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
  • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
  • F02M59/20—Varying fuel delivery in quantity or timing
  • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
• • 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
  • F02D41/3809—Common rail control systems
  • F02D41/3836—Controlling the fuel pressure
  • F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
  • F02D41/3854—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped with elements in the low pressure part, e.g. low pressure pump
• • 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
  • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
  • F02M37/0047—Layout or arrangement of systems for feeding fuel
  • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
• • 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
  • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
  • F02M37/04—Feeding by means of driven 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
  • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
  • F02M59/20—Varying fuel delivery in quantity or timing
  • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
• • 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
  • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
  • F02M59/20—Varying fuel delivery in quantity or timing
  • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
  • F02M59/366—Valves being actuated electrically
• • 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
  • F02M63/0205—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 for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
  • F02M63/0215—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 for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine by draining or closing fuel conduits
• • 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
  • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
  • F02M37/04—Feeding by means of driven pumps
  • F02M37/041—Arrangements for driving gear-type pumps

Definitions

• the invention is based on a fuel injection device according to the preamble of claim 1.
• the prefeed pump is designed as an external gear pump and is driven via the drive shaft of the high-pressure pump, wherein the amount of fuel supplied to the high-pressure pump is regulated via a separate metering unit.
• a safety valve is provided, which prevents a break in the pipe or the filter in the event of overpressure, and a venting valve for venting the delivery pipe.
• the delivery rate is controlled via a differential quantity valve which at the same time also assumes the safety function and ventilation function.
• the differential quantity valve is arranged, for example, in front of a pressure-side fuel filter.
• the known volume control by means of a metering unit according to the invention can be switched to an example quantity-controlled electric prefeed pump (eg gear pump).
• Advantage of this solution according to the invention is the same quality as in a regulated electric fuel pump, but safety and ventilation valves are saved, especially since the differential valve has the same expense as a metering unit.
• the single FIGURE shows an embodiment of the fuel injection device according to the invention.
• the fuel injector 10 for an internal combustion engine shown in the figure includes a fuel tank 11, a high-pressure fuel pump 12, and a fuel feed pump (eg, gear pump) 13 having a controlled electric drive 13a and fuel from the fuel tank 11 to the high-pressure pump 12 promotes.
• the high-pressure pump 12 conveys fuel under high pressure into a high-pressure accumulator ("common rail") 14, to which in turn fuel injection valves (injectors) 15 are connected, which inject the fuel into the combustion chamber of the internal combustion engine regulated, which is connected to a leading back into the fuel tank 1 1 fuel return line 17.
• the prefeed pump 3 is controlled by the pressure prevailing in its pressure-side conveying line 18 fuel pressure (discharge pressure) or on the delivered amount of fuel (flow rate.)
• fuel pressure discharge pressure
• flow rate flow rate
• the pressure or quantity-controlled prefeed pump 13 regulates the conveyed total fuel quantity A, which is forced through the filter 19.
• filter 19 and high-pressure pump 12 passes from the pressure-side counsellei Device 18 from a purge line 20, whereby the filtered fuel amount is divided into a flow rate B and a purge amount C.
• the flow B is from the High-pressure pump 2 is conveyed under high pressure into the high-pressure accumulator 14, while the purge amount C is used to rinse the high-pressure pump 12 and is guided back into the fuel tank 1 1 via the fuel return line 17.
• the exact total amount A through the filter 19 is controlled by a differential quantity valve 21 with an adjustable valve cross-section, through which the pressure-side delivery line 18 between pre-feed pump 13 and filter 19 is connected to the return line 17.
• the differential quantity valve 21 is electrically actuated, for example, via an accelerator pedal 22 and, in the exemplary embodiment shown, is designed as a magnetic valve with a magnetic drive 23 which actuates the valve closing element (ball) 24 of the differential quantity valve 21 and thus adjusts the valve cross section.
• the valve closing element 24 is biased in the closing direction via a closing spring 25 and is automatically opened independently of the magnetic drive 23 if the pressure prevailing in the pressure-side conveying line 18 is sufficient to control the valve closing element 24 against the action of the closing spring 25.
• the differential quantity valve 21 thus opens at an overpressure in the pressure-side delivery line 18, e.g. due to a clogged filter 19, and thus takes over the safety function of a pressure relief valve.
• the differential quantity valve 21 can be opened electrically for venting and consequently also takes over the venting function of a venting device not shown here in detail. Separate safety and ventilation valves are not required.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Fuel-Injection Apparatus (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=43014928

Family Applications (1)

Country Status (5)

Cited By (3)

Families Citing this family (2)

Citations (4)

Family Cites Families (1)

• 2009
  • 2009-12-02 DE DE200910047376 patent/DE102009047376A1/de not_active Withdrawn
• 2010
  • 2010-10-04 WO PCT/EP2010/064710 patent/WO2011067008A1/de active Application Filing
  • 2010-10-04 EP EP10761005.7A patent/EP2507503B1/de not_active Not-in-force
  • 2010-10-04 CN CN201080054550.1A patent/CN102770658B/zh not_active Expired - Fee Related
• 2012
  • 2012-04-03 IN IN2867DEN2012 patent/IN2012DN02867A/en unknown

Patent Citations (4)

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