CN106762771A - Fan control system, cooling system and control method for fan - Google Patents
Fan control system, cooling system and control method for fan Download PDFInfo
- Publication number
- CN106762771A CN106762771A CN201710070907.9A CN201710070907A CN106762771A CN 106762771 A CN106762771 A CN 106762771A CN 201710070907 A CN201710070907 A CN 201710070907A CN 106762771 A CN106762771 A CN 106762771A
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- Prior art keywords
- control unit
- fan
- control
- radiating
- strategy
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/20—Cooling means
- G06F1/206—Cooling means comprising thermal management
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Mechanical Engineering (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
The present invention provides a kind of fan control system, and its operation of control to the fan of equipment cooling, the fan control system includes：First control unit, first control unit receives radiating strategy；Second control unit, it is connected with the communication of the first control unit, wherein, in the first control unit normal work, radiating strategy second control unit of write-in, second control unit are based on the operation of the radiating policy control fan by first control unit；In the first control unit cisco unity malfunction, second control unit is based on the operation of default radiating policy control fan.
Description
Technical field
The present invention relates to a kind of fan control system, including the cooling system of the fan control system and fan control side
Method.
Background technology
With continuing to develop for the new techniques such as big data, cloud computing, the application such as electronic equipment, particularly server is more next
It is more extensive.However, because data processing amount is big, electronic equipment can produce substantial amounts of heat in the process of running, if radiating is too late
When, will cause to be damaged or machine of delaying because temperature is too high.
There is the technical scheme and the radiating including fan radiated to electronic equipment using fan in the prior art
System, but the fan control system of prior art, cooling system often cause fan control unstable because itself exception occurs,
So as to thermolysis cannot be played, in turn result in electronic equipment shutdown or cannot normal work.
The content of the invention
At least one aspect it is an object of the invention to overcome problems of the prior art and defect.
The present invention provides a kind of fan control system, its operation of control to the fan of equipment cooling, the fan control
System includes：First control unit, first control unit receives radiating strategy；Second control unit, it is communicated with the first control unit
Connection, wherein, in the first control unit normal work, the radiating strategy is write the second control unit by first control unit,
Second control unit is based on the operation of the radiating policy control fan；It is described in the first control unit cisco unity malfunction
Second control unit is based on the operation of default radiating policy control fan.
In an embodiment of the invention, second control unit monitors the running status of the first control unit, is based on
It is described monitoring come judge first control unit whether normal work；Can not if the second control unit monitors first control unit
Normal work, then operation of second control unit based on default radiating policy control fan.
In an embodiment of the invention, it is described radiating strategy based on device temperature information to be cooled and by described
The radiating strategy is supplied to first control unit by the controller generation of equipment, the controller in real time.
In an embodiment of the invention, the monitoring is realized by following manner：Second control unit monitors institute
The response of the PORT COM between the first control unit and the second control unit is stated, if the response abnormality, the first control unit is judged
Cisco unity malfunction.
The present invention also provides a kind of cooling system, and it includes foregoing fan control system, and multiple fans.
The present invention further provides a kind of control method for fan, the foregoing fan control system of methods described, it is included such as
Lower step：First control unit receives radiating strategy；In the first control unit normal work, first control unit will be described
Radiating strategy the second control unit of write-in, second control unit is based on the operation of the radiating policy control fan；In the first control
During portion's cisco unity malfunction processed, second control unit is based on the operation of default radiating policy control fan.
In an embodiment of the invention, the control method for fan also comprises the following steps：Second control
Portion monitor the first control unit running status, based on it is described monitoring come judge first control unit whether normal work；If
Second control unit monitors the first control unit cisco unity malfunction, then the second control unit is based on default radiating policy control wind
The operation of fan.
In an embodiment of the invention, the control method for fan also comprises the following steps：Based on to be cooled
Device temperature information, the controller generation radiating strategy of the equipment；The radiating strategy is supplied to described the by the controller
One control unit.
In an embodiment of the invention, the control method for fan also comprises the following steps：Second control
Portion monitors the response of the PORT COM between first control unit and the second control unit, if the response abnormality, judges the
One control unit cisco unity malfunction.
Using technical scheme proposed by the invention, it is obtained in terms of at least one of following beneficial technique effects, its
There is provided the fan control of the stabilization for being much better than prior art, so that the radiation stability of electronic equipment is guaranteed, and then
Ensure that electronic equipment reliability of operation.
Brief description of the drawings
These and/or other aspect of the invention will become with advantage from description of preferred embodiments below in conjunction with the accompanying drawings
Obtain substantially and be readily appreciated that, wherein：
Fig. 1 is the structural representation of fan control system of the invention；
Fig. 2 is the flow chart of control method for fan of the invention.
Specific embodiment
For the purpose, technical scheme and advantage for making the disclosure become more apparent, below in conjunction with specific embodiment, and reference
Accompanying drawing, is described in further detail to the disclosure.In the accompanying drawings, identical label correspondence identical element.But, the present invention
There are many different embodiments, it is impossible to be construed to limit the invention to described embodiment；And simply by this hair of offer
Bright embodiment, makes present disclosure comprehensive and complete, and completely pass on idea of the invention to those skilled in the art.
In the disclosure, term " including " and " containing " and its derivative mean including and it is unrestricted；Term "or" is bag
Containing property, mean and/or.
In this manual, following is explanation for describing the various embodiments of disclosure principle, should not be with any
Mode is construed to the scope of limitation invention.Referring to the drawings described below is used to help comprehensive understanding by claim and its equivalent
The exemplary embodiment of the disclosure that thing is limited.It is described below to help understand including various details, but these details should
Think what is be merely exemplary.Therefore, it will be appreciated by those of ordinary skill in the art that without departing substantially from the scope of the present disclosure and spirit
In the case of, embodiment described herein can be made various changes and modifications.Additionally, for clarity and brevity,
Eliminate the description of known function and structure.Additionally, running through accompanying drawing, same reference numerals are used for identity function and operation.
Shown in the drawings of some block diagrams and/or flow chart.It should be understood that some sides in block diagram and/or flow chart
Frame or its combination can be realized by computer program instructions.These computer program instructions can be supplied to all-purpose computer,
The processor of special-purpose computer or other programmable data processing units, so that these instructions can be with when by the computing device
Create the device for realizing illustrated function/operation in these block diagrams and/or flow chart.
Therefore, the technology of the disclosure can be realized in the form of hardware and/or software (including firmware, microcode etc.).Separately
Outward, the technology of the disclosure can take the form of the computer program product on the computer-readable medium of the instruction that is stored with, should
Computer program product is available for instruction execution system to use.In the context of the disclosure, computer-readable medium can be energy
Enough include, store, transmit, propagate or transmit the arbitrary medium of instruction.For example, computer-readable medium can be included but is not limited to
Electricity, magnetic, optical, electromagnetic, infrared or semiconductor system, device, device or propagation medium.The specific example bag of computer-readable medium
Include：Magnetic memory apparatus, such as tape or hard disk (HDD)；Light storage device, such as CD (CD-ROM)；Memory, such as arbitrary access are deposited
Reservoir (RAM) or flash memory；And/or wire/wireless communication link.
Fig. 1 diagrammatically illustrates the structural representation of fan control system of the invention, and its control is to equipment cooling
Fan operation.
As shown in figure 1, fan control system 100 includes the first control unit 110 and the second control unit 120.First control unit
110 receive radiating strategy.Second control unit 120 is connected with the communication of the first control unit 110.
At work, when the first 110 normal work of control unit, the first control unit 110 controls radiating strategy write-in second
Portion processed 120, operation of second control unit 120 based on the radiating policy control fan 200.Can not be just in the first control unit 110
Often during work, operation of second control unit 120 based on default radiating policy control fan 200.
Specific embodiment of the invention, based on different equipment and different operating modes, it uses different radiatings
Strategy, it is however generally that, radiating strategy is provided by the central control of equipment, such that it is able to realize energy-conservation, high efficiency and heat radiation.When
So, the supply of above-mentioned radiating strategy does not constitute limitation of the invention, and it can also use other modes, for example, fan control
System is tactful to provide radiating.Those skilled in the art can be set as the case may be.
Using said fans control system, due to which employs two control units of the first control unit and the second control unit, from
And, occur in the first control unit abnormal, it is impossible to which when normally playing a role, the second control unit still can be controlled to fan,
That is, the stability to fan control is improved, it is ensured that fan reliability service, so that, the radiating of equipment obtains Reliable guarantee, equipment fortune
Capable stability is greatly improved.
As shown in figure 1, in specific embodiment of the invention, it is possible to use the monitoring of the second control unit 120 first is controlled
The running status in portion 110, based on it is described monitoring come judge first control unit 110 whether normal work.If the second control
Portion 120 monitors the cisco unity malfunction of the first control unit 110, then the second control unit 120 can be based on default radiating plan
Slightly control the operation of fan.
Certain aforesaid way is not limitation of the invention, and those skilled in the art can also be using other modes come to the
The running status of one control unit is monitored, but uses aforesaid way, i.e. the first control unit is carried out using the second control unit
Monitoring can cause that fan control system framework is simple, it is easy to accomplish, reduce the probability of fan control system error.
Specific embodiment of the invention, the radiating strategy can based on device temperature information to be cooled and by
The controller 300 of the equipment is generated.The radiating strategy is supplied to first control unit by the controller 300 in real time.
According to above-mentioned implementation method, due to the controller of system, its operational capability is stronger, so that it can improve the accurate of radiating strategy
Property, i.e. more fine radiating strategy is provided according to different situation, so as to realize the energy-conservation and efficiently of radiating.
Specific embodiment of the invention, above-mentioned monitoring is realized by following manner：Second control unit monitors institute
The response of the PORT COM between the first control unit and the second control unit is stated, if the response abnormality, the first control unit is judged
Cisco unity malfunction.Those skilled in the art can also use other monitoring modes, above-mentioned monitoring mode to be easy to implement, and reduce wind
Fan the cost of control system.
Another aspect, as shown in figure 1, the invention provides a kind of cooling system, it includes：Foregoing fan control system
System 100, and multiple fans 200.
The cooling system provided using the present invention, it can carry out energy-conservation, efficient radiating to electronic equipment.
Fig. 2 diagrammatically illustrates the flow chart of control method for fan of the invention.In specific embodiment of the invention,
The method uses foregoing fan control system 100.
As shown in Fig. 2 in step S201, the first control unit 110 receives radiating strategy.
In step S202, judge the first control unit 110 whether normal work.In the first 110 normal work of control unit, side
Method proceeds to step S203, and otherwise method proceeds to step S204.
In step S203, in the first 110 normal work of control unit, the first control unit 110 writes the radiating strategy
Second control unit 120, operation of second control unit 120 based on the radiating policy control fan.
In step S204, in the first 110 cisco unity malfunction of control unit, the second control unit 120 is based on default radiating
The operation of policy control fan.
Using said fans control method, due to which employs two rate-determining steps of the first control unit and the second control unit,
So as to occur in the first control unit abnormal, it is impossible to which when normally playing a role, the second control unit still can be controlled to fan
System, i.e. improve the stability to fan control, it is ensured that fan runs, so that, the radiating of equipment obtains Reliable guarantee, equipment fortune
Capable stability is greatly improved.
In specific embodiment of the invention, the control method for fan can also comprise the following steps：Second control unit
The running status of 120 the first control units 110 of monitoring, whether the normal work of first control unit 110 is judged based on the monitoring
Make；If the second control unit 120 monitors the cisco unity malfunction of the first control unit 110, the second control unit 120 is based on default
Radiating policy control fan operation.
In specific embodiment of the invention, the control method for fan can also comprise the following steps：Based on to be cooled
Device temperature information, the equipment controller generation radiating strategy.The radiating strategy is supplied to the first control by controller
Portion 110.The method that specific embodiment of the invention is provided, more fine radiating plan is provided according to different situations
Slightly, thus realize radiating energy-conservation and efficiently.
In specific embodiment of the invention, the control method for fan can also comprise the following steps：Second control unit
The response of the PORT COM between the 120 monitoring control units 120 of the first control unit 110 and second, if the response abnormality,
Judge the cisco unity malfunction of the first control unit 110.
Hereinafter, the application by an instantiation elaboration according to the embodiment of the present invention in the electronic device.
For example, said system is used for cabinet type electronic equipment, fan control system according to the embodiment of the present invention is to this
The operation of the fan of cabinet type electronic equipment dissipating heat is controlled.
The fan control system 100 includes：First control unit 110, first control unit receives radiating strategy；Second
Control unit 120, it is connected with the communication of the first control unit 110, wherein, in the first 110 normal work of control unit, first control
Radiating strategy second control unit 120 of write-in, second control unit 120 are based on the radiating policy control by portion processed 110
The operation of fan 200；In the first 110 cisco unity malfunction of control unit, second control unit 120 is based on default radiating plan
Slightly control the operation of fan 200.
Embodiments in accordance with the present invention, the controller 300 of cabinet type electronic equipment can be for example micro-control unit, based on this
The environment and running status of cabinet type electronic equipment.
For example, micro-control unit (MCU) can generate radiating strategy, and the radiating strategy is passed through into System Management Bus
(SMBUS) it is supplied to the first control unit 100 in real time.First control unit 100 passes through System Management Bus (SMBUS) by the radiating plan
The second control unit 120 is slightly write, the second control unit 120 is controlled by pulse-width signal (PWM) to the rotating speed of fan.
During the first 110 cisco unity malfunction of control unit, operation of second control unit 120 based on default radiating policy control fan 200.
In this application, the second control unit 120 monitors the running status of the first control unit 110, is sentenced based on the monitoring
Break first control unit 110 whether normal work.Wherein it is possible to pass through the monitoring system of the second control unit 120 management bus
(SMBUS) realized in the response of the interface end of the first control unit 110.For example, embodiments in accordance with the present invention, it is possible to use fixed
When device (watchdog) the regular check response, if not monitoring the response message in the scheduled time, show first control
Device processed 110 is abnormal, then operation of second control unit 120 based on default radiating policy control fan.
Certainly, those skilled in the art can also be using other monitorings and test mode, and above-mentioned application is just for the sake of act
Example and should not be construed limitation of the invention.
Embodiments in accordance with the present invention, in the cabinet type electronic equipment, can be using following control method for fan to its wind
Fan is controlled.
First control unit 110 receives radiating by the microcontroller (MCU) 300 of System Management Bus (SMBUS) slave unit
Strategy；In the first 110 normal work of control unit, the first control unit 110 passes through System Management Bus (SMBUS) the radiating plan
The second control unit 120 is slightly write, second control unit 120 is based on the operation of the radiating policy control fan；In the first control
During 110 cisco unity malfunction of portion processed, second control unit 120 is based on the operation of default radiating policy control fan.
Interface end of the bus (SMBUS) in first control unit 110 can be managed by the monitoring system of the second control unit 120
Respond to realize to the abnormal monitoring of the first controller.For example, it is possible to use timer (watchdog) the regular check response,
If not monitoring the response message in the scheduled time, show the first controller exception, then the second control unit 120 is based on pre-
If radiating policy control fan operation.
By the above method so that the fan control of cabinet type electronic equipment has redundancy scheme, the steady of fan control is improve
It is qualitative.
Although being shown to embodiments of the invention and having been described, it will be understood to those of skill in the art that without departing from
In the case of principle of the invention and essence, can change these embodiments, its scope also falls into right of the invention will
Ask and its equivalent limited range in.
Claims (9)
1. a kind of fan control system, its operation of control to the fan of equipment cooling, the fan control system includes：
First control unit, first control unit receives radiating strategy；
Second control unit, it is connected with the communication of the first control unit,
Wherein,
In the first control unit normal work, first control unit is by radiating strategy second control unit of write-in, described the
Two control units are based on the operation of the radiating policy control fan；
In the first control unit cisco unity malfunction, second control unit is based on the fortune of default radiating policy control fan
OK.
2. fan control system according to claim 1, wherein,
Second control unit monitors the running status of the first control unit, and judging first control unit based on the monitoring is
No normal work；
If the second control unit monitors the first control unit cisco unity malfunction, the second control unit is based on default radiating plan
Slightly control the operation of fan.
3. fan control system according to claim 1,
The radiating strategy is generated based on device temperature information to be cooled by the controller of the equipment, and the controller will
The radiating strategy is supplied to first control unit in real time.
4. fan control system according to claim 2, wherein,
The monitoring is realized by following manner：
Second control unit monitors the response of the PORT COM between first control unit and the second control unit, if the sound
Should be abnormal, then judge the first control unit cisco unity malfunction.
5. a kind of cooling system, it includes：
Fan control system described in any one of Claims 1-4, and
Multiple fans.
6. a kind of control method for fan, using the fan control system described in claim 1, it includes following step to methods described
Suddenly：
First control unit receives radiating strategy；
In the first control unit normal work, first control unit is by radiating strategy second control unit of write-in, described the
Two control units are based on the operation of the radiating policy control fan；
In the first control unit cisco unity malfunction, second control unit is based on the fortune of default radiating policy control fan
OK.
7. control method for fan according to claim 6, also comprises the following steps：
Second control unit monitors the running status of the first control unit, and judging first control unit based on the monitoring is
No normal work；
If the second control unit monitors the first control unit cisco unity malfunction, the second control unit is based on default radiating plan
Slightly control the operation of fan.
8. control method for fan according to claim 6, also comprises the following steps：
Based on device temperature information to be cooled, the controller generation radiating strategy of the equipment；
The radiating strategy is supplied to first control unit by the controller.
9. control method for fan according to claim 7, also comprises the following steps：
Second control unit monitors the response of the PORT COM between first control unit and the second control unit, if the sound
Should be abnormal, then judge the first control unit cisco unity malfunction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710070907.9A CN106762771B (en) | 2017-02-09 | 2017-02-09 | Fan control system, cooling system and control method for fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710070907.9A CN106762771B (en) | 2017-02-09 | 2017-02-09 | Fan control system, cooling system and control method for fan |
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| Publication Number | Publication Date |
|---|---|
| CN106762771A true CN106762771A (en) | 2017-05-31 |
| CN106762771B CN106762771B (en) | 2019-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710070907.9A Active CN106762771B (en) | 2017-02-09 | 2017-02-09 | Fan control system, cooling system and control method for fan |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108170575A (en) * | 2017-12-25 | 2018-06-15 | 曙光信息产业(北京)有限公司 | A kind of control method and device of server radiating |
| CN110213950A (en) * | 2019-07-08 | 2019-09-06 | 武汉雄韬氢雄燃料电池科技有限公司 | A kind of water cooling pile radiator fan control system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW495135U (en) * | 2001-05-18 | 2002-07-11 | Delta Electronics Inc | Multiple heat radiating module |
| US20020094280A1 (en) * | 2001-01-17 | 2002-07-18 | Kuo-Cheng Lin | Backup heat-dissipating system |
| US20050046362A1 (en) * | 2003-08-26 | 2005-03-03 | Wen-Churn Ma | Fan control system |
| CN1812705A (en) * | 2005-01-24 | 2006-08-02 | 大众电脑股份有限公司 | Control system and method for fan of electronic device and radiating system thereof |
| CN201568349U (en) * | 2009-08-07 | 2010-09-01 | 杭州华三通信技术有限公司 | Fan control system and fan controller |
-
2017
- 2017-02-09 CN CN201710070907.9A patent/CN106762771B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020094280A1 (en) * | 2001-01-17 | 2002-07-18 | Kuo-Cheng Lin | Backup heat-dissipating system |
| TW495135U (en) * | 2001-05-18 | 2002-07-11 | Delta Electronics Inc | Multiple heat radiating module |
| US20050046362A1 (en) * | 2003-08-26 | 2005-03-03 | Wen-Churn Ma | Fan control system |
| CN1812705A (en) * | 2005-01-24 | 2006-08-02 | 大众电脑股份有限公司 | Control system and method for fan of electronic device and radiating system thereof |
| CN201568349U (en) * | 2009-08-07 | 2010-09-01 | 杭州华三通信技术有限公司 | Fan control system and fan controller |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108170575A (en) * | 2017-12-25 | 2018-06-15 | 曙光信息产业(北京)有限公司 | A kind of control method and device of server radiating |
| CN110213950A (en) * | 2019-07-08 | 2019-09-06 | 武汉雄韬氢雄燃料电池科技有限公司 | A kind of water cooling pile radiator fan control system |
| CN110213950B (en) * | 2019-07-08 | 2024-01-09 | 武汉雄韬氢雄燃料电池科技有限公司 | Water-cooled pile radiator fan control system |
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| CN106762771B (en) | 2019-01-15 |
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