CN110836195A - Optimization method for fan rotating speed control - Google Patents
Optimization method for fan rotating speed control Download PDFInfo
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- CN110836195A CN110836195A CN201810931748.1A CN201810931748A CN110836195A CN 110836195 A CN110836195 A CN 110836195A CN 201810931748 A CN201810931748 A CN 201810931748A CN 110836195 A CN110836195 A CN 110836195A
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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
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- 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
Abstract
A method for optimizing fan speed control is suitable for a computer system comprising a fan unit, a temperature sensor, a control unit and a magnetic disk storage unit, and comprises the following steps: obtaining a rotating speed vibration comparison table; judging an avoidance interval of a control signal of the fan unit; obtaining a temperature control table of the fan unit; according to the temperature control table, the value of the control signal falling in the avoidance interval is changed to a preset value to form an optimized temperature control table. The optimized temperature control table can be obtained by the optimization method, and the fan rotation speed of the fan unit is controlled accordingly, so that the read-write speed of the disk storage unit can be reduced due to the influence of the vibration generated by the fan unit.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to an optimization method, and more particularly, to an optimization method for controlling the rotational speed of a fan, which can reduce the influence of the vibration of the fan on a disk storage unit.
[ background of the invention ]
With the advancement of technology, in order to ensure the accuracy of reading and writing, the conventional Hard Disk (HD) generally has a sensor for detecting the vibration magnitude to feed back the control of the pickup head of the HD. For example, when the sensor detects that the magnitude of Rotational Vibration (RV) exceeds a predetermined threshold, the disk drive will slow down the read/write speed.
When various heat dissipation fans installed on the computer host rotate, vibrations are generated, and these vibrations are transmitted to the disk drive through the chassis, which may result in the disk drive having to reduce the read/write speed. Therefore, how to reduce the vibration of the computer system to increase the read/write speed of the disk drive becomes a problem to be solved.
Accordingly, the present invention provides an optimization method for controlling the rotation speed of a fan, so that the influence of the vibration generated by the fan at different rotation speeds on the read/write speed of a disk storage unit can be reduced.
[ summary of the invention ]
The technical problem to be solved by the present invention is to provide an optimization method for controlling the rotation speed of a fan, which can reduce the influence of the vibration on a disk storage unit when the fan rotates.
To solve the above technical problem, a method for optimizing fan speed control is applied to a computer system including a fan unit, a temperature sensor, a control unit, and a disk storage unit, and is implemented by the control unit and includes steps (a) to (d).
In step (a), a rotational speed vibration comparison table is obtained, wherein the rotational speed vibration comparison table is related to each corresponding vibration value caused by the fan unit to the magnetic disk storage unit at each rotational speed of the corresponding rotational speed control table.
In step (b), the maximum one of the vibration values is determined according to the rotation speed control table and the rotation speed vibration comparison table, the corresponding magnitude of the control signal is determined, and an avoidance interval including the magnitude of the control signal corresponding to the maximum vibration value is defined.
In step (c), obtaining a temperature control table of the fan unit, wherein the temperature control table is related to the corresponding relationship between the control signal of the fan unit and the ambient temperature measured by the temperature sensor.
In step (d), according to the temperature control table, changing the value of the control signal falling within the avoidance interval to a preset value to become an optimized temperature control table, wherein the preset value is not within the avoidance interval and the rotation speed of the fan is increased.
Preferably, in step (a), the control signal is a Duty Cycle (Duty Cycle) signal for controlling the fan unit to rotate at a higher or lower fan speed.
Preferably, in step (b), when the magnitude of the control signal is in the avoidance interval, the duty ratio of the control signal is greater than a first duty ratio and less than a second duty ratio, and the fan speed corresponding to the fan unit is greater than a first speed and less than a second speed, and the first duty ratio and the second duty ratio are related to a tolerance range of the fan speed corresponding to the maximum vibration value of the fan unit.
Preferably, in step (d), the preset value is greater than or equal to the second duty ratio, so that the fan speed of the fan unit is greater than or equal to the second speed.
Preferably, the method further comprises an accelerometer disposed on the disk storage unit, wherein in step (a), when the fan unit operates at each rotation speed of the rotation speed control table, the vibration value corresponding to each rotation speed in the rotation speed vibration comparison table is obtained according to the measurement result of the accelerometer.
Thus, the present invention provides another method for optimizing fan speed control, which is suitable for a computer system comprising a fan unit, a temperature sensor, a control unit, and a disk storage unit, and is implemented by the control unit and comprises steps (a) to (d).
In step (a), a rotational speed vibration comparison table is obtained, wherein the rotational speed vibration comparison table is related to each corresponding vibration value caused by the fan unit to the magnetic disk storage unit at each rotational speed of the corresponding rotational speed control table.
In step (b), according to the rotation speed control table and the rotation speed vibration comparison table, the vibration value larger than a preset threshold value is judged, and the corresponding size range of the control signal is defined as an avoidance interval.
In step (c), obtaining a temperature control table of the fan unit, wherein the temperature control table is related to the corresponding relationship between the control signal of the fan unit and the ambient temperature measured by the temperature sensor.
In step (d), according to the temperature control table, changing the value of the control signal falling within the avoidance interval to a preset value to become an optimized temperature control table, wherein the preset value is not within the avoidance interval and the rotation speed of the fan is increased.
Preferably, in step (a), the control signal is a Duty Cycle (Duty Cycle) signal for controlling the fan unit to rotate at a higher or lower fan speed.
Preferably, in the step (b), when the magnitude of the control signal is in the avoidance interval, the duty ratio of the control signal is greater than a first duty ratio and less than a second duty ratio, and the fan speed corresponding to the fan unit is greater than a first speed and less than a second speed.
Preferably, in step (d), the preset value is greater than or equal to the second duty ratio, so that the fan speed of the fan unit is greater than or equal to the second speed.
Preferably, the control unit further comprises an accelerometer disposed on the disk storage unit, in step (a), when the fan unit operates at each rotation speed of the rotation speed control table, the control unit obtains the corresponding vibration value in the rotation speed vibration comparison table according to the measurement result of the accelerometer.
Compared with the prior art, the fan speed control optimization method of the invention changes the magnitude of the control signal in the temperature control table falling in the avoidance interval into the preset value by the corresponding relation between the control signal of the fan unit, the fan speed and the vibration values caused by the magnetic disk storage unit, and obtains the optimized temperature control table. So that the influence of the vibration generated by the disk storage unit on the read/write speed of the disk storage unit can be reduced when the control signal required by the environmental temperature is selected according to the optimized temperature control table to control the fan speed of the fan unit.
[ description of the drawings ]
FIG. 1 is a block diagram illustrating a computer system to which the method for optimizing fan speed control according to the present invention is applied.
FIG. 2 is a block diagram illustrating an embodiment of a method for optimizing fan speed control according to the present invention.
Fig. 3 is a broken line diagram illustrating the correspondence between the duty ratio and the vibration value of this embodiment.
Fig. 4 is a broken line diagram illustrating the correspondence between the ambient temperature and the duty ratio of this embodiment.
[ detailed description ] embodiments
Referring to fig. 1, the method for optimizing fan speed control according to the present invention is applied to a computer system 1, wherein the computer system 1 includes a fan unit 11, a control unit 15, a temperature sensor 14, and a disk storage unit 12. The computer system 1 is, for example, a server host, but is not limited thereto. In the present embodiment, the control unit 15 is a Baseboard Management Controller (BMC), but in other embodiments, the control unit 15 may also be a programmable logic device, such as a Complex Programmable Logic Device (CPLD) or a Field Programmable Gate Array (FPGA).
The temperature sensor 14 measures an ambient temperature, such as a temperature of a Central Processing Unit (CPU), a temperature of a specific location of a motherboard, etc., according to a set location. The fan unit 11 comprises at least one fan, for example a fan arranged on the housing. The control unit 15 receives the ambient temperature measured by the temperature sensor 14, and correspondingly generates a control signal to control the rotation speed of the at least one fan of the fan unit 11, so that the ambient temperature meets the design specification of the computer system 1. The disk storage unit 12 is, for example, a disk drive (HD), or multiple disk drives, or other storage devices with heads. In the present embodiment, the fan unit 11 is described as including one fan, but not limited thereto.
Referring to fig. 1 and 2, the method for optimizing the fan speed control includes steps S1-S4.
In step S1, the control unit 15 obtains a rotational speed vibration table corresponding to each corresponding vibration value caused to the disk storage unit 12 by the fan of the fan unit 11 at each rotational speed of the corresponding rotational speed control table. The speed control table is related to the corresponding relationship between the control signal of the fan unit 11 and the fan speed. In the present embodiment, the control signal is a Duty Cycle (Duty Cycle) signal for controlling the fan speed of the fan unit 11. Referring to table one, the rpm control table of the fan is exemplarily described, and the corresponding relationship between the duty ratio of the rpm control table and each value of the rpm is pre-stored in a memory (not shown) readable by the control unit 15, and the memory may be built in the control unit 15, or may be disposed outside the control unit 15 (in the computer system 1), but not limited thereto.
Watch 1
Referring to table two, the rotational speed vibration comparison table is exemplarily described. The corresponding relationship between the duty ratio (i.e. corresponding to different rotation speeds) and the vibration value of the rotation speed vibration comparison table is pre-stored in a memory (not shown) readable by the control unit 15, for example, the memory may be built in the control unit 15, or may be disposed outside the control unit 15 (in the computer system 1), which is not limited thereto. Referring to fig. 3, the corresponding relationship between the duty ratio and the vibration value is schematically illustrated according to the rotation speed vibration comparison table (table two), wherein a curve C1 is a connection line of the vibration values when the duty ratio of the control signal is 0%, 5%, 10%. 100%, respectively.
Watch two
In the present embodiment, the vibration value is expressed in units of gravitational acceleration. Furthermore, the direction of the vibration caused by the fan unit 11 to the disk storage unit 12 may be a single direction or multiple directions (such as the three directions of XYZ perpendicular to each other). Therefore, the vibration value may be the vibration magnitude in a single direction, or may be the vibration magnitude of the vector sum of vibrations in a plurality of directions (for example, the vector sum in three directions of XYZ) without being limited thereto.
It should be additionally noted that: the fan unit 11 is installed on the casing of the computer system 1, for example, when the fan of the fan unit 11 is running, the vibration generated by the fan will be conducted through the casing, so that the disk storage unit 12 receives the corresponding vibration. Continuing with the example of Table one, the frequency of vibration (Hz) generated by the fan is equal to the rotational speed (rpm) of the fan divided by 60, as shown in Table three below. In addition, each vibration frequency shown in table three is a fundamental frequency vibration generated by the fan during operation, when the number of blades of the fan is equal to N, the fan may generate a frequency-doubled vibration due to the imperfect design of the fan, in addition to the fundamental frequency vibration, and the frequency of the frequency-doubled vibration is equal to the frequency of the fundamental frequency vibration multiplied by N, where N is a positive integer. In addition, the fundamental frequency vibration is generally larger than the frequency multiplication vibration, i.e., the fundamental frequency vibration has a larger effect on the disk storage unit 12 than the frequency multiplication vibration. For example, one fan unit 11 includes two fans combined together, and the number of blades of the fan is equal to 5 and 7, respectively, when the duty ratio of the control signal is equal to 20%, the rotation speed of the two fans is 5880rpm, and the fundamental frequency vibration is 98Hz, and the frequency doubling vibration is 490Hz and 686Hz, respectively.
| Duty cycle | Rotational speed rpm | Frequency of |
| 0％ | 3000 | 50 |
| 10％ | 4440 | 74 |
| 20％ | 5880 | 98 |
| 30％ | 10280 | 171 |
| 40％ | 17640 | 294 |
| 50％ | 25000 | 417 |
| 60％ | 32360 | 539 |
| 70％ | 39720 | 662 |
| 80％ | 47080 | 785 |
| 90％ | 54440 | 907 |
Watch III
In step S2, the maximum one of the vibration values is determined according to the rotation speed control table and the rotation speed vibration comparison table, the magnitude of the corresponding control signal is determined, and an avoidance interval including the magnitude of the corresponding control signal with the maximum vibration value is defined. In this embodiment, the preset interval is centered on the magnitude of the control signal corresponding to the largest vibration value, and when the control unit 15 receives the ambient temperature measured by the temperature sensor 14 and correspondingly generates the control signal to control the rotation speed of the at least one fan of the fan unit 11, the control unit is controlled to avoid generating the magnitude of the control signal within the avoidance interval, that is, the duty ratio of the control signal generated by the control unit 15 is greater than a first duty ratio and less than a second duty ratio, and the fan rotation speed corresponding to the fan unit 11 is greater than a first rotation speed and less than a second rotation speed, and the first duty ratio and the second duty ratio are related to a tolerance range of the fan rotation speed corresponding to the largest vibration value of the fan unit 11.
Referring to fig. 3, for example, the maximum value of the vibration values is equal to 2.5g (i.e. the vibration value corresponding to the position P1 in fig. three), the corresponding duty ratio R1 is 25%, the avoidance interval is equal to the duty ratios R3 to R2, i.e. 23% to 27%, the first duty ratio R3 is equal to 23%, the second duty ratio R2 is equal to 27%, and referring to table one, the first rotation speed and the second rotation speed corresponding to the first duty ratio 23% and the second duty ratio 27% are 7200rpm and 8960rpm, respectively, by using interpolation calculation. More specifically, the specification of the fan unit 11 indicates a rotation speed tolerance of the fan, and an upper limit and a lower limit of the tolerance range of the fan rotation speed respectively correspond to the second duty ratio and the first duty ratio, in other words, the specification of the fan is 8080rpm ± 880rpm (corresponding to a 25% duty ratio) for 8080rpm (corresponding to a 25% duty ratio) of the fan rotation speed.
In step S3, a temperature control table of the fan unit 11 is obtained, wherein the temperature control table is related to the corresponding relationship between the control signal of the fan unit 11 and the ambient temperature measured by the temperature sensor 14. Referring to table four, the temperature control table is illustrated, for example, when the duty ratio of the control signal is equal to 60%, the ambient temperature measured by the temperature sensor 14 is equal to 49 degrees celsius, and if the duty ratio of the control signal is changed to 80%, i.e., the rotation speed of the fan is increased, the ambient temperature can be decreased to 48 degrees celsius. The temperature control table is pre-stored in a memory (not shown) readable by the control unit 15, and the memory may be built in the control unit 15 or disposed outside the control unit 15 (in the computer system 1), but not limited thereto.
| Duty | Ambient temperature | |
| 25％ | 56℃ | |
| 30％ | 55℃ | |
| 35％ | 53℃ | |
| 50％ | 50℃ | |
| 60％ | 49℃ | |
| 80％ | 48℃ |
Watch four
In step S4, according to the temperature control table, the value of the control signal falling within the avoidance interval is changed to a predetermined value, which is not within the avoidance interval and increases the rotation speed of the fan, to become an optimized temperature control table. In this embodiment, the preset value is greater than or equal to the second duty ratio, so that the fan speed of the fan unit 11 is greater than or equal to the second speed.
Referring to fig. 4, the corresponding relationship between the ambient temperature and the duty ratio is exemplarily illustrated, wherein a curve C2 is a connection line of the measured ambient temperatures when the duty ratio of the control signal is 25%, 30%, 35%, 50%, 60%, and 80%, respectively.
For example, continuing with the previous example, the avoidance interval is equal to the duty cycles R3-R2, i.e., 23% -27%, the first duty cycle is equal to 23%, and the second duty cycle is equal to 27%. The duty cycle of the control signal calculated by interpolation is 27% corresponding to the ambient temperature T2 degrees celsius 55.6 degrees. And the ambient temperature T1 for a duty cycle R1 equal to 25% is 56 degrees celsius. Therefore, according to the temperature control table (e.g. table four), the duty ratio of the control signal is changed from 23% to 27% (i.e. the predetermined value) to 27%, and the optimized temperature control table (e.g. table five) is generated.
| Duty cycle | Ambient temperature |
| 27％ | 56℃ |
| 27％ | 55.6℃ |
| 30％ | 55℃ |
| 35％ | 53℃ |
| 50％ | 50℃ |
| 60％ | 49℃ |
| 80％ | 48℃ |
Watch five
In summary, when the control unit 15 receives the ambient temperature measured by the temperature sensor 14 and generates the control signal to make the ambient temperature meet the design specification of the computer system 1, the duty ratio of the control signal is determined according to the optimized temperature control table, which not only can achieve the design specification of the ambient temperature, but also can reduce the influence of the vibration on the read/write speed of the disk storage unit 12.
Further, it is to be noted that: in the present embodiment, the avoidance interval of step S2 is related to the tolerance range, and the predetermined interval is centered on the magnitude of the control signal corresponding to the largest vibration value, while in other embodiments, the predetermined interval may not be centered on the magnitude of the control signal corresponding to the largest vibration value, for example, in the foregoing example, the avoidance interval is 23.5% to 27.5% (including 25% of the largest value). Alternatively, in another embodiment, in step S2, the vibration value is determined to be greater than a predetermined threshold according to the rotation speed control table and the rotation speed vibration comparison table, and the corresponding magnitude range of the control signal is defined as the avoidance interval. Referring to fig. 3, for example, if the predetermined threshold is 2g, the first duty cycle and the second duty cycle are about 23% and 28%, respectively.
In addition, the numerical value corresponding relations of the first table to the fifth table can be calculated by using a simple mathematical interpolation method, so that more numerical value corresponding relations can be obtained. Furthermore, in the present embodiment, the vibration values in the rotational speed vibration mapping table of step S1 are obtained by measurement of an accelerometer (not shown), which may be built in the disk storage unit 12 or a separate handheld device, disposed on the disk storage unit 12 during measurement. In addition, the implementation of steps S1-S4 can be implemented by the control unit 15, and in other embodiments, all or part of the steps S1-S4 can be implemented by the computer system 1 or another computer host, so as to generate the optimized temperature control table.
In summary, the optimized temperature control table is obtained by changing the magnitude of the control signal in the temperature control table falling within the avoidance interval to the predetermined value according to the corresponding relationship between the control signal of the fan unit 11 and the fan speed and the vibration values caused by the disk storage unit 12. So that when the control signal required by the environment temperature is selected according to the optimized temperature control table to control the fan speed of the fan unit 11, the influence of the vibration generated by the disk storage unit 12 on the read/write speed of the disk storage unit 12 can be reduced, thereby achieving the purpose of the present invention.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method for optimizing fan speed control, suitable for a computer system comprising a fan unit, a temperature sensor, a control unit, and a disk storage unit, the method being implemented by the control unit and comprising the steps of:
(a) obtaining a rotational speed vibration comparison table, wherein the rotational speed vibration comparison table is related to each corresponding vibration value of the magnetic disk storage unit caused by the fan unit under each rotational speed of a corresponding rotational speed control table;
(b) judging the largest one of the vibration values according to the rotation speed control table and the rotation speed vibration comparison table, corresponding to the magnitude of the control signal, and defining an avoidance interval containing the magnitude of the control signal corresponding to the largest vibration value;
(c) obtaining a temperature control table of the fan unit, wherein the temperature control table is related to the corresponding relation between the control signal of the fan unit and the ambient temperature measured by the temperature sensor; and
(d) according to the temperature control table, the value of the control signal falling in the avoidance interval is changed into a preset value to form an optimized temperature control table, and the preset value is not in the avoidance interval and the rotating speed of the fan is increased.
2. The method of claim 1, wherein in step (a), the control signal is a duty cycle of a signal to control the fan speed of the fan unit.
3. The method as claimed in claim 2, wherein in step (b), when the magnitude of the control signal is in the avoidance interval, the duty ratio of the control signal is greater than a first duty ratio and less than a second duty ratio, and the fan speed corresponding to the fan unit is greater than a first speed and less than a second speed, the first duty ratio and the second duty ratio are related to a tolerance range of the fan speed corresponding to the maximum vibration value of the fan unit.
4. The method as claimed in claim 3, wherein in step (d), the predetermined value is greater than or equal to the second duty ratio, so that the fan speed of the fan unit is greater than or equal to the second speed.
5. The method as claimed in claim 1, further comprising using an accelerometer disposed on the disk storage unit, wherein in step (a), when the fan unit operates at each rotation speed of the rotation speed control table, the control unit obtains the corresponding vibration value in the rotation speed vibration table according to the measurement result of the accelerometer.
6. A method for optimizing fan speed control, suitable for a computer system comprising a fan unit, a temperature sensor, a control unit, and a disk storage unit, the method being implemented by the control unit and comprising the steps of:
(a) obtaining a rotational speed vibration comparison table, wherein the rotational speed vibration comparison table is related to each corresponding vibration value of the magnetic disk storage unit caused by the fan unit under each rotational speed of a corresponding rotational speed control table;
(b) judging the corresponding control signal size range if one of the vibration values is larger than a preset threshold value according to the rotation speed control table and the rotation speed vibration comparison table, and defining the control signal size range as an avoidance interval;
(c) obtaining a temperature control table of the fan unit, wherein the temperature control table is related to the corresponding relation between the control signal of the fan unit and the ambient temperature measured by the temperature sensor; and
(d) according to the temperature control table, the value of the control signal falling in the avoidance interval is changed into a preset value to form an optimized temperature control table, and the preset value is not in the avoidance interval and the rotating speed of the fan is increased.
7. The method as claimed in claim 6, wherein in the step (a), the control signal is a duty ratio of a signal to control the fan speed of the fan unit.
8. The method as claimed in claim 7, wherein in the step (b), when the magnitude of the control signal is in the avoidance interval, the duty ratio of the control signal is greater than a first duty ratio and less than a second duty ratio, and the fan speed corresponding to the fan unit is greater than a first speed and less than a second speed.
9. The method of claim 8, wherein in step (d), the predetermined value is greater than or equal to the second duty ratio, so that the fan speed of the fan unit is greater than or equal to the second speed.
10. The method as claimed in claim 6, further comprising an accelerometer disposed on the disk storage unit, wherein in step (a), when the fan unit operates at each rotation speed of the rotation speed control table, the control unit obtains the corresponding vibration value in the rotation speed vibration table according to the measurement result of the accelerometer.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101876320A (en) * | 2010-06-13 | 2010-11-03 | 中兴通讯股份有限公司 | Method and device for controlling fan speed |
| CN102192175A (en) * | 2010-03-01 | 2011-09-21 | 纬创资通股份有限公司 | Fan control system and method for modulating rotation speed of fan |
| CN103827774A (en) * | 2011-09-23 | 2014-05-28 | 苹果公司 | Circumventing frequency excitations in a computer system |
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2018
- 2018-08-16 CN CN201810931748.1A patent/CN110836195A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102192175A (en) * | 2010-03-01 | 2011-09-21 | 纬创资通股份有限公司 | Fan control system and method for modulating rotation speed of fan |
| CN101876320A (en) * | 2010-06-13 | 2010-11-03 | 中兴通讯股份有限公司 | Method and device for controlling fan speed |
| CN103827774A (en) * | 2011-09-23 | 2014-05-28 | 苹果公司 | Circumventing frequency excitations in a computer system |
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Application publication date: 20200225 |