US3834363A - Engine exhaust recirculation apparatus - Google Patents

Engine exhaust recirculation apparatus Download PDF

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Publication number
US3834363A
US3834363A US00281950A US28195072A US3834363A US 3834363 A US3834363 A US 3834363A US 00281950 A US00281950 A US 00281950A US 28195072 A US28195072 A US 28195072A US 3834363 A US3834363 A US 3834363A
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United States
Prior art keywords
valve
diaphragm
conduit
throttle
intake manifold
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
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US00281950A
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English (en)
Inventor
K Mizuno
K Goto
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.)
Toyota Motor Corp
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Toyota Motor Corp
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Filing date
Publication date
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Publication of US3834363A publication Critical patent/US3834363A/en
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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
    • F02M26/59—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
    • F02M26/55—Systems for actuating EGR valves using vacuum actuators
    • F02M26/58—Constructional details of the actuator; Mounting thereof
    • 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
    • F02M26/66—Lift valves, e.g. poppet valves
    • F02M26/68—Closing members; Valve seats; Flow passages

Definitions

  • An apparatus for the recirculation of exaust gases from an automobile olume corn h s engine at a constant v prising a flow control valve in a passage for recirculating part of the engine exhaust gases into the engines intake system.
  • This invention relates to a means for recirculating an engines exhaust gas, and more particularly to an improved apparatus comprising a flow control valve adapted to maintain constant the volume of exhaust gas recycled into the intake system of an automobile or the like.
  • the amount of :nitrogen oxides in automobile exhaust gases can be decresed by lowering the maximum combustion temperature of the air fuel mixture in cylinder.
  • the known exhaust recirculation devices is one in which a part of the exhaust gases, most of which are inert gases, is mixed in the fuel-air mixture to increase its heat capacity to thereby reduce the combustion temperature.
  • Most of the known flow control means used for controllingthe exhaust recycling rate in such a-device are composed substantially of a flap valve adapted to operate in response to the throttle valve in the carburetor such that as the throttle valve is turned 90 to change from .the full closed to the full open condition, the flap valve is turned 180 to change from the 'full closed to the full open and then again to the full closed condition.
  • the amount of exhaust gas which is recirculated varies with the total amount of engine exhaust gases during the above-said opening and closing operations as shown by curve a in FIG. 3.
  • FIG. 1 illustrates schematically, an engine and its exhaust recirculating system
  • FIG. 2 illustrates in cross section an embodiment of the device provided by this invention for recirculating a portion of the exhaust gas to the fuel intake system of the engine of FIG. 1;
  • FIG. 3 compares diagrammatically the relationship between the amount of exhaust gas recirculated by a prior art device with that provided by the invention.
  • FIG. 1 there is shown schematically an internal combustion engine having a conventional exhaust recirculation system including a by-pass exhaust recirculation system passage 4 provided between an exhaust pipe 2 and an intake pipe 3 both extending from an engine l.
  • a flow control means 10 is provided in accordance with the present invention in said passage 4.
  • the flow control means 10 of the present invention comprises a control valve 14 including a movable ball or similar member adapted to seat in the valve opening.
  • Valve 14 is disposed in an orthogonally bent portion of the exhaust recirculation passage or conduit 4.
  • a throttle 16 In the passage 4 and upstream of said control valve 14 is also provided a throttle 16 in such a way as to define therebetween a control chamber 17.
  • Connecting rod 15 is connected to a diaphragm 20 provided in a diaphragm assembly 18.
  • a spring 19 is mounted on one side of diaphragm 20, and a pressure conduction pipe 22 connects the control chamber 17 to a pressure chamber 21 formed in the diaphragm assembly 18.
  • a bellows 23 is secured at one end to member 13 and at the other end to passage wall 4. Bellows 23 surrounds valve body 13 and is adapted to counteract the pressure acting on the backside face of the valve body.
  • a second bellows 24 is provided at that part of the passage wall 4' where the connecting rod 15 passes to protect the sliding portion thereof from exhaust gases to keep it free from coagulation and other similar problems.
  • the pressure upstream of the throttle 16 is substantially proportional to the square of the amount of engine exhaust gas, so that eventually the amount of exhaust recycling is rendered proportional to the amount of engine exhaust gas, and thus the ratio between them is fixed always at a constant value for any amount of engine exhaust gas, as shown by a straight line b in P16. 3.
  • control valve 14 needs to be adjusted so that it is proportional to the square root of the quotient of the pressure on the upstream side of throttle l6 and the pressure on the downstream side of control valve 14 by suitably selecting the flow passage area of throttle 16, pressure-receiving area on the'diaphragm, spring setting load, spring constant and other factors.
  • the exhaust recycling rate is controlled so that the pressure just after the throttle in the exhaust recirculation passage connected between exhaust pipe 2 and intake pipe 3 of an engine 1 is kept at a fixed level, thereby to maintain always constant the rate of exhaust gas to be recirculated, regardless of the amount of engine'exhaust gas. Therefore,-even if the amount of engine exhaust gas is increased or decreased according to the automobile cruising conditions, the fuel-air ratio in the fuel supply system remains substantially unchanged, and hence the present device can be used for the above-said purpose without baffling the mixing ratio which has been set for decreasing the harmful components such as carbon monoxide, hydrocarbons, etc., in exhaust gases.
  • an apparatus for recirculating exhaust gas from an exhaust pipe to an intake manifold comprising a conduit between the intake manifold and exhaust pipe, a throttle in the conduit, a valve in the conduit downstream of the throttle, said throttle and control valve defining a control chamber therebetween, a diaphragm, a rod connecting the diaphragm and valve, means for conducting gas from the control chamber against the diaphragm and thereby move the diaphragm and open the valve under the positive pressure in the control chamber, and a bellows between the valve and intake manifold urging the valve into its closed position to offset the effect of a negative pressure in the intake manifold.
  • means for recirculating a part of the exhaust gas carried by the exhaust pipe to the intake manifold comprising a first conduit communicating between said intake manifold and said exhaust pipe, a throttle in said first conduit, a control valve in said first conduit downstream of the throttle and having a valve seat and a valve body adapted to seat in the valve seat, a valve rod secured to the downstream side of the valve body and slidably supported in said first conduit, a connecting rod secured at one end to the upstream'side of the valve body and at its other end to a diaphragm, a housing enclosing the diaphragm and a chamber separated into two compartments by the diaphragm, a second conduit communicating at one end with said.
  • first conduit between the throttle'and the valve seat and slidably conthrottle and valve seat is conducted through said second conduit into the compartment opposite the diaphragm from the valveseat and the diaphragm and said rod are moved against said biasing means in response to the pressure in said chamber.

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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)
  • Control Of Non-Electrical Variables (AREA)
US00281950A 1972-04-17 1972-08-18 Engine exhaust recirculation apparatus Expired - Lifetime US3834363A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1972044289U JPS5038653Y2 (enrdf_load_stackoverflow) 1972-04-17 1972-04-17

Publications (1)

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US3834363A true US3834363A (en) 1974-09-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00281950A Expired - Lifetime US3834363A (en) 1972-04-17 1972-08-18 Engine exhaust recirculation apparatus

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US (1) US3834363A (enrdf_load_stackoverflow)
JP (1) JPS5038653Y2 (enrdf_load_stackoverflow)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS492920U (enrdf_load_stackoverflow) * 1972-04-17 1974-01-11
US3931813A (en) * 1972-07-26 1976-01-13 Nissan Motor Company Limited Exhaust gas recirculation control device
USB480384I5 (enrdf_load_stackoverflow) * 1973-07-25 1976-03-23
US3961608A (en) * 1972-11-11 1976-06-08 Robert Bosch G.M.B.H. Valve for controlling the flow of combustion gases in a combustion engine
US4009689A (en) * 1975-05-02 1977-03-01 General Motors Corporation Rotary combustion engine exhaust gas recirculation system
US4036191A (en) * 1974-11-05 1977-07-19 Nippondenso Co., Ltd. Exhaust gas recirculation system
US4041698A (en) * 1975-06-03 1977-08-16 Kommanditbolaget United Stirling (Sweden) Ab & Co. External combustion engine with exhaust gas recirculation of constant mass flow rate
US4044735A (en) * 1975-10-22 1977-08-30 Toyota Jidosha Kogyo Kabushiki Kaisha Exhaust gas recirculation valve
US4048968A (en) * 1975-07-17 1977-09-20 Nissan Motor Company, Limited Exhaust gas recirculation system
US4130094A (en) * 1977-08-03 1978-12-19 Ford Motor Company Exhaust gas recirculation valve assembly
US4158351A (en) * 1976-12-14 1979-06-19 Toyota Jidosha Kogyo Kabushiki Kaisha Flow control valve for an exhaust gas recirculation apparatus of an exhaust gas pressure control type
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
US4186702A (en) * 1978-06-02 1980-02-05 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
US4203399A (en) * 1977-07-11 1980-05-20 Nippondenso Co., Ltd. Exhaust gas recirculation system
US5351669A (en) * 1993-01-22 1994-10-04 Metallwarenfabrik Schelklingen Gmbh Valve device for exhaust gas feedback in an internal combustion engine
US6095123A (en) * 1999-01-11 2000-08-01 Ford Global Technologies, Inc. Valve and valve control method
US20050028797A1 (en) * 2003-08-08 2005-02-10 Janssen John M. Dual mode EGR valve
US20100276226A1 (en) * 2002-09-08 2010-11-04 Guobiao Zhang Muffler

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5151427A (ja) * 1974-10-30 1976-05-07 Kubota Ltd Konbainniokeruntendaizasekino chosetsusochi
JPS5743090Y2 (enrdf_load_stackoverflow) * 1977-12-22 1982-09-22

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1051690A (en) * 1912-02-09 1913-01-28 James M Colwell Internal-combustion engine.
US1502772A (en) * 1921-03-07 1924-07-29 Oliver J Savin Apparatus for improving and increasing the useful results obtainable from gasoline or other fuel in internal-combustion engines and the like
US3241536A (en) * 1964-11-27 1966-03-22 James P Malone Anti-smog means
US3713428A (en) * 1970-03-11 1973-01-30 Volkswagenwerk Ag Exhaust gas return means for internal combination engines
US3717131A (en) * 1971-11-10 1973-02-20 Gen Motors Corp Intake manifold for exhaust gas recirculation
US3749071A (en) * 1972-04-19 1973-07-31 Gen Motors Corp Exhaust gas recirculation control valve
US3756210A (en) * 1972-04-10 1973-09-04 Gen Motors Corp Exhaust gas recirculation control valve

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS493019A (enrdf_load_stackoverflow) * 1972-04-10 1974-01-11
JPS5038653Y2 (enrdf_load_stackoverflow) * 1972-04-17 1975-11-08

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1051690A (en) * 1912-02-09 1913-01-28 James M Colwell Internal-combustion engine.
US1502772A (en) * 1921-03-07 1924-07-29 Oliver J Savin Apparatus for improving and increasing the useful results obtainable from gasoline or other fuel in internal-combustion engines and the like
US3241536A (en) * 1964-11-27 1966-03-22 James P Malone Anti-smog means
US3713428A (en) * 1970-03-11 1973-01-30 Volkswagenwerk Ag Exhaust gas return means for internal combination engines
US3717131A (en) * 1971-11-10 1973-02-20 Gen Motors Corp Intake manifold for exhaust gas recirculation
US3756210A (en) * 1972-04-10 1973-09-04 Gen Motors Corp Exhaust gas recirculation control valve
US3749071A (en) * 1972-04-19 1973-07-31 Gen Motors Corp Exhaust gas recirculation control valve

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS492920U (enrdf_load_stackoverflow) * 1972-04-17 1974-01-11
US3931813A (en) * 1972-07-26 1976-01-13 Nissan Motor Company Limited Exhaust gas recirculation control device
US3961608A (en) * 1972-11-11 1976-06-08 Robert Bosch G.M.B.H. Valve for controlling the flow of combustion gases in a combustion engine
USB480384I5 (enrdf_load_stackoverflow) * 1973-07-25 1976-03-23
US3999737A (en) * 1973-07-25 1976-12-28 Toyota Jidosha Kogyo Kabushiki Kaisha Flow control valve for exhaust gas purifying system
US4036191A (en) * 1974-11-05 1977-07-19 Nippondenso Co., Ltd. Exhaust gas recirculation system
US4009689A (en) * 1975-05-02 1977-03-01 General Motors Corporation Rotary combustion engine exhaust gas recirculation system
US4041698A (en) * 1975-06-03 1977-08-16 Kommanditbolaget United Stirling (Sweden) Ab & Co. External combustion engine with exhaust gas recirculation of constant mass flow rate
US4048968A (en) * 1975-07-17 1977-09-20 Nissan Motor Company, Limited Exhaust gas recirculation system
US4044735A (en) * 1975-10-22 1977-08-30 Toyota Jidosha Kogyo Kabushiki Kaisha Exhaust gas recirculation valve
US4158351A (en) * 1976-12-14 1979-06-19 Toyota Jidosha Kogyo Kabushiki Kaisha Flow control valve for an exhaust gas recirculation apparatus of an exhaust gas pressure control type
US4203399A (en) * 1977-07-11 1980-05-20 Nippondenso Co., Ltd. Exhaust gas recirculation system
US4130094A (en) * 1977-08-03 1978-12-19 Ford Motor Company Exhaust gas recirculation valve assembly
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
US4186702A (en) * 1978-06-02 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
US4186703A (en) * 1978-09-06 1980-02-05 General Motors Corporation Exhaust gas recirculation control
US5351669A (en) * 1993-01-22 1994-10-04 Metallwarenfabrik Schelklingen Gmbh Valve device for exhaust gas feedback in an internal combustion engine
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
US20100276226A1 (en) * 2002-09-08 2010-11-04 Guobiao Zhang Muffler
US8079441B2 (en) * 2002-09-08 2011-12-20 Guobiao Zhang Muffler
US20050028797A1 (en) * 2003-08-08 2005-02-10 Janssen John M. Dual mode EGR valve
US6964270B2 (en) 2003-08-08 2005-11-15 Cummins, Inc. Dual mode EGR valve

Also Published As

Publication number Publication date
JPS492920U (enrdf_load_stackoverflow) 1974-01-11
JPS5038653Y2 (enrdf_load_stackoverflow) 1975-11-08

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