US3768452A - Engine exhaust gas recirculating control - Google Patents

Engine exhaust gas recirculating control Download PDF

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Publication number
US3768452A
US3768452A US00241044A US3768452DA US3768452A US 3768452 A US3768452 A US 3768452A US 00241044 A US00241044 A US 00241044A US 3768452D A US3768452D A US 3768452DA US 3768452 A US3768452 A US 3768452A
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United States
Prior art keywords
vacuum
valve
manifold vacuum
manifold
signal
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Expired - Lifetime
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US00241044A
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English (en)
Inventor
J Lewis
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Ford Motor Co
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Ford Motor Co
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Publication date
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Publication of US3768452A publication Critical patent/US3768452A/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
    • F02M26/55—Systems for actuating EGR valves using vacuum actuators
    • F02M26/56—Systems for actuating EGR valves using vacuum actuators having pressure modulation valves

Definitions

  • ABSTRACT The engine has a duct connecting the exhaust gas crossover passage to the intake manifold, the duct normally being closed by a valve that is opened by manifold vacuum connected thereto past an air-bleed device that normally is closed and opened against a spring force by manifold vacuum above a predetermined level so that the gas recirculating valve opening signal force varies directly with manifold vacuum below the predetermined level and inversely above the level to prevent recirculation during engine idle and cruising and wide-open throttle operations while providing controlled operation in the range between.
  • This invention relates, in general, to an internal combustion engine. More particularly, it relates to a system for controlling the recirculation of exhaust gases back into the engine through the intake manifold.
  • Devices for recirculating a portion of the engine exhaust gases back through the engine to control the emission of unburned hydrocarbons and lower the output of oxides of nitrogen. These devices have included valving to prevent recirculation of the exhaust gases at undesired times and generally are controlled by movement of the carburetor throttle valve so that recirculation is prevented during engine idle and wideopen throttle operations. This is desirable because at engine idle, exhaust gas scavenging is inefficient, while at wide-open throttle position, maximum power is limited by the availability of oxygen.
  • Another object of the invention is to provide selective control of exhaust gas recirculating flow of an engine in responses to changes in intake manifold vacuum level, in contrast to control by changes in carburetor spark port vacuum level.
  • FIG. 1 is a cross-sectional view of a portion of an internal combustion engine and associated carburetor embodying the invention.
  • FIG. 2 is a cross-sectional view taken on a plane indicated by and viewed in the direction of the arrows 22 of FIG. 1.
  • FIG. 1 illustrates a portion of one-half of a four barrel carburetor of a known downdraft type. It has an air horn section 12, a main body portion 14, and a throttle body 16, joined by suitable means not shown.
  • the carburetor has the usual air/fuel induction passages 18 open at their upper ends 20 to fresh air from the conventional air cleaner, not shown.
  • the passages 18 have the usual fixed area venturies 22 cooperating with booster venturies 24 through which the main supply of fuel is induced, by means not shown.
  • Flow of air and fuel through induction passages 18 is controlled by a pair of throttle valve plates 26 each fixed on a shaft 28 rotatably mounted in the side walls of the carburetor body.
  • the throttle body 16 is flanged as indicated for bolting to the top of the engine intake manifold 30, with a spacer element 32 located between.
  • Manifold 30 has a number of vertical risers or bores 34 that are aligned for cooperation with the discharge end of the carburetor induction passages 18.
  • the risers 34 extend at right angles at their lower ends 36 for passage of the mixture out of the plane of the figure to the intake valves of the engine.
  • the exhaust manifolding part of the engine cylinder head is indicated partially at 38, and includes an exhaust gas crossover passage 40.
  • the latter passes from the exhaust manifold, not shown, on one side of the engine to the opposite side beneath the manifold trunks 36 to provide the usual hot spot beneath the carburetor to better vaporize the air/fuel mixture.
  • the spacer 32 is provided with a worm-like recess 42 that is connected directly to crossover passage 40 by a bore 44. Also connected to passage 42 is a passage 46 alternately blocked or connected to a central bore or passage 48 communicating with the risers 34 through a pair of ports 50. Mounted to one side of the spacer is a cup shaped boss 52 forming a chamber 54 through which passages 46 and 48 are interconnected.
  • passage 46 normally is closed by a valve 56 that is moved to an open-position by a servo 58.
  • the servo includes a hollow outer shell 64 containing an annular flexible diaphragm 66. The latter divides the interior into an air chamber 68 and a signal vacuum chamber 70. Chamber 68 is connected to atmospheric pressure through a vent 72, while chamber 70 is connected to a vacuum signal force through a line 74.
  • the stem of valve 56 is fixed to a pair of retainers 76 that are secured to diaphragm 66 and serve as a seat for a compression spring 77 normally biasing the valve to its closed position.
  • The'stem slidably and sealingly projects through a plate 78 closing chamber 54.
  • the carburetor contains a manifold vacuum sensing port 80 connected by a line 82 and an air-bleed device 84 to the vacuum signal line 74 shown in FIG. 2.
  • Device 84 in this case consists of a can 86 having an opening 88 communicating with the atmosphere through a filter 90 located in a retainer 92.
  • the can is divided into a pair of chambers 94 and 96 by an annular flexible diaphragm 98.
  • the diaphragm has secured to it a needle type valve 100 constituting an air-bleed control, the valve being normally moved to close opening 88 by a spring 102.
  • a line 82a connects one side of chamber 96 to the manifold vacuum line 82 through an orifice 104, the opposite side being connected by line 74a to the vacuum signal line 74.
  • a branch line 106 connects manifold vacuum to chamber 94.
  • spring 102 is chosen such that below a vacuum force of say 7 inches hg., for example, spring 102 will maintain the bleed valve 100 in a position closing the vent or opening 88.
  • Spring 77 normally would be a light spring, although it will be clear its force can be varied to vary operation of servo 58.
  • the invention accomplishes this by providing a vacuum signal force to servo 58 to open valve 56 that varies directly in proportion to the increase in manifold vacuum, below a predetermined vacuum level of seven inches hg., while above seven inches hg., varying in inverse proportion to increases in manifold vacuum.
  • the manifold vacuum level in port 80 will be high and above seven inches hg. Accordingly, manifold vacuum acting in chamber 94 will pull the diaphragm 98 and bleed valve lltltl to a position opening vent 88 and allowing air to be bled into chamber 96 so that nearly an atmospheric pressure level will exist. Accordingly, line 74 and chamber 70 of servo 5% will be essentially at atmospheric pressure level allowing spring 77 to maintain valve 56 closing line 46.
  • the throttle valves When the vehicle has reached its cruising condition, the throttle valves will be operating at slightly off idle position or slightly opened from the positions shown.
  • the manifold vacuum will be essentially at a maximum value and cause a complete opening of air bleed valve 100. This will provide essentially atmospheric pressure in the servo chamber 70 and maintain valve 56 closing passage 46.
  • a rapid opening of the throttle valves to their wide-open position indicating demand for maximum torque will drop the manifold vacuum level essentially to zero permitting complete closure of the air-bleed valve 100.
  • the servo 58 since the manifold vacuum at this time is essentially zero, the servo 58 will maintain valve 56 closed and no recirculation of exhaust gases will occur until the vacuum level again builds up.
  • the invention provides a selective control of exhaust gas recirculation through the use of a pilot valve controlled by manifold vacuum changes. While the invention has been described and illustrated in its preferred embodiment, it will be clear to those skilled in the arts to which it pertains that many changes and modifications may be made thereto without departing from the scope of the invention.
  • An exhaust gas recirculating system for an internal combustion engine comprising, a duct connecting the exhaust gases to the engine intake manifold, a valve normally closing the duct to prevent recirculation and movable by a signal vacuum connected thereto to an open position, and means operable to provide a signal vacuum to the valve that varies in direct proportion to manifold vacuum changes below a predetermined manifold vacuum level while above the predetermined level varies the signal vacuum in inverse proportion to manifold vacuum changes.
  • a system as in claim 1 including means connecting manifold vacuum to the means operable to provide a signal vacuum to operate the means operable.
  • the means operable including a line connecting manifold vacuum to a signal vacuum passage connected to the valve, and an air bleed valve movable by manifold vacuum above a predetermined manifold vacuum level to variably bleed air into the line as a function of manifold vacuum increases.
  • the means operable including a line connecting manifold vacuum to a signal vacuum passage connected to the valve, and an air bleed device in the line to control the signal vacuum in the manner indicated in claim l, the air bleed device including an air bleed opening in the line, a valve movable by intake manifold vacuum out of the air bleed opening, and spring means biasing the air bleed valve closed below a predetermined intake manifold vacuum level.
  • An exhaust gas recirculating system for an internal combustion engine having intake and exhaust manifolding and a carburetor with an induction passage connected to the intake manifold and having a throttle valve movable across the passage to open and close the passage to control the flow therethrough, a duct connecting the intake and exhaust manifolding for recirculating the exhaust gases back into the engine, a second valve movable between alternate positions to open and close the duct, a servo connected to the second valve and having spring means biasing the second valve to one position, a vacuum signal line connected to the second valve for moving the same to the other position, a second passage connecting manifold vacuum to the signal line, and air bleed means in the second passage controlling the vacuum signal force in the signal line, the air bleed means including a vent in the second passage, an air bleed control valve movable into and out of the vent to close or open the same to control the level of transfer of manifold vacuum to the signal line, spring means biasing the air bleed valve closed, and manifold vacuum operated servo means
  • the air bleed valve having a tapered surface cooperating with the vent to progressively vary the bleed of air to the signal line with changes in manifold 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)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
US00241044A 1972-04-04 1972-04-04 Engine exhaust gas recirculating control Expired - Lifetime US3768452A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US24104472A 1972-04-04 1972-04-04

Publications (1)

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US3768452A true US3768452A (en) 1973-10-30

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US00241044A Expired - Lifetime US3768452A (en) 1972-04-04 1972-04-04 Engine exhaust gas recirculating control

Country Status (6)

Country Link
US (1) US3768452A (ja)
JP (1) JPS5143541B2 (ja)
AU (1) AU452492B2 (ja)
CA (1) CA969048A (ja)
DE (1) DE2311407A1 (ja)
GB (1) GB1433778A (ja)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3901202A (en) * 1973-05-25 1975-08-26 Gen Motors Corp Vacuum bias regulator assembly
US3930475A (en) * 1973-08-24 1976-01-06 Ford Motor Company Engine exhaust gas recirculating control
US3955364A (en) * 1974-01-04 1976-05-11 Ford Motor Company Engine deceleration vacuum differential valve control
US3977381A (en) * 1973-08-31 1976-08-31 Nissan Motor Co., Ltd. Exhaust gas recirculation system
US3981283A (en) * 1974-09-03 1976-09-21 Ford Motor Company Engine exhaust gas recirculating control
US4033125A (en) * 1974-11-26 1977-07-05 Aisin Seiki Kabushiki Kaisha Air flow control means for automobile engine exhaust gas cleaning means
US4033306A (en) * 1974-06-11 1977-07-05 Nissan Motor Co., Ltd. Exhaust gas recirculation system
US4041915A (en) * 1975-01-14 1977-08-16 Nissan Motor Company Limited Apparatus to control the recirculation of exhaust gases into the intake passage in an internal combustion engine
US4106452A (en) * 1976-03-11 1978-08-15 Toyota Jidosha Kogyo Kabushiki Kaisha Exhaust gas recirculator
US4111172A (en) * 1974-11-30 1978-09-05 Nissan Motor Company, Limited System to feed exhaust gas into the induction passage of an internal combustion engine
US4114576A (en) * 1976-06-09 1978-09-19 Toyota Jidosha Kogyo Kabushiki Kaisha Exhaust gas recirculating control system
US4125099A (en) * 1976-07-07 1978-11-14 Hitachi, Ltd. Carburetor with fuel compensation device
US4186702A (en) * 1978-06-02 1980-02-05 General Motors Corporation Exhaust gas recirculation control

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5212856B2 (ja) * 1973-04-19 1977-04-09
US3885537A (en) * 1973-11-05 1975-05-27 Ford Motor Co Road load modulated exhaust gas recirculation system
GB2245650A (en) * 1990-07-04 1992-01-08 Ford Motor Co Diesel engine exhaust gas recirculation control

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1098825A (en) * 1964-03-18 1968-01-10 Petrol Injection Ltd Valve control device
US3643640A (en) * 1970-02-12 1972-02-22 Exxon Research Engineering Co Low-polluting internal combustion engine wherein exhaust gases are recycled in a controlled pattern
US3641989A (en) * 1970-11-16 1972-02-15 Gen Motors Corp Exhaust gas recirculation

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3901202A (en) * 1973-05-25 1975-08-26 Gen Motors Corp Vacuum bias regulator assembly
US3930475A (en) * 1973-08-24 1976-01-06 Ford Motor Company Engine exhaust gas recirculating control
US3977381A (en) * 1973-08-31 1976-08-31 Nissan Motor Co., Ltd. Exhaust gas recirculation system
US3955364A (en) * 1974-01-04 1976-05-11 Ford Motor Company Engine deceleration vacuum differential valve control
US4033306A (en) * 1974-06-11 1977-07-05 Nissan Motor Co., Ltd. Exhaust gas recirculation system
US3981283A (en) * 1974-09-03 1976-09-21 Ford Motor Company Engine exhaust gas recirculating control
US4033125A (en) * 1974-11-26 1977-07-05 Aisin Seiki Kabushiki Kaisha Air flow control means for automobile engine exhaust gas cleaning means
US4111172A (en) * 1974-11-30 1978-09-05 Nissan Motor Company, Limited System to feed exhaust gas into the induction passage of an internal combustion engine
US4041915A (en) * 1975-01-14 1977-08-16 Nissan Motor Company Limited Apparatus to control the recirculation of exhaust gases into the intake passage in an internal combustion engine
US4106452A (en) * 1976-03-11 1978-08-15 Toyota Jidosha Kogyo Kabushiki Kaisha Exhaust gas recirculator
US4114576A (en) * 1976-06-09 1978-09-19 Toyota Jidosha Kogyo Kabushiki Kaisha Exhaust gas recirculating control system
US4125099A (en) * 1976-07-07 1978-11-14 Hitachi, Ltd. Carburetor with fuel compensation device
US4186702A (en) * 1978-06-02 1980-02-05 General Motors Corporation Exhaust gas recirculation control

Also Published As

Publication number Publication date
DE2311407A1 (de) 1973-10-11
JPS5143541B2 (ja) 1976-11-22
CA969048A (en) 1975-06-10
AU5093473A (en) 1974-07-11
JPS4913521A (ja) 1974-02-06
AU452492B2 (en) 1974-09-05
GB1433778A (en) 1976-04-28

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