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
  • 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 invention relates to an electropneumatic converter, which is used for example for pneumatic control in motor vehicles by a mixing pressure is formed from the intake pressure of an internal combustion engine and the atmospheric pressure, which is a consumer, for example, a Abgasr ⁇ ckf ⁇ hrungsventil supplied.
• Such a converter is described for example in DE 41 10 003 Cl.
• This has three ports, wherein the first port is subjected to a negative pressure and the second Anschiuss to atmospheric pressure and the third port with a mixing pressure of the first and the second terminal, which is supplied to a consumer, for example, an exhaust gas recirculation valve.
• this converter has a valve device and a fixedly connected thereto plunger armature, which is displaceable by an electromagnet, so that the position of the valve device can be changed and the consumer supplied mixing pressure can be controlled.
• the valve device and the anchor connected to it are suspended in the axial direction movable on a membrane.
• a disadvantage of such a pressure transducer is that the armature and the valve device can oscillate freely in the axial direction, with undesirable vibrations being caused in particular by engine vibrations or by pressure pulsations on the part of the connected components can be. This undesirable effect occurs in conjunction with negative pressure pulsations.
• pulsations can occur in a state in which the electromagnet is not flowed through by a current and thus can not transmit any force to the plunger rod and the valve device. Unwanted vibrations of the plunger armature and the valve device lead to disturbances in the operation of the internal combustion engine.
• the object of the invention is to provide a eiektropneumatischen pressure transducer, which allows improved, trouble-free operation of the internal combustion engine.
• a damping element is provided for damping the axial movement of the armature and the valve device connected to it.
• the invention allows a reduction of pulsations in the de-energized state and in the operating range of the emaschineropneumatischen converter. Furthermore, the invention leads to a better large and small signal behavior of eiektropneumatischen converter in the ventilation process.
• the damping element may in particular be arranged between the valve device and a housing. Also, the damping element between the armature and an iron core located under the armature can be arranged. In a preferred embodiment, the damping element comprises an elastomer and may be formed in particular from elastomer.
• the damping element may be formed, for example, as a membrane or as a spring.
• the damping element has a foam, in particular polyurethane, or is in particular formed from this.
• the damping element as described above, be mounted at different locations of the electropneumatic transducer, so that a damping of the axial movement of the armature and the valve device connected to it is made possible.
• the damping element in the suspension device, through which the valve body and the armature connected to it are suspended in the axial direction movable.
• the damping element can be realized by integrated in the suspension damping legs, whereby the installation of an additional damping element is eliminated.
• the damping element can be integrated into other existing components of the electropneumatic converter, ie, these components can fulfill not only their actual function but also a damping function with respect to the axial movement of the armature and the valve device connected to it. The use of an additional damping element is not necessary in such an arrangement.
• the term integrated means in this context that the further component and the DämpfungseSement are formed einstuckig, wherein the damping element and the further component are two components which are fixedly connected to each other or it the damping element and the further component are a single component which is monolithic,
• the damping element at the acted upon by the atmospheric pressure side of the eiektropneumatischen converter.
• the closing operation of the valve device can be delayed for a short time, whereby the behavior of the eiektropneumatischen converter is improved, especially in the small signal range, the valve plate of the bellows closes the vacuum tube, which can be designed in particular as a brass tube, and the ventilation takes place on the bellows over.
• the force introduced by the damping element on the armature causes the second valve seat integrated in the armature to be closed in a delayed manner. Due to the sealing surface of the bellows, the vacuum connection (negative pressure source / pump) is kept closed as long as possible to allow ventilation.
• the damping element may be formed as a damping diaphragm and in particular as an elastomer ring, in or, in which the armature is mounted.
• FIGS. 1-6 sectional views of various embodiments of the electropneumatic converter according to the invention.
• FIGS. 1a-6a detailed views of the damping elements of the in Figs. 1-5 illustrated electropneumatic transducer.
• an electro-pneumatic converter includes a vacuum flange 10, an atmospheric pressure port 12, and a mixing pressure port 14 supplied with a mixing pressure of the vacuum port 10 and the atmospheric pressure port 12.
• the mixing pressure is supplied via the mixing pressure connection 14 to a consumer, in particular an exhaust gas recirculation valve.
• the valve device 18,28 has a Ve ⁇ tilköper 18 with a valve plate 28.
• the valve body is connected via a diaphragm 20 with a housing 32 such that it is movable in the axial direction 30.
• the membrane 20 is guided around the valve body 18 in an annular manner and is clamped in an annular recess of the housing 32 or, respectively, of a housing cover. Between the Ventii compassion 18 and the housing 32 or housing cover, the membrane 20 has a substantially arcuate course.
• the membrane 20 is also secured to the valve body 18 in a recess which annularly around the valve body 18 herumschreibt.
• an armature 16 is fixedly connected and also movable in the axial direction.
• the armature 16 comprises a magnetic material and can be moved by applying an electric current to an electromagnet 17.
• the electric coil of the electromagnet 17 is surrounded by a Eise ⁇ ummantelung 38 for bundling the magnetic field lines.
• Farther is formed between the armature 16 and the Eisenummanteiung 38, an air gap 40 in which an adjustable iron core 34 is arranged such that the length of the Lucastspatts 40 is variable.
• a second iron core 36 is provided, which projects into a recess 37 of the armature 16. Between the first iron core 34 and the armature 16, a cavity 24 is formed.
• the mixing pressure which is supplied via the mixing pressure connection 14 to a consumer, is established in a valve chamber 11, which is delimited by the membrane 20.
• the mixing pressure results from the pressure which is supplied to the electropneumatic valve via the vacuum connection and the air pressure which is supplied to the electropneumatic valve via the atmospheric pressure connection 12.
• valve plate 28 is formed integrally with the elastomeric mandrel 19 and thereby resiliently connected to the armature 16. Through the valve plate 28, the vacuum port can be opened and closed.
• the essential feature of the electropneumatic converter according to the invention is the damping element 26, which is designed according to FIG. 1 as a bellows made of elastomer, and is arranged between a valve seat collar 56 and the coil rib 27.
• the damping element 26 is formed according to FIGS. 2 and 2 a as part of the membrane 20, and can be made in one piece with this membrane 20 in an injection process. Analogous to FIGS. 1 and Ia, the effect of the damping element 26 takes place in that it is supported on one side on the coil rib 27 and on the opposite side introduces a force into the membrane 20 connected to it.
• the damping element 26 is attached to the vent side of the electropneumatic transducer, i. on the side directly connected to the atmospheric pressure port 12,
• the damping element 26 is also disposed within the cavity 22.
• an elastomeric damping element 26 is shown disposed within a cavity 24 formed between the armature 16 and the iron core 34.
• the damping element 26 is formed in the same cavity 24 as a spring.
• FIGS. 5 and 5a show at the same location a damping element made of a foam body.
• the damping element may be formed as a damping diaphragm 50 and in particular as an elastomer ring, in which or in which the armature 16 is mounted.
• the elastomeric ring preferably comprises silicone.
• the strokes of the armature 16 and the valve means 18, 28 can be damped by mounted on the housing 32 stops 44, 46, 48. These are preferably located at the location of the housing 32 to which the valve body 18 moves upon movement in the direction of the force exerted by the diaphragm 20.
• a thicker damping membrane 50 can be used, which has recesses and is thus made more flexible.
• the valve body 18 For receiving the damping diaphragm 50, the valve body 18 has a preferably annular groove 52.
• the stop 46 has a groove-shaped recess 54 through which ventilation can take place.
• the stops 46, 48 may be formed, for example, of plastic.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Magnetically Actuated Valves (AREA)
• Exhaust-Gas Circulating Devices (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38616575

Family Applications (1)

Country Status (6)

Cited By (1)

Families Citing this family (8)

Citations (11)

Family Cites Families (4)

• 2006
  • 2006-08-18 DE DE102006038920A patent/DE102006038920B4/de not_active Expired - Fee Related
• 2007
  • 2007-08-02 JP JP2009524998A patent/JP5185934B2/ja not_active Expired - Fee Related
  • 2007-08-02 EP EP07802469A patent/EP2052145B1/de not_active Not-in-force
  • 2007-08-02 US US12/377,895 patent/US8001952B2/en not_active Expired - Fee Related
  • 2007-08-02 WO PCT/EP2007/058009 patent/WO2008019949A1/de not_active Ceased
  • 2007-08-02 AT AT07802469T patent/ATE514852T1/de active

Patent Citations (11)

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