CN109723664B - Method for controlling fan switch and controller thereof - Google Patents
Method for controlling fan switch and controller thereof Download PDFInfo
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- CN109723664B CN109723664B CN201711036504.9A CN201711036504A CN109723664B CN 109723664 B CN109723664 B CN 109723664B CN 201711036504 A CN201711036504 A CN 201711036504A CN 109723664 B CN109723664 B CN 109723664B
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Abstract
The invention discloses a method for controlling the on-off of a fan and a controller thereof, wherein the method comprises the following steps: determining target interval time of a switch of a fan when the switch of the fan is switched on twice, determining corresponding relation between the starting time of the switch and the heat dissipation effect of dissipating heat of a target device, wherein the target device is a device for dissipating heat of the fan, determining initial duty ratio for controlling the switch to be switched on according to the corresponding relation, and controlling the switch of the fan to be switched on and off according to the target interval time and the duty ratio. This application can realize guaranteeing fan heat dissipation function the time, reasonable control switch's life-span.
Description
Technical Field
The present application relates to the field of electrical equipment technology, and more particularly, to a method for controlling a fan switch and a controller thereof.
Background
At present, a heat dissipation fan is often installed inside an electrical appliance for heat dissipation inside the electrical appliance. The existing fan switch can be roughly divided into two modes: a constant temperature switch fan method and a timing switch fan method.
The method of switching the fan at a constant temperature may be to switch the fan on and off according to the temperature, to switch the fan on at a high temperature point, and to switch the fan off at a low temperature point. The fan control method is a common fan control method, for example, an energy storage battery cooling fan for industrial application, a switch relay has a certain service life, excessive consumption can cause that the switch relay cannot be closed or opened, long-time opening can excessively consume electric quantity, the energy utilization rate is very low, and a common method is a constant temperature switch fan. For another example, a method of switching a fan at a constant temperature is also widely adopted for heat dissipation of a notebook computer, heat dissipation of an induction cooker and the like which are common in families. The method is simple in implementation mode and high in universality, and can basically meet most working conditions. However, the fan cannot be switched on and off at a constant temperature, so that the damage and the aging of a switch cannot be accurately estimated, the accuracy can be increased only by experience and working condition tests, and the quality of a product cannot be effectively controlled; on the other hand, the unscientific definition of the switch temperature can cause the switch and the fan to be damaged quickly.
The method for turning on and off the fan in a timing mode can be a method for turning on and off the fan in a timing mode according to experience, such as turning on for three minutes and turning off for two minutes. For example, in an area with a large day-night temperature difference, due to the difference of the ambient temperature, the indoor unit can be turned on to dissipate heat in the morning, and turned off in the evening to realize the timing switch of the fan. The method has the advantages that the loss of the switching value and the fan can be confirmed, and the product quality can be effectively evaluated according to the characteristics of the switching value and the fan and by depending on the working condition test. The disadvantage is that the product cannot be effectively cooled in real time, and the fan may still be started at low temperature and stopped at high temperature. Thus, the function of the fan to dissipate heat is weakened.
In the control technology of the heat radiation fan, the following problems are mainly considered: heat dissipation function, ratio of power consumption to effect of the heat dissipation fan, life of the fan, and life of the switch. The fixed temperature switch fan cannot control the service life of the switch, so that the product type selection and the product maintenance are difficult. The timing switch fan heat dissipation function cannot achieve the best effect, and even if the switch service life is effectively controlled, the original heat dissipation function is reduced.
Disclosure of Invention
The application provides a method for controlling a fan switch and a controller thereof, which can reasonably control the service life of the switch while ensuring the heat dissipation function of the fan.
According to an aspect of the present application, a method for controlling a fan switch is provided, the method includes: determining target interval time of the switch of the fan when the switch of the fan is turned on twice, wherein the target interval time is the interval time of the switch of the fan when the switch of the fan is turned on twice; determining a corresponding relation between the starting time of the switch and a heat dissipation effect of dissipating heat of a target device, wherein the target device is a device for dissipating heat of a fan; determining an initial duty ratio for controlling the switch to be switched on according to the corresponding relation, wherein the initial duty ratio is used for simulating the ratio of the fan switching-on time to the target interval time; and controlling the on and off of the fan switch according to the target interval time and the duty ratio.
Optionally, as an embodiment of the present invention, the determining the target interval time of the switch of the fan when the switch of the fan is turned on twice adjacently includes: acquiring the effective use time T and the target use times N of a switch; and determining the target interval time delta T according to the effective use time and the target use times.
Optionally, as an embodiment of the present invention, the determining a correspondence between the starting time of the switch and a heat dissipation effect of dissipating heat of the target device includes: and when the highest limit temperature value at which the fan can operate is reached, starting a fan switch through an experiment to obtain the corresponding relation.
Alternatively, as an embodiment of the present invention, the heat dissipation effect is a reduction amount of a temperature value around the device after the fan is turned on.
Optionally, as an embodiment of the present invention, the following condition is satisfied when determining the initial duty ratio: and in a target interval time, the temperature of the device is less than the highest limit temperature value, and in the target interval time, the time for starting the fan is minimum, wherein the target interval time is the interval time between two adjacent starting of the switch of the fan.
Optionally, as an embodiment of the present invention, the determining, according to the correspondence, an initial duty ratio for controlling the switch to be turned on includes: simulating a switch of the fan to start for T1 time from a first temperature value and then to close for T2 time to obtain a simulated temperature, wherein T1+ T2 is equal to unit time; if the simulated temperature is higher than the first temperature value, the switch of the fan is simulated again, the switch of the fan is started for T3 time from the first temperature value and then is closed for T4 time, wherein T3 is larger than T1, and T3+ T4 is equal to unit time; if the simulated temperature is lower than the first temperature value, the switch of the fan is simulated again, the switch of the fan is started for T5 time from the first temperature value and then is closed for T6 time, wherein T5 is less than T1, and T5+ T6 is equal to unit time; and if the simulated temperature is equal to the first temperature value, obtaining that the initial duty ratio is T1/unit time.
Optionally, as an embodiment of the present invention, the first temperature value is a maximum limit temperature value at which the device can operate, or the first temperature value is the maximum limit temperature value at which the device can operate minus a temperature margin value.
Optionally, as an embodiment of the present invention, the method further includes: determining a target duty ratio according to the initial duty ratio, the initial duty ratio reliability, the ratio of the historical duty ratio to the previous time duty ratio; and controlling the on and off of the fan switch according to the target duty ratio.
Optionally, as an embodiment of the present invention, the duty ratio reliability is a ratio of a test operating condition and an actual operating condition that meet a temperature range in a unit time, and the last time duty ratio is an on time of the fan in a last unit time.
According to another aspect of the present application, a controller for controlling a fan switch includes: the device comprises a first determining unit, a second determining unit and a control unit, wherein the first determining unit is used for determining target interval time of a switch of a fan when the switch of the fan is turned on twice adjacent to each other; the second determining unit is used for determining the corresponding relation between the starting time of the switch and the heat dissipation effect of dissipating heat of a target device, wherein the target device is a device for dissipating heat of a fan; a third determining unit, configured to determine an initial duty cycle for controlling the switch to be turned on according to the correspondence determined by the second determining unit, where the initial duty cycle is a ratio of the simulated fan turn-on time to the target interval time; and the control unit is used for controlling the on and off of the fan switch according to the target interval time determined by the first determination unit and the duty ratio determined by the third determination unit.
Optionally, as an embodiment of the present invention, the first determining unit is specifically configured to obtain an effective usage time T and a target usage number N of the switch, and determine the target interval time δ T according to the effective usage time and the target usage number.
Optionally, as an embodiment of the present invention, the first determining unit is specifically configured to determine the target interval time δ T according to the following formula: and delta T is T/N.
Optionally, as an embodiment of the present invention, the second determining unit is specifically configured to, when the maximum limit temperature value at which the fan can operate is reached, turn on a fan switch through an experiment to obtain the corresponding relationship.
Alternatively, as an embodiment of the present invention, the heat dissipation effect is a reduction amount of a temperature value around the device after the fan is turned on.
Optionally, as an embodiment of the present invention, the following condition is satisfied when determining the initial duty ratio: and in a target interval time, the temperature of the device is less than the highest limit temperature value, and in the target interval time, the time for starting the fan is minimum, wherein the target interval time is the interval time between two adjacent starting of the switch of the fan.
Optionally, as an embodiment of the present invention, the third determining unit is specifically configured to: simulating a switch of the fan to start for T1 time from a first temperature value and then to close for T2 time to obtain a simulated temperature, wherein T1+ T2 is equal to unit time; if the simulated temperature is higher than the first temperature value, the switch of the fan is simulated again, the switch of the fan is started for T3 time from the first temperature value and then is closed for T4 time, wherein T3+ T4 is equal to unit time, and T3 is more than T1; if the simulated temperature is lower than the first temperature value, the switch of the fan is simulated again, the switch of the fan is started for T5 time from the first temperature value and then is closed for T6 time, wherein T5 is less than T1, and T5+ T6 is equal to unit time; and if the simulated temperature is equal to the first temperature value, obtaining that the initial duty ratio is T1/unit time.
Optionally, as an embodiment of the present invention, the first temperature value is a maximum limit temperature value at which the device can operate, or the first temperature value is the maximum limit temperature value at which the device can operate minus a temperature margin value.
Optionally, as an embodiment of the present invention, the controller further includes: the fourth determining unit is used for determining the target duty ratio according to the initial duty ratio, the reliability of the initial duty ratio, and the ratio of the historical duty ratio to the duty ratio of the last time; and the re-control unit is used for controlling the on and off of the fan switch according to the target duty ratio.
Optionally, as an embodiment of the present invention, the duty ratio reliability is a ratio of a test operating condition and an actual operating condition that meet a temperature range in a unit time, and the last time duty ratio is an on time of the fan in a last unit time.
According to the method for controlling the fan controller and the controller thereof, the opening and closing of the fan are controlled by considering the product quality of the fan switch, such as target interval time, and considering the heat dissipation effect of the product, so that a configurable control method suitable for the heat dissipation fan with various working conditions can be formed, and the service life of the switch and the heat dissipation function of the fan can be considered at the same time.
Drawings
Fig. 1 is a schematic flow chart of a method of controlling a fan switch according to one embodiment of the present invention.
FIG. 2 is a graph of temperature change for a switched mode fan under a given operating condition, according to one embodiment of the present invention.
Fig. 3 is a graph illustrating temperature variation over time obtained from a control switch on and then off test according to an embodiment of the present invention.
FIG. 4 is a graph of temperature versus time using only an initial duty cycle, in accordance with one embodiment of the present invention.
FIG. 5 is a graph of temperature versus time using only the initial duty cycle and with duty cycle adjustment after the first few units of time, in accordance with one embodiment of the present invention.
FIG. 6 is a graph illustrating a comparison of temperature versus time for different conditions, according to one embodiment of the present invention.
Fig. 7 is a schematic block diagram of a controller controlling a fan switch according to another embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A method of controlling a fan switch and a controller thereof according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a method of controlling a fan switch according to one embodiment of the present invention. The method may be performed by a controller that controls a fan switch.
And 101, determining the target interval time of the switch of the fan when the switch of the fan is switched on twice.
In one embodiment of the present invention, the time interval of the switch when the switch is turned on twice in the neighborhood, that is, the number of times the switch can be operated per unit time, can be obtained according to the quality characteristics of the switch and the target number of times the switch is used. It is easy to understand that the time interval between two adjacent times of opening of the switch and the number of times the switch can be operated in a unit time are reciprocal.
The target number of uses of the switch may refer to the life of the switch, e.g., the number of times the switch can be used.
Optionally, as an embodiment of the present invention, the determining the target interval time of the switch of the fan when the switch of the fan is turned on twice adjacently includes: and acquiring the effective use time T and the target use times N of the switch, and determining the target interval time delta T according to the effective use time and the target use times.
And 102, determining the corresponding relation between the starting time of the switch and the heat dissipation effect of dissipating heat of a target device, wherein the target device is a device for dissipating heat of a fan.
Optionally, as an embodiment of the present invention, the determining a correspondence between the starting time of the switch and a heat dissipation effect of dissipating heat of the target device includes: and when the highest limit temperature value at which the fan can operate is reached, starting a fan switch through an experiment to obtain the corresponding relation.
Theoretically, the maximum limit temperature at which the fan can operate may be a maximum temperature value at which a device product corresponding to the fan normally operates, and in practice, the maximum limit temperature may be a value obtained by reserving a certain difference value according to the maximum temperature value. For example, a 5% or 2 degree tolerance is reserved on the basis of the highest temperature value. The tolerance can be determined according to the conditions of temperature sampling error or rapid temperature rise when the power is too large, and the like, and also can be a value preset in advance for buffering near the highest temperature value, reserving a certain margin and avoiding reaching the highest temperature value.
Specifically, a temperature change curve of a product when the cooling fan is turned on and a temperature change curve of a device product when the cooling fan is turned off can be obtained through experiments.
Alternatively, as an embodiment of the present invention, the heat dissipation effect is a reduction amount of the temperature value around the device after the fan is turned on.
And 103, determining the initial duty ratio for controlling the switch to be switched on according to the corresponding relation.
Optionally, as an embodiment of the present invention, the following condition is satisfied when determining the initial duty ratio: and in the target interval time, the temperature of the device is less than the highest limit temperature value, and in the target interval time, the time for starting the fan is the minimum, wherein the target interval time is the interval time between two adjacent starting times of the switch of the fan.
Optionally, as an embodiment of the present invention, determining the initial duty ratio of the control switch according to the corresponding relationship includes: starting a switch of the simulation fan for T1 time from a first temperature value, and then closing the switch for T2 time to obtain a simulation temperature, wherein T1+ T2 is equal to unit time; if the simulated temperature is higher than the first temperature value, the switch of the fan is simulated again, the switch of the fan is started for T3 time from the first temperature value and then is closed for T4 time, wherein T3 is larger than T1, and T3+ T4 is equal to unit time; if the simulation temperature is lower than the first temperature value, opening a switch of the re-simulation fan for T5 time from the first temperature value, and then closing the switch for T6 time, wherein T5 is less than T1, and T5+ T6 is equal to unit time; if the simulated temperature is equal to the first temperature value, the initial duty cycle is T1/unit time. It should be understood that the analog temperature being equal to the first temperature value may be such that the analog temperature is approximately equal to the first temperature value, or is close enough to allow for a range of differences.
Optionally, as an embodiment of the present invention, the first temperature value may be a maximum limit temperature value at which the device can operate, or the first temperature value may be obtained by subtracting a temperature margin value from the maximum limit temperature value at which the device can operate, so as to buffer around the maximum temperature value, reserve a certain margin, and avoid reaching the maximum temperature value, so as to prevent various situations, such as a large sudden power, a too fast temperature increase exceeding the first temperature value, or avoid an influence caused by a deviation due to an unstable temperature sampling.
If T1 takes one more second to obtain a simulated temperature lower than the first temperature value and one less second to obtain a simulated temperature higher than the first temperature value, T1 may take one more second. A tool such as MATLEB may be used here to reduce the amount of manual computation.
And 104, controlling the on and off of the fan switch according to the target interval time and the duty ratio.
According to the method for controlling the fan controller and the controller thereof, the opening and closing of the fan are controlled by considering the product quality of the fan switch, such as target interval time, and considering the heat dissipation effect of the product, so that a configurable control method suitable for the heat dissipation fan with various working conditions can be formed, and the service life of the switch and the heat dissipation function of the fan can be considered at the same time.
Optionally, as an embodiment of the present invention, the method further includes: determining a target duty ratio according to the initial duty ratio, the initial duty ratio reliability, the ratio of the historical duty ratio to the previous time duty ratio; and controlling the on and off of the fan switch according to the target duty ratio.
Without a test data curve, the initial duty cycle may be conservatively located 95%, and if the initial duty cycle is unsupported by reliable test data, the initial duty cycle reliability CIPercent may be written as 0.
The initial duty ratio reliability may adopt the following setting method: in the environment temperature range, M (for example, M ═ 10) temperatures are averaged for testing, and N (for example, N ═ 5) power values are taken for product operation heating power for the following tests. And when M is 10 and N is 5, the total number of the working conditions is 50.
(1) The test is set to turn on cycle time and turn off (1-cycle) time per unit time interval. Wherein, TimeInterval is unit time, and Cycleitial is the initial duty cycle.
(2) And testing a plurality of (for example, more than 100) unit times in the working condition, and if the temperature in the plurality of unit times is tested to never exceed the maximum temperature, the initial duty cycle meets the requirement of the working condition.
(3) If 15 test working conditions do not exceed the highest temperature in a plurality of unit times, the reliability of the initial duty cycle is as follows: 15/(10 × 5) ═ 30%.
In an embodiment of the present invention, the duty ratio may be adjusted according to an actual working condition to obtain a target duty ratio. For example, the system is turned on for a period of time to reach the duty cycle time and then turned off, and a new target duty cycle can be reset every unit period. Specifically, the duty cycle of this unit time may adopt the following calculation formula:
the method includes the steps of (1) circulating, wherein circulating is initial duty ratio, CIPLCENT is initial duty ratio reliability, and circulating is the time of opening the fan in the last unit time.
In addition, if the temperature approaches the maximum limit temperature value, for example, the temperature is greater than 90% of the maximum limit temperature value, the switch can be turned on immediately and not turned off until the unit period is over even if the temperature drops. If the temperature is still close to the highest limit temperature value when the time for opening the switch according to the duty ratio is over, the fan switch is not closed so as to ensure the heat dissipation effect.
Optionally, as an embodiment of the present invention, the duty ratio reliability is a ratio of a test condition and an actual condition that meet a temperature range in a unit time, and the duty ratio of the last time is a turn-on time of the fan in the last unit time.
Because the test curve has certain deviation, and the temperature rise of the product under different working condition environments and the fan radiating effect have certain errors with the data obtained by the experimental environment, the duty ratio can be further dynamically adjusted to further reduce the errors. The initialized duty ratio and the duty ratio credibility can be used for the normal working condition that the actual running condition is not much different from the experimental condition. If the ambient temperature is the same, the heat dissipation condition of the device in the unit is basically similar to the condition of experimental simulation, and the working condition can be regarded as a normal working condition. The dynamic regulation duty ratio can be mainly used for unexpected working conditions, and if the actual environment temperature is higher than the experiment temperature and is larger than a certain value, the heat dissipation requirement is increased, or the heat dissipation condition of the unit where the device is located is good, the heat dissipation requirement is not large, or the duty ratio calculation under the condition of no test data is performed.
Next, a flow of a method for controlling a fan switch according to an embodiment of the present invention is illustrated with reference to fig. 2 to 6.
(1) Assuming that the calculated Timeinterval per unit time is 100s, the maximum limit temperature value is not more than 80 degrees, and the tolerance is 90%. The variation curve of the testing temperature of the fan for cooling or heating with time under the specified working condition of the device is shown in fig. 2.
From the test data of fig. 2, Matlab may be used to generate theoretical plot 3 of test temperature versus time after heat removal from 72 degrees (i.e., 80 x 90%) and then shut off within 1000 seconds. The open heat dissipation time is 611 seconds, and the initialization duty cycle is obtained to be 61.1%. Assuming that the test conditions met 10 of the 50 conditions, the duty cycle confidence level was 20%. The time 611 seconds for starting the heat dissipation may be the time for starting the cycle time interval using the above calculation formula, or may be generated using matlab software.
The actual operating condition is not ideal, and if the initial duty cycle is used to control the on or off of the switch, the temperature profile after control is shown in fig. 4, and the temperature can reach 82.85 degrees, and the maximum temperature value is exceeded.
Further, the duty cycle may be adjusted, in this example using the previous history cycle as Cyclehis, and the duty cycle for the next unit time is obtained by the following formula:
Cyclenow＝Cycleinital*CIPercent+Cyclehis*(1-CIPercent)。
the algorithm implements the 1 st actual turn-on duty cycle, which is 87.5%:
Cycle1＝61.1％*20％+87.5％*(1–20％)＝82.2％
the algorithm implements the 2 nd actual on duty cycle: cyclehis ═ 86%.
Cycle2＝61.1％*20％+86％*(1–20％)＝81％
The algorithm implements the 3 rd actual on duty cycle, 85.8%.
Cycle3＝61.1％*20％+85.8％*(1–20％)＝80.9％
The algorithm implements the 3 rd actual on duty cycle, Cyclehis 85.4%:
Cycle4＝61.1％*20％+85.4％*(1–20％)＝80.5％
continuing this calculation, the values of CycleN calculated basically later all stabilized at 80.5%, which are not written one by one here.
The above actual turn-on duty cycle is: the unit time opening reaches the time T1 when the algorithm is turned off, the temperature after the closing is greater than or equal to 72 degrees (assuming that the temperature tolerance is 90%, 80 × 90% — 72%), the algorithm is forced to be turned on again to the time T2 when the unit time is over, and the actual on duty ratio is (T1+ T2)/time interval.
The actual opening duty ratio is that the current duty ratio is used, the heat dissipation is forced to be opened due to overhigh temperature, the duty ratio of the algorithm is adjusted according to the actual opening duty ratio, and the optimal duty ratio value is slowly reached, namely the value is close to the minimum opening time and is not overhigh. By means of the algorithm, the temperature can be controlled within 72 degrees, and slowly approaches the duty ratio stable value.
FIG. 5 is a graph of temperature versus time using only the initial duty cycle and with duty cycle adjustment after the first few units of time, in accordance with one embodiment of the present invention. As can be seen from the comparison graph of the duty ratio fixing and the duty ratio adjusting and optimizing in FIG. 5, when the duty ratio fixing does not achieve the expected heat dissipation effect, the duty ratio can be adjusted in real time, so that the heat dissipation effect is better guaranteed.
FIG. 6 is a graph illustrating a comparison of temperature versus time for different conditions, according to one embodiment of the present invention. According to the working condition, the fixed temperature start and stop are simulated and compared, wherein the fixed temperature start and stop comprises the conditions that the heat radiation is started at 72 degrees and is closed at 55 degrees, and the heat radiation is closed at 72 degrees, and the conditions that the heat radiation is started at 72 degrees and is closed at 40 degrees. The comparative data are as follows:
the fixed temperature starts and stops control mode, can have different performances under different operating modes, consults fixed temperature in the table and stops the heat dissipation data.
Under the condition that the service life of the switch reaches the requirement (the switch is switched once every 1000s to ensure the service life of the switch), the power consumption of the fan (namely, the duty ratio is overlarge and the fan time is overlong) is relatively increased. Referring to "72 degrees on and 40 degrees off", 0.58 times, but the fan on time is increased by 17.1%, and the electricity waste is increased.
In the case of a short fan time, the number of switching operations increases, resulting in a shortened historical life. The reference of '72-degree opening and 55-degree stopping' is carried out for 3.75 times, so that the service life is greatly shortened, and the product is ensured differently.
The schematic diagram and the chart data show that different switch control modes under different working conditions have different switch service lives and different changes of the reached temperature along with time. Different switch control modes can be selected according to requirements.
The fan control algorithm can be used under various working conditions of industrial equipment, wherein the fan control algorithm is mainly used in a design environment with limited switch service life and certain requirements on fan service life and power consumption, and aims to enable the service life of a product to be measurable, so that the instability of the design and production after sale is reduced.
The algorithm of the cooling fan described above, any modification based on the method, falls within the scope of protection of the method.
In one embodiment of the invention, the switch control is mainly carried out based on the characteristics of the heat dissipation target device, and the fan switch is controlled by temperature sampling data and timing in consideration of the service life and the times of the switch. In other words, the specific embodiment of the invention comprehensively considers the actual heat dissipation requirements and controls the quality of the product accessories to form a configurable control algorithm of the heat dissipation fan, which is suitable for various working conditions. A control method of the cooling fan is generated by depending on actual use experience and software knowledge, so that not only can the product quality be met, but also the cooling function can be basically exerted.
Fig. 7 is a schematic block diagram of a controller controlling a fan switch according to another embodiment of the present invention.
The controller for controlling the fan switch of the embodiment of the present application includes a first determining unit 11, a second determining unit 12, a third determining unit 13, and a control unit 14.
The first determination unit 11 is used for determining the target interval time of the switch of the fan when the switch is turned on twice.
The second determining unit 12 is configured to determine a corresponding relationship between the starting time of the switch and a heat dissipation effect of dissipating heat of a target device, where the target device is a device for dissipating heat of a fan.
The third determining unit 13 is configured to determine an initial duty ratio for controlling the switch to be turned on according to the correspondence determined by the second determining unit.
The control unit 14 is configured to control the on and off of the fan switch according to the target interval time determined by the first determination unit and the duty ratio determined by the third determination unit.
According to the method for controlling the fan controller and the controller thereof, the opening and closing of the fan are controlled by considering the product quality of the fan switch, such as target interval time, and considering the heat dissipation effect of the product, so that a configurable control method suitable for the heat dissipation fan with various working conditions can be formed, and the service life of the switch and the heat dissipation function of the fan can be considered at the same time.
Optionally, as an embodiment of the present invention, the first determining unit is specifically configured to obtain an effective usage time T and a target usage number N of the switch, and determine the target interval time δ T according to the effective usage time and the target usage number.
Optionally, as an embodiment of the present invention, the first determining unit is specifically configured to determine the target interval time δ T according to the following formula: and delta T is T/N.
Optionally, as an embodiment of the present invention, the second determining unit is specifically configured to, when the maximum limit temperature value at which the fan can operate is reached, turn on a fan switch through an experiment to obtain the corresponding relationship.
Alternatively, as an embodiment of the present invention, the heat dissipation effect is a reduction amount of a temperature value around the device after the fan is turned on.
Optionally, as an embodiment of the present invention, the following condition is satisfied when determining the initial duty ratio: and in a target interval time, the temperature of the device is less than the highest limit temperature value, and in the target interval time, the time for starting the fan is minimum, wherein the target interval time is the interval time between two adjacent starting of the switch of the fan.
Optionally, as an embodiment of the present invention, the third determining unit is specifically configured to: simulating a switch of the fan to start for T1 time from a first temperature value and then to close for T2 time to obtain a simulated temperature, wherein T1+ T2 is equal to unit time; if the simulated temperature is higher than the first temperature value, the switch of the fan is simulated again, the switch of the fan is started for T3 time from the first temperature value and then is closed for T4 time, wherein T3 is larger than T1, and T3+ T4 is equal to unit time; if the simulated temperature is lower than the first temperature value, the switch of the fan is simulated again, the switch of the fan is started for T5 time from the first temperature value and then is closed for T6 time, wherein T5 is less than T1, and T5+ T6 is equal to unit time; and if the simulated temperature is equal to the first temperature value, obtaining that the initial duty ratio is T1/unit time.
Optionally, as an embodiment of the present invention, the first temperature value is a maximum limit temperature value at which the device can operate, or the first temperature value is the maximum limit temperature value at which the device can operate minus a temperature margin value.
Optionally, as an embodiment of the present invention, the controller further includes: the fourth determining unit is used for determining the target duty ratio according to the initial duty ratio, the reliability of the initial duty ratio, and the ratio of the historical duty ratio to the duty ratio of the last time; and the re-control unit is used for controlling the on and off of the fan switch according to the target duty ratio.
Optionally, as an embodiment of the present invention, the duty ratio reliability is a ratio of a test operating condition and an actual operating condition that meet a temperature range in a unit time, and the last time duty ratio is an on time of the fan in a last unit time.
The controller for controlling the fan switch of fig. 2 of the present application can execute the method for controlling the fan switch of fig. 1, and is not described in detail herein to avoid repetition.
Furthermore, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A method of controlling a fan switch, comprising:
determining the target interval time of the switch of the fan when the switch of the fan is switched on twice;
wherein the determining the target interval time of the switch of the fan when the switch of the fan is turned on twice comprises:
acquiring the effective use time T and the target use times N of a switch;
determining the target interval time delta T according to the effective use time and the target use times;
the target interval time δ T includes: δ T = T/N;
or, the determining the target interval time of the switch of the fan when the switch of the fan is turned on twice comprises:
determining the target time interval according to the reciprocal of the number of times that the switch of the fan can be operated in unit time;
determining a corresponding relation between the starting time of the switch and a heat dissipation effect of dissipating heat of a target device, wherein the target device is a device for dissipating heat of a fan;
determining an initial duty ratio for controlling the switch to be switched on according to the corresponding relation, wherein the following conditions are required to be met when the initial duty ratio is determined: in a target interval time, the temperature of the device is less than the highest limit temperature value capable of operating the fan, and in the target interval time, the time for starting the fan is minimum; the initial duty cycle is a ratio of the minimum fan on time to the target interval time under the condition; the target interval time is the interval time of the fan when the switch is turned on twice;
controlling the on and off of the fan switch according to the target interval time and the initial duty cycle, wherein the controlling the on and off of the fan switch according to the target interval time and the initial duty cycle specifically comprises:
determining a target duty ratio according to the ratio of an initial duty ratio, the reliability of the initial duty ratio, the historical duty ratio and the duty ratio of the last time, wherein the reliability of the initial duty ratio is the ratio of a test working condition and an actual working condition which accord with a temperature range in unit time, and the duty ratio of the last time is the starting time of the fan in the last unit time;
and controlling the on and off of the fan switch according to the target duty ratio.
2. The method of claim 1, wherein determining the correspondence between the activation time of the switch and the heat dissipation effect of dissipating heat from the target device comprises:
and when the highest limit temperature value at which the fan can operate is reached, starting a fan switch through an experiment to obtain the corresponding relation.
3. The method of claim 1 or 2, wherein the heat dissipation effect is a reduction in the temperature value around the device after the fan is turned on.
4. The method of claim 1, wherein determining an initial duty cycle for controlling the switch to turn on based on the correspondence comprises:
simulating a switch of the fan to start for T1 time from a first temperature value and then to close for T2 time to obtain a simulated temperature, wherein T1+ T2 is equal to unit time;
if the simulated temperature is higher than the first temperature value, the switch of the fan is simulated again, the switch of the fan is started for T3 time from the first temperature value and then is closed for T4 time, wherein T3 is larger than T1, and T3+ T4 is equal to unit time;
if the simulated temperature is lower than the first temperature value, the switch of the fan is simulated again, the switch of the fan is started for T5 time from the first temperature value and then is closed for T6 time, wherein T5 is less than T1, and T5+ T6 is equal to unit time;
and if the simulated temperature is equal to the first temperature value, obtaining that the initial duty ratio is T1/unit time.
5. The method of claim 4, wherein the first temperature value is a maximum limit temperature value at which the device can operate, or wherein the first temperature value is the maximum limit temperature value at which the device can operate minus a temperature margin value.
6. A controller for controlling the opening and closing of a fan, comprising:
the first determining unit is used for determining the target interval time of the switch of the fan when the switch of the fan is turned on twice;
the first determining unit is specifically configured to obtain an effective use time T and a target use number N of the switch; determining the target interval time delta T according to the effective use time and the target use times; the target interval time δ T includes: δ T = T/N;
or, the first determining unit is specifically configured to determine the target time interval according to a reciprocal of a number of times that the switch of the fan is operable in a unit time;
the second determining unit is used for determining the corresponding relation between the starting time of the switch and the heat dissipation effect of dissipating heat of a target device, wherein the target device is a device for dissipating heat of a fan;
a third determining unit, configured to determine an initial duty ratio for controlling the switch to be turned on according to the correspondence determined by the second determining unit, where the following conditions need to be satisfied when determining the initial duty ratio: in a target interval time, the temperature of the device is less than the highest limit temperature value capable of operating the fan, and in the target interval time, the time for starting the fan is minimum; the initial duty cycle is a ratio of the minimum fan on time to the target interval time under the condition; the target interval time is the interval time of the fan when the switch is turned on twice;
a control unit, configured to control turning on and off of the fan switch according to the target interval time determined by the first determining unit and the initial duty ratio determined by the third determining unit, where the controlling of turning on and off of the fan switch according to the target interval time determined by the first determining unit and the initial duty ratio determined by the third determining unit specifically includes:
the controller also comprises a fourth determining unit, which is used for determining a target duty ratio according to the initial duty ratio, the reliability of the initial duty ratio, the historical duty ratio and the duty ratio of the last time;
the reliability of the initial duty ratio is the ratio of a test working condition and an actual working condition which accord with a temperature range in unit time, and the duty ratio of the last time is the starting time of the fan in the last unit time;
and the re-control unit is used for controlling the on and off of the fan switch according to the target duty ratio.
7. The controller according to claim 6, wherein the second determining unit is specifically configured to obtain the corresponding relationship by turning on a fan switch through experiments when a maximum limit temperature value at which the fan can operate is reached.
8. The controller according to claim 6 or 7, wherein the heat dissipation effect is a reduction in the temperature value around the device after the fan is turned on.
9. The controller according to claim 6, wherein the third determination unit is specifically configured to:
simulating a switch of the fan to start for T1 time from a first temperature value and then to close for T2 time to obtain a simulated temperature, wherein T1+ T2 is equal to unit time;
if the simulated temperature is higher than the first temperature value, the switch of the fan is simulated again, the switch of the fan is started for T3 time from the first temperature value and then is closed for T4 time, wherein T3 is larger than T1, and T3+ T4 is equal to unit time;
if the simulated temperature is lower than the first temperature value, the switch of the fan is simulated again, the switch of the fan is started for T5 time from the first temperature value and then is closed for T6 time, wherein T5 is less than T1, and T5+ T6 is equal to unit time;
and if the simulated temperature is equal to the first temperature value, obtaining that the initial duty ratio is T1/unit time.
10. The controller of claim 9, wherein the first temperature value is a maximum limit temperature value at which the device is operable, or wherein the first temperature value is the maximum limit temperature value at which the device is operable minus a temperature margin value.
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| CN112445249B (en) * | 2019-09-03 | 2022-02-11 | 惠州拓邦电气技术有限公司 | High-precision temperature control method and device, storage medium and electronic equipment |
| CN113775607B (en) * | 2021-08-23 | 2022-09-02 | 中联重科股份有限公司 | Control method and control device for hydraulic oil cooling system and processor |
| CN113775606B (en) * | 2021-08-23 | 2022-08-05 | 中联重科股份有限公司 | Control method and control device for hydraulic oil cooling system and processor |
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