EP3423740A1 - Valve device for an internal combustion engine - Google Patents
Valve device for an internal combustion engineInfo
- Publication number
- EP3423740A1 EP3423740A1 EP17706762.6A EP17706762A EP3423740A1 EP 3423740 A1 EP3423740 A1 EP 3423740A1 EP 17706762 A EP17706762 A EP 17706762A EP 3423740 A1 EP3423740 A1 EP 3423740A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- internal combustion
- diaphragm
- combustion engine
- engine according
- 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- Withdrawn
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
- F02M23/00—Apparatus for adding secondary air to fuel-air mixture
- F02M23/006—Valves specially shaped for supplying secondary air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/22—Control of additional air supply only, e.g. using by-passes or variable air pump drives
- F01N3/227—Control of additional air supply only, e.g. using by-passes or variable air pump drives using pneumatically operated valves, e.g. membrane 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
- F02M23/00—Apparatus for adding secondary air to fuel-air mixture
- F02M23/04—Apparatus for adding secondary air to fuel-air mixture with automatic control
- F02M23/08—Apparatus for adding secondary air to fuel-air mixture with automatic control dependent on pressure in main combustion-air induction system, e.g. pneumatic-type apparatus
- F02M23/09—Apparatus for adding secondary air to fuel-air mixture with automatic control dependent on pressure in main combustion-air induction system, e.g. pneumatic-type apparatus using valves directly opened by low 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
- F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities
-
- 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
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K29/00—Arrangements for movement of valve members other than for opening and closing the valve, e.g. for grinding-in, for preventing sticking
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/126—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like
- F16K31/1268—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like with a plurality of the diaphragms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2270/00—Mixing air with exhaust gases
- F01N2270/10—Mixing air with exhaust gases for rendering exhaust innocuous, e.g. by dilution
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the invention relates to a valve device for an internal combustion engine having a pneumatically actuated actuator with a first diaphragm, a housing having an inlet and an outlet, a valve rod which is movable via the actuator, a valve closing member which is attached to the valve rod and which is mounted on a a check plate, which is loaded via a spring force in the direction of a second valve seat, a flow cross-section between the inlet and the outlet, which is releasable or closable by the valve closure member and the check plate, and a pneumatically actuated Distance element, via which the check plate is lifted against the spring force from the second valve seat when resting on the first valve seat valve closing member.
- valve devices are used in particular in the secondary air injection into the exhaust tract of an internal combustion engine to reduce pollutants, which can be released or shut off via the valve closing member of a secondary air pump Asked secondary air flow, while the check valve prevents backflow of exhaust gas from the exhaust area to the secondary air pump at occurring Abgaspulsationen ,
- a turn-off check valve is proposed in DE 10 2006 021 467 AI, which has a spacer element through which the check plate is easily lifted from the valve seat when the valve closure member is in the closed state.
- the spacer element is connected to a shape changing element, by which the spacer element is movable in the direction of the check plate or removable from this.
- a control chamber which is acted upon to actuate the closing member with a negative pressure, connected to a bellows whose length is chosen such that it rests in its normal position against the check plate and this lifts off from the seat.
- the bellows Upon application of a negative pressure in the control chamber, the bellows is contracted, so that the check plate can take over their normal function. Accordingly, either additional actuators are to be used or there are other connections that can lead to leaks.
- the problem with this embodiment is also that the storage area of the valve stem is not reliably sealed, so that condensates begin in the sliding bush between the valve stem and the slide bushing and freeze there, which again the function of the valve is limited.
- the spacer element is connected to a second diaphragm, which limits a control chamber of the pneumatic actuator on one side, is separated by this membrane, the actuator chamber to the flow housing sealing.
- the actuation takes place directly via a pressure difference, which is required for the actuation of the valve closure member. Gluing the check plate to the valve seat in the closed position, for example by ice formation is reliably avoided.
- the spacer element has at least one arm, which is movable against the check plate, so that only a slight influence of the air flow takes place when the valve is open.
- the spacer elements can be distributed uniformly over the circumference.
- control chamber is bounded on its opposite side by the first diaphragm which is connected to the valve rod, so that the two diaphragms are deformed in opposite directions, whereby in a simple manner with only one control chamber the opposite movements of the first and second membrane and thus the valve closure member and the check plate can be realized.
- the second membrane is clamped on its inner circumference and on its outer circumference between the housing and a fastening element, whereby a tight connection of the membrane is produced without additional components.
- the membrane serves as a fastening element on the outer circumference of the membrane a pressed-in an annular projection of the housing mounting ring. Accordingly, the membrane is circumferentially fixed at its outer periphery with only one assembly step.
- a widening collar of a sliding bush serves as a fastening element on the inner circumference of the membrane, via which the valve rod is mounted. This attachment is done in only one assembly step. Additional components are not needed. Furthermore, leaks over the gap between the sliding bush and the housing are reliably avoided.
- a third membrane is attached to the valve rod on the side opposite to the second membrane side of the slide bushing.
- the gap between the valve rod and the slide bushing can be sealed so that it is completely sealed, whereby the life of the valve is further increased. Furthermore, the penetration of condensates or dirt particles is reliably prevented in this area, so that a seizing is prevented, for example by ice formation in this gap.
- the third membrane is preferably on its inner circumference on the valve rod between the sliding bush and the valve closing member attached and clamped its outer periphery between a valve seats forming the valve plate and extending in the direction of the valve plate annular projection of the housing. Accordingly, a space between the second and third membrane and the housing is completely shut off.
- a first spring exerts a force on the first diaphragm, through which the valve closing member is loaded in the closing direction. Accordingly, the valve is closed in its normal position, whereby only a negative pressure for actuation must be initiated.
- the closing force can be adjusted to a desired force.
- a second spring exerts a force on the second membrane, through which the spacer is loaded in the direction of the check plate. This means that here is the normal position of the spacer element, the one in which the check plate is lifted by the spacer element. This ensures that the check plate does not rest on its seat when the engine is switched off. The opening force can thus be adjusted by the two springs.
- the check plate in the resting on the first valve seat state of the valve closing member is radially surrounded by the valve closing member and is loaded by a biased between the valve closing member and the check plate spring element in the direction of the second valve seat, which is formed radially within the first valve seat. So on the one hand the check plate is protected and on the other hand, no other components are required to ensure the function of a check valve.
- the spring force of the second spring is greater than the spring force of the spring element, so that a safe lifting of the check plate is ensured in the closed state.
- valve device for an internal combustion engine which is insensitive to contamination, condensates or ice formation and its operation is already available immediately after the start of the internal combustion engine regardless of the ambient temperatures, since a clamping of the check plate is reliably prevented. Furthermore, this valve has a long service life, as mutually sliding parts are reliably sealed.
- valve device An embodiment of a valve device according to the invention is shown in the figures and will be described below.
- Figure 1 shows a side view of a valve device according to the invention in a sectional view.
- FIG. 2 shows a perspective view of the spacer element with membrane from FIG. 1.
- the valve device consists of a pneumatically actuated actuator 10 with a control chamber 12, in which a negative pressure via a connecting piece 14, for example, from a vacuum pump can be initiated, which acts on a first diaphragm 16, which by the negative pressure against a spring force of a first spring 18th is deformed.
- the actuator 10 is bounded by a housing 20, which also has a bearing surface for the first spring 18 and at the same time forms a flow housing of the valve device, which has an inlet 22 and an outlet 24.
- Actuator side, the housing 20 is closed by a cover 26, wherein between the lid 26 and an annular edge 28 of the housing 20, the first diaphragm 16 is clamped on its outer periphery.
- the inner circumference of the membrane 16 is molded onto a valve stem support 30, to which a valve rod 32 is attached and which serves as a second bearing surface for the opposite end of the first spring 18, via which the valve rod 32 is loaded in the direction of the lid 26.
- valve closure member 34 is attached which cooperates with a first valve seat 36 formed on a valve plate 38 which is secured in the housing 20 and has flow cross-sections 40 through which the inlet 22 communicates with the outlet 24 is connected by lifting the valve closure member 34 from the valve seat 36.
- valve seat 42 On the valve plate 38, a second, concentrically arranged within the first valve seat 36 valve seat 42 is additionally formed, which corresponds to a non-return valve acting as a check plate 44, which is loaded via a spring element 46 in the direction of the second valve seat 42 and mounted on the valve rod 32 ,
- This spring element 46 is supported with its opposite axial end on the valve closure member 34 and is radially as well as the check plate 44 in the flow cross-section 40 occlusive state of the valve closure member 34 surrounded by this.
- the check plate 44 is correspondingly loaded with closed valve closing body and thus in the normal position of the actuator 10, in which no vacuum in the control chamber 12, by the spring element 46 against the second valve seat 42. Since this is particularly the case when the valve is in the off state of the internal combustion engine, can be caused by contamination from the exhaust gas or by freezing liquids adhesions between the second valve seat and the check plate, the correct Prevent the functioning of the check valve during a subsequent start of the internal combustion engine.
- a pneumatically actuated spacer element 48 is additionally mounted in the housing 20, the axial end abuts against the check plate 44 with the valve switched off or when the valve closing member 34 is closed and these removed from the second valve seat 42, so that a gap 50 between the second valve seat 42 and the check plate 44 is formed.
- the spacer element 48 consists of an annular support element 52, from which two arms 54 extend opposite one another in the direction of the check plate 44. For example, three or more arms 54 could also be formed, which are usually distributed evenly around the circumference.
- the annular support member 52 is secured to a second diaphragm 56 which bounds the control chamber 12 in the direction of the valve closure member 34 radially inwardly of the first spring 18.
- This second diaphragm 56 is axially clamped at its outer periphery between a support surface 58 of the housing 20 and a fastener which is formed as a fixing ring 60, which in a corresponding extending into the control chamber 12 annular projection 62 of the housing 20, which of the first spring 18 is surrounded, is pressed.
- the second diaphragm 56 is axially between an axial end of an inner housing portion 64, in which a receiving bore 66 is formed, in which a sliding bushing 68 is arranged for slidably receiving the valve rod 32, and a radially outwardly projecting collar 70 of this sliding bushing 68, which serves as a fastener, clamped.
- a second spring 72 is arranged, which is supported on the one hand on the second diaphragm 56 and the support member 52 and abuts against the valve rod support 30 on the opposite side.
- This second spring 72 has a greater spring force than that on the Check plate acting spring element, thereby ensuring that upon actuation of the second diaphragm 56 by the second spring 72, the check plate 44 is lifted from the valve seat 42 and is not pressed onto this.
- the valve rod 32 is correspondingly moved on the one hand such that the valve closing member 34 is lifted from the first valve seat 36 and on the other hand pulled the spacer 48 in the opposite direction, whereby the check plate 44 by the spring member 46 on the valve seat 42nd is pressed and abuts against this, as long as the air pressure produced by the conveyed air flow does not exert a force on the check plate 44, which exceeds the force of the spring element 46.
- the arrangement of the second diaphragm 56 at the same time ensures that no gas or contaminants can penetrate into the control chamber 12 except along the valve rod 32 between the latter and the slide bushing 68.
- an annular projection extends from the inner housing portion 64 74 in the direction of the valve plate 38, which ends just before the valve plate 38 and between the end and the valve plate 38, the outer periphery of a third diaphragm 76 is clamped, whose inner periphery is sealingly secured to the valve rod 32. Accordingly, the guide portion of the valve rod 32 is completely sealed by the second diaphragm 56 and the third diaphragm 76.
- a vacuum is drawn in the control chamber 12.
- the first diaphragm 16 and the second diaphragm 56 are deflected to each other, so that the valve closing member 34 is lifted from the first valve seat 36 and the spacer 48 is removed from the check plate 44.
- the check plate 44 assumes its normal function as a check valve and air can flow from the inlet 22 to the outlet 24, while the reverse path through the check plate 44 is locked. If no more air to be conveyed or the engine is issued below, air enters the control chamber 12, so that the spring forces determine the position of the valve rod 32 and the spacer 48.
- valve closing member 34 is moved against its valve seat 36 and closes it and the spacer 48 is pressed against the check plate 44 and removes it from the valve seat 42.
- the exhaust gases present at the outlet 24 and the pollutants present in the exhaust gas as well as resulting condensates can not accumulate in the abutment region of the check plate 44 on the second valve seat 42 and lead to jamming of the check plate 44, for example due to ice formation.
- these exhaust gases or condensates from the air reach the area of the valve stem guide, since this space is completely sealed by the third membrane 76. It follows that the correct operation of the valve device according to the invention is guaranteed regardless of existing contaminants and temperatures from the start. This also increases the life of such a valve.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Toxicology (AREA)
- Fluid-Driven Valves (AREA)
- Check Valves (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016103549.1A DE102016103549B3 (en) | 2016-02-29 | 2016-02-29 | Valve device for an internal combustion engine |
PCT/EP2017/054056 WO2017148769A1 (en) | 2016-02-29 | 2017-02-22 | Valve device for an internal combustion engine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3423740A1 true EP3423740A1 (en) | 2019-01-09 |
Family
ID=58011475
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17706762.6A Withdrawn EP3423740A1 (en) | 2016-02-29 | 2017-02-22 | Valve device for an internal combustion engine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3423740A1 (en) |
DE (1) | DE102016103549B3 (en) |
WO (1) | WO2017148769A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019116509B4 (en) | 2019-06-18 | 2023-05-04 | Pierburg Gmbh | Valve device for an internal combustion engine |
EP3990761B1 (en) | 2019-06-26 | 2023-05-31 | Pierburg GmbH | Valve device for an internal combustion engine |
DE102020118063A1 (en) | 2020-07-08 | 2022-01-13 | Pierburg Gmbh | Valve device for an internal combustion engine |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10225161A1 (en) * | 2002-06-06 | 2003-12-18 | Pierburg Gmbh | valve device |
DE10312925B3 (en) * | 2003-03-22 | 2004-11-04 | Pierburg Gmbh | Secondary air valve device |
DE102006021467A1 (en) * | 2006-05-09 | 2007-11-22 | Pierburg Gmbh | Motor vehicle valve e.g. non-return valve, has valve seat arranged between inlet and outlet, and distance unit that lies against valve body in closed position in order to maintain valve body in distance to valve seat |
DE102007031957A1 (en) * | 2007-07-10 | 2009-01-22 | Pierburg Gmbh | Combined non-return and control valve |
DE102013215417B4 (en) * | 2013-08-06 | 2023-07-27 | Volkswagen Aktiengesellschaft | Secondary air injection system for an internal combustion engine |
US9537161B2 (en) * | 2013-10-11 | 2017-01-03 | GM Global Technology Operations LLC | Freeze-tolerant valve |
JP2016008683A (en) * | 2014-06-25 | 2016-01-18 | 浜名湖電装株式会社 | Fluid control valve device |
-
2016
- 2016-02-29 DE DE102016103549.1A patent/DE102016103549B3/en active Active
-
2017
- 2017-02-22 WO PCT/EP2017/054056 patent/WO2017148769A1/en active Application Filing
- 2017-02-22 EP EP17706762.6A patent/EP3423740A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
WO2017148769A1 (en) | 2017-09-08 |
DE102016103549B3 (en) | 2017-03-02 |
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