CN104133696A - Vehicle electronic control unit data flushing method, vehicle electronic control unit data flushing system and memory medium - Google Patents
Vehicle electronic control unit data flushing method, vehicle electronic control unit data flushing system and memory medium Download PDFInfo
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- CN104133696A CN104133696A CN201410341166.XA CN201410341166A CN104133696A CN 104133696 A CN104133696 A CN 104133696A CN 201410341166 A CN201410341166 A CN 201410341166A CN 104133696 A CN104133696 A CN 104133696A
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Abstract
The embodiment of the invention discloses a vehicle electronic control unit data flushing method, which comprises the following steps that: the identity authentication information of a user is obtained; a special-purpose file system judges whether the obtained identity authentication information is consistent with the prestored identity authentication information or not; and if so, vehicle electronic control unit data flushing software is allowed to call a flushing authority control file in the special-purpose file system for carrying out flushing on data of an electronic control unit. The embodiment of the invention also discloses a memory medium and a vehicle electronic control unit data flushing system. According to the embodiment of the invention, the potential safety hazard caused on a vehicle since any person can freely call the flushing authority control file for flushing in the prior art is avoided, and the safety of the vehicle is improved.
Description
Technical field
The present invention relates to automotive field, relate in particular to a kind of Car Electronic Control cell data and write with a brush dipped in Chinese ink method and system and storage medium.
Background technology
Electronic control unit (Electronic Control Unit is called for short ECU), claims again " car running computer ", " vehicle-mounted computer " etc., is the dedicated microcomputer controller using on automobile or engine, is also called automobile specified single-chip microcomputer.It is the same with common single-chip microcomputer, is made up of large scale integrated circuits such as microprocessor (CUP), storer (ROM, RAM), input/output interface (I/O), analog to digital converter (A/D) and drivings.The function of electronic control unit is, according to the program of its internal memory and data, the information of various sensor inputs is carried out to computing, processing and judgement, then output order, controlling execution unit operation, diagnose and record execution unit fault, obtain execution unit running status etc.
While test before vehicle is dispatched from the factory, often need to write with a brush dipped in Chinese ink the data of Car Electronic Control unit, so that vehicle can reach optimum condition in motion.Or in order to meet the emission standard of national regulation, also can be by the data of ECU being write with a brush dipped in Chinese ink to reach the object that reduces oil consumption, reduces discharge after vehicle dispatches from the factory.Prior art is connected computing machine with described Car Electronic Control unit, what computing machine called electronic control unit writes with a brush dipped in Chinese ink control of authority file, then writes with a brush dipped in Chinese ink software by data amended data are loaded into electronic control unit.In this process, writing with a brush dipped in Chinese ink control of authority file is stored in standard file system, computing machine can directly read or store, as long as write with a brush dipped in Chinese ink control of authority file and data that the consequence that this mode causes is for anyone has an electronic control unit are write with a brush dipped in Chinese ink professional software and just can be carried out data and write with a brush dipped in Chinese ink, thereby vehicle safety is caused a hidden trouble.
Summary of the invention
In order to solve prior art because the control of authority file of electronic control unit is stored in the vehicle safety hidden danger causing in standard file system, the embodiment of the present invention provides a kind of Car Electronic Control cell data to write with a brush dipped in Chinese ink method and system, and a kind of storage medium, having realized the talent who only has an authority can write with a brush dipped in Chinese ink electronic control unit data, thereby eliminates the potential safety hazard of vehicle.
The embodiment of the present invention provides a kind of Car Electronic Control cell data to write with a brush dipped in Chinese ink method, and described method comprises:
Obtain user's authentication information;
Dedicated file system judges that whether described authentication information is consistent with the authentication information prestoring;
If so, allowing electronic control unit data to write with a brush dipped in Chinese ink the control of authority file of writing with a brush dipped in Chinese ink in dedicated file system described in software transfer writes with a brush dipped in Chinese ink the data of electronic control unit.
Preferably, described dedicated file system is stored in mobile memory medium.
Preferably, described mobile memory medium is specially USB flash disk, portable hard drive and storage card.
Preferably, described dedicated file system is stored in virtual storage medium.
Preferably, described authentication information comprises password, user name, password, seal, smart card and/or biological characteristic.
Preferably, described permission Car Electronic Control cell data is write with a brush dipped in Chinese ink the control of authority file of writing with a brush dipped in Chinese ink in dedicated file system described in software transfer the data of electronic control unit is write with a brush dipped in Chinese ink and are specially:
The control of authority file of writing with a brush dipped in Chinese ink in described dedicated file system judges that electronic control unit data write with a brush dipped in Chinese ink software and whether mate with electronic control unit;
If so, described electronic control unit data are write with a brush dipped in Chinese ink and are write with a brush dipped in Chinese ink control of authority file described in software transfer the data of electronic control unit are write with a brush dipped in Chinese ink.
Preferably, described method also comprises:
Described dedicated file system is formatted as to standard file system.
The embodiment of the present invention also provides a kind of storage medium, and described storage medium comprises authentication information acquiring unit and authentication information judging unit, wherein,
Described authentication information acquiring unit, for obtaining user's authentication information;
Described authentication information judging unit, for judging that whether described authentication information is consistent with the authentication information prestoring, if so, allowing electronic control unit data to write with a brush dipped in Chinese ink the control of authority file of writing with a brush dipped in Chinese ink in storage medium described in software transfer writes with a brush dipped in Chinese ink the data of electronic control unit.
Preferably, described storage medium also comprises formatting unit, for by the file system format of described storage medium.
The embodiment of the present invention also provides a kind of Car Electronic Control cell data to write with a brush dipped in Chinese ink system, and described system comprises: electronic control unit and mobile memory medium, wherein,
Described mobile memory medium, for obtaining user's authentication information, and judge that whether described authentication information is consistent with the authentication information prestoring, if so, allowing Car Electronic Control cell data to write with a brush dipped in Chinese ink the control of authority file of writing with a brush dipped in Chinese ink in mobile memory medium described in software transfer writes with a brush dipped in Chinese ink the data of described electronic control unit.
Compared with prior art, the present invention has the following advantages:
Standard file system is converted into dedicated file system by the present invention, user call in dedicated file system write with a brush dipped in Chinese ink control of authority file before need to carry out authentication, if by described authentication, just being allowed through electronic control unit data writes with a brush dipped in Chinese ink software and writes with a brush dipped in Chinese ink control of authority file described in calling the data of electronic control unit are write with a brush dipped in Chinese ink, anyone can arbitrarily call the technological deficiency of writing with a brush dipped in Chinese ink control of authority file and cause producing vehicle safety hidden danger from standard file system to have overcome prior art, has promoted vehicle safety.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, the accompanying drawing the following describes is only some embodiment that record in the application, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the process flow diagram that a kind of Car Electronic Control cell data provided by the invention is write with a brush dipped in Chinese ink embodiment of the method one;
Fig. 2 is the process flow diagram that a kind of Car Electronic Control cell data provided by the invention is write with a brush dipped in Chinese ink embodiment of the method two;
Fig. 3 is the structured flowchart of a kind of storage medium device embodiment provided by the invention;
Fig. 4 is the structured flowchart that a kind of Car Electronic Control cell data provided by the invention is write with a brush dipped in Chinese ink system embodiment.
Embodiment
In order to make those skilled in the art person understand better the present invention program, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment of the method one:
Electronic control unit ECU is the core component of motor car engine, carries out car load test before automobile dispatches from the factory, and often carries out electronic control unit data and writes with a brush dipped in Chinese ink, and makes vehicle reach default optimal performance.Write with a brush dipped in Chinese ink in process at ECU, need to load and write with a brush dipped in Chinese ink control of authority file, described in write with a brush dipped in Chinese ink control of authority file and conventionally provided by ECU manufacturer, what the ECU of different editions was corresponding different writes with a brush dipped in Chinese ink control of authority file.In prior art, described in write with a brush dipped in Chinese ink in the standard file system that control of authority file is stored in common storage.Described standard file system refers to method and the data structure of file in the clear and definite disk of operating system user or subregion, and common standard file system has FAT, NTFS, exFAT etc.Read that to write with a brush dipped in Chinese ink the process of control of authority file as follows: send the driver of I/O instruction to standard file system; Described driver is resolved I/O instruction, and the I/O instruction after resolving is sent to the disk drive of standard file system, and described disk drive reads described control of authority file from the relevant position of disk.The result that this employing standard file system causes the mode of writing with a brush dipped in Chinese ink control of authority file and storing is: as long as anyone has and writes with a brush dipped in Chinese ink control of authority file and ECU and write with a brush dipped in Chinese ink software and just can write with a brush dipped in Chinese ink the data of automobile ECU, cause serious potential safety hazard.
Referring to Fig. 1, this figure is that a kind of Car Electronic Control cell data provided by the invention is write with a brush dipped in Chinese ink embodiment of the method one schematic diagram.
The technical matters existing in order to solve prior art, the Car Electronic Control cell data that the embodiment of the present invention provides is write with a brush dipped in Chinese ink method and is comprised the steps:
Step 101: the authentication information of obtaining user.
Authentication is the process of confirming operator's identity.Authentication can be divided into the certification of user and equipment room and the certification of equipment and equipment room, the invention belongs to the certification of user and equipment room.The authentication of user and equipment room can be divided into three kinds:
(1) information of knowing according to user proves user's identity, such as password, username and password etc.;
Described password comprises static password and dynamic password, and static password refers to the disposable generation of password, in use immobilizes; Dynamic password refers to the disposal password that has adopted time, time, key ternary and produce, each dynamic password card has unique key, this key is deposited in server end simultaneously, when each certification, dynamic password card and server calculate according to same key, same stray parameter (time, event) and same algorithm the dynamic password authenticating respectively, thus the consistance of guarantee password.
(2) gather around anything according to user and prove user's identity, such as E-seal, smart card etc.;
Smart card is a kind of card of built-in integrated circuit, needs that in use described smart card is inserted to card reader and carrys out reading information.Adopt described smart card identity checking, user's authentication information is PIN code.
(3) prove user's identity according to user's biological characteristic, such as fingerprint, sound, retina etc.
Described biological characteristic authentication is to adopt everyone unique biological characteristic to carry out the technology of identifying user identity, because its direct end user's physical features represents everyone identity, therefore very low by counterfeit possibility.
Described user's ID authentication information can be above any one, can be also two or more combining wherein, the present invention is not specifically limited.In the present embodiment, preferred, users authentication information is username and password.
Step 102: whether unanimously with the authentication information prestoring obtain authentication information described in dedicated file system judgement; If so, carry out step 103.
Described dedicated file system is stored in mobile memory medium, and such as USB flash disk, portable hard drive, storage card etc., also can be stored in virtual storage medium a subregion of for example computer hard disc.
Step 103: allow electronic control unit data to write with a brush dipped in Chinese ink the control of authority file of writing with a brush dipped in Chinese ink in dedicated file system described in software transfer the data of electronic control unit are write with a brush dipped in Chinese ink.
Electronic control unit data are in the market write with a brush dipped in Chinese ink software INCA, DTS570, EPS518 etc., for example, write with a brush dipped in Chinese ink in process in diesel engine ECU data, INCA calls and writes with a brush dipped in Chinese ink control of authority file in described dedicated file system, and add * .HEX data file and * .A2L data declaration file, then the data of diesel engine ECU are write with a brush dipped in Chinese ink.
The present embodiment adopts the dedicated file system that can carry out authentication to replace traditional standard file system to store the described control of authority file of writing with a brush dipped in Chinese ink, described in the talent who only has authority is allowed to call, writing with a brush dipped in Chinese ink control of authority file writes with a brush dipped in Chinese ink the data of Car Electronic Control unit, overcome and in prior art, write with a brush dipped in Chinese ink control of authority file owing to being stored in standard file system and the technological deficiency of arbitrarily being called, eliminated the potential safety hazard of vehicle.
Embodiment of the method two:
Due to the electronic control unit difference of different electronic control unit production firm production, same production firm also can produce the electronic control unit of multiple versions, writes with a brush dipped in Chinese ink so the difference of the present embodiment and embodiment of the method one is to make described electronic control unit data to write with a brush dipped in Chinese ink software the electronic control unit matching.
Referring to Fig. 2, this figure is that a kind of Car Electronic Control cell data provided by the invention is write with a brush dipped in Chinese ink embodiment of the method two schematic diagram.
The Car Electronic Control cell data that the embodiment of the present invention provides is write with a brush dipped in Chinese ink method and is comprised the steps:
Step 201: the authentication information of obtaining user.
Step 202: whether unanimously with the authentication information prestoring obtain authentication information described in dedicated file system judgement; If so, carry out step 203.
Step 203: the control of authority file of writing with a brush dipped in Chinese ink in described dedicated file system judges that electronic control unit data write with a brush dipped in Chinese ink software and whether mate with electronic control unit, if so, carry out step 204.
Step 204: described electronic control unit data are write with a brush dipped in Chinese ink and write with a brush dipped in Chinese ink control of authority file described in software transfer the data of electronic control unit are write with a brush dipped in Chinese ink.
The present embodiment makes described electronic control unit data write with a brush dipped in Chinese ink software and writes with a brush dipped in Chinese ink the electronic control unit matching, and avoids occurring brushing phenomenon by mistake.
In the time that described dedicated file system is not used further to electronic control unit data and writes with a brush dipped in Chinese ink, preferred, described method also comprises the steps:
Described dedicated file system is formatted as to standard file system.
So-called format refers to carries out initialized a kind of operation to file system; this operation can cause the file in original file system to be eliminated conventionally; so the standard file system after format can arbitrarily be read and store; use as common storage medium, improve the utilization factor of resource.
A kind of Car Electronic Control cell data providing based on above embodiment is write with a brush dipped in Chinese ink method, and the embodiment of the present invention also provides a kind of storage medium, describes its principle of work in detail below in conjunction with accompanying drawing.
Device embodiment:
Referring to Fig. 3, this figure is a kind of storage medium embodiment schematic diagram provided by the invention.
The storage medium that the embodiment of the present invention provides comprises authentication information acquiring unit 301 and authentication information judging unit 302.
Wherein, described authentication information acquiring unit 301, for obtaining user's authentication information; Described authentication information judging unit 302, for judging that whether described authentication information is consistent with the authentication information prestoring, if so, allowing electronic control unit data to write with a brush dipped in Chinese ink the control of authority file of writing with a brush dipped in Chinese ink in storage medium described in software transfer writes with a brush dipped in Chinese ink the data of electronic control unit.
Wherein, whether the described control of authority file of writing with a brush dipped in Chinese ink is write with a brush dipped in Chinese ink software and is mated with described electronic control unit for judging described electronic control unit data, if so, described electronic control unit data are write with a brush dipped in Chinese ink and are write with a brush dipped in Chinese ink control of authority file described in software transfer the data of described electronic control unit are write with a brush dipped in Chinese ink.
In actual applications, described storage medium can be mobile memory medium, and such as USB flash disk, portable hard drive, storage card etc., can be also virtual storage medium, for example a certain subregion in computer hard disc.
The present embodiment provides a kind of storage medium, in described storage medium, described in storage, write with a brush dipped in Chinese ink control of authority file, by user identity is verified, the talent who makes to have authority can be write with a brush dipped in Chinese ink described in software transfer and be write with a brush dipped in Chinese ink control of authority file by described electronic control unit data, thereby described electronic control unit is write with a brush dipped in Chinese ink, anyone writes with a brush dipped in Chinese ink that control of authority file is write with a brush dipped in Chinese ink described in can arbitrarily calling and potential safety hazard that vehicle is caused to have overcome prior art, the security that has improved vehicle.
In the time that the dedicated file system in described storage medium is no longer used, preferred, described storage medium also comprises formatting unit, for the dedicated file system of described storage medium is formatted as to standard file system.When dedicated file system becomes after standard file system, just can arbitrarily be read and be stored, improve the utilization factor of resource.
A kind of Car Electronic Control cell data providing based on above embodiment is write with a brush dipped in Chinese ink method and a kind of storage medium, and the embodiment of the present invention also provides a kind of Car Electronic Control cell data to write with a brush dipped in Chinese ink system, describes its principle of work in detail below in conjunction with accompanying drawing.
System embodiment:
Referring to Fig. 4, this figure is that a kind of Car Electronic Control cell data provided by the invention is write with a brush dipped in Chinese ink system embodiment schematic diagram.
The Car Electronic Control cell data that the present embodiment provides is write with a brush dipped in Chinese ink system and is comprised: electronic control unit 401 and mobile memory medium 402.
Wherein, described mobile memory medium 402, for obtaining user's authentication information, and whether the authentication information of obtaining described in judgement is consistent with the authentication information prestoring, if so, allowing Car Electronic Control cell data to write with a brush dipped in Chinese ink the control of authority file of writing with a brush dipped in Chinese ink in mobile memory medium described in software transfer writes with a brush dipped in Chinese ink the data of described electronic control unit.
Wherein, whether the described control of authority file of writing with a brush dipped in Chinese ink is write with a brush dipped in Chinese ink software and is mated with described electronic control unit for judging described electronic control unit data, if so, described electronic control unit data are write with a brush dipped in Chinese ink and are write with a brush dipped in Chinese ink control of authority file described in software transfer the data of described electronic control unit are write with a brush dipped in Chinese ink.
In actual applications, described mobile memory medium can be USB flash disk, portable hard drive or storage card etc., and the present invention is not specifically limited.
A kind of Car Electronic Control cell data that the present embodiment provides is write with a brush dipped in Chinese ink system by adopting described mobile memory medium 402 to verify user identity, the talent who makes to have authority can be write with a brush dipped in Chinese ink described in software transfer and be write with a brush dipped in Chinese ink control of authority file by described electronic control unit data, thereby described electronic control unit is write with a brush dipped in Chinese ink, anyone writes with a brush dipped in Chinese ink that control of authority file is write with a brush dipped in Chinese ink described in can arbitrarily calling and potential safety hazard that vehicle is caused to have overcome prior art, the security that has improved vehicle.
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually referring to, what each embodiment stressed is and the difference of other embodiment.Especially,, for system embodiment, because it is substantially similar in appearance to device embodiment, so describe fairly simplely, relevant part is referring to the part explanation of embodiment of the method.Device embodiment described above is only schematically, and wherein said unit and module as separating component explanation can or can not be also physically to separate.In addition, can also select according to the actual needs some or all of unit wherein and module to realize the object of the present embodiment scheme.Those of ordinary skill in the art, in the situation that not paying creative work, are appreciated that and implement.
The above is only the specific embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. Car Electronic Control cell data is write with a brush dipped in Chinese ink a method, it is characterized in that, described method comprises:
Obtain user's authentication information;
Dedicated file system judges that whether described authentication information is consistent with the authentication information prestoring;
If so, allowing electronic control unit data to write with a brush dipped in Chinese ink the control of authority file of writing with a brush dipped in Chinese ink in dedicated file system described in software transfer writes with a brush dipped in Chinese ink the data of electronic control unit.
2. Car Electronic Control cell data according to claim 1 is write with a brush dipped in Chinese ink method, it is characterized in that, described dedicated file system is stored in mobile memory medium.
3. Car Electronic Control cell data according to claim 2 is write with a brush dipped in Chinese ink method, it is characterized in that, described mobile memory medium is specially USB flash disk, portable hard drive and storage card.
4. Car Electronic Control cell data according to claim 1 is write with a brush dipped in Chinese ink method, it is characterized in that, described dedicated file system is stored in virtual storage medium.
5. Car Electronic Control cell data according to claim 1 is write with a brush dipped in Chinese ink method, it is characterized in that, described authentication information comprises password, user name, password, seal, smart card and/or biological characteristic.
6. Car Electronic Control cell data according to claim 1 is write with a brush dipped in Chinese ink method, it is characterized in that, described permission Car Electronic Control cell data is write with a brush dipped in Chinese ink the control of authority file of writing with a brush dipped in Chinese ink in dedicated file system described in software transfer the data of electronic control unit is write with a brush dipped in Chinese ink and are specially:
The control of authority file of writing with a brush dipped in Chinese ink in described dedicated file system judges that electronic control unit data write with a brush dipped in Chinese ink software and whether mate with electronic control unit;
If so, described electronic control unit data are write with a brush dipped in Chinese ink and are write with a brush dipped in Chinese ink control of authority file described in software transfer the data of electronic control unit are write with a brush dipped in Chinese ink.
7. write with a brush dipped in Chinese ink method according to the Car Electronic Control cell data described in claim 1 to 6 any one, it is characterized in that, described method also comprises:
Described dedicated file system is formatted as to standard file system.
8. a storage medium, is characterized in that, described storage medium comprises authentication information acquiring unit and authentication information judging unit, wherein,
Described authentication information acquiring unit, for obtaining user's authentication information;
Described authentication information judging unit, for judging that whether described authentication information is consistent with the authentication information prestoring, if so, allowing electronic control unit data to write with a brush dipped in Chinese ink the control of authority file of writing with a brush dipped in Chinese ink in storage medium described in software transfer writes with a brush dipped in Chinese ink the data of electronic control unit.
9. storage medium according to claim 8, is characterized in that, described storage medium also comprises formatting unit, for by the file system format of described storage medium.
10. Car Electronic Control cell data is write with a brush dipped in Chinese ink a system, it is characterized in that, described system comprises: electronic control unit and mobile memory medium, wherein,
Described mobile memory medium, for obtaining user's authentication information, and judge that whether described authentication information is consistent with the authentication information prestoring, if so, allowing Car Electronic Control cell data to write with a brush dipped in Chinese ink the control of authority file of writing with a brush dipped in Chinese ink in mobile memory medium described in software transfer writes with a brush dipped in Chinese ink the data of described electronic control unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410341166.XA CN104133696A (en) | 2014-07-17 | 2014-07-17 | Vehicle electronic control unit data flushing method, vehicle electronic control unit data flushing system and memory medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410341166.XA CN104133696A (en) | 2014-07-17 | 2014-07-17 | Vehicle electronic control unit data flushing method, vehicle electronic control unit data flushing system and memory medium |
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| CN201410341166.XA Pending CN104133696A (en) | 2014-07-17 | 2014-07-17 | Vehicle electronic control unit data flushing method, vehicle electronic control unit data flushing system and memory medium |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105488376A (en) * | 2015-12-01 | 2016-04-13 | 北京中微锐芯科技有限公司 | Identity determination method and device |
| CN105799620A (en) * | 2014-12-29 | 2016-07-27 | 上海通用汽车有限公司 | Security code calculation of a vehicle electronic control module |
| CN106372551A (en) * | 2016-08-26 | 2017-02-01 | 安徽全柴动力股份有限公司 | Error-proof ECU data brush-writing method and device |
| CN113920600A (en) * | 2020-07-10 | 2022-01-11 | 霍致文 | Writing method and device |
-
2014
- 2014-07-17 CN CN201410341166.XA patent/CN104133696A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105799620A (en) * | 2014-12-29 | 2016-07-27 | 上海通用汽车有限公司 | Security code calculation of a vehicle electronic control module |
| CN105799620B (en) * | 2014-12-29 | 2019-01-22 | 上海通用汽车有限公司 | The security code of vehicle electric control module calculates |
| CN105488376A (en) * | 2015-12-01 | 2016-04-13 | 北京中微锐芯科技有限公司 | Identity determination method and device |
| CN105488376B (en) * | 2015-12-01 | 2018-08-07 | 北京中微锐芯科技有限公司 | Determine the method and device of identity |
| CN106372551A (en) * | 2016-08-26 | 2017-02-01 | 安徽全柴动力股份有限公司 | Error-proof ECU data brush-writing method and device |
| CN113920600A (en) * | 2020-07-10 | 2022-01-11 | 霍致文 | Writing method and device |
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