CN102375503A - Fan rotation speed control system and method - Google Patents
Fan rotation speed control system and method Download PDFInfo
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- CN102375503A CN102375503A CN2010102475261A CN201010247526A CN102375503A CN 102375503 A CN102375503 A CN 102375503A CN 2010102475261 A CN2010102475261 A CN 2010102475261A CN 201010247526 A CN201010247526 A CN 201010247526A CN 102375503 A CN102375503 A CN 102375503A
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Abstract
The invention relates to a fan rotation speed control system and method. The method comprises the following steps of: setting an RPM (Revolutions Per Minute) range corresponding to a value of PWM (Pulse-Width Modulation) Duty Cycle, and setting a pre-set rotation speed improvement value; reading an PWM Duty Cycle instruction given to a fan by a rotation speed control unit in real time, and obtaining the value of the PWM Duty Cycle; detecting the actual rotation speed of the fan in real time; when the actual rotation speed is more than the maximum value of the RPM range, subtracting one rotation speed improvement value from the value of the PWM Duty Cycle in the instruction given to the fan by the rotation speed control unit; and, when the actual rotation speed is less than the minimum value of the RPM range, adding one rotation speed improvement value to the value of the PWM Duty Cycle in the instruction given to the fan by the rotation speed control unit. By using the fan rotation speed control system and method disclosed by the invention, the risk in insufficient heat radiating capability can be avoided.
Description
Technical field
The present invention relates to a kind of fan rotary speed control system and method.
Background technology
The design of server is in order to reach the target of energy saving low noise at present; Usually all can hope when low ambient temperature; Make fan remain on slow-revving situation as far as possible, but because the restriction of fan design itself, the rotating speed tolerance when the slow-speed of revolution all can be difficult to control especially.Reason owing to the fan specification; When if system gives speed setting 850RPM (the revolutions perminute of fan during at low temperature; The per minute rotating speed); Be that the instruction that system bios/BMC gives fan is PWM DutyCycle=20%, if but the rotating speed of actual fan performance is lower than 850RPM, and there is the not enough risk of heat-sinking capability in the system that will make.
Summary of the invention
In view of above content, be necessary to provide a kind of fan rotary speed control system and method, the slow-speed of revolution that can reach the power saving low noise is set down, can take into account the demand of system radiating again.
A kind of fan rotary speed control system runs in the electronic installation, and this electronic installation comprises rotary speed controling unit and fan.This system comprises: setting module is used to set the pairing per minute rotating speed of the value RPM scope of pulse-length modulation work period PWM Duty Cycle, and sets a preset rotating speed improvement value; Read module is used for reading the PWMDuty Cycle instruction that rotary speed controling unit gives fan in real time, and obtains the value of PWM Duty Cycle; Detection module is used for detecting in real time the fan actual speed, and the unit of this actual speed is RPM; Control module is used for when this actual speed during greater than the maximal value of this RPM scope, and the value that the control rotary speed controling unit gives the PWM Duty Cycle in the instruction of fan reduces by a rotating speed improvement value; Described control module also is used for when actual speed during less than the minimum value of this RPM scope, and the value that the control rotary speed controling unit gives the PWM Duty Cycle in the instruction of fan increases a rotating speed improvement value.
A kind of fan rotational frequency control method is applied in the electronic installation, and this electronic installation comprises rotary speed controling unit and fan.This method comprises the steps: that (a) sets the pairing per minute rotating speed of the value RPM scope of pulse-length modulation work period PWM Duty Cycle, and sets a preset rotating speed improvement value; (b) read the PWM Duty Cycle instruction that rotary speed controling unit gives fan in real time, and obtain the value of PWM Duty Cycle; (c) detect the fan actual speed in real time, the unit of this actual speed is RPM; (d) when this actual speed during greater than the maximal value of the pairing RPM scope of value of the PWM Duty Cycle that is obtained, the value that the control rotary speed controling unit gives the PWM Duty Cycle in the instruction of fan reduces by a rotating speed improvement value, and returns step (b); (e) when this actual speed during less than the minimum value of the pairing RPM scope of value of the PWM Duty Cycle that is obtained, the value that the control rotary speed controling unit gives the PWM Duty Cycle in the instruction of fan increases a rotating speed improvement value, and returns step (b).
Compared to prior art, fan rotary speed control system of the present invention and method, the slow-speed of revolution that can reach the power saving low noise is set down, can take into account the demand of system radiating again.Simultaneously, the rotating speed that can control fan meets the desired rotating speed of system of electronic installation, also can avoid the not enough risk of heat-sinking capability.
Description of drawings
Fig. 1 is the configuration diagram of fan rotary speed control system preferred embodiment of the present invention.
Fig. 2 is the functional block diagram of fan rotary speed control system preferred embodiment of the present invention.
Fig. 3 is the synoptic diagram of value of the pairing RPM of value of PWM Duty Cycle.
Fig. 4 is the process flow diagram of fan rotational frequency control method preferred embodiment of the present invention.
The main element symbol description
| Electronic installation | ?1 |
| Rotary speed controling unit | ?10 |
| Fan rotary speed control system | ?20 |
| Fan | ?30 |
| Setting module | ?200 |
| Read module | ?202 |
| Detection module | ?204 |
| Judge module | ?206 |
| Control module | ?208 |
Embodiment
As shown in Figure 1, be the configuration diagram of fan rotary speed control system preferred embodiment of the present invention.In the present embodiment, this fan rotary speed control system 20 runs in the electronic installation 1.Described electronic installation 1 can for computing machine (Personal Computer, PC), notebook computer (Notebook), server any suitable electronic installations such as (Server).This electronic installation 1 comprises rotary speed controling unit 10 and fan 30.Described rotary speed controling unit 10 is connected with fan 30 with the rotating speed of control fan 30.Described rotary speed controling unit 10 can be BIOS (Basic Input/ OutputSystem, basic input/input system), BMC any suitable unit such as (Base Motherboard Controller, baseboard management controllers).In this preferred embodiment, this rotary speed controling unit 10 is used to give the instruction of fan 30, control fan 30 rotating speeds, and said instruction is PWM (Pulse WidthModulation, pulse-length modulation) Duty Cycle (work period).If PWM Duty Cycle=20% is expressed in the instruction of described PWM DutyCycle, represent that then requiring the rotating speed of fan 30 is 20%Duty Cycle.Said fan 30 is mainly used in to the element in the electronic installation 1 (routine central processor CPU) and dispels the heat.
As shown in Figure 2, be the functional block diagram of Fig. 1 fan revolution speed control system 20.This fan rotary speed control system 20 comprises setting module 200, read module 202, detection module 204, judge module 206 and control module 208.The alleged module of the present invention is to accomplish the computer program code segments of a specific function, be more suitable in describing the implementation of software in computing machine than program, therefore below the present invention to all describing in the software description with module.
Said setting module 200 is used to set the pairing RPM scope of value of PWM Duty Cycle.As shown in Figure 3, pairing RPM when for example setting PWM Duty Cycle=20% (revolutions per minute, per minute rotating speed) scope is 850RPM～1150RPM.The pairing RPM scope of value of the PWM Duty Cycle of said setting can situation according to the actual requirements be set.
Described setting module 200 also is used to set a preset rotating speed improvement value.For example, said preset rotating speed improvement value can be made as 2%.
Described read module 202 is used for reading the PWM Duty Cycle instruction that rotary speed controling unit 10 gives fan 30 in real time, and obtains the value of PWM Duty Cycle.
Described detection module 204 is used for detecting in real time fan 30 actual speed, and the unit of actual speed is RPM here.In this preferred embodiment, described detection module 204 is through the actual speed of control rotary speed controling unit 10 inspection fans 30 feedbacks.
Described judge module 206 is used for the pairing RPM scope of value according to the PWM Duty Cycle that sets, and whether the actual speed of judging fan 30 is within the pairing RPM scope of value of the PWM Duty Cycle that is obtained.For example; The value of PWM Duty Cycle is 20% o'clock; Its pairing RPM scope is 850RPM～1150RPM, and when the value of the PWM Duty Cycle that is obtained is 20%, described judge module 206 judges that the actual speed of fan 30 is whether within 850RPM～1150RPM scope.What should explain is, when the actual speed of fan 30 is 850RPM, the actual speed that described judge module 206 is judged fans 30 is within this corresponding 850RPM～1150RPM.
Described judge module 206 also is used for when within the pairing RPM scope of the value of the PWM DutyCycle that actual speed is not being obtained, judges that this actual speed is whether greater than the maximal value of this RPM scope.
Described control module 208 is used for when this actual speed during greater than the maximal value of this RPM scope, and the value that control rotary speed controling unit 10 gives the PWM Duty Cycle in the instruction of fan 30 reduces by a rotating speed improvement value.
Described control module 208 also is used for when actual speed during less than the minimum value of this RPM scope, and the value that control rotary speed controling unit 10 gives the PWM Duty Cycle in the instruction of fan 30 increases a rotating speed improvement value.
Described control module 208 also is used for when within the pairing RPM scope of value of the PWM Duty Cycle that actual speed is being obtained, and it is constant to keep rotary speed controling unit 10 to give the value of the PWM Duty Cycle in the instruction of fan 30.
As shown in Figure 4, be the process flow diagram of fan rotational frequency control method preferred embodiment of the present invention.Step S10, said setting module 200 is set the pairing RPM scope of value of PWM Duty Cycle, and sets a preset rotation speed improvement value.The pairing RPM scope of value of the PWM Duty Cycle of said setting can situation according to the actual requirements be set.Said preset rotating speed improvement value can be made as 2%.
Step S11, described read module 202 read the PWM Duty Cycle instruction that rotary speed controling unit 10 gives fan 30 in real time, and obtain the value of PWM Duty Cycle.
Step S12, described detection module 204 detects fan 30 actual speed in real time, and the unit of actual speed is RPM here.
Step S13, according to the pairing RPM scope of value of the PWM Duty Cycle that sets, described judge module 206 judges that the actual speed of fan 30 is whether within the pairing RPM scope of the value of the PWM DutyCycle that is obtained.When within the pairing RPM scope of the value of the PWM DutyCycle that actual speed is being obtained, get into step S14; When within the pairing RPM scope of value of the PWM Duty Cycle that actual speed is not being obtained, get into step S15.
Step S14, it is constant to keep rotary speed controling unit 10 to give the value of the PWM DutyCycle in the instruction of fan 30, and flow process finishes.
Step S15, described judge module 206 judge that this actual speed is whether greater than the maximal value of this RPM scope.When this actual speed during, get into step S16 greater than the maximal value of this RPM scope; When actual speed is not more than the maximal value of this RPM scope, when promptly representing this actual speed, get into step S17 less than the minimum value of this RPM scope.
The value that step S16, described control module 208 control rotary speed controling units 10 give the PWM Duty Cycle in the instruction of fan 30 reduces by a rotating speed improvement value.
The value that step S17, described control module 208 control rotary speed controling units 10 give the PWM Duty Cycle in the instruction of fan 30 increases a rotating speed improvement value.
What should explain at last is; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although the present invention is specified with reference to preferred embodiment; Those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention, and do not break away from the spirit and the scope of technical scheme of the present invention.
Claims (8)
1. a fan rotary speed control system runs in the electronic installation, and this electronic installation comprises rotary speed controling unit and fan, it is characterized in that, this system comprises:
Setting module is used to set the pairing per minute rotating speed of the value RPM scope of pulse-length modulation work period PWM Duty Cycle, and sets a preset rotating speed improvement value;
Read module is used for reading the PWM Duty Cycle instruction that rotary speed controling unit gives fan in real time, and obtains the value of PWM Duty Cycle;
Detection module is used for detecting in real time the fan actual speed;
Control module is used for when this actual speed during greater than the maximal value of this RPM scope, and the value that the control rotary speed controling unit gives the PWM Duty Cycle in the instruction of fan reduces by a rotating speed improvement value;
Described control module also is used for when actual speed during less than the minimum value of this RPM scope, and the value that the control rotary speed controling unit gives the PWM Duty Cycle in the instruction of fan increases a rotating speed improvement value.
2. fan rotary speed control system as claimed in claim 1; It is characterized in that; This control module also is used for when actual speed is not less than the minimum value of this RPM scope and is not more than the maximal value of this RPM scope, and it is constant to keep rotary speed controling unit to give the value of the PWM Duty Cycle in the instruction of fan.
3. fan rotary speed control system as claimed in claim 1 is characterized in that, described rotary speed controling unit is basic input-output system BIOS or baseboard management controller BMC.
4. fan rotary speed control system as claimed in claim 1 is characterized in that, described electronic installation is computing machine, notebook computer or server.
5. a fan rotational frequency control method is applied in the electronic installation, and this electronic installation comprises rotary speed controling unit and fan, it is characterized in that, this method comprises the steps:
(a) set the pairing per minute rotating speed of the value RPM scope of pulse-length modulation work period PWM Duty Cycle, and set a preset rotating speed improvement value;
(b) read the PWM Duty Cycle instruction that rotary speed controling unit gives fan in real time, and obtain the value of PWM Duty Cycle;
(c) detect the fan actual speed in real time;
(d) when this actual speed during greater than the maximal value of the pairing RPM scope of value of the PWM Duty Cycle that is obtained, the value that the control rotary speed controling unit gives the PWM Duty Cycle in the instruction of fan reduces by a rotating speed improvement value, and returns step (b);
(e) when this actual speed during less than the minimum value of the pairing RPM scope of value of the PWM Duty Cycle that is obtained, the value that the control rotary speed controling unit gives the PWM Duty Cycle in the instruction of fan increases a rotating speed improvement value, and returns step (b).
6. fan rotational frequency control method as claimed in claim 5 is characterized in that, this method also comprises step:
When this actual speed was not less than the minimum value of this RPM scope and is not more than the maximal value of this RPM scope, it was constant to keep rotary speed controling unit to give the value of the PWM Duty Cycle in the instruction of fan.
7. fan rotational frequency control method as claimed in claim 5 is characterized in that, described rotary speed controling unit is basic input-output system BIOS or baseboard management controller BMC.
8. fan rotational frequency control method as claimed in claim 5 is characterized in that, described electronic installation is computing machine, notebook computer or server.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102475261A CN102375503A (en) | 2010-08-06 | 2010-08-06 | Fan rotation speed control system and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102475261A CN102375503A (en) | 2010-08-06 | 2010-08-06 | Fan rotation speed control system and method |
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| CN102375503A true CN102375503A (en) | 2012-03-14 |
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| CN2010102475261A Pending CN102375503A (en) | 2010-08-06 | 2010-08-06 | Fan rotation speed control system and method |
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Cited By (7)
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| CN103016381A (en) * | 2012-12-12 | 2013-04-03 | 曙光信息产业股份有限公司 | Fan speed-regulating system for server |
| CN103869101A (en) * | 2012-12-10 | 2014-06-18 | 鸿富锦精密工业（深圳）有限公司 | Verification system and verification method for fan tachometer |
| CN105317712A (en) * | 2014-08-01 | 2016-02-10 | 陈家德 | Multi-rotor ceiling fan capable of achieving stable revolution and control method thereof |
| CN105508270A (en) * | 2014-09-22 | 2016-04-20 | 联想(北京)有限公司 | Method and device for determining rotation speed of fan |
| CN108302059A (en) * | 2015-12-10 | 2018-07-20 | 中国长城科技集团股份有限公司 | Fan rotational frequency control method and device |
| CN111706539A (en) * | 2020-06-09 | 2020-09-25 | 深圳市汇川技术股份有限公司 | Method and device for regulating and controlling rotating speed of motor fan and readable storage medium |
| CN111706538A (en) * | 2020-06-09 | 2020-09-25 | 深圳市汇川技术股份有限公司 | Fan protection method, device, equipment and computer storage medium |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103869101A (en) * | 2012-12-10 | 2014-06-18 | 鸿富锦精密工业（深圳）有限公司 | Verification system and verification method for fan tachometer |
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| CN105317712A (en) * | 2014-08-01 | 2016-02-10 | 陈家德 | Multi-rotor ceiling fan capable of achieving stable revolution and control method thereof |
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| CN108302059A (en) * | 2015-12-10 | 2018-07-20 | 中国长城科技集团股份有限公司 | Fan rotational frequency control method and device |
| CN108302059B (en) * | 2015-12-10 | 2020-05-15 | 中国长城科技集团股份有限公司 | Fan rotating speed control method and device |
| CN111706539A (en) * | 2020-06-09 | 2020-09-25 | 深圳市汇川技术股份有限公司 | Method and device for regulating and controlling rotating speed of motor fan and readable storage medium |
| CN111706538A (en) * | 2020-06-09 | 2020-09-25 | 深圳市汇川技术股份有限公司 | Fan protection method, device, equipment and computer storage medium |
| CN111706539B (en) * | 2020-06-09 | 2022-03-01 | 深圳市汇川技术股份有限公司 | Method and device for regulating and controlling rotating speed of motor fan and readable storage medium |
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Application publication date: 20120314 |