TWI726175B - Fan control method - Google Patents

Abstract

A fan control method comprises: determining whether a processor power load of a processor is larger a load threshold; determining whether a processor temperature of a processor is larger than a temperature threshold; choosing a set of PID parameter according to the aforementioned determination wherein the set of PID parameter includes a proportion coefficient and a corresponding integration coefficient; obtaining a temperature difference of the processor; generating a first pulse width modulation value according to the temperature value and the set of PID parameter; receiving an operation temperature of at least one electronic component on a mainboard to generate a plurality of second pulse width modulation value, and comparing the first pulse width modulation value and the plurality of second pulse width modulation value to obtain the maximum for generating a fan control signal to control the fan.

Description

Fan control method

The present invention relates to a fan control method, especially an adaptive fan control method.

Traditional fan speed control strategies often use general proportional integration differentiation (PID) speed control or linear speed control. However, the general proportional-integral-differential speed control cannot respond immediately when the power consumption of the system components changes drastically, which will easily cause the components to be overheated at an instant. For linear speed control, the applicability of linear speed control is poor. , And it is easy to waste power consumption.

The present invention is to provide a fan control method to overcome the shortcomings of the conventional proportional-integral-differential speed control and linear speed control.

The invention discloses a fan control method. The described fan control method is suitable for a motherboard. The motherboard is provided with a processor and is electrically connected to a fan to dissipate heat from the motherboard. The fan control method includes: determining whether a processor power load value of the processor is greater than a load threshold value, and generating a load determination result accordingly; determining whether a processor temperature of the processor is not greater than a temperature threshold value , And generate a temperature judgment result accordingly; select a set of PID coefficients corresponding to the load judgment result and the temperature judgment result, the set of PID coefficients including a proportional coefficient and a corresponding integral coefficient; obtain a temperature difference value of the processor , And generate a first pulse width modulation value according to the temperature difference value and the set of PID coefficients; and receive a working temperature of at least one electronic component on the motherboard to calculate and generate a plurality of second pulse width modulation values, The first pulse width modulation value is compared with the plurality of second pulse width modulation values and the maximum value is obtained to generate a fan control signal to control the operation of the fan.

The above description of the disclosure and the following description of the implementation manners are used to demonstrate and explain the spirit and principle of the present invention, and to provide a further explanation of the patent application scope of the present invention.

FIG. 1 is a flowchart of the steps of a fan control method according to an embodiment of the present invention.

FIG. 2 is a step flow chart of some steps of a fan control method according to another embodiment of the present invention.

FIG. 3 is a step-by-step flowchart of some steps of a fan control method according to another embodiment of the present invention.

FIG. 4 is a step flow chart of some steps of a fan control method according to another embodiment of the present invention.

FIG. 5 is a step flow chart of some steps of a fan control method according to another embodiment of the present invention.

FIG. 6A is a method flowchart of some steps of a fan control method according to an embodiment of the present invention.

6B is a method flowchart of another part of the steps of the fan control method according to an embodiment of the present invention.

FIG. 6C is a method flowchart of another part of the fan control method according to an embodiment of the present invention.

FIG. 7A is a schematic diagram of experimental results of a fan control method according to an embodiment of the present invention.

FIG. 7B is a schematic diagram of experimental results of the fan control method according to a comparative embodiment.

FIG. 7C is a schematic diagram of experimental results of the fan control method according to another embodiment of the present invention.

FIG. 7D is a schematic diagram of experimental results of the fan control method according to another comparative embodiment.

FIG. 7E is a schematic diagram of experimental results of the fan control method according to another embodiment of the present invention.

FIG. 7F is a schematic diagram of the experimental results of the fan control method according to a further comparative embodiment.

The detailed features and advantages of the present invention will be described in detail in the following embodiments. The content is sufficient to enable anyone familiar with the relevant art to understand the technical content of the present invention and implement it accordingly, and according to the content disclosed in this specification, the scope of patent application and the drawings. Anyone who is familiar with relevant skills can easily understand the purpose and advantages of the present invention. The following examples further illustrate the viewpoints of the present invention in detail, but do not limit the scope of the present invention by any viewpoint.

Please refer to FIG. 1. FIG. 1 is a flowchart of the steps of a fan control method according to an embodiment of the present invention. The present invention provides a fan control method, which is suitable for a motherboard. The motherboard is provided with a processor, and the motherboard is electrically connected with a fan to dissipate the motherboard. The fan control method provided by the present invention can be used for, for example, a control chip on a motherboard, but is not limited to this. As shown in FIG. 1, the fan control method includes: in step S101, determining whether a processor power load value of the processor is greater than a load threshold value, and generating a load determination result accordingly; in step S103, determining Whether a processor temperature of the processor is not greater than a temperature threshold, and a temperature judgment result is generated accordingly; in step S105, a group of PID coefficients is selected according to the load judgment result and the temperature judgment result, and the group PID The coefficient includes at least a proportional coefficient and a corresponding integral coefficient; in step S107, a temperature difference value of the processor is obtained, and a first pulse width modulation value is generated according to the temperature difference value and the set of PID coefficients; in step In S109, receiving a job of at least one electronic component on the motherboard A plurality of second pulse width modulation values are generated by temperature calculation, the first pulse width modulation value is compared with the plurality of second pulse width modulation values, and the first pulse width modulation value is obtained The maximum value of the second pulse width modulation value and the plurality of second pulse width modulation values is used to generate a fan control signal to control the operation of the fan.

In addition to the above steps, the fan control method provided by the present invention further includes other steps. Please refer to FIGS. 2 to 5 altogether. FIGS. 2 to 5 are respectively a step-by-step flowchart of partial steps of a fan control method according to four embodiments of the present invention.

As shown in FIG. 2, in step S201, when the load judgment result is no and the temperature judgment result is yes, the proportional coefficient is set as the first constant value according to the corresponding selected group of PID coefficients, and the integral coefficient is set as The first integral value; in step S203, when the load judgment result is no and the temperature judgment result is no, the proportional coefficient is set to the second constant value according to the corresponding selected group of PID coefficients, and the integral coefficient is set to The first integral value, wherein the first constant value and the second constant value are different values.

As shown in FIG. 3, in step S301, it is determined whether the temperature difference is less than a temperature difference threshold; in step S303, when the load judgment result is no and the temperature judgment result is yes, the temperature difference threshold is set to a first A temperature difference threshold value; in step S305, when the temperature difference value is not less than the first temperature difference threshold value, adjust the value of the temperature difference value to the first temperature difference threshold value; in step S307, when the load judgment result is no And when the temperature judgment result is no, the temperature difference threshold value is set as a second temperature difference threshold value; in step S309, when the temperature difference value is not less than the second temperature difference threshold value, the value of the temperature difference value is adjusted to the first temperature difference value. Two temperature difference threshold values; in step S311, the first pulse width modulation value is generated according to the adjusted temperature difference value and the set of PID coefficients.

As shown in FIG. 4, in step S401, a duty cycle increase is generated according to the temperature difference value and the set of PID coefficients, and the duty cycle increase is related to the duty cycle of the fan control signal; In step S403, it is determined whether the changing trend of the processor load value shows a gradual increase trend according to at least one historical value of the processor load value within a set time; In S405, when the transformation trend is an increasing trend and there is a negative value corresponding to the increase in the duty cycle generated within the set time, the negative values in the increase in the duty cycle are removed; in step S407, The first pulse width modulation value is generated according to the increase in the duty cycle after the negative value is removed.

As shown in FIG. 5, in step S501, a current pulse width modulation signal is generated according to the temperature difference value and the set of PID coefficients; in step S503, at least one historical control signal of the fan control signal is acquired, and the at least A historical control signal and the current pulse width modulation signal are averaged to generate the first pulse width modulation signal.

Please also refer to FIGS. 6A to 6C to further explain the fan control method. FIGS. 6 to 6C are flowcharts of the fan control method according to an embodiment of the present invention. In practice, the motherboard may be provided with one or more processors. In the embodiments shown in FIGS. 6A to 6C, two processors on the motherboard are taken as an example for description.

In step S601, various relevant parameters of the processor are obtained, such as the current processor power load value of the processor, the rated power of the processor, and the temperature value of the processor, but not limited to this.

In step S603, it is compared whether the processor power load value is greater than the load threshold value. The load threshold is, for example, the rated power of the processor multiplied by a factor. In this embodiment, the load threshold value is, for example, the rated power of the microprocessor multiplied by 0.92. When it is determined that the processor power load value of one of the two processors is not greater than the load threshold value, proceed to step S605; otherwise, when it is determined that the processor power load value of one of the two processors is greater than the load threshold value When the value is set, step S627 is performed.

In step S605, it is further determined whether the processor temperature is less than the temperature threshold. The temperature threshold is, for example, the upper limit of the working temperature of the processor plus a compensation value or subtracting a compensation value. In this embodiment, the temperature threshold is the upper limit of the working temperature of the processor minus 5 degrees (Celsius). When it is determined that the processor temperature is less than the temperature threshold, step S607 is performed. When it is determined that the processor temperature is not less than the temperature threshold, step S609 is performed.

In step S607, it is determined whether a temperature difference value of the processor is less than a first Reference. In practice, the temperature difference may be the difference between the current processor temperature and a historical temperature. The historical temperature is, for example, the processor temperature before a preset time. In this embodiment, the temperature difference value is, for example, the difference between the current processor temperature and the processor temperature 1 second ago, and the first reference value is, for example, 5 degrees (Celsius). When it is determined that the temperature difference value of the processor is smaller than the first reference value, step S611 is performed. When it is determined that the temperature difference value of the processor is not less than the first reference value, step S613 is performed.

In step S609, it is determined whether a temperature difference value of the processor is smaller than a second reference value. The relevant details of the temperature difference value are as described above, and will not be repeated here. In this embodiment, the second reference value is, for example, 10 degrees. When it is determined that the temperature difference value of the processor is smaller than the second reference value, step S615 is performed. When it is determined that the temperature difference value of the processor is not less than the second reference value, step S617 is performed.

In step S611, the proportional coefficient is set as the first constant value according to the correspondingly selected PID coefficient, and the integral coefficient is set as the first integral value. In this embodiment, the first constant value is 3.5, and the first integral value is 0.5.

In step S613, the temperature difference value is adjusted to the first temperature difference threshold value.

In step S615, the proportional coefficient is set as a second constant value according to the correspondingly selected PID coefficient, and the integral coefficient is set as a first integral value, wherein the first constant value and the second constant value are different values. In this embodiment, the second constant value is 2.

In step S617, the temperature difference value is adjusted to the second temperature difference threshold value.

In step S619, the current pulse width modulation value is generated according to the temperature difference value and the selected PID parameter.

In step S621, at least one historical pulse width modulation value and the current pulse width modulation value are averaged to generate a first pulse width modulation value. The historical pulse width modulation value is, for example, the current pulse width modulation value calculated before. In this embodiment, the current pulse width modulation value and two historical pulse width modulation values are averaged, but the number of historical pulse width modulation values used for averaging is not limited to this.

In step S623, the first pulse width modulation value is combined with a plurality of second pulse waves The width modulation value is compared and the maximum value is obtained to generate a fan control signal to control the operation of the fan. Each of the second pulse width modulation values is, for example, respectively associated with the pulse width modulation value corresponding to the power supply of at least one electronic component on the motherboard except the processor. The at least one electronic component is, for example, an NVMe interface, a memory, or a hard disk, but it is not limited to this.

When entering step S625 from step S623, the pulse width modulation value selected in step S623 is output to the power module to generate a corresponding pulse width modulation signal as a fan control signal. In one embodiment, the fan control signal is a pulse width modulation signal, and the pulse width modulation value is, for example, a duty cycle increase, and the duty cycle increase is related to the fan The duty cycle of the control signal. In one embodiment, it is determined whether the changing trend of the processor load value shows an increasing trend based on at least one historical value of the processor load value within a set time. When the transformation trend is a gradually increasing trend and there is a negative value corresponding to the increase in the duty cycle generated within the set time, remove a plurality of negative values in the increase in the duty cycle; and remove the negative value according to the account The increase in the empty ratio generates the first pulse width modulation value. In an implementation aspect, when the energy consumption of the processor is greater than the set value, the current processor energy consumption (or the total energy consumption of the system) is compared with the processor consumption obtained at the previous moment (for example, the previous second). Energy (or the total energy consumption of the system) for comparison. When the current processor energy consumption (or the total energy consumption of the system) is greater than the processor energy consumption (or the total energy consumption of the system) obtained at the previous moment, it is judged as an increasing trend, and corresponding processing is performed.

Please refer back to step S603 in FIG. 6A again. As mentioned above, when it is determined in step S603 that the processor power load value of one of the two processors is greater than the load threshold value, step S627 is performed.

Please refer to FIG. 6B. In step S627, it is determined whether the processor temperature is less than the temperature threshold. The relevant details are similar to step S605, and will not be repeated here. When it is determined in step S627 that the processor temperature is less than the temperature threshold, step S631 is performed. When it is determined that the processor temperature is not less than the temperature threshold, step S629 is performed.

In step S629, the proportional coefficient is set according to the corresponding selected PID coefficient Is the third constant value, and set the integral coefficient to the first integral value. In this embodiment, the third constant value is 2, but not limited to this.

In step S631, the proportional coefficient is set as the fourth constant value according to the correspondingly selected PID coefficient, and the integral coefficient is set as the first integral value. In this embodiment, the fourth constant value is 6, but not limited to this.

In step S633, the current pulse width modulation value is generated according to the temperature difference value and the selected PID parameter.

In step S635, at least one historical pulse width modulation value and the current pulse width modulation value are averaged to generate a first pulse width modulation value. The relevant details are similar to step S621, and will not be repeated here.

In step S637, the first pulse width modulation value is compared with a plurality of second pulse width modulation values and the maximum value is obtained to generate a fan control signal to control the operation of the fan. The relevant details are similar to step S623, and will not be repeated here.

When entering step S625 from step S637, the pulse width modulation value selected in step S637 is output to the power module to generate a corresponding pulse width modulation signal as a fan control signal.

Steps S639 and S641 are further disclosed in FIG. 6C. In step S639, the operating temperature of at least one electronic component on the motherboard except the processor is obtained. In step S641, the aforementioned second pulse width modulation value is obtained according to the operating temperature of the at least one electronic component for use in step S623 and step S637.

Please refer to FIGS. 7A to 7F. FIG. 7A is a schematic diagram of the experimental result of the fan control method according to an embodiment of the present invention, and FIG. 7B is the experimental result of the fan control method according to a comparative embodiment. Fig. 7C is a schematic diagram of the experimental results of the fan control method according to another embodiment of the present invention, Fig. 7D is a schematic diagram of the experimental results of the fan control method according to another comparative embodiment, and Fig. 7E is In order to illustrate the experimental results of the fan control method according to another embodiment of the present invention, FIG. 7F is based on a pair of A schematic diagram of the experimental results of the fan control method shown in the embodiment. In FIGS. 7A to 7F, experiments are carried out by taking the processor A and the processor B on the motherboard as an example.

The measurement items corresponding to FIGS. 7A and 7B are to instantly increase the power consumption of the processor, so as to instantly increase the temperature of the processor to the upper limit of the operating temperature, so as to test the effect difference between the fan control method provided by the present invention and the conventional technology. FIG. 7A corresponds to the fan control method provided by the present invention, and FIG. 7B corresponds to the conventional technology. It can be seen from FIG. 7B that, under the conventional technology, the processor temperature curve has an obvious peak between the response time of 30 to 100, which is much higher than the steady state temperature, and is close to a system warning temperature T _jmax . The system warning temperature value T _{jmax is,} for example, the highest temperature at which the processor can operate normally. When the temperature of the processor is greater than the system warning temperature value T _jmax , the processor will be forced to reduce the frequency to reduce the processor temperature. At the same time, in FIG. 7B, the response time of the fan is relatively long, and the response speed is relatively slow. As shown in FIG. 7A, under the fan control method provided by the present invention, the processor temperature curve has no obvious peak temperature, and finally stabilizes at the desired target value, and the response time and response speed are far superior to the conventional technology. . In other words, the fan control method provided by the present invention can prevent the component from overheating due to the rapidly rising temperature when the power consumption changes drastically.

The measurement items corresponding to FIG. 7C and FIG. 7D are to first increase a part of the power consumption and then continue to slowly increase the processor power consumption, so as to gradually increase the processor temperature. As shown in Fig. 7D, the conventional technology has a slow response speed when the power consumption gradually changes, and the processor temperature curve has obvious peaks. By comparison, it can be seen that the overshoot of the processor temperature curve corresponding to the fan control method provided by the present invention is smaller than the overshoot of the conventional technology, and can respond to temperature changes more quickly.

Figure 7E and Figure 7F correspond to low power consumption tests. As shown in FIG. 7E and FIG. 7F, under the fan control method provided by the present invention, the stabilization time of the processor temperature curve is shorter, and the overshoot is also smaller.

In summary, the present invention provides a fan control method, which generates a fan control signal according to the largest of the first pulse width modulation value and the second pulse width modulation value. Wherein, the first pulse width modulation value is related to the processor power load and the processor temperature, and the second pulse width modulation value is related to the operating temperature of other electronic components on the motherboard. In this way, PID speed control and linear speed control are combined, and the advantages of PID speed control and linear speed control are combined, and there is no problem of slow response and waste of power consumption, which is quite practical.

Although the present invention is disclosed in the foregoing embodiments, it is not intended to limit the present invention. All changes and modifications made without departing from the spirit and scope of the present invention fall within the scope of the patent protection of the present invention. For the scope of protection defined by the present invention, please refer to the attached scope of patent application.

Claims (8)

A fan control method is applicable to a motherboard provided with a processor and electrically connected to a fan to dissipate the motherboard, including: determining whether a processor power load value of the processor is greater than a load threshold According to the value, a load judgment result is generated; it is judged whether a processor temperature of the processor is not greater than a temperature threshold value, and a temperature judgment result is generated accordingly; a temperature judgment result is selected according to the load judgment result and the temperature judgment result. A group of PID coefficients, the group of PID coefficients including a proportional coefficient and a corresponding integral coefficient; obtaining a temperature difference value of the processor, and generating a first pulse width modulation value according to the temperature difference value and the group of PID coefficients; and Receive a working temperature of at least one electronic component on the motherboard to calculate and generate a plurality of second pulse width modulation values, and compare the first pulse width modulation value with the plurality of second pulse width modulation values The maximum value is obtained to generate a fan control signal to control the operation of the fan. The fan control method according to claim 1, wherein when the load judgment result is no and the temperature judgment result is yes, the proportional coefficient is set to a first constant value according to the corresponding selected group of PID coefficients, and the The integral coefficient is a first integral value; when the load judgment result is no and the temperature judgment result is no, the proportional coefficient is set to a second constant value according to the corresponding selected group of PID coefficients, and the integral coefficient is set to The first integral value, wherein the first constant value and the second constant value are different values. The fan control method of claim 1, further comprising determining whether the temperature difference value is less than a temperature difference threshold; when the load determination result is no and the temperature determination result is yes, the temperature difference threshold is set to a first Temperature difference threshold value; when the temperature difference value is not less than the first temperature difference threshold value, adjust the value of the temperature difference value to the first temperature difference threshold value; when the load judgment result is no and the temperature judgment result is no, the temperature difference The threshold value is set as a second temperature difference threshold value; when the temperature difference value is not less than the second temperature difference threshold value, the value of the temperature difference value is adjusted to the second temperature difference threshold value; and the adjusted temperature difference value is compared with the group The PID coefficient generates the first pulse width modulation value. The fan control method according to claim 1, wherein, when the load judgment result is yes, different sets of the PID coefficients are selected according to the temperature judgment results to calculate and generate the first pulse width modulation value . The fan control method according to claim 1, wherein when the load judgment result is yes and the temperature judgment result is no, the proportional coefficient is set to a second constant value according to the corresponding selected group of PID coefficients, and set The integral coefficient is a first integral value. The fan control method according to claim 1, wherein when the load judgment result is yes and the temperature judgment result is yes, the proportional coefficient is set to a third constant value according to the corresponding selected group of PID coefficients, and set The integral coefficient is a first integral value. For the fan control method according to any one of claim 5 and claim 6, wherein the fan control signal is a pulse width modulation signal, the fan control method further includes: A duty cycle increase is generated according to the temperature difference value and the set of PID coefficients, and the duty cycle increase is related to the duty cycle of the fan control signal; according to a processor load value within a set time Determine whether the transformation trend of the processor load value shows an increasing trend; when the transformation trend is an increasing trend and there is a negative value corresponding to the increase in the duty cycle generated within the set time, remove the plural A negative value in the increase in the duty cycle; and the first pulse width modulation value is generated according to the increase in the duty cycle from which the negative value is removed. The fan control method according to claim 1, wherein the step of generating the first pulse width modulation value according to the temperature difference value and the set of PID coefficients further includes: generating according to the temperature difference value and the set of PID coefficients A current pulse width modulation value; and acquiring at least one historical pulse width modulation value signal, and averaging the at least one historical pulse width modulation value signal and the current pulse width modulation value to generate the first Pulse width modulation value.

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