CN106887056A - Vehicle-mounted black box information record and analysis method, system and electric automobile - Google Patents
Vehicle-mounted black box information record and analysis method, system and electric automobile Download PDFInfo
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- CN106887056A CN106887056A CN201710089482.6A CN201710089482A CN106887056A CN 106887056 A CN106887056 A CN 106887056A CN 201710089482 A CN201710089482 A CN 201710089482A CN 106887056 A CN106887056 A CN 106887056A
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C5/00—Registering or indicating the working of vehicles
- G07C5/08—Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time
- G07C5/0816—Indicating performance data, e.g. occurrence of a malfunction
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C5/00—Registering or indicating the working of vehicles
- G07C5/08—Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time
- G07C5/0841—Registering performance data
- G07C5/085—Registering performance data using electronic data carriers
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Abstract
The invention provides a kind of vehicle-mounted black box information record and analysis method, comprise the following steps：Obtain the working condition information of core component and cache, wherein, when breaking down, the working condition information Store of preset period of time before breaking down；According to the stress state of each core component of working condition information analysis；The working condition information and stress state of the core component are exported to show in real time.Above-mentioned main advantages of the present invention are that principle and function by aircraft black box information record and analyzer introduce New-energy electric vehicle, with reference to the common failure mechanism of vehicle-mounted kernel component and failure mode, collection, storage and analysis real-time working conditions data, renewal is shown by graphic user interface or intelligent terminal in real time, realizes that kernel component is grasped from research and development, Full Vehicle System test, using the whole process in the case of operation and chance failure.
Description
Technical field
The present invention relates to vehicle electronic device, more particularly to a kind of vehicle-mounted black box information record and analysis method and it is
System and electric automobile.
Background technology
, used as national emerging pillar industry, subject span is wide, technical difficulty big for New-energy electric vehicle, successfully promotes new
The application and popularization of energy electric vehicle, to energy-saving and environmental protection, improve air pollution and real economy and manufacturing industry with very big
Impetus.The development of New-energy electric vehicle is also the rare opportunity that Chinese Auto Industry bend is overtaken other vehicles.New energy electric vapour
The kernel component of car includes that big three electric products are battery and BMS (BATTERY MANAGEMENT SYSTEM, battery management
System), motor, automatically controlled and small three electric product be Vehicular charger, DC/DC converters and high voltage distribution box.But, with country
Subsidy policy with local government is implemented, and the industry development of New-energy electric vehicle faces random office, and a main problem is exactly
The reliability and safety issue of New-energy electric vehicle.The reliability and injures and deaths security of electric automobile are how improved, is reduced
And avoid the particularly important research topic that the person and property loss are New-energy electric vehicle industries.
The current New-energy electric vehicle kernel component localization rate of parts and components is very high, but the product development thinking of producer and emphasis
Or with meet GB, professional standard and vehicle factory test and application demand based on, the quality improving of kernel component product,
The lifting of particularly reliability and security is made slow progress.It is embedded that there is the functions such as on-line checking, record, analysis and fault diagnosis
Black box information record and analyzer there is earthshaking meaning, but the field basic blank both at home and abroad, have no related
The information announcing and report of technology.
The content of the invention
Present invention aim at the vehicle-mounted black box for providing the functions such as a kind of on-line checking, record, analysis and fault diagnosis
Information record and analysis method and system.
The invention provides a kind of vehicle-mounted black box information record and analysis method, comprise the following steps：
Obtain the working condition information of core component and cache, wherein, when breaking down, when being preset before breaking down
The working condition information Store of section；
According to the stress state of each core component of working condition information analysis；
The working condition information and stress state of the core component are exported to show in real time.
Present invention also offers a kind of vehicle-mounted black box information record and analysis system, including：
Acquisition module, for obtaining the working condition information of core component and caching, wherein, when breaking down, will send out
The working condition information Store of preset period of time before raw failure；
Analysis module, for the stress state according to each core component of working condition information analysis；
Output module, for exporting to show the working condition information and stress state of the core component in real time.
Present invention also offers a kind of electric automobile, including above-mentioned vehicle-mounted black box information record and analysis system.
Main advantages of the present invention are that principle and function by aircraft black box information record and analyzer introduce new energy
Source electric car, with reference to the common failure mechanism of vehicle-mounted kernel component and failure mode, collection, storage and analysis real-time working
Condition data, renewal is shown by graphic user interface or intelligent terminal in real time, realizes kernel component from research and development, Full Vehicle System
Test, use the whole process in the case of operation and chance failure to grasp.Finally consumer is given up to doubt electric automobile safety problem
Consider, set up trust and confidence of the consumer to electric automobile, promote the sustainable health development of electric automobile.
Brief description of the drawings
Fig. 1 is the flow chart of vehicle-mounted black box information record and analysis method in present pre-ferred embodiments；
Fig. 2 is the module diagram of embedded black box information record and analyzer in present pre-ferred embodiments；
Fig. 3 is the flow chart of system testing in present pre-ferred embodiments；
Fig. 4 is the circuit theory diagrams of the excess temperature error injection of system testing in present pre-ferred embodiments；
Fig. 5 is the corresponding table of typical fan control signal and actual speed；
Fig. 6 is normallized current transfer ratio and temperature oscillogram；
Fig. 7 is normallized current transfer ratio and drive current waveform figure；
Fig. 8 is input voltage histogram in the display mode of present pre-ferred embodiments；
The schematic diagram of Fig. 9 circular buffers；
The oscillogram of the data storage of Figure 10 circular buffers；
Figure 11 is 100ms input voltage waveform figures before failure generation in the display mode of present pre-ferred embodiments；
Figure 12 is the timing diagram of 100ms status words before failure generation in the display mode of present pre-ferred embodiments；
Figure 13 is summary information form in the display mode of present pre-ferred embodiments；
Figure 14 is the vehicle-mounted black box information record of present pre-ferred embodiments and the module diagram of analysis system.
Specific embodiment
In order that the technical problem to be solved in the present invention, technical scheme and beneficial effect become more apparent, below in conjunction with
Drawings and Examples, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used
To explain the present invention, it is not intended to limit the present invention.
Fig. 1 is referred to, the vehicle-mounted black box information record and analysis method in present pre-ferred embodiments include following step
Suddenly：
Step S110, obtains the working condition information of core component and caches, wherein, when breaking down, event will occur
The working condition information Store of preset period of time before barrier.
In one embodiment, as a example by the Vehicular charger of embedding information record and analytic function, with reference to Fig. 2, insertion is black
The controller of case information record and analytic function is converted with PFC (Power Factor Correction, PFC)
Device, isolation DC/DC converters, corresponding DSP (Digital Signal Processing, Digital Signal Processing) control section
Electrically connect to obtain the working condition information of the core component in electric machine control system.Wherein, core component such as internal fan, micro-
The key componentses such as controller, optocoupler, electrochemical capacitor.Working condition information include input voltage, input current, input power,
Output voltage, output current, power output and internal temperature etc..When critical failure occurs, when black box subrecord failure occurs
Working condition, there is provided the necessary technical information of failure analysis, accelerate the basic reason that breaks down of identification, propose product design
Perfect scheme.The controller of embedded black box information record and analytic function can be MCU (Micro Controller Unit,
Micro-control unit), such as single-chip microcomputer；Can also be DSP or CPU (Central Processing Unit, central processing unit).
Step S120, according to the stress state of each core component of working condition information analysis.
When vehicle is used, the key componentses such as kernel component internal fan, optocoupler, electrochemical capacitor are gathered and analyzed
The stress state stress state of each core component of working condition information analysis, corresponding core part is judged according to the stress state
Performance state, anticipation failure, performance degradation or end-of-life, and offer safeguard reference information accordingly.M R etc.
Reference information can first be preset in systems.
Step S130, the working condition information and stress state of the core component are exported to show in real time.
By the working condition information and stress state of the core component output in real time to vehicle-mounted graphic user interface
The interface of (Graphic User Interface, GUI) and mobile phone A PP, allows driver and user to understand electric automobile core at any time
The operation conditions of parts.Further, big data analysis can also understand the driving habit of driver, allow kernel component work
Make more " intelligence " and efficient.
More specifically, Vehicular charger, DC/DC converters etc. can only report real-time running data by CAN at present,
And the passing data in its life cycle cannot be provided.After failure occurs, engineering staff is difficult the building ring according to parts
Environment information differentiates quality problem.Performing the flight data recorder information record and analyzer of this method can constantly collect and record core zero
Statistics during part normal work, including input voltage, electric current, power；Output voltage, electric current, power；Temperature, fan
Rotating speed etc., for assessing the stress state of core component, and recognizes quality problem.Statistics in flight data recorder can pass through
CAN, I2C buses or RS485 buses etc. read out, and with histogram, wave sequence figure, timing diagram or collect form
Form shows on vehicle-mounted graphic user interface, intelligent terminal and computer.
In addition, traditional vehicle-mounted computer is after kernel component breaks down, before engineering staff cannot obtain failure generation
A series of key waveforms, failure analysis often based on conjecture, and can only lack positive evidence for recognizing failure mode.This is black
Cassette information is recorded and analyzer can continuous high-speed sampling (sample frequency>=1KHz) kernel component key node operation number
According to including input voltage, input current, output voltage, output current, temperature etc., and it is slow that annular is stored in the form of data flow
Rush in device.Circular buffer has fixed record time span, upon recording between exceed circular buffer length it is stylish
Data can cover old data.When failures are detected, circular buffer stops sampling and storing data into non-volatile depositing
In reservoir, therefore circular buffer is always to maintain failure generation data for the previous period.By vehicle-mounted graphic user interface and/
Or intelligent terminal, these data can be read and be shown in the form of oscillogram.
In more detailed embodiment, this method can carry out system testing, refer to Fig. 3, specifically, including following step
Suddenly：
Step S210, faulting instruction is injected to the core component.One physical fault of injection is instructed by direct fault location
Signal, work performance of the simulation real system when failure occurs.
Step S220, obtains the core component and is performing the working condition information of faulting instruction.By taking fan as an example, for adopting
With the kernel component of air blast cooling, the life-span of fan is often the bottleneck of machine life.Meanwhile, the use environment of automobile is various
Change, including extremely tremble with fear and high temperature, drying and humidity, muddy water and exotic pollution etc. so that fan failure takes place frequently, cause vehicle because
Fan failure stagnation of movement.Black box can periodically inject a rotation speed of the fan control signal, and read actual rotation speed of the fan.
Whether step S230, judge the working condition information in the corresponding working condition range of information of the faulting instruction
It is interior, according to the stress state for judging structure decision core component.If the rotation speed of the fan for reading is not within specified interval, substantially
May determine that fan work is abnormal, it may be possible to be obstructed in air channel, it is also possible to fan in itself mechanically or electrically failure, it is necessary to notify
User checks or changes fan.
The general principle of system testing direct fault location is, when DSP receives faulting instruction, by the sampling of internal sensor
Value replaces with a sampled value that can trigger mistake by force.Fig. 4 is excess temperature fault injection schematic diagram.As illustrated, DSP
ADC (analog-digital converter) constantly samples temperature sensor temperature value, and after filtering process after access hysteresis comparator, and
By producing overheat protector signal after delayer.When temperature fault injection instruction is received, DSP accesses the input of wave filter
One fixed Temperature Quantity eventually passes through filtering, compares and time delay for the output valve of analog temperature temperature sensor when too high
OTP (Over Temperature Protection, overheat protector) signal will be produced to be used for notifying DC/DC converters to close afterwards
Output is closed to prevent core devices from being damaged because of excess temperature.Because mistake be from source injection, temperature signal pass through filtering, compare
It is completely the same etc. subsequent logic and truth, therefore the mistake of injection can truly reflect table of the product when mistake occurs
It is existing, including sequential etc..
By taking fan as an example, when fan failure detection is carried out, black box can periodically inject a control signal, and read reality
Border rotation speed of the fan.If the rotation speed of the fan for reading within specified interval, not may determine that fan work is abnormal substantially, may
That air channel is obstructed, it is also possible to fan in itself mechanically or electrically failure, it is necessary to notify user check or change fan.Fig. 5 is
One example, if to the dutycycle of fan control signal 55%, the rotating speed of reading should be within 5300RPM, error 10%；
If the rotation speed of the fan for reading exceedes the scope, may determine that fan has failure or life expectancy declines, it is necessary in time substantially
Safeguard or change.
The life prediction of optocoupler uses current transfer ratio (Current Transfer Ratio, CTR) scope judgment component
Working condition and service life.By taking the TCLT100 series optocouplers of Vishay as an example, refering to Fig. 6 and Fig. 7, driven in given primary side
In the case of streaming current and temperature, corresponding secondary current can be calculated according to normallized current transfer ratio；Impressed current is adopted
Whether sample circuit, can go out secondary current in working range with on-line checking.If being less than rated value lower limit, it can be determined that optocoupler
Close to end of life, it is necessary to change optocoupler or change whole kernel component.
In more specifically implementation method, step S130 is defeated by the working condition information and stress state of the core component
Go out to vehicle-mounted graphic user interface and/or intelligent terminal, wherein, display mode include histogram, wave sequence figure, timing diagram and
Collect form.
Histogram data type is used to collect the statistic gathering and display during kernel component normal work, including temperature
Degree, input voltage, power output, rotation speed of the fan etc., for assessing the stress of core component, and recognize quality problem.Fig. 8 is
One simple case, for indicating statistics of the Vehicular charger input voltage in its life cycle.Each in figure
Post bar can be reflected always by the binary number representation of 32, the speed refreshed once according to each second, each block diagram
The log of totally 136 years.8 post bars are included in each block diagram, for representing operation operating temperature, power output, work
8 operation intervals in the range of voltage and rotation speed of the fan.By this figure, engineering staff can grasp product in passing all working
The distribution situation of interior input voltage, to assess core devices stress and expected life etc..
Wave sequence type is used to record some the key waveforms information of Vehicular charger before failure generation.Work as charger
When in running order, as shown in Figures 9 and 10, sensor sample data is continuously recorded the (ring in some circular buffers
Buffer), including input voltage, input current, output voltage, output current etc..In general, sample frequency is 1KHz, ring
The depth of shape buffer is 100 hits, therefore the record time of circular buffer is 100ms, the number stylish more than 100ms
According to legacy data can be covered.When failures are detected, circular buffer stops sampling and storing data into nonvolatile memory
In, therefore circular buffer is always to maintain the data of 100ms before failure occurs.After failure occurs, engineering staff can be by CAN
Bus reads black box subdata, and is shown on Vehicular display device or computer in the form of waveform, as shown in figure 11.By this
Intuitively waveform, engineering staff can quick orientation problem basic reason.
Status word sequential graph type is used to record Vehicular charger status word information in failure generation for the previous period, with
Wave sequence type be similar to, status data be also be stored in buffer circle and mistake occur when be latched, but with waveform sequence
Row type is different, and what it showed on GUI is not analog waveform, but a digital time-state method.As shown in figure 12,
Each situation of change in 100ms before failure generation in charger in a status word is shown in figure.By these
State diagram, engineering staff open-and-shut can obtain charger internal state change situation for occurring before breaking down, pair event
The barrier analysis of causes can play very big help.
Summary information form is a data type for 16 bit lengths, for storing some summed signals and other debugging letters
Breath, such as the information such as switching on and shutting down number of times, mistake frequency is helped for assistant adjustment.Summary information is on GUI directly with number
The mode of value shows, as shown in figure 13.
Refer to Figure 14, vehicle-mounted black box information record and analysis system include acquisition module 110, analysis module 120, defeated
Go out module 130, direct fault location module 140 and judge module 150.
Acquisition module 110 is used to obtain the working condition information of core component and cache, wherein, when breaking down, will
The working condition information Store of preset period of time before breaking down；Analysis module 120 is used for according to the working condition information
Analyze the stress state of each core component；Output module 130 is used for the working condition information and stress shape of the core component
State exports to show in real time.
Direct fault location module 140 is used to export faulting instruction to the core component；The acquisition module 110 is additionally operable to obtain
Take the core component and perform the working condition information of faulting instruction；Judge module 150, for judging that the working condition information is
It is no in the corresponding working condition range of information of the faulting instruction, according to the stress state for judging structure decision core component.
The judge module 150 is additionally operable to judge according to the stress state performance state of corresponding core part, and carries
For safeguarding reference information accordingly.
The output module 130 uses working condition information and the stress state output of the core component to vehicle-mounted figure
Family interface and/or intelligent terminal, wherein, display mode includes histogram, wave sequence figure, timing diagram and collects form.
Additionally, additionally providing a kind of electric automobile including above-mentioned vehicle-mounted black box information record and analysis system.
The beneficial effect of embedded black box information record and analysis system and method at least includes：
1st, continuous acquisition and practical working situation is recorded, including input voltage, electric current, power, output voltage, electric current, work(
Rate, internal temperature, and over-pressed, the under-voltage, excessively stream that is likely to occur, short circuit, overheat protector, input are lost and fan failure etc..
2nd, when critical failure occurs, working condition when black box subrecord failure occurs, there is provided failure analysis is necessary
Technical information, accelerates the basic reason that identification is broken down, and proposes product design perfect scheme.
3rd, when vehicle is used, gather and analyze the key componentses such as kernel component internal fan, optocoupler, electrochemical capacitor
Stress parameters, anticipation failure, performance degradation or end-of-life, there is provided the reference information such as M R.
4th, vehicle-mounted graphic user interface and intelligent terminal are sent data to, allows driver and user to understand electric automobile at any time
The operation conditions of kernel component；Big data analysis can also understand the driving habit of driver, allow kernel component to work more
Plus it is " intelligence " and efficient.
It is apparent to those skilled in the art that, for convenience of description and succinctly, only with above-mentioned each work(
The division of energy unit is carried out for example, in practical application, as needed can distribute by different functions above-mentioned functions
Unit is completed, will the internal structure of described device be divided into different functional unit or modules, it is described above complete to complete
Portion or partial function.Each functional unit in embodiment can be integrated in a processing unit, or unit
Individually it is physically present, it is also possible to which two or more units are integrated in a unit, above-mentioned integrated unit can both be adopted
Realized with the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.In addition, the specific name of each functional unit
Only to facilitate mutually distinguishing, the protection domain of the application is not limited to.The specific works mistake of unit in said apparatus
Journey, may be referred to the corresponding process in preceding method embodiment, will not be repeated here.
Those of ordinary skill in the art are it is to be appreciated that the list of each example described with reference to the embodiments described herein
Unit and algorithm steps, can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
Performed with hardware or software mode, depending on the application-specific and design constraint of technical scheme.Professional and technical personnel
Described function, but this realization can be realized it is not considered that exceeding using distinct methods to each specific application
The scope of the present invention.
In embodiment provided by the present invention, it should be understood that disclosed apparatus and method, can be by other
Mode is realized.For example, device embodiment described above is only schematical, for example, the division of the module or unit,
It is only a kind of division of logic function, there can be other dividing mode when actually realizing, such as multiple units or component can be with
With reference to or be desirably integrated into another system, or some features can be ignored, or not perform.It is another, it is shown or discussed
Coupling each other or direct-coupling or communication connection can be by some interfaces, the INDIRECT COUPLING of device or unit or
Communication connection, can be electrical, mechanical or other forms.
The unit that is illustrated as separating component can be or may not be it is physically separate, it is aobvious as unit
The part for showing can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be according to the actual needs selected to realize the mesh of this embodiment scheme
's.
In addition, during each functional unit in each embodiment of the invention can be integrated in a processing unit, it is also possible to
It is that unit is individually physically present, it is also possible to which two or more units are integrated in a unit.Above-mentioned integrated list
Unit can both be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.
If the integrated unit is to realize in the form of SFU software functional unit and as independent production marketing or use
When, can store in a computer read/write memory medium.Based on such understanding, the technical scheme of the embodiment of the present invention
The part for substantially being contributed to prior art in other words or all or part of the technical scheme can be with software products
Form embody, the computer software product is stored in a storage medium, including some instructions are used to so that one
Computer equipment (can be personal computer, server, or network equipment etc.) or processor (processor) perform this hair
The all or part of step of bright embodiment each embodiment methods described.And foregoing storage medium includes：USB flash disk, mobile hard disk,
Read-only storage (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic
Dish or CD etc. are various can be with the medium of store program codes.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although with reference to foregoing reality
Example is applied to be described in detail the present invention, it will be understood by those within the art that：It still can be to foregoing each
Technical scheme described in embodiment is modified, or carries out equivalent to which part technical characteristic；And these are changed
Or replace, do not make the spirit and model of essence disengaging each embodiment technical scheme of the embodiment of the present invention of appropriate technical solution
Enclose.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of vehicle-mounted black box information record and analysis method, it is characterised in that comprise the following steps：
Obtain the working condition information of core component and cache, wherein, when breaking down, preset period of time before breaking down
The working condition information Store；
According to the stress state of each core component of working condition information analysis；
The working condition information and stress state of the core component are exported to show in real time.
2. the method for claim 1, it is characterised in that also include：
Faulting instruction is injected to the core component；
Obtain the core component and perform the working condition information of faulting instruction；
The working condition information is judged whether in the corresponding working condition range of information of the faulting instruction, according to judging structure
Judge the stress state of core component.
3. method as claimed in claim 1 or 2, it is characterised in that also including judging corresponding core according to the stress state
The performance state of part, and offer safeguards reference information accordingly.
4. the method for claim 1, it is characterised in that the working condition information and stress by the core component
State output in real time with display in, by the working condition information and stress state of the core component output to vehicle-mounted figure use
Family interface and/or intelligent terminal, wherein, display mode includes histogram, wave sequence figure, timing diagram and collects form.
5. the method for claim 1, it is characterised in that the working condition information of the core component includes input electricity
Pressure, input current, input power, output voltage, output current, power output, internal temperature；The failure includes being input into
Pressure, input undervoltage, input excessively stream, input short, input short, temperature are too high, input is lost and fan failure.
6. a kind of vehicle-mounted black box information record and analysis system, it is characterised in that including：
Acquisition module, for obtaining the working condition information of core component and caching, wherein, when breaking down, event will occur
The working condition information Store of preset period of time before barrier；
Analysis module, for the stress state according to each core component of working condition information analysis；
Output module, for exporting to show the working condition information and stress state of the core component in real time.
7. system as claimed in claim 6, it is characterised in that also include：
Direct fault location module, for injecting faulting instruction to the core component；
The acquisition module is additionally operable to obtain working condition information of the core component in execution faulting instruction；
Judge module, for judging the working condition information whether in the corresponding working condition range of information of the faulting instruction
It is interior, according to the stress state for judging structure decision core component.
8. system as claimed in claim 7, it is characterised in that the judge module is additionally operable to be judged according to the stress state
The performance state of corresponding core part, and offer safeguards reference information accordingly.
9. the system as claimed in claim 1, it is characterised in that the output module believes the working condition of the core component
Vehicle-mounted graphic user interface and/or intelligent terminal are arrived in breath and stress state output, wherein, display mode includes histogram, waveform
Sequence chart, timing diagram and collect form.
10. a kind of electric automobile, it is characterised in that including the vehicle-mounted black box information record described in any one of claim 6 to 9
And analysis system.
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| CN108629866A (en) * | 2018-05-07 | 2018-10-09 | 上海海鹰机械厂 | Method is repaiied in the examination of certain type Flight Data Record System for Aircraft |
| CN109442678A (en) * | 2018-10-18 | 2019-03-08 | 珠海格力电器股份有限公司 | Electric control method, system and air-conditioning |
| CN110675525A (en) * | 2019-10-28 | 2020-01-10 | 卧龙电气南阳防爆集团股份有限公司 | Intelligent motor data recorder |
| CN114459373A (en) * | 2022-04-13 | 2022-05-10 | 中交三航局第三工程有限公司 | Intelligent monitoring system of integrated bridge girder erection machine |
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Application publication date: 20170623 |