EP1319829A1 - Kraftstoffzufuhrsystem für einen Verbrennungsmotor - Google Patents

Kraftstoffzufuhrsystem für einen Verbrennungsmotor Download PDF

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Publication number
EP1319829A1
EP1319829A1 EP02293078A EP02293078A EP1319829A1 EP 1319829 A1 EP1319829 A1 EP 1319829A1 EP 02293078 A EP02293078 A EP 02293078A EP 02293078 A EP02293078 A EP 02293078A EP 1319829 A1 EP1319829 A1 EP 1319829A1
Authority
EP
European Patent Office
Prior art keywords
fluid
circuit
pump
return
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02293078A
Other languages
English (en)
French (fr)
Inventor
Dominique Pierre François Guerin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Original Assignee
Renault SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP1319829A1 publication Critical patent/EP1319829A1/de
Withdrawn legal-status Critical Current

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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

Definitions

  • the present invention relates to power systems of a fluid device.
  • the invention relates to a system supplying a device with fluid, of the type comprising a circuit fluid intake in the device comprising a pump supply connected, on the one hand, to a fluid reservoir, and, on the other hand, to means for injecting fluid into the device, a excess fluid return circuit to the reservoir extending between a portion of the intake circuit located downstream of the pump and the tank.
  • a particularly interesting application of this type of fuel system is the fuel supply of a vehicle automobile equipped with an internal combustion engine.
  • the energy consumed by the injection pump has an influence not negligible on the total consumption of the vehicle, as well as on carbon dioxide emissions.
  • These regulation means act as a switch in shutting off the fuel return circuit when the pressure level supplied by the pump is insufficient or, on the contrary, by opening this fuel return system when the pressure level supplied by the pump is greater than a predetermined threshold value.
  • the open or closed state of the switch also provides indication of the fuel pressure level prevailing in the intake circuit, downstream of the pump.
  • This information can be used to stop feeding fuel injectors and stop the engine before dry breakdown, which prevents damage to the engine and for the exhaust system, in particular when it has a catalytic converter.
  • This type of feeding system nevertheless presents a major drawback relating to the fact that its operation is accompanied by a significant increase in consumption for the engine. Also, the object of the invention is to overcome this disadvantage.
  • a system is therefore proposed.
  • supplying a device with fluid comprising a circuit fluid intake in the device comprising a pump supply system of an injection system connected, on the one hand, to a fluid reservoir and, on the other hand, to means for injecting fluid in the device, an excess fluid return circuit to the tank, which extends between a portion of the intake circuit located downstream of the pump and the reservoir, and means for regulating pressure to regulate the pressure of the fluid in the means injection.
  • the means of pressure regulators are arranged in the fluid return circuit in excess and include means for measuring a characteristic representative of the pressure level prevailing downstream of the pump, and control means controlling the injection pump as a function of the value of said characteristic.
  • the pressure prevailing downstream of the pump is therefore regulated, on the one hand, by controlling the flow of fluid in the return circuit of fuel, and, on the other hand, by acting on the operating regime of the pump, which significantly reduces the level of overall engine consumption.
  • the means of regulation have a diaphragm forming a valve, which is mounted in a housing provided with a fluid return channel, which communicates with the intake circuit, and one free end of which constitutes a seat for the membrane, the membrane being mounted so displaceable in the casing under the effect of the pressure prevailing in the intake circuit, between a first closing position of the fluid return circuit in which it rests in abutment against the seat and a second position for opening the return circuit of fluid in which it is spaced from said seat.
  • said measuring means include means for measuring resistance electrical portion of an electrical circuit comprising the valve and the fluid return channel.
  • the membrane delimits in the housing a first chamber in which is placed a return spring and a second chamber in which the fluid circulates.
  • the casing comprises two housing elements made of electrically conductive material between which is placed the membrane, one of the housing elements being connected to the control means and internally delimiting the first chamber, the other housing element, which delimits internally the second chamber, being provided with said return channel of fluid and being connected to ground, the membrane being made of electrically insulating material carrying an electrically element conductor suitable for bringing electrical elements of housing when the membrane is in the first position.
  • the fluid return channel is made of material electrically conductive.
  • the invention also relates to the use of a system as defined above for the supply of fuel from an internal combustion engine.
  • FIG 1 there is shown a supply system of a fluid device, designated by the general reference 10.
  • this system 10 is intended to supply fuel to an internal combustion engine 12 of a motor vehicle.
  • other applications may also be considered mutatis mutandis.
  • the system 10 essentially comprises a circuit 14 fuel intake to engine 12.
  • This intake circuit is in communication, through one of its ends 16, with a reservoir of fuel (not shown) and, by its opposite end 18, with electro-injectors 20 controlled by an electronic control unit- motor which determines the opening time of the different injectors and thus the amount of fuel injected into the engine cylinders.
  • the intake circuit 14 is provided with a pump 22 supply system for an injection system controlled by a central unit 24, so as to regulate the fuel pressure in the circuit intake.
  • the supply system includes a circuit 26 return fuel intended to reinject excess fuel into The reservoir.
  • this circuit 26 for returning fuel is provided with a pressure regulator 28 ensuring, part, the pressure regulation around a set point of predetermined pressure corresponding to an average value of pressure to obtain nominal pump operation 22, without overheating, and, on the other hand, a measurement of the pressure level prevailing in the fuel intake circuit 14, downstream of the pump 22 or regulator discharge flow level.
  • the regulator has a casing 30 made of electrically conductive material comprising a first housing element 32 and a second housing element 34, each having a generally cylindrical side wall, and assembled with each other with the interposition of a membrane 36 in the form of disc and elastically deformable and electrically insulating material, by means of a crimp 38 made of an electrically material insulating.
  • the first housing element 32 delimits, jointly with the membrane 36, a first chamber 40 in which is placed a spring 42, resting, on the one hand, against the bottom of the first element of housing 32, and, on the other hand, on a seat 43 made of a material electrically conductive and which is fixed on the membrane 36 at the by means of a rivet 44, also made of material electrically driver.
  • the second housing element 34 internally defines, jointly with the membrane 36, a second chamber 45 in which the fuel circulates. It is provided of a connector 46 for its connection to the circuit 14 of admission of fuel and a channel 48 made of electrically material conductor, for example come of matter with the second element of housing 34, which projects into the internal volume of the second housing element 34 and which opens, outside, towards the tank, via the fuel return circuit 26.
  • the membrane 36 In the equilibrium position, the membrane 36 is supported, by through the rivet 44, against the end edge 50 of the channel 48.
  • the conductor 52 is connected to ground by through the spring 42, the seat 43, the rivet 44, and the channel 48.
  • channel 48 is open and allows a return of fuel in the circuit 26 for returning fuel to the tank and this, with a flow all the more important as the value of the pressure prevailing downstream of the pump 22 is important.
  • the voltage level present on the conductor 52 depends on the electrical resistance of the portion of the electrical circuit constituted, in particular, by the spring 42, the seat 43, the rivet 44, the fuel blade L located between the rivet 44 and the end edge 50 from channel 48, and through channel 48 itself.
  • the thickness and therefore the value of the resistance of the fuel blade L depends on the pressure level prevailing in the second housing element 34, and therefore the flow in channel 48.
  • the control unit is thus provided with means, of the type conventional, able to measure the value of the resistance of this blade L of fuel.
  • This information is used by the control unit 24 to regulate the operation of pump 22 accordingly.
  • the control unit 24 controls the pump 22 so as to reduce the flow rate.
  • the invention which has just been described, which uses a pressure regulator to reduce the pressure prevailing in a fuel intake circuit, on the one hand, mechanically, increasing the fuel flow in the circuit return of excess fuel and, in a controlled manner, by controlling the injection pump accordingly, allows a significant reduction fuel consumption.
  • the regulator of the power system which has just been described can advantageously be positioned in the tank, which significantly reduces the cost and the size of the power system.
  • the regulator consists of a pressure regulator simple, that is to say that the first box element is isolated from the rest of the supply system, it is also possible, as a variant, to arrange the regulator in the form of a pressure regulator differential controlled by the pressure prevailing in the distributor engine intake 12.
  • the first element of the regulator case is provided with a conduit for communicating its volume internal with the intake manifold.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP02293078A 2001-12-12 2002-12-12 Kraftstoffzufuhrsystem für einen Verbrennungsmotor Withdrawn EP1319829A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0116045A FR2833307B1 (fr) 2001-12-12 2001-12-12 Systeme d'alimentation d'un dispositif en fluide et utilisation d'un tel systeme pour l'alimentation en carburant d'un moteur a combustion interne
FR0116045 2001-12-12

Publications (1)

Publication Number Publication Date
EP1319829A1 true EP1319829A1 (de) 2003-06-18

Family

ID=8870381

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02293078A Withdrawn EP1319829A1 (de) 2001-12-12 2002-12-12 Kraftstoffzufuhrsystem für einen Verbrennungsmotor

Country Status (2)

Country Link
EP (1) EP1319829A1 (de)
FR (1) FR2833307B1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4426978A (en) * 1980-01-31 1984-01-24 Nissan Motor Company, Limited Fuel supply control system for an internal combustion engine
US4800859A (en) * 1986-06-25 1989-01-31 Nippondenso Co., Ltd. Fuel pump control apparatus
EP0577477A1 (de) * 1992-06-30 1994-01-05 Regie Nationale Des Usines Renault S.A. Brennstoffeinspritzvorrichtung für Brennkraftmaschine
US5579739A (en) * 1994-01-14 1996-12-03 Walbro Corporation Returnless fuel system with demand fuel pressure regulator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4426978A (en) * 1980-01-31 1984-01-24 Nissan Motor Company, Limited Fuel supply control system for an internal combustion engine
US4800859A (en) * 1986-06-25 1989-01-31 Nippondenso Co., Ltd. Fuel pump control apparatus
EP0577477A1 (de) * 1992-06-30 1994-01-05 Regie Nationale Des Usines Renault S.A. Brennstoffeinspritzvorrichtung für Brennkraftmaschine
US5579739A (en) * 1994-01-14 1996-12-03 Walbro Corporation Returnless fuel system with demand fuel pressure regulator

Also Published As

Publication number Publication date
FR2833307A1 (fr) 2003-06-13
FR2833307B1 (fr) 2004-10-15

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