EP0880732A1 - Method and device for examining and/or adjusting valves - Google Patents
Method and device for examining and/or adjusting valvesInfo
- Publication number
- EP0880732A1 EP0880732A1 EP97909134A EP97909134A EP0880732A1 EP 0880732 A1 EP0880732 A1 EP 0880732A1 EP 97909134 A EP97909134 A EP 97909134A EP 97909134 A EP97909134 A EP 97909134A EP 0880732 A1 EP0880732 A1 EP 0880732A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flow
- valve
- variable
- 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.)
- 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
Definitions
- the invention relates to a method and a device for adjusting and / or testing valves according to the preamble of the independent claim.
- Valves are charged with a highly precise hydraulic medium, which is referred to as white spirit in the following.
- white spirit defined control and measurement of the flow rate detects the actual flow rate and the valve is set in such a way that a defined flow rate is set when the control is defined.
- the white spirit has a constant density and viscosity as well as a high purity. For these reasons, this white spirit is very expensive.
- the evaporation of the white spirit creates a considerable burden on the environment and the workshop staff.
- the use of other media for testing is problematic, since they have a different hydraulic behavior compared to the fuel.
- the invention has for its object to reduce the cost and environmental impact in a method for testing and adjusting valves. This object is achieved by the features characterized in the independent claim.
- a gaseous medium is applied to the valve.
- a first variable which characterizes the flow of the gaseous medium and / or at least a second variable is recorded.
- FIG. 1 shows a roughly schematic representation of the invention
- a solenoid valve 100 is shown in a simplified representation.
- This solenoid valve has a valve seat 105 and a valve chamber 110. Fuel enters the valve chamber 110 in normal operation via an inlet 115.
- a spring is identified by 120 and a valve needle by 125.
- a coil 130 is provided for moving the valve needle.
- Means 135 for adjusting the spring force and means 140 for adjusting the stroke of the solenoid valve needle 125 are also provided.
- the outlet of the valve communicates with a pressure generator 145 via a flow meter 140.
- the coil 130 is supplied with a supply voltage U via a switching means 150.
- the second connection of the coil 130 is connected to ground via a current measuring means 155.
- a control unit 160 is also provided. This control unit 160 acts on the switching means 150 with signals and processes the output signals of the flow meter 140 and the current measuring means 155 and, in a preferred exemplary embodiment, also acts on the setting means 140 and 135 with corresponding quantities.
- the spring 120 presses the valve needle 125 into the valve seat 105
- the valve breaks the connection between the inlet 115 and the outlet.
- a magnetic force is applied which acts against the spring force or the mechanical force. 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.
- the procedure according to the invention is not limited to this type of valve. It can also be used with other controlled valves in which a specific volume is released by means of a control signal. Thus, the procedure can also be used for valves which are held in their open state by a spring and which release the flow in their de-energized state.
- the solenoid valve must release the flow with a certain stroke H.
- the volume that flows through the valve during actuation depends on several factors. On the one hand, this is the speed at which the solenoid valve opens, i.e. the speed at which the stroke increases from zero to the maximum value.
- This variable determines the dynamic flow of the solenoid valve. This essentially depends on the spring 120. This speed can be set with the setting means 135. The dynamic flow can be set by means of the setting means 135.
- the stroke that occurs after a certain time with a certain control current is different for different injection valves. thats why an adjusting device 140 is provided with which the stroke in the static state can be set to a predeterminable value.
- the solenoid valve is constantly energized, the static flow is measured and the adjusting device 140 is set so that a specific, desired static flow is established.
- This adjustment work is usually carried out with fuel, in particular with a high-precision hydraulic medium.
- Heptane is preferably used for this.
- the use of this hydrocarbon is problematic for several reasons.
- the dynamic flow can also be carried out using compressed air.
- valves in dynamic control is essentially determined by the length of the control pulse (control pulse duration) compared to the pulse period, the static flow and the time course of the difference between the mechanical and magnetic forces.
- the control 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 not energized.
- Static flow is the amount that the fully open valve flows through for a certain period of time.
- the dynamic flow is the amount that the valve flows through during a certain period of time when it is driven with a certain duty cycle.
- the duty cycle is the ratio between the control pulse duration and the pulse period.
- the values of the dynamic and the static flow are usually different for fuel and gaseous substances.
- the temporal variation of the force difference between the magnetic force and the mechanical force together with the dynamic flow of fuel can be detected by measuring the pneumatic, dynamic flow QPN.
- Pneumatic dynamic flow QPN is the amount of gas that flows through the valve at a given duty cycle.
- the differences between the individual solenoid valves which are based in particular on the differences in the magnetic circuit, are detected according to the invention by measuring the static attraction and waste flow.
- the three parameters of pneumatic, dynamic flow QPN, starting current IAN and waste current IAB can be measured in a simple manner. Based on these quantities, which are measured with a gaseous medium, the dynamic flow of fuel QK will be inferred. For this purpose, the flow of fuel is measured with a few valves, especially in the pre-series. The three parameters of pneumatic, dynamic flow QPN, starting current IAN and waste current IAB are then recorded and corresponding conversion factors are determined.
- the elimination of the hydraulic medium is advantageous when determining the dynamic flow of fuel, since the readily available and extremely environmentally friendly atmospheric air is used as the gaseous medium to measure the flow.
- the slow and expensive hydraulic quantity measurement is made faster and cheaper pneumatic flow measurement replaced.
- the measurement of the static pull-in and waste current is determined by a simple measuring and display procedure.
- the parameters pull-in current IAN, waste current IAB and the pneumatic-dynamic flow QPN have a strong one
- the device shown in FIG. 1 is suitable for this.
- the pressure generator 145 generates a predeterminable pressure which is applied to the outlet of the solenoid valve.
- the flow measuring means 140 is arranged between the pressure generator and the outlet of the valve.
- a measuring orifice is preferably used as the pressure measuring means 140. The measurement is therefore carried out by applying a pneumatic pressure to the valve in the direction opposite to the normal flow direction, which preferably takes on values of approximately 600 millibars.
- the coil 130 is acted upon with a predetermined duty cycle. For example, the coil is energized for 3 milliseconds, the period, that is to say the distance between the start of two energizations, being 6 milliseconds.
- the control frequency is 166.7 Hz in this example.
- the solenoid valve opens and closes at this frequency.
- the magnetic force has a significant influence on the pneumatic, dynamic flow.
- a quick opening there is a large, with a slow opening, due to a large spring force, a small flow rate.
- a second variable is recorded, which is referred to as the starting current IAN and / or as the waste current IAB.
- the voltage U applied to the coil 130 is continuously increased.
- Coil current detected with the current measuring means 155 The opening of the injection valve is recognized when the flow suddenly increases. This is recognized by a pressure drop in the area of the pressure generator 145 or the flow measuring means 140. The pressure drop is around 25 mbar.
- the voltage is then reduced and the point in time at which the valve closes again is determined.
- the current value at which the solenoid valve opens is called
- waste current IAB Starting current IAN and at which the solenoid valve closes
- This measurement can be carried out automatically by the control unit 160, manually or semi-automatically.
- the control unit 160 it can be provided that the measurement and setting of the valve is carried out automatically by the control unit 160.
- the control unit 160 it is also possible for the control unit 160 to carry out the measurements and for the setting to be carried out manually. It is even possible to work without a control unit. This means that the valve is supplied with a suitable signal generator with control signals and the measurement and the settings are carried out manually.
- Sizes A, B, C and D are constants that have to be determined for a few examples of injection valves of the same type.
- the dynamic flow QK for fuel and the quantities starting current IAN, waste flow and the pneumatic, dynamic flow QPN with compressed air are measured with the same control signals for a few valves of the same type.
- the conversion factors A, B, C and D can be determined on the basis of these measured values. Sizes A, B and C are of a similar order of magnitude and size D is much smaller.
- FIG. 2 shows the procedure according to the invention for adjusting the valve on the basis of a flow chart.
- the valve is installed in the measuring device and a defined control signal is applied to it. It can be installed against or in the normal flow direction of the valve.
- the step current IAN is measured in step 210 and the waste current IAB is measured in step 220. The measurement of these first two quantities is shown in more detail in FIG. 3.
- step 230 the solenoid valve is subjected to a fixed duty cycle. Then, in step 240, the measurement of a first variable, which is referred to as the pneumatic-dynamic flow rate QPN, takes place by means of the flow meter 140.
- a first variable which is referred to as the pneumatic-dynamic flow rate QPN
- step 245 based on these three parameters, the dynamic flow rate for fuel QK corresponding to these variables is determined using the formula given above.
- the query 250 checks whether this value QK of deviates from an expected setpoint QKS. For this purpose, it is checked, for example, whether the difference between the dynamic flow rate for fuel QK and the expected target value QKS is less than a threshold value S. If this is the case, the injection valve is correctly set and the testing and setting process ends in step 270.
- the solenoid valve is adjusted in step 260.
- the setting means 135 and / or 140 is influenced in a suitable manner. Steps 210 to 250 are then processed again.
- the target values for the quantities QPN, IAN and IAB are determined in advance for some valves. In this case, the calculation in step 245 can be omitted.
- the values QPN, IAN and / or IAB are then compared with the corresponding expected values.
- the valve is compared if there is a deviation between the first variable and a predefinable target value for the first variable and / or if there is a deviation between the second variable and a predefinable target value for the second variable
- One pneumatic and two electrical variables are used to adjust the hydraulic properties of the valve. These sizes are easy and quick to measure. On the basis of these measured quantities, a hydraulic quantity is determined and the balancing means are set so that the hydraulic quantity corresponds to an expected target value. Before the measurement, the factors A, B, C and D must be determined by measuring with fuel and with air with a small number of valves. The majority of the valves are then only checked and adjusted with air.
- a voltage value U0 is specified. This voltage value is selected so that no or only a very small current flows at which the solenoid valve certainly does not open.
- the pneumatic flow QPN0 is then detected in step 305.
- step 310 the voltage value U is increased by a predetermined value ⁇ U.
- the new value QPN1 for the pneumatic flow is then measured in step 350.
- the difference ⁇ QPN between the old and the new value for the pneumatic flow is then determined in step 320.
- the subsequent query 325 checks whether this value is greater than a threshold value. If this is not the case, that means the pressure has not dropped and the
- Solenoid valve needle has not yet lifted, the old value QPN0 is replaced by the new value QPN1 in step 330 and the voltage value is increased again in step 310.
- step 35 the current measuring means 155 therefore measures the current I and as
- Tightening current IAN saved.
- the current value is increased in a ramp shape with a constant slope of, for example, 0.001 milliamperes per millisecond. Reaching the pull-in current is monitored by the pneumatic Flow rate QPN determined. The same procedure is followed for the waste stream IAB.
- the voltage U is reduced by a predeterminable value ⁇ U.
- the new value QPN1 for the flow is measured and in step 350 it is compared with the old value QPN zero.
- step 360 takes place in which the old value is overwritten by the new value and then in step 340 the voltage is further reduced. If query 355 detects a drop in the flow rate, the current current value I is recorded in step 365 and stored as a drop current IAB.
- control duration 5 milliseconds and for the period duration of 10 milliseconds are selected only as examples. These values are chosen to be as small as possible, since in this case there is a better correlation between the hydraulic and pneumatic flows.
- the conversion of the parameters IAN, IAB and QPN via the correlation into hydraulic flow takes place automatically in the control unit 160, so that it is to be set
- Target values directly fuel values can be used.
Landscapes
- 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)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19648689 | 1996-11-25 | ||
DE19648689A DE19648689A1 (en) | 1996-11-25 | 1996-11-25 | Method and device for testing and / or adjusting valves |
PCT/DE1997/002081 WO1998024014A1 (en) | 1996-11-25 | 1997-09-17 | Method and device for examining and/or adjusting valves |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0880732A1 true EP0880732A1 (en) | 1998-12-02 |
EP0880732B1 EP0880732B1 (en) | 2000-02-16 |
Family
ID=7812660
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97909134A Expired - Lifetime EP0880732B1 (en) | 1996-11-25 | 1997-09-17 | Method and device for examining and/or adjusting valves |
Country Status (9)
Country | Link |
---|---|
US (1) | US6311553B1 (en) |
EP (1) | EP0880732B1 (en) |
JP (1) | JP4083230B2 (en) |
KR (1) | KR100504414B1 (en) |
CN (1) | CN1147766C (en) |
DE (2) | DE19648689A1 (en) |
ES (1) | ES2143853T3 (en) |
RU (1) | RU2189488C2 (en) |
WO (1) | WO1998024014A1 (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9930120D0 (en) * | 1999-12-21 | 2000-02-09 | Assembly Technology & Test Lim | Monitoring equipment for monitoring the performance of an engine fuel injector valve |
GB0009165D0 (en) * | 2000-04-14 | 2000-05-31 | Assembly Technology & Test Lim | Monitoring equipment |
DE10031203C2 (en) * | 2000-06-27 | 2002-06-27 | Siemens Ag | Method and device for leak testing of injection valves |
JP4305805B2 (en) * | 2001-04-27 | 2009-07-29 | 株式会社デンソー | Injection quantity measuring device |
DE10150786C2 (en) * | 2001-10-15 | 2003-08-07 | Siemens Ag | Method and device for automatically adjusting injectors |
DE10224258B4 (en) * | 2002-05-31 | 2007-02-01 | Robert Bosch Gmbh | Method for limiting the maximum injection pressure at solenoid-controlled, cam-driven injection components |
DE10240880B4 (en) * | 2002-09-04 | 2016-12-01 | Robert Bosch Gmbh | Actuator connection to fuel injectors of internal combustion engines |
DE10312087A1 (en) * | 2003-03-19 | 2004-10-07 | Daimlerchrysler Ag | Method for functional testing of a hydraulic valve and test stand for carrying out the method |
GB0325184D0 (en) * | 2003-10-28 | 2003-12-03 | Dt Assembly & Test Europ Ltd | An automotive fuel injector leakage tester |
DK177454B1 (en) * | 2011-11-09 | 2013-06-17 | Iop Marine As | A method for testing a gas injection valve and a plant for carrying out the method |
DK177530B1 (en) | 2012-02-22 | 2013-09-08 | Iop Marine As | A method for testing a gas shut-down valve and a plant for carrying out the method |
CN105257448B (en) * | 2015-10-06 | 2017-07-14 | 北京工业大学 | A kind of diesel engine high-pressure fuel system cone valve dynamic and visual realizes device and implementation method |
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 (en) * | 2020-07-14 | 2021-05-18 | 浙江大学 | Flow characteristic measuring device and method for control valve sleeve |
Family Cites Families (19)
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DE2001626A1 (en) * | 1970-01-15 | 1971-09-02 | Volkswagenwerk Ag | Internal combustion engine with an air inlet valve and a fuel injection valve |
US4254653A (en) * | 1980-01-11 | 1981-03-10 | The Bendix Corporation | Electromagnetic fuel injector calibration |
JPS5887415A (en) * | 1981-11-20 | 1983-05-25 | Nissan Motor Co Ltd | Fuel injection measuring apparatus for diesel engine |
US4402294A (en) * | 1982-01-28 | 1983-09-06 | General Motors Corporation | Fuel injection system having fuel injector calibration |
NL8403943A (en) * | 1984-12-24 | 1986-07-16 | Bronkhorst Hightech B V | DEVICE FOR CONTROLLING THE FLUID FLOW AMOUNT THROUGH A PIPE. |
JPS61258951A (en) * | 1985-05-10 | 1986-11-17 | Nippon Denso Co Ltd | Fuel injection controller for internal-combustion engine |
ES2042184T3 (en) * | 1985-12-02 | 1993-12-01 | Marco Alfredo Ganser | DEVICE FOR CONTROLLING ELECTRO-HYDRAULIC FUEL INJECTORS. |
US4798084A (en) * | 1985-12-09 | 1989-01-17 | Toyota Jidosha Kabushiki Kaisha | Measuring device for measuring a fuel injection quantity |
GB8610671D0 (en) * | 1986-05-01 | 1986-06-04 | Atomic Energy Authority Uk | Flow monitoring |
GB8823693D0 (en) * | 1988-10-08 | 1988-11-16 | Hartopp R | Injector cleaning apparatus |
US5157967A (en) * | 1991-07-31 | 1992-10-27 | Siemens Automotive L.P. | Dynamic flow calibration of a fuel injector by selective positioning of its solenoid coil |
GB9121988D0 (en) * | 1991-10-16 | 1991-11-27 | Lucas Hartridge Limited | Volumetric metering equipment |
DE4433543C1 (en) * | 1994-09-20 | 1995-12-21 | Sonplas Gmbh Planung Montage U | Adjusting and checking flow through valves |
DE4443137A1 (en) * | 1994-12-03 | 1996-06-05 | Bosch Gmbh Robert | Method for determining the spring force of a closing spring when opening a valve, in particular a fuel injector, and device for carrying out the method |
US5492099A (en) * | 1995-01-06 | 1996-02-20 | Caterpillar Inc. | Cylinder fault detection using rail pressure signal |
GB9525370D0 (en) * | 1995-12-12 | 1996-02-14 | Lucas Ind Plc | Flow sensor and fuel control system |
US5708201A (en) * | 1996-05-24 | 1998-01-13 | Pierburg Instruments, Inc. | Fuel delivery measurement system with automatic pump matching |
IT1284681B1 (en) * | 1996-07-17 | 1998-05-21 | Fiat Ricerche | CALIBRATION PROCEDURE FOR AN INJECTION SYSTEM FITTED WITH INJECTORS. |
US6021754A (en) * | 1997-12-19 | 2000-02-08 | Caterpillar Inc. | Method and apparatus for dynamically calibrating a fuel injector |
-
1996
- 1996-11-25 DE DE19648689A patent/DE19648689A1/en not_active Withdrawn
-
1997
- 1997-09-17 JP JP52411398A patent/JP4083230B2/en not_active Expired - Fee Related
- 1997-09-17 CN CNB971917213A patent/CN1147766C/en not_active Expired - Fee Related
- 1997-09-17 DE DE59701133T patent/DE59701133D1/en not_active Expired - Fee Related
- 1997-09-17 US US09/117,152 patent/US6311553B1/en not_active Expired - Fee Related
- 1997-09-17 KR KR10-1998-0705642A patent/KR100504414B1/en not_active IP Right Cessation
- 1997-09-17 WO PCT/DE1997/002081 patent/WO1998024014A1/en active IP Right Grant
- 1997-09-17 EP EP97909134A patent/EP0880732B1/en not_active Expired - Lifetime
- 1997-09-17 ES ES97909134T patent/ES2143853T3/en not_active Expired - Lifetime
- 1997-09-17 RU RU98115843/06A patent/RU2189488C2/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9824014A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1998024014A1 (en) | 1998-06-04 |
DE59701133D1 (en) | 2000-03-23 |
KR19990081928A (en) | 1999-11-15 |
US6311553B1 (en) | 2001-11-06 |
KR100504414B1 (en) | 2005-10-31 |
DE19648689A1 (en) | 1998-05-28 |
RU2189488C2 (en) | 2002-09-20 |
JP4083230B2 (en) | 2008-04-30 |
JP2000504389A (en) | 2000-04-11 |
EP0880732B1 (en) | 2000-02-16 |
ES2143853T3 (en) | 2000-05-16 |
CN1147766C (en) | 2004-04-28 |
CN1208476A (en) | 1999-02-17 |
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