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
  • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
  • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
  • F02M69/54—Arrangement of fuel pressure regulators
• • 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
  • F02D41/3082—Control of electrical fuel pumps
• • 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
  • 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
  • F02M37/08—Feeding by means of driven pumps electrically driven
• • 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
  • F02M37/08—Feeding by means of driven pumps electrically driven
  • F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir
• • 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
  • F02D2041/224—Diagnosis of the fuel system
• • 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
  • 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
  • F02M37/08—Feeding by means of driven pumps electrically driven
  • F02M2037/085—Electric circuits therefor
  • F02M2037/087—Controlling fuel pressure valve

Definitions

• the present invention relates to the field of fuel supply devices for internal combustion engines on motor vehicles.
• the conventional fuel supply systems of internal combustion engines include a pump 10 which takes the fuel from a tank 12, and directs this fuel towards the zone of use, that is to say generally towards the injectors 14, via a supply pipe 16.
• the excess fuel is returned to the tank 12 using a return pipe 18.
• the pump 10 generally comprises an upstream filter 11. plus a downstream filter 13 is generally placed at the outlet of the pump 10, on the supply pipe 16.
• This conventional arrangement known as a loop, shown in FIG. 1, has the drawback of leading to a heating of the fuel passing through the zone of use 14 and brought back to the tank 12 by the return duct.
• it requires a significant permanent flow of fuel at the outlet of the pump 10, therefore a non-negligible consumption of electric current.
• a pressure regulator 20 working in bypass is preferably integrated on the supply line 16.
• This pressure regulator 20 ensures the return of the excess fuel, towards the reservoir 12.
• This pressure regulator 20 has its inlet connected to the supply line 16, generally downstream of the filter 13, by a bypass duct 15. The outlet of the regulator 20 opens into the reservoir 12.
• This solution certainly has the advantage of reducing the amount of fuel passing through the pump as well as the amount of fuel passing through the filter. However, it is not entirely satisfactory. On the one hand, it requires a high cost sensor 22 because of the required measurement precision. On the other hand, it does not always lead to satisfactory pressure regulation.
• the present invention now aims to improve the known fuel supply devices.
• a fuel supply device for an internal combustion engine comprising a pump designed to draw fuel from a tank and a pressure-sensitive element prevailing in a supply line without connected bypass. at the pump outlet and suitable for controlling the commissioning of the pump, characterized in that it comprises a pressure regulator placed in series on the supply line without branch connected to the pump outlet, upstream of the fuel use site, the pressure-sensitive element is a pressure switch whose tilting threshold is greater than the required fuel use pressure, and the pressure reducer is advantageously located near the use site on a rail of injectors.
• FIGS. 4 and 5 schematically represent, in the form of functional blocks, two alternative embodiments of a supply system in accordance with the present invention
• FIG. 6 represents a schematic view in longitudinal section of a pressure sensor capable of being used in the context of the present invention.
• FIG. 7 shows a schematic view in longitudinal section of a pressure regulator capable of being used in the context of the present invention.
• a pressure regulator capable of being used in the context of the present invention.
• an assembly comprising a fuel tank 12, a pump 10 associated with an upstream filter 11, and a supply line 16 connected to the outlet of the pump 10 and designed to direct fuel to a site 14 of use, for example an injector manifold.
• the system further comprises a sensor 30 sensitive to the pressure prevailing in the supply line 16 and a regulator regulator 40 placed in series on the supply line. supply 16, upstream of the site of use 14.
• the pressure sensor 30 is connected to a control module 50 which itself controls the pump 10.
• the fuel tank 12 and the pump 10, preferably electric, can be the subject of numerous variants. These will therefore not be described in more detail below.
• the pressure sensor 30 is preferably formed of a simple pressure switch.
• FIG. 6 appended shows a preferred embodiment of such a pressure switch 30.
• the contactor illustrated in this figure 6 comprises a housing 31 divided into two chambers 32, 33 by a deformable membrane 34 stressed on one side by a calibrated spring 35, and on the other by the pressure of the fuel to be measured prevailing in the supply line 16.
• the sensor 30 also comprises two electrical contacts 36, 37 whose connection state depends on the position of the diaphragm 34, therefore on the fuel pressure prevailing in the supply line 16.
• one of the contacts 36 is for example secured to the housing 31 while the second contact 37 is secured to the membrane 34.
• a first chamber 32 preferably sealed, houses the spring 35 and the two electrical contacts 36, 37.
• the second chamber 33 is provided with a nozzle 38 allowing to put said chamber 33 in communication with the supply line 16.
• the electrical contacts 36 and 37 are adapted to be connected, which corresponds to a switch in the closed state, when the fuel pressure in the supply line 16 is less than a predetermined threshold.
• the supply line 16 is a line without branching, or dead end, connected to the outlet of the pump 10; that is to say that the supply line 16 does not include any bypass making it possible to bring excess fuel back to the tank 12.
• the regulator regulator 40 is, as indicated previously, placed in series on the supply line 16 between the pump 10 and the site of use of fuel 14.
• the regulator regulator 40 can be the subject of different embodiments.
• a regulator regulator 40 comprising a housing 41 divided into two chambers 42, 43 by a deformable membrane 44 sensitive to pressure.
• a first chamber 42 houses a calibrated spring 45 which urges the membrane 44.
• the second chamber 43 has an inlet 46 formed on a nozzle 47 and at least one outlet 48.
• the inlet 46 is controlled by a valve 49.
• This valve 49 has a movable element 51 linked to the membrane 44 and which cooperates with a seat 52 linked to the housing 41.
• the membrane 44 is biased on one side by the calibrated spring 45 and on the side order by the fuel pressure prevailing in the chamber 43.
• the valve 49 provided on the inlet 46 opens when the pressure in the chamber 43 is less than the setting force of the spring 45 and on the contrary the valve 49 closes when the pressure in the chamber 43 becomes greater than the setting of the spring 45.
• the pressure regulator 40 makes it possible to obtain a constant pressure in the chamber 43.
• the nozzle 47 which forms the inlet 46 is connected to the part of the supply conduit 16 coming from the pump 10.
• the outlet 48 is in turn directed towards the site of use 14 by any suitable connection.
• FIGS. 4 and 5 appended a control module for the pump 10 is shown diagrammatically under the reference 50.
• the setting pressure of the pressure sensor 30 is greater than the operating pressure required at the outlet of the pressure reducing sensor 40.
• the system preferably comprises, and in a manner known per se, a filter 13 on the supply line 16.
• the filter 13 can be located downstream of the pressure sensor 30 as illustrated in FIG. 4, or upstream of this pressure sensor 30 as illustrated in FIG. 5, which makes it possible to compensate for the possible and variable pressure drop of the filter 13 (by clogging), without increasing the pressure difference necessary for the proper functioning of the pressure reducing regulator 40 ..
• the pressure sensor 30 and / or the filter 13 can each be placed either inside the tank 12, or outside the tank 12, or even on a wall of the latter.
• the regulator regulator 40 is located at the site of use, or preferably on the injector rail.
• regulator regulator 40 located near the site of use 14 directly defines the pressure of use, it is possible to use supply conduits 16 of smaller sections than in conventional systems, without fear of harmful influences caused by possible online pressure drops.
• the pump 10 is also traversed only by the fuel actually used.
• the current consumption of the pump therefore remains low.
• the lifespan of the pump is extended compared to the known prior arrangements comprising a bypass on the supply line 16.
• the pressure sensor delivers all or nothing information, calibrated by a pressure threshold, directly on the power stage controlling the pump 10, this pressure threshold being chosen slightly higher than the pressure of use of the fuel by the engine as indicated previously.
• the chamber 42 housing the calibration spring 45 of the pressure reducer 40 can be a closed chamber as illustrated in the figure
• this chamber 42 is placed at a reference pressure, for example atmospheric pressure or even the pressure of the intake manifold.
• the drawing assembly comprising the pump 10 can be equipped with a fuel gauging system.
• the invention also relates to tanks equipped with the aforementioned supply system.
• the all-or-nothing information calibrated with respect to a pressure threshold, coming from the pressure sensor 30, is applied to the engine control computer 60, as illustrated in FIGS. 4 and 5.
• This computer 60 can also integrate the aforementioned pump control module 50.
• the computer 60 can use the information from the sensor 30 to establish the diagnosis of the fuel supply system.
• This diagnostic is carried out according to strategies for monitoring the pressure in the fuel system (monitoring the pressure build-up time after switching on, maintaining the fuel pressure after an engine shutdown phase, constant pressure or maintained within a predetermined range ).
• This diagnostic function can also be used alone; however preferably the fuel circuit pressure information from the pressure sensor 30 is also used to control the fuel pump 10 and allow gains in electrical energy consumption as indicated above.
• This architecture not only allows a gain on the number of sensors used, but it allows also by integrating the piloting function of the fuel pump 10 into the engine control system 60, to reduce the cost of the complete system (a single control electronics 60, a single source of information), and to obtain strategies for more complete control (additional corrections possible thanks to new information) and simpler diagnosis (reaction recognized following a request from the control function).
• the use of information from the pressure sensor 30 makes it possible to diagnose the fuel supply system by the engine control system (leaks on the injection components 14, proper functioning of the components).

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Fuel-Injection Apparatus (AREA)
• Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
• Combined Controls Of Internal Combustion Engines (AREA)
• Jet Pumps And Other Pumps (AREA)

Priority Applications (4)

Applications Claiming Priority (4)

Publications (1)

Family

ID=26231441

Family Applications (1)

Country Status (7)

Cited By (4)

Families Citing this family (4)

Citations (6)

• 1995
  • 1995-03-07 FR FR9502624A patent/FR2725245B1/fr not_active Expired - Fee Related
  • 1995-10-02 DE DE69507318T patent/DE69507318T2/de not_active Expired - Lifetime
  • 1995-10-02 ES ES95933465T patent/ES2126935T3/es not_active Expired - Lifetime
  • 1995-10-02 WO PCT/FR1995/001275 patent/WO1996010693A1/fr active IP Right Grant
  • 1995-10-02 JP JP51147096A patent/JP3816519B2/ja not_active Expired - Fee Related
  • 1995-10-02 BR BR9509228A patent/BR9509228A/pt not_active IP Right Cessation
  • 1995-10-02 EP EP95933465A patent/EP0784749B1/fr not_active Expired - Lifetime

Patent Citations (6)

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