EP0658691B1 - Dispositif de recirculation de gaz d'échappement pour moteur à combustion interne équipé d'un frein d'échappement - Google Patents

Dispositif de recirculation de gaz d'échappement pour moteur à combustion interne équipé d'un frein d'échappement Download PDF

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Publication number
EP0658691B1
EP0658691B1 EP94118145A EP94118145A EP0658691B1 EP 0658691 B1 EP0658691 B1 EP 0658691B1 EP 94118145 A EP94118145 A EP 94118145A EP 94118145 A EP94118145 A EP 94118145A EP 0658691 B1 EP0658691 B1 EP 0658691B1
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Prior art keywords
exhaust
egr
valve
gas
control valve
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Expired - Lifetime
Application number
EP94118145A
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German (de)
English (en)
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EP0658691A1 (fr
Inventor
Hisashi Ohki
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Toyota Motor Corp
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Toyota Motor Corp
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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
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
    • F02D9/06—Exhaust brakes
    • 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
    • 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
    • F02M26/59—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
    • F02M26/615—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor in response to exhaust pressure the exhaust back pressure

Definitions

  • the present invention relates to an EGR (exhaust-gas recirculation) device of an internal combustion engine equipped with an exhaust-gas brake, and more specifically to an EGR device of an internal combustion engine equipped with an exhaust-gas brake, which can prevent an undesirable recirculation of the exhaust-gas through the EGR device when the exhaust-gas brake is operated.
  • EGR exhaust-gas recirculation
  • an exhaust-gas recirculation (hereafter referred to as EGR) device In order to reduce the amount of NOx (nitrogen oxides) in the exhaust-gas, an exhaust-gas recirculation (hereafter referred to as EGR) device has been used.
  • the EGR device recirculates exhaust-gas to an air-intake passage via a recirculation passage (hereafter referred to as an EGR passage) usually provided between an exhaust manifold and an intake manifold.
  • an EGR control valve is usually provided within the EGR passage. This EGR control valve controls the amount of exhaust-gas supplied to the air-intake passage.
  • an exhaust-gas brake device In a large vehicle, such as a truck, a bus, and such like, an exhaust-gas brake device is used as an assisting brake system.
  • the exhaust-gas brake device has a cutoff valve disposed midway in the exhaust-gas passage. When the cutoff valve is closed, the exhaust-gas passage is blocked, thereby increasing the backpressure.
  • the increased backpressure creates a braking action at the engine of the vehicle by means of increased pumping resistance.
  • a conventional exhaust-gas brake is operated, and if the backpressure increases above a certain pressure, the exhaust valves of the engine are forcibly pushed open by means of the backpressure during the intake cycle. As a result, the opening of the exhaust valves allows exhaust-gas to escape from the exaust passage, thereby preventing the backpressure exceeding the predetermined value.
  • the increase in backpressure due to the operation of the exhaust-gas brake causes the EGR control valve to be forcibly pushed open. If the EGR control valve is forcibly opened, it allows exhaust-gas to escape via the EGR passage, resulting in a drop in backpressure and leading to the problem of a reduction in the exhaust-gas braking action.
  • an EGR device which increases the opening force on the EGR control valve when the exhaust-gas brake is operated, is proposed in the Japanese Unexamined Utility Model Publication No. 63-79463.
  • the stem of the EGR control valve is mounted on a diaphragm provided in a diaphragm chamber of the EGR device.
  • the diaphragm chamber is divided, into an opening pressure chamber, with a spring inside thereof and a closing pressure chamber by the diaphragm.
  • the opening pressure of the EGR control valve is set by the spring in the opening pressure chamber.
  • the EGR control valve closing pressure chamber is open to atmospheric pressure.
  • the EGR control valve is opened by applying a vacuum which exceeds the closing force of the spring provided inside the opening pressure chamber.
  • vacuum is applied to the closing pressure chamber of the EGR control valve to increase the force required to open the EGR control valve. That is, when a vacuum is applied to the closing pressure chamber of the EGR control valve, the force required to open the EGR control valve becomes the sum of the closing force of the spring inside the opening pressure chamber and the force of the vacuum applied to the closing pressure chamber.
  • the force of the vacuum is due to the pressure difference between the atmospheric pressure and the vacuum.
  • the sum of the closing force of the spring and the force of the vacuum is greater than normal force. Therefore, if backpressure from the exhaust-gas passage is applied to the valve of the EGR control valve when the exhaust-gas brake is operated, the EGR control valve will not open.
  • VSV vacuum switching valve
  • the exhaust valves of cylinders that are in the intake cycle open at a lower pressure than the EGR control valve when the exhaust-gas brake is operated and the backpressure on the upstream side from the exhaust-gas brake valve rises, since the valve opening pressure of the exhaust valve is set to a value which provides a suitable exhaust-gas braking force and is lower than the pressure required to open the EGR control valve of the EGR device.
  • the EGR control valve does not open, and there is no leakage of exhaust-gas towards the air-intake manifold side and a suitable exhaust-gas braking force is provided.
  • FIG. 1 shows the overall configuration of an EGR device of an internal combustion engine with an exhaust-gas brake according to the present invention.
  • reference numeral 1 denotes a 4-cylinder internal combustion engine
  • 2 denotes an air-intake manifold
  • 3 denotes an exhaust manifold
  • 4 denotes an exhaust passage
  • 5 denotes an exhaust-gas brake device having a exhaust-gas control valve 51 provided within the exhaust-gas passage 4
  • 6 denotes a muffler
  • 7 denotes an exhaust-gas recirculation passage (EGR passage) which brings exhaust-gas from the exhaust manifold 3 to the air-intake manifold 2
  • 8 denotes an EGR control valve
  • 9 denotes a vacuum pump
  • 10 denotes a control circuit
  • 11 and 12 denote control valves which are open/close controlled by the control circuit 10
  • 13 denotes a vacuum intake pipe.
  • the vacuum intake pipe 13 supplies vacuum from the vacuum pump 9 to the exhaust-gas brake device 5 via the control valve 11 and
  • the EGR control valve 8 is opened when vacuum from the vacuum pump 9 is brought in through the vacuum intake pipe 13 via the control valve 12, after the control valve 12 is opened by a signal from the control circuit 10.
  • exhaust-gas is returned, from exhaust-gas manifold 3 via the EGR passage 7, to air-intake manifold 2, thereby reducing the amount of NOx in the exhaust-gas.
  • the exhaust-gas brake device 5 is operated when the control circuit 10 detects a reduction in the speed of the vehicle.
  • the control circuit 10 detects a reduction in the speed of the vehicle, the control circuit 10 sends a signal to open the control valve 11.
  • vacuum from the vacuum pump 9 is applied to the exhaust-gas brake device 5, through the vacuum intake pipe 13, to close the exhaust-gas control valve 51.
  • the closure of the exhaust-gas control valve 51 causes exhaust-gas to be trapped in the exhaust-gas pipe 4 and within the EGR pipe 7, thereby increasing the backpressure.
  • the pumping resistance of the engine piston increases to act as a brake.
  • the pressure required to open the exhaust valve 5 by the backpressure is set higher than the lower limit value at which it is possible to achieve exhaust-gas-braking force, and the pressure required to open the EGR control valve 8 by the backpressure is set higher than the same to open the exhaust valve 5.
  • Figure 3 is a configuration diagram which includes a cross-sectional view that shows the details of an EGR control valve 8 and an exhaust valve 30 which is provided in the internal combustion engine 1, with the exhaust-gas brake shown in Fig. 1.
  • reference numeral 14 denotes an intake passage which is connected to an air-intake manifold 2
  • 15 denotes an air-intake-control valve which is provided within the air-intake passage 14
  • 16 denotes an air-intake port
  • 17 denotes a combustion chamber
  • 18 denotes a piston
  • 19 denotes an exhaust port
  • 20 denotes an air-intake valve.
  • Exhaust valve 30 has a valve 31 which opens and closes the exhaust port 19, a spring 32 which applies force in the direction which causes the valve 31 to close the exhaust port 19, and an exhaust cam 33 for the purpose of opening the valve 31 in opposition to the force of the spring 32.
  • the EGR control valve 8 is divided into a valve part 8A and a valve-drive part 8B.
  • the valve drive part 8B has a housing 88 which is separated into an atmospheric pressure chamber 88A and a vacuum chamber 88B by a diaphragm 83.
  • a spring 84 is located inside the vacuum chamber 88B.
  • the end of the valve stem 82 is connected to the diaphragm 83 inside the atmospheric pressure chamber 88A.
  • the spring 84 applies force to the diaphragm 83 in a direction that causes the valve 81 to close.
  • the reason the overall rise in pressure stops after the passage of time is that when the backpressure reaches the closing force set on the spring 32 of the exhaust valve 30, the valve 31 of the exhaust valve 30 of the cylinder in the air-intake cycle is pushed downward by the backpressure.
  • the opening of the exhaust valve 30 of the cylinder in the air-intake cycle causes the exhaust-gas to escape to the combustion chamber 17 of the cylinder in the air-intake cycle.
  • the EGR control valve 8 opens at a lower pressure than the exhaust valve 30, when the exhaust control valve 51 closes the exhaust-gas passage 4 to cause a rise in backpressure.
  • the EGR control valve 8 opens at a lower pressure than the exhaust valve 30 when the exhaust-gas-brake device 5 is operated, the backpressure in the exhaust-gas passage 4 drops and the braking performance of the exhaust-gas brake falls.
  • the opening pressure required to open the exhaust valve 30 is set to a value that provides a suitable exhaust braking performance.
  • the closing force of the spring 84 of the EGR control valve 8 is set to a value higher than the closing force of the spring 32 of the exhaust valve 30 to prevent a reduction in the exhaust-gas braking performance due to the opening operation of the EGR control valve 8.
  • valve-closing-force of the spring 32 of the exhaust valve 30 Examples of calculations of the valve-closing-force of the spring 32 of the exhaust valve 30 and the valve-closing-force of the spring 84 of the EGR control valve 8 are shown below.
  • reference Dex denotes the surface diameter over which backpressure is applied to valve body 31 of exhaust valve 30 in the opening direction
  • Pex denotes the backpressure required when the exhaust-gas brake is operated (this value depends on the type of the vehicle)
  • Degr denotes the surface diameter over which backpressure is applied to valve 81 of the EGR control valve 8 in the opening direction.
  • Fex [ ⁇ ⁇ (Dex) 2 ⁇ Pex] ⁇ 1/4 1 ⁇
  • Fegr is the valve-closing-force of the spring 84 of EGR control valve 8
  • Fegr is expressed by the following equation 2 : Fegr ⁇ [ ⁇ ⁇ (Degr) 2 ⁇ Pex] ⁇ 1/4 2 ⁇
  • valve-closing-force Fegr of the spring 84 of the EGR control valve 8 should be determined so as to achieve the value of force determined according to the equation 4 .
  • the EGR device of an internal combustion engine with an exhaust-gas brake according to the present invention to control the backpressure to produce a suitable exhaust brake force when the exhaust-gas-brake device 5 is operated, because the exhaust valve 30 opens at a lower backpressure than the EGR control valve 8.
  • the EGR device of the present invention produces a suitable exhaust-gas-braking force in an internal combustion engine using an exhaust-gas brake device.
  • a suitable exhaust-gas-brake force can be obtained by setting the opening pressure required to open the exhaust-gas valve to a value which allows the production of a suitable exhaust-gas-braking force but lower than the opening pressure required to open the EGR control valve of EGR device.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Claims (2)

  1. Dispositif de mise en circulation de gaz d'échappement CGE d'un moteur à combustion interne (1) ayant un dispositif de freinage à gaz d'échappement (5) qui coupe temporairement la circulation du gaz d'échappement à l'intérieur d'un passage de gaz d'échappement (4) de manière à y produire une contre-pression (Pech), ledit dispositif CGE comprenant une soupape de commande CGE (8) et un passage CGE (7) qui renvoie une partie dudit gaz d'échappement depuis ledit passage d'échappement (4) en amont dudit dispositif de freinage à gaz d'échappement (5) à un collecteur d'admission d'air (2) dudit moteur (1), dans lequel ledit moteur (1) comprend une soupape d'échappement (31) pour connecter sélectivement une chambre de combustion (17) dudit moteur (1) audit passage d'échappement (4), ladite soupape d'échappement (31) étant sollicitée dans la position fermée au moyen d'un ressort (32), et dans lequel ladite soupape de commande CGE (8) comprend une soupape CGE (81) sollicitée dans la position fermée au moyen d'un ressort (84), caractérisé en ce que ladite soupape d'échappement (31) et son ressort (32), et ladite soupape CGE (81) et son ressort (84) satisfont la relation : F cge ≥ F ech * (D cge / D ech ) 2 ,
    Figure imgb0007
     dans laquelle Fcge est la force de fermeture du ressort (84) de la soupape CGE (81), Fech est la force de fermeture du ressort (32) de la soupape d'échappement (31), Dcge est le diamètre de la surface de la soupape CGE (81) sur laquelle agit ladite contre-pression (Pech), et Dech est le diamètre de la surface de la soupape d'échappement (31) sur laquelle agit la contre-pression (pech).
  2. Dispositif CGE selon la revendication 1, dans lequel ledit dispositif de freinage à gaz d'échappement (5) et ladite soupape de commande CGE (8) sont commandés par le vide produit par une pompe à vide (9).
EP94118145A 1993-11-19 1994-11-17 Dispositif de recirculation de gaz d'échappement pour moteur à combustion interne équipé d'un frein d'échappement Expired - Lifetime EP0658691B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP290702/93 1993-11-19
JP29070293A JP3156470B2 (ja) 1993-11-19 1993-11-19 排気ブレーキ付内燃機関

Publications (2)

Publication Number Publication Date
EP0658691A1 EP0658691A1 (fr) 1995-06-21
EP0658691B1 true EP0658691B1 (fr) 1997-03-19

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EP94118145A Expired - Lifetime EP0658691B1 (fr) 1993-11-19 1994-11-17 Dispositif de recirculation de gaz d'échappement pour moteur à combustion interne équipé d'un frein d'échappement

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EP (1) EP0658691B1 (fr)
JP (1) JP3156470B2 (fr)
DE (1) DE69402160T2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE506881C2 (sv) 1997-03-14 1998-02-23 Scania Cv Ab Förfarande för styrning av en förbränningsmotor vid start och motor för genomförande av förfarandet
DE19940264B4 (de) * 1999-08-25 2008-08-07 Robert Bosch Gmbh Verfahren zum Bremsen eines Verbrennungsmotors eines Kraftfahrzeugs
AT411545B (de) * 2001-05-14 2004-02-25 Man Steyr Ag Brennkraftmaschine in einem fahrzeug mit einer motorbremsvorrichtung und einer abgasrückführeinrichtung
DE102005017863A1 (de) * 2005-04-19 2006-11-02 Dr.Ing.H.C. F. Porsche Ag Abgasabführungssystem für eine Brennkraftmaschine sowie Absperrklappe für ein Abgasabführungssystem

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56528A (en) * 1979-06-15 1981-01-07 Aisin Seiki Co Ltd Exhaust brake
JPS60243329A (ja) * 1984-05-16 1985-12-03 Mitsubishi Motors Corp エンジンの過給装置
JPS6379463U (fr) * 1986-11-13 1988-05-25
JP2590579B2 (ja) * 1990-03-08 1997-03-12 トヨタ自動車株式会社 ディーゼル機関の排気ガス再循環装置
JPH05180010A (ja) * 1991-12-27 1993-07-20 Fuji Oozx Kk 排気ブレーキの制御装置
JPH06147025A (ja) * 1992-11-11 1994-05-27 Toyota Motor Corp 排気還流装置
JPH06241071A (ja) * 1993-02-19 1994-08-30 Jidosha Kiki Co Ltd エキゾーストブレーキバルブ装置

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Publication number Publication date
EP0658691A1 (fr) 1995-06-21
JPH07139377A (ja) 1995-05-30
DE69402160D1 (de) 1997-04-24
JP3156470B2 (ja) 2001-04-16
DE69402160T2 (de) 1997-08-28

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