EP1278953A1 - Appareil de soupape rge - Google Patents

Appareil de soupape rge

Info

Publication number
EP1278953A1
EP1278953A1 EP01932903A EP01932903A EP1278953A1 EP 1278953 A1 EP1278953 A1 EP 1278953A1 EP 01932903 A EP01932903 A EP 01932903A EP 01932903 A EP01932903 A EP 01932903A EP 1278953 A1 EP1278953 A1 EP 1278953A1
Authority
EP
European Patent Office
Prior art keywords
valve
shaft
exhaust gas
recited
opposing
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
EP01932903A
Other languages
German (de)
English (en)
Other versions
EP1278953B1 (fr
EP1278953A4 (fr
Inventor
Dimitri L. Vamvakitis
Richard J. Vaughan
Jerry L. Holden
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.)
Cooper Standard Automotive Inc
Original Assignee
Cooperstandard Automotive Fluid Systems
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 Cooperstandard Automotive Fluid Systems filed Critical Cooperstandard Automotive Fluid Systems
Priority claimed from PCT/US2001/014200 external-priority patent/WO2001083975A1/fr
Publication of EP1278953A1 publication Critical patent/EP1278953A1/fr
Publication of EP1278953A4 publication Critical patent/EP1278953A4/fr
Application granted granted Critical
Publication of EP1278953B1 publication Critical patent/EP1278953B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F02M26/59—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor
    • F02M26/60—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor in response to air intake 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
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/38—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with two or more EGR valves disposed in parallel
    • 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
    • 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
    • F02M26/58—Constructional details of the actuator; Mounting thereof
    • 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
    • F02M26/66—Lift valves, e.g. poppet valves
    • F02M26/69—Lift valves, e.g. poppet valves having two or more valve-closing members

Definitions

  • the present invention relates generally to an exhaust gas recirculation (EGR) system for regulating the flow of an exhaust gas.
  • EGR exhaust gas recirculation
  • EGR systems are increasingly being utilized to improve the efficiency of engines and reduce the harmful effects of the exhaust gas on the environment.
  • an engine burns fuel, it produces an exhaust gas which contains unburned fuel and other impurities, h an EGR system, the exhaust gas is redirected through the engine to burn any unburned fuel remaining in the exhaust gas. Reburrring the exhaust gas before it is released reduces the harmful effects of the exhaust gas on the atmosphere and enables the vehicle to meet government emission standards.
  • EGR systems typically include a valve and a cooler. The valve regulates the amount of exhaust gas that is introduced back into the engine. The cooler cools the exhaust gas to a specified temperature which condenses the unburned fuel.
  • Prior EGR systems utilize a vacuum source with a diaphragm actuator to open and close the valve.
  • the diaphragm actuator has a slow response time and is either open or closed with no intermediate valve position.
  • One drawback to the prior art is that the slow response time of valves reduce the horsepower and efficiency of the engine, limiting the amount the EGR system may be used.
  • the present invention relates to an exhaust gas recirculation system for regulating the flow of an exhaust gas.
  • the exhaust gas recirculation system includes an EGR valve apparatus which regulates the amount of exhaust gas that is recirculated in the system, hi one embodiment, a motor rotates a shaft which opens or closes a plurahty of valves. The amount of exhaust gas flowing through the EGR valve apparatus is proportional to the amount the valves are opened or closed.
  • a force balanced rotary EGR valve assembly including balance seat valves is utilized. When more exhaust is to enter a chamber, the shaft is rotated, moving a downward balanced seat rotary EGR valve downwardly out of the chamber against the flow of exhaust and an upward balanced seat rotary EGR valve upwardly into the chamber with the flow of exhaust. Rotating the shaft in the opposite direction reverses the movement of the valves, allowing less exhaust gas to enter the chamber.
  • a third embodiment includes an inline poppet located on each valve which opens to allow gas to enter the chamber before the EGR valve is opened to overcome the pressure in the system.
  • a cam translates the rotary motion of the motor shaft to the linear motion of a valve shaft to open the EGR valve.
  • the motor rotates the motor shaft to pivot a balance arm in a fourth embodiment.
  • a first end of the arm moves upwardly to raise an EGR valve, and a second end of the arm moves downwardly to lower an EGR valve, allowing more exhaust gas to enter the chamber.
  • Reverse rotation of the shaft reverses the movement of the valves, allowing less exhaust gas to enter the chamber.
  • an air venturi apparatus is employed.
  • the motor rotates a shaft of a poppet, separating a pintle from an orifice.
  • the degree of separation of the pintle from the orifice allows a proportional amount of a fresh air/exhaust gas mixture to return to the system.
  • the present invention provides an exhaust gas recirculation system for regulating the flow of an exhaust gas.
  • Figure 1 illustrates a flow diagram for an exhaust recirculation system which regulates the, flow of an exhaust gas
  • Figure 2 is a perspective view of a first embodiment of the valve apparatus of the present invention
  • Figure 3 illustrates a perspective view of a second embodiment of the valve apparatus employing a forced balanced seat EGR valve assembly
  • Figure 4 illustrates a cross sectional side view of the valves of the force balanced rotary EGR valve assembly of the second embodiment
  • Figure 5 illustrates an interior cross sectional view of a third embodiment of the valve apparatus with the force balanced rotary valves opened
  • Figure 6 illustrates an interior cross sectional view of a fourth embodiment of the valve apparatus.
  • Figure 7 illustrates a perspective internal view of an air venturi assembly of a fifth embodiment of the present invention.
  • the exhaust gas recirculation (EGR) system illustrated in Figure 1, comprises an engine control unit (ECU) 10 which transmits a pulse width modulated (PWM) signal 20 to a printed circuit board (PCB) pilot circuit 12.
  • PWM pulse width modulated
  • PCB printed circuit board
  • a PWM signal 20 is not strong enough to operate a motor 14, the pilot circuit 12 is connected to a second current source 18, such as a battery, which increases the strength of the PWM signal 20.
  • the pilot circuit 12 then transmits a second signal 22 to the motor 14, which actuates a valve apparatus 16 to control the flow of a fresh air/exhaust gas mixture back into the system.
  • the motor 14 is an electric D/C motor 14, preferably a monophase electromagnetic actuator.
  • the ECU 10 is programmed to operate the EGR system at certain customer specified duty cycles. As a vehicle travels at a constant speed, the ECU 10 transmits a signal to operate the EGR system at full capacity. However, when the vehicle requires maximum horsepower, such as during acceleration, the ECU 10 transmits the PWM signal 20 to close the valves apparatus 16, to step exhaust gas recirculation. The ECU 10 is limited by being able to transmit a signal of no more than 1.3 amps.
  • Figure 2 illustrates a first embodiment of the EGR valve apparatus 16 of the present invention.
  • a non-contact sensor of the motor 14 receives a signal from the pilot circuit 12 and in response rotates a shaft 30 to proportionally open or close a plurality of valves 28.
  • the motor 14 is attached to a housing 42 by a bracket 34, which provides support for the shaft 30 and withstands the torque produced as the shaft 30 rotates.
  • Each of the valves 28 includes an arm 44 connected to a disc 46 by a pin. As the shaft 30 rotates, the arm 44 pivots and the disc 46 moves, opening and closing the valves 28. hi this embodiment, each of the valves 28 are substantially positioned on the same side of the shaft 30.
  • exhaust gas flows from the engine, which is fastened to the housing 42 at a first mounting face 24, through an exhaust gas inlet 40.
  • the exhaust gas enters a chamber 36 and exits the valve assembly 16 through the outlet 38.
  • the exhaust gas then flows into a cooler, which is fastened to the housing 42 at a second mounting face 26.
  • a valve assembly 116 including force balanced seat rotary EGR valves 128 is utilized.
  • the shaft 130 rotates to proportionally raise and lower the rotary EGR valves 128 allowing exhaust to enter the chamber 136 from the engine.
  • a pair of force balanced rotary EGR valves 128 are illustrated, any number may be utilized, hi this embodiment, the rotary EGR valves 128 are positioned on opposite sides of the shaft 130.
  • each rotary EGR valve 128 includes a pintle 148 attached to a bottom portion 150 of a valve shaft 144.
  • the shaft 130 is rotated so that the downward rotary EGR valve 128a moves downwardly out of the chamber 126 against the flow of exhaust, and the upward rotary EGR valve 128b moves upwardly into the chamber 136 with the flow of exhaust.
  • the degree of rotation of the shaft 130 determines the amount the rotary EGR valves 128a, 128b are opened. It is preferred that the shaft 130 be rotated 20°, although other degrees of rotation are possible depending on system requirements.
  • the shaft 130 When less exhaust is to enter the system, the shaft 130 is rotated in the opposite direction, reversing the abovementioned movement of the valves 128a, 128b.
  • the pintles 148 of the rotary EGR valves 128 fit securely into an orifice 146 cut into the first mounting face 124 of the housing 142, preventing exhaust from being recirculated into the system.
  • each valve shaft 152 As further illustrated in Figure 4, an upper portion 152 of each valve shaft
  • valve shaft 144 secures the assembly.
  • the arms 154 pivot and transfer the rotational movement of the shaft 130 into the linear movement of the rotary EGR valves 128a, 128b.
  • a spring can be employed on the motor shaft 130 proximate to the motor 114 to prevent vibrations and to act as a fail safe mechanism to close the valves 128a, 128b if the motor 114 loses power.
  • Figure 5 illustrates a third embodiment of the EGR valve assembly 216 in an open position.
  • An inline poppet 266 located on the pintle 248 opens to allow gas to enter the chamber 236 before the EGR valve 228 is opened. This overcomes the pressure in the system, reducing the force needed to open the EGR valve 228.
  • the motor 214 rotates a shaft 230 which is connected to a cam 268, the cam 268 translating the rotary motion of the motor shaft 230 to the linear motion of the valve shaft 244 and opens the EGR valve 228.
  • the degree of rotation of the motor shaft 230 determines the degree of the opening of the EGR valve 228. Rotation of the motor shaft 230 moves the pintle 248 towards or away from the orifice 246 to allow the desired amount of exhaust gas to enter the chamber 236.
  • Fig. 6 illustrates a fourth embodiment of valve assembly 316.
  • the motor 314 rotates a motor shaft 330, pivoting a balance arm 372 so that a first end 374b of the arm 372 moves upwardly to raise the rotary EGR valve 328b, and the second end 374a of the arm 372 moves downwardly to lower the rotary EGR valve 328a.
  • Reverse rotation of the shaft 330 reverses the movement of the valves 328a, 328b.
  • the degree of the opening of the valves 328a, 328b is determined by the ECU 10.
  • FIG. 7 illustrates an air venturi valve apparatus 416.
  • Fresh air enters from a fresh air inlet 432 in a first elongated tube 424 and exhaust gas enters from an exhaust gas inlet, mixing in a chamber 436 of a housing 442.
  • the fresh air/exhaust gas mixture exits the housing 442 through a fresh air/exhaust gas mixture outlet 438 in a second elongated tube 426, leading back to the system.
  • the motor 414 rotates a shaft 444 of a poppet 430 threaded in the first elongated tube 424, separating a pintle 448 from an orifice 446.
  • the pintle 448 moves away, the fresh air/exhaust gas mixture passes through the orifice 446 and into the system.
  • the pintle 448 of the poppet 430 can be repositioned depending on the system requirements.
  • the valve shaft 444 is rotated such that the pintle 448 is secured in the orifice 446, blocking the flow of fresh air/exhaust gas into the second elongated tube 426 and into the system.
  • the motor 14 can proportionally open the valves 28, allowing for various flow ranges. Secondly, the motor 14 achieves a faster response than the vacuum actuators of the prior art. Additionally, this EGR system reduces space requirements within the engine compartment due to the compact size of the motor 14.

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)

Abstract

Cet appareil de soupape de recirculation des gaz d'échappement (RGE) (16) régule la quantité de gaz d'échappement recirculé dans un système RGE. Les soupapes RGE (28) sont ouvertes ou fermées par un arbre rotatif (30) activé par un moteur (14). Dans un mode de réalisation différent, ces soupapes peuvent être équilibrées sur l'arbre, les soupapes se déplaçant dans des directions opposées pendant la rotation. Un champignon incorporé peut être utilisé pour vaincre la pression dans le système avant la mise en mouvement des soupapes. Dans un mode de réalisation différent, le moteur fait tourner l'arbre fileté afin de déplacer un pivot en direction d'un orifice et loin de ce dernier.
EP01932903A 2000-05-03 2001-05-03 Appareil de soupape rge Expired - Lifetime EP1278953B1 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
US20199100P 2000-05-03 2000-05-03
US202931P 2000-05-09
US23443200P 2000-09-21 2000-09-21
US234432P 2000-09-21
US23582800P 2000-09-27 2000-09-27
US235828P 2000-09-27
PCT/US2001/014200 WO2001083975A1 (fr) 2000-05-03 2001-05-03 Appareil de soupape rge

Publications (3)

Publication Number Publication Date
EP1278953A1 true EP1278953A1 (fr) 2003-01-29
EP1278953A4 EP1278953A4 (fr) 2004-10-27
EP1278953B1 EP1278953B1 (fr) 2009-11-11

Family

ID=41319399

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01932903A Expired - Lifetime EP1278953B1 (fr) 2000-05-03 2001-05-03 Appareil de soupape rge

Country Status (1)

Country Link
EP (1) EP1278953B1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB126389A (en) * 1917-01-29 1919-05-15 Sunbeam Motor Car Co Ltd Improvements in Valve-Operating Mechanism for Internal Combustion Engines.
GB149622A (en) * 1918-05-14 1921-12-28 Oesterr Daimler Motoren Ag Improvements in valve gear for internal combustion engines
EP0887540A2 (fr) * 1997-06-24 1998-12-30 Eaton Corporation Soupape de recirculation de gaz d'échappement
US6041764A (en) * 1997-06-23 2000-03-28 Honda Giken Kogyo Kabushiki Kaisha Exhaust circulation control valve for automotive engines

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5650251A (en) * 1979-10-02 1981-05-07 Kanesaka Gijutsu Kenkyusho:Kk Egr system for engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB126389A (en) * 1917-01-29 1919-05-15 Sunbeam Motor Car Co Ltd Improvements in Valve-Operating Mechanism for Internal Combustion Engines.
GB149622A (en) * 1918-05-14 1921-12-28 Oesterr Daimler Motoren Ag Improvements in valve gear for internal combustion engines
US6041764A (en) * 1997-06-23 2000-03-28 Honda Giken Kogyo Kabushiki Kaisha Exhaust circulation control valve for automotive engines
EP0887540A2 (fr) * 1997-06-24 1998-12-30 Eaton Corporation Soupape de recirculation de gaz d'échappement

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 005, no. 108 (M-078), 14 July 1981 (1981-07-14) & JP 56 050251 A (KANESAKA GIJUTSU KENKYUSHO:KK), 7 May 1981 (1981-05-07) *
See also references of WO0183975A1 *
VANORMELINGEN H ET AL: "EXHAUST GAS RECIRCULATION VALVE FOR AN ENGINE" RESEARCH DISCLOSURE, KENNETH MASON PUBLICATIONS, HAMPSHIRE, GB, no. 441, January 2001 (2001-01), page 109, XP001128022 ISSN: 0374-4353 *

Also Published As

Publication number Publication date
EP1278953B1 (fr) 2009-11-11
EP1278953A4 (fr) 2004-10-27

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