US3842814A - Exhaust gas recirculation system - Google Patents

Exhaust gas recirculation system Download PDF

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Publication number
US3842814A
US3842814A US00315346A US31534672A US3842814A US 3842814 A US3842814 A US 3842814A US 00315346 A US00315346 A US 00315346A US 31534672 A US31534672 A US 31534672A US 3842814 A US3842814 A US 3842814A
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United States
Prior art keywords
vacuum
valve
exhaust gas
engine
source
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Expired - Lifetime
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US00315346A
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English (en)
Inventor
K Bier
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Colt Industries Operating Corp
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Colt Industries Operating Corp
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Publication date
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Priority to US00315346A priority Critical patent/US3842814A/en
Priority to CA187,434A priority patent/CA1007943A/en
Priority to DE2362359A priority patent/DE2362359A1/de
Priority to JP48139325A priority patent/JPS4996133A/ja
Application granted granted Critical
Publication of US3842814A publication Critical patent/US3842814A/en
Anticipated expiration legal-status Critical
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
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/55—Systems for actuating EGR valves using vacuum actuators
    • 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
    • F02M2026/001—Arrangements; Control features; Details
    • F02M2026/002—EGR valve being controlled by vacuum or overpressure
    • 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
    • F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities

Definitions

  • An exhaust gas recirculation system for recirculating a portion of the engine developed exhaust gases back to the intake of the engine has a variably openable first 12%] valve for permitting Such exhaust gas recirculaticn, d i
  • References cued applying such low pressure to the motor assembly for UNITED STATES PATENTS actuation thereof, and pressure bleeding control valv- 2,419,747 4/ 1947 Wassman 123/119
  • a ing means positioned in accordance with the position 2,969,800 l/l96l Skirvin et al.
  • FIG. 1 illustrates an induction device in combination with an exhaust gas recirculation system constructed in accordance with the teachings of the invention
  • FIG. 2 is a graph depicting some characteristic operating curves obtainable by the system of the invention.
  • FIG. 1 illustrates a carburetor having body means 12 with an induction passage 14 formed therethrough having an inlet end 16 and a discharge end 18.
  • the induction passage 14 may be provided with a venturi 20.
  • a booster-type main fuel discharge nozzle is depicted at 22.
  • Suitable lever means 32 are provided for variably positioning the throttle valve 24.
  • Valving means 33 comprised of a chamber 34 slideably containing a valve member 36, having a suitably contoured valving surface 38, which is resiliently urged into seated engagement against a cam member 40 as by a compression spring 42.
  • Cam 40 is illustrated as being fixedly secured directly to throttle shaft 26. However, it should be apparent that the cam 40 may equally well be physically separated from throttle shaft 26 and merely operatively connected thereto so as to be positioned in accordance therewith as will become obvious.
  • valve member 36 is moved upwardly as to cause metering surface 38 to either seat against or achieve a particular predetermined relationship with respect to a cooperating seating or metering surface 42.
  • Conduit means 44 in communication with chamber 34 via orifice means 42, communicates with a pressure responsive motor assembly 46 which, as illustrated, may be comprised of a housing assembly 48 having housing section 50 and 52 cooperatively peripherally retaining therebetween a moveable wall or diaphragm 54 so as to define, at opposite sides thereof distinct but variable chambers 56 and 58. Housing section 52 is provided with suitable venting apertures 60 so as to place chamber 58 in free communication with the ambient atmosphere.
  • the body or housing assembly 48 is suitably secured to and carried by a related housing or body 70 which defines a passage 72 therein communicating as between ports or orifices 74 and 76 with port 76 being considered as the inlet to passage 72 and port 74 being considered the outlet from passage 72.
  • a spring 78 situated within chamber 56 normally urges diaphragm 54 and valve member 68 toward seated or closed engagement with a cooperating surface of port 76 as to thereby prevent flow therethrough.
  • the body 70 is illustrated as being situated atop a first conduit defining member or structure 80 and a second conduit-defining member or structure 82.
  • Structure 80 may, in fact, be formed integrally with the induction manifold 30; however, in any event the con duit portion 84 formed within structure 80 is in communication with intake passage 28 of intake manifold 30 so as to thereby have the same pressure existing therein as within the intake manifold 30.
  • Porting or passage means 86 serves to complete communication between port 74 and conduit 84.
  • Structure 82 may, in fact, be formed integrally with the engine exhaust system so as to have the conduit portion 88 define therein in communication with or forming a portion of the exhaust passageway means of such exhaust system.
  • Port 90 located at any suitable place with regard to such exhaust system, is effective for completing communication as between exhaust passage means 88 and inlet port 76.
  • valve member 68 when valve member 68 is moved in an opening direction away from port or inlet 76, some portion of the exhaust gases within exhaust conduit means 88 flows through ports 90, 76 into chamber or passage 72 and through outlet 74, port 86 and into intake passage means 84 leading to the associated engine.
  • a housing 92 defining a chamber 94 which, as will become apparent, serves as a reservoir of relatively low pressure or vacuum, is placed in communication with conduit 44 as by conduit means 96.
  • Additional conduit means 98 which may include a ball check valve 100 and a spring 102, communicates with chamber 94 as through a port 104 in the wall of housing 92.
  • the other end of conduit means 98 is placed in communication with a suitable source of engine or intake manifold vacuum as generally depicted at 106.
  • Suitable restriction means 108 provided generally between chamber 94 and conduit means 44 provides for a control on the rate of flow from conduit 44 to chamber 94.
  • conduit means 110 is provided as between valving chamber 36 and a suitable source of ambient air as, for example, the inlet 17 of the induction passage means 14. Even though illustrated as communicating with inlet 16, it should be apparent that such is done primarily for purposes of disclosing the concept and that conduit means 110 may communicate with any suitable source of ambient atmosphere as well as any other higher pressure source.
  • the pressure within chamber 56 will be referred to as, P,; the pressure of the source of ambient atmospheric pressure is identified as, P the pressure within chamber 94 is identified as, P the pressure within intake manifold is identified as, P and the pressure within the exhaust manifold or passage means 88 is identified as, P,;. Further, even though this relationship may not be totally true for all conditions of engine operation, the degree to which pressure P may exceed the magnitude of pressure P is usually so small that for all practical purposed pressures P and P, may be considered as being equal.
  • pressure P and P will be greater than P (with pressure P being a variable dependent upon engine load and/or the degree of opening of throttle 24); pressure P will be determined by the volumetric capacity of chamber 94, the magnitude of pressure P and the degree of flow as between bleed metering surfaces 38 and 42 of the valving assembly 33; and pressure P, will be dependent upon the magnitude of P and the degree of air bleed by valving assembly 33.
  • the value of pressure P may vary, in terms of a vacuum ready, as much as from 5.0 inches of Hg to 14.0 inches of Hg (during the previous referred to range of manifold pressures) and still be suitable for practicing the invention.
  • the said range of 5.0 to 14.0 inches of Hg is, of course, not by way of limitation but rather by way of example.
  • cam 40 causes valve 36 to be progressively moved closer to orifice means 42 thereby resulting in orifice means 42 and contoured valving surface 38 combining to restrict the flow of bleed air from passage means 110 into conduit means 44. Because of such restriction to flow of bleed air and because of the flow through restriction means 108 due to reservoir 92 the pressure P,, therein and the manifold pressure P the value of the signal or actuating pressure P, diminishes in magnitude causing, as previously explained, diaphragm 54 to start to move upwardly and, in turn, start to move valve member 68 away from orifice and seat 76.
  • valve 68 which is a metering type valve because of the selected contour thereof, opens is, of course, dependent upon the degree to which the magnitude of pressure P, has been reduced.
  • exhaust valve 68 As exhaust valve 68 is opened, exhaust gases are permitted to flow from exhaust passage means 88, through ports 90, 76, through conduit means 72, ports 74 and 86 and into engine intake passage means. 84.
  • the de gree of such exhaust gas recirculation will be controlled by the degree to which exhaust gas recirculation valve 68 is opened.
  • valve 68 can be prevented from opening by either the degree of preload force applied'by spring 78, or the degree of bleed air permitted by valving assembly 33 or a combination of both Depending on the size and type of engine employed, in some applications it is desireable to have exhaust gas recirculation terminate during only wide open throttle operating conditions while in other applications it is desireable to have such exhaust gas recirculation terminate substantially in advance of when wide open throttle operation is attained, or even to continue some degree of recirculation at wide open throttle.
  • point 112 represents curb-idle throttle position and point 114 represents wide open throttle position that the volume rate of exhaust gas flow will increase, linearly, to some maximum point as at 116 after which it quickly reduces in volume rate of flow finally becoming completely terminated as at point 114.
  • the shape of the portion of the curve between points 116 and 114 may be of any desired characteristic such as, for example, shown by the dash-line between points 116 and 114. This may be achieved by use of any of the variables within the system including, for example, the contouring of cam 40 so as to cause valving member 36 to move away from cooperating bleed orifice 42 as throttle valve 24 is approaching its wide open position.
  • the invention is not limited to a performance characteristic as represented by the straight line portion between points 112 and 120 of FIG. 2. That is, by selection of the various constants in the system it is possible to achieve any other desired performance curve such as depicted, for example, by phantom line curves 113 or 115. Further, it should be apparent that even though a straight line characteristic curve such as that between points 112 and is employed it does not necessarily mean that the percentage of exhaust gas recirculation must be straight line function with regard to the total air flow through induction passage 14, since such can be modified by tailoring of the contours of, for example, valve 68 and valve seat passage 76.
  • the invention as herein disclosed, provides a system which can be employed to provide exhaust gas recirculation to the associated engine in any desired relationship to engine operation. Also, the invention provides a throttle position responsive exhaust gas recirculation system wherein the exhaust recirculation valve and the throttle valve are not mechanically coupled, thereby eliminating the possibility of the throttle valve being held open by a stuck recirculation valve. Further, it is obvious that by varying the contours of the control valve 36, or the recirculation valve 68, or the contour of cam 40 or by varying the spring rates of spring means 78 (including the possibility of providing a secondary spring engageable only after predetermined movement of valve 68) or the size of restriction means 108, that a high degree of calibration flexibility may be obtained.
  • An exhaust gas recirculation system for an internal combustion engine having first conduit means for conducting from said engine at least part of the exhaust gases generated by said engine and second intake conduit means controlled by a variably openable throttle valve for conducting therethrough a flow of atmospheric air to said engine for supporting the combustion process within said engine, said system comprising passage means interconnecting and communicating between said first and second conduit means, variably p0- sitionable valve means for controlling the flow of said exhaust gases from said first conduit means through said passage means and into said second conduit means, vacuum responsive motor means operatively connected to said variably positionable valve means for causing said variably positionable valve means to move in an opening direction in response to an actuating vacuum being communicated to said vacuum responsive motor means, a source of vacuum, third conduit means communicating with said source of vacuum and said vacuum responsive motor means, and variably openable control valve means communicating between a source of ambient pressure and said vacuum responsive motor means, said variably openable control valve means being openable generally in accordance with the degree of opening of said throttle valve, said control valve means being positioned in accordance
  • An exhaust gas recirculation system according to claim 1 and further comprising cam means operatively connected to said throttle valve for being positioned in accordance with the piston of said throttle valve, and wherein said control valve means is operatively engageable with said cam means for being moved toward and away from a closed position in accordance with the position of said cam means.
  • An exhaust gas recirculation system according to claim 1 and further comprising restriction means situated serially between said source of vacuum and said vacuum responsive motor means so as to at least at times restrict the degree of communication therebetween.
  • An exhaust gas recirculation system according to claim 1 and further comprising fourth conduit means adapted for communication as between said source of vacuum and a source of engine generated vacuum within said intake conduit means downstream of said throttle valve.
  • An exhaust gas recirculation system wherein the magnitude of said actuating vacuum more nearly approaches the magnitude of said engine generated vacuum within said intake conduit means whenever said control valve means is more nearly closed as to reduce the degree of said bleed as between said source of ambient pressure and said vacuum responsive motor means.
  • An exhaust gas recirculation system according to claim 4 and further comprising check valve means situated generally in said fourth conduit means and serially between said source of vacuum and said intake conduit means.
  • vacuum responsive motor means comprises a vacuum responsive diaphragm operatively connected to said variably positionable valve means.
  • variably openable control valve means is openable generally inversely in accordance with the degree of opening of said throttle valve so as to generally further restrict communication between said ambient pressure and said vacuum responsive motor means as said throttle valve is moved toward a more opened position, and wherein said control valve means is effective to at least at times provide a controlled degree of bleed as between said source of ambient pressure and said vacuum responsive motor in order to thereby reduce the magnitude of said vacuum from said source of vacuum and thereby create said atuating vacuum.
  • control by said passage valve controlling means is independent of the specific value of intake conduit vacuum.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
US00315346A 1972-12-15 1972-12-15 Exhaust gas recirculation system Expired - Lifetime US3842814A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US00315346A US3842814A (en) 1972-12-15 1972-12-15 Exhaust gas recirculation system
CA187,434A CA1007943A (en) 1972-12-15 1973-12-05 Exhaust gas recirculation system
DE2362359A DE2362359A1 (de) 1972-12-15 1973-12-14 Vorrichtung zum umwaelzen von abgasen fuer eine verbrennungskraftmaschine
JP48139325A JPS4996133A (enrdf_load_stackoverflow) 1972-12-15 1973-12-15

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00315346A US3842814A (en) 1972-12-15 1972-12-15 Exhaust gas recirculation system

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US3842814A true US3842814A (en) 1974-10-22

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US00315346A Expired - Lifetime US3842814A (en) 1972-12-15 1972-12-15 Exhaust gas recirculation system

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US (1) US3842814A (enrdf_load_stackoverflow)
JP (1) JPS4996133A (enrdf_load_stackoverflow)
CA (1) CA1007943A (enrdf_load_stackoverflow)
DE (1) DE2362359A1 (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3941113A (en) * 1973-11-28 1976-03-02 Societe Anonyme De Vehicules Industriels Et D'equipement Mecaniques Saviem Multicylinder heat engines
US4009700A (en) * 1973-05-10 1977-03-01 A. Pierburg Autogeratebau Kg Control arrangement for the reconveyance of exhaust gases
US4030463A (en) * 1973-08-04 1977-06-21 Daimler-Benz Aktiengesellschaft Internal combustion engine with return line for exhaust gases
US4033306A (en) * 1974-06-11 1977-07-05 Nissan Motor Co., Ltd. Exhaust gas recirculation system
US4080941A (en) * 1976-01-16 1978-03-28 Automobiles Peugeot Device for recycling the exhaust gases of an internal combustion engine
US4190031A (en) * 1977-05-11 1980-02-26 Automobiles Peugeot Devices for re-cycling the exhaust gases of an internal combustion engine
US4351303A (en) * 1980-09-22 1982-09-28 Tierney Raymond J Manually adjustable valve means for an exhaust gas recirculation system
DE3400313A1 (de) * 1983-01-10 1984-07-19 Ford-Werke AG, 5000 Köln Vorrichtung zur rezirkulationsregelung der auspuffgase eines dieselmotors
US4492209A (en) * 1981-06-05 1985-01-08 Honda Giken Kogyo Kabushiki Kaisha Exhaust gas recirculation system
US6095123A (en) * 1999-01-11 2000-08-01 Ford Global Technologies, Inc. Valve and valve control method
US20180128192A1 (en) * 2016-11-04 2018-05-10 Toyota Jidosha Kabushiki Kaisha Control apparatus for internal combustion engine

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5416982Y2 (enrdf_load_stackoverflow) * 1975-06-20 1979-07-02
JPS5632600Y2 (enrdf_load_stackoverflow) * 1975-11-25 1981-08-03
GB1575606A (en) * 1976-02-20 1980-09-24 Exxon Research Engineering Co Reducing the pollutant level in exhaust gases from internal combustion engines
AU6941681A (en) * 1980-05-05 1981-11-12 Eaton Corporation Fluid pressure signal controller
JPS5728855A (en) * 1980-07-29 1982-02-16 Toyota Motor Corp Run-on preventing method for engine
DE3316219C1 (de) * 1983-05-04 1984-07-12 Pierburg Gmbh & Co Kg, 4040 Neuss Steuereinrichtung fuer die Rueckfuehrung von Abgas in die Ansaugleitung einer Brennkraftmaschine

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4009700A (en) * 1973-05-10 1977-03-01 A. Pierburg Autogeratebau Kg Control arrangement for the reconveyance of exhaust gases
US4030463A (en) * 1973-08-04 1977-06-21 Daimler-Benz Aktiengesellschaft Internal combustion engine with return line for exhaust gases
US3941113A (en) * 1973-11-28 1976-03-02 Societe Anonyme De Vehicules Industriels Et D'equipement Mecaniques Saviem Multicylinder heat engines
US4033306A (en) * 1974-06-11 1977-07-05 Nissan Motor Co., Ltd. Exhaust gas recirculation system
US4080941A (en) * 1976-01-16 1978-03-28 Automobiles Peugeot Device for recycling the exhaust gases of an internal combustion engine
US4190031A (en) * 1977-05-11 1980-02-26 Automobiles Peugeot Devices for re-cycling the exhaust gases of an internal combustion engine
US4351303A (en) * 1980-09-22 1982-09-28 Tierney Raymond J Manually adjustable valve means for an exhaust gas recirculation system
US4492209A (en) * 1981-06-05 1985-01-08 Honda Giken Kogyo Kabushiki Kaisha Exhaust gas recirculation system
DE3400313A1 (de) * 1983-01-10 1984-07-19 Ford-Werke AG, 5000 Köln Vorrichtung zur rezirkulationsregelung der auspuffgase eines dieselmotors
US4479473A (en) * 1983-01-10 1984-10-30 Ford Motor Company Diesel engine emission control system
US6095123A (en) * 1999-01-11 2000-08-01 Ford Global Technologies, Inc. Valve and valve control method
US6253749B1 (en) * 1999-01-11 2001-07-03 Ford Global Technologies, Inc. Valve and valve control method
US20180128192A1 (en) * 2016-11-04 2018-05-10 Toyota Jidosha Kabushiki Kaisha Control apparatus for internal combustion engine
US10731576B2 (en) * 2016-11-04 2020-08-04 Toyota Jidosha Kabushiki Kaisha Control apparatus for internal combustion engine

Also Published As

Publication number Publication date
DE2362359A1 (de) 1974-06-20
CA1007943A (en) 1977-04-05
JPS4996133A (enrdf_load_stackoverflow) 1974-09-11

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