EP1921301A2 - Agencement de recyclage de gaz d'échappement - Google Patents

Agencement de recyclage de gaz d'échappement Download PDF

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Publication number
EP1921301A2
EP1921301A2 EP07019452A EP07019452A EP1921301A2 EP 1921301 A2 EP1921301 A2 EP 1921301A2 EP 07019452 A EP07019452 A EP 07019452A EP 07019452 A EP07019452 A EP 07019452A EP 1921301 A2 EP1921301 A2 EP 1921301A2
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
valve body
inlet
radiator
inlet channel
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.)
Granted
Application number
EP07019452A
Other languages
German (de)
English (en)
Other versions
EP1921301A3 (fr
EP1921301B1 (fr
Inventor
Hans-Patrick Nolze
Istvan Nemeth
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.)
Benteler Automobiltechnik GmbH
Original Assignee
Benteler Automobiltechnik GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Benteler Automobiltechnik GmbH filed Critical Benteler Automobiltechnik GmbH
Publication of EP1921301A2 publication Critical patent/EP1921301A2/fr
Publication of EP1921301A3 publication Critical patent/EP1921301A3/fr
Application granted granted Critical
Publication of EP1921301B1 publication Critical patent/EP1921301B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F02M26/65—Constructional details of EGR valves
    • F02M26/70—Flap valves; Rotary valves; Sliding valves; Resilient 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
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/25—Layout, e.g. schematics with coolers having bypasses
    • F02M26/26—Layout, e.g. schematics with coolers having bypasses characterised by details of the bypass valve
    • 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
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/30—Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine

Definitions

  • the invention relates to an exhaust gas recirculation arrangement with the features in the preamble of patent claim 1.
  • Exhaust gas recirculation (EGR) with electromotive, continuously variable flow control is mandatory to meet current and future emission standards for direct injection gasoline and diesel engines.
  • EGR exhaust gas recirculation
  • part of the burned exhaust gas is taken from the exhaust manifold and fed back to the intake mixture via a pipe on the intake manifold.
  • EGR valve With an electronically actuated EGR valve, the EGR rate is continuously adjusted to the demand calculated by the engine control with the required dynamics. In this way, a portion of the exhaust gas is burned twice and the desired effects for reducing NOx emissions are achieved.
  • Diesel engines require due to the much higher recirculation rates and the associated higher temperatures of Ansauggemisches additionally a liquid-air heat exchanger to reduce the exhaust gas temperature of about 450 ° C to 150 ° C to 200 ° C.
  • Such EGR coolers have a pneumatic bypass flap, with which the cooler in the Cold operation can be switched off. In this way it is ensured that the exhaust gas temperature necessary for the full function in the catalytic converter and in a soot particle filter is reached as quickly as possible after the cold start of the engine. It is known to manufacture the cooler and the bypass flap made of stainless steel and to combine it into a structural unit. In addition, however, a valve for regulating the amount of exhaust gas required to be placed either in front of or behind the radiator is required.
  • a rotary flap valve is used with a rotatable valve plate mounted on an axle, which can be swiveled by a maximum of 90 °.
  • the second type of valve is a plunger valve, in which via a translational stroke of the plunger, a lift height corresponding cross section in the exhaust pipe is released to the exhaust gas flow.
  • the present invention seeks to combine the functions of a cooler bypass setting and the function of volume control in space-saving manner in a combined actuator.
  • a cooler which is coupled to a valve housing, which has in known manner an inlet channel and an outlet channel for the exhaust gas to be supplied to and removed from the cooler.
  • a driven by an actuator valve body is arranged, which serves on the one hand to change the flow rate of the exhaust gas in the radiator, on the other hand, but also takes over the bypass control. Through this valve body can be determined whether the exhaust gas should flow through the radiator or not.
  • valve body is a piston displaceable linearly within a valve housing, through which the interior of the valve housing is divided into an inlet chamber and an outlet chamber, wherein the cooler inlet is connected to the inlet chamber of the radiator inlet and to the outlet chamber.
  • the essential feature of this arrangement is the orientation of the inlet channel, which opens transversely to the stroke direction of the valve body in the interior and thereby at least partially from a peripheral lateral surface of the valve body, i. also completely lockable.
  • the inlet channel is therefore not closed as usual by the piston surface, but by the piston skirt surface.
  • the Kolbenober- and -unterseite are respectively facing the inlet and outlet chamber, so that they are fluid-tightly sealed against each other.
  • the inlet chamber can be made smaller and at the same time the outlet chamber can be enlarged.
  • the outlet chamber can also be made smaller and the inlet chamber can be enlarged at the same time. Since the inlet channel is at least partially released by a displacement of the valve body, exhaust gas flows either into the inlet chamber or directly into the outlet chamber, bypassing the radiator.
  • the special feature is that over a partial coverage of the inlet channel not only the deflection direction the exhaust gas within the valve housing, but also the amount of exhaust gas can be controlled.
  • the EGR assembly may be made of stainless steel or e.g. made of cast steel and is therefore heat resistant executable, as a valve body made of aluminum. Since the coolers are usually made of stainless steel, the same materials can be used for the radiator and arranged on the radiator valve unit. Another advantage is that the actuator in the form of an electric actuator can be attached directly to the valve housing. The actuator can be integrated directly into a cover that covers the inlet chamber of the valve body.
  • valve body In principle, it is possible within the scope of the invention to make the interior of the valve housing non-circular. However, it is considered expedient to design the piston-shaped valve body cylindrical, as well as cylindrical sealant are used in this way.
  • the valve body should have an upper and a lower seal, which are arranged at a distance from one another which is greater than the diameter or the height of the inlet channel measured in the stroke direction. In this way it is possible to position the area of the valve body lying between the seals in such a way that the inlet channel is completely blocked. In any case, however, it is ensured that exhaust gases can not pass directly from the inlet chamber to the outlet chamber or directly from the outlet chamber to the inlet chamber, bypassing the radiator.
  • the intake passage is wider than high, with the height of the intake passage being measured in the lift direction.
  • the inlet channel may e.g. be configured slot-shaped and thereby distribute over a larger segment of the housing. In this way it is possible to use in a very space-saving design valve body with low height, thereby saving space and weight.
  • the amount of exhaust gas flowing into the valve housing is regulated by the position of the valve body.
  • the inlet channel is arranged at an angle between 60 ° and 90 ° to the stroke direction.
  • the thickness of the valve body or of the piston is dimensioned so that it completely releases the cross-section of the inlet channel in the bypass position, in which exhaust gas flows directly into the outlet chamber.
  • the valve body should be positionable so that the inlet channel is completely free.
  • the inlet channel is therefore advantageously arranged centrally between the radiator inlet and the radiator outlet, wherein the inlet duct is preferably arranged opposite the radiator inlet and the radiator outlet for flow and design reasons.
  • FIG. 1 shows the basic structure of the EGR arrangement 1 according to the invention, consisting of a cooler 2 and a valve housing 3 with an actuator 4.
  • the valve housing 3 is cylindrical or has a cylindrically shaped interior 5, which is divided into an inlet chamber 6 above and an outlet chamber 8 below the piston-shaped valve body 7. Via a slot-shaped inlet channel 9, as can be seen in Figures 1 and 5, the interior 5 of the valve housing 3 at an intermediate level exhaust gas is supplied, which is supplied depending on the position of the valve body 7 either the inlet chamber 6 or the outlet 8. From the inlet chamber 6, the exhaust gas passes through a radiator inlet 10 into the interior of the radiator 2, where it is diverted in a U-shape and fed to a radiator outlet 11 which opens below the piston-shaped valve body 7 into the outlet chamber 8.
  • the outlet chamber 8 is connected to the end face of the cylindrical interior 5 with an outlet channel 12, via which the exhaust gas can again emerge from the valve housing 3.
  • the basic flow paths of the exhaust gas within the EGR arrangement can be recognized on the basis of the arrows drawn in FIGS. 3 and 4.
  • valve body 7 is located at its bottom in the image plane dead center and is therefore extended maximum. In this position, exhaust gas can flow in via the inlet channel 9 exclusively into the inlet chamber 6 and is thus completely fed to the radiator 2. The valve body 7 is thus in a cooling position.
  • valve body 7 is in its top dead center in the image plane, so that the cooler inlet 10 is blocked and the inlet channel 9 opens into the outlet chamber 8, so that the exhaust gas is supplied directly to the outlet channel 12 in accordance with the arrows shown.
  • the radiator 2 is completely bypassed in this position of the valve body 7. In principle, intermediate positions between the bypass position and the cooling position in Figures 3 and 4 are possible.
  • the valve body 7 is dimensioned such that its lateral surface 13 completely covers the mouth of the inlet channel 9 and seals by means of an upper and lower seal 14, 15 in each case opposite the inlet chamber 6 and the outlet chamber 7 (FIG. 2).
  • valve body 7 If the valve body 7 is displaced upwards only slightly from this central position, a partial region of the inlet channel 9 is released, so that a small amount of exhaust gas can be supplied to the outlet chamber 8. In this way, not only the exhaust gas direction, but also the amount of exhaust gas can be controlled with a single valve body 7. In addition, only a single actuator 4 is required, which drives a piston rod 16 which passes through the inlet chamber 6. Conversely, via a slight deflection of the valve body 7 down a metered amount of exhaust gas can be supplied to the radiator 2.
  • Decisive in the exhaust gas recirculation arrangement is that the inlet channel 9 is arranged transversely to the stroke direction H in the central region between the radiator inlet 10 and the radiator outlet 11.
  • the intake passage 9 is slightly inclined to the moving axis of the valve body 7. In this way, the amount of exhaust gas can be better dosed.
  • FIG. 6 An exemplary representation of the opening cross section of the inlet channel plotted against the position of the valve body (piston stroke) can be found in FIG. 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Multiple-Way Valves (AREA)
  • Fluid-Driven Valves (AREA)
EP07019452.7A 2006-11-09 2007-10-04 Agencement de recyclage de gaz d'échappement Expired - Fee Related EP1921301B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006053205A DE102006053205A1 (de) 2006-11-09 2006-11-09 Abgasrückführungsanordnung

Publications (3)

Publication Number Publication Date
EP1921301A2 true EP1921301A2 (fr) 2008-05-14
EP1921301A3 EP1921301A3 (fr) 2012-04-11
EP1921301B1 EP1921301B1 (fr) 2013-12-25

Family

ID=39036329

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07019452.7A Expired - Fee Related EP1921301B1 (fr) 2006-11-09 2007-10-04 Agencement de recyclage de gaz d'échappement

Country Status (2)

Country Link
EP (1) EP1921301B1 (fr)
DE (1) DE102006053205A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104747324A (zh) * 2015-04-25 2015-07-01 无锡隆盛科技股份有限公司 旁通式egr冷却器
CN104775945A (zh) * 2015-04-25 2015-07-15 无锡隆盛科技股份有限公司 汽车发动机用egr阀集成装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008032884B4 (de) 2008-07-14 2018-09-20 Mahle International Gmbh Ventileinrichtung, Wärmetauscher und Aufladesystem zur Aufladung einer Brennkraftmaschine mit einem Ladefluid

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1363013A1 (fr) * 2002-05-15 2003-11-19 Behr GmbH & Co. KG Echangeur de chaleur
FR2872862A1 (fr) * 2004-07-09 2006-01-13 Renault Sas Dispositif de commande pour un circuit de recirculation de gaz d'echappement d'un moteur a combustion interne

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1363013A1 (fr) * 2002-05-15 2003-11-19 Behr GmbH & Co. KG Echangeur de chaleur
FR2872862A1 (fr) * 2004-07-09 2006-01-13 Renault Sas Dispositif de commande pour un circuit de recirculation de gaz d'echappement d'un moteur a combustion interne

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104747324A (zh) * 2015-04-25 2015-07-01 无锡隆盛科技股份有限公司 旁通式egr冷却器
CN104775945A (zh) * 2015-04-25 2015-07-15 无锡隆盛科技股份有限公司 汽车发动机用egr阀集成装置

Also Published As

Publication number Publication date
DE102006053205A1 (de) 2008-05-15
EP1921301A3 (fr) 2012-04-11
EP1921301B1 (fr) 2013-12-25

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