EP1435451A2 - AGR-Ventil für einen turbogeladenen Dieselmotor - Google Patents

AGR-Ventil für einen turbogeladenen Dieselmotor Download PDF

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Publication number
EP1435451A2
EP1435451A2 EP03104550A EP03104550A EP1435451A2 EP 1435451 A2 EP1435451 A2 EP 1435451A2 EP 03104550 A EP03104550 A EP 03104550A EP 03104550 A EP03104550 A EP 03104550A EP 1435451 A2 EP1435451 A2 EP 1435451A2
Authority
EP
European Patent Office
Prior art keywords
actuator
valve
egr
closure member
egr valve
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.)
Withdrawn
Application number
EP03104550A
Other languages
English (en)
French (fr)
Other versions
EP1435451A3 (de
Inventor
Timothy Mark Lancefield
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.)
Mechadyne PLC
Original Assignee
Mechadyne PLC
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 Mechadyne PLC filed Critical Mechadyne PLC
Publication of EP1435451A2 publication Critical patent/EP1435451A2/de
Publication of EP1435451A3 publication Critical patent/EP1435451A3/de
Withdrawn legal-status Critical Current

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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
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/55—Systems for actuating EGR valves using vacuum actuators
    • 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
    • F02M26/66—Lift valves, e.g. poppet valves
    • F02M26/67—Pintles; Spindles; Springs; Bearings; Sealings; Connections to actuators
    • 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
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • 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
    • F02M26/40—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with timing means in the recirculation passage, e.g. cyclically operating valves or regenerators; with arrangements involving pressure pulsations
    • 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
    • F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
    • F02M26/54—Rotary actuators, e.g. step motors

Definitions

  • the present invention relates to an exhaust gas re-circulation (EGR) valve for use in a turbocharged Diesel engine to improve the transient torque rise rate when operating with high levels of EGR.
  • EGR exhaust gas re-circulation
  • VGT variable geometry turbines
  • Opening the VGT nozzles reduces boost, much as a waste-gate would, but it also reduces the exhaust back pressure on the engine.
  • Conversely closing the turbine nozzles can be used to increase the pressure difference across the engine to increase EGR, a function that would previously have been carried out by an intake throttle.
  • Modern EGR valves are continuously variable and position controlled, rather than on/off valves, and as a consequence the EGR valve and the VGT interact to provide the required amount of EGR. Because of this, they need relatively sophisticated controllers and control strategies.
  • transient torque rise is a function of how quickly the air flow can be increased.
  • VVA variable valve actuation
  • the present invention seeks to provide an EGR valve that is capable of reducing the EGR flow as quickly as possible to enable the mass flow through the compressor and turbine to be increased.
  • an EGR valve for a turbocharged diesel engine having a valve closure member movable relative to a mating surface for regulating the flow of EGR gases and a first actuator for enabling the position of the valve closure member to be varied continuously, characterised in that a second actuator is provided to close the valve fully regardless of the position of the first actuator, so as to enable the EGR flow to be reduced more rapidly than can be achieved by said first actuator alone.
  • the closure member is axially displaceable by both the first and the second actuator and the second actuator is operative to apply to the valve closure member a force significantly greater than the force applied by the first actuator.
  • valve closure member is formed by a hollow body that is rotatable by the first actuator and has a flow regulating aperture in its wall and the second actuator acts on a plug for obstructing the flow regulating aperture of the valve closure member.
  • FIG. 1 there is shown an EGR duct 10 which is connected at one end to the intake system of an engine and at its other end to the engine exhaust system.
  • the flow of EGR gases along the duct 10 is controlled by an EGR valve which comprises a closure member 12 moved by means of a first vacuum operated actuator 16 towards and away from a mating surface 14, having the form of a valve seat defined within the EGR duct 10.
  • the actuator 16 is generally conventional and need not therefore be described in detail.
  • the illustrated actuator 16 comprises a diaphragm biased by a spring in a direction to close the EGR valve.
  • the closure member 12 By applying a vacuum to the working chamber above the diaphragm, the closure member 12 is raised off its seat 14 to open the EGR valve.
  • the valve opening defined between the closure member 12 and the seat 14 is continuously variable by appropriately modulating the applied vacuum. It should be appreciated in this context that the actuator 16 need not necessarily be vacuum operated and that it could instead be powered electrically or by means of compressed gas.
  • the actuator 16 is not in itself capable of closing the EGR valve rapidly and for this purpose the embodiment shown in Figure 1 is provided with a second actuator 18.
  • the actuator 18 has a larger diaphragm and a stronger spring than the first actuator 16.
  • the spring is normally held compressed by a vacuum so that the actuator 18 is normally ineffective.
  • the working chamber of the actuator 18 is connected to atmosphere whereupon the strong spring within the actuator 18 extends its output rod and moves the whole of the first actuator 16 in a direction to close the EGR valve. Because of the strength of the spring in the second actuator the EGR valve will be closed quickly regardless of the position of the diaphragm of the actuator 16.
  • the actuator 18 may alternatively be powered electrically or by means of compressed gas.
  • the EGR valve is a rotary valve having a closure member 12' mounted in an EGR duct 10' and rotated by a rotary actuator 16'.
  • the closure member 12' which is also shown separately in perspective in the drawing, is a hollow body having a flow regulating aperture in its wall, which is covered to a greater or lesser extent as the closure member 12' is rotated to regulate the flow of EGR gases along the duct 10'.
  • a linear actuator 26 acts on a plug 24 which is movable into the hollow closure member 12' of the rotary valve to cover the flow regulating aperture completely regardless of the angular position of the closure member 12'.
  • the position of the closure members 12 and 12' in the previously described embodiments is determined by the level of vacuum applied to their actuators and this is typically set by a vacuum modulator having a slow response time.
  • the opening of the EGR valve need only occur at its normal rate as determined by the speed at which the actuator 16 or 16' can move the closure member 12 or 12' of the EGR valve.
  • the desired rapid shut-off of the valve is achieved in each case by the use of the second actuator 18 or 26.

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)
EP03104550A 2003-01-03 2003-12-04 AGR-Ventil für einen turbogeladenen Dieselmotor Withdrawn EP1435451A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0300059 2003-01-03
GB0300059A GB2396885A (en) 2003-01-03 2003-01-03 Turbocharged diesel engine with means for rapidly reducing EGR flow

Publications (2)

Publication Number Publication Date
EP1435451A2 true EP1435451A2 (de) 2004-07-07
EP1435451A3 EP1435451A3 (de) 2006-04-19

Family

ID=9950613

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03104550A Withdrawn EP1435451A3 (de) 2003-01-03 2003-12-04 AGR-Ventil für einen turbogeladenen Dieselmotor

Country Status (2)

Country Link
EP (1) EP1435451A3 (de)
GB (1) GB2396885A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2053232A1 (de) * 2007-10-23 2009-04-29 Aisan Kogyo Kabushiki Kaisha Durchflussschaltventil
DE102008003177A1 (de) * 2008-01-04 2009-07-09 Continental Automotive Gmbh Abgasrückführventil für ein Kraftfahrzeug
EP2778485A1 (de) * 2013-03-13 2014-09-17 Kohler Mira Limited Ventil
US9182047B2 (en) 2013-03-13 2015-11-10 Kohler Mira Limited Valve with fail-safe device

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5491619A (en) * 1977-12-29 1979-07-20 Toyota Motor Corp Exhaust gas recirculation apparatus
JPS55156244A (en) * 1979-05-21 1980-12-05 Nissan Motor Co Ltd Device for mitigating influence of speed reduction of internal combustion engine
JPS56159555A (en) * 1980-05-12 1981-12-08 Nissan Motor Co Ltd Exhaust gas recirculation control system
US4398524A (en) * 1981-07-24 1983-08-16 Ford Motor Company Exhaust gas recirculation system
EP0512139A1 (de) * 1991-05-07 1992-11-11 Siemens Aktiengesellschaft Elektromotorischer Stellantrieb
JPH07166969A (ja) * 1993-12-14 1995-06-27 Nissan Motor Co Ltd エンジンの排気還流制御装置
JP3412347B2 (ja) * 1995-05-22 2003-06-03 三菱電機株式会社 排気ガス再循環制御弁
US5606957A (en) * 1995-12-06 1997-03-04 Caterpillar Inc. Control system for exhaust gas recirculation
JP3652808B2 (ja) * 1996-08-26 2005-05-25 日野自動車株式会社 過給機付き多気筒エンジンの排気ガス再循環装置

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2053232A1 (de) * 2007-10-23 2009-04-29 Aisan Kogyo Kabushiki Kaisha Durchflussschaltventil
DE102008003177A1 (de) * 2008-01-04 2009-07-09 Continental Automotive Gmbh Abgasrückführventil für ein Kraftfahrzeug
WO2009087019A1 (de) * 2008-01-04 2009-07-16 Continental Automotive Gmbh Abgasrückführventil für ein kraftfahrzeug
US8127796B2 (en) 2008-01-04 2012-03-06 Continental Automotive Gmbh Exhaust gas recirculation valve for a motor vehicle
EP2778485A1 (de) * 2013-03-13 2014-09-17 Kohler Mira Limited Ventil
US9182047B2 (en) 2013-03-13 2015-11-10 Kohler Mira Limited Valve with fail-safe device
US9644757B2 (en) 2013-03-13 2017-05-09 Kohler Mira Limited Valve with fail-safe device
US10443751B2 (en) 2013-03-13 2019-10-15 Kohler Mira Limited Valve with fail-safe device

Also Published As

Publication number Publication date
EP1435451A3 (de) 2006-04-19
GB0300059D0 (en) 2003-02-05
GB2396885A (en) 2004-07-07

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