EP0106760B1 - Dispositif de commande de recirculation des gaz d'échappement pour moteurs à combustion interne - Google Patents

Dispositif de commande de recirculation des gaz d'échappement pour moteurs à combustion interne Download PDF

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Publication number
EP0106760B1
EP0106760B1 EP83401978A EP83401978A EP0106760B1 EP 0106760 B1 EP0106760 B1 EP 0106760B1 EP 83401978 A EP83401978 A EP 83401978A EP 83401978 A EP83401978 A EP 83401978A EP 0106760 B1 EP0106760 B1 EP 0106760B1
Authority
EP
European Patent Office
Prior art keywords
valve
amplifier
depression
nozzle
exhaust gas
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
Application number
EP83401978A
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German (de)
English (en)
French (fr)
Other versions
EP0106760A1 (fr
Inventor
Henri Arnaud
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.)
Renault SA
Original Assignee
Regie Nationale des Usines Renault
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Filing date
Publication date
Application filed by Regie Nationale des Usines Renault filed Critical Regie Nationale des Usines Renault
Publication of EP0106760A1 publication Critical patent/EP0106760A1/fr
Application granted granted Critical
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Expired 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
    • F02M26/57—Systems for actuating EGR valves using vacuum actuators having pressure modulation valves using electronic means, e.g. electromagnetic valves

Definitions

  • the present invention relates to an exhaust gas recirculation control device for an internal combustion engine.
  • a recirculation passage reintroduces the exhaust gases into the intake manifold of the engine air-fuel mixture in order to reduce the polluting emissions of nitrogen oxides.
  • a recirculation control valve is generally provided in the recirculation passage to control the recirculation flow in response to the vacuum generated by the engine in the intake passage.
  • Document US-A 4325 348 describes an exhaust gas recirculation control device which comprises two control valves connected to a control valve.
  • the first control valve is arranged in the recirculation passage and the second in a conduit connecting the intake passage to the atmosphere.
  • a solenoid valve can act on the second control valve to cancel the recirculation.
  • Document US Pat. No. 4,106,464 describes a device for controlling an engine consuming a lean mixture, which comprises a pneumatic amplifier for controlling the recirculation of the exhaust gases, starting from the vacuum prevailing at an orifice located at idle speed, upstream of the upper wing of a gas butterfly.
  • the object of the invention is to very simply and effectively regulate the rate of recirculation of exhaust gases as a function of the air flow rate and the engine load.
  • an exhaust gas recirculation control device for an internal combustion engine of the type in which an air-fuel mixture intake duct and an exhaust duct communicate with each other by a circuit of recirculation comprising a main valve and connecting pipes, this valve being controlled by the vacuum prevailing in the intake pipe by means of a solenoid valve, as well as a general regulation device a vacuum signal for controlling the this valve, this regulating device is constituted by a pneumatic amplifier of the additive type which comprises two upper and lower chambers, separated by a membrane carrying a valve urged to close by a spring housed in this upper chamber, this lower chamber being connected directly to a venturi neck nozzle.
  • the result of the control vacuum of the single valve is applied to the upper face of the diaphragm of this pneumatic amplifier, generated from the vacuum prevailing at an orifice located, at idle, upstream of the high wing of a throttle valve, through a calibration, and diluted by the depression prevailing at this nozzle, through this valve and another calibration.
  • This feature characterizes a very simple recirculation control device associated with high efficiency, which is based on an additive amplification of a vacuum signal representative of the air flow admitted to the engine.
  • an internal combustion engine 1 comprises an intake duct 2 of an air-fuel mixture and an exhaust duct 3.
  • the main valve 4 comprises a control valve 7 actuated by a pneumatic cylinder 8 with membrane 8a against the action of a spring 9.
  • This jack 8 has a lower chamber 10 sealed from the atmosphere and connected to an orifice 11 of the intake duct 2 located downstream of the lower wing of a gas butterfly 12 when the latter is in the idle position.
  • the exhaust gas recirculation control device essentially comprises a regulation device 13 associated with a solenoid valve 14 controlled by a contactor 15.
  • This regulation device 13 consists of a pneumatic amplifier of additive type 17 comprising two upper 17a and lower 17b chambers, separated by a membrane 17c which carries a valve 18 urged to close by a spring 19.
  • the spring 19 is housed in the upper chamber 17a of the amplifier 17 and the lower chamber 17b of the latter is connected directly to the nozzle 16 at the venturi neck V of the intake duct 2.
  • the result of the control depression the main recirculation valve 4 which is applied to the upper face of the membrane 17c of the pneumatic amplifier 17 is generated from the vacuum prevailing at an orifice 20 located at idle, upstream of the upper wing of the gas butterfly 12, through calibration 21; this result is diluted by the vacuum prevailing at the nozzle 16 through the valve 18 and a calibration 22.
  • An additional device consisting of calibrations 23, 24, a solenoid valve 25 and a contactor 26 can be connected to the upper chamber 17a of the pneumatic amplifier 17 to modify the balance of the membrane 17c of the latter.
  • the variant represented in FIG. 2 differs from the embodiment previously described according to FIG. 1 by the device for correcting the regulation, which however remains based on the same principle; the solenoid valve 25 and the contactor 26 of FIG. 1 are replaced by a pressure valve 29 comprising a valve 30 actuated in the direction of opening by the vacuum prevailing at the nozzle 16 against the action of the spring 31.
  • FIG. 3 differs from the embodiment described above according to Figure 2 by the control vacuum correction device which exerts its action at the recirculation valve by reducing the control signal in the area low loads, while the device corresponding to FIG. 3 acted by increasing the control signal in the area of high loads; to do this, the pressure valve 29 and the calibrations 23, 24 of FIG. 2 are replaced by a pressure valve 32, comprising a valve 33 actuated in the direction of opening by the vacuum prevailing in the intake manifold, against the action of a spring 34, and by calibrations 35 and 36.
  • control depression is therefore equal to the depression at the nozzle 16 increased by a constant value corresponding to the reaction of the spring 19 relative to the effective surface of the membrane 17c of the pneumatic amplifier 17.
  • the complementary device constituted by the calibrations 23, 24 and the solenoid valve makes it possible to modify the balance of the membrane 17c by a leak in the upper chamber 17a of the pneumatic amplifier 17, as a function of a complementary parameter intervening by the contactor 26; this contactor acts in the direction of an increase in the control vacuum of the main valve 4, for example at the start of the transient acceleration phases.
  • the present invention therefore presents a simple and effective device for controlling the main recirculation valve 4 which is based on an additive amplification of a vacuum signal representative of the air flow admitted to the engine.
  • the arrangement relating to the pneumatic cylinder 8 of the main valve 4 and consisting of a lower chamber 10 made airtight with respect to the atmosphere makes it possible to eliminate leaks by guiding the valve support axis 7 and to ensure a better sealing at the level of the valve 7 by strengthening the action of the spring 9; moreover, in the case of supercharged engines, this arrangement makes it possible to compensate for the supercharging pressure by authorizing the opening of the recirculation valve 4 even during the supercharging phase.
  • the auxiliary device constituted by the low capacity decanter 27 and the calibration 28 makes it possible to avoid fuel accumulation in the amplifier 17 due to the existence of a circulation from the orifice to the nozzle 16 towards the orifice 20 (FIG. 1).
  • the manometric valve 29 regulates the intervention of a leak to the atmosphere towards the chamber 17a of the amplifier 17, through the calibration 24, when the vacuum at the nozzle exceeds a predetermined level, resulting in an increase in the opening signal of the recirculation valve 4.
  • the manometric valve 32 regulates the intervention of a leak to the atmosphere in the control circuit of the recirculation valve 4 through the calibration 36 when the vacuum at the manifold intake exceeds a predetermined level, which has the effect of reducing the opening signal in the low load zone, without appreciably affecting the regulation stage protected by calibration 35.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
EP83401978A 1982-10-11 1983-10-11 Dispositif de commande de recirculation des gaz d'échappement pour moteurs à combustion interne Expired EP0106760B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8216958A FR2534315A1 (fr) 1982-10-11 1982-10-11 Dispositif de commande de recirculation des gaz d'echappement pour moteurs a combustion interne
FR8216958 1982-10-11

Publications (2)

Publication Number Publication Date
EP0106760A1 EP0106760A1 (fr) 1984-04-25
EP0106760B1 true EP0106760B1 (fr) 1987-07-15

Family

ID=9278131

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83401978A Expired EP0106760B1 (fr) 1982-10-11 1983-10-11 Dispositif de commande de recirculation des gaz d'échappement pour moteurs à combustion interne

Country Status (5)

Country Link
US (1) US4479478A (enExample)
EP (1) EP0106760B1 (enExample)
DE (1) DE3372522D1 (enExample)
ES (1) ES8405888A1 (enExample)
FR (1) FR2534315A1 (enExample)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2662210B1 (fr) * 1990-05-21 1994-08-26 Renault Systeme de recirculation des gaz d'echappement d'un moteur a combustion interne, et moteur comportant un tel systeme.
US5611204A (en) * 1993-11-12 1997-03-18 Cummins Engine Company, Inc. EGR and blow-by flow system for highly turbocharged diesel engines

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3605709A (en) * 1969-03-19 1971-09-20 Nissan Motor Vehicular air-pollution preventive system
US3730156A (en) * 1971-11-24 1973-05-01 Chrysler Corp Exhaust gas recycling
AU6377573A (en) * 1973-01-02 1975-06-19 Ranco Inc Exhaust gas recirculating valve
US3998194A (en) * 1975-09-04 1976-12-21 Acf Industries, Incorporated System for control of exhaust gas recirculation
JPS5241710A (en) * 1975-09-30 1977-03-31 Toyota Motor Corp Internal combustion engine with auxiliary combustion chamber
US4106464A (en) * 1976-08-24 1978-08-15 Yamaha Hatsudoki Kabushiki Kaisha Programmed control system for a lean-burning internal combustion engine
JPS5369625U (enExample) * 1976-11-15 1978-06-12
JPS6014189B2 (ja) * 1978-06-16 1985-04-11 本田技研工業株式会社 排気環流量調節装置
JPS5614849A (en) * 1979-07-16 1981-02-13 Honda Motor Co Ltd Exhaust gas recirculating system for engine
US4325378A (en) * 1980-04-21 1982-04-20 Margaret Wilkinson Sports garment
JPS5762953A (en) * 1980-08-28 1982-04-16 Honda Motor Co Ltd Apparatus for controlling recirculation of exhaust gas in air-fuel ratio control device for internal combustion engine

Also Published As

Publication number Publication date
FR2534315A1 (fr) 1984-04-13
ES526355A0 (es) 1984-06-16
US4479478A (en) 1984-10-30
ES8405888A1 (es) 1984-06-16
EP0106760A1 (fr) 1984-04-25
FR2534315B1 (enExample) 1985-01-04
DE3372522D1 (en) 1987-08-20

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