CN103201495B - The fuel injection system of internal combustion engine - Google Patents
The fuel injection system of internal combustion engine Download PDFInfo
- Publication number
- CN103201495B CN103201495B CN201180052758.4A CN201180052758A CN103201495B CN 103201495 B CN103201495 B CN 103201495B CN 201180052758 A CN201180052758 A CN 201180052758A CN 103201495 B CN103201495 B CN 103201495B
- Authority
- CN
- China
- Prior art keywords
- pump
- injection system
- fuel injection
- valve
- pressure
- 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.)
- Active
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 31
- 238000002347 injection Methods 0.000 title claims abstract description 21
- 239000007924 injection Substances 0.000 title claims abstract description 21
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 6
- 238000010992 reflux Methods 0.000 claims abstract description 22
- 239000002828 fuel tank Substances 0.000 claims abstract description 11
- 239000000314 lubricant Substances 0.000 claims description 3
- 230000033228 biological regulation Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000001143 conditioned effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000010959 steel 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
- 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
-
- 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
- F02M59/205—Quantity of fuel admitted to pumping elements being metered by an auxiliary metering device
-
- 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
-
- 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
- F02M37/0047—Layout or arrangement of systems for feeding fuel
- F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
-
- 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
-
- 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
- F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
- F02M37/0023—Valves in the fuel supply and return system
- F02M37/0029—Pressure regulator in the low pressure fuel system
Landscapes
- 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 fuel injection system of internal combustion engine, there is a fuel tank (2), this fuel tank is connected with room (3) in the pump of a high-pressure pump (5) by a precondition pressure pump (1), wherein in this pump, room (3) are connected with a pump working chamber (9) by a metering units (10), in this pump, room (3) have a valve chest (17) by one again, the overflow valve (16) of one valve piston (18) and a valve spring (19) being located in spring housing (15) forms hydraulic connecting with a reflux pipe (7), it is characterized in that: described spring housing (15) is connected, by described metering units (10), the hydraulic pressure chamber with one by a throttle and is connected.Thering is provided a kind of fuel injection system according to the present invention, wherein, the filling pressure of pump working chamber (9) can regulate relevantly with conveying capacity.This is achieved in, and the most described spring housing (15) is connected, by described metering units (10), the hydraulic pressure chamber with one by a throttle and is connected.
Description
Technical field
The present invention relates to the fuel injection system of internal combustion engine, it has a fuel tank, and this fuel tank leads to
In crossing the pump of a precondition pressure pump and a high-pressure pump, room is connected, and wherein in this pump, room passes through one
Metering units and pump working chamber connect and in pump room again by one have a valve chest, one
Valve piston and the overflow valve of a valve spring being located in spring housing and a reflux pipe form hydraulic pressure even
Connect.
Background technology
The fuel injection system of this internal combustion engine is by known in DE 10 2,008 042 089 A1.At this
The hydraulic pressure chamber of metering units connected in fuel injection system is by a fuel conduit and high-pressure pump three
Individual pump working chamber connects.The overflow valve of this fuel injection system has one with the choke valve inserted
Hollow hole piston, this piston makes the spring housing of this overflow valve be connected with its input port.By this configuration meter
Precompression on amount unit input should be conditioned than the most more equilibrium and also will reliably avoid making
With steel make connecting line in the case of occur squeal-noise.
In addition known: to be connected the hydraulic pressure chamber by metering units by a so-called zero conveying throttling
Valve and fuel tank or lead to the intake line of precondition pressure pump and be connected.Worked as by this zero conveying choke valve
The leakage that when being adjusted to zero output, metering units is possible should be able to be exported.
Summary of the invention
The task of the present invention is then, it is provided that a fuel injection system, the wherein filling of pump working chamber
Pressure can be conditioned relatively with conveying capacity.
This task will so solve: spring housing is single by metering with one by a throttle
The hydraulic pressure chamber that Rhizoma Coptidis picks out is connected.Will by this throttle playing pressure distributor effect
With metering units control pressure correlation be adjusted in the spring housing of overflow valve one higher or lower
Pressure, this overflow valve is just a differential pressure control valve.Therefore the pressure before overflow valve is by valve bullet
The characteristic purely mechanic composition of spring and the fluid pressure composition in spring housing.Because the pressure in spring housing
Power can be changed, therefore the also alterable of the pressure before overflow valve.
In a further configuration of the present invention, throttle is a choke valve with access
Conduit connection divide.Because metering units and overflow valve generally directly combine the pump case at high-pressure pump
In body, this conduit connection divides such as can be configured interface channel.Choke valve passes through one in the case
The individual restricting element being embedded in this interface channel realizes or also can be divided by conduit connection manufacturing
Diameter in journey reduces and realizes.
In a further configuration of the present invention, spring housing is connected with reflux pipe, wherein at another
Configuration has accessed in reflux pipe a backflow choke valve.Reflux pipe also can be with in the case
Conduit connection divides and is connected on the optional position after the choke valve accessed, and wherein reflux choke valve
Must be in the access return flow line, downstream of this link position.
In another configuration of the present invention, choke valve has the throttle rate lower than backflow choke valve.In other words
Say the through flow cross section through flow cross section more than backflow choke valve of choke valve.By this coordination in metering
When unit is opened, the pressure of spring housing rises, and the pressure in spring housing is gradually when metering units is closed
Fall to approximately in return pressure level.Suitable association by the diameter of choke valve and backflow choke valve
The pressure differential between the open position and make position of metering units is adjusted almost can at random to be regulated.
In a further configuration of the present invention, choke valve and/or backflow choke valve are respectively above connecting
One filter, this filter such as can be configured gap filter in a configuration.By this mistake
Filter or gap filter will reliably protect choke valve to avoid contaminant particle.
In another configuration of the present invention, a control discharge line of overflow valve is connected with reflux pipe
Connect.Similarly the bearing lubricant discharge line at another configuration mesohigh pump is connected with reflux pipe.
Can realize fuel injection system cramped construction in high pressure pump area by these configurations, its mode is
In high-pressure pump, all respective line are all passed through in reflux pipe, and this reflux pipe passes through by rights
One exterior line coupling part is connected with fuel tank.
The most apparently by can reach following effect according to the structure of the present invention:
Apply relatively with conveying capacity to fill pressure, such as, be adjusted to when high filling requirement high
Fill pressure and be adjusted to low filling pressure when only needing and carrying little fuel quantity.
Reach the most broadening working region, in other words, can stably regulate variable pressure level.
By single overflow valve (only by an adjusting means) by choke valve and the throttling of backflow choke valve
The change of diameter can realize different pressure levels.
Can reach the little component load of mainly valve spring.
Owing to avoiding the change of component and avoiding the decline using the valve spring of high value to reach cost,
And make regulation pressure adjustable save higher than known scheme simultaneously.
There is little structure space requirement, because along with the increase valve of regulation pressure in known configurations
Its length of spring also increases, especially in feelings pressure oscillation being devised to enough wobble length
Under condition.
In so-called single regulator system (pressure regulation is only regulated by metering units), choke valve
Additionally undertake the function of zero conveying throttling.
Backflow choke valve can additionally undertake the function of spring housing's buffering throttling.
Other configuration of the present invention can obtain from the description of the drawings, will be described in this explanation
Embodiments of the invention shown in accompanying drawing.
Accompanying drawing explanation
Unique accompanying drawing represents the phase of the key component of a fuel injection system according to the present invention
The sketch plan coordinated mutually.
Detailed description of the invention
Fuel from a fuel tank 2 is carried by a defecator by a precondition pressure pump 1
In the pump of a high-pressure pump 5 in room 3.
High-pressure pump 5 has a pump case, and a pump camshaft is rotatably supported in position of bearings 4a,
In 4b.Position of bearings 4a, 4b, by fuel lubricated and at position of bearings 4a, are gone out by room in pump 3 at 4b
The fuel come is derived passage 6a, 6b by bearing lubricant and is discharged in a reflux pipe 7, this time
Flow tube road is passed through in fuel tank 2.When pump camshaft rotary motion, pump camshaft is pushed away by a roller
Bar moves with making pump piston upper and lower translation.Pump piston 8 cooperates with a pump working chamber 9, this pump
Operating room is connected with room in pump 3 by a metering units 10.Such as can root by metering units 10
The fuel quantity being input to pump working chamber 9 is arbitrarily regulated according to the pressure in high-pressure storage.When pump piston 8
The fuel being injected into pump working chamber when moving upward is transported to high-pressure storage by a pressure duct 11
In.The suction valve of the fuel being desirable for implantation into pump working chamber 9 is run and for blocking for this conveying
The one way stop peturn valve of pressure duct 11 is by the pumping cylinder head 12 being directly embedded in high-pressure pump 5.
The hydraulic pressure chamber (being expressed as leading to the connecting line 13 of pump working chamber 9) is connected by metering units
Either directly or indirectly it is connected with the spring housing of an overflow valve 16 by a connecting line 14.Should
Overflow valve 16 has a valve chest 17, and a valve piston 18 can resist the power of valve spring 19 at this valve
Housing moves.One valve control room 20 by access a filter also with room in pump 3 (or with logical
Intake line to metering units 10) connect.When the fuel pressure in room 3 in pump raises by meter
The closing of amount unit 10 makes valve piston 18 move towards the direction of spring housing 15 and make control outlet release
Putting, this control outlet controls discharge line 21 with one and is connected, and this control discharge line is also passed into
Reflux pipe 7.Such as made by precondition pressure when being arranged on zero conveying by this control discharge line 21
Transport pump and do not controlled to discharge for the fuel needed for bearing lubrication.
As described, metering units 10 connect the hydraulic pressure chamber (connecting line 13) by a company
Adapter road 14 is connected with spring housing 15.Here in connecting line 14, access a choke valve 22.This
Outer spring room 15 is connected with reflux pipe 7, wherein inserts near spring housing in reflux pipe 7
One backflow choke valve 23.If connecting line 14 is as shown in figure by reflux pipe 7
Be connected with spring housing 15, then backflow choke valve 23 is under any circumstance arranged on and is passed through under position
Trip.The throttling diameter of choke valve 22 is more than the throttling diameter of backflow choke valve 23, so that measuring list
In the case of unit 10 opens, pressure in spring housing 15 rises, and situation about closing at metering units 10
Pressure in lower spring room 15 drops on the pressure in reflux pipe 7 continuously.
Choke valve 22 and backflow choke valve 23 can connect filter, especially gap filter before it.
Claims (10)
1. the fuel injection system of internal combustion engine, has a fuel tank (2), and this fuel tank passes through one
Precondition pressure pump (1) is connected with room (3) in the pump of a high-pressure pump (5), wherein room in this pump
(3) it is connected with a pump working chamber (9) by a metering units (10), room (3) in this pump
By one, there is a valve chest (17), a valve piston (18) and one again and be located at spring housing (15)
In the overflow valve (16) of valve spring (19) form hydraulic connecting with reflux pipe (7), its
It is characterised by: described spring housing (15) is single by described metering with one by a throttle
Unit (10) connects the hydraulic pressure chamber and is connected.
Fuel injection system the most according to claim 1, it is characterised in that: described throttle
It is that a conduit connection with the choke valve (22) accessed divides (14).
3. according to the fuel injection system of claim 1 or 2, it is characterised in that: described spring housing (15)
It is connected with described reflux pipe (7).
Fuel injection system the most according to claim 3, it is characterised in that: in described reflux pipe (7)
In accessed a backflow choke valve (23).
Fuel injection system the most according to claim 4, it is characterised in that: described choke valve (22)
There is the throttle rate lower than described backflow choke valve (23).
Fuel injection system the most according to claim 4, it is characterised in that: described choke valve (22)
And/or described backflow choke valve (23) is respectively above connecting a filter.
Fuel injection system the most according to claim 6, it is characterised in that: this filter is a seam
Gap filter.
8. according to the fuel injection system of claim 1 or 2, it is characterised in that: described overflow valve (16)
One control discharge line (21) be connected with described reflux pipe (7).
9. according to the fuel injection system of claim 1 or 2, it is characterised in that: described high-pressure pump (5)
Bearing lubricant discharge line (6a, 6b) be connected with described reflux pipe (7).
10. according to the fuel injection system of claim 1 or 2, it is characterised in that: described reflux pipe
(7) it is passed in described fuel tank (2).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010043439.6 | 2010-11-05 | ||
| DE102010043439A DE102010043439A1 (en) | 2010-11-05 | 2010-11-05 | Fuel injection system of an internal combustion engine |
| PCT/EP2011/066401 WO2012059267A1 (en) | 2010-11-05 | 2011-09-21 | Fuel injection system of an internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103201495A CN103201495A (en) | 2013-07-10 |
| CN103201495B true CN103201495B (en) | 2016-08-17 |
Family
ID=44653344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180052758.4A Active CN103201495B (en) | 2010-11-05 | 2011-09-21 | The fuel injection system of internal combustion engine |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP2635791B1 (en) |
| JP (1) | JP5727617B2 (en) |
| KR (1) | KR101900965B1 (en) |
| CN (1) | CN103201495B (en) |
| DE (1) | DE102010043439A1 (en) |
| RU (1) | RU2573068C2 (en) |
| WO (1) | WO2012059267A1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9422898B2 (en) | 2013-02-12 | 2016-08-23 | Ford Global Technologies, Llc | Direct injection fuel pump |
| US9599082B2 (en) | 2013-02-12 | 2017-03-21 | Ford Global Technologies, Llc | Direct injection fuel pump |
| US9429124B2 (en) | 2013-02-12 | 2016-08-30 | Ford Global Technologies, Llc | Direct injection fuel pump |
| DE102013212145A1 (en) * | 2013-06-25 | 2015-01-08 | Robert Bosch Gmbh | pump |
| DE102013226649A1 (en) * | 2013-12-19 | 2015-06-25 | Robert Bosch Gmbh | Fuel supply device of a fuel injection system of an internal combustion engine and overflow valve to it |
| US9683512B2 (en) | 2014-05-23 | 2017-06-20 | Ford Global Technologies, Llc | Pressure device to reduce ticking noise during engine idling |
| DE102014223240A1 (en) * | 2014-11-14 | 2016-05-19 | Robert Bosch Gmbh | Low pressure control system of a fuel delivery system of a fuel injection system and a Absteuerventil thereto |
| DE102014223788A1 (en) * | 2014-11-21 | 2016-05-25 | Robert Bosch Gmbh | Pressure control device, in particular for a fluid-conveying high-pressure pump |
| DE102018211338A1 (en) * | 2018-07-10 | 2020-01-16 | Robert Bosch Gmbh | Fuel delivery device for cryogenic fuels and method for operating a fuel delivery device |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2071572C1 (en) * | 1992-10-15 | 1997-01-10 | Ефим Яковлевич Мошинский | High-pressure fuel injection pump |
| DE19846157A1 (en) * | 1998-10-07 | 2000-04-13 | Bosch Gmbh Robert | Pump arrangement for high-pressure fuel generation |
| JP3709755B2 (en) * | 1999-12-08 | 2005-10-26 | 日産自動車株式会社 | Fuel supply device for internal combustion engine |
| DE10100700C1 (en) * | 2001-01-10 | 2002-08-01 | Bosch Gmbh Robert | Fuel injection system with pressure control in the return line |
| RU2241850C2 (en) * | 2002-12-31 | 2004-12-10 | Мошинский Ефим Яковлевич | Fuel system |
| CN100460667C (en) * | 2004-02-06 | 2009-02-11 | 博世株式会社 | Fuel supply system |
| DE102005033638A1 (en) * | 2005-07-19 | 2007-01-25 | Robert Bosch Gmbh | Fuel conveyor, in particular for an internal combustion engine |
| DE102006027486A1 (en) * | 2006-06-14 | 2007-12-20 | Robert Bosch Gmbh | Fuel injection device for an internal combustion engine |
| DE102007052665A1 (en) * | 2007-11-05 | 2009-05-07 | Robert Bosch Gmbh | Fuel overflow valve for a fuel injector and fuel injector with fuel spill valve |
| US20090211556A1 (en) * | 2008-02-25 | 2009-08-27 | Perkins Engines Company Limited | System for maintaining a pump inlet pressure |
| DE102008042089A1 (en) | 2008-09-15 | 2010-03-18 | Robert Bosch Gmbh | Overflow valve for inlet pipe of dosing unit of high-pressure pump of fuel injecting device of internal combustion engine, has spring area that is connected with inlet via pressure balance pipeline, where throttle is provided in pipeline |
| DE102009001563A1 (en) * | 2009-03-16 | 2010-09-23 | Robert Bosch Gmbh | high pressure pump |
| JP5464649B2 (en) * | 2009-09-07 | 2014-04-09 | ボッシュ株式会社 | Control device for internal combustion engine |
| JP5314156B2 (en) * | 2009-10-23 | 2013-10-16 | ボッシュ株式会社 | Control device for internal combustion engine |
-
2010
- 2010-11-05 DE DE102010043439A patent/DE102010043439A1/en not_active Withdrawn
-
2011
- 2011-09-21 RU RU2013125689/06A patent/RU2573068C2/en active
- 2011-09-21 EP EP11757896.3A patent/EP2635791B1/en active Active
- 2011-09-21 KR KR1020137011510A patent/KR101900965B1/en active IP Right Grant
- 2011-09-21 JP JP2013537051A patent/JP5727617B2/en not_active Expired - Fee Related
- 2011-09-21 CN CN201180052758.4A patent/CN103201495B/en active Active
- 2011-09-21 WO PCT/EP2011/066401 patent/WO2012059267A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| RU2013125689A (en) | 2014-12-10 |
| CN103201495A (en) | 2013-07-10 |
| KR101900965B1 (en) | 2018-09-20 |
| DE102010043439A1 (en) | 2012-05-10 |
| EP2635791B1 (en) | 2015-01-07 |
| EP2635791A1 (en) | 2013-09-11 |
| WO2012059267A1 (en) | 2012-05-10 |
| JP2013545015A (en) | 2013-12-19 |
| JP5727617B2 (en) | 2015-06-03 |
| RU2573068C2 (en) | 2016-01-20 |
| KR20130126906A (en) | 2013-11-21 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |