US3916857A - Means for controlling the exhaust recirculation - Google Patents

Means for controlling the exhaust recirculation Download PDF

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Publication number
US3916857A
US3916857A US383053A US38305373A US3916857A US 3916857 A US3916857 A US 3916857A US 383053 A US383053 A US 383053A US 38305373 A US38305373 A US 38305373A US 3916857 A US3916857 A US 3916857A
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United States
Prior art keywords
lever
engine
recirculation
valve
detecting
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
US383053A
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English (en)
Inventor
Noriho Naito
Yutaka Kawashima
Akira Masuda
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Denso Corp
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NipponDenso Co Ltd
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Publication date
Application filed by NipponDenso Co Ltd filed Critical NipponDenso Co Ltd
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Publication of US3916857A publication Critical patent/US3916857A/en
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    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
    • 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
    • F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
    • 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
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • ABSTRACT In internal combustion engines, a means for controlling exhaust recirculation in such a manner as to increase and decrease the rate of recirculation as the load on the engine decreases and increases respectively while the engine is running continuously at high or normal speed, and to cut off the recirculation under conditions of acceleration, engine braking, and low revolution slower than a predetermined speed.
  • This invention relates to an exhaust recirculation systems for internal combustion engines and more particularly to a means forcontrolling the recirculation of exhaust gases in such systems.
  • NOx is mainly produced at high tempera ture of combustion chamber, which follows continuous runnings at normal or high speed of the engine, and it is particularly effective to have the exhaust gas return to air inlet for recirculation so as to minimize the NOx density.
  • the thickness of the smoke which tends to increase as the engine load increases, will be enhanced to an unallowable extent if the recirculation is uncontrolled for varying engine load at continuous running.
  • a means for controlling the recirculation of exhaust gases comprising, a control valve provided at intermediate of the recirculation passage, an interlocking means adapted for decreasing the opening degree of said control valve when acceleration lever is moved towards the maximum power position and increasing said opening degree when the acceleration lever is moved towards the minimum power position, and a means for closing said control valve freely from said interlocking means upon detecting that the engine is under one of conditions of acceleration, engine braking, and low revolutions slower than a predetermined value.
  • the interlocking means comprises a cam operable by acceleration lever, and a connecting link mechanism having at one end a cam follower for engagement with said cam and linked to the control valve at the other end.
  • the means for closing control valve may comprise an electro-magnetical means adapted for closing said control valve when energized, a first detecting means for allowing energization of said electro-magnetical means upon detecting an abrupt movement of accelerator lever for accelerating engine, a second detecting means for allowing said energization upon detecting that the acceleration upon detecting that the acceleration lever is at almost released position, a third detecting means for allowing said energization upon detecting that the engine revolution is slower than a predetermined value.
  • FIG. 1 is a schematic view of a means for controlling exhaust recirculation according to invention.
  • FIG. 2 is a graph showing the relationship between the thickness of the exhaust smoke and the rate of the recirculating exhaust gases.
  • FIG. 3 is a graph showing a desirable relationship between angle of accelerating lever and angle of control valve lever.
  • a control valve 2 is provided at intermediate of the recirculation passage 4 which is connecting the exhaust side to the suction side of the engine, to control the flow rate of the recirculating gases.
  • the opening degree of said control valve 2 is adapted to be changed by the motion of acceleration lever 8 through the medium of a cam 5 linked to said acceleration lever 8, and of a control valve lever 3 linked to the control valve 2 at one end with a cam follower at the other end for engagement with said cam 5.
  • the interlocking means as written above operates so as to decrease the opening degree of the control valve 2 when the acceleration lever 8 is moved towards the maximum power position, and to increase said opening degree when said lever 8 is moved toward the minimum power position.
  • the control valve 2 is closed independent of the angle 6 of the accelerating lever 8, upon energizing of the electro-magnetic coil 12 which is adapted to be energized on closing of any one switch of first switch 6, the second switch 9, and the third switch (not shown) which is controlled by a computor 11.
  • a computor 11 One such suitable computer is described in Japanese utility model publication 18/75/71 published June 25, 1971, and entitled Compressor Controlling Device.”
  • the first switch 6 is closed by an abrupt movement of the accelerating lever 8 towards the maximum power position through the medium of a conventional dashpot 7 which does not transfer a gradual movement of the accelerating lever 8.
  • a computor l1 permits energization of electromagnetic coil 12 by closing the third switch when the engine is slower than a predetermined speed, on receipt of electric signals from a revolution detecting electromagnetic pickup 10.
  • control valve 2 is kept opening to permit the recirculation of exhaust gases while the engine is continuously running at normal or at high speed, so that the density of NOx is greatly reduced.
  • the computor and the electromagnetic pickup in the embodiment may be substituted by a conventional mechanical switches as equipped with fly weights to produce any centrifugal force in accordance with the revolution.
  • the computor ll acts to cut off the recirculation so that the exhaust smoke thickness does never get higher.
  • the means for controlling the exhaust recirculation of the present invention enables it to minimize the emission of NOx without being accompanied by incrassation of HC and NO densities and exhaust smoke thickness and by unfavourable decrease of accelerating power, by adopting the exhaust recirculation system.
  • the means for closing control valve may comprise a diaphragm adapted for closing said control valve when the suction vacuum of the engine is applied thereto, and a electro-magnetic valve for permitting said application of suction vacuum when the switches
  • a device for controlling an exhaust gase recirculation system in an internal combustion engine having a recirculation passage communicating an exhaust side of the engine and a suction side for recirculation of exhaust gases comprising:
  • a recirculation control valve mounted in said passage for varying the flow rate of recirculating gases
  • an acceleration lever having a position which determines engine power
  • interlocking means connecting said acceleration lever and control valve so that the flow rate is varied as a function of the lever position
  • cam means coupled to said lever and valve for decreasing the opening of said valve and the flow rate when said lever is moved toward the maximum power position and increasing the opening of said valve and the flow rate when said lever is moved toward the minimum power position
  • control means connected to each of said detecting and producing means for closing said valve to substantially prevent flow of recirculating gases whenever an actuating signal is produced.
  • control means includes an electromagnetic coil having portion connected to said valve for closing said valve when said actuating signal is produced.
  • a device as in claim 4, wherein said rate of movement detecting and producing means includes a dashpot connecting said lever to one of said switches so as to actuate said one switch when said rate exceeds said predetermined value.
  • said engine braking detecting and producing means includes a switch positioned to be actuated when said lever is in the minimum power position.

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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)
US383053A 1972-08-31 1973-07-27 Means for controlling the exhaust recirculation Expired - Lifetime US3916857A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8727872A JPS5429652B2 (enrdf_load_stackoverflow) 1972-08-31 1972-08-31

Publications (1)

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US3916857A true US3916857A (en) 1975-11-04

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Country Status (2)

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US (1) US3916857A (enrdf_load_stackoverflow)
JP (1) JPS5429652B2 (enrdf_load_stackoverflow)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4020809A (en) * 1975-06-02 1977-05-03 Caterpillar Tractor Co. Exhaust gas recirculation system for a diesel engine
US4075994A (en) * 1972-06-02 1978-02-28 Texaco Inc. Internal combustion engine operation utilizing exhaust gas recirculation
US4085718A (en) * 1976-02-06 1978-04-25 Daimler-Benz Aktiengesellschaft Exhaust gas return system for auto-igniting internal combustion engines
US4157081A (en) * 1977-01-18 1979-06-05 Nissan Diesel Motor Co., Ltd. Recirculated exhaust gas control device for use in a diesel engine
US4181109A (en) * 1977-05-16 1980-01-01 Nissan Diesel Kogyo Company, Ltd. Exhaust gas recirculation apparatus
US4192267A (en) * 1978-09-22 1980-03-11 Texaco Inc. Exhaust gas recycling in an internal combustion engine
US4196708A (en) * 1977-12-01 1980-04-08 Lucas Industries Limited Engine systems
DE2939805A1 (de) * 1978-10-09 1980-04-24 Nissan Motor Steuersystem fuer die abgasrueckfuehrung bei dieselmotoren
US4206730A (en) * 1978-09-22 1980-06-10 Texaco Inc. Method for recycling exhaust gas from an internal combustion engine
US4231337A (en) * 1978-04-28 1980-11-04 Hitachi, Ltd. Air intake system for diesel engine
US4269159A (en) * 1978-10-12 1981-05-26 Lucas Industries Limited Engine system
US4286566A (en) * 1979-06-08 1981-09-01 Lucas Industries Limited Engine system
US4313415A (en) * 1979-06-14 1982-02-02 Nissan Motor Co., Ltd. Exhaust gas recirculation system in compression-ignition internal combustion engine
US4349004A (en) * 1980-10-22 1982-09-14 Nissan Diesel Kogyo Kabushiki Kaisha Exhaust gas recirculation apparatus for diesel engine
US4369753A (en) * 1980-07-25 1983-01-25 Toyota Jidosha Kogyo Kabushiki Kaisha Pressure mediated diesel engine exhaust gas recirculation control system
DE3400313A1 (de) * 1983-01-10 1984-07-19 Ford-Werke AG, 5000 Köln Vorrichtung zur rezirkulationsregelung der auspuffgase eines dieselmotors
EP0484656A3 (en) * 1990-11-06 1992-07-29 Firma Carl Freudenberg Device for metering exhaust gases into the combustion chamber of an internal combustion engine
US5531205A (en) * 1995-03-31 1996-07-02 Siemens Electric Limited Rotary diesel electric EGR valve
AT411545B (de) * 2001-05-14 2004-02-25 Man Steyr Ag Brennkraftmaschine in einem fahrzeug mit einer motorbremsvorrichtung und einer abgasrückführeinrichtung

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4965417A (enrdf_load_stackoverflow) * 1972-10-31 1974-06-25
US3883089A (en) * 1973-10-29 1975-05-13 American Safety Equip Safety belt device
JPS5683655U (enrdf_load_stackoverflow) * 1979-11-30 1981-07-06
JPS5692737U (enrdf_load_stackoverflow) * 1979-12-19 1981-07-23
JPS59141959A (ja) * 1983-02-03 1984-08-14 タカタ株式会社 小型緊急時ロツク式シ−トベルトリトラクタ−
JPS59141960A (ja) * 1983-02-03 1984-08-14 タカタ株式会社 緊急時ロツク式シ−トベルトリトラクタ−用メインパウル係合装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2787989A (en) * 1956-03-19 1957-04-09 Fred E Mckinley Dual solenoid controlled apparatus for preventing release of contaminants from an internal combustion engine
US3507260A (en) * 1967-05-01 1970-04-21 Brooks Walker Exhaust recirculation control for an engine
US3605709A (en) * 1969-03-19 1971-09-20 Nissan Motor Vehicular air-pollution preventive system
US3610219A (en) * 1970-05-22 1971-10-05 Gen Motors Corp Exhaust gas recirculation control
US3675633A (en) * 1969-01-20 1972-07-11 Nissan Motor Air-pollution preventive system for motor vehicles
US3678909A (en) * 1970-12-21 1972-07-25 Ford Motor Co Exhaust gas recirculation control mechanism

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2787989A (en) * 1956-03-19 1957-04-09 Fred E Mckinley Dual solenoid controlled apparatus for preventing release of contaminants from an internal combustion engine
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
US3605709A (en) * 1969-03-19 1971-09-20 Nissan Motor Vehicular air-pollution preventive system
US3610219A (en) * 1970-05-22 1971-10-05 Gen Motors Corp Exhaust gas recirculation control
US3678909A (en) * 1970-12-21 1972-07-25 Ford Motor Co Exhaust gas recirculation control mechanism

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4075994A (en) * 1972-06-02 1978-02-28 Texaco Inc. Internal combustion engine operation utilizing exhaust gas recirculation
US4020809A (en) * 1975-06-02 1977-05-03 Caterpillar Tractor Co. Exhaust gas recirculation system for a diesel engine
US4085718A (en) * 1976-02-06 1978-04-25 Daimler-Benz Aktiengesellschaft Exhaust gas return system for auto-igniting internal combustion engines
US4157081A (en) * 1977-01-18 1979-06-05 Nissan Diesel Motor Co., Ltd. Recirculated exhaust gas control device for use in a diesel engine
US4181109A (en) * 1977-05-16 1980-01-01 Nissan Diesel Kogyo Company, Ltd. Exhaust gas recirculation apparatus
US4196708A (en) * 1977-12-01 1980-04-08 Lucas Industries Limited Engine systems
US4231337A (en) * 1978-04-28 1980-11-04 Hitachi, Ltd. Air intake system for diesel engine
US4192267A (en) * 1978-09-22 1980-03-11 Texaco Inc. Exhaust gas recycling in an internal combustion engine
US4206730A (en) * 1978-09-22 1980-06-10 Texaco Inc. Method for recycling exhaust gas from an internal combustion engine
US4295455A (en) * 1978-10-09 1981-10-20 Nissan Motor Co. Ltd Exhaust gas recirculation control system for a compression-ignition internal combustion engine
DE2939805A1 (de) * 1978-10-09 1980-04-24 Nissan Motor Steuersystem fuer die abgasrueckfuehrung bei dieselmotoren
US4269159A (en) * 1978-10-12 1981-05-26 Lucas Industries Limited Engine system
US4286566A (en) * 1979-06-08 1981-09-01 Lucas Industries Limited Engine system
US4313415A (en) * 1979-06-14 1982-02-02 Nissan Motor Co., Ltd. Exhaust gas recirculation system in compression-ignition internal combustion engine
US4369753A (en) * 1980-07-25 1983-01-25 Toyota Jidosha Kogyo Kabushiki Kaisha Pressure mediated diesel engine exhaust gas recirculation control system
US4349004A (en) * 1980-10-22 1982-09-14 Nissan Diesel Kogyo Kabushiki Kaisha Exhaust gas recirculation apparatus for diesel engine
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
EP0484656A3 (en) * 1990-11-06 1992-07-29 Firma Carl Freudenberg Device for metering exhaust gases into the combustion chamber of an internal combustion engine
US5531205A (en) * 1995-03-31 1996-07-02 Siemens Electric Limited Rotary diesel electric EGR valve
AT411545B (de) * 2001-05-14 2004-02-25 Man Steyr Ag Brennkraftmaschine in einem fahrzeug mit einer motorbremsvorrichtung und einer abgasrückführeinrichtung

Also Published As

Publication number Publication date
JPS5429652B2 (enrdf_load_stackoverflow) 1979-09-25
JPS4944129A (enrdf_load_stackoverflow) 1974-04-25

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