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
  • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
• • 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
  • F02D41/32—Controlling fuel injection of the low 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
  • F02D41/30—Controlling fuel injection
  • F02D41/38—Controlling fuel injection of the high pressure type
  • F02D41/3809—Common rail control systems
• • 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D2200/00—Input parameters for engine control
  • F02D2200/02—Input parameters for engine control the parameters being related to the engine
  • F02D2200/06—Fuel or fuel supply system parameters
  • F02D2200/0602—Fuel pressure
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D2250/00—Engine control related to specific problems or objectives
  • F02D2250/31—Control of the fuel pressure

Definitions

• the present invention relates to a load shedding device for a high-pressure direct injection pump intended to supply gasoline to a bank of injectors of an internal combustion engine of a motor vehicle.
• the gasoline engines for motor vehicles currently developed emit into the atmosphere, among other things, large quantities of carbon dioxide (C0 2 ), or approximately 170 g of C0 2 per 100 km traveled.
• C0 2 carbon dioxide
• a second solution consists of placing injectors directly in an engine combustion chamber.
• the injector is subjected to downstream pressure variations linked to the Beau de Rochas cycle and, on the other hand, the metering of the injected petrol must be carried out very precisely.
• a high pressure injection pump associated with a pressure regulator is used to supply the injectors with high pressure fuel.
• the high pressure injection pump is a mechanical pump driven by the motor vehicle engine.
• the speed of rotation of the pump thus depends on that of the motor.
• the pressure regulator cannot therefore ensure that the engine speeds are particularly low, for example during the starting phase, a stable pressure at the injectors, which is detrimental to the good progress of the combustion.
• the object of the present invention is to remedy the drawbacks mentioned above, by providing a device making it possible to obtain a stable fuel pressure at the level of the injectors in order to reduce the fuel consumption as well as the C0 2 rate, without impair engine performance.
• Another object of the invention is to reduce the residual gasoline pressure in the injectors when the engine is stopped or when the electrical supply to a vehicle engine control system is cut.
• the present invention relates to a load shedding device of a direct high pressure injection pump intended to supply gasoline to a rail of injectors of an internal combustion engine of a motor vehicle, the high pressure pump being connected, by a supply line, to an electric low pressure booster pump, which communicates with a fuel tank, and the high pressure delivered being regulated by a pressure regulator, characterized in that the pressure regulator is a regulator three - way, a first way connecting the high pressure pump to the manifold of 1 injectors, a second way connecting the high pressure pump to the tank and the third way connecting the low pressure booster pump to the injector manifold, the second way being selectively open in normal operation, the first channel being closed when the third channel is open and vice versa in operation under power supply, the third way being:
• - track B is connected to the supply duct, downstream of the booster pump;
• the pressure delivered by the booster pump is regulated by a low pressure regulator;
• the third channel C is at least partly integrated in the three-way pressure regulator;
• the third channel C is fully integrated in the three-way pressure regulator.
• FIG. 1 shows, in schematic form, a first embodiment of the load shedding device of a high pressure direct injection pump according to the present invention
• FIG. 2 represents a second embodiment of the load shedding device according to the present invention.
• the motor vehicle on board which is intended to be installed the device according to the present invention, represented in FIG. 1, comprises, in a manner known in itself, an engine control system which includes a computer 1 which controls:
• the computer receiving information from a series of sensors 12 measuring different engine parameters such as air flow, water temperature or even air temperature, as well as a pressure sensor 13 measuring the gasoline pressure in the manifold 5 of injectors 6.
• the booster pump 11 is placed in a fuel tank 14 and is connected by a pipe 15 to the high pressure injection pump 10 to supply the latter with gasoline.
• This pump is an electric pump connected, via the computer, to a battery (not shown) of the vehicle and the initial switching on / off of which is controlled by a user of the vehicle when the latter wants to start the engine or 1 'stop.
• the pressure regulator 9 takes the form of a three-way valve mounted on the high pressure injection pump 10 or integrated into it and the first path A of which connects this high pressure pump 10 to the manifold 6 injectors 5, the second path B connects the pump 10 to the fuel tank 14 downstream of a pressure regulation device and the third path C connects the booster pump 11 to the manifold 6 of injectors 5.
• This path It is partially or fully integrated into the pressure regulator 9.
• the high pressure injection pump 10 is a mechanical pump whose operation is linked to the operation of the engine, that is to say that the number of revolutions per minute of the pump 10 is linked to the number of revolutions per minute of the engine.
• the high pressure pump 10 can supply high pressure gasoline stabilized by the pressure regulator 9 in the manifold 6 of injectors 5 only after a certain predetermined threshold linked to the number of revolutions per minute. of the motor.
• this engine rotates at a number of revolutions per minute below the predetermined threshold while, as soon as it is energized, the electric booster pump 11 supplies in line 15 of the gasoline under low pressure.
• the computer 1 then controls the closing of the first channel A and the opening of the third channel C. A bypass is thus formed so that the high pressure pump 10 is bypassed or bypassed so that the pump booster 11 supplies the manifold 6 of injectors 5 with gasoline under a stabilized low pressure.
• the computer 1 When the engine is running at a number of revolutions greater than the predetermined threshold allowing proper operation of the high pressure pump 10, the computer 1 then closes the third channel C and opens the first channel A of the pressure regulator 9.
• the high pump pressure 10 then injects petrol into the manifold 6 under high pressure while the booster pump 11 supplies petrol to the high pressure pump 10, the second path B is selectively opened by the regulator to allow return or discharge to the reservoir 14 excess fuel supplied to rail 6.
• the system defaults to open track B so as to promote a rapid return of the fuel to the tank and thus reduce the fuel pressure prevailing in the boom 6.
• a load shedding of the high-pressure pump 10 is thus formed. This makes it possible to avoid stressing the injectors 5 by a residual pressure prevailing in the manifold 6. This reduces the criticality of the sealing of the injectors (leaks to the cylinders) and of evaporation of the system formed by the fuel line and the ramp (SHED standards).
• the path B directly connects the high pressure pump 10 to the fuel tank 14.
• the path B is connected to the conduit supply 15, downstream of the booster pump 11.
• This booster pump is further provided with a low pressure regulator 16 which, in the event of a power failure of the engine-control system, is forced to open in the direction of return of gasoline to the tank so as to relieve the low and high pressure network.
• the high regulator pressure 9 may not be controlled by the computer 1 but, for example, by a shock detector, a vehicle attitude detector or even any organ for detecting malfunctions of the vehicle.

Landscapes

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

Applications Claiming Priority (3)

Publications (2)

Family

ID=9506737

Family Applications (1)

Country Status (6)

Families Citing this family (9)

Family Cites Families (8)

• 1997
  • 1997-05-09 FR FR9705724A patent/FR2763100B1/fr not_active Expired - Fee Related
• 1998
  • 1998-05-06 EP EP98924389A patent/EP0980472B1/de not_active Expired - Lifetime
  • 1998-05-06 DE DE69804602T patent/DE69804602T2/de not_active Expired - Fee Related
  • 1998-05-06 WO PCT/FR1998/000911 patent/WO1998051921A1/fr not_active Ceased
  • 1998-05-06 BR BR9809607-9A patent/BR9809607A/pt not_active IP Right Cessation
  • 1998-05-06 US US09/423,112 patent/US6170473B1/en not_active Expired - Fee Related

Non-Patent Citations (1)

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