EP0997635A2 - Procédé d'essai d'un point d'étranglement, notamment un point d'étranglement d'un injecteur - Google Patents
Procédé d'essai d'un point d'étranglement, notamment un point d'étranglement d'un injecteur Download PDFInfo
- Publication number
- EP0997635A2 EP0997635A2 EP99121321A EP99121321A EP0997635A2 EP 0997635 A2 EP0997635 A2 EP 0997635A2 EP 99121321 A EP99121321 A EP 99121321A EP 99121321 A EP99121321 A EP 99121321A EP 0997635 A2 EP0997635 A2 EP 0997635A2
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- EP
- European Patent Office
- Prior art keywords
- determined
- pressure level
- parameter
- detected
- operating point
- 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.)
- Withdrawn
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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 for testing a throttle point, in particular the Throttle point of an injector on a test bench.
- the injector is used by one Pump applied with a first constant pressure level on the primary side. In addition becomes the volume flow of the hydraulic pressure medium provided by the pump detected.
- the invention lies in that The task is to develop this further.
- a first solution according to the invention is that a first and another Operating points are determined, the first operating point being a significant one Characteristic field determined.
- the other operating points become the characteristic field assigned which is a range of permissible and non-permissible operating points having. Then, based on the position of the other operating points in the characteristic field a positive or negative test result can be detected.
- both the first and the further Operating points are largely determined by a first and second parameter.
- the first parameter is calculated from the first pressure level on the primary side and a second, predeterminable secondary pressure level of the injector.
- the second The parameter is largely determined by the measured volume flow and the first and second Pressure level determined.
- the other operating points largely determined by the increase in the second pressure level.
- the method according to the invention is a dynamic measuring method. Starting from the first operating point, the other operating points are iterated over the Increasing the secondary pressure level determined. Since the injector under dynamic aspects is checked, is therefore a clear statement about the dynamic behavior of the same injector in active operation, d. H. after installation in the Internal combustion engine, possible. By determining the first and second parameters can be a clear statement about the flow geometry within the tested Meet the injector. Under flow geometry in the sense of the invention is the degree of Rounding a throttle point, its quality to understand. With the invention In general, the process can be used to produce a throttle body assign different grades. The following are relevant for an injector Throttling points available: control throttle such as inlet and outlet throttles as well Injector itself.
- the test method is carried out until the first parameter is equal to a limit.
- the limit is chosen so that the flow of the injector remains in the stable range.
- a negative Test result is detected when an operating point falls within the impermissible range of the Characteristic field is assigned.
- a is not permissible operating point counted in a total memory. Only when the content of the Total memory exceeds a limit value, a negative test result is detected, d. H. the injector is faulty.
- the advantage of this configuration is that the tolerance of the electrode is also taken into account.
- a second solution to the problem of the invention is that a first and second operating point can be determined, a deviation from the first and second Operating point is determined and then a negative test result is detected if the deviation exceeds a limit.
- This will be the first and second Operating point as described above depending on the first and second parameters certainly.
- This two-point test method offers the advantage that a larger number of Injectors can be evaluated within a certain time.
- the second parameter K2 is calculated from the measured volume flow Q and the first p1 and second pressure level p2.
- This second parameter K2 describes completely generally the area actually flowed through in a throttle point, which the injector represents.
- This second parameter K2 can be analyzed analytically using the Bernoulli equation be calculated. As is known, the area flowed through is proportional to that Volume flow and inversely proportional to the pressure difference between the first p1 and second p2 pressure level.
- a first operating point B (1) is determined. This first operating point is determined from the first parameter K1 and the second parameter K2. In Figure 1 corresponding to the two points K1 (1) and K2 (1).
- the first operating point B (1) largely determines the characteristic field here. In other words: the first operating point B (1) serves as a reference point for all further operating points B (i). This is shown in FIG. 1 as a changeable baseline, corresponding to the route K2 (1) and B (1), arrows I and II.
- another operating point is determined by the second pressure level p2 by a predeterminable value dp, z. B. 1 bar is increased.
- This further operating point designated B (i) in FIG. 1, is then assigned to the characteristic field.
- the abscissa value K1 (i) and the ordinate value K2 (i) belong to this operating point B (i).
- this further operating point B (i) lies in the permissible range of the characteristic field.
- the test procedure is ended when the first parameter K1 is equal to a limit value GW.
- This limit value GW is shown on the abscissa in FIG.
- the limit value GW is selected so that an error-free statement about the flow conditions can still be made. In other words, values of K1 between the origin and this limit value GW are not determined because this would describe an unstable flow state.
- the injector measured is determined to be faulty, ie a negative test result is detected.
- the method can also be carried out in such a way that a negative test result is only detected when a certain number of operating points lie outside the permissible range.
- this can be carried out so that the complete characteristic curve is detected for a faulty injector.
- Figure 1 for. B. such a characteristic curve not in the permissible range is shown with the points DEB (1).
- the inventive method can be carried out so that the number of Injectors with a negative test result can be counted. In this way it can be determined whether the manufacturing process of the injectors is defective overall. It can be thus carry out a so-called "100% test".
- FIG. 2 shows a program flow chart for the first solution according to the invention.
- the first pressure level p1 is then set, e.g. B. 100 bar.
- a second pressure level p2 (1) is set. The starting value of this second pressure level is z. B. 1 bar, ie atmospheric pressure.
- the volume flow Q (1) which is established is then measured.
- step S6 the second parameter K2 (1) is determined. This results from the measured volume flow Q (1) and the first p1 and second p2 pressure level. Based this first K1 (1) and second parameter K2 (1) then becomes the first operating point B (1) determined.
- step S8 it is checked whether the operating point B (i) in the permissible range. The first time the loop is run, this request is always positive, since the first operating point B (1) serves as the base point. It is then checked in step S9 whether the first parameter K1 (1) is equal to the limit value GW according to FIG. 1. Since this is the first Pass is not yet the case, the query result is negative.
- the program branches then to step S10, in which the count variable i is incremented.
- step S11 the second pressure level p2 (1) by a predeterminable value dp, z. B. 1 bar increased. Herewith is the loop closed.
- step S8 is the further one Operating point B (i) is not within the permissible range
- the program branches to the point B. This branch is described in connection with Figures 3 A to 3 C. Becomes determined in step S9 that the first parameter K1 (i) is equal to the limit value GW, so the injector is evaluated as error-free in step S12. It will be a positive test result detected.
- the program sequence is now finished.
- FIGS. 3A to 3C Three alternative subroutines are shown in FIGS. 3A to 3C. These subroutines are activated when an operating point B (i) lies in the inadmissible range during the program run according to FIG. 2 in step S8.
- the injector is then immediately recognized as faulty in step S13 and a negative test result is detected.
- the program sequence is then ended.
- a sum memory SUM is increased by 1 in step S14.
- the number of operating points in the inadmissible range of the characteristic field is counted in this total memory.
- step S15 it is then checked whether the content of the sum memory SUM is less than a limit value GW.
- step S15 If the result of the query is positive, ie the number of inadmissible operating points B (i) has not yet exceeded the limit value GW, the program branches to point C in the program flow chart of FIG. 2. If the result of the query is negative in step S15, the injector becomes defective in step S16 determined and a negative test result detected. The program sequence is then ended.
- FIG. 3C shows a third alternative, which has the identical steps S14, S15 and S16 according to FIG. 3B contains.
- a result memory is stored in step S17 N incremented. This result memory N counts the faulty injectors. After that In step S18, it is checked whether the number of faulty injectors exceeds a limit GW is. If this is not the case, the program flow branches to point A of the Program flow chart of Figure 2. If the result of the query is positive, i. H. the number of faulty injectors is greater than the limit value GW, this becomes in step S19 Manufacturing process determined as defective. The program sequence is then ended.
- FIG. 4 shows a program flow chart of the second solution according to the invention.
- Steps S1 to S7 correspond to the same steps from FIG. 2, so that there is no further description at this point.
- step S8 it is checked whether the run variable i is 2. This is not the case during the first program run, so that the program continues at step S9 and the run variable i is increased by 1.
- step S10 the second pressure level p2 (i) is increased by a predeterminable value dp.
- the loop is hereby closed, ie the program continues with step S3.
- the second operating point B2 is determined during the second program run. Since the check at step S8 shows that the running variable i is equal to 2, the process continues with step S11.
- step S11 the deviation from the first B1 to the second B2 operating point is determined. This can be done by forming a difference or by forming a quotient.
- step S12 it is checked whether the deviation dB is greater than a limit value GW.
- the limit value dB in FIG. 1 can correspond, for example, to the difference between the two ordinate values K2 (1) and point A. A value of 1, 2 has proven itself in practice. If this is not the case, the injector is assessed as error-free in step S13 and a positive test result is detected. If the test in step S12 shows that the deviation dB is greater than the limit value GW, the injector is determined as faulty in step S14 and a negative test result is detected. The program flow chart is then ended.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Measuring Volume Flow (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1998150221 DE19850221C1 (de) | 1998-10-31 | 1998-10-31 | Verfahren zum Prüfen einer Drosselstelle, insbesondere einer Drosselstelle eines Injektors |
| DE19850221 | 1998-10-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0997635A2 true EP0997635A2 (fr) | 2000-05-03 |
| EP0997635A3 EP0997635A3 (fr) | 2002-04-10 |
Family
ID=7886251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99121321A Withdrawn EP0997635A3 (fr) | 1998-10-31 | 1999-10-26 | Procédé d'essai d'un point d'étranglement, notamment un point d'étranglement d'un injecteur |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0997635A3 (fr) |
| DE (1) | DE19850221C1 (fr) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10115924A1 (de) * | 2001-03-30 | 2002-10-24 | Bosch Gmbh Robert | Prüfstand zur Ermittlung von Drücken an druckbeaufschlagten Bauteilen |
| DE10133357C1 (de) * | 2001-07-13 | 2003-03-13 | Mtu Friedrichshafen Gmbh | Steuer- und Regelverfahren für eine Brennkraftmaschine |
| DE102004006896A1 (de) | 2004-02-12 | 2005-09-15 | Mtu Friedrichshafen Gmbh | Verfahren zur Steuerung und Regelung einer Brennkraftmaschine |
| DE102006034514B4 (de) * | 2006-07-26 | 2014-01-16 | Mtu Friedrichshafen Gmbh | Verfahren zur Steuerung einer Brennkraftmaschine |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2293725A (en) * | 1941-03-29 | 1942-08-25 | Ernest F Flock | Orifice comparator |
| DE2630521C3 (de) * | 1976-07-07 | 1981-12-10 | Volkswagenwerk Ag, 3180 Wolfsburg | Fließbank |
| DE3128072A1 (de) * | 1980-11-08 | 1982-06-24 | Robert Bosch Gmbh, 7000 Stuttgart | Pruefstand zum pruefen von einspritzduesen |
| DE3217111C2 (de) * | 1982-05-07 | 1985-01-03 | Pierburg Gmbh & Co Kg, 4040 Neuss | Verfahren zum Prüfen und/oder Einstellen von querschnittsveränderbaren Drosselstellen sowie Vorrichtung zum Durchführen dieses Verfahrens |
| US5373449A (en) * | 1988-08-13 | 1994-12-13 | Amchem Company Limited | Method of producing a multi-apertured workpiece |
| DE19632339A1 (de) * | 1996-08-10 | 1998-02-12 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Überwachung eines Durchflußbegrenzers eines Kraftstoffzumeßsystems einer Brennkraftmaschine |
-
1998
- 1998-10-31 DE DE1998150221 patent/DE19850221C1/de not_active Expired - Fee Related
-
1999
- 1999-10-26 EP EP99121321A patent/EP0997635A3/fr not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| DE19850221C1 (de) | 2000-05-04 |
| EP0997635A3 (fr) | 2002-04-10 |
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