CN110312861B - Throttle element and low-pressure circuit of a fuel injection system having a throttle element - Google Patents
Throttle element and low-pressure circuit of a fuel injection system having a throttle element Download PDFInfo
- Publication number
- CN110312861B CN110312861B CN201880011874.3A CN201880011874A CN110312861B CN 110312861 B CN110312861 B CN 110312861B CN 201880011874 A CN201880011874 A CN 201880011874A CN 110312861 B CN110312861 B CN 110312861B
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- CN
- China
- Prior art keywords
- throttle
- fuel
- bore
- angle
- injection system
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- 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.)
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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
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
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- 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
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
- F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
- F02M37/44—Filters structurally associated with pumps
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- 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
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/27—Fuel-injection apparatus with filters
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/28—Details of throttles in fuel-injection apparatus
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention relates to a throttle element (1) which can be inserted into a fuel passage (2) of a low-pressure circuit of a fuel injection system, in particular of a common rail injection system, in order to throttle a fuel flow flowing through the fuel passage (2) in a main flow direction, comprising a sealing section (3) which interacts with the fuel passage (2), in the region of which a throttle bore (4) is formed, and further comprising at least one filter section (5,6) which interacts with the fuel passage (2) as an annular gap filter (14) and is separated from the sealing section (3) by an annular groove (7, 8). According to the invention, the throttle bore (4) has a profile which is inclined at an angle (α) relative to the longitudinal axis (A) of the throttle element (1), wherein the angle (α) is less than 90 °, preferably less than 60 °, further preferably less than 45 °. The invention further relates to a low-pressure circuit of a fuel injection system, in particular of a common rail injection system, having a fuel passage (2) into which a throttle element (1) according to the invention is inserted.
Description
Technical Field
The present invention relates to a throttling element. The proposed throttle element can be inserted into a fuel passage of a low-pressure circuit of a fuel injection system, in particular of a common rail injection system, in order to throttle a fuel flow flowing through the fuel passage in a main flow direction. The invention further relates to a low-pressure circuit of a fuel injection system having a fuel passage into which such a throttle element is inserted.
Background
DE 102009001564 a1 discloses a throttle element which can be inserted into a fuel passage for throttling a fuel flow flowing through the fuel passage in a main flow direction, having a sealing section which interacts with the fuel passage and has a throttle opening and a filter section which is arranged upstream of the throttle opening in the main flow direction. In order to be able to insert the throttle element as a zero-delivery throttle into the low-pressure circuit of the fuel injection system, the throttle element furthermore has a filter element arranged downstream of the throttle opening in the main flow direction. The filter element should prevent the introduction of particles when the flow in the low-pressure circuit is reversed. If, for example, a manual pump is used after empty-box driving for the venting of the low-pressure circuit, the flow direction is reversed in the low-pressure circuit. A filter element arranged downstream of the throttle opening in the main flow direction prevents unfiltered fuel from reaching the throttle opening and particles contained in the fuel from blocking the throttle opening.
Disclosure of Invention
Starting from the prior art described above, the object of the present invention is to provide a throttle element which can be inserted into the fuel passage of a low-pressure circuit and which has a high functional reliability and can be produced simply and inexpensively.
The invention relates to a throttle element which can be inserted into a fuel passage of a low-pressure circuit of a fuel injection system for throttling a fuel flow flowing through the fuel passage in a main flow direction, comprising a sealing section interacting with the fuel passage, in the region of which a throttle bore is formed, and further comprising at least one filter section interacting with the fuel passage as an annular gap filter, which filter section is separated from the sealing section by an annular groove,
wherein the orifice hole has a tendency to tilt at an angle relative to a longitudinal axis of the throttling element, wherein the angle is less than 90,
wherein annular grooves are arranged on both sides of the sealing section, respectively, and
wherein the annular grooves arranged on both sides of the sealing section communicate via the throttle bore and at least one further bore such that a throughflow through the throttle element is ensured,
wherein the at least one further bore and the throttle bore are arranged at an angle to one another such that the throttle bore opens laterally into the further bore.
Furthermore, a low-pressure circuit of a fuel injection system having a throttle element according to the invention is specified.
The proposed throttle element can be inserted into a fuel passage of a low-pressure circuit of a fuel injection system, in particular a common rail injection system, for throttling a fuel flow flowing through the fuel passage in a main flow direction, and comprises a sealing section interacting with the fuel passage, in the region of which a throttle bore is formed, and at least one filter section interacting with the fuel passage as an annular gap filter, which filter section is separated from the sealing section by an annular groove. According to the invention, the throttle bore has a profile which is inclined at an angle α relative to the longitudinal axis a of the throttle element, wherein the angle α is less than 90 °, preferably less than 60 °, further preferably less than 45 °. The inclined position of the throttle bore enables a one-piece embodiment of the throttle element, in particular even if a filter section is formed in each case upstream and downstream of the throttle bore, which filter section interacts with the fuel passage to form an annular gap filter. I.e., eliminating the engagement process and simplifying the manufacture of the throttling element.
Furthermore, the one-piece embodiment of the throttle element has the following advantages: the sealing section is less tolerant, so that bypassing the throttle bore is reliably avoided via the annular gap between the sealing section and the fuel passage. Since, as in the throttling elements known from the prior art, further parts are engaged in the region of the sealing section, axial misalignment of the parts relative to one another can, for example, lead to the formation of gaps in the fuel passage, which axial misalignment counteracts the sealing action of the sealing section.
In order to be able to use the throttle element as a zero-delivery throttle in particular in a low-pressure circuit of a fuel injection system, it is proposed that an annular groove and a filter section which interacts with the fuel passage as an annular gap filter are arranged on both sides of the sealing section. The filter segments arranged on both sides prevent the introduction of particles not only in the main flow direction but also in the opposite direction. In this way, a high functional reliability is achieved, since the risk of blocking the throttle bore is significantly reduced.
Preferably, the annular grooves arranged on both sides of the sealing section communicate via the throttle bore and at least one further bore, so that a throughflow through the throttle element is ensured. The throttle bore and the at least one further bore thus form a bypass which can bypass the sealing section. In this case, the at least one further bore preferably has a throughflow cross section which is not throttled, so that only one throttle bore is formed.
In a development of the invention, it is provided that the at least one further bore has a profile which is inclined at an angle β relative to the longitudinal axis a, wherein the angle β is less than 90 °, preferably less than 60 °, further preferably less than 45 °. The inclined profile of the at least one further bore facilitates the manufacture of the throttle element, since the throttle element can further be constructed in one piece. The angle of inclination β is dependent in particular on the diameter and/or on the length of the sealing section, wherein an angle as small as possible leads to an optimization of the flow. The same applies to determining the angle a at which the orifice is inclined relative to the longitudinal axis a.
The at least one further bore and the throttle bore may be arranged at an angle to one another, so that the throttle bore opens laterally into the further bore.
Furthermore, the throttle bore and the at least one further bore may be arranged coaxially, thereby further simplifying the manufacture of the throttle element.
Advantageously, the throttle bore and/or the at least one further bore each open into one of the annular grooves in the groove flank region. On the one hand, the flow through the throttle element is thereby optimized. On the other hand, the production of the throttle bore and/or the at least one further bore is simplified. This applies in particular when the groove flanks are inclined relative to the perpendicular to the longitudinal axis a according to a preferred embodiment of the invention. The inclination of the groove flanks is selected such that the annular groove opens radially outward.
It is also proposed that the annular groove located downstream of the throttle bore in at least the main flow direction has two groove flanks which are inclined relative to the perpendicular to the longitudinal axis a, so that the annular groove opens radially outward. Thus, a further optimization of the flow in the main flow direction is achieved.
Furthermore, a low-pressure circuit of a fuel injection system, in particular of a common rail injection system, having a fuel passage into which a throttle element according to the invention is inserted is proposed. The throttle element forms a particle protection independent of direction, so that this particle protection is also ensured in the event of a flow reversal. Preferably, the throttle element is pressed into the fuel passage by its sealing section, so that an optimized sealing is brought about by the press fit. To this end, the sealing section of the throttle element is designed with a press fit interference with respect to the fuel passage. The press connection can be realized particularly simply and inexpensively, since, unlike a threaded connection, no thread has to be cut.
In a further development of the invention, it is therefore proposed that the fuel passage is formed in a housing part of the high-pressure fuel pump and that the throttle element inserted, preferably pressed, into this housing part forms a zero-delivery throttle, since the advantages of the invention are particularly apparent here.
Drawings
Preferred embodiments of the present invention are explained in more detail below with reference to the accompanying drawings. The figures show:
figure 1 is a schematic longitudinal section through a throttling element according to the invention according to a first preferred embodiment,
FIG. 2 is a schematic longitudinal section of a throttling element according to the invention according to a second preferred embodiment, and
fig. 3 shows the throttle element of fig. 1 as a component of a high-pressure fuel pump.
Detailed Description
The cylindrical throttle element 1 shown in fig. 1, which is pressed into the fuel passage 2, has two annular grooves 7,8 on the outer circumferential side, which divide the throttle element 1 into a central sealing section 3 and two end- side filter sections 5, 6. The central sealing section 3 has a press fit interference with respect to the fuel passage 2, so that a press fit of the throttle element 1 results therefrom. In contrast, the two end- side filter segments 5,6 interact with the fuel channel 2 in such a way that: an annular gap filter 14 is formed at each end, which prevents the introduction of particles. In the region of the filter segments 5,6, the fuel therefore flows past the throttle element 1 on the outside and thus reaches one of the two annular grooves 7, 8. The seal section 3 can be bypassed by means of an orifice 4 and a further bore 9, which are arranged in the throttle element 1 in such a way that they communicate with the annular grooves 7, 8.
In the main flow direction, the throttle element 1 flows in through the filter section 5, so that particulate matter possibly contained in the fuel is deposited before an annular gap filter 14, which is formed between the filter section 5 and the fuel channel 2. Thus, only filtered fuel reaches the annular groove 7. In the transition to the sealing section 3, the annular groove 7 has an inclined groove flank 10, via which the throttle bore 4 opens into the annular groove 7.
The inclined groove flank 10 facilitates the design of the throttle bore 4, which is currently embodied as inclined at an angle α to the longitudinal axis a of the throttle element 1. The throttle bore 4 opens at the other end into a further bore 9 which is arranged at an angle β to the longitudinal axis a, wherein the angle β is equal to the angle α, and wherein the throttle bore 4 and the further bore 9 are arranged coaxially. The angle α or the angle β is selected such that the further bore 9 opens into the annular groove 8 in the region of the likewise obliquely embodied groove flank 11, so that the required communication between the two annular grooves 7,8 is established via the throttle bore 4 and the further bore 9. The fuel is then discharged via an annular gap filter 14, which is connected to the annular groove 8 and which is formed between the further filter section 6 and the fuel channel 2. In this case, a further obliquely embodied groove flank 12 of the annular groove 8 optimizes the flow guidance.
If the flow direction is reversed such that the throttle element 1 is exposed to the flow via the filter section 6, the annular filter portion 14 formed between the filter section 6 and the fuel channel 2 forms an effective particle protection. The particle protection which can be produced via the throttling element 1 is therefore independent of the flow direction. At the same time, the throttle element 1 can be produced simply and inexpensively, since it is embodied in one piece. This one-piece embodiment can be realized by the position of the throttle bore 4 and the at least one further bore 9.
Fig. 2 shows a variant of the embodiment of fig. 1. Here, the throttle bore 4 and the further bore 9 are not arranged coaxially, but at an angle relative to one another. This results in the throttle bore 4 opening laterally into the further bore 9. The embodiment of this variant can be determined in particular by the geometry and simplifies the implementation of the throttle bore 4 and/or the further bore 9.
Fig. 3 shows an exemplary housing part 13 of a high-pressure fuel pump having a fuel passage 2 into which the throttle element 1 of fig. 1 is inserted or pressed. The throttle element 1 in this application serves as a zero feed throttle in order to supply an excess amount of fuel from the inflow region 15 of the high-pressure fuel pump to the return 16 in the event of zero feed of the high-pressure fuel pump. The inflow region 15 is also a part of a low-pressure circuit to which a high-pressure fuel pump for supplying fuel is connected, as is the return portion 16.
Claims (14)
1. A throttle element (1) which can be inserted into a fuel passage (2) of a low-pressure circuit of a fuel injection system for throttling a fuel flow flowing through the fuel passage (2) in a main flow direction, comprising a sealing section (3) which interacts with the fuel passage (2) and in the region of which a throttle bore (4) is formed, and furthermore comprising at least one filter section (5,6) which interacts with the fuel passage (2) as an annular gap filter (14) and is separated from the sealing section (3) by an annular groove (7,8),
wherein the throttle bore (4) has a tendency to tilt at an angle (a) relative to the longitudinal axis (A) of the throttle element (1), wherein the angle (a) is smaller than 90 DEG,
wherein annular grooves (7,8) are arranged on both sides of the sealing section (3) and
wherein the annular grooves (7,8) communicate via the throttle bore (4) and at least one further bore (9) such that a throughflow through the throttle element (1) is ensured,
characterized in that the at least one further bore (9) and the throttle bore (4) are arranged at an angle to one another such that the throttle bore (4) opens laterally into the further bore (9).
2. Throttling element (1) according to claim 1,
characterized in that filter segments (5,6) which interact with the fuel channel (2) as the annular gap filter (14) are arranged on both sides of the sealing segment (3).
3. Throttling element (1) according to claim 1 or 2,
characterized in that said at least one further hole (9) has a tendency to be inclined at an angle (β) with respect to said longitudinal axis (A), wherein said angle (β) is less than 90 °.
4. Throttling element (1) according to claim 1 or 2,
characterized in that the throttle bore (4) and/or the at least one further bore (9) each open into one of the annular grooves (7,8) in the region of a groove flank (10, 11).
5. Throttling element (1) according to claim 4,
characterized in that the groove flanks (10,11) are inclined with respect to a perpendicular to the longitudinal axis (A).
6. Throttling element (1) according to claim 4,
characterized in that the annular groove (8) located downstream of the throttle bore (4) at least in the main flow direction has two groove flanks which are inclined relative to the perpendicular to the longitudinal axis (A) such that the annular groove (8) opens radially outward.
7. Throttling element (1) according to claim 1,
characterized in that the fuel injection system is a common rail injection system.
8. Throttling element (1) according to claim 1,
characterized in that said angle (α) is less than 60 °.
9. Throttling element (1) according to claim 1,
characterized in that said angle (α) is less than 45 °.
10. Throttling element (1) according to claim 3,
characterized in that said angle (β) is less than 60 °.
11. Throttling element (1) according to claim 3,
characterized in that said angle (β) is less than 45 °.
12. A low-pressure circuit of a fuel injection system, having a fuel passage (2) into which a throttle element (1) according to any one of the preceding claims is inserted.
13. The low-pressure circuit of claim 12,
characterized in that the fuel channel (2) is formed in a housing part (13) of the high-pressure fuel pump and the throttle element (1) inserted into the housing part forms a zero delivery throttle.
14. The low-pressure circuit of claim 12,
characterized in that the fuel injection system is a common rail injection system.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102017202310.4A DE102017202310A1 (en) | 2017-02-14 | 2017-02-14 | Throttle element and low-pressure circuit of a fuel injection system with a throttle element |
| DE102017202310.4 | 2017-02-14 | ||
| PCT/EP2018/053328 WO2018149752A1 (en) | 2017-02-14 | 2018-02-09 | Throttle element, and low pressure circuit of a fuel injection system having a throttle element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110312861A CN110312861A (en) | 2019-10-08 |
| CN110312861B true CN110312861B (en) | 2021-08-31 |
Family
ID=61231238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880011874.3A Active CN110312861B (en) | 2017-02-14 | 2018-02-09 | Throttle element and low-pressure circuit of a fuel injection system having a throttle element |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN110312861B (en) |
| DE (1) | DE102017202310A1 (en) |
| WO (1) | WO2018149752A1 (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19640085C1 (en) * | 1996-09-28 | 1998-04-02 | Orange Gmbh | Stop valve to limit the flow rate |
| CN1185525A (en) * | 1996-12-19 | 1998-06-24 | 日野汽车工业株式会社 | Injection device for injection of fuel |
| EP0947690A2 (en) * | 1998-03-28 | 1999-10-06 | Robert Bosch Gmbh | Fluid control valve |
| CN1252854A (en) * | 1997-04-21 | 2000-05-10 | 曼B与W狄赛尔公司 | Fuel injection pump for IC engines, in particular big, slow marine diesel engines |
| US6422208B1 (en) * | 1998-12-11 | 2002-07-23 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engines |
| CN101004160A (en) * | 2006-01-20 | 2007-07-25 | 株式会社电装 | Common rail having orifice |
| DE102009001564A1 (en) * | 2009-03-16 | 2010-09-23 | Robert Bosch Gmbh | Throttle element for low-pressure circuit of common rail system of motor vehicle, has filter element provided at section of throttle element, where section is provided upstream of throttle opening |
| DE102011084356A1 (en) * | 2011-10-12 | 2013-04-18 | Robert Bosch Gmbh | High-pressure fuel pump i.e. radial piston pump, for fuel injection system, has housing portion comprising bore for ventilating engine compartment of pump and throttle, and edge filter inserted into bore for formation of throttle |
| DE102011089797A1 (en) * | 2011-12-23 | 2013-06-27 | Robert Bosch Gmbh | Overflow valve for common-rail injection system utilized for injecting fuel into combustion chamber of air-compressing, self-igniting internal combustion engine, has spring element supported on adjustment element comprises ventilation hole |
| DE102013210983A1 (en) * | 2013-06-12 | 2014-12-18 | Mtu Friedrichshafen Gmbh | Flow regulator |
| CN105888906A (en) * | 2008-10-28 | 2016-08-24 | 罗伯特·博世有限公司 | Fuel high-pressure pump for internal combustion engine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011101258A1 (en) * | 2011-05-11 | 2012-11-15 | Voss Automotive Gmbh | "Pressure relief valve" |
-
2017
- 2017-02-14 DE DE102017202310.4A patent/DE102017202310A1/en not_active Withdrawn
-
2018
- 2018-02-09 CN CN201880011874.3A patent/CN110312861B/en active Active
- 2018-02-09 WO PCT/EP2018/053328 patent/WO2018149752A1/en active Application Filing
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19640085C1 (en) * | 1996-09-28 | 1998-04-02 | Orange Gmbh | Stop valve to limit the flow rate |
| CN1185525A (en) * | 1996-12-19 | 1998-06-24 | 日野汽车工业株式会社 | Injection device for injection of fuel |
| CN1252854A (en) * | 1997-04-21 | 2000-05-10 | 曼B与W狄赛尔公司 | Fuel injection pump for IC engines, in particular big, slow marine diesel engines |
| EP0947690A2 (en) * | 1998-03-28 | 1999-10-06 | Robert Bosch Gmbh | Fluid control valve |
| US6422208B1 (en) * | 1998-12-11 | 2002-07-23 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engines |
| CN101004160A (en) * | 2006-01-20 | 2007-07-25 | 株式会社电装 | Common rail having orifice |
| CN105888906A (en) * | 2008-10-28 | 2016-08-24 | 罗伯特·博世有限公司 | Fuel high-pressure pump for internal combustion engine |
| DE102009001564A1 (en) * | 2009-03-16 | 2010-09-23 | Robert Bosch Gmbh | Throttle element for low-pressure circuit of common rail system of motor vehicle, has filter element provided at section of throttle element, where section is provided upstream of throttle opening |
| DE102011084356A1 (en) * | 2011-10-12 | 2013-04-18 | Robert Bosch Gmbh | High-pressure fuel pump i.e. radial piston pump, for fuel injection system, has housing portion comprising bore for ventilating engine compartment of pump and throttle, and edge filter inserted into bore for formation of throttle |
| DE102011089797A1 (en) * | 2011-12-23 | 2013-06-27 | Robert Bosch Gmbh | Overflow valve for common-rail injection system utilized for injecting fuel into combustion chamber of air-compressing, self-igniting internal combustion engine, has spring element supported on adjustment element comprises ventilation hole |
| DE102013210983A1 (en) * | 2013-06-12 | 2014-12-18 | Mtu Friedrichshafen Gmbh | Flow regulator |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018149752A1 (en) | 2018-08-23 |
| CN110312861A (en) | 2019-10-08 |
| DE102017202310A1 (en) | 2018-08-16 |
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