US3667438A - Fuel injecting device for an internal combustion engine - Google Patents

Fuel injecting device for an internal combustion engine Download PDF

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Publication number
US3667438A
US3667438A US76444A US3667438DA US3667438A US 3667438 A US3667438 A US 3667438A US 76444 A US76444 A US 76444A US 3667438D A US3667438D A US 3667438DA US 3667438 A US3667438 A US 3667438A
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United States
Prior art keywords
fuel
chamber
closing member
deducting
injection
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.)
Expired - Lifetime
Application number
US76444A
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English (en)
Inventor
Jean Moulin
Marcel Regneault
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Automobiles Peugeot SA
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Automobiles Peugeot SA
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Publication date
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    • 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
    • F02M59/365—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages valves being actuated by the fluid pressure produced in an auxiliary pump, e.g. pumps with differential pistons; Regulated pressure of supply pump actuating a metering valve, e.g. a sleeve surrounding the pump piston
    • 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
    • F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
    • F02M2700/13—Special devices for making an explosive mixture; Fuel pumps
    • F02M2700/1317—Fuel pumpo for internal combustion engines
    • F02M2700/137—Fuel pump with control of fuel outlet of pumping chamber to delivery pipe

Definitions

  • ABSTRACT Fuel injecting device for an internal combustion engine comprising at least one injection pump connected to at least one injector and a regulating system of the liquid abutment type formed by a fuel relief or discharge passageway for the injection pump in which is interposed a movable closing member whose movement is controlled by a fluid pressure regulated by an acceleration control of the engine so that the amount of fuel delivered for each stroke of the pump is determined by the movement of the closing member.
  • the characteristic of the injecting device is that a fuel deducting chamber having an inlet constituted by a throttling orifice is connected in parallel with the discharge passageway upstream of the closing member.
  • These devices may be adapted to conventional injection systems and comprise a fuel deduction chamber having a variable volume and connected to the delivery chamber of the injection pump by way of a restricted or throttling orifice, and neutralizing means for holding the movable wall of the delivery chamber stationary or closing the passage interconnecting the delivery chamber and fuel deducting chamber, said neutralizing means being so arranged that the injection law is modified only under given conditions for which this modification is necessary.
  • Injection systems are also known in which the regulation of the amount of fuel injected is effected by a liquid abutment device.
  • the object of the invention is to provide a device for effecting a modification of the injection law under predetermined conditions of operation of the engine in the case where the injection system for the engine comprises a liquid abutment regulating device.
  • the invention provides an injection device for an internal combustion engine comprising at least one injection pump connected to at least one injector and a regulating system of the liquid abutment type comprising a discharge passageway of the injection pump in which is interposed a closing member whose travel is controlled by a fluid pressure regulated by the acceleration control of the engine, whereby the amount of fuel delivered to the injector for each delivery stroke of the pump is determined by the travel of said closing member, wherein there is branch-connected to said discharge passageway, upstream of said closing member, a fuel deducting chamber having an inlet constituted by a throttling orifice.
  • the throttling or constricted orifice of said fuel deducting chamber has a check valve and said chamber has an outlet connected to said discharge passageway under the control of said closing member.
  • FIG. I is a partial diagrammatic sectional view, partly in elevation, of an injection device according to the invention
  • FIG. I shows a body C containing an injection pump and a part of the regulating system, injection conduits, such as conduit 1, connecting the injection pump to injectors, such as I.
  • the injection pump comprises a cylinder la which is a part of a stepped bore 1 and defines a delivery chamber 2 connected to a fuel pump (not shown) by way of a supply orifice 3.
  • the chamber 2 receives a piston 4 which pumps the fuel, by way of passage 5 and a check valve 6, to the injector I.
  • the piston 4 has a lateral recess 7 and passageways 8a, 8b.
  • the recess 7 communicates with the injection conduits i and the passageways 8a, 8b put the supply passageway 3 in communication with the delivery chamber 2.
  • the piston 4 is shifted by a mechanism of which only a cam c has been shown.
  • the latter operates in synchronism with the engine and causes the piston to undergo an axial reciprocating motion and a rotary motion which are so combined as to deliver the fuel and distribute it to the various injectors.
  • a unit constitutes a distributor pump.
  • the invention is also applicable to a system having pumps in line, in which the distribution function is omitted.
  • the regulating system comprises a differential piston 9 which is integral with the piston 4 and located in a part 1b of the bore 1.
  • the two pistons are separated by an annular recess 10.
  • the differential piston 9 and the bore 1 define a chamber 11 which is connected, by way of a passageway 12, to the supply pump and, by way of a passageway 13 and a check valve 14, to a chamber 15 defined by a bore 16 and a slide valve 17 which is slidably mounted in the bore and biased to its lower position by a spring 18.
  • the lower position of the valve 17 is determined by the abutment of a flange 19 against the body C.
  • the recess 10 between the pistons 4 and 9 permits a discharge of fuel from the chamber 11 by way of an orifice 20 for an axial movement or rise of the piston which is slightly less than its maximum travel, this discharge being, for example, to the supply pump.
  • a pipe 21, which is in parallel with the check valve 14, has a needle valve 22 which is shifted by the accelerator through a suitable mechanism and constitutes a variable throttling means 23.
  • the slide valve 17 has an annular recess or groove 24 which is located between two lands and defines with the bore 16 a chamber 25 permanently communicating with the delivery chamber 2 of the injection pumpby way of a passageway 26.
  • An orifice 27 serves as a discharge orifice for the chamber 25 when the slide valve 17 has been shifted or raised an extent exceeding 1,. This orifice can be, for example, connected to the fuel supply pump.
  • the device is completed by a fuel deducting chamber 28 which communicates, on one hand, with the passageway 26 by way of a constricted or throttling orifice 29 and a check valve 30 and, on the other hand, with the bore 16 by way of a passageway 31 which is suitably positioned with respect to the upper face 24a of the recess 24 of the slide valve.
  • the face 24a unmasks or uncovers the orifice 31 for a movement or rise 1 of the slide valve 17 which exceeds 1 Operation of such a device will first be rapidly described, assuming that the fuel deducting means according to the invention designated by the reference numerals 28 to 31, are not included.
  • the slide valve 17 biased by the spring 18 descends and urges the fuel contained in the chamber 15 through the passageway 21 and the throttling orifice 23.
  • the slide valve 17 therefore descends at a speed depending on the section of passage of the throttling means 23, which are controlled by the accelerator.
  • the slide valve has no longer time enough to redescend to its extreme position determined by the abutment of the flange 19 against the body C.
  • the slide valve starts from a higher point of departure. In its extreme lower position, the slide valve 17 has what might be called a liquid abutment.
  • the quantity of fuel injected is less than before since the slide valve 17, in starting from a higher position, reaches the level 11 sooner and uncovers the discharge orifice 27 which results in the injection being stopped sooner.
  • This case corresponds to regulation or partial load conditions of operation.
  • the lower extreme position of the slide valve, determined by the liquid abutment, is more or less high and the quantity of fuel injected can therefore be of any value between zero and the maximum quantity corresponding to full load.
  • the slide valve 17 Under partial load conditions, the slide valve 17 has a liquid abutment and is shifted from a higher extreme lower position and displaced to such a level that, after deduction of fuel, the orifice 31 is uncovered and put in communication with the discharge orifice 27. Under these conditions, the fuel deducting device is operative for each injection and the law of injection is modified as follows For a partial load close to full load, that is, for a liquid abutment close to the solid abutment of the slide valve 17, the chamber 28 communicates with the discharge orifice 27 for a very short period of time. This situation is represented by the curve shown in FIG. 2. The angle of rotation ABc of the cam during which the fuel discharged is small.
  • the pressure p, at the end of the discharge is therefore lower than p since the relief of pressure lasts longer. Consequently, the quantity of fuel deducted for each injection in this case corresponds to a greater pressure variation (p p Consequently, a larger quantity of fuel is deducted than in the preceding case.
  • the device has less and less effect as the speed of operation of the engine increases. Indeed, the higher the speed of operation, the shorter the time between two cycles and the shorter the time for discharging fuel from the deducting chamber 28 and the smaller the quantity of fuel deducted.
  • the curve e shown in FIG. 3 and FIG. 5 respectively corresponds to the curve d shown in FIG. 3 and FIG. 4 in the case of the injection device having fuel deducting means.
  • an injection law such as that shown in FIG. 5. It will be understood that it is possible to obtain injection laws which are different from that shown. Indeed, it is possible to obtain, according to the characteristics of the fuel deducting system, injection laws which are similar to those described in the aforementioned patents. For this purpose it is sufiicient to replace the constant volume chamber 28 by a variable volume chamber, for example in accordance with the various embodiments disclosed in the aforementioned patents. These various possible modifications have been represented in dot-dash line in FIG. 1 in the form of a device D for varying the volume of the fuel deducting chamber 28.
  • the movable wall of the device D may be held stationary as described in the aforementioned US. Pat. No. 3,456,629.
  • a fuel injecting device for an internal combustion engine comprising at least one injection pump connected to at least one injector and a regulating system of the liquid abutment type formed by a fuel relief or discharge passageway for the injection pump in which is interposed a movable closing member whose movement is controlled by a fluid pressure adapted to be regulated by an acceleration control of the engine whereby the amount of fuel delivered to the injector for each delivery stroke of the pump is determined by the movement of said closing member, the feature that there is provided, connected in parallel with said discharge passageway upstream of said closing member, a fuel deducting chamber having an inlet constituted by a throttling orifice combined with a check valve and an outlet which communicates with said discharge passageway under the control of said closing member.
US76444A 1969-12-19 1970-09-29 Fuel injecting device for an internal combustion engine Expired - Lifetime US3667438A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6944138A FR2071175A5 (de) 1969-12-19 1969-12-19

Publications (1)

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US3667438A true US3667438A (en) 1972-06-06

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US76444A Expired - Lifetime US3667438A (en) 1969-12-19 1970-09-29 Fuel injecting device for an internal combustion engine

Country Status (5)

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US (1) US3667438A (de)
AT (1) AT301268B (de)
DE (1) DE2037449C3 (de)
FR (1) FR2071175A5 (de)
GB (1) GB1325885A (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4200075A (en) * 1977-03-22 1980-04-29 Diesel Kiki Company, Ltd. Fuel injection apparatus
US4348998A (en) * 1977-01-29 1982-09-14 Robert Bosch Gmbh Fuel injection pump
US4387686A (en) * 1981-01-27 1983-06-14 Robert Bosch Gmbh Fuel injection apparatus for internal combustion engines, in particular for diesel engines
US4398518A (en) * 1980-01-12 1983-08-16 Robert-Bosch Gmbh Fuel injection apparatus for internal combustion engines, in particular for diesel engines
US4398519A (en) * 1980-07-02 1983-08-16 Robert-Bosch Gmbh Fuel injection apparatus for internal combustion engines, in particular for diesel engines
US4407253A (en) * 1980-04-03 1983-10-04 Robert Bosch Gmbh Fuel injection pump for self-igniting internal combustion engines
US4465049A (en) * 1980-01-12 1984-08-14 Robert Bosch Gmbh Fuel injection apparatus for internal combustion engines, in particular diesel engines
US4696271A (en) * 1984-01-11 1987-09-29 Robert Bosch Gmbh Fuel injection pump
EP0860606A3 (de) * 1997-02-20 2000-01-05 Wärtsilä NSD OY AB Kraftstoffeinspritzpumpenanordnung in einer Brennkraftmaschine
US6626148B1 (en) * 1999-08-27 2003-09-30 Delphi Technologies, Inc. Fuel pump

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2173814A (en) * 1938-03-15 1939-09-19 Bischof Bernhard Fuel injection apparatus for internal combustion engines
US3403629A (en) * 1966-07-19 1968-10-01 Bosch Gmbh Robert Fuel injection pump for internal combustion engines
US3456629A (en) * 1966-08-01 1969-07-22 Peugeot Fuel injection devices for compression ignited internal combustion engines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2173814A (en) * 1938-03-15 1939-09-19 Bischof Bernhard Fuel injection apparatus for internal combustion engines
US3403629A (en) * 1966-07-19 1968-10-01 Bosch Gmbh Robert Fuel injection pump for internal combustion engines
US3456629A (en) * 1966-08-01 1969-07-22 Peugeot Fuel injection devices for compression ignited internal combustion engines

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4348998A (en) * 1977-01-29 1982-09-14 Robert Bosch Gmbh Fuel injection pump
US4200075A (en) * 1977-03-22 1980-04-29 Diesel Kiki Company, Ltd. Fuel injection apparatus
US4398518A (en) * 1980-01-12 1983-08-16 Robert-Bosch Gmbh Fuel injection apparatus for internal combustion engines, in particular for diesel engines
US4465049A (en) * 1980-01-12 1984-08-14 Robert Bosch Gmbh Fuel injection apparatus for internal combustion engines, in particular diesel engines
US4407253A (en) * 1980-04-03 1983-10-04 Robert Bosch Gmbh Fuel injection pump for self-igniting internal combustion engines
US4398519A (en) * 1980-07-02 1983-08-16 Robert-Bosch Gmbh Fuel injection apparatus for internal combustion engines, in particular for diesel engines
US4387686A (en) * 1981-01-27 1983-06-14 Robert Bosch Gmbh Fuel injection apparatus for internal combustion engines, in particular for diesel engines
US4696271A (en) * 1984-01-11 1987-09-29 Robert Bosch Gmbh Fuel injection pump
EP0860606A3 (de) * 1997-02-20 2000-01-05 Wärtsilä NSD OY AB Kraftstoffeinspritzpumpenanordnung in einer Brennkraftmaschine
US6626148B1 (en) * 1999-08-27 2003-09-30 Delphi Technologies, Inc. Fuel pump

Also Published As

Publication number Publication date
GB1325885A (en) 1973-08-08
FR2071175A5 (de) 1971-09-17
DE2037449B2 (de) 1974-12-12
AT301268B (de) 1972-08-25
DE2037449C3 (de) 1975-08-14
DE2037449A1 (de) 1971-06-24

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