US3818880A - Exhaust gas recirculation control for internal combustion engines - Google Patents

Exhaust gas recirculation control for internal combustion engines Download PDF

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Publication number
US3818880A
US3818880A US00277219A US27721972A US3818880A US 3818880 A US3818880 A US 3818880A US 00277219 A US00277219 A US 00277219A US 27721972 A US27721972 A US 27721972A US 3818880 A US3818880 A US 3818880A
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United States
Prior art keywords
vacuum
control
exhaust gas
engine
venturi
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Expired - Lifetime
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US00277219A
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English (en)
Inventor
G Dawson
R Harris
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Old Carco LLC
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Chrysler Corp
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Application filed by Chrysler Corp filed Critical Chrysler Corp
Priority to US00277219A priority Critical patent/US3818880A/en
Priority to JP48082774A priority patent/JPS4957228A/ja
Priority to FR7328242A priority patent/FR2194884B1/fr
Priority to GB3662373A priority patent/GB1413023A/en
Priority to DE19732338906 priority patent/DE2338906A1/de
Application granted granted Critical
Publication of US3818880A publication Critical patent/US3818880A/en
Priority to JP1977128960U priority patent/JPS5348914U/ja
Assigned to FIDELITY UNION TRUST COMPANY, TRUSTEE reassignment FIDELITY UNION TRUST COMPANY, TRUSTEE MORTGAGE (SEE DOCUMENT FOR DETAILS). Assignors: CHRYSLER CORPORATION
Assigned to CHRYSLER CORPORATION reassignment CHRYSLER CORPORATION ASSIGNORS HEREBY REASSIGN, TRANSFER AND RELINQUISH THEIR ENTIRE INTEREST UNDER SAID INVENTIONS AND RELEASE THEIR SECURITY INTEREST. (SEE DOCUMENT FOR DETAILS). Assignors: ARNEBECK, WILLIAM, INDIVIDUAL TRUSTEE, FIDELITY UNION BANK
Assigned to CHRYSLER CORPORATION reassignment CHRYSLER CORPORATION PARTES REASSIGN, TRANSFER AND RELINQUISH THEIR ENTIRE INTEREST UNDER SAID PATENTS ALSO RELEASE THEIR SECURITY INTEREST. (SEE RECORD FOR DETAIL) Assignors: MANUFACTURERS NATIONAL BANK OF DETROIL (CORPORATE TRUSTEE) AND BLACK DONALD E., (INDIVIDUAL TRUSTEE)
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
    • F02M26/56—Systems for actuating EGR valves using vacuum actuators having pressure modulation valves

Definitions

  • This invention is concerned with systems and apparatus for controlling exhaust gas recirculation (EGR), particularly as applied to motor vehicles driven by internal combustion engines.
  • EGR exhaust gas recirculation
  • the recirculation of portions of internal combustion engine exhaust back to the engine combustion chambers is coming into general use for suppressing to some extent the formation of NO, in the engine exhaust, the idea being to introduce inert substances, i.e., combusted exhaust gas into the combustion chamber in order to lower peak combustion temperatures therein, thereby reducing NO formation.
  • An EGR valve is used to control recirculation of the exhaust gas.
  • the valve is typically a vacuum operated valve.
  • Amplifier systems are distinguished from ported systems in that the former utilize a vacuum amplifier controlled by venturi vacuum for providing controlled modulated vacuum to an EGR valve.
  • the vacuum to the EGR valve is modulated by the throttle bladeat a port in the engine carburetor bore.
  • Amplifier EGR systems have heretofore tended to have limited capability for controlling NO emissions. Specifically, manifold vacuum tends to vary widely depending on engine operation thus effecting the control of the EGR valve.
  • FIG. 1 represents a schematic diagram of an apparatus and system incorporating the vacuum relief feature of the invention
  • FIG. 2. is across section ofan EGR vacuum amplifier designed to integrate the functions of vacuum reservoir, dump valve and amplifier in one unit thus greatly simplifying the plumbing required with the use of this invention.
  • FIG. 1 shows an improved EGR control system andapparatus for motor vehicles driven by internal combustion engines inwhich according to this invention exhaust gas is recirculated to the engine combustion chambers to lower exhaust gas emissions of NO, while vehicle driveability is substantially maintained.
  • the Figure includes an EGR valve 10, of any one of the types well-known in the art, capable of controllably. recirculating exhaust gases, and carburetor 12 having a throttle valve 14 of the butterfly type.
  • Carburetor venturi vacuum source means is provided by conduit 16 which tapsinto the venturi section 18 of carburetor l2 and thus senses the venturi vacuum.
  • Engine manifold vacuum source means is provided by conduit 20 which taps into the carburetor below throttle valve 14 and thus senses engine manifold vacuum.
  • Vacuumv reservoir means is provided by a vacuum contained 22 which is connected to conduit 20. via a check valve 24 such that container 22 is evacuated by the engine manifold vacuum. This vacuum is stored and maintained by container 22 and providedias an input vacuum via conduit 26, whichis connected at one end to container 22.
  • a vacuum amplifier is interconnected between carburetor 12 and vacuum reservoir container 22 by connection with venturi vacuum control conduit 16 and vacuum input conduit 26.
  • the function of amplifier 28 is to provide a control output vacuum in conduit 30 for controlling the operation of able and substantially proportional to the relatively wealt venturi control signal vacuum.
  • vacuum motor 32 includes a diaphragm 36 and operating means 38 which interconnects between diaphragm 36 and a diaphragm 40 of the vacuum regulator for operating diaphragm 40.
  • the venturi vacuum control signal operative in conduit 16 and the upper chamber 42 of amplifier 28, controls the portion of diaphragm 36 depending on the vacuum level of the venturi control vacuum and hence the position of diaphragm 40.
  • Diaphragm 40 is designed to close off conduit 26 as shown and to lift from or open conduit 26 when the venturi vacuum control signal increases thereby increasing the output vacuum in contouri control vacuum decreases thereby closing EGR valve 10 as well.
  • amplifier 28 is to receive the input vacuum of conduit 26 and to apply it to EGR valve 10 in accordance with the venturi vacuum control signal in conduit 16, thus in effect amplifying the venturi signal.
  • amplifier 28 provides a control means responsive to a vacuum control signal and operable to modulate, in accordance with the vacuum control signal, the operating vacuum provided to the EGR valve by the vacuum reservoir means 22.
  • Vacuum relief means is provided in accordance with this invention and in FIG. 1 takes the form of a vacuum operated diaphragm valve generally indicated at 50.
  • Relief valve 50 includes a diaphragm 52 separating two chambers, a venturi vacuum chamber 54 and a manifold vacuum chamber 56, from each other. Venturi vacuum communicates with chamber 54 via conduit 58 which is a branch of conduit 16. Manifold vacuum is provided via conduit 65 which is branch of conduit 20. As shown'schematically diaphragm 52 seats on the end of conduit 60 to provide normal closure thereof. Chamber 56 is vented to manifold vacuum in conduit 65 by means of opening 62.
  • venturi vacuum in chamber 54 reaches any given level which can be selected by the design of relief means 50, diaphragm 52 will lift from the end of conduit 60 thus venting container 22 via opening 62 to conduit 65 until it reaches the manifold vacuum level.
  • this valve 50 be designed to vent container 22 to the manifold vacuum level when the venturi vacuum exceeds the manifold vacuum level, for example, when the venturi vacuum is at about 2 inches of mercury (2" Hg) and the manifold vacuum level is at about l.72" of Hg or when venturi vacuum is within about 0.3" of the manifold vacuum level.
  • the venturi vacuum control signal through conduit 16 is amplified by vacuum amplifier 28, preferably in a [:1 ratio from most motor vehicles, to a value which is basically limited by the reservoir source vacuum in container 22.
  • the amplified output vacuum operates the vacuum controlled EGR valve as previously described.
  • Reservoir container 22 also provides a vacuum source to amplifier 28 during accelerations when manifold vacuum is reduced.
  • Check valve 24 is built into reservoir container 22 to trap high vacuum achieved at low speeds or decelerations.
  • This arrangement provides a substantially constant input vacuum in conduit 26 for application through amplifier'28, modulation therein and transformation therefrom as a control vacuum for application to EGR valve 10.
  • the dump valve means 50 vents the reservoir to the manifold vacuum level whenever venturi vacuum approaches or exceeds manifold vacuum, a wide-open throttle characteristic. This feature allows the EGR valve to close at WOT in order to achieve maximum engine power.
  • FIG. 2 shows an integral vacuum amplifier designed to incorporate into one integrated structure the functions of vacuum reservoir 22, amplifier 28 and relief means 50, thus simplifying the overall arrangement, particularly insofar as plumbing is concerned.
  • An amplifier of this type is presently offered by the Ranco Controls Division and is more completely described in their information bulletin No. 005-4-72 entitled EGR Vacuum Amplifier. The specific design of that particular amplifier is no part of the present invention nor is any claim made thereto.
  • FIG. 2 parts similar to those shown in FIG. 1 are correspondingly numbered.
  • the basic amplifier operates on the principal of a balance of force as created by the interaction of the input and output vacuum signals which are provided at 16 and 30, respectively, and the input thereof on the respective diaphragms 36 and 40.
  • the ratio of the effective areas of these two diaphragms is fixed and equal to the designed degree of amplification.
  • the output signal responds as the forces readjust themselves for new levels of equilibrium.
  • Vacuum regulation of the output at 30 is directly controlled by means of a hook-washer 62 and small diaphragm 64.
  • internal port 66 opens communicating output chamber 68 to the higher force vacuum provided by reservoir 22.
  • the vacuum in output chamber 68 rises so does the force acting on diaphragm 40 and opposing the force on the hook washer.
  • the port recloses at the new higher vacuum level in the output chamber.
  • Relief valve 50 consists of a diaphragm separating the venturi signal provided at input conduit 16 from the manifold vacuum signal and reservoir 22.
  • venturi vacuum substantially equals or exceeds manifold vacuum (wide open throttle condition) the differential causes the relief valve diaphragm to lift venting reservoir 22 to input 20 thus dumping the output signal and causing closure of the EGR valve for maximum engine performance.
  • the venturi signal at 16 also communicates at chamber 42 for operating venturi diaphragm 36.
  • thermal cut-off switch located in the fresh air plenum may also be included if desired to open an air bleed at lower ambients, the
  • the air bleed level being interconnected with integral amplifier to the venturi vacuum.
  • the air bleed reduces the venturi vacuum signal at low ambient temperatues, such as are present with a cold engine when first starting, and thus the output of the amplifier is reduced resulting in reduced recycle and improved driveability at low ambient temperatures.
  • vacuum reservoir means for providing an operating control vacuum to the exhaust gas recirculating valve
  • engine manifold vacuum source means operable by way of a check valve means to provide vacuum to the vacuum reservoir means duringengine operation;
  • control means responsive to a vacuum control signal and operable to modulate, in accordance with the vacuum control signal, the operating control vacuum provided to the exhaust gas recirculating valve by the vacuum reservoir means;
  • carburetor venturi vacuum source means operable to provide a carburetor venturi vacuum control signal to the control means during engine operation thereby effecting the operation of the control means and the modulation of the operating vacuum provided to the exhaust gas recirculating valve during engine operation, and
  • vacuum relief means operable to vent the vacuum reservoir means to engine manifold vacuum level whereupon the operating vacuum is no longer provided
  • the relief means including operating means controlled by and responsive to both venturi vacuum and manifold vacuum for opening the vacuum relief means and venting the vacuum reservoir means when the venturi vacuum achieves a predetermined relationship to the manifold vacuum level during which time exhaust gas recirculation is terminated due to closure of the exhaust gas recirculation valve.
  • the vacuum reservoir means includessaid check valve means for trapping vacuum achieved at low speeds and decelerations.
  • the engine manifold vacuum source means comprises a conduit communicating at one end with the vacuum reservoir means and at another end it is adapted for connection to an internal combustion engine at a tap-in point suitable for interfacing with the engine manifold vacuum.
  • control means is connected between the vacuum reservoir means and the exhaust gas recirculation valve.
  • the carburetor venturi vacuum source means comprises a conduit communicating at one end with control means and at another end it is adapted for connection to an internal combustion engine carburetor at a tap-in point for interfacing with the carburetor venturi vacuum.
  • engine power means operable to provide vacuum output meansadapted for connection to an exhaust gas recirculation valve; control means connected to the vacuum output means to control the vacuum thereof in accordance with a vacuum control signal;
  • vacuum reservoir means connected to the control means for providing a vacuum thereto to be controlled by the vacuum control signal
  • vacuum input means adapted for connection to a source of input vacuum and communicating by copy of a check valve means with the vacuum reservoir means;
  • relief means communicating between the vacuum reservoir means and the vacuum input means for venting the former to the latter, the relief means being normally closed by the input vacuum, and
  • vacuum control means adapted for connection to a source of control vacuum and communicating with the control means for modulating the vacuum output provided thereby for the vacuum output means the relief means is also being connected to the source of control vacuum for opening it when the control vacuum achieves a predetermined relationship to the input vacuum, said source of control vacuum providing said vacuum control signal.

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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)
US00277219A 1972-08-02 1972-08-02 Exhaust gas recirculation control for internal combustion engines Expired - Lifetime US3818880A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00277219A US3818880A (en) 1972-08-02 1972-08-02 Exhaust gas recirculation control for internal combustion engines
JP48082774A JPS4957228A (enrdf_load_stackoverflow) 1972-08-02 1973-07-24
GB3662373A GB1413023A (en) 1972-08-02 1973-08-01 Exhaust gas recirculation control for internal combustion engines
DE19732338906 DE2338906A1 (de) 1972-08-02 1973-08-01 Vorrichtung zur steuerung der abgasrezirkulation bei motorfahrzeugen mit brennkraftmaschinen
FR7328242A FR2194884B1 (enrdf_load_stackoverflow) 1972-08-02 1973-08-01
JP1977128960U JPS5348914U (enrdf_load_stackoverflow) 1972-08-02 1977-09-27

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00277219A US3818880A (en) 1972-08-02 1972-08-02 Exhaust gas recirculation control for internal combustion engines

Publications (1)

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US3818880A true US3818880A (en) 1974-06-25

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US00277219A Expired - Lifetime US3818880A (en) 1972-08-02 1972-08-02 Exhaust gas recirculation control for internal combustion engines

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US (1) US3818880A (enrdf_load_stackoverflow)
JP (2) JPS4957228A (enrdf_load_stackoverflow)
DE (1) DE2338906A1 (enrdf_load_stackoverflow)
FR (1) FR2194884B1 (enrdf_load_stackoverflow)
GB (1) GB1413023A (enrdf_load_stackoverflow)

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885536A (en) * 1973-10-23 1975-05-27 Ford Motor Co Recirculating exhaust gas load initiated control (relic)
US3888222A (en) * 1973-10-02 1975-06-10 Toyota Motor Co Ltd Exhaust gas recirculation
US3919843A (en) * 1972-12-12 1975-11-18 Renault Multifunction control valve
USB405899I5 (enrdf_load_stackoverflow) * 1973-10-12 1976-03-23
JPS5159707U (enrdf_load_stackoverflow) * 1974-11-07 1976-05-11
US3962868A (en) * 1974-05-24 1976-06-15 Toyota Jidosha Kogyo Kabushiki Kaisha Exhaust gas purifying system for use in internal combustion engine
US3970061A (en) * 1974-03-04 1976-07-20 Ranco Incorporated Control system for exhaust gas recirculating valve
US3974651A (en) * 1973-05-19 1976-08-17 Nissan Motor Co., Ltd. Afterburning control of internal combustion engine exhaust gas
US3996905A (en) * 1974-11-25 1976-12-14 Chrysler Corporation Vacuum controls for internal combustion engines
US3998194A (en) * 1975-09-04 1976-12-21 Acf Industries, Incorporated System for control of exhaust gas recirculation
US4033308A (en) * 1974-06-24 1977-07-05 Nissan Motor Co., Ltd. Exhaust gas recirculation control system
US4033309A (en) * 1974-06-24 1977-07-05 Nissan Motor Co., Ltd. Exhaust gas recirculation system with control apparatus for exhaust gas flow control valve
US4041914A (en) * 1974-06-25 1977-08-16 Nissan Motor Company, Limited Exhaust gas recirculation system with control apparatus for exhaust gas flow control valve
US4047510A (en) * 1974-06-27 1977-09-13 Nissan Motor Company, Limited Exhaust gas recirculation system with control apparatus for exhaust gas flow control valve
US4106464A (en) * 1976-08-24 1978-08-15 Yamaha Hatsudoki Kabushiki Kaisha Programmed control system for a lean-burning internal combustion engine
US4137880A (en) * 1977-11-03 1979-02-06 Chrysler Corporation Time delay apparatus for an exhaust gas recirculation controller
US4186702A (en) * 1978-06-02 1980-02-05 General Motors Corporation Exhaust gas recirculation control
US4218880A (en) * 1975-12-01 1980-08-26 Nissan Motor Company, Limited Spark-ignition internal combustion engine
US4235207A (en) * 1978-03-06 1980-11-25 Honda Giken Kogyo Kabushiki Kaisha Internal combustion engine
US4235208A (en) * 1978-06-16 1980-11-25 Honda Giken Kogyo Kabushiki Kaisha Exhaust gas recirculation regulating system
US4242998A (en) * 1978-09-06 1981-01-06 Honda Giken Kogyo Kabushiki Kaisha Engine exhaust gas recirculation system
US4249490A (en) * 1978-09-01 1981-02-10 Honda Giken Kogyo Kabushiki Kaisha Exhaust gas recirculation for engine
US4249504A (en) * 1978-09-14 1981-02-10 Honda Giken Kogyo Kabushiki Kaisha Unitary assembly for control of EGR apparatus for engine
US4249505A (en) * 1978-06-12 1981-02-10 Honda Giken Kogyo Kabushiki Kaisha Compensation system for quantity of intake air for an internal combustion engine
US4249503A (en) * 1978-09-07 1981-02-10 Honda Giken Kogyo Kabushiki Kaisha Exhaust gas recirculation for engine
US4274384A (en) * 1978-09-12 1981-06-23 Honda Giken Kogyo Kabushiki Kaisha Engine exhaust gas recirculation system
US4308835A (en) * 1980-01-25 1982-01-05 Abbey Harold Closed-loop fluidic control system for internal combustion engines
US4386597A (en) * 1979-11-15 1983-06-07 Honda Giken Kogyo Kabushiki Kaisha Exhaust gas recirculation control device for an internal combustion engine and associated method
EP0107309A1 (en) * 1982-09-27 1984-05-02 Borg-Warner Corporation Pressure control system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU6377773A (en) * 1973-01-02 1975-06-19 Ranco Inc Exhaust gas recirculating valve
JPS514415A (enrdf_load_stackoverflow) * 1974-06-27 1976-01-14 Nissan Motor
FR2601722B1 (fr) * 1986-07-18 1988-10-07 Renault Dispositif de recirculation de gaz d'echappement auto-adaptatif en fonction de l'altitude

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3739797A (en) * 1971-08-03 1973-06-19 Ranco Inc Control apparatus for exhaust gas recirculating system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3739797A (en) * 1971-08-03 1973-06-19 Ranco Inc Control apparatus for exhaust gas recirculating system

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3919843A (en) * 1972-12-12 1975-11-18 Renault Multifunction control valve
US3974651A (en) * 1973-05-19 1976-08-17 Nissan Motor Co., Ltd. Afterburning control of internal combustion engine exhaust gas
US3888222A (en) * 1973-10-02 1975-06-10 Toyota Motor Co Ltd Exhaust gas recirculation
US4079710A (en) * 1973-10-12 1978-03-21 Hitachi, Ltd. Exhaust gas recirculation device
USB405899I5 (enrdf_load_stackoverflow) * 1973-10-12 1976-03-23
US3885536A (en) * 1973-10-23 1975-05-27 Ford Motor Co Recirculating exhaust gas load initiated control (relic)
US3970061A (en) * 1974-03-04 1976-07-20 Ranco Incorporated Control system for exhaust gas recirculating valve
US3962868A (en) * 1974-05-24 1976-06-15 Toyota Jidosha Kogyo Kabushiki Kaisha Exhaust gas purifying system for use in internal combustion engine
US4033308A (en) * 1974-06-24 1977-07-05 Nissan Motor Co., Ltd. Exhaust gas recirculation control system
US4033309A (en) * 1974-06-24 1977-07-05 Nissan Motor Co., Ltd. Exhaust gas recirculation system with control apparatus for exhaust gas flow control valve
US4041914A (en) * 1974-06-25 1977-08-16 Nissan Motor Company, Limited Exhaust gas recirculation system with control apparatus for exhaust gas flow control valve
US4047510A (en) * 1974-06-27 1977-09-13 Nissan Motor Company, Limited Exhaust gas recirculation system with control apparatus for exhaust gas flow control valve
JPS5159707U (enrdf_load_stackoverflow) * 1974-11-07 1976-05-11
US3996905A (en) * 1974-11-25 1976-12-14 Chrysler Corporation Vacuum controls for internal combustion engines
US3998194A (en) * 1975-09-04 1976-12-21 Acf Industries, Incorporated System for control of exhaust gas recirculation
US4218880A (en) * 1975-12-01 1980-08-26 Nissan Motor Company, Limited Spark-ignition internal combustion engine
US4106464A (en) * 1976-08-24 1978-08-15 Yamaha Hatsudoki Kabushiki Kaisha Programmed control system for a lean-burning internal combustion engine
US4137880A (en) * 1977-11-03 1979-02-06 Chrysler Corporation Time delay apparatus for an exhaust gas recirculation controller
US4235207A (en) * 1978-03-06 1980-11-25 Honda Giken Kogyo Kabushiki Kaisha Internal combustion engine
US4186702A (en) * 1978-06-02 1980-02-05 General Motors Corporation Exhaust gas recirculation control
US4249505A (en) * 1978-06-12 1981-02-10 Honda Giken Kogyo Kabushiki Kaisha Compensation system for quantity of intake air for an internal combustion engine
US4235208A (en) * 1978-06-16 1980-11-25 Honda Giken Kogyo Kabushiki Kaisha Exhaust gas recirculation regulating system
US4249490A (en) * 1978-09-01 1981-02-10 Honda Giken Kogyo Kabushiki Kaisha Exhaust gas recirculation for engine
US4242998A (en) * 1978-09-06 1981-01-06 Honda Giken Kogyo Kabushiki Kaisha Engine exhaust gas recirculation system
US4249503A (en) * 1978-09-07 1981-02-10 Honda Giken Kogyo Kabushiki Kaisha Exhaust gas recirculation for engine
US4274384A (en) * 1978-09-12 1981-06-23 Honda Giken Kogyo Kabushiki Kaisha Engine exhaust gas recirculation system
US4249504A (en) * 1978-09-14 1981-02-10 Honda Giken Kogyo Kabushiki Kaisha Unitary assembly for control of EGR apparatus for engine
US4386597A (en) * 1979-11-15 1983-06-07 Honda Giken Kogyo Kabushiki Kaisha Exhaust gas recirculation control device for an internal combustion engine and associated method
US4308835A (en) * 1980-01-25 1982-01-05 Abbey Harold Closed-loop fluidic control system for internal combustion engines
EP0107309A1 (en) * 1982-09-27 1984-05-02 Borg-Warner Corporation Pressure control system

Also Published As

Publication number Publication date
FR2194884B1 (enrdf_load_stackoverflow) 1976-06-18
GB1413023A (en) 1975-11-05
FR2194884A1 (enrdf_load_stackoverflow) 1974-03-01
DE2338906A1 (de) 1974-02-14
JPS5348914U (enrdf_load_stackoverflow) 1978-04-25
JPS4957228A (enrdf_load_stackoverflow) 1974-06-04

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Effective date: 19840905