CN113464480B - Fan control method and system - Google Patents
Fan control method and system Download PDFInfo
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- CN113464480B CN113464480B CN202110931343.XA CN202110931343A CN113464480B CN 113464480 B CN113464480 B CN 113464480B CN 202110931343 A CN202110931343 A CN 202110931343A CN 113464480 B CN113464480 B CN 113464480B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/02—Controlling of coolant flow the coolant being cooling-air
- F01P7/04—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
- F01P7/048—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio using electrical drives
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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The embodiment of the invention provides a control method and a system for a fan. The method comprises the following steps: setting a first control variable as a temperature difference value, wherein the temperature difference value is a difference value between the real-time limit temperature of the heat source component group and the safety temperature of the heat source component group; judging whether the first control variable is smaller than or equal to zero; if the first control variable is less than or equal to zero, acquiring a first heating speed of the heat source component group; judging whether the first heating rate is greater than or equal to a heating threshold; and if the first temperature rising speed is larger than or equal to the temperature rising threshold value, adjusting the air supply quantity of the fan. According to the embodiment of the invention, the air supply quantity of the fan is controlled in a variable frequency and variable pressure mode, so that the energy consumption can be reduced, and the comfort level of the whole vehicle can be improved.
Description
[ field of technology ]
The embodiment of the invention relates to the technical field of automobiles, in particular to a control method and a system of a fan.
[ background Art ]
The automobile cooling fan is used as a heat radiating device of an automobile front cabin and mainly plays a role in cooling main heat source devices such as an engine and the like. The existing cooling fan mainly adopts three-gear control or duty ratio control, and only the proportion of the power-on time to the total time in one cycle period is controlled without changing the frequency and the voltage of a driving power supply, so that the air supply quantity is higher than the actually required air supply quantity in many times, the energy waste is caused, the energy saving requirement is not facilitated, and the comfort level of the whole vehicle is affected.
[ invention ]
In view of this, the embodiment of the invention provides a method and a system for upgrading a controller, which are used for controlling the air supply quantity of a fan in a variable frequency and variable pressure mode, so that the energy consumption can be reduced and the comfort level of the whole vehicle can be improved.
In a first aspect, an embodiment of the present invention provides a method for controlling a fan, where the method includes:
setting a first control variable as a temperature difference value, wherein the temperature difference value is a difference value between a real-time limit temperature of the heat source component group and a safe temperature of the heat source component group;
judging whether the first control variable is smaller than or equal to zero;
if the first control variable is judged to be smaller than or equal to zero, a first heating speed of the heat source component group is obtained;
judging whether the first temperature rising speed is greater than or equal to a temperature rising threshold value;
and if the first temperature rising speed is larger than or equal to the temperature rising threshold value, adjusting the air supply quantity of the fan.
In one possible implementation, the method further includes:
and if the first control variable is judged to be larger than zero, adjusting the air supply quantity of the fan.
In one possible implementation, after the adjusting the air supply amount of the fan, the step of setting the first control variable to the temperature value is further performed.
In one possible implementation, the set of heat source devices includes a plurality of components;
before the first control variable is set to the first threshold, the method further includes:
receiving real-time temperature values of monitoring points of a plurality of components monitored by a temperature sensor;
and taking the maximum value of the real-time temperature values of the monitoring points of the components as the real-time limit temperature.
In one possible implementation manner, before the setting the first control variable to the first threshold value, the method further includes:
acquiring limit values of safe working temperatures of the components according to the properties of the components;
the minimum value of the limit values of the safe operating temperatures of the plurality of components is taken as the safe temperature.
In one possible implementation manner, before the first temperature rising speed of the component monitoring point is obtained, the method further includes:
receiving the rotating speed of the range extender monitored by the rotating speed sensor;
predicting the temperature rising speed of monitoring points of a plurality of components according to the rotating speed of the range extender;
and taking the maximum value of the heating speeds of the monitoring points of the components as the first heating speed.
In one possible implementation, the method further includes:
if the first heating speed is judged to be smaller than the heating threshold value, setting the time variable as an initial value;
maintaining the air supply amount of the fan;
judging whether the time variable is the product of the acquired heating time and a set coefficient;
if the time variable is judged to be the product of the acquired heating time and the set coefficient, continuing to execute the step of setting the first control variable as a temperature difference variable value;
and if the time variable is not the product of the acquired heating time and the set coefficient, continuing to execute the step of judging whether the time variable is the product of the acquired heating time and the set coefficient.
In one possible implementation, the temperature rise time is a time taken for a real-time limit temperature of the heat source component group to rise from the current limit temperature to the safe temperature at the first temperature rise rate.
In a second aspect, an embodiment of the present invention provides a control system for a fan, including: a variable frequency and variable voltage controller and a fan;
the variable frequency and variable pressure controller is used for setting a first control variable as a temperature difference value, wherein the temperature difference value is a difference value between the real-time limit temperature of the heat source component group and the safety temperature of the heat source component group;
the variable frequency and variable voltage controller is used for judging whether the first control variable is smaller than or equal to zero; if the first control variable is judged to be smaller than or equal to zero, a first heating speed of the heat source component group is obtained;
the variable frequency and variable voltage controller is used for judging whether the first heating speed is greater than or equal to a heating threshold value; and if the first temperature rising speed is larger than or equal to the temperature rising threshold value, adjusting the air supply quantity of the fan.
In one possible implementation manner, the variable frequency and variable voltage controller is further configured to set the time variable to an initial value if it is determined that the first heating rate is less than the heating threshold; maintaining the air supply amount of the fan; judging whether the time variable is the product of the acquired heating time and a set coefficient; if the time variable is the product of the acquired heating time and the set coefficient, continuing to execute the step of setting the first control variable as a temperature difference variable value; and if the time variable is not the product of the acquired heating time and the set coefficient, continuing to execute the step of judging whether the time variable is the product of the acquired heating time and the set coefficient.
In the technical scheme provided by the embodiment of the invention, the first control variable is set as a temperature difference value, wherein the temperature difference value is the difference value between the real-time limiting temperature of the heat source component group and the safety temperature of the heat source component group; judging whether the first control variable is smaller than or equal to zero; if the first control variable is less than or equal to zero, acquiring a first heating speed of the heat source component group; judging whether the first heating rate is greater than or equal to a heating threshold; and if the first temperature rising speed is larger than or equal to the temperature rising threshold value, adjusting the air supply quantity of the fan. According to the embodiment of the invention, the air supply quantity of the fan is controlled in a variable frequency and variable pressure mode, so that the energy consumption can be reduced, and the comfort level of the whole vehicle can be improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a control system of a fan according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for controlling a fan according to an embodiment of the present invention.
[ detailed description ] of the invention
For a better understanding of the technical solution of the present invention, the following detailed description of the embodiments of the present invention refers to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one way of describing an association of associated objects, meaning that there may be three relationships, e.g., a and/or b, which may represent: the first and second cases exist separately, and the first and second cases exist separately. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
Fig. 1 is a schematic structural diagram of a control system of a fan according to an embodiment of the present invention, as shown in fig. 1, the system includes: a variable frequency and variable pressure controller 1 and a fan 2. The variable frequency and variable voltage controller 1 is connected with a fan 2. The variable frequency and variable pressure controller 1 is used for setting a first control variable as a temperature difference value, wherein the temperature difference value is a difference value between the real-time limit temperature of the heat source component group and the safety temperature of the heat source component group; the variable frequency and variable voltage controller 1 is also used for judging whether the first control variable is smaller than or equal to zero; if the first control variable is less than or equal to zero, acquiring a first heating speed of the heat source component group; the variable frequency and variable voltage controller 1 is also used for judging whether the first temperature rising speed is greater than or equal to a temperature rising threshold value; if the first temperature rise speed is determined to be greater than or equal to the temperature rise threshold, the air supply amount of the fan 2 is adjusted.
In the embodiment of the invention, the heat source device group comprises a plurality of components, wherein the plurality of components comprise a range extender, an electric drive loop and the like.
In the embodiment of the invention, the frequency and the voltage of the driving power supply of the fan 2 are regulated by the variable frequency and variable voltage controller 1, so that the air supply quantity of the fan 2 is regulated.
In the embodiment of the present invention, the variable frequency and variable voltage controller 1 is further configured to adjust the air supply amount of the fan 2 if the first control variable is determined to be greater than zero.
As shown in fig. 1, further, the system further includes: a temperature sensor 3. The temperature sensor 3 is connected with the variable frequency and variable voltage controller 1. The temperature sensor 3 is used to monitor real-time temperature values of monitoring points of the plurality of components. The variable frequency and variable voltage controller 1 is further configured to receive, as the safe temperature, the minimum value among the limit values of the safe operating temperatures of the plurality of components monitored by the temperature sensor 3, and take, as the real-time limit temperature, the maximum value among the real-time temperature values of the monitoring points of the plurality of components.
In the embodiment of the present invention, the variable frequency and variable voltage controller 1 is further configured to obtain a limit value of the safe operating temperatures of the plurality of components according to the attributes of the plurality of components, and take a minimum value of the limit values of the safe operating temperatures of the plurality of components as the safe temperature.
As shown in fig. 1, further, the system further includes: a rotation speed sensor 4 and a range extender 5. The rotating speed sensor 4 is connected with the variable frequency and variable voltage controller 1, and the rotating speed sensor 4 is connected with the range extender 5. The rotation speed sensor 4 is used for monitoring the rotation speed of the range extender 5; the variable frequency and variable pressure controller 1 is also used for receiving the rotating speed of the range extender 5 detected by the rotating speed sensor 4; the variable frequency and variable pressure controller 1 is also used for predicting the temperature rising speed of the monitoring points of the plurality of components according to the rotating speed of the range extender 5; the variable frequency and variable pressure controller 1 is also configured to set the maximum value of the temperature rise rates of the monitoring points of the plurality of components as the first temperature rise rate.
In the embodiment of the invention, specifically, the variable frequency and variable voltage controller 1 predicts the temperature rising speed of the monitoring points of the plurality of components according to the rotating speed of the range extender 5 and by utilizing a rotating speed prediction temperature rising model.
In the embodiment of the invention, the frequency and voltage of the fan driving power supply are regulated to control the air supply quantity through the rotating speed prediction temperature rise model and the predicted temperature rise speed, so that the control is more accurate, and the feedforward control is realized.
In the embodiment of the present invention, the variable frequency and variable voltage controller 1 is further configured to set a time variable as an initial value to maintain the air supply amount of the fan 2 if it is determined that the first heating rate is less than the heating threshold; the variable frequency and variable voltage controller 1 is also used for judging whether the time variable is the product of the acquired heating time and the set coefficient; if the time variable is the product of the acquired heating time and the set coefficient, continuing to execute the step of setting the first control variable as the temperature difference variable value by the variable frequency and variable voltage controller 1; if it is determined that the time variable is not the product of the acquired temperature rise time and the set coefficient, the step of determining whether the time variable is the product of the acquired temperature rise time and the set coefficient by the variable frequency and variable voltage controller 1 is continued.
In the embodiment of the invention, the coefficient is set according to the vehicle type.
In the technical scheme provided by the embodiment of the invention, the first control variable is set as a temperature difference value, wherein the temperature difference value is the difference value between the real-time limiting temperature of the heat source component group and the safety temperature of the heat source component group; judging whether the first control variable is smaller than or equal to zero; if the first control variable is less than or equal to zero, acquiring a first heating speed of the heat source component group; judging whether the first heating rate is greater than or equal to a heating threshold; and if the first temperature rising speed is larger than or equal to the temperature rising threshold value, adjusting the air supply quantity of the fan. According to the embodiment of the invention, the air supply quantity of the fan is controlled in a variable frequency and variable pressure mode, so that the energy consumption can be reduced, and the comfort level of the whole vehicle can be improved.
The embodiment of the invention provides a control method of a fan, which can be realized based on a control system of the fan shown in fig. 1. Fig. 2 is a flowchart of a method for controlling a fan according to an embodiment of the present invention, as shown in fig. 2, the method includes:
and 101, the variable frequency and variable voltage controller acquires limit values of safe operating temperatures of the components according to the attributes of the components, and takes the minimum value in the limit values of the safe operating temperatures of the components as the safe temperature.
In the embodiment of the invention, the plurality of components comprise a range extender, an electric drive loop and the like.
And 102, receiving real-time temperature values of monitoring points of the plurality of components monitored by the temperature sensor by the variable frequency and variable voltage controller, and taking the maximum value of the real-time temperature values of the monitoring points of the plurality of components as a real-time limit temperature.
In the embodiment of the invention, the temperature sensor monitors real-time temperature values of the monitoring points of the plurality of components, and the variable frequency and variable voltage controller receives the real-time temperature values of the monitoring points of the plurality of components monitored by the temperature sensor and takes the maximum value of the real-time temperature values of the monitoring points of the plurality of components as the real-time limit temperature.
In the embodiment of the invention, the air quantity of the fan is controlled in real time by the relation between the real-time temperature value of the monitoring point and the safe working temperatures of the components, so that the occurrence of temperature overshoot is avoided, the temperature control is more accurate, and the energy is saved and the efficiency is improved.
In an embodiment of the invention, the heat source device group includes a plurality of components.
In this step, if the variable frequency and variable voltage controller determines that the first control variable is less than or equal to zero, the variable frequency and variable voltage controller: if the real-time limit temperature of the heat source component set is not higher than the safe temperature of the heat source component set, indicating that the heat source component set is in a safe state, executing step 106; if the variable frequency and variable voltage controller judges that the first control variable is greater than zero, namely: if the real-time limit temperature of the heat source component set is higher than the safe temperature of the heat source component set, which indicates that the heat source component set is in a dangerous state and that there is a possibility of damage to components in the heat source component set, step 105 is continued.
In the embodiment of the invention, the variable frequency and variable voltage controller changes the rotating speed of the fan by changing the frequency and the voltage of the fan driving power supply, and further changes the air quantity of the fan by changing the rotating speed of the fan.
And 106, receiving the rotating speed of the range extender monitored by the rotating speed sensor by the variable frequency and variable voltage controller.
And 107, predicting the heating rates of the monitoring points of the plurality of components by the variable frequency and variable voltage controller according to the rotating speed of the range extender, and taking the maximum value of the heating rates of the monitoring points of the plurality of components as a first heating rate.
In the embodiment of the invention, specifically, the variable frequency and variable voltage controller 1 predicts the temperature rising speed of the monitoring points of the plurality of components according to the rotating speed of the range extender 5 and by utilizing a rotating speed prediction temperature rising model.
In the step, if the variable frequency and variable voltage controller determines that the first heating rate is less than the heating threshold, the heating rate of the heat source component group is normal, and the heat source component group is in a safe state, continuing to step 110; if the variable frequency and variable voltage controller determines that the first heating rate is greater than or equal to the heating threshold, which indicates that the heating rate of the heat source component set is too high and the heat source component set is in a dangerous state, step 105 is executed.
In this step, the variable frequency and voltage controller keeps the rotation speed of the fan unchanged by keeping the frequency and voltage of the fan driving power supply unchanged, and further keeps the air supply of the fan unchanged by keeping the rotation speed of the fan unchanged.
In the step, if the variable frequency and variable voltage controller determines that the time variable is the product of the acquired heating time and the set coefficient, the step 103 is continuously executed; if the variable frequency and variable voltage controller determines that the time variable is not the product of the acquired temperature rise time and the set coefficient, the step 111 is continued. Wherein the setting coefficient is set according to the vehicle type.
In the embodiment of the invention, the heating time is the time for the real-time limit temperature of the heat source component group to rise from the current limit temperature to the safe temperature at the first heating speed.
In the technical scheme provided by the embodiment of the invention, the first control variable is set as a temperature difference value, wherein the temperature difference value is the difference value between the real-time limiting temperature of the heat source component group and the safety temperature of the heat source component group; judging whether the first control variable is smaller than or equal to zero; if the first control variable is less than or equal to zero, acquiring a first heating speed of the heat source component group; judging whether the first heating rate is greater than or equal to a heating threshold; and if the first temperature rising speed is larger than or equal to the temperature rising threshold value, adjusting the air supply quantity of the fan. According to the embodiment of the invention, the air supply quantity of the fan is controlled in a variable frequency and variable pressure mode, so that the energy consumption can be reduced, and the comfort level of the whole vehicle can be improved.
In the embodiment of the invention, the air supply quantity of the fan is controlled in a variable frequency and variable pressure mode, so that the temperature is accurately controlled, the condition of temperature overshoot is avoided, and the energy is saved and the efficiency is improved.
According to the embodiment of the invention, the frequency-conversion and voltage-transformation adjusting mode can realize frequency avoidance under the function of guaranteeing the heat dissipation function, and the comfort of the whole vehicle is effectively improved.
In the embodiment of the invention, the frequency conversion and transformation regulation mode is used for controlling the air quantity of the fan through the integral frequency conversion and transformation and the short-time frequency conversion and constant pressure, so that the energy is saved and the efficiency is improved.
In the embodiment of the invention, compared with a three-gear control and duty ratio control adjustment mode, the frequency conversion and transformation adjustment mode is easier to realize frequency avoidance, and the comfort of the whole vehicle can be effectively improved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (9)
1. A method of controlling a fan, the method comprising:
setting a first control variable as a temperature difference value, wherein the temperature difference value is a difference value between a real-time limit temperature of the heat source component group and a safe temperature of the heat source component group;
judging whether the first control variable is smaller than or equal to zero;
if the first control variable is judged to be smaller than or equal to zero, a first heating speed of a monitoring point of the heat source component group is obtained;
judging whether the first temperature rising speed is greater than or equal to a temperature rising threshold value;
if the first heating speed is judged to be greater than or equal to the heating threshold, the air supply quantity of the fan is regulated;
before the first temperature rising speed of the monitoring point of the heat source component group is obtained, the method further comprises the following steps:
receiving the rotating speed of the range extender monitored by the rotating speed sensor;
predicting the temperature rising speed of monitoring points of a plurality of components according to the rotating speed of the range extender;
and taking the maximum value of the heating speeds of the monitoring points of the components as the first heating speed.
2. The method as recited in claim 1, further comprising:
and if the first control variable is judged to be larger than zero, adjusting the air supply quantity of the fan.
3. The method according to claim 1 or 2, wherein the step of setting the first control variable to the temperature difference value is continued after the air supply amount of the fan is adjusted.
4. The method of claim 1, wherein the set of heat source components comprises a plurality of components;
before the first control variable is set to the temperature difference value, the method further comprises:
receiving real-time temperature values of monitoring points of a plurality of components monitored by a temperature sensor;
and taking the maximum value of the real-time temperature values of the monitoring points of the components as the real-time limit temperature.
5. The method of claim 1, wherein prior to setting the first control variable to the temperature differential value, further comprising:
acquiring limit values of safe working temperatures of the components according to the properties of the components;
the minimum value of the limit values of the safe operating temperatures of the plurality of components is taken as the safe temperature.
6. The method as recited in claim 1, further comprising:
if the first heating speed is judged to be smaller than the heating threshold value, setting a time variable as an initial value;
maintaining the air supply amount of the fan;
judging whether the time variable is the product of the acquired heating time and a set coefficient;
if the time variable is judged to be the product of the acquired heating time and the set coefficient, continuing to execute the step of setting the first control variable as a temperature difference variable value;
and if the time variable is not the product of the acquired heating time and the set coefficient, continuing to execute the step of judging whether the time variable is the product of the acquired heating time and the set coefficient.
7. The method of claim 6, wherein the ramp-up time is a time taken for a real-time limit temperature of the set of heat source components to ramp up from a current limit temperature to the safe temperature at the first ramp-up rate.
8. A control system for a fan, comprising: the variable frequency and variable pressure controller, the fan, the rotating speed sensor and the range extender;
the variable frequency and variable pressure controller is used for setting a first control variable as a temperature difference value, wherein the temperature difference value is a difference value between the real-time limit temperature of the heat source component group and the safety temperature of the heat source component group;
the variable frequency and variable voltage controller is used for judging whether the first control variable is smaller than or equal to zero; if the first control variable is judged to be smaller than or equal to zero, a first heating speed of a monitoring point of the heat source component group is obtained;
the variable frequency and variable voltage controller is used for judging whether the first heating speed is greater than or equal to a heating threshold value; if the first heating speed is judged to be greater than or equal to the heating threshold, the air supply quantity of the fan is regulated;
the rotating speed sensor is used for monitoring the rotating speed of the range extender;
the variable frequency and variable voltage controller is also used for receiving the rotating speed of the range extender monitored by the rotating speed sensor;
the variable frequency and variable voltage controller is also used for predicting the temperature rising speed of the monitoring points of the plurality of components according to the rotating speed of the range extender;
the variable frequency and variable voltage controller is also used for taking the maximum value of the heating speeds of the monitoring points of the components as the first heating speed.
9. The system of claim 8, wherein the system further comprises a controller configured to control the controller,
the variable frequency and variable voltage controller is further configured to set a time variable as an initial value if it is determined that the first heating rate is less than the heating threshold; maintaining the air supply amount of the fan; judging whether the time variable is the product of the acquired heating time and a set coefficient; if the time variable is the product of the acquired heating time and the set coefficient, continuing to execute the step of setting the first control variable as a temperature difference variable value; and if the time variable is not the product of the acquired heating time and the set coefficient, continuing to execute the step of judging whether the time variable is the product of the acquired heating time and the set coefficient.
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| CN101660539B (en) * | 2009-09-21 | 2011-08-10 | 中兴通讯股份有限公司 | Method and device for controlling rotating speed of fan |
| CN101806641B (en) * | 2010-03-18 | 2013-01-16 | 中兴通讯股份有限公司 | Device and method for realizing overheating prompt of mobile terminal |
| CN103850963B (en) * | 2012-11-28 | 2016-06-29 | 鸿富锦精密工业（深圳）有限公司 | Fan control system and control method for fan |
| US10486499B2 (en) * | 2013-07-18 | 2019-11-26 | Hangzhou Sanhua Research Institute Co., Ltd. | Method for controlling vehicle air-conditioning system, and vehicle air-conditioning system |
| CN108859860B (en) * | 2017-05-09 | 2021-03-02 | 郑州宇通客车股份有限公司 | Over-temperature prevention control method and system |
| CN108119213B (en) * | 2017-12-20 | 2020-03-10 | 潍柴动力股份有限公司 | DOC temperature control method and system |
| CN110617235B (en) * | 2019-08-22 | 2021-06-08 | 三维通信股份有限公司 | Method and device for controlling fan flow, computer equipment and readable storage medium |
| CN111882835A (en) * | 2020-07-29 | 2020-11-03 | 合肥阳光智维科技有限公司 | Fault early warning method and device of inverter and computer readable storage medium |
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