WO2022083187A1

WO2022083187A1 - Refrigeration fan control method and device, refrigeration apparatus, and storage medium

Info

Publication number: WO2022083187A1
Application number: PCT/CN2021/106902
Authority: WO
Inventors: 于帮兴; 曹洁; 樊炳国
Original assignee: Tcl家用电器（合肥）有限公司
Priority date: 2020-10-23
Filing date: 2021-07-16
Publication date: 2022-04-28
Also published as: CN112268405A

Abstract

A refrigeration fan control method and device, a refrigeration apparatus, and a storage medium. The refrigeration fan control method comprises: acquiring the current actual rotational speed of a refrigeration fan; and when the difference between the current actual rotational speed and a target rotational speed is greater than a preset difference, adjusting a drive signal input to the refrigeration fan, such that the difference between an output rotational speed of the refrigeration fan and the target rotational speed is less than or equal to the preset difference, wherein the drive signal is used to drive the refrigeration fan to rotate.

Description

Refrigeration fan control method, device, refrigeration equipment and storage medium

This application claims the priority of the Chinese patent application filed on October 23, 2020 with the application number 202011149417.6 and the invention titled "Control Method, Device, Refrigeration Equipment and Storage Medium for Refrigeration Fan", the entire contents of which are approved by Reference is incorporated in this application.

technical field

The present application relates to the technical field of refrigeration equipment, and in particular, to a control method, device, refrigeration equipment and storage medium for a refrigeration fan.

Background technique

With the rapid development of refrigeration equipment technology, how to stabilize the refrigeration performance of refrigeration equipment is becoming more and more important.

The cooling performance of refrigeration equipment is mainly achieved by cooling fans, such as refrigeration fans or condensing fans. At present, the cooling performance of the cooling fan is that the cooling fan adjusts the cooling performance of the cooling device to correspond to the cooling level selected by the user in response to the cooling level selected by the user.

However, the current cooling fan often has the problem of abnormal cooling performance.

technical problem

The present application provides a control method, device, refrigeration equipment and storage medium for a cooling fan, which can stabilize the cooling performance of the cooling fan.

technical solutions

In a first aspect, an embodiment of the present application provides a method for controlling a cooling fan, including:

Get the current actual speed of the cooling fan;

When the difference between the current actual speed and the target speed is greater than the preset difference, the drive signal input to the cooling fan is adjusted so that the difference between the speed output by the cooling fan and the target speed is less than or Equal to the preset difference, the drive signal is used to drive the cooling fan to rotate.

In the method, the adjusting the driving signal input to the cooling fan includes:

determining a target drive signal associated with the target rotational speed;

The drive signal is adjusted to the target drive signal.

In the method, the determining the target driving signal associated with the target rotational speed includes:

obtaining the current speed difference between the current actual speed and the target speed;

determining a target high level time in the target driving signal according to the current rotational speed difference;

The target driving signal is determined according to the target high level time and the signal period of the target driving signal.

In the method, the determining the target high level time in the target driving signal according to the current rotational speed difference includes:

determining the initial high level time in the target driving signal according to the current speed difference;

obtaining the standard high-level time interval corresponding to the initial high-level time;

The target high-level time is determined according to a comparison result between the initial high-level time and the standard high-level time interval.

determining the first high level time according to the current speed difference and a preset proportional coefficient;

Acquiring previous rotational speed differences, and using the sum of the current rotational speed difference and the previous rotational speed difference as the current cumulative error value;

determining the second high level time according to the current accumulated error value and a preset integral coefficient;

The target high time is determined according to the first high time and the second high time.

In the method, the determining the target high level time in the target driving signal according to the current rotational speed difference further includes:

determining the error difference between the current speed difference and the previous speed difference;

determining a third high level time according to the error difference and a preset differential coefficient;

The determining the target high-level time according to the first high-level time and the second high-level time includes:

The target high time is determined according to the first high time, the second high time and the third high time.

In the method, it also includes:

storing the correlation between the target rotational speed and the target driving signal;

When the rotational speed of the cooling fan is adjusted to the target rotational speed again, the associated target driving signal is searched according to the target rotational speed, and the cooling fan is driven to rotate based on the target driving signal.

In a second aspect, an embodiment of the present application provides a control device for a cooling fan, including:

The acquisition module is used to acquire the current actual speed of the cooling fan;

A feedback adjustment module, configured to adjust the drive signal input to the cooling fan when the difference between the current actual speed and the target speed is greater than a preset difference, so that the output speed of the cooling fan is the same as the target speed The difference in rotational speed is less than or equal to the preset difference, and the driving signal is used to drive the cooling fan to rotate.

In the device, the feedback adjustment module includes: a target drive signal determination unit and an adjustment unit;

the target drive signal determination unit, configured to determine a target drive signal associated with the target rotational speed;

The adjustment unit is configured to adjust the drive signal to the target drive signal.

In the device, the target drive signal determination unit includes: a current rotational speed difference value acquisition unit, a target high level time determination unit, and a target drive signal determination unit;

the current rotational speed difference obtaining unit, configured to obtain the current rotational speed difference between the current actual rotational speed and the target rotational speed;

The target high level time determination unit is configured to determine the target high level time in the target drive signal according to the current rotational speed difference, and the target high level time is one pulse period of the target drive signal the duration of the high level within;

The target driving signal determining unit is configured to determine the target driving signal according to the target high level time and the signal period of the target driving signal.

In the device, the target high level time determination unit includes: an initial high level time determination subunit, a standard high level time interval determination subunit, and a target high level time determination subunit;

The initial high-level time determination subunit is used to determine the initial high-level time in the target drive signal according to the current rotational speed difference, and the initial high-level time is the high level in one pulse period duration;

The standard high-level time interval determination subunit is used to obtain the standard high-level time interval corresponding to the initial high-level time;

The target high-level time determination subunit is configured to determine the target high-level time according to a comparison result between the initial high-level time and the standard high-level time interval.

In the device, the target high level time determination unit includes: a first high level time determination subunit, a current error accumulation value determination subunit, a second high level time determination subunit, and a target high level time determination subunit;

The first high-level time determination subunit is used to determine the first high-level time according to the current rotational speed difference and a preset proportional coefficient, and the first high-level time is the high level in one pulse period. The duration of the level, the scale factor is a factor in the scale algorithm;

The current error accumulation value determination subunit is used to obtain the previous rotational speed difference, and use the sum of the current rotational speed difference and the previous rotational speed difference as the current error accumulation value;

The second high-level time determination subunit is used to determine the second high-level time according to the current accumulated error value and the preset integral coefficient, and the second high-level time is the high level in one pulse period. The duration of the level, the integral coefficient is the coefficient in the integral algorithm;

The target high level time determination subunit is configured to determine the target high level time according to the first high level time and the second high level time.

In the device, the target high level time determination unit further includes: an error difference value determination subunit and a third high level time determination subunit;

the error difference determination subunit, used for determining the error difference between the current speed difference and the last speed difference;

The third high-level time determination subunit is used to determine the third high-level time according to the error difference value and the preset differential coefficient, and the third high-level time is the high-level time in one pulse period. the duration of the flat, the differential coefficients are coefficients in the differential algorithm;

The target high level time determination subunit is specifically used for:

In the device, the device further comprises: a storage module and a search module;

the storage module, configured to store the relationship between the target rotational speed and the target drive signal;

The searching module is configured to search for the associated target driving signal according to the target rotational speed when the rotational speed of the cooling fan is adjusted to the target rotational speed again, and drive the cooling fan to rotate based on the target driving signal .

In a third aspect, an embodiment of the present application provides a refrigeration device, which includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the steps of the foregoing method are implemented.

beneficial effect

The above-mentioned control method, device, refrigeration equipment and storage medium for a cooling fan include: acquiring the current actual speed of the cooling fan; when the difference between the current actual speed and the target speed is greater than a preset difference, adjusting the input to the The driving signal of the cooling fan, so that the difference between the output speed of the cooling fan and the target speed is less than or equal to the preset difference, and the driving signal is used to drive the cooling fan to rotate. When the difference between the current actual speed and the target speed is greater than the preset difference, the drive signal input to the cooling fan is adjusted so that the difference between the output speed of the cooling fan and the target speed is less than or equal to the preset difference. The error between the output speed of the cooling fan and the target speed is reduced, the problem of abnormal cooling performance caused by the excessive deviation between the output speed of the cooling fan and the target speed is avoided, and the cooling performance of the cooling fan is stabilized.

Description of drawings

FIG. 1 is a schematic flowchart of a method for controlling a cooling fan provided by an embodiment.

FIG. 2 is a detailed flowchart of step S130 in FIG. 1 provided in an embodiment.

FIG. 3 is a schematic flowchart of another method for controlling a cooling fan according to an embodiment.

FIG. 4 is a detailed flowchart of step S340 in FIG. 3 provided by an embodiment.

FIG. 5 is another detailed flowchart of step S340 in FIG. 3 provided by an embodiment.

FIG. 6 is a schematic flowchart of another method for controlling a cooling fan provided by an embodiment.

FIG. 7 is a schematic structural diagram of a control device for a cooling fan provided by an embodiment.

Embodiments of the present invention

In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the related drawings. Embodiments of the present application are presented in the accompanying drawings. However, the application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are for the purpose of describing specific embodiments only, and are not intended to limit the application.

It will be understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element.

As used herein, the singular forms "a," "an," and "the/the" can include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the terms "comprising/comprising" or "having" etc. designate the presence of stated features, integers, steps, operations, components, parts or combinations thereof, but do not preclude the presence or addition of one or more Possibilities of other features, integers, steps, operations, components, parts or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.

As mentioned in the background art, the refrigeration fans in the prior art have the problem of abnormal refrigeration performance. The inventors have found that the reason for this problem is that the air load of the refrigeration equipment is different or the assembly consistency is poor and/or the refrigeration equipment Aging, etc., which causes the actual speed of the cooling fan to deviate from the set speed too much, and the cooling performance cannot meet expectations, resulting in abnormal cooling performance.

Based on the above reasons, the present invention provides a control method, device, refrigeration equipment and storage medium for a cooling fan.

Referring to FIG. 1 , FIG. 1 is a schematic flowchart of a method for controlling a cooling fan according to an embodiment. As shown in FIG. 1, in one embodiment, a method for controlling a cooling fan is provided, the method comprising:

Step S110: Obtain the current actual rotational speed of the cooling fan.

Among them, the cooling fan refers to the fan on the refrigeration equipment for cooling. Specifically, the refrigeration equipment includes, but is not limited to, refrigerators, air conditioners, and other equipment with refrigeration capabilities. Refrigeration fans include but are not limited to refrigeration fans and condensing fans. Optionally, the cooling fan in this embodiment may be a brushless DC (Brushless DC). Direct Current, BLDC) motor. The current actual speed refers to the current speed of the cooling fan. Optionally, the current actual rotational speed in this embodiment may be acquired by a rotational speed sensor provided on the cooling fan. Optionally, before triggering this step, the current actual rotational speed of the cooling fan may be obtained by responding to the rotational speed switching instruction of the user and then according to the rotational speed switching instruction, so as to compare the current actual rotational speed with the target rotational speed to realize feedback adjustment.

In one embodiment, it can also be calculated from the collected rotational speed feedback signal and the attribute value of the cooling fan. The attribute value is used to characterize the corresponding relationship between the speed feedback signal and the speed. The speed feedback signal can be obtained by performing mathematical and logical operations on the electrical angle of the motor rotor of the cooling fan and the preset number of pulses per revolution. For example, the frequency of one pulse period of the speed feedback signal is PinLv, and the attribute value M is the corresponding relationship between the frequency and the speed, and the current actual speed of the cooling fan is PinLv*M. It can be understood that the current actual speed of the outlet fan is determined by collecting the speed feedback signal, which can be realized without additionally setting a speed sensor, which reduces the number of components associated with the cooling fan. Step S130, when the difference between the current actual speed and the target speed is greater than a preset difference, adjust the drive signal input to the cooling fan, so that the difference between the output speed of the cooling fan and the target speed is The value is less than or equal to the preset difference value, and the driving signal is used to drive the cooling fan to rotate.

The target rotational speed refers to the rotational speed to which it is expected to be adjusted, that is, the target rotational speed can be regarded as an expected rotational speed result. In this embodiment, when the difference between the current actual rotational speed and the target rotational speed is greater than the preset difference, the driving signal input to the cooling fan is feedback-adjusted. The size of the preset difference can be set as required, for example, set to a value above 0. Specifically, when the preset difference value is 0, the current actual speed is the same as the target speed, and the drive signal input to the cooling fan is fed back and adjusted; when the preset difference value is greater than 0, the current actual speed is within the target speed. Within the fluctuation range, for example, the current speed is within the target speed ± the preset difference, that is, when the current speed is within the range of (target speed - preset difference, target speed + preset difference), feedback and adjust the drive signal input to the cooling fan .

It should be noted that, the size of the preset difference can be set as required, for example, set to a value between 0 r/min (revolution per minute) - 30 r/min, which is not specifically limited in this embodiment. When the preset difference is smaller, the output speed of the cooling fan is more accurate. In one embodiment, optionally, the size of the preset difference is set according to the interval in which the target rotational speed is located. Specifically, when the target rotational speed is greater than the first threshold, for example, greater than 1000 r/min, the preset difference is the first value, and when the target rotational speed is less than the second threshold, the preset difference is the second value, where the first threshold is greater than or equal to the second threshold, the first value is greater than the second value. It can be understood that by determining different preset difference values according to the size of the target speed, a smaller target speed corresponds to a smaller preset difference, which avoids using an excessively large preset difference when the target speed is small, resulting in The difference between the output speed of the cooling fan and the target speed is too large.

The driving signal refers to a signal for driving the cooling fan to rotate. Specifically, the driving signal has a corresponding relationship with the output speed of the cooling fan. Therefore, by adjusting the driving signal input to the cooling fan by feedback of the current actual speed of the cooling fan, the output speed of the cooling fan can be consistent with or close to the target speed. Optionally, the driving signal is a PWM (Pulse width modulation, pulse width modulation) signal. Generally, the pulse period of the driving signal is fixed, and the high level time in one pulse period can be controlled to obtain different duty ratios of the driving signal to adjust the output speed of the cooling fan. Specifically, the working voltage of the cooling fan is different depending on the duty ratio. Generally, the larger the duty ratio, the higher the working voltage of the cooling fan. By obtaining different duty ratios of the driving signal, the working voltage of the cooling fan can be changed, thereby changing the output speed of the cooling fan. Exemplarily, the working voltage of the cooling fan = 12V*PwmOut/ Pwmperiod. Among them, PwmOut is the high level time of one pulse, and Pwmperiod is the period of one pulse.

In this embodiment, during the working process of the cooling fan, the current actual speed of the cooling fan is obtained; when the difference between the current actual speed and the target speed is greater than the preset difference, the input to the cooling fan is adjusted. drive signal, so that the difference between the rotational speed output by the cooling fan and the target rotational speed is less than or equal to the preset difference, by when the difference between the current actual rotational speed and the target rotational speed is greater than the preset difference, Adjust the drive signal input to the cooling fan, so that the difference between the output speed of the cooling fan and the target speed is less than or equal to the preset difference. Since the error between the output speed of the cooling fan and the target speed is reduced, refrigeration is avoided. Excessive deviation between the output speed of the fan and the target speed leads to abnormal cooling performance, which stabilizes the cooling performance of the cooling fan. In addition, by acquiring the current speed of the cooling fan in real time during the working process of the cooling fan and adjusting it, the difference between the output speed of the cooling fan and the target speed is less than or equal to the preset difference, which improves the accuracy of the speed control of the cooling fan sex. In addition, since the technical solution of this embodiment adjusts the driving signal by real-time feedback according to the current actual rotational speed of the cooling fan, it is not necessary to simulate and test the custom rotational speed values corresponding to different driving signals during development, which reduces the development steps. In addition, the technical solution of this embodiment adjusts the driving signal by real-time feedback according to the current actual speed of the cooling fan, so that it can be adjusted to any speed according to needs, not only limited to the speed on the table, but the rich and adjustable speed can be refined to 1r /min.

It should be noted that, the method of this embodiment may respond once every set time, that is, execute the technical solution of this embodiment once every set time. Optionally, the set time can be counted by a clock to determine whether the set time is reached. In addition, the technical solution of this implementation can be applied to the scenario where the output speed of the cooling fan has reached the target speed, but the difference between the output speed and the target speed is greater than the preset difference, and can also be applied to the cooling fan switching from the initial speed to the target speed In the process of rotating speed, the scene in which the method of this embodiment is used may be selected as required. It can be understood that if the technical solution of this embodiment is used in the process of increasing the cooling fan from the initial speed to the target speed, the adjustment process is more accurate, so that the output speed of the cooling fan is closer to the target speed, so that the cooling The result of fan switching is more accurate.

In a possible implementation manner, the feedback adjustment of the drive signal input to the cooling fan may be to adjust the rotation speed of the cooling fan according to a set duty cycle change degree, for example, increase or decrease the duty cycle according to 1%, and adjust cyclically until The difference between the rotational speed output by the cooling fan and the target rotational speed is less than or equal to the preset difference.

Referring to FIG. 2, FIG. 2 is a detailed flowchart of step S130 in FIG. 1 provided in an embodiment. In this embodiment, the step of adjusting the driving signal input to the cooling fan is further refined. In another possible implementation, the feedback adjustment of the drive signal input to the cooling fan may include:

Step S131 , determining a target driving signal associated with the target rotational speed.

Step S132: Adjust the drive signal to the target drive signal.

In this embodiment, since the driving signal has a corresponding relationship with the rotational speed output by the cooling fan, after determining the target driving signal related to the target rotational speed, the target driving signal is directly used as the driving signal input to the cooling fan, then the output of the cooling fan is The difference between the speed and the target speed is less than or equal to the preset difference. Compared with adjusting the rotation speed of the cooling fan according to the set change degree of the duty cycle, the present embodiment determines the target driving signal and directly uses the target driving signal as the input to the cooling fan, so that the cooling fan can quickly reach the target rotation speed and increase the speed of the cooling fan. The timeliness of the response to the target speed is improved.

Referring to FIG. 3 , FIG. 3 is a schematic flowchart of another method for controlling a cooling fan provided by an embodiment. This embodiment is a refinement of step S131 , the step of determining a target driving signal associated with the target rotational speed, on the basis of the above-mentioned embodiment. As shown in FIG. 3 , a control method of a cooling fan according to an embodiment includes:

Step S310: Obtain the current actual speed of the cooling fan.

For this step, reference may be made to the description of the foregoing embodiment, which is not repeated in this embodiment.

Step S330: When the difference between the current actual speed and the target speed is greater than a preset difference, obtain the current speed difference between the current actual speed and the target speed.

The current speed difference refers to the difference between the current actual speed and the target speed. For example, if the current actual speed is A and the target speed is B, the current speed difference EK is A-B.

Step S340: Determine a target high level time in the target driving signal according to the current rotational speed difference.

The target high level time refers to the high level duration of one pulse period in the target drive signal. The target high-level signal in this embodiment is obtained according to the current rotational speed difference.

Step S350: Determine the target driving signal according to the target high level time and the signal period of the target driving signal.

The signal period refers to the period of a pulse signal in the target driving signal. In this step, the target high level time is the duration of the high level within one pulse period of the target driving signal. Specifically, the pulse period of the driving signal is unchanged, then after the target high level time is determined, the duty cycle of the target driving signal can be determined according to the target high level time and the pulse period, so as to control the output speed of the cooling fan match the target speed.

Step S360: Adjust the drive signal to the target drive signal, so that the difference between the rotational speed output by the cooling fan and the target rotational speed is less than or equal to the preset difference, and the drive signal is used to drive The cooling fan rotates.

In this step, since the obtained target driving signal is associated with the target rotational speed, the driving signal is adjusted to the target driving signal, so that the difference between the output of the cooling fan and the target rotational speed is less than or equal to the rotational speed of the preset difference.

Referring to FIG. 4 , FIG. 4 is a detailed flowchart of step S340 in FIG. 3 provided by an embodiment. As shown in FIG. 4 , in one embodiment, determining the target high level time in the target driving signal according to the current rotational speed difference includes:

Step S341: Determine a first high level time according to the current rotational speed difference and a preset proportional coefficient.

Among them, the proportional coefficient refers to the coefficient in the proportional algorithm. The proportional algorithm reflects the deviation signal of the control system proportionally. Once the deviation occurs, it will immediately produce a control effect to reduce the deviation. Increasing the proportional coefficient makes the response more sensitive, the adjustment speed is faster, and the steady-state error can be reduced. However, if the proportional coefficient is too large, the overshoot will increase, the number of oscillations will increase, the adjustment time will be prolonged, and the dynamic performance will be deteriorated. If the proportional coefficient is too large, the closed-loop output will be unstable. The value of the proportional coefficient in this embodiment can be determined according to an experiment to determine a better value, and this embodiment does not limit the specific value of the proportional coefficient. The first high level time is determined according to the current speed difference and the proportional coefficient. Specifically, if the current rotational speed difference is EK and the proportional coefficient is KP, the first high level time Pout is EK*KP. The first high level time is the duration of the high level within one pulse period.

Step S342: Acquire the previous rotational speed difference, and use the sum of the current rotational speed difference and the previous rotational speed difference as the current cumulative error value.

Among them, the previous speed difference refers to the speed error generated before this feedback adjustment. Optionally, the previous rotational speed difference values in this embodiment may be all previous rotational speed differences, or may be part of the previous rotational speed differences. Part of the previous rotational speed differences may be the previous n previous rotational speed differences, where n is a natural number greater than 1. Specifically, if the previous rotational speed differences include EK_1, EK_2...EK_n, the current accumulated error value is EK+EK_1+EK_2+...+EK_n. It can be understood that the accumulated error value can also be saved each time the accumulated error value is calculated, and then in the next feedback adjustment, the sum of the current speed difference and the last accumulated error value can be directly calculated as the current accumulated error value, reducing The amount of computation is reduced, and the resource utilization is correspondingly reduced.

Step S343: Determine the second high level time according to the current accumulated error value and a preset integral coefficient.

Among them, the integral coefficient refers to the coefficient in the integral algorithm. The integral algorithm is mainly used to eliminate the static error and improve the indifference degree of the system. The integral algorithm is equivalent to periodically fine-tuning the second high level time of the drive signal according to the current speed difference, and the incremental value of the second high level time of each adjustment is proportional to the current speed difference. When the current actual speed is lower than the target speed, the error is positive, the integral term increases, so that the second high level time increases, otherwise the integral term decreases. So as long as the error is not zero, the drive signal will change continuously due to the integral action. The second high level time is determined according to the current accumulated error value and the integration coefficient. The numerical value of the integral coefficient in this embodiment can be determined according to an experiment to determine a better numerical value, and the specific numerical value of the integral coefficient is not limited in this embodiment. Specifically, if the current speed difference is SK and the proportional coefficient is KI, the second high level time Iout is SK*KI. The second high level time is the duration of the high level within one pulse period.

Step S344: Determine the target high level time according to the first high level time and the second high level time.

In this step, the target high level time can be determined according to the first high level time and the second high level time. Specifically, the target high level time is the sum of the first high level time Pout and the second high level time Iout. That is, the target high level time Pwmout=the first high level Pout+the second high level time Iout. In one embodiment, according to the importance of the proportional algorithm and the integral algorithm, a weighting coefficient may be configured for the first high-level time and the second high-level time, thereby improving the accuracy of adjusting the rotational speed of the fan. That is, the target high level time Pwmout=A1*the first high level Pout+ A2*the second high level time Iout, where A1 and A2 are weight coefficients, and A1+A2 =2. It can be understood that the higher the importance, the higher the configured weight factor.

In this embodiment, the first high-level time is determined by a proportional algorithm, and the second high-level time is determined by an integral algorithm, and the sum of the first high-level time and the second high-level time is taken as the target high-level time. Level time, since the proportional algorithm proportionally reflects the deviation signal of the control system and the integral algorithm is mainly used to eliminate the static error and improve the indifference degree of the system, the obtained target high level time corresponds to the target driving signal corresponding to the rotational speed more. Close to the target speed, improving the accuracy of adjusting to the target speed.

Referring to FIG. 5 , FIG. 5 is another detailed flowchart of step S340 in FIG. 3 provided by an embodiment. As shown in FIG. 5 , in another embodiment, determining the target high level time in the target driving signal according to the current rotational speed difference includes:

Step S345: Determine the error difference between the current rotational speed difference and the previous rotational speed difference.

Among them, the last speed difference refers to the speed error generated by the last feedback adjustment. The error difference refers to the difference between the current speed difference and the previous speed difference. Specifically, if the current speed difference is EK and the previous speed difference is EK_1, then the error difference = EK-EK_1.

Step S346: Determine a third high level time according to the error difference and a preset differential coefficient.

Among them, the differential coefficient refers to the coefficient in the differential algorithm. Closed-loop feedback control may suffer from instability problems due to the large hysteresis factor. Since the differential algorithm can predict the trend of the error change, the effect of this prediction can offset the influence of the lag factor. Appropriate differential control adjustment amount is reduced to increase the stability of closed-loop control. Adding a differential algorithm can improve the dynamic characteristics of the system during the adjustment process. The numerical value of the differential coefficient in this embodiment can be determined according to an experiment to determine a better numerical value, and the specific numerical value of the differential coefficient is not limited in this embodiment. Specifically, if the proportional coefficient is KD and the error difference value=EK-EK_1, the third high level time Dout is KD*(EK-EK_1). The third high level time is the duration of the high level within one pulse period.

Step S347: Determine the target high level time according to the first high level time, the second high level time and the third high level time.

In this step, the target high level time is determined according to the first high level time, the second high level time and the third high level time. Specifically, the target high level time is the sum of the first high level Pout, the second high level time Iout and the third high level time Dout, that is, the target high level time Pwmout=the first high level Pout+the second high level time High level time Iout+third high level time Dout. In one embodiment, a weight coefficient may be configured for the first high level time, the second high level time and the third high level time according to the importance of the proportional algorithm, the integral algorithm and the differential algorithm, so as to improve the adjustment Accuracy of fan speed. That is, target high level time Pwmout=A1*first high level Pout+ A2*second high level time Iout+ A3*third high level time Dout, where A1, A2 and A3 are weight coefficients, A1+A2+A3 =3.

In this embodiment, the target high-level time is determined by combining the differential algorithm. Since the differential algorithm can predict the trend of error change, the adjustment amount can be reduced to increase the stability of the closed-loop control.

In one embodiment, determining the target high level time in the target driving signal according to the current rotational speed difference includes:

The initial high level time in the target driving signal is determined according to the current rotational speed difference. Obtain the standard high-level time interval corresponding to the initial high-level time. The target high-level time is determined according to a comparison result between the initial high-level time and the standard high-level time interval.

In this embodiment, the initial high level time is the high level time determined according to the current error rotation speed, which is directly related to the current rotation speed difference, that is, the initial high level time is the direct result of calculation according to the current error rotation speed. The initial high level time is the duration of the high level within one pulse period. Optionally, the initial high-level time includes, but is not limited to, at least one of a first initial high-level time, a second initial high-level time, a third initial high-level time, and a target initial high-level time. The comparison result refers to the result of comparing the initial high-level time with the standard high-level time interval. Specifically, the standard high-level time interval corresponds to the initial high-level time, and the standard high-level time interval has an upper limit value and a lower limit value. If the initial high-level time is within the interval between the upper limit and the lower limit, the initial high-level time is used as the corresponding high-level time to determine the target high-level time; if the initial high-level time is at the upper limit If the initial high level time is below the lower limit value, the lower limit value is used as the corresponding high level time. to determine the target high time.

For example, if the initial high-level time includes the first initial high-level time, the first initial high-level time is Pout=EK*KP, and the corresponding standard high-level time interval is (PoutMin, PoutMax). If PoutMin≤Pout≤PoutMax, take Pout as the first high level time; if PoutMax≤Pout, take PoutMax as the first high level time; if Pout≤PoutMin, take PoutMin as the first high level time. Specifically, in order to prevent the value output by the proportional algorithm from being too small or too large, a lower limit value PoutMin and an upper limit value PoutMax are set.

Similarly, if the initial high-level time includes the second initial high-level time, the second initial high-level time is Iout, and the corresponding standard high-level time interval is (IoutMin, IoutMax), if IoutMin≤Iout≤IoutMax , then Iout is taken as the second high level time; if IoutMax≤Iout, then IoutMax is taken as the second high level time; if Iout≤IoutMin, then IoutMin is taken as the second high level time. Specifically, in order to avoid that the value output by the integral algorithm is too small or too large, which may cause oscillation or slow adjustment of the system, the lower limit value IoutMin and the upper limit value IoutMax are set.

Similarly, if the initial high-level time includes the third initial high-level time, the third initial high-level time is Dout, and the corresponding standard high-level time interval is (DoutMin, DoutMax), if DoutMin≤Dout≤DoutMax , Dout is taken as the third high level time; if DoutMax≤Dout, DoutMax is taken as the third high level time; if Dout≤DoutMin, DoutMin is taken as the third high level time. Specifically, in order to avoid that the value output by the differential algorithm is too small or too large, causing system adjustment oscillation or adjustment too slow, a lower limit value DoutMin and an upper limit value DoutMax are set.

Similarly, if the initial high level time includes the target initial high level time, the target initial high level time is Pwmout, and the corresponding standard high level time interval is (PwmoutMin, PwmoutMax). If PwmoutMin≤Pwmout≤PwmoutMax, take Pwmout as the target high level time; if PwmoutMax≤Pwmout, take PwmoutMax as the target high level time; if Pwmout≤PwmoutMin, take PwmoutMin as the target high level time. Specifically, in order to avoid excessive feedback adjustment, resulting in unstable adjustment process, a lower limit value PwmoutMin and an upper limit value PwmoutMax are set. The target initial high level time is the accumulation of the first high level time and the second high level time, or the accumulation of the first high level time, the second high level time and the third high level time.

It should be noted that, the matching of the signal included in the initial high-level signal and the corresponding standard high-level signal interval may be set as required, which is not specifically limited in this embodiment.

Referring to FIG. 6 , FIG. 6 is a schematic flowchart of another method for controlling a cooling fan provided by an embodiment.

Step S610, acquiring the current actual rotational speed of the cooling fan.

For this step, reference may be made to the description of any of the foregoing embodiments, which is not repeated in this embodiment.

Step S630, when the difference between the current actual speed and the target speed is greater than a preset difference, adjust the drive signal input to the cooling fan, so that the difference between the output speed of the cooling fan and the target speed is The value is less than or equal to the preset difference value, and the driving signal is used to drive the cooling fan to rotate.

Step S640: Store the correlation between the target rotational speed and the target driving signal.

The association relationship refers to the binding relationship between the target rotational speed and the target driving signal. Specifically, after the target driving signal is determined, the target rotational speed and the target driving signal can be associated and stored, and when the rotational speed of the cooling fan needs to be adjusted to the same target rotational speed again, the target rotational speed associated with the target rotational speed can be searched according to the correlation relationship. signal, so as to control the rotation of the cooling fan with the target driving signal.

Step S650: When the rotational speed of the cooling fan is adjusted to the target rotational speed again, the associated target driving signal is searched according to the target rotational speed, and the cooling fan is driven to rotate based on the target driving signal.

In this step, the target driving signal associated with the target rotational speed is searched according to the correlation relationship, so as to control the rotation of the cooling fan with the target driving signal.

In this embodiment, after the target driving signal is determined, the target rotational speed and the target driving signal can be stored in association, and when the rotational speed of the cooling fan needs to be adjusted to the same target rotational speed again, the correlation of the target rotational speed can be searched according to the correlation relationship Therefore, the rotation of the cooling fan is controlled by the target driving signal, and the above step of determining the target driving signal does not need to be re-executed, which reduces the resource occupancy rate of the feedback adjustment.

It should be understood that although the steps in the flowcharts of FIGS. 1 to 6 are sequentially displayed according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, the execution of these steps is not strictly limited to the order, and these steps may be performed in other orders. Moreover, at least a part of the steps in FIG. 1 to FIG. 6 may include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but may be executed at different times. The order of execution is also not necessarily sequential, but may be performed alternately or alternately with other steps or at least a portion of the steps or stages within the other steps.

Referring to FIG. 7 , FIG. 7 is a schematic structural diagram of a control device for a cooling fan provided by an embodiment. In one embodiment, as shown in FIG. 7, a control device 700 for a cooling fan is provided, including: an acquisition module 710 and a feedback adjustment module 730, wherein:

The obtaining module 710 is configured to obtain the current actual rotational speed of the cooling fan. The feedback adjustment module 730 is configured to adjust the drive signal input to the cooling fan when the difference between the current actual speed and the target speed is greater than the preset difference, so that the output speed of the cooling fan is the same as the target speed. The difference in rotational speed is less than or equal to the preset difference, and the driving signal is used to drive the cooling fan to rotate.

In one embodiment, the feedback adjustment module 730 includes: a target drive signal determination unit, configured to determine a target drive signal associated with the target rotational speed; and an adjustment unit, configured to adjust the drive signal to the target drive signal.

In one embodiment, the target driving signal determination unit includes: a current rotational speed difference obtaining unit, configured to obtain a current rotational speed difference between the current actual rotational speed and the target rotational speed; a target high level time determination unit, configured to The current rotational speed difference determines a target high level time in the target drive signal; a target drive signal determination unit is configured to determine the target drive according to the target high level time and a signal period of the target drive signal Signal.

In one embodiment, the target high-level time determination unit includes: an initial high-level time determination subunit, which determines the initial high-level time in the target driving signal according to the current rotational speed difference; standard high-level time The interval determination subunit is used to obtain the standard high level time interval corresponding to the initial high level time; the target high level time determination subunit is used to obtain the standard high level time interval according to the initial high level time and the standard high level The comparison result of the time interval determines the target high level time.

In one embodiment, the target high-level time determination unit includes: a first high-level time determination subunit, configured to determine the first high-level time according to the current rotational speed difference and a preset proportional coefficient; the current error The cumulative value determination subunit is used to obtain the previous rotational speed difference value, and the sum of the current rotational speed difference value and the previous rotational speed difference value is used as the current error cumulative value; the second high level time determination subunit is used for according to The current error accumulation value and the preset integral coefficient determine the second high level time; the target high level time determination subunit is used for determining according to the first high level time and the second high level time the target high time.

In one embodiment, the target high level time determination unit further includes: an error difference value determination subunit, configured to determine the error difference value between the current speed difference value and the previous speed difference value; the third high level time determination a subunit, configured to determine the third high level time according to the error difference value and the preset differential coefficient; the subunit for determining the target high level time is further configured to The high time and the third high time determine the target high time.

In one embodiment, the control device 700 further includes: a storage module for storing the correlation between the target rotational speed and the target driving signal; a search module for adjusting the rotational speed of the cooling fan to the desired value again when When the target rotational speed is determined, the associated target driving signal is searched according to the target rotational speed, and the cooling fan is driven to rotate based on the target driving signal.

For the specific limitation of the control device of the cooling fan, reference may be made to the limitation on the control method of the cooling fan above, which will not be repeated here. All or part of the modules in the control device for the cooling fan can be implemented by software, hardware and combinations thereof. The above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or stored in the memory in the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules. It should be noted that, the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation.

In one embodiment, a computer device is provided, including a memory and a processor, where a computer program is stored in the memory, and the processor implements the steps in the foregoing method embodiments when the processor executes the computer program.

In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, implements the steps in the foregoing method embodiments.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage In the medium, when the computer program is executed, it may include the processes of the above-mentioned method embodiments. Wherein, any reference to memory, storage, database or other media used in the various embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (Read-Only Memory, ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory may include random access memory (Random Access Memory) Access Memory, RAM) or external cache memory. By way of illustration and not limitation, RAM may take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (Dynamic Random Access Memory). Access Memory, DRAM), etc.

In the description of this specification, reference to the description of the terms "some embodiments," "other embodiments," "ideal embodiments," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in the present specification. at least one embodiment or example of the invention. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, all It is considered to be the range described in this specification.

The above-mentioned embodiments only represent several embodiments of the present application, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the scope of protection of the patent of the present application shall be subject to the appended claims.

Claims

A control method of a cooling fan, comprising:

Get the current actual speed of the cooling fan;

When the difference between the current actual speed and the target speed is greater than the preset difference, the drive signal input to the cooling fan is adjusted so that the difference between the speed output by the cooling fan and the target speed is less than or Equal to the preset difference, the drive signal is used to drive the cooling fan to rotate.
The method of claim 1, wherein the adjusting the driving signal input to the cooling fan comprises:

determining a target drive signal associated with the target rotational speed;

The drive signal is adjusted to the target drive signal.
The method of claim 2, wherein the determining a target driving signal associated with the target rotational speed comprises:

obtaining the current speed difference between the current actual speed and the target speed;

Determine the target high level time in the target drive signal according to the current rotational speed difference, and the target high level time is the duration of the high level in one pulse period of the target drive signal;

The target driving signal is determined according to the target high level time and the signal period of the target driving signal.
The method of claim 3, wherein the determining the target high level time in the target driving signal according to the current rotational speed difference comprises:

Determine the initial high level time in the target drive signal according to the current rotational speed difference, where the initial high level time is the duration of the high level in one pulse period;

obtaining the standard high-level time interval corresponding to the initial high-level time;

The target high-level time is determined according to a comparison result between the initial high-level time and the standard high-level time interval.
The method of claim 3, wherein the determining the target high level time in the target driving signal according to the current rotational speed difference comprises:

The first high-level time is determined according to the current speed difference and a preset proportional coefficient, the first high-level time is the duration of the high-level in one pulse cycle, and the proportional coefficient is a value in the proportional algorithm. coefficient;

Acquiring previous rotational speed differences, and using the sum of the current rotational speed difference and the previous rotational speed difference as the current cumulative error value;

The second high-level time is determined according to the current accumulated error value and the preset integration coefficient, the second high-level time is the duration of the high-level in one pulse period, and the integration coefficient is in the integration algorithm coefficient;

The target high time is determined according to the first high time and the second high time.
The method of claim 5, wherein the determining the target high level time in the target driving signal according to the current rotational speed difference further comprises:

determining the error difference between the current speed difference and the previous speed difference;

The third high level time is determined according to the error difference value and the preset differential coefficient, the third high level time is the duration of the high level in one pulse period, and the differential coefficient is the coefficient;

The determining the target high-level time according to the first high-level time and the second high-level time includes:

The target high time is determined according to the first high time, the second high time and the third high time.
The method of claim 2, wherein the method further comprises:

storing the correlation between the target rotational speed and the target driving signal;

When the rotational speed of the cooling fan is adjusted to the target rotational speed again, the associated target driving signal is searched according to the target rotational speed, and the cooling fan is driven to rotate based on the target driving signal.
A control device for a cooling fan, comprising:

The acquisition module is used to acquire the current actual speed of the cooling fan;

A feedback adjustment module, configured to adjust the drive signal input to the cooling fan when the difference between the current actual speed and the target speed is greater than a preset difference, so that the output speed of the cooling fan is the same as the target speed The difference in rotational speed is less than or equal to the preset difference, and the driving signal is used to drive the cooling fan to rotate.
The apparatus of claim 8, wherein the feedback adjustment module comprises: a target driving signal determination unit and an adjustment unit;

the target drive signal determination unit, configured to determine a target drive signal associated with the target rotational speed;

The adjustment unit is configured to adjust the drive signal to the target drive signal.
The apparatus of claim 9, wherein the target drive signal determination unit comprises: a current rotational speed difference value acquisition unit, a target high level time determination unit, and a target drive signal determination unit;

the current rotational speed difference obtaining unit, configured to obtain the current rotational speed difference between the current actual rotational speed and the target rotational speed;

The target high level time determination unit is configured to determine the target high level time in the target drive signal according to the current rotational speed difference, and the target high level time is one pulse period of the target drive signal the duration of the high level within;

The target driving signal determining unit is configured to determine the target driving signal according to the target high level time and the signal period of the target driving signal.
The apparatus of claim 10, wherein the target high-level time determination unit comprises: an initial high-level time determination subunit, a standard high-level time interval determination subunit, and a target high-level time determination subunit ;

The initial high-level time determination subunit is used to determine the initial high-level time in the target drive signal according to the current rotational speed difference, and the initial high-level time is the high level in one pulse period duration;

The standard high-level time interval determination subunit is used to obtain the standard high-level time interval corresponding to the initial high-level time;

The target high-level time determination subunit is configured to determine the target high-level time according to a comparison result between the initial high-level time and the standard high-level time interval.
The apparatus according to claim 10, wherein the target high-level time determining unit comprises: a first high-level time determining subunit, a current error accumulation value determining subunit, and a second high-level time determining subunit, And the target high level time determination subunit;

The first high-level time determination subunit is used to determine the first high-level time according to the current rotational speed difference and a preset proportional coefficient, and the first high-level time is the high level in one pulse period. The duration of the level, the scale factor is a factor in the scale algorithm;

The current error accumulation value determination subunit is used to obtain the previous rotational speed difference, and use the sum of the current rotational speed difference and the previous rotational speed difference as the current error accumulation value;

The second high-level time determination subunit is used to determine the second high-level time according to the current accumulated error value and the preset integral coefficient, and the second high-level time is the high level in one pulse period. The duration of the level, the integral coefficient is the coefficient in the integral algorithm;

The target high level time determination subunit is configured to determine the target high level time according to the first high level time and the second high level time.
The apparatus of claim 12, wherein the target high level time determination unit further comprises: an error difference value determination subunit and a third high level time determination subunit;

the error difference determination subunit, used for determining the error difference between the current speed difference and the last speed difference;

The third high-level time determination subunit is used to determine the third high-level time according to the error difference value and the preset differential coefficient, and the third high-level time is the high-level time in one pulse period. the duration of the flat, the differential coefficients are coefficients in the differential algorithm;

The target high level time determination subunit is specifically used for:

The target high time is determined according to the first high time, the second high time and the third high time.
The apparatus of claim 9, wherein the apparatus further comprises: a storage module and a search module;

the storage module, configured to store the relationship between the target rotational speed and the target drive signal;

The searching module is configured to search for the associated target driving signal according to the target rotational speed when the rotational speed of the cooling fan is adjusted to the target rotational speed again, and drive the cooling fan to rotate based on the target driving signal .
A refrigeration device includes a memory and a processor, wherein the memory stores a computer program, wherein the processor implements the following steps when executing the computer program:

Get the current actual speed of the cooling fan;

When the difference between the current actual speed and the target speed is greater than the preset difference, the drive signal input to the cooling fan is adjusted so that the difference between the speed output by the cooling fan and the target speed is less than or Equal to the preset difference, the drive signal is used to drive the cooling fan to rotate.
The apparatus of claim 15, wherein the processor is specifically configured to:

determining a target drive signal associated with the target rotational speed;

The drive signal is adjusted to the target drive signal.
The device of claim 16, wherein the processor is further configured to:

obtaining the current speed difference between the current actual speed and the target speed;

Determine the target high level time in the target drive signal according to the current rotational speed difference, and the target high level time is the duration of the high level in one pulse period of the target drive signal;

The target driving signal is determined according to the target high level time and the signal period of the target driving signal.
The device of claim 17, wherein the processor is further configured to:

Determine the initial high level time in the target drive signal according to the current rotational speed difference, where the initial high level time is the duration of the high level in one pulse period;

obtaining the standard high-level time interval corresponding to the initial high-level time;

The target high-level time is determined according to a comparison result between the initial high-level time and the standard high-level time interval.
The device of claim 17, wherein the processor is further configured to:

The first high-level time is determined according to the current speed difference and a preset proportional coefficient, the first high-level time is the duration of the high-level in one pulse cycle, and the proportional coefficient is a value in the proportional algorithm. coefficient;

Acquiring previous rotational speed differences, and using the sum of the current rotational speed difference and the previous rotational speed difference as the current cumulative error value;

The second high-level time is determined according to the current accumulated error value and the preset integration coefficient, the second high-level time is the duration of the high-level in one pulse period, and the integration coefficient is in the integration algorithm coefficient;

The target high time is determined according to the first high time and the second high time.
A computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the method of any one of claims 1 to 7.