step 240 takes the measurement of a first quantity, which is called of the pneumatic-dynamic flow QPN by means of the flow meter 140.
  • step 245 based on these three Parameters with the above formula of these sizes corresponding dynamic flow for fuel QK certainly.
  • the query 250 checks whether this value QK of deviates from an expected setpoint QKS. To do this for example, checks whether the difference between the dynamic flow for fuel QK and the expected Setpoint QKS is less than a threshold value S. Is this the If so, the injector is set correctly and the The checking and setting process ends in step 270.
  • the Target values for the sizes QPN, IAN and IAB in advance for some Valves determined. In this case the calculation can be done in Step 245 is omitted. Then in step 250 the values QPN, IAN and / or IAB with the corresponding expected Compared values.
  • a Adjustment of the valve if there is a discrepancy between the first size and a predefinable setpoint for the first Size and / or if there is a discrepancy between the second Size and a predefinable setpoint for the second size
  • the hydraulic properties of the valve becomes one pneumatic and two electrical quantities used. These sizes are easy and quick to measure. Based on these measured quantities, a hydraulic size determined and the balancing means so set the hydraulic size to an expected Corresponds to the setpoint. Before the measurement, the Factors, A, B, C and D by measurement with fuel and with Air can be determined with a small number of valves.
  • a voltage value U0 given. This voltage value is chosen so that none or only a very small current flows at which the The solenoid valve certainly does not open yet.
  • Step 305 detects the pneumatic flow QPN0.
  • step 310 the voltage value U um increases a predetermined value ⁇ U.
  • Step 350 is the measurement of the new value QPN1 for the pneumatic flow.
  • step 320 the difference ⁇ QPN between the old and the new value for the pneumatic flow determined.
  • the subsequent query 325 checks whether this value is greater than a threshold. Is not this the case, that is, the pressure has not dropped and the Solenoid valve needle has not yet lifted off, so in Step 330 the old value QPN0 with the new value QPN1 is replaced and the voltage value is repeated in step 310 elevated.
  • Query 325 recognizes that the pressure has dropped or the flow has increased, the Valve needle 125 is lifted and the starting current is IAN reached. In step 35, therefore Current measuring means 155 the current I measured and as Tightening current IAN saved. To capture the Starting current, the current value is ramped with a constant slope of, for example, 0.001 milliamps per Millisecond increased. Reaching the pull-in current will through continuous monitoring of the pneumatic Flow rate QPN determined. Accordingly, the Waste stream IAB proceeded. In step 340, the Voltage U is reduced by a predeterminable value ⁇ U. In Step 345 becomes the new flow rate value QPN1 measured and in step 350 with the old value QPN zero compared.
  • step 360 Detects query 355 based on the difference ⁇ QPN Comparison with a threshold SW that the flow rate has not decreased, that is, the valve needle is still has not moved, step 360 is performed by the old one Value overwritten with the new value and then in Step 340 further reduces the voltage. Recognize that Query 355 a drop in the flow, so in Step 365 the current current value I recorded and as Waste stream IAB saved.
  • the values for the control duration of 5 milliseconds and for the period duration of 10 milliseconds is only an example chosen. These values are chosen to be as small as possible because in in this case a better correlation between the hydraulic and pneumatic flows.
  • the conversion of the parameters IAN, IAB and QPN via the Correlation in hydraulic flow is automatic in the control unit 160, so that to be set Target values directly fuel values can be used.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Flow Control (AREA)
  • Magnetically Actuated Valves (AREA)
  • Measuring Volume Flow (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
EP97909134A 1996-11-25 1997-09-17 Verfahren und vorrichtung zur prüfung und/oder einstellung von ventilen Expired - Lifetime EP0880732B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19648689 1996-11-25
DE19648689A DE19648689A1 (de) 1996-11-25 1996-11-25 Verfahren und Vorrichtung zur Prüfung und/oder Einstellung von Ventilen
PCT/DE1997/002081 WO1998024014A1 (de) 1996-11-25 1997-09-17 Verfahren und vorrichtung zur prüfung und/oder einstellung von ventilen

Publications (2)

Publication Number Publication Date
EP0880732A1 EP0880732A1 (de) 1998-12-02
EP0880732B1 true EP0880732B1 (de) 2000-02-16

Family

ID=7812660

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Application Number Title Priority Date Filing Date
EP97909134A Expired - Lifetime EP0880732B1 (de) 1996-11-25 1997-09-17 Verfahren und vorrichtung zur prüfung und/oder einstellung von ventilen

Country Status (9)

Country Link
US (1) US6311553B1 (ko)
EP (1) EP0880732B1 (ko)
JP (1) JP4083230B2 (ko)
KR (1) KR100504414B1 (ko)
CN (1) CN1147766C (ko)
DE (2) DE19648689A1 (ko)
ES (1) ES2143853T3 (ko)
RU (1) RU2189488C2 (ko)
WO (1) WO1998024014A1 (ko)

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JP4305805B2 (ja) * 2001-04-27 2009-07-29 株式会社デンソー 噴射量測定装置
DE10150786C2 (de) * 2001-10-15 2003-08-07 Siemens Ag Verfahren und Vorrichtung zum automatischen Einstellen von Injektoren
DE10224258B4 (de) * 2002-05-31 2007-02-01 Robert Bosch Gmbh Verfahren zur Begrenzung des maximalen Einspritzdruckes an magnetgesteuerten, nockengetriebenen Einspritzkomponenten
DE10240880B4 (de) * 2002-09-04 2016-12-01 Robert Bosch Gmbh Aktorverbindung an Kraftstoffinjektoren von Verbrennungskraftmaschinen
DE10312087A1 (de) * 2003-03-19 2004-10-07 Daimlerchrysler Ag Verfahren zur Funktionsprüfung eines Hydraulikventils und Prüfstand zur Durchführung des Verfahrens
GB0325184D0 (en) * 2003-10-28 2003-12-03 Dt Assembly & Test Europ Ltd An automotive fuel injector leakage tester
DK177454B1 (da) * 2011-11-09 2013-06-17 Iop Marine As Fremgangsmåde til afprøvning af en gasinjektionsventil samt et anlæg til udøvelse af fremgangsmåden
DK177530B1 (da) 2012-02-22 2013-09-08 Iop Marine As Fremgangsmåde til afprøvning af en gas shut-down ventil samt et anlæg til udøvelse af fremgangsmåden
CN105257448B (zh) * 2015-10-06 2017-07-14 北京工业大学 一种柴油机高压燃油系统锥阀动态可视化实现装置及实现方法
US11022041B2 (en) 2015-10-13 2021-06-01 Raytheon Technologies Corporation Sensor snubber block for a gas turbine engine
US10920729B2 (en) * 2017-02-08 2021-02-16 Pratt & Whitney Canada Corp. Method and system for testing operation of solenoid valves
CN111795816B (zh) * 2020-07-14 2021-05-18 浙江大学 一种控制阀套筒的流量特性测量装置及其方法

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Also Published As

Publication number Publication date
WO1998024014A1 (de) 1998-06-04
DE59701133D1 (de) 2000-03-23
KR19990081928A (ko) 1999-11-15
US6311553B1 (en) 2001-11-06
KR100504414B1 (ko) 2005-10-31
DE19648689A1 (de) 1998-05-28
RU2189488C2 (ru) 2002-09-20
JP4083230B2 (ja) 2008-04-30
JP2000504389A (ja) 2000-04-11
EP0880732A1 (de) 1998-12-02
ES2143853T3 (es) 2000-05-16
CN1147766C (zh) 2004-04-28
CN1208476A (zh) 1999-02-17

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