EP3837435A1 - Spülluftpumpe und fahrzeug - Google Patents
Spülluftpumpe und fahrzeugInfo
- Publication number
- EP3837435A1 EP3837435A1 EP20767726.1A EP20767726A EP3837435A1 EP 3837435 A1 EP3837435 A1 EP 3837435A1 EP 20767726 A EP20767726 A EP 20767726A EP 3837435 A1 EP3837435 A1 EP 3837435A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- spring
- vehicle
- air pump
- pump stage
- 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- Withdrawn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
- 238000010926 purge Methods 0.000 title claims abstract description 23
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 11
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 10
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 10
- 239000002828 fuel tank Substances 0.000 claims abstract description 8
- 239000004033 plastic Substances 0.000 claims description 18
- 229920003023 plastic Polymers 0.000 claims description 18
- 230000002000 scavenging effect Effects 0.000 claims description 14
- 230000008929 regeneration Effects 0.000 claims description 6
- 238000011069 regeneration method Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 230000001172 regenerating effect Effects 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 28
- 239000000446 fuel Substances 0.000 description 7
- 238000003475 lamination Methods 0.000 description 5
- 239000003502 gasoline Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 239000002041 carbon nanotube Substances 0.000 description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000009795 derivation Methods 0.000 description 2
- 230000005670 electromagnetic radiation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000002482 conductive additive Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010943 off-gassing Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
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
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/068—Mechanical details of the pump control unit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/40—Structural association with grounding devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/40—Organic materials
- F05D2300/43—Synthetic polymers, e.g. plastics; Rubber
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2211/00—Specific aspects not provided for in the other groups of this subclass relating to measuring or protective devices or electric components
- H02K2211/03—Machines characterised by circuit boards, e.g. pcb
Definitions
- the invention relates to a scavenging air pump for regenerating a restraint system for hydrocarbon emissions from a fuel tank of a vehicle and to a vehicle with such a scavenging air pump.
- a so-called restraint system has long been required in vehicles with gasoline engines in order to capture fuel vapor or gas emissions from the fuel tank and thus comply with the legally stipulated emission limit values for evaporation losses.
- Such a restraint system comprises a fuel or hydrocarbon emission storage device in the form of an activated charcoal container, into which a vent line of a fuel tank opens, as well as a regeneration valve, also called a tank vent valve, which is connected to both the activated charcoal canister and a gasoline engine via a line .
- the activated carbon which acts as a storage medium, absorbs the hydrocarbon emissions and only allows air to escape into the open.
- a vacuum pump also called a scavenging air pump, is used between the activated charcoal canister and the internal combustion engine to get fresh air from the
- the fresh air absorbs the hydrocarbon emissions absorbed by the activated carbon and feeds them to the engine's combustion.
- An engine control unit controls the regeneration valve and thus the amount of regeneration gas depending on an engine operating point.
- the activated charcoal canister In order for the activated charcoal canister with its limited storage capacity to remain receptive to newly evaporating or outgassing fuel, the activated charcoal canister must be rinsed in the meantime are repeatedly initiated by the engine control unit. Otherwise, after the activated carbon is completely saturated, fuel vapor would get into the environment.
- said scavenging air pump comprises a large number of components made of plastic.
- these plastic components tend to be electrostatically charged due to friction between the hydrocarbon-enriched air sucked in on the pump inlet side or pumped out on the pump outlet side (or the aerosols of this air-hydrocarbon mixture) and the plastic components.
- One of the objects of the invention is to avoid uncontrolled electrostatic discharges in such a purge air pump.
- Embodiments of the invention are the subject of the subclaims.
- the purge air pump for the regeneration of a restraint system for hydrocarbon emissions of a fuel tank of a vehicle.
- the purge air pump comprises a pump stage and an electric motor driving the pump stage, the stator of which is electrically connected to a housing of the pump stage in order to divert electrostatic charges from the pump stage to the stator, which is connected as such to a vehicle ground.
- the spring - which as such can be made of metal or an electrically conductive plastic - electrically conductive with respect to the pump stage housing and the stator and preferably directly or directly supported.
- the proposed spring arrangement creates a reliable electrical connection between the pump stage and the stator-side electrically conductive components of the scavenging air pump and thus contributes to avoiding uncontrolled electrostatic discharges in the vicinity of a fuel system.
- a vehicle is to be understood as any type of vehicle that has to be supplied with a liquid fuel for operation. Furthermore, the vehicle can also be a partially electric vehicle.
- Fig. 1 shows a proposed active, electric scavenging air pump in a
- FIG. 2 the scavenging air pump shown in FIG. 1 in an exploded view
- FIG. 3 shows the scavenging air pump shown in FIG. 1 in a sectional illustration.
- the proposed active electrical purge air pump 2 - also called Active Purge Pump, for short: APP - comprises a pump stage 4 and a brushless electric motor 6 designed as an internal rotor and which drives the pump stage 4. Air enriched with hydrogen from an activated carbon filter and conveys it to an Otto engine via an outlet A.
- the purge air pump 2 is designed, for example, as a radial pump - also called a centrifugal pump - in which the
- the conveying medium emerges radially, i.e. perpendicular to a pump shaft 13, from an impeller 28.
- the electric motor 6 comprises a stator lamination stack 8 on the stator side, which with z. B. three bobbins 10 is joined.
- the stator also includes a printed circuit board 14 which - arranged parallel to the stator lamination stack 8 - via several press-in or plug-in contacts (not visible here) with the stator lamination stack 8, namely in
- weld contacts can also be provided.
- connection pins 16 lead away from the circuit board 14, one of which - and this is the ground pin (GND pin for short) - is connected to the vehicle ground when the scavenging air pump 2 is in operation.
- the stator further comprises an overmolded plastic housing 24 (see. Fig. 3), which said
- connection pins 16 are enclosed by a connection socket AB which, as such, is molded onto the plastic housing 24 (cf. FIG. 3).
- a rotor 12 with magnets is arranged on the inside of the laminated stator core 8 and the coil bobbins 10 on a rotor shaft 13, which as such drives the pump stage 4.
- the pump stage 4 comprises a housing with a pump stage flange 26 made of plastic and a pump stage cover 18 made of plastic, which
- a radial pump impeller 28 which, for example, can also be made of plastic and is joined to the rotor shaft 13, wherein the rotor shaft 13 can also be made of a plastic.
- the pump step flange 26 is inserted into a spiral housing 20 made of plastic, on which a connector forming the outlet A for connection to a line to the said gasoline engine is molded (cf. FIG. 2 in conjunction with FIG. 3).
- a den the connector forming the inlet E is molded onto the pump stage flange 26 for connection to a line to said activated carbon filter (cf. FIG. 3).
- a metallic compression spring 22 for example in the form of a spiral spring, is arranged between the pump stage cover 18 and the stator lamination stack 8, the spiral spring 22 being electrically conductive with respect to the pump stage cover 18 and the stator lamination stack 8 and, for example, directly or directly supported.
- an electrically conductive plastic spring can also be provided.
- any insulating layer that may be present on the laminated stator core 8 must be removed in the area of the support surface of the spiral spring 22.
- the spiral spring 22 can be guided inside by means of a pin (not shown here) that extends through the spiral spring 22, and / or outside by means of a sleeve (not shown here) that surrounds the spiral spring 22 in order to prevent the spiral spring from buckling 22 to prevent.
- a leaf spring functioning as a compression spring - not shown here - can be provided instead of the previously mentioned spiral spring 22 .
- This can be a separate leaf spring or, alternatively, a part of a sheet metal layer adjacent to the pump stage cover 18
- the sheet metal part is reshaped accordingly and acts as such as a compression spring.
- an additional component and an additional contact point are advantageously omitted.
- the plastics from which the individual plastic components of the purge air pump are made can in principle be designed to be electrically conductive or non-conductive.
- Electrically conductive plastics contain electrically conductive additives such as soot, carbon fibers, carbon nanotubes (so-called carbon nanotubes, or CNT for short), metal fibers, etc. in order to achieve a surface resistance of ⁇ 10 9 ohms.
- Such plastics must be really safe to a Vehicle ground are connected, because they represent as such a type of electrode that has a capacity compared to the vehicle ground.
- a charging of the rotor 12, which is metallic as such, via an electrically conductive rotor shaft 13, is a
- the proposed spring arrangement produces a reliable electrical
- the proposed spring arrangement thus contributes to avoiding uncontrolled electrostatic discharges in the vicinity of a fuel system.
- the proposed spring arrangement also compensates for manufacturing-related dimensional tolerances and thermally related expansions.
- the derivation function of the spring arrangement is also ensured in the absence of a possible error in relation to the spring itself.
- a significant charge can only occur during operation, i.e. with a plug plugged into the connection socket AB, which ensures the connection to the vehicle reference potential.
- the derivation function can also be easily checked in production by selecting a first measuring point through inlet E of the purge air pump 2 on the rotor shaft 13 and a second measuring point on the ground pin 16. The entire critical current path is checked. Furthermore, in the proposed spring arrangement, the electric motor stator and the pump stage 4 act as parts of a Fahraday cage, which as such significantly dampens electromagnetic radiation from the purge air pump 2, from which other electronic components - such as a radio receiver - in the vicinity of the purge air pump 2 benefit.
- a resistor can be placed in the current path from the stator to the ground pin 16 in order to limit the maximum current in the event of a fault.
- the dissipation function is also ensured at e.g. 100 kOhm.
- this resistance can be bridged with a capacitor of e.g. 100 nF. The capacitor blocks a direct voltage, but represents a negligible resistance for a floch frequency.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019211530.6A DE102019211530A1 (de) | 2019-08-01 | 2019-08-01 | Spülluftpumpe und Fahrzeug |
| PCT/EP2020/070551 WO2021018669A1 (de) | 2019-08-01 | 2020-07-21 | Spülluftpumpe und fahrzeug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3837435A1 true EP3837435A1 (de) | 2021-06-23 |
Family
ID=72381044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20767726.1A Withdrawn EP3837435A1 (de) | 2019-08-01 | 2020-07-21 | Spülluftpumpe und fahrzeug |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3837435A1 (de) |
| DE (1) | DE102019211530A1 (de) |
| WO (1) | WO2021018669A1 (de) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE20021796U1 (de) * | 2000-12-22 | 2002-05-02 | Ebm Werke Gmbh & Co Kg | Elektromotor, insbesondere Außenläufermotor, und Gebläse mit einem solchen Elektromotor |
| US20150354563A1 (en) * | 2013-01-15 | 2015-12-10 | Mikuni Corporation | Pump device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014222241B3 (de) * | 2014-10-30 | 2016-03-31 | Continental Automotive Gmbh | Elektrisch angetriebene Pumpe |
| CN108350883B (zh) * | 2015-11-16 | 2020-12-08 | 皮尔伯格泵技术有限责任公司 | 汽车蒸汽泵 |
| US11319966B2 (en) * | 2016-08-15 | 2022-05-03 | Pierburg Pump Technology Gmbh | Motor vehicle auxiliary power unit vacuum pump |
| EP3477829B1 (de) * | 2017-10-24 | 2023-08-02 | ZKW Group GmbH | Radiallüfter mit einem aussenläufermotor |
-
2019
- 2019-08-01 DE DE102019211530.6A patent/DE102019211530A1/de not_active Ceased
-
2020
- 2020-07-21 WO PCT/EP2020/070551 patent/WO2021018669A1/de not_active Ceased
- 2020-07-21 EP EP20767726.1A patent/EP3837435A1/de not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE20021796U1 (de) * | 2000-12-22 | 2002-05-02 | Ebm Werke Gmbh & Co Kg | Elektromotor, insbesondere Außenläufermotor, und Gebläse mit einem solchen Elektromotor |
| US20150354563A1 (en) * | 2013-01-15 | 2015-12-10 | Mikuni Corporation | Pump device |
Non-Patent Citations (1)
| Title |
|---|
| See also references of WO2021018669A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102019211530A1 (de) | 2021-02-04 |
| WO2021018669A1 (de) | 2021-02-04 |
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Legal Events
| Date | Code | Title | Description |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
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| 17P | Request for examination filed |
Effective date: 20210804 |
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| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: ALTMANN, ANDREAS Inventor name: GMELCH, MARIO Inventor name: TANG, RUNQUI Inventor name: KOEHLER, STEFAN Inventor name: WIESE, PETER |
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| RAP3 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: VITESCO TECHNOLOGIES GMBH |
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| 17Q | First examination report despatched |
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| DAV | Request for validation of the european patent (deleted) | ||
| DAX | Request for extension of the european patent (deleted) | ||
| STAA | Information on the status of an ep patent application or granted ep patent |
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| 18D | Application deemed to be withdrawn |
Effective date: 20221220 |