US3844261A - Device for regulating the rate of flow of recycled exhaust gases in an internal combustion engine - Google Patents

Device for regulating the rate of flow of recycled exhaust gases in an internal combustion engine Download PDF

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Publication number
US3844261A
US3844261A US00329822A US32982273A US3844261A US 3844261 A US3844261 A US 3844261A US 00329822 A US00329822 A US 00329822A US 32982273 A US32982273 A US 32982273A US 3844261 A US3844261 A US 3844261A
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United States
Prior art keywords
pressure
auxiliary piping
exhaust duct
sensitive
gases
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Expired - Lifetime
Application number
US00329822A
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English (en)
Inventor
G Garcea
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Fiat Auto SpA
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Alfa Romeo SpA
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Assigned to ALFA LANCIA S.P.A., A CORP. OF ITALY reassignment ALFA LANCIA S.P.A., A CORP. OF ITALY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ALFA ROMEO S.P.A.
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Expired - Lifetime legal-status Critical Current

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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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/39—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with two or more EGR valves disposed in series
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/59—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor
    • F02M26/61—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor in response to exhaust 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/63—Systems for actuating EGR valves the EGR valve being directly controlled by an operator
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/70—Flap valves; Rotary valves; Sliding valves; Resilient valves
    • 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
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures

Definitions

  • ABSTRACT In an internal combustion engine equipped with a mechanism for recycling the exhaust gases, or at least a fraction thereof to dilute the fresh mixture, the im provement consisting in providing means for sensing the pressure drop of the gases in the exhaust duct, means for sensing the pressure drop in the auxiliary duct intended for recycling the exhaust gases, and a member being provided for establishing a proportionality ratio between the respectively sensed pressure drops.
  • the amount of exhaust gas taken downstream of the engine in correspondence with the exhaust duct and suitably cooled, which is required, should be introduced upstream of the engine.
  • this exhaust gas feed downstream of the carburetor, between the carburetor and the induction valve In order to prevent deposits and fouling in the carburetor, in the engines equipped with a carburetor, it is advisable to effect this exhaust gas feed downstream of the carburetor, between the carburetor and the induction valve.
  • a first embodiment of the device according to the present invention has for its object to render the dilution ratio of the fresh mixture to the exhaust gases constant irrespective of the conditions of use of the engine in the operative range which is of interest; such an approach is, in fact, considered to be satisfactory as itself.
  • the device is based on the idea that, with a fair degree of approximation, if one maintains constant the ratio between the rate of flow of the exhaust gases introduced in the mixture (that is, recycled exhaust) and the overall rate of flow of exhaust gases, also the dilution ratio (that is, the ratio between the rate of flow of the recycled gas and the rate of flow of fresh mixture) remains constant.
  • the admixture ratio intended as the ratio between the rate of flow of air and the rate of flow of fuel drawn by the engine
  • the variations of the admixture ratio are generally so slight as to have no determining bearing on a regulation carried out in this way.
  • An object of the present invention is to provide a particularly simple and reliable device for regulating the rate of flow of the recycled gases so that it may be in a substantially constant ratio with the rate of flow ofthe exhaust gases and thus, finally, with the rate of flow of the gases drawn by the engine.
  • an internal combustion engine equipped with an intake duct, an exhaust duct and an auxiliary piping connected to said exhaust duct to draw a portion of the gases flowing therethrough to discharge them into said intake duct, is characterized in addition by first means sensitive to the pressure drop undergone by the gases flowing through at least a portion of said exhaust duct, by second means sensitive to the pressure drop undergone by the gases flowing through a portion of said auxiliary piping, and by a throttling member for said auxiliary piping which is driven to move by said first and said second means in the sense of keeping the sensed pressure drops proportional to each other, respectively.
  • FIG. 1 shows as a diagrammatical overall view an internal combustion engine according to the invention
  • FIG. 2 shows a cross-sectional view of a detail of FIG. 1,
  • FIGS. 3 and 4 show modifications to the detail illustrated in FIG. 2.
  • the numeral indicates an internal combustion engine having four in-line cylinders shown at 11, 12, l3, 14: the numeral 15 indicates the induction duct of the engine and 16 is the intake manifold from which branch off the individual intake ducts of the several cylinders.
  • the numeral 17 indicates the body which contains the throttling members of the fluid drawn by the engine: a mixture in the case of an engine having a carburetor, and air in the case of an injection engine.
  • the linkage mechanism of said throttling members which is known as itself, is partly shown, with the accelerator pedal of the vehicle: the drawing shows a lever 18 connected to the throttling members and a rod 19 connected to an accelerator pedal (not shown).
  • the numeral 20 indicates the filter, having also a silencing function for the air drawn from the outside by the engine.
  • a postcombustion muffler 28 and a silencer muffler 29 are arranged in the duct 27 in the duct 27.
  • the duct 31 opens into a chamber or space 37 whose constructional features are best seen in FIG. 2: the duct 30 is connected through the flange 32 to the counterflange 33 of a cylindrical section 34 which is jointed to -a duct 35 opening into the induction duct 15.
  • FIG. 2 there is shown in its constructional details the chamber 37 along with the cylindrical section 34 located between the ducts 30 and 35.
  • the arrows which show the direction of flow of the recycled gas.
  • a diaphragm having an opening 39 defining a choke or constriction whose value is fixed and which is inserted in the duct 30 by means of the flanges 32 and 33, and at 40 there is a butterfly valve pivoted at 41 to the walls of the section 34.
  • the diaphragm 45 is shifted towards a new position of equilibrium corresponding to a different position of the throttle 40, so as to maintain a constancy of the ratio between the respective rates of flow of the exhaust and the recycled gases according to the objects of the invention.
  • the device takes a particularly simple shape, as shown in FIG. 3: the face of the diaphragm which corresponds to the chamber 50, is in direct contact with the atmosphere, so that the duct 3i can be eliminated: the diaphragm 45 is in equilibrium when the pressure obtaining in the recycling duct, between the choke 39 and the throttle 40 is equal to the atmospherical pressure: that is to say that the pressure drop the gases undergo when flowing through the tube section located between the point of branching off of the duct 30 and its free opening into the atmosphere is equal to the pressure drop undergone by the recycled gases when flowing through the duct 30 from the starting point to a zone immediately downstream of the choke 39: also in this case such an equality ensures a constant ratio between the rates of flow of the exhaust gases and the recycled gases.
  • the pressure drop localized in the recycling pipe, determined by the choke 39 can be obtained in various ways or even avoided, by shaping the duct 30 in such a way that its resistance to the gas flow gives rise to a pressure drop of the desired value.
  • the obtention of the desired resistance with the use of a disc 38 having a calibrated opening permits an initial regulation of the ratio of the rates of flow which is very convenient and accurate.
  • the throttle 55 can be driven, more particularly, in the sense of being closed when the engine is required to deliver very small powers; in such a case, in fact, it is of minor importance to profit of the recycle of the exhaust gases: the mechanical linkage 57 can be connected to usual accelerator pedal 61, in the sense of closing the throttle when the pedal is released due to the bias of springs 62, or it can be controlled with a similar action by a device sensitive to the negative pressure in the intake duct of the engine, in the sense of being closed as the magnitude of the negative pressure is increased.
  • An internal combustion engine provided with an intake duct, an exhaust duct and an auxiliary piping connected to said exhaust duct to draw a portion of the gases flowing therethrough to discharge them into said intake duct, the improvement including first means sensitive to a pressure drop undergone by the gases which flow through at least a portion of the exhaust duct, second means operably related to the first means and sensitive to a predetermined pressure drop undergone by the gases when flowing through a portion of said auxiliary piping and a member for throttling in a variable manner said auxiliary piping, said member being driven by said first and said second means in the sense of keeping proportional the respectively sensed pressure drops.
  • An internal combustion engine provided with an intake duct, an exhaust duct and an auxiliary piping connected to said exhaust duct to draw a portion of the gases flowing therethrough to discharge them into said intake duct, the improvement including first means sensitive to a pressure drop undergone by the gases which flow through at least a portion of the exhaust duct, second means operably related to the first means and sensitive to a predetermined pressure drop undergone by the gases when flowing through a portion of said auxiliary piping and a member for throttling in a variable manner the auxiliary piping, said member being driven by said first and said second means in the sense of keeping proportional the respectively sensed pressure drops, said first means being sensitive to the gas pressure in a point of the exhaust duct which is downstream of the connection of the auxiliary piping to said exhaust duct and sensitive to the gas pressure at a point of said auxiliary piping which is upstream of said member, and drive said member to throttle said auxiliary piping so as to maintain the sensed pressure proportional to each other, said first means consisting of a deformable dia
  • first chamber being maintained in communication with a point of said exhaust duct which is downstream of the connection thereto of the auxiliary piping
  • the second chamber being maintained in communication with a point of said auxiliary piping
  • said diaphragm being operatively connected with said throttling member.
  • An internal combustion engine provided with an intake duct, an exhaust duct, and an auxiliary piping connected to said exhaust duct to draw a portion of the gases flowing therethrough to discharge them into said intake duct, the improvement including first means sensitive to a pressure drop undergone by the gases which flow through at least a portion of the exhaust duct, second means operably related to the first means and sensitive to a predetermined pressure drop undergone by the gases when flowing through a portion of said auxiliary piping and a member for throttling in a variable manner said auxiliary piping, said member being driven by said first and second means in the sense of keeping proportional the respectively sensed pressure drops, said exhaust duct opening into the atmosphere and said means being sensitive to the pressure at a point of said auxiliary piping and controlling said throttling means to maintain the sensed pressure in a constant proportion with respect to the atmospherical pressure, said means comprising a chamber having a wall consisting of a deformable diaphragm and in communication with a point of said auxiliary piping upstream of said member, the
  • An internal combustion engine characterized in that said member is driven to vary said resistance by a sensing member of the power delivered by the engine in the sense of diminishing the resistance as the power is increased and vice versa.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Exhaust Gas After Treatment (AREA)
US00329822A 1972-02-08 1973-02-05 Device for regulating the rate of flow of recycled exhaust gases in an internal combustion engine Expired - Lifetime US3844261A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT20344/72A IT947400B (it) 1972-02-08 1972-02-08 Dispositivo di regolazione della portata del gas di scarico ricirco lato in un motore a combustione interna

Publications (1)

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US3844261A true US3844261A (en) 1974-10-29

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US (1) US3844261A (de)
DE (1) DE2304435C2 (de)
IT (1) IT947400B (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4009689A (en) * 1975-05-02 1977-03-01 General Motors Corporation Rotary combustion engine exhaust gas recirculation system
US4014302A (en) * 1975-03-14 1977-03-29 Briggs & Stratton Corporation Device to reduce the nitrogen oxide content in the exhaust gas of an internal combustion engine
US4044735A (en) * 1975-10-22 1977-08-30 Toyota Jidosha Kogyo Kabushiki Kaisha Exhaust gas recirculation valve
US4100734A (en) * 1976-01-12 1978-07-18 Nippon Soken, Inc. Exhaust gas purification system for an internal combustion engine
US4149503A (en) * 1976-10-01 1979-04-17 Nippon Soken, Inc. Exhaust gas recirculation system for an internal combustion engine
US4164918A (en) * 1978-02-21 1979-08-21 General Motors Corporation Exhaust gas recirculation control
US4180034A (en) * 1978-05-25 1979-12-25 General Motors Corporation Exhaust gas recirculation control
US4186703A (en) * 1978-09-06 1980-02-05 General Motors Corporation Exhaust gas recirculation control
US4196707A (en) * 1978-07-31 1980-04-08 General Motors Corporation Exhaust gas recirculation control
US4205526A (en) * 1978-09-13 1980-06-03 Owens Leroy Emission control system and method for internal combustion engine
US4250711A (en) * 1975-08-29 1981-02-17 Bbc Brown, Boveri & Company, Limited Method and apparatus for supercharging an internal combustion engine
US5386690A (en) * 1992-02-25 1995-02-07 Blue Planet Technologies Co., L.P. Catalytic system
US5525316A (en) * 1992-02-25 1996-06-11 Blue Planet Technologies Co. L.P. Method for converting automotive emissions with catalytic solution

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA972642A (en) * 1972-04-17 1975-08-12 William L. Kingsbury Exhaust gas recirculation control valve
FR2443582A2 (fr) * 1978-12-05 1980-07-04 Peugeot Dispositif de recyclage des gaz d'echappement pour moteur diesel
FR2420659A1 (fr) * 1978-03-22 1979-10-19 Peugeot Dispositif de recyclage des gaz d'echappement pour moteur diesel

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3507260A (en) * 1967-05-01 1970-04-21 Brooks Walker Exhaust recirculation control for an engine
US3675633A (en) * 1969-01-20 1972-07-11 Nissan Motor Air-pollution preventive system for motor vehicles

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1601374A1 (de) * 1967-10-18 1970-04-02 Motoren Werke Mannheim Ag Selbstzuendende,luftverdichtende Brennkraftmaschine,insbesondere fuer den Betrieb mit zuendunwilligen Kraftstoffen
DE1944357A1 (de) * 1969-09-01 1971-03-18 Brooks Walker Vorrichtung zum Regeln der zurueckfuehrenden Auspuffgase bei einem Verbrennungsmotor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3507260A (en) * 1967-05-01 1970-04-21 Brooks Walker Exhaust recirculation control for an engine
US3675633A (en) * 1969-01-20 1972-07-11 Nissan Motor Air-pollution preventive system for motor vehicles

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4014302A (en) * 1975-03-14 1977-03-29 Briggs & Stratton Corporation Device to reduce the nitrogen oxide content in the exhaust gas of an internal combustion engine
US4009689A (en) * 1975-05-02 1977-03-01 General Motors Corporation Rotary combustion engine exhaust gas recirculation system
US4250711A (en) * 1975-08-29 1981-02-17 Bbc Brown, Boveri & Company, Limited Method and apparatus for supercharging an internal combustion engine
US4044735A (en) * 1975-10-22 1977-08-30 Toyota Jidosha Kogyo Kabushiki Kaisha Exhaust gas recirculation valve
US4100734A (en) * 1976-01-12 1978-07-18 Nippon Soken, Inc. Exhaust gas purification system for an internal combustion engine
US4149503A (en) * 1976-10-01 1979-04-17 Nippon Soken, Inc. Exhaust gas recirculation system for an internal combustion engine
US4164918A (en) * 1978-02-21 1979-08-21 General Motors Corporation Exhaust gas recirculation control
US4180034A (en) * 1978-05-25 1979-12-25 General Motors Corporation Exhaust gas recirculation control
US4196707A (en) * 1978-07-31 1980-04-08 General Motors Corporation Exhaust gas recirculation control
US4186703A (en) * 1978-09-06 1980-02-05 General Motors Corporation Exhaust gas recirculation control
US4205526A (en) * 1978-09-13 1980-06-03 Owens Leroy Emission control system and method for internal combustion engine
US5386690A (en) * 1992-02-25 1995-02-07 Blue Planet Technologies Co., L.P. Catalytic system
US5525316A (en) * 1992-02-25 1996-06-11 Blue Planet Technologies Co. L.P. Method for converting automotive emissions with catalytic solution

Also Published As

Publication number Publication date
DE2304435C2 (de) 1982-08-19
IT947400B (it) 1973-05-21
DE2304435A1 (de) 1973-08-16

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AS Assignment

Owner name: ALFA LANCIA S.P.A., ARESE, MILAN, ITALY, A CORP. O

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ALFA ROMEO S.P.A.;REEL/FRAME:004831/0252

Effective date: 19870930

Owner name: ALFA LANCIA S.P.A., A CORP. OF ITALY,ITALY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ALFA ROMEO S.P.A.;REEL/FRAME:004831/0252

Effective date: 19870930