WO2006015893A1 - Prüfverfahren - Google Patents
Prüfverfahren Download PDFInfo
- Publication number
- WO2006015893A1 WO2006015893A1 PCT/EP2005/052705 EP2005052705W WO2006015893A1 WO 2006015893 A1 WO2006015893 A1 WO 2006015893A1 EP 2005052705 W EP2005052705 W EP 2005052705W WO 2006015893 A1 WO2006015893 A1 WO 2006015893A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- fuel
- pump
- rail
- valve
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
Definitions
- the invention relates to a method for testing the function of a high pressure pump with several Pumpen ⁇ elements, each of which limit a working space, which can be sucked through a suction valve with a Niederbuchbe ⁇ rich, from the fuel, and is connected via a pressure valve with a high pressure area comprising a zentra ⁇ len fuel high-pressure accumulator (rail) serving to Kraftstoffver ⁇ supply of an internal combustion engine, in which the high-pressure pump delivers the fuel sucked from the Niederbuchbe- rich and the pressure of which is detected by a rail pressure sensor.
- the high-pressure pump is removed from the internal combustion engine and tested on a special test bench.
- the object of the invention is to provide a method for testing the function of a high-pressure pump with several pump elements, each delimiting a working space which can be sucked from the fuel via a suction valve with a low-pressure region, and via a pressure valve a high-pressure area is connected, which comprises a central fuel high-pressure accumulator (rail) which serves to supply fuel to an internal combustion engine, into which the high-pressure pump delivers the fuel drawn in from the low-pressure region and its pressure is detected by a rail pressure sensor to provide, which is simple and characterizedgüns ⁇ tiger feasible and still allows a reliable statement about the functioning of the high-pressure pump.
- the object is in a method for testing the function of a high pressure pump with several Pumpen ⁇ elements, each of which limit a working space, which can be sucked rich from a suction valve with a Niederbuchbe ⁇ , from the fuel, and via a pressure valve with a high pressure area in combination which comprises a zentra ⁇ len fuel high-pressure accumulator (Rail) serving to Kraftstoffver ⁇ an internal combustion engine, in which the high-pressure pump delivers rich from the Niederbuchbe ⁇ rich fuel and its pressure is detected by a rail pressure sensor, da solved by that of In the installed state of the high-pressure pump, values recorded in the rail pressure sensor are used to check the function of the high-pressure pump during operation of the internal combustion engine. As a result, the expansion of the high-pressure pump and the special test stand can be dispensed with.
- a rail pressure sensor da solved by that of In the installed state of the high-pressure pump, values recorded in the rail pressure sensor are used to check the function of the high-pressure pump during operation of the internal combustion engine.
- a preferred embodiment of the method is characterized in that an adapter device is connected to the rail pressure sensor in order to transmit the detected pressure values to an external evaluation unit.
- the adapter device is, for example, an intermediate plug with an interface for a connection. connection cable, in particular an oscilloscope cable.
- the evaluation unit is preferably an oscilloscope or a test device with oscilloscope function. It is also possible to use a control unit integrated in the internal combustion engine.
- test takes place in the idle mode of the internal combustion engine.
- the test can also be carried out in other defined operating states of the internal combustion engine. However, clear tests were achieved during the test at idle in the context of the present invention.
- a further preferred embodiment of the method is characterized in that the raw signal des.'Raildrucksensors is used as the measured value for the rail pressure.
- the signal of the rail pressure sensor can only be used to a limited extent from a control device belonging to the internal combustion engine for checking the function of the high-pressure pump. Significantly better results were achieved with the raw signal of the rail pressure sensor, in particular with larger ratios between the pump speed and the engine speed.
- a further preferred exemplary embodiment of the method is characterized in that a pressure regulating valve with which the high-pressure pump is equipped is opened in order to increase the delivery rate of the high-pressure pump.
- the pressure regulating valve releases a connection between the high-pressure region and the low-pressure region.
- the targeted opening of the pressure control valve artificially increases the delivery rate of the high-pressure pump.
- a further preferred exemplary embodiment of the method is characterized in that the delivery rate of the high-pressure pump is increased by opening a pressure-limiting valve with which the high-pressure fuel accumulator is equipped.
- the pressure limiting valve is closed during normal operation of the internal combustion engine and opens only when a maximum permissible pressure of, for example, 1,800 bar in the high-pressure fuel accumulator is exceeded. Then the pressure limiting valve reduces the pressure in the high-pressure fuel accumulator to a lower value of, for example, 800 bar in order to enable emergency driving operation.
- the targeted opening of the pressure relief valve, the randomly ⁇ amount of high-pressure pump is artificially increased.
- a further preferred embodiment of the method is characterized in that a metering unit, which is connected upstream of the high-pressure pump, is opened in order to increase the delivery rate of the high-pressure pump until the pressure-limiting valve is opened. More fuel is supplied via the open metering unit to the preferably suction-throttled high-pressure pump than is required, for example, during idling operation of the internal combustion engine. The artificially increased flow rate eventually causes the pressure relief valve opens.
- Figure 1 is a schematic representation of a fuel injection system with a high pressure pump having a pressure control valve
- Figure 2 is a schematic representation of a fuel injection system with a high-pressure pump, which is connected upstream of a metering unit;
- FIG. 3 shows a plot of the voltage of a rail pressure sensor over time in the case of an inactive high-pressure pump
- FIG. 4 shows a plot of the voltage of the rail pressure sensor over time in the case of a defective suction valve
- FIG. 5 shows a plot of the voltage of the rail pressure sensor over time in the case of a defective pressure valve
- FIG. 6 shows a plot of the voltage of the rail pressure sensor over time with a pressure relief valve open and an intact high-pressure pump
- FIG. 7 shows a plot of the voltage of the rail pressure sensor over time with the pressure relief valve open and with a defective suction valve
- FIG. 8 shows a plot of the voltage of the rail pressure sensor over time with the pressure relief valve open and a defective pressure valve.
- a common rail fuel injection system is shown schematically.
- a low-pressure vessel 1 which is also referred to as a fuel tank
- fuel is conveyed to a high-pressure pump 4 by means of a fuel feed pump 2 via a connecting line 3.
- an overflow valve 6 is arranged an ⁇ .
- the low-pressure container 1, the fuel pump 2 and the connecting line 3 are subjected to low pressure and are therefore assigned to the low-pressure region.
- a pressure control valve 8 is attached, which is connected via a line 9 to the Nieder ⁇ pressure vessel 1.
- the high-pressure pump 4 starts a high-pressure line 10, which supplies the high-pressure fuel to a high-pressure fuel accumulator 12, which is also referred to as a common rail.
- high-pressure lines 14 which supply the high-pressure fuel from the high-pressure accumulator 12 to injection valves 15, which are also designated as injectors, and from those in FIG For clarity, only one is shown.
- the high-pressure line 10, the high-pressure accumulator 12, the high-pressure line 14 and the injection valve 15 contain high-pressure fuel and are therefore assigned to the high-pressure region of the fuel injection system.
- a pressure-holding valve 18 is connected between the two sections 16 and 17 of the return line.
- the pressure-retaining valve 18 serves to maintain a minimum pressure of approximately 1.0 bar in the section 16 of the return line.
- the operation of the fuel injection system is controlled by an electronic control unit 19.
- FIG. 2 shows a similar fuel injection system as shown in FIG.
- the fuel injection system comprises a high-pressure pump 20, which is driven by a drive shaft 21 having an eccentric shaft portion 22. At the eccentric shaft portion 22, the ends of three star-shaped pistons 24, 25 and 26 are in abutment. The ends of the pistons 24 to 26 facing away from the drive shaft 21 define working spaces 28, 29 and 30, which are also referred to as pump chambers.
- the work spaces 28 to 30 are in each case via a suction valve 32, 33 and 34 with the interposition of a metering unit 36 with a low pressure region 38 in connection.
- the working chambers 28 to 30 are connected via pressure valves 40 to 42 to a high-pressure fuel accumulator 44, which is also referred to as common rail or short rail.
- a high-pressure fuel accumulator 44 which is also referred to as common rail or short rail.
- high-pressure lines 46 to 49 lead to fuel injection valves (not shown).
- the high-pressure fuel storage 44 is connected via a pressure relief valve 52 to the low pressure region 38 in connection.
- a rail pressure sensor 55 via which the pressure in the high-pressure fuel accumulator 44 is detected, is mounted on the high-pressure fuel accumulator 44.
- the high-pressure pump 20 serves to convey fuel from the low-pressure region 38 into the high pressure accumulator 44.
- the suction valves 32 to 34 When sucking open the suction valves 32 to 34, whereas the Druckven ⁇ tile 40 to 42 are closed. Via the metering unit 36, the delivery rate of the high-pressure pump 20 can be controlled.
- the suction valves 32 to 34 When pumping fuel into the high-pressure fuel storage 44, the suction valves 32 to 34 closed and the pressure valves 40 to 42 open.
- a dot-dash line 58 it is indicated that the metering unit 36, the suction valves 32 to 34 and the pressure valves 40 to 42 are integrated into the high-pressure pump 20.
- the high-pressure pump is tested during idling operation of the vehicle without access to the control unit integrated into the vehicle, without the high-pressure pump being removed from the vehicle.
- the encouragenförde ⁇ tion of the high-pressure pump is artificially increased during testing by either the pressure relief valve 52 (see Figure 2) or the pressure control valve 8 (see Figure 1) is opened.
- the pressure control valve must be constantly energized or umgeschal ⁇ tet on a pressure control with pressure control valve. Switching to the pressure control valve control can take place automatically when the metering unit is unplugged. This makes it possible to assess the function of suction and pressure valves separately, as will be explained below. It is also possible to automate the course of the test with the aid of suitable software functions.
- a rail pressure sensor cable adapter is used as an intermediate plug with a tap for an oscilloscope cable.
- An oscilloscope is used to evaluate the signals from the rail pressure sensor.
- an oscilloscope function of an existing test device can be used.
- the inventive method works as follows: The engine is idling. The rail pressure sensor cable adapter is plugged in. In a first measurement, the pressure limiting valve is closed. The engine runs at 600 rpm. The transmission ratio between the pump speed and the engine speed is 5: 3. As a result, the high-pressure pump runs at 1,000 rpm. 1,000 rpm correspond to 16.66 U / sec.
- a characteristic rail pressure oscillation occurs at 16.66 U / sec.
- the frequency of this vibration is independent of whether a suction valve or a pressure valve is defective.
- the associated period is 0.06 seconds.
- the rail pressure is measured synchronously with injection, that is, shortly before each injection. Every second revolution is injected. With six cylinders, this results in five injections per second for each cylinder, ie thirty injections per second. That's 30 Hz or 0.033 seconds.
- the vibration on the rail pressure sensor signal from the integrated into the engine control unit can be detected only insufficient. In addition, the signal in the control unit is filtered again.
- the raw signal of the rail pressure sensor is used as the measured value for the rail pressure and not the signal from the vehicle-integrated control unit.
- the raw signal of the rail pressure sensor is plotted in volts over time in seconds.
- the injection quantity is set to 10 mg.
- the pressure relief valve is closed.
- the raw signal of the rail pressure sensor has a relatively constant value of approximately 1.4 volts over the considered period of time. The rail pressure is therefore stable.
- ⁇ f is the raw signal from the rail pressure sensor to the time shown, when a pressure valve is de ⁇ fect.
- the raw signal of the rail pressure sensor fluctuates approximately between 1.3 and 1.5 volts.
- the oscillation occurs because the de ⁇ Maschinen pressure valve does not close.
- a certain amount is conveyed into the high-pressure fuel accumulator in the delivery stroke of the associated piston.
- this quantity is sucked in again in the following intake stroke of the piston via the defective pressure valve.
- a certain amount of fuel in the high pressure region is maro ⁇ ben, resulting in the vibration shown in Figure 5.
- the engine is still idling.
- a special function of the control unit opens the metering unit to increase the flow rate.
- the increased flow rate causes the pressure relief valve opens. The same effect is achieved if a pressure regulating valve on the high pressure pump is opened in the low pressure range.
- the raw signal of the rail pressure sensor is plotted over time when a pressure valve is defective. Again, a vibration of the same frequency occurs.
- a comparison of two pumping operations with ge opened and closed pressure relief valve can be determined whether a suction or pressure valve is defective in the high-pressure pump.
- the test method according to the invention can be suspected On a defective high-pressure pump, the function of promoting all pump elements tested and thus indirectly the metering unit be excluded as a cause of failure.
- an equal promotion of the pump can be detected by suction valves with different opening pressures, since the different opening pressures lead to a similar oscillation behavior.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007524308A JP4605812B2 (ja) | 2004-08-05 | 2005-06-13 | 検査法 |
US11/659,358 US7775102B2 (en) | 2004-08-05 | 2005-06-13 | Method for testing a high-pressure pump in a fuel system |
EP05756927.9A EP1776520B1 (de) | 2004-08-05 | 2005-06-13 | Prüfverfahren |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004037963.7 | 2004-08-05 | ||
DE102004037963A DE102004037963A1 (de) | 2004-08-05 | 2004-08-05 | Prüfverfahren |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006015893A1 true WO2006015893A1 (de) | 2006-02-16 |
Family
ID=34971561
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2005/052705 WO2006015893A1 (de) | 2004-08-05 | 2005-06-13 | Prüfverfahren |
Country Status (5)
Country | Link |
---|---|
US (1) | US7775102B2 (de) |
EP (1) | EP1776520B1 (de) |
JP (1) | JP4605812B2 (de) |
DE (1) | DE102004037963A1 (de) |
WO (1) | WO2006015893A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107448315A (zh) * | 2009-10-23 | 2017-12-08 | Mtu 腓特烈港有限责任公司 | 用于控制和调节内燃机的方法 |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006007989A1 (de) * | 2006-02-21 | 2007-08-30 | Robert Bosch Gmbh | Elektrischer Stecker mit abgedichteten Metalleinlegeteilen |
DE102007032740B4 (de) * | 2007-07-13 | 2021-05-20 | Robert Bosch Gmbh | Adapter zur Druckmessung |
US8776617B2 (en) | 2011-04-11 | 2014-07-15 | Gicon Pump & Equipment, Ltd. | Method and system of submersible pump and motor performance testing |
US9222477B2 (en) | 2011-04-11 | 2015-12-29 | Gicon Pump & Equipment, Ltd. | Method and system of submersible pump and motor performance testing |
CN102901650B (zh) * | 2012-10-16 | 2015-12-09 | 武汉船用机械有限责任公司 | 一种货油***的测试装置和方法 |
US10094320B2 (en) * | 2015-06-23 | 2018-10-09 | Ford Global Technologies, Llc | Methods and systems for dual fuel injection |
GB2550599B (en) * | 2016-05-24 | 2020-05-27 | Delphi Tech Ip Ltd | Method of controlling fuel injection test equipment |
US10030619B2 (en) | 2016-07-07 | 2018-07-24 | Caterpillar Inc. | Connector for mounting sensor in pressurized fluid system |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1136686A2 (de) * | 2000-03-23 | 2001-09-26 | Toyota Jidosha Kabushiki Kaisha | Einrichtung zur Regelung des Kraftstoffdrucks einer Brennkraftmaschine |
DE10254464A1 (de) * | 2001-11-22 | 2003-07-10 | Denso Corp | Kraftstoffeinspritzsystem mit gemeinsamer Leitung |
WO2004036034A1 (de) * | 2002-10-11 | 2004-04-29 | Robert Bosch Gmbh | Verfahren zum betreiben eines common-rail-kraftstoffeinspritzsystems für brennkraftmaschinen |
EP1441120A2 (de) * | 2003-01-27 | 2004-07-28 | Denso Corporation | Druckspeicherkraftstoffeinspritzvorrichtung |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5359883A (en) * | 1993-08-16 | 1994-11-01 | Caterpillar Inc. | Apparatus and method for analyzing events for an internal combustion engine |
IT1261575B (it) | 1993-09-03 | 1996-05-23 | Fiat Ricerche | Metodo di diagnosi di malfunzionamenti del circuito ad alta pressione di impianti di iniezione ad alta pressione per motori a combustione interna |
DE10036772C2 (de) | 2000-07-28 | 2003-02-06 | Bosch Gmbh Robert | Verfahren zum Betreiben eines Kraftstoffzumesssystems einer direkteinspritzenden Brennkraftmaschine |
JP2004084538A (ja) | 2002-08-26 | 2004-03-18 | Denso Corp | コモンレール式燃料噴射システム |
CN1571415A (zh) * | 2003-07-17 | 2005-01-26 | 华为技术有限公司 | 一种封装数据流的方法 |
-
2004
- 2004-08-05 DE DE102004037963A patent/DE102004037963A1/de not_active Withdrawn
-
2005
- 2005-06-13 US US11/659,358 patent/US7775102B2/en not_active Expired - Fee Related
- 2005-06-13 EP EP05756927.9A patent/EP1776520B1/de not_active Expired - Fee Related
- 2005-06-13 WO PCT/EP2005/052705 patent/WO2006015893A1/de active Application Filing
- 2005-06-13 JP JP2007524308A patent/JP4605812B2/ja not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1136686A2 (de) * | 2000-03-23 | 2001-09-26 | Toyota Jidosha Kabushiki Kaisha | Einrichtung zur Regelung des Kraftstoffdrucks einer Brennkraftmaschine |
DE10254464A1 (de) * | 2001-11-22 | 2003-07-10 | Denso Corp | Kraftstoffeinspritzsystem mit gemeinsamer Leitung |
WO2004036034A1 (de) * | 2002-10-11 | 2004-04-29 | Robert Bosch Gmbh | Verfahren zum betreiben eines common-rail-kraftstoffeinspritzsystems für brennkraftmaschinen |
EP1441120A2 (de) * | 2003-01-27 | 2004-07-28 | Denso Corporation | Druckspeicherkraftstoffeinspritzvorrichtung |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107448315A (zh) * | 2009-10-23 | 2017-12-08 | Mtu 腓特烈港有限责任公司 | 用于控制和调节内燃机的方法 |
Also Published As
Publication number | Publication date |
---|---|
US7775102B2 (en) | 2010-08-17 |
US20070243077A1 (en) | 2007-10-18 |
DE102004037963A1 (de) | 2006-03-16 |
JP2008509315A (ja) | 2008-03-27 |
JP4605812B2 (ja) | 2011-01-05 |
EP1776520B1 (de) | 2013-05-15 |
EP1776520A1 (de) | 2007-04-25 |
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