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
• • 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
  • F02M65/002—Measuring fuel delivery of multi-cylinder injection pumps
• • 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
  • F02M65/006—Measuring or detecting fuel leakage of fuel injection apparatus
• • G—PHYSICS
  • G07—CHECKING-DEVICES
  • G07F—COIN-FREED OR LIKE APPARATUS
  • G07F19/00—Complete banking systems; Coded card-freed arrangements adapted for dispensing or receiving monies or the like and posting such transactions to existing accounts, e.g. automatic teller machines
  • G07F19/20—Automatic teller machines [ATMs]
• • G—PHYSICS
  • G07—CHECKING-DEVICES
  • G07F—COIN-FREED OR LIKE APPARATUS
  • G07F19/00—Complete banking systems; Coded card-freed arrangements adapted for dispensing or receiving monies or the like and posting such transactions to existing accounts, e.g. automatic teller machines
  • G07F19/20—Automatic teller machines [ATMs]
  • G07F19/205—Housing aspects of ATMs
• • 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
  • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
  • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
  • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails

Definitions

• the present invention relates to a test device for high pressure injectors of a common rail injection system of an engine assembly, wherein the high pressure injectors each having a fuel return port for a fuel return line.
• One possible source of error in the common-rail injection system may be a defective high-pressure injector. Such sources of error must be able to diagnose car workshops.
• the source of error or the faulty high-pressure injector can be found out by comparing the resulting fuel return quantity of the individual cylinders of an engine unit depending on manufacturer specifications at idle or in corresponding speeds among each other.
• the efficiency of a high-pressure injector may also be affected by the fact that the injection nozzle is dirty. There are known cleaning methods for contaminated high pressure injectors. However, it is not possible to immediately and quickly check the efficiency of the cleaning process or its effectiveness.
• the return line is located on the side of the nozzle.
• injectors from Delphi only one side-facing grommet is available.
• the test tube must have a relatively large volume, since the engines have to run according to the manufacturer's specifications at idle and at appropriate speeds about 1 to 3 minutes and therefore runs back a lot of fuel. Even with a possible defect of an injector nozzle flows a much larger amount of fuel back.
• the present invention Based on the cited prior art, the present invention, the object or the technical problem of specifying a test device and a method of the type mentioned above, which allows a reliable fault diagnosis, in particular by means of which the verification of the efficiency of a cleaning process is easily possible, and which can be used in a simple way in a variety of engines.
• test device according to the invention is given by the features of independent claim 1.
• Advantageous embodiments and further developments are specified in the dependent of the independent claim 1 directly or indirectly dependent claims.
• test device is accordingly characterized by a flow rate measurement / display unit which can be detachably connected between the fuel return port and the fuel return line.
• the testing device it is advantageously possible to measure the defectiveness within a circulatory system as a whole from high-pressure injectors.
• the individual high-pressure injectors of a Engine checked with each other by means of the tester with respect to the return flow of the fuel in the fuel return line. If a high-pressure injector falls outside the frame with regard to the amount of reflux, it can be concluded from the values of the other high-pressure injectors that this high-pressure injector is defective or should first be cleaned in a first step.
• the circulation of the fuel is closed, so that the possibility is opened to operate the engine for checking purposes over a longer period of time while observing or documenting any changes in the fuel return.
• test device With the test device according to the invention is also possible in a simple manner to check the efficiency of a cleaning process. First, the flow rate measuring / display unit is mounted and the flow rate is measured. So then the cleaning process is performed. Then, the return flow is measured again by means of the flow rate measurement / display unit. If the cleaning process was successful, a uniform return flow of fuel is evident. If the reflow rates do not or only insignificantly change on an injector, it can be concluded that the high-pressure injector has a defect that can not be eliminated by cleaning procedures.
• a particularly preferred embodiment is characterized in that between the fuel return port and the flow rate measurement / display unit, a first, in particular flexible, hose unit is arranged.
• a second, in particular flexible, hose unit can be arranged between the flow rate measurement / display unit and the fuel return line.
• the display unit can preferably be designed as a digital or pointing device.
• a structurally particularly simple, economically producible and permanently reliable usable test device is characterized in that the flow rate measuring / display unit is designed as a transparent hollow profile with an internally in the longitudinal direction of the hollow profile slidably arranged float.
• the hollow profile may preferably consist of glass or plastic.
• a readable scale is provided on the hollow profile.
• the flow rate measuring / display unit Depending on the size of the fuel return flow, which via the fuel return port, the flow rate measuring / display unit, the amount of flowing back into the fuel tank, causes depending on the size of a different floating of the float within the hollow profile. This makes it possible in a simple manner, especially in the presence of a mounted scale to read the D, flow rate. This embodiment is technically robust and suitable for use in rough workshop operation. In addition, reliable results are displayed.
• the method according to the invention for testing the operability of high-pressure injectors of a common-rail injection system of an engine assembly is accordingly characterized in that a flow rate measurement / display unit is detachably used for a predeterminable time interval between the fuel return port of the high-pressure injector and the fuel return portion, and Subsequently, the engine assembly is operated over predetermined time intervals, so that the amount of the returning fuel is measured and / or displayed.
• a particularly advantageous embodiment of the method according to the invention in terms of handling is characterized in that for producing a communication connection between the fuel return port of the high-pressure injector and the flow rate measurement / display unit and / or between the flow rate measurement / display unit and the fuel return line, one, in particular flexible, hose unit is detachable is connected.
• a particularly advantageous embodiment of the method according to the invention is characterized in that the flow rate measuring / display unit is used in a first time interval, then the high pressure injectors is subjected to a cleaning process and then the flow rate measurement / display unit in a second time interval is used.
• FIG. 1 is a highly schematic representation of the use of a test device with a flow rate measuring / display unit for a high pressure injector of a common rail injection system
• Fig. 2 highly schematic representation of the high-pressure injector without
• Embodiment of a flow rate measuring / display unit designed as a glass tube with plastic floating body and 4a to c highly schematic diagram of four high pressure injectors of a 4-cylinder unit with fuel circuit in the normal operating state (Fig. 4a), in the operating state when testing an injector (Fig.4b) and in the operating state when checking all four injectors (Fig. 4c).
• the supplied fuel is led up to the injection nozzle and parts of the unneeded fuel flow back. If the injection nozzle or the high-pressure injector 50 is defective or contaminated, a greatly increased amount of fuel flows back into the fuel tank 56 via a fuel return connection 52 of the high-pressure injector 50 and via a connected fuel return line 54.
• the reflux of the fuel is shown in the figures with the arrows R.
• a test device 10 which has a flow rate measurement / display unit 12.
• the fuel return line 54 is released from the fuel return port 52.
• a connection between the fuel return connection 52 and the flow rate measurement / display unit 12 is established via a first flexible hose unit 20.
• the flow rate measurement / display unit 12 is connected to the return line 54 via a second flexible hose unit 22.
• the fuel return flow rate can now be determined and displayed via the flow rate measurement / display unit 12. If the flow rate measurement is carried out before and after a cleaning Performed operation of the high-pressure injector 50, it can be determined based on the display, whether the cleaning process was successful or if there is another defect.
• the first hose unit 20 is released from the fuel return port 52 and the second hose unit 22 is released from the fuel return line 54. Subsequently, the fuel return line 54 is in turn connected via the fuel return port 52 to the high pressure injector 50.
• FIG. 12.1 A constructive embodiment of the flow rate measurement / display unit 12 is shown schematically in FIG.
• This unit 12.1 is designed as a glass tube having top and bottom terminal units 33 for the first tube unit 20 and second tube unit 22, wherein within the unit 12.1 a float body unit 14 is provided, which is longitudinally displaceable within the unit 12 and depending on the flow rate takes different positions. Furthermore, the unit 12.1 has a readable scale 16 by means of which the magnitude of the flow rate can be specified.
• This embodiment provides a commercially viable test device available that can be easily used and ensures a durable reliable function even under tough workshop conditions.
• Fig. 4 the four high-pressure injectors 50 of a 4-cylinder unit are shown, which is supplied via an injection line E from the fuel tank 56 from fuel and the fuel return line 54 in the direction R superfluous fuel back to the fuel tank 56.
• Fig. 4a shows a highly schematic without further illustration of the necessary for the operation of the engine unit control, regulating and delivery units the normal operating condition.
• Fig. 4b the state is shown, in which the left high-pressure injector 50 is checked.
• the first flexible hose unit 20 is connected via the fuel return port 52 of the high pressure injector 50, which in turn is connected to the flow rate measuring / display unit 12.
• the flow rate measurement / display unit 12 is in turn connected via a second flexible hose unit 22 to the return line 54, so that a total of in conjunction with the supply of the fuel in the injection direction E results in a fuel circuit.
• an increased compared to the normal operating condition fuel quantity flows back, which is measured or displayed on the flow rate measurement / display unit 12.
• Figure 4c illustrates the condition that all four high pressure injectors 50 are tested by means of the flow rate measurement / display unit 12, each high pressure injector 50 being located in communication with the flow rate meter / display unit 12 within a fuel flow loop.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• Finance (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Accounting & Taxation (AREA)
• Business, Economics & Management (AREA)
• Fuel-Injection Apparatus (AREA)
• Examining Or Testing Airtightness (AREA)
• Measuring Volume Flow (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (3)

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Family Applications (1)

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Cited By (1)

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• 2005
  • 2005-07-28 DE DE202005011855U patent/DE202005011855U1/de not_active Expired - Lifetime
• 2006
  • 2006-01-12 DE DE502006009213T patent/DE502006009213D1/de active Active
  • 2006-01-12 DE DE112006002615T patent/DE112006002615A5/de not_active Withdrawn
  • 2006-01-12 ES ES06705771T patent/ES2363790T3/es active Active
  • 2006-01-12 US US11/989,741 patent/US8047062B2/en active Active
  • 2006-01-12 AT AT06705771T patent/ATE503925T1/de active
  • 2006-01-12 JP JP2008523110A patent/JP5094718B2/ja active Active
  • 2006-01-12 DK DK06705771.1T patent/DK1907690T3/da active
  • 2006-01-12 EP EP06705771A patent/EP1907690B9/fr active Active
  • 2006-01-12 PL PL06705771T patent/PL1907690T3/pl unknown
  • 2006-01-12 WO PCT/DE2006/000032 patent/WO2007012298A1/fr active Application Filing

Non-Patent Citations (1)

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