CN201236754Y - Hydrogen engine - Google Patents
Hydrogen engine Download PDFInfo
- Publication number
- CN201236754Y CN201236754Y CNU200820111390XU CN200820111390U CN201236754Y CN 201236754 Y CN201236754 Y CN 201236754Y CN U200820111390X U CNU200820111390X U CN U200820111390XU CN 200820111390 U CN200820111390 U CN 200820111390U CN 201236754 Y CN201236754 Y CN 201236754Y
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- Prior art keywords
- cylinder
- hydrogen
- engine
- gas
- fuel gas
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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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- 239000001257 hydrogen Substances 0.000 title claims abstract description 73
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 73
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 239000007789 gas Substances 0.000 claims abstract description 75
- 239000002737 fuel gas Substances 0.000 claims abstract description 31
- 238000002347 injection Methods 0.000 claims description 65
- 239000007924 injection Substances 0.000 claims description 65
- 239000000203 mixture Substances 0.000 claims description 32
- 239000007921 spray Substances 0.000 claims description 15
- 239000000567 combustion gas Substances 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 150000002431 hydrogen Chemical class 0.000 claims description 9
- 238000009826 distribution Methods 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 14
- 238000002485 combustion reaction Methods 0.000 abstract description 6
- 238000005496 tempering Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- 230000004044 response Effects 0.000 abstract description 3
- 230000002028 premature Effects 0.000 abstract 1
- 239000000446 fuel Substances 0.000 description 16
- 238000007599 discharging Methods 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003502 gasoline Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Images
Classifications
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- 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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Abstract
The utility model discloses a hydrogen engine, which comprises a fuel gas supplying system, an intake manifold, a CNG dedicated ignition plug and an air cylinder, wherein, fuel gas ejectors are arranged in different positions of the end part of the fuel gas supplying system, the end part of the fuel gas supplying system enters the cylinder cover of the engine; the hydrogen is directly ejected into the cylinder of the engine by the fuel gas ejectors; and the hydrogen can also be indirectly ejected into the cylinder of the engine after being mixed with inlet air in an intake port by the fuel gas ejectors. Compared with common hydrogen engine, the hydrogen engine which adopts the technical proposal and directly ejects the hydrogen into the cylinder by the engine has the advantages that higher compression ratio is adopted; higher gas charging efficiency and higher thermal efficiency are realized; the power and the running torque of the engine are increased; the power output is high; the response speed is high; and the like. Meanwhile, the combustion is improved; and the exhaust emission is reduced. The hydrogen engine solves the problems of premature combustion and tempering by adopting a control method which integrates the in-cylinder direct ejection and the intake port indirect ejection, simultaneously exerts the maximum capacity and the emission superiority of the hydrogen gas engine.
Description
Technical field
The utility model belongs to the technical field of automobile construction, relates to motor car engine, and more particularly, the utility model relates to a kind of hydrogen engine.
Background technique
Hydrogen engine generally adopts the outside mode that forms mixed gas in the market, adopts methods such as Carburetor, manifold injection and tuned port injection to form mixed gas usually.For hydrogen engine, be the simplest fuel feeding method by the Carburetor transfer the fuel, but carburetor engine is easy to generate malcombustions such as pre-ignition and tempering.Combustion gas with enter cylinder again after air mixes in air flue, cause the charging efficiency of hydrogen engine and the thermal efficiency not high, the output power deficiency.In addition, also can cause the increase of discharging.
The model utility content
Problem to be solved in the utility model provides a kind of hydrogen engine, its objective is that increasing power exports, improves combustion position, reduces discharging.
To achieve these goals, the technological scheme that the utility model is taked is: this hydrogen engine that is provided, comprise gas supply system, intake manifold, the special-purpose spark plug of CNG and cylinder, described gas supply system is established gas injector at the end diverse location that enters engine cylinder cover, and hydrogen directly sprays in the cylinder of motor by described gas injector; Perhaps hydrogen by described gas injector intake duct with spray into indirectly in the cylinder of motor after air inlet mixes.
For making the utility model more perfect, following more detailed and concrete technological scheme has also further been proposed, to obtain best practical effect:
Described gas injector comprises the external mix gas injector that is used for indirect injection and is used for the internal mix gas injector of direct injection.
Described external mix gas injector communicates with described cylinder with the connection mouth of cylinder head by intake manifold.
Described internal mix gas injector directly communicates with described cylinder by cylinder cap, and is positioned at the middle position of the cylinder cap of the special-purpose spark plug of next-door neighbour CNG.
Described gas supply system is provided with in proper order by following flow hydrogen gas: CNG steel cylinder, solenoid valve, pressure regulator, combustion gas spray rail, and until gas injector.
Described hydrogen engine is established the fuel gas injection ECU (Electrical Control Unit), and described fuel gas injection ECU (Electrical Control Unit) is connected with the special-purpose spark plug of solenoid valve, pressure regulator, external mix gas injector, internal mix gas injector and CNG respectively by signal line.
The described signal line that is connected with the fuel gas injection ECU (Electrical Control Unit), described signal line comprise the control command signal circuit that working condition signal sends control command to the signal feed back circuit and the fuel gas injection ECU (Electrical Control Unit) of the transmission of fuel gas injection ECU (Electrical Control Unit).
Described hydrogen engine, its gas distribution system adopts the timing mechanism of changing air valve phase and pulsewidth.
In order to realize the goal of the invention identical with technique scheme, the utility model also provides the burnt gas jet method that above-described hydrogen engine adopted, and this method is:
Control according to the operating conditions of motor by the fuel gas injection ECU (Electrical Control Unit), realize conversion to two kinds of control modes of cylinder inner direct fuel and intake duct indirect injection fuel; Promptly when sub load, at intake duct indirect injection fuel; When full load, at cylinder inner direct fuel;
Wherein, the control mode of cylinder inner direct is: under fuel gas injection ECU (Electrical Control Unit) control, motor adopts air inlet to end afterwards with inner cylinder direct injection device internal mix gas injector to in-cylinder injection hydrogen when full load, and ignition timing is suitably postponed; The control mode of intake duct indirect injection is: under the control of fuel gas injection ECU (Electrical Control Unit), motor adopts outside low pressure fuel injector device external mix gas injector at intake duct hydrogen to be mixed back indirect injection hydrogen in cylinder with air inlet when sub load;
When direct injection, pressure regulator is under the control of fuel gas injection ECU (Electrical Control Unit), with the pressure reduction of the hydrogen in the CNG steel cylinder, directly to in-cylinder injection.
The utility model adopts technique scheme, make motor when full load mode directly at in-cylinder injection hydrogen, by accurate control, thereby accurately control jet amount to jet phase place timing and jet pulsewidth timing; Compare with common hydrogen engine, the in-cylinder direct injection hydrogen engine can adopt higher compression ratio, obtains the higher charging efficiency and the thermal efficiency, the power and the moment of torsion of motor have been increased, advantage with aspects such as high power output, high response speeds is improved burning simultaneously, has reduced discharging.The control mode that the utility model adopts inner cylinder direct injection to combine with the intake duct indirect injection solves pre-ignition and tempering problem, has brought into play the maximum capacity and the discharging advantage of hydrogen engine simultaneously.
Description of drawings
Below expressed content of the accompanying drawing of this specification and the mark among the figure are made brief description:
Fig. 1 is a structural representation of the present utility model.
Be labeled as among the figure: 1, CNG steel cylinder, 2, solenoid valve, 3, pressure regulator, 4, combustion gas spray rail, 5, fuel gas injection ECU (Electrical Control Unit), 6, intake manifold, 7, the external mix gas injector, 8, cylinder cap, 9, piston, 10, cylinder, 11, gas exhaust manifold, 12, internal mix gas injector, 13, the special-purpose spark plug of CNG.
Embodiment
Contrast accompanying drawing below, by description to embodiment, to effect and working principle, the manufacturing process of the mutual alignment between the shape of embodiment of the present utility model such as related each member, structure, the each several part and annexation, each several part and manipulate method etc., be described in further detail, inventive concept of the present utility model, technological scheme had more complete, accurate and deep understanding to help those skilled in the art.
The of the present utility model structure expressed as Fig. 1, the utility model is a kind of hydrogen engine, its distribution and burning structure comprise gas supply system, intake manifold 6, the special-purpose spark plug 13 of CNG, cylinder 10, cylinder cap 8, the piston 9 that possesses the certain surface character shape, gas exhaust manifold 11 etc.Described gas supply system is provided with CNG steel cylinder 1 and corresponding gas pipeline, control unit.
In order to solve the problem that exists at the described present known technology of this specification background technique part and to overcome its defective, realize increasing power output, improve combustion position, reduce the purpose of discharging, the technological scheme that the utility model is taked is: as shown in Figure 1, the utility model is established gas injector at above-mentioned gas supply system at the end diverse location that enters engine cylinder cover, and hydrogen directly sprays in the cylinder 10 of motor by described gas injector; Perhaps hydrogen by described gas injector intake duct with spray into indirectly in the cylinder 10 of motor after air inlet mixes.
In conjunction with the motor of in-cylinder direct injection and intake port injection hydrogen, the cylinder cap 8 of special hydrogen nozzle and Variable Valve Time gear etc. is installed.This motor can make motor when sub load by the system that inside and outside fuel and gas mixing dual mode combine, and externally turns round under mixed form and the low pressure.Adjust the engines distribution phase places by VVT according to different operating modes, improve charging efficiency and realize internal EGR to NOX discharging control, thereby reach the purpose of high output low emission and low gas consumption, avoid pre-ignition and tempering problem simultaneously.
At the motor of inner cylinder direct injection hydrogen, reach the performance similar, and can realize the high power output under the lean-burn state to the conventional gasoline machine, reach simultaneously and improve burning, improve performance, reduce discharging.Hydrogen is directly injected in the cylinder, has improved charging efficiency; The control mode that the while in-cylinder direct injection is incorporated into the air flue indirect injection solves pre-ignition and tempering problem.By accurate control, thereby accurately control jet amount to the jet moment and jet pulsewidth; Compare with common hydrogen engine, the in-cylinder direct injection hydrogen engine can adopt higher compression ratio, obtains higher charging efficiency, brings the advantage of aspects such as high power output, high response speed, improves combustion position simultaneously.
Externally under mixing and the equivalent operating mode, by optimizing injection and can making valve timing engine load rise to IMEP=9bar.Because the hydrogen replaces air, this will reduce by 30% indicated mean effective pressure than directly jetting gasoline engine.The load that the hydrogen direct fuel-injection engine is reached obviously exceeds current petrol engine (maximum indicated mean effective pressure is 12-13bar under similar air fuel ratio).Discharging, oil consumption are starkly lower than the hydrogen engine with power.Than the higher rate of burning of petrol engine and reduced the loss that causes by partial combustion, also help to increase power output.
In order to make the utility model more perfect, also provide following exemplifying embodiment as the utility model reference in the specific implementation:
Embodiment one:
The described gas injector of above technology comprises external mix gas injector 7 that is used for indirect injection and the internal mix gas injector 12 that is used for direct injection.
Realize direct injection and indirect injection by these two different gas injectors.And according to the needs of actual conditions, that controls corresponding gas injector carries out fuel gas injection under different situations, or stops to spray.The combination of two kinds of gas injectors realizes described model utility purpose.
Embodiment two:
The structure mounting type of the external mix gas injector 7 described in the embodiment one: be to communicate with described cylinder 10 with the connection mouth of cylinder head 8 by intake manifold 6.
External mix gas injector 7 can use the KEIHIN two generations CNG sparger of 3.5bar to realize spraying.External mix gas injector 7 mixes hydrogen at intake duct, spray into cylinder 10 indirectly.
Embodiment three:
The structure mounting type of the internal mix gas injector 12 described in the embodiment one: be directly to communicate with described cylinder 10, and be positioned at the middle position of the cylinder cap 8 of the special-purpose spark plug 13 of next-door neighbour CNG by cylinder cap 8.
Internal mix gas injector 12 directly is sprayed on hydrogen in the cylinder.Directly be sprayed near the special-purpose spark plug 13 of CNG (between intake valve and the exhaust valve) owing to be positioned at the internal mix gas injector 12 of cylinder middle position, improved charging efficiency, promote the power of motor.
Embodiment four:
Gas supply system described in the foregoing description is provided with in proper order by following flow hydrogen gas: CNG steel cylinder 1, solenoid valve 2, pressure regulator 3, combustion gas spray rail 4, and until gas injector.
Hydrogen is pressed onto about 10Mpa through pressure regulator from the special hydrogen steel cylinder solenoid valve of flowing through, and directly sprays into hydrogen through the hydrogen nozzle in cylinder.
High pressure hydrogen flows out through CNG steel cylinder 1, and the pressure regulator 3 through solenoid valve 2, adjusting Hydrogen Vapor Pressure are used is evenly distributed to each combustion gas special-purpose ejecting device 7 or 12 from special use spray rail 4, is directly sprayed in intake duct or the cylinder by sparger 7 or 12 again.
CNG steel cylinder 1 is equivalent to the fuel tank of fuel engine, and being used to store combustion gas is hydrogen; Solenoid valve 2 is used to control the break-make of gas circuit; Pressure regulator 3 is used to regulate the pressure of combustion gas, mainly carries out the decompression of combustion gas; Special-purpose spray rail 4 is used for to each cylinder uniform distribution combustion gas.
Embodiment five:
Described hydrogen engine is established fuel gas injection ECU (Electrical Control Unit) 5, be combustion gas ECU5, described fuel gas injection ECU (Electrical Control Unit) 5 (ECU) is connected with the special-purpose spark plug 13 of solenoid valve 2, pressure regulator 3, external mix gas injector 7, internal mix gas injector 12 and CNG respectively by signal line.
By combustion gas ECU5 gaseous-pressure controlling device 3, two oil sprayers (being external mix gas injector 7 and internal mix gas injector 12), the special-purpose spark plug 13 of CNG, solenoid valves 2 are controlled, thereby guarantee that optimum igniting and oil spout are constantly, accurately control the air inflow of motor according to signal feed back, according to the work of two oil sprayers of difference control of operating mode.
Embodiment six:
The described signal line that is connected with fuel gas injection ECU (Electrical Control Unit) 5, described signal line comprise the control command signal circuit that working condition signal sends control command to the signal feed back circuit and the fuel gas injection ECU (Electrical Control Unit) 5 of 5 transmission of fuel gas injection ECU (Electrical Control Unit).
In Fig. 1, the arrow points ECU's on the signal line, be the signal feed back circuit that transmits to ECU; The circuit of each other parts of arrow points on the signal line is the control command signal circuit that ECU sends control command.On each parts, be equipped with the operating mode sensor, be used to obtain the information of the actual working state of each parts, and feed back to ECU, ECU analyzes, judges according to program and the real data set, and make decisions, send instruction and give each parts, realize satisfying the action control of different needs.
Embodiment seven:
Hydrogen engine described in the utility model, its gas distribution system adopts the timing mechanism of changing air valve phase and pulsewidth.
By the accurate control of timing mechanism, thereby accurately control jet amount, satisfy under different operating modes demand combustion gas to the jet moment and jet pulsewidth.The suitable postponement of ignition timing can significantly improve the charging efficiency of hydrogen engine, thereby improves the power of motor.
Embodiment eight:
In order to realize the goal of the invention identical with technique scheme, the utility model also provides the burnt gas jet method that above-described hydrogen engine adopted, and this method is:
Control according to the operating conditions of motor by fuel gas injection ECU (Electrical Control Unit) 5, realize conversion to two kinds of control modes of cylinder 10 inner direct fuel and intake duct indirect injection fuel; Promptly when sub load, at intake duct indirect injection fuel; When full load, at cylinder inner direct fuel;
Wherein, the control mode of cylinder inner direct is: under 5 controls of fuel gas injection ECU (Electrical Control Unit), motor when full load, adopt air inlet end the back with inner cylinder direct injection device internal mix gas injector 12 to in-cylinder injection hydrogen, ignition timing is suitably postponed; The control mode of intake duct indirect injection is: under 5 controls of fuel gas injection ECU (Electrical Control Unit), motor adopts outside low pressure fuel injector device external mix gas injector 7 at intake duct hydrogen to be mixed back indirect injection hydrogen in cylinder with air inlet when sub load;
When direct injection, pressure regulator 3 is under 5 controls of fuel gas injection ECU (Electrical Control Unit), with the pressure reduction of the hydrogen in the CNG steel cylinder 1, directly to in-cylinder injection.
When sub load, adopt outside external mix gas injector 7, can greatly reduce the discharging of NOx; With internal mix gas injector 12, the suitable postponement of ignition timing can significantly improve the charging efficiency of hydrogen engine after adopting air inlet to end during full load, thereby improves the power of motor.
ECU calculates fuel injection quantity according to air inflow, is reduced pressure about 10Mpar by the hydrogen of Hydrogen Vapor Pressure controlling device 3 with nearly 15Mpar in the CNG steel cylinder 1 of high pressure, directly to in-cylinder injection.Adjust the engines distribution phase places by VVT (variable valve actuator for air) according to different operating modes, improve charging efficiency and realize that internal EGR (exhaust gas recirculation) controls the discharging of NOX.The system that adopts inside and outside mixing to combine can make hydrogen engine operate in preferably under the operating mode.
In conjunction with the accompanying drawings the utility model has been carried out exemplary description above; obviously the utility model specific implementation is not subjected to the restriction of aforesaid way; as long as adopted the improvement of the various unsubstantialities that method of the present utility model design and technological scheme carry out; or design of the present utility model and technological scheme are directly applied to other occasion without improving, all within protection domain of the present utility model.
Claims (8)
1, a kind of hydrogen engine, comprise gas supply system, intake manifold (6), the special-purpose spark plug (13) of CNG and cylinder (10), it is characterized in that: described gas supply system is established gas injector at the end diverse location that enters engine cylinder cover, and hydrogen directly sprays in the cylinder (10) of motor by described gas injector; Perhaps hydrogen by described gas injector intake duct with spray into indirectly in the cylinder (10) of motor after air inlet mixes.
2, according to the described hydrogen engine of claim 1, it is characterized in that: described gas injector comprises external mix gas injector (7) that is used for indirect injection and the internal mix gas injector (12) that is used for direct injection.
3, according to the described hydrogen engine of claim 2, it is characterized in that: described external mix gas injector (7) communicates with described cylinder (10) with the connection mouth of cylinder head (8) by intake manifold (6).
4, according to the described hydrogen engine of claim 2, it is characterized in that: described internal mix gas injector (12) directly communicates with described cylinder (10) by cylinder cap (8), and is positioned at the middle position of the cylinder cap (8) of next-door neighbour's special-purpose spark plug of CNG (13).
5, according to claim 1 or 2 or 3 or 4 described hydrogen engines, it is characterized in that: described gas supply system is provided with in proper order by following flow hydrogen gas: CNG steel cylinder (1), solenoid valve (2), pressure regulator (3), combustion gas spray rail (4), and until gas injector.
6, according to the described hydrogen engine of claim 5, it is characterized in that: described hydrogen engine is established fuel gas injection ECU (Electrical Control Unit) (5), and described fuel gas injection ECU (Electrical Control Unit) (5) is connected with the special-purpose spark plug of solenoid valve (2), pressure regulator (3), external mix gas injector (7), internal mix gas injector (12) and CNG (13) respectively by signal line.
7, according to the described hydrogen engine of claim 6, it is characterized in that: the described signal line that is connected with fuel gas injection ECU (Electrical Control Unit) (5), described signal line comprise the control command signal circuit that working condition signal sends control command to the signal feed back circuit and the fuel gas injection ECU (Electrical Control Unit) (5) of fuel gas injection ECU (Electrical Control Unit) (5) transmission.
8, according to claim 6 or 7 described hydrogen engines, it is characterized in that: described hydrogen engine, its gas distribution system adopts the timing mechanism of changing air valve phase and pulsewidth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820111390XU CN201236754Y (en) | 2007-12-27 | 2008-04-18 | Hydrogen engine |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200720129789 | 2007-12-27 | ||
| CN200720129789.6 | 2007-12-27 | ||
| CNU200820111390XU CN201236754Y (en) | 2007-12-27 | 2008-04-18 | Hydrogen engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201236754Y true CN201236754Y (en) | 2009-05-13 |
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ID=40649494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200820111390XU Expired - Fee Related CN201236754Y (en) | 2007-12-27 | 2008-04-18 | Hydrogen engine |
Country Status (1)
| Country | Link |
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| CN (1) | CN201236754Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101260846B (en) * | 2007-12-27 | 2011-07-13 | 奇瑞汽车股份有限公司 | Hydrogen engines and its burnt gas jet method |
| CN102220921A (en) * | 2010-04-13 | 2011-10-19 | 上海格令汽车电子有限公司 | Integrated gas supply device for gaseous propellant engine system |
| CN108150309A (en) * | 2017-12-22 | 2018-06-12 | 潍柴西港新能源动力有限公司 | The low-pressure fuel gas reutilization system and method for high pressure direct injection gas engine |
-
2008
- 2008-04-18 CN CNU200820111390XU patent/CN201236754Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101260846B (en) * | 2007-12-27 | 2011-07-13 | 奇瑞汽车股份有限公司 | Hydrogen engines and its burnt gas jet method |
| CN102220921A (en) * | 2010-04-13 | 2011-10-19 | 上海格令汽车电子有限公司 | Integrated gas supply device for gaseous propellant engine system |
| CN108150309A (en) * | 2017-12-22 | 2018-06-12 | 潍柴西港新能源动力有限公司 | The low-pressure fuel gas reutilization system and method for high pressure direct injection gas engine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090513 Termination date: 20130418 |