CN107131060B - A method of it is pressed based on dynamic cylinder and determines the engine valve open and close moment - Google Patents
A method of it is pressed based on dynamic cylinder and determines the engine valve open and close moment Download PDFInfo
- Publication number
- CN107131060B CN107131060B CN201710321912.2A CN201710321912A CN107131060B CN 107131060 B CN107131060 B CN 107131060B CN 201710321912 A CN201710321912 A CN 201710321912A CN 107131060 B CN107131060 B CN 107131060B
- Authority
- CN
- China
- Prior art keywords
- engine
- cylinder pressure
- curve
- valve
- cylinder
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0223—Variable control of the intake valves only
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Testing Of Engines (AREA)
Abstract
The present invention provides a kind of method pressed based on dynamic cylinder and determine the engine valve open and close moment, engine in-cylinder pressure is measured in engine stabilizer operational process, then the close moment of valve is judged by cylinder pressure fluctuation, it is compared with existing scheme, the present invention measures the open and close moment of valve during valve actuating mechanism operates normally, it can fully consider the heating expansion of the deformation and effect of inertia and engine temperature of movement components to valve actuating mechanism, obtained valve opening close moment is more accurate effective, has significant progress.
Description
Technical field
The invention belongs to engine design fields, more particularly to when a kind of pressure judgement engine valve unlatching based on dynamic cylinder
The method at quarter.
Background technique
Up to now, engine is still one of most effective dynamic power machine, several especially in power train in vehicle application field
Occupy whole shares.Heat is released in fuel and air combustion reaction in engine, converts to export us by hot merit
The mechanical energy needed.In the process, the supply of fuel can be taking human as adjusting, but air needed for combustion reaction is not every time
Artificially can arbitrarily it increase.So for vehicular engine, circulation air inflow be restrict key factor that power improves it
One.
The raising of circulation air inflow depends on valve timing again.Currently, setting about the engine valve open and close moment
Meter technology comparative maturity.The colleges and universities such as University Of Tianjin, Beijing University of Science & Engineering of external major colleges and universities and research institution and the country
Polytechnics, university etc. has proposed the optimization design design method at engine valve open and close moment.But due to distribution
The thermal expansion and cold contraction effect of mechanism effect of inertia and components, the definite start-up time of valve is but in engine machine real-world operation
It is difficult to determine.
Determine at present the method at engine valve practical open and close moment mainly have one is: pacify on engine flywheel
Index dial is filled, the top dead centre of 0 point of corresponding engine piston on index dial opens the valve-chamber cover of engine, engine is rotated,
The scale value for observing when (or passing through apparatus measures) valve starts mobile and stopping index dial when movement, is started with this
The open and close moment of machine valve.This method is main due to being to measure valve opening close moment under engine static conditions
It has the disadvantage that:
1. having ignored the effect of inertia of the moving parts such as valve in high engine speeds operation process；
2. having ignored the components expanded by heating such as valve in engine operation process extends phenomenon；
3. using index dial it needs to be determined that the top dead centre of engine, engine tope center is difficult to really during actual measurement
It is fixed.
For these reasons, the valve opening close moment of this method measurement misses by a mile.
Summary of the invention
To solve the above problems, the present invention provide it is a kind of when determining the practical unlatching of valve according to cylinder in-cylinder pressure
The new method at quarter measures engine in-cylinder pressure in engine stabilizer operational process, then judges valve by cylinder pressure fluctuation
Close moment, can preferably solve the problems, such as that existing measurement method exists, obtained valve opening close moment is more smart
Truly have effect.
A method of it is pressed based on dynamic cylinder and determines the engine valve open and close moment, comprising the following steps:
Step 1: the distributive value of control engine (2) is zero, and is rotated with dynamometer machine (3) driving engine (2)；Measurement hair
The in-cylinder pressure of motivation (2), and the compression top center of engine (2) is obtained according to in-cylinder pressure；
Step 2: control dynamometer machine (3) stops working, and engine (2) also stops operating；Then control engine (2) starts
Oil spout is simultaneously again started up engine (2), after engine (2) run well, measures the in-cylinder pressure and engine of engine (2)
(2) crank angle, wherein reference zero of the compression top center as crank angle；Based on reference zero, according in this step
The in-cylinder pressure and crank angle of engine (2) obtain in-cylinder pressure curve and cylinder internal pressure when engine (2) run well
Curve of the power about engine (2) cylinder internal volume；
Step 3: rolling average processing is done to in-cylinder pressure curve obtained in step 2, obtain it is smooth after in-cylinder pressure
Curve；
Step 4: with the in-cylinder pressure curve in step 2 subtract in step 3 it is smooth after in-cylinder pressure curve, both obtain
Pressure difference curve；Wherein, the corresponding crank angle of fluctuation maximum point in pressure difference curve during induction stroke is exhaust valve
Close moment, the corresponding crank angle of fluctuation maximum point during compression stroke are the IC Intake Valve Closes moment；
Step 5: the IC Intake Valve Closes moment obtained according to step 4, on the theoretical lifting curve of engine (2) inlet valve
Valve actuating mechanism is found in IC Intake Valve Closes moment corresponding decrement, then in engine (2) inlet valve theory lifting curve
The corresponding crank angle of upper point identical with this decrement height for inlet valve start-up time；
Step 6: the abscissa to the in-cylinder pressure measured in step 2 about the curve of engine (2) cylinder internal volume respectively
And ordinate takes the logarithm with 2 for the truth of a matter, obtains logarithm P-V of the in-cylinder pressure about the curve of engine (2) cylinder internal volume
Figure；
Step 7: extended line being made to the expansion stroke section in logarithm P-V figure obtained in step 6, this extended line and logarithm P-
The burble point of V figure is the start-up time of exhaust valve.
A method of it is pressed based on dynamic cylinder and determines the engine valve open and close moment, in step 2 described in step 3
Obtained in-cylinder pressure curve does rolling average processing method particularly includes:
Using 1 crank angle degrees as section, and section is moved with setting to be spaced in crank angle reference axis, is successively calculated
The average value of all cylinder pressure data points in each section, and using average value as the corresponding pressure of interval midpoint crank angle
Force value, until traverse all sections, obtain it is smooth after in-cylinder pressure curve.
The utility model has the advantages that
The method proposed by the present invention that valve opening close moment is determined according to engine in-cylinder pressure, in engine stabilizer
Engine in-cylinder pressure is measured in operational process, and the close moment and existing scheme phase of valve are then judged by cylinder pressure fluctuation
Than the present invention measures the open and close moment of valve during valve actuating mechanism operates normally, and can fully consider fortune
Heating expansion of the deformation and effect of inertia and engine temperature of dynamic components to valve actuating mechanism, obtained valve
The open and close moment is more accurate effective, has significant progress.
Detailed description of the invention
Fig. 1 is a kind of structural representation that engraving device when determining engine valve open and close is pressed based on dynamic cylinder of the invention
Figure；
Fig. 2 is the in-cylinder pressure curve graph that engine of the invention is measured in not oil spout；
Fig. 3 is the in-cylinder pressure curve graph that the present invention is measured in normal working of engine；
Fig. 4 is inventive engine inlet valve lifting curve；
Fig. 5 is that the curve of cylinder internal volume of the present invention takes the logarithm P-V figure made with 2 logarithm for the truth of a matter；
Fig. 6 is that the present invention schemes partially enlarged figure to the logarithm P-V of Fig. 5；
1- in-cylinder pressure sensor, 2- engine, 3- dynamometer machine, 4- corner brace editing machine, 5- Combustion tester, P- cylinder internal pressure
Power, the difference of Deta-P- in-cylinder pressure P and its moving average, log-P- in-cylinder pressure.
Specific embodiment
With reference to the accompanying drawings and examples, the present invention is described in detail.
Realize that technical scheme is as follows:
There are four ideal operation processes when engine operates: induction stroke, compression stroke, expansion stroke and exhaust punching
Journey.When valve opens and closes under ideal conditions, air-flow smoothly flows into and out cylinder, is not in pressure in cylinder
The phenomenon that power increases suddenly or declines suddenly.But in practical situations valve opening or close when, forcibly change
Air motion in cylinder necessarily causes the mutation of in-cylinder pressure, the pressure wave crest (or trough) of the generation after in-cylinder pressure mutation
It is propagated in cylinder internal reflection, causes in-cylinder pressure sustained oscillation whithin a period of time.The pressure wave is by valve opening or closing
Caused by, at the time of being exactly valve opening at the time of pressure wave occurs or close corresponding.Therefore, by measuring engine cylinder internal pressure
The fluctuation of power, it can be determined that the practical close moment of air intake-exhaust door.(a) after judging the close moment of inlet valve, according to
Total backlash of the available air inlet door drive mechanism of inlet valve theory lifting curve during IC Intake Valve Closes, IO Intake Valve Opens
The stress of air inlet door drive mechanism is similar in closing process in the process, so during the gap is also valve opening
The total backlash of valve actuating mechanism.Conversely, can determine opening for inlet valve in inlet valve theory lifting curve according to the gap
Open the moment.(b) in addition in expansion stroke, before exhaust valve is not turned on, gas in the jar substantially conforms to adiabatic expansion, in logarithm
In P-V figure, adiabatic expansion is a skew lines.After exhaust valve is opened, cylinder is discharged in gas in the jar, and in-cylinder pressure declines,
So when the burble point of actual measurement cylinder crimping and adiabatic expansion Molded Line is exactly the practical unlatching of exhaust valve in logarithm P-V figure
It carves.
As shown in Figure 1, engraving device when being a kind of engine valve open and close determining based on dynamic cylinder pressure of the invention
Structural schematic diagram, including engine 2, dynamometer machine 3, in-cylinder pressure sensor 1, corner brace editing machine 4 and Combustion tester 5.Cylinder
Pressure sensor 1 is mounted on 2 cylinder cap of engine, for measuring the in-cylinder pressure in 2 operation process of engine.Combustion analysis
Instrument 5 is used to receive the signal of in-cylinder pressure sensor 1.The peace of corner brace editing machine 4 turns in 2 flywheel side of engine, is Combustion tester 5
2 corner signal of engine is provided.
A method of it is pressed based on dynamic cylinder and determines the engine valve open and close moment, comprising the following steps:
Step 1: the distributive value of control engine 2 is zero, and drives engine 2 to rotate with dynamometer machine 3；Combustion tester 5
The in-cylinder pressure of the engine 2 measured by in-cylinder pressure sensor 1 is acquired, and the compression of engine 2 is obtained according to in-cylinder pressure
Top dead centre；It is illustrated in figure 2 the in-cylinder pressure curve graph that engine 2 of the invention is measured in not oil spout；
Step 2: control dynamometer machine 3 stops working, and engine (2) also stops operating；Then control engine (2) starts to spray
Oil is simultaneously again started up engine 2, after the normal operation of engine 2, in the cylinder using the measurement engine 2 of in-cylinder pressure sensor 1
Pressure, corner brace editing machine 4 measure the crank angle of engine 2, wherein reference zero of the compression top center as crank angle；Base
In reference zero, Combustion tester 5 obtains engine 2 normally according to the in-cylinder pressure of engine 2 and crank angle in this step
The curve of in-cylinder pressure curve and in-cylinder pressure about 2 cylinder internal volume of engine when operating, wherein compression top center is cylinder
The maximum of points of interior pressure is illustrated in figure 3 the in-cylinder pressure curve graph that engine 2 of the invention is measured when running well；
Step 3: rolling average processing is done to in-cylinder pressure curve obtained in step 2, obtain it is smooth after in-cylinder pressure
Curve；
Step 4: with the in-cylinder pressure curve in step 2 subtract in step 3 it is smooth after in-cylinder pressure curve, both obtain
Pressure difference curve；As shown in figure 3, by taking the pressure oscillation in induction stroke as an example, because when pressure oscillation amplitude originates thus compared with
Greatly, it is then gradually reduced, so this pressure wave is then to propagate in cylinder internal reflection as caused by external disturbance, finally fluctuate energy
Amount exhausts fluctuation and disappears, and in intake stroke, the disturbance source of in-cylinder pressure only one, that is, the unexpected pass of exhaust valve
It closes, therefore the corresponding crank angle of fluctuation maximum point in pressure difference curve during induction stroke is exhaust valve closing moment, pressure
The corresponding crank angle of fluctuation maximum point during contracting stroke is the IC Intake Valve Closes moment；The actual pass of exhaust valve as shown in Figure 3
It closes constantly as -341.7 degree.Similarly, it can determine that the IC Intake Valve Closes moment is -141.2 degree；
Step 5: as shown in figure 4, at the IC Intake Valve Closes moment obtained according to step 4, rise in the theory of 2 inlet valve of engine
Valve actuating mechanism is found on journey curve at IC Intake Valve Closes moment corresponding decrement (A point), then is managed in 2 inlet valve of engine
It is the start-up time of inlet valve by crank angle corresponding with this decrement identical B point of height on lifting curve, it can be with by Fig. 4
Determine that the IO Intake Valve Opens moment is -383 degree；
Step 6: respectively to the in-cylinder pressure measured in step 2 about the curve of 2 cylinder internal volume of engine abscissa with
And ordinate takes the logarithm with 2 for the truth of a matter, obtains the curve of in-cylinder pressure as shown in Figure 5 about engine 2 cylinder internal volume
Logarithm P-V figure；
Step 7: as shown in fig. 6, extended line is made to the expansion stroke section in logarithm P-V figure obtained in step 6, this extension
Line and logarithm P-V figure are in log2Burble point when V=0.5 is the start-up time of exhaust valve, and in log2Engine when V=0.5
Crank angle is 97.3 degree, so the exhauxt valve opens moment is 97.3 degree.
A method of it is pressed based on dynamic cylinder and determines the engine valve open and close moment, in step 2 described in step 3
Obtained in-cylinder pressure curve does rolling average processing method particularly includes:
Using 1 crank angle degrees as section, and section is moved with setting to be spaced in crank angle reference axis, is successively calculated
The average value of all cylinder pressure data points in each section, and using average value as the corresponding pressure of interval midpoint crank angle
Force value, until traverse all sections, obtain it is smooth after in-cylinder pressure curve.
Certainly, the invention may also have other embodiments, without deviating from the spirit and substance of the present invention, ripe
It knows those skilled in the art and makes various corresponding changes and modifications, but these corresponding changes and change in accordance with the present invention
Shape all should fall within the scope of protection of the appended claims of the present invention.
Claims (2)
1. a kind of press the method for determining the engine valve open and close moment based on dynamic cylinder, which is characterized in that including following step
It is rapid:
Step 1: the distributive value of control engine (2) is zero, and is rotated with dynamometer machine (3) driving engine (2)；Measure engine
(2) in-cylinder pressure, and the compression top center of engine (2) is obtained according to in-cylinder pressure；
Step 2: control dynamometer machine (3) stops working, and engine (2) also stops operating；Then engine (2) commencement of fuel injection is controlled
And engine (2) are again started up, after engine (2) run well, measure the in-cylinder pressure and engine (2) of engine (2)
Crank angle, wherein reference zero of the compression top center as crank angle；Based on reference zero, start according in this step
The in-cylinder pressure and crank angle of machine (2) obtain in-cylinder pressure curve and in-cylinder pressure pass when engine (2) run well
In the curve of engine (2) cylinder internal volume；
Step 3: rolling average processing is done to in-cylinder pressure curve obtained in step 2, obtain it is smooth after in-cylinder pressure curve；
Step 4: with the in-cylinder pressure curve in step 2 subtract in step 3 it is smooth after in-cylinder pressure curve, the pressure both obtained
Power difference curve；Wherein, the corresponding crank angle of fluctuation maximum point in pressure difference curve during induction stroke is exhaust valve closing
Moment, the corresponding crank angle of fluctuation maximum point during compression stroke are the IC Intake Valve Closes moment；
Step 5: the IC Intake Valve Closes moment obtained according to step 4 is found on the theoretical lifting curve of engine (2) inlet valve
Valve actuating mechanism in IC Intake Valve Closes moment corresponding decrement, then on engine (2) inlet valve theory lifting curve with
The corresponding crank angle of the identical point of this decrement height is the start-up time of inlet valve；
Step 6: respectively to the in-cylinder pressure measured in step 2 about the abscissa of the curve of engine (2) cylinder internal volume and
Ordinate takes the logarithm with 2 for the truth of a matter, and the logarithm P-V for obtaining in-cylinder pressure about the curve of engine (2) cylinder internal volume schemes；
Step 7: extended line being made to the expansion stroke section in logarithm P-V figure obtained in step 6, this extended line and logarithm P-V figure
Burble point be exhaust valve start-up time.
2. a kind of method for pressing the determining engine valve open and close moment based on dynamic cylinder as described in claim 1, special
Sign is, does rolling average processing to in-cylinder pressure curve obtained in step 2 described in step 3 method particularly includes:
Using 1 crank angle degrees as section, and section is moved with setting to be spaced in crank angle reference axis, is successively calculated each
The average value of all cylinder pressure data points in section, and using average value as the corresponding pressure of interval midpoint crank angle
Value, until traverse all sections, obtain it is smooth after in-cylinder pressure curve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710321912.2A CN107131060B (en) | 2017-05-09 | 2017-05-09 | A method of it is pressed based on dynamic cylinder and determines the engine valve open and close moment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710321912.2A CN107131060B (en) | 2017-05-09 | 2017-05-09 | A method of it is pressed based on dynamic cylinder and determines the engine valve open and close moment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107131060A CN107131060A (en) | 2017-09-05 |
| CN107131060B true CN107131060B (en) | 2019-05-28 |
Family
ID=59731531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710321912.2A Active CN107131060B (en) | 2017-05-09 | 2017-05-09 | A method of it is pressed based on dynamic cylinder and determines the engine valve open and close moment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107131060B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116756621A (en) * | 2023-08-11 | 2023-09-15 | 北京理工大学 | On-line diagnosis method for air inlet and outlet faults of engine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4967711A (en) * | 1988-07-29 | 1990-11-06 | Fuji Jukogyo Kabushiki Kaisha | Fuel injection control system for automotive engine |
| CN1906395A (en) * | 2004-10-07 | 2007-01-31 | 丰田自动车株式会社 | Device and method for controlling internal combustion engine |
| CN101907027A (en) * | 2009-06-08 | 2010-12-08 | 通用汽车环球科技运作公司 | Be used to produce the method and system of in-cylinder pressure sensor signal |
| CN102472196A (en) * | 2010-02-16 | 2012-05-23 | 丰田自动车株式会社 | In-cylinder pressure estimation device for internal combustion engine |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8286471B2 (en) * | 2009-01-13 | 2012-10-16 | Ford Global Technologies, Llc | Variable displacement engine diagnostics |
| US20120324989A1 (en) * | 2011-06-27 | 2012-12-27 | Caterpillar Inc. | System and method for diagnosis of engine component condition |
-
2017
- 2017-05-09 CN CN201710321912.2A patent/CN107131060B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4967711A (en) * | 1988-07-29 | 1990-11-06 | Fuji Jukogyo Kabushiki Kaisha | Fuel injection control system for automotive engine |
| CN1906395A (en) * | 2004-10-07 | 2007-01-31 | 丰田自动车株式会社 | Device and method for controlling internal combustion engine |
| CN101907027A (en) * | 2009-06-08 | 2010-12-08 | 通用汽车环球科技运作公司 | Be used to produce the method and system of in-cylinder pressure sensor signal |
| CN102472196A (en) * | 2010-02-16 | 2012-05-23 | 丰田自动车株式会社 | In-cylinder pressure estimation device for internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107131060A (en) | 2017-09-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Payri et al. | Influence of measurement errors and estimated parameters on combustion diagnosis | |
| Payri et al. | A complete 0D thermodynamic predictive model for direct injection diesel engines | |
| Benajes et al. | A new methodology for uncertainties characterization in combustion diagnosis and thermodynamic modelling | |
| Lapuerta et al. | Sensitivity of diesel engine thermodynamic cycle calculation to measurement errors and estimated parameters | |
| Maroteaux et al. | Diesel engine combustion modeling for hardware in the loop applications: Effects of ignition delay time model | |
| Guo et al. | Research on the operation characteristics of a free-piston linear generator: Numerical model and experimental results | |
| Zhao et al. | An experimental study of the hydraulic free piston engine | |
| Eriksson et al. | Cylinder state estimation from measured cylinder pressure traces-a survey | |
| d’Ambrosio et al. | In-cylinder pressure-based direct techniques and time frequency analysis for combustion diagnostics in IC engines | |
| Maurya et al. | Investigations on the effect of measurement errors on estimated combustion and performance parameters in HCCI combustion engine | |
| CN107727040B (en) | A kind of measurement method and device of valve clearance | |
| Torregrosa et al. | Experimental assessment for instantaneous temperature and heat flux measurements under diesel motored engine conditions | |
| Lapuerta et al. | Study of the compression cycle of a reciprocating engine through the polytropic coefficient | |
| CN107131060B (en) | A method of it is pressed based on dynamic cylinder and determines the engine valve open and close moment | |
| CN102135023B (en) | Method for controlling an engine valve of an internal combustion engine | |
| Finesso et al. | A control-oriented approach to estimate the injected fuel mass on the basis of the measured in-cylinder pressure in multiple injection diesel engines | |
| Zhao et al. | Analysis of excitation source characteristics and their contribution in a 2-cylinder diesel engine | |
| Zhang et al. | Combustion characteristics analysis of hydraulic free piston diesel engine | |
| JP2020521910A (en) | Method for calculating the current compression ratio of an internal combustion engine during operation | |
| Giakoumis | Lubricating oil effects on the transient performance of a turbocharged diesel engine | |
| Hunicz et al. | An analytical approach to converting vibration signal to combustion characteristics of homogeneous charge compression ignition engines | |
| Kouremenos et al. | Phasing cylinder pressure to crank angle in a direct injection diesel engine, by simulation of compression curve and elaboration of measured pressure data | |
| WO2017167220A1 (en) | Method and system for calculating atkinson cycle intake amount of internal combustion engine | |
| Langwiesner et al. | Wall Heat Transfer in a Multi-Link Extended Expansion SI-Engine | |
| Fairbrother et al. | Accurate gas exchange and combustion analysis directly at the test bed |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Li Yijie Inventor after: Shi Zhongjie Inventor after: Liu Fushui Inventor after: Kang Ning Inventor after: Yang Ziming Inventor before: Liu Fushui Inventor before: Shi Zhongjie Inventor before: Li Yijie Inventor before: Kang Ning Inventor before: Yang Ziming |
|
| CB03 | Change of inventor or designer information |