CN113126403A - Heat dissipation control method and system for projector - Google Patents
Heat dissipation control method and system for projector Download PDFInfo
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- CN113126403A CN113126403A CN202110440205.1A CN202110440205A CN113126403A CN 113126403 A CN113126403 A CN 113126403A CN 202110440205 A CN202110440205 A CN 202110440205A CN 113126403 A CN113126403 A CN 113126403A
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- 230000017525 heat dissipation Effects 0.000 title claims abstract description 121
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000001816 cooling Methods 0.000 claims abstract description 71
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/16—Cooling; Preventing overheating
Abstract
The invention discloses a heat dissipation control method and a heat dissipation control system of a projector, which comprise the following steps: acquiring a first temperature value of the heat source in the projector, and correcting the first temperature value to obtain a second temperature value; acquiring environmental parameters of the surrounding environment of the projector; the environment parameters comprise an environment temperature value, an environment humidity value and an environment air pressure value; obtaining target power according to the second temperature value and the environmental parameter; and adjusting the power of a cooling fan arranged in the projector according to the target power. Has the advantages that: the power of the cooling fan is adjusted through the temperature of the heat source inside the projector and the parameters of the surrounding environment of the projector, so that the timeliness of heat dissipation is guaranteed, and the service life of the projector is prolonged.
Description
Technical Field
The invention relates to the technical field of heat dissipation, in particular to a heat dissipation control method and system of a projector.
Background
With the development of science and technology, the application of the projector in life and production is more and more extensive. A projector is a high-power device that converts electrical energy into optical energy, and generates a large amount of heat in the process of converting electrical energy into optical energy. In order to achieve a better dustproof effect, the projector is generally very compact in structure, so that the heat dissipation effect is very poor, and heat is easily accumulated inside the projector. Once the heat build-up is too high, the performance and lifetime of the internal optics and electronics of the projector can be severely affected. At present, the influence of ambient environment parameters is not considered for the internal heat dissipation of the projector, the ambient humidity is too high, the heat dissipation channel can be frosted, the ambient air pressure is too high, the rotating speed of the heat dissipation fan can be reduced, and the untimely heat dissipation can be caused.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above. Therefore, a first objective of the present invention is to provide a method for controlling heat dissipation of a projector, in which power of a heat dissipation fan is adjusted according to a temperature of a heat source inside the projector and parameters of an environment around the projector, so as to ensure timeliness of heat dissipation and increase a service life of the projector.
The second objective of the present invention is to provide a heat dissipation control system for a projector.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for controlling heat dissipation of a projector, including:
acquiring a first temperature value of the heat source in the projector, and correcting the first temperature value to obtain a second temperature value;
acquiring environmental parameters of the surrounding environment of the projector; the environment parameters comprise an environment temperature value, an environment humidity value and an environment air pressure value;
obtaining target power according to the second temperature value and the environmental parameter;
and adjusting the power of a cooling fan arranged in the projector according to the target power.
Further, the heat dissipation control method for the projector further includes:
acquiring the working state of the cooling fan;
when the cooling fan is determined to be in a working state, acquiring a falling state of the projector; the falling state is obtained by an acceleration sensor which is arranged on the projector in advance;
and when the cooling fan is determined to be in a falling state, controlling the cooling fan to stop working.
Further, the obtaining a first temperature value of the internal heat source of the projector includes:
acquiring a first infrared image of a heat source inside the projector, performing image graying processing on the first infrared image, acquiring a first gray value of each pixel point in the grayed first infrared image, acquiring gray distribution of the first infrared image according to the first gray value of each pixel point, and acquiring a histogram of the first infrared image according to the gray distribution; the first infrared image is obtained by an infrared imager;
inputting the first infrared image into a pre-trained fuzzy membership degree acquisition model, and outputting a corresponding fuzzy membership degree; the fuzzy membership degree obtaining model is a neural network model obtained by training a sample infrared image and a fuzzy membership degree corresponding to the sample infrared image;
carrying out weighting adjustment on the histogram according to the fuzzy membership degree, and carrying out equalization processing on the histogram after weighting adjustment to obtain a second infrared image;
acquiring a second gray value of each pixel point of the second infrared image, and generating a first gray matrix according to the second gray value of each pixel point; acquiring infrared emissivity of each point of a heat source inside the projector, establishing an infrared emissivity distribution matrix corresponding to each pixel point of the second infrared image according to the infrared emissivity of each point of the heat source, and correcting the first gray matrix through the infrared emissivity distribution matrix to obtain a second gray matrix;
and acquiring a photoelectric response coefficient of the infrared imager, multiplying the second gray matrix by the photoelectric response coefficient to obtain a two-dimensional temperature matrix of the surface of the internal heat source of the projector, and calculating an average value of temperature values in the two-dimensional temperature matrix to obtain a first temperature value of the internal heat source of the projector.
Further, the heat dissipation control method for the projector further includes:
when the projector receives a starting instruction, judging whether the heat dissipation time length of the projector after the projector is turned off last time is longer than a preset time length or not, and controlling the projector to start when the heat dissipation time length is determined to be longer than the preset time length;
otherwise, the cooling fan is controlled to carry out cooling treatment on the projector, and the projector is started up until the cooling duration is longer than the preset duration.
Further, correcting the first temperature value to obtain a second temperature value, including:
calculating a second temperature value T according to the formula (1)2：
Wherein, T1Is the first temperature value; t ismaxIs the maximum temperature value in the two-dimensional temperature matrix; t is3Is the temperature value of the air surrounding the heat source; t isminIs the minimum temperature value in the two-dimensional temperature matrix; k is a temperature value correction coefficient.
Further, the heat dissipation control method for the projector further includes:
acquiring working information of the cooling fan;
calculating the heat dissipation efficiency of the heat dissipation fan according to the working information, judging whether the heat dissipation efficiency is smaller than a preset heat dissipation efficiency or not, carrying out fault detection on the heat dissipation fan and a heat dissipation channel when the heat dissipation efficiency is determined to be smaller than the preset heat dissipation efficiency to obtain a fault type, inquiring a preset maintenance method database according to the fault type to obtain a corresponding maintenance method, and sending the maintenance method to a maintenance personnel terminal.
Further, the calculating the heat dissipation efficiency of the heat dissipation fan according to the working information includes:
calculating a heat dissipation coefficient K of the heat dissipation fan as shown in formula (2):
wherein γ is an exhaust amount of the cooling fan in unit time; p is the static pressure of the cooling fan; ρ is the density of the air around the cooling fan; w is the torque of the heat radiation fan; n is the rotating speed of the heat radiation fan; r is the radius of the heat radiation fan;
calculating the heat dissipation efficiency eta of the heat dissipation fan according to the heat dissipation coefficient K of the heat dissipation fan, as shown in formula (3):
q is the heat taken away by the cooling fan in unit time; e is the energy consumption of the cooling fan; t is4The temperature of the air around the heat dissipation fan; t is2The second temperature value; lambda [ alpha ]1The attenuation coefficient of the performance of the heat radiation fan affected by the external environment is set; lambda [ alpha ]2E is a natural constant, which is an attenuation coefficient of the performance of the cooling fan affected by the internal environment.
Further, obtaining an ambient humidity value of an environment surrounding the projector includes:
acquiring a first humidity signal of the environment around the projector;
performing signal inversion processing on the first humidity signal to obtain an inverted humidity signal, and performing signal segmentation processing on the inverted humidity signal to obtain a first sub-inverted humidity signal and a second sub-inverted humidity signal; the lengths of the first sub-inversion humidity signal and the second sub-inversion humidity signal are the same;
taking the first sub-inversion humidity signal as a first signal to be detected; carrying out extension processing on the first signal to be detected based on a zero padding technology to obtain a second signal to be detected, carrying out fast Fourier transform on the second signal to be detected to obtain frequency spectrum data of the second signal to be detected, carrying out feature extraction on the frequency spectrum data to obtain feature parameters of the frequency spectrum data, and calculating according to the feature parameters to obtain a noise signal;
carrying out differential processing on the reversal humidity signal and the noise signal to obtain a differential signal, carrying out signal reversal processing on the differential signal to obtain a second humidity signal, carrying out signal segmentation processing on the second humidity signal to obtain a plurality of sub second humidity signals, respectively calculating the intensities of the sub second humidity signals to obtain a plurality of intensities, calculating to obtain an intensity mean value according to the intensities, inputting the intensity mean value into a pre-trained humidity value acquisition model to be corrected, and outputting the humidity value to be corrected; the humidity value acquisition model is a neural network model obtained by training a humidity value to be corrected corresponding to the average value of the sample humidity signal and the average value of the sample signal;
acquiring a current time point of the position of the projector, and inquiring a preset first data table according to the current time point to obtain a corresponding compensation coefficient;
inputting the environmental temperature value and the compensation coefficient into a pre-trained humidity correction coefficient acquisition model, and outputting a corresponding humidity correction coefficient;
and correcting the humidity value to be corrected according to the humidity correction coefficient to obtain an environment humidity value.
Further, the obtaining the target power according to the second temperature value and the environmental parameter includes:
and inquiring a preset second data table according to the second temperature value and the environmental parameter to obtain the corresponding target power.
An embodiment of a second aspect of the present invention provides a heat dissipation control system for a projector, including:
the heat source temperature acquisition module is used for acquiring a first temperature value of an internal heat source of the projector, and correcting the first temperature value to obtain a second temperature value;
the environment parameter acquisition module is used for acquiring environment parameters of the surrounding environment of the projector; the environment parameters comprise an environment temperature value, an environment humidity value and an environment air pressure value;
the target power acquisition module is used for obtaining target power according to the second temperature value and the environmental parameter;
and the adjusting module is used for adjusting the power of a cooling fan arranged in the projector according to the target power.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a heat dissipation control method for a projector according to the present invention;
fig. 2 is a structural diagram of a heat dissipation control system of a projector according to the present invention.
Reference numerals:
the device comprises a heat source temperature acquisition module 1, an environmental parameter acquisition module 2, a target power acquisition module 3 and an adjustment module 4.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
A method and a system for controlling heat dissipation of a projector according to an embodiment of the present invention are described with reference to fig. 1 and fig. 2.
As shown in fig. 1, a method for controlling heat dissipation of a projector includes:
s1, acquiring a first temperature value of the heat source inside the projector, and correcting the first temperature value to obtain a second temperature value;
s2, acquiring environmental parameters of the environment around the projector; the environment parameters comprise an environment temperature value, an environment humidity value and an environment air pressure value;
s3, obtaining target power according to the second temperature value and the environmental parameter;
and S4, adjusting the power of a cooling fan arranged in the projector according to the target power.
The working principle of the scheme is as follows: acquiring a first temperature value of the heat source in the projector, and correcting the first temperature value to obtain a second temperature value; acquiring environmental parameters of the surrounding environment of the projector; the environment parameters comprise an environment temperature value, an environment humidity value and an environment air pressure value; obtaining target power according to the second temperature value and the environmental parameter; and adjusting the power of a cooling fan arranged in the projector according to the target power.
The beneficial effect of above-mentioned scheme: the high humidity around the projector can make the heat dissipation channel frosted, and the high atmospheric pressure around can make radiator fan rotational speed reduce, all can cause radiating untimely. The power of the cooling fan is adjusted through the temperature of the heat source inside the projector and the parameters of the surrounding environment of the projector, so that the timeliness of heat dissipation is guaranteed, and the service life of the projector is prolonged.
According to some embodiments of the present invention, the method for controlling heat dissipation of a projector further includes:
acquiring the working state of the cooling fan;
when the cooling fan is determined to be in a working state, acquiring a falling state of the projector; the falling state is obtained by an acceleration sensor which is arranged on the projector in advance;
and when the cooling fan is determined to be in a falling state, controlling the cooling fan to stop working.
The working principle and the beneficial effects of the scheme are as follows: the projector can descend in the heat dissipation process, if the cooling fan descends in the working process of the projector, the internal hardware of the projector can be damaged, and therefore the cooling fan stops working in time when the projector is in a falling state, property loss of a user is reduced, and the service life of the projector is prolonged.
According to some embodiments of the invention, the obtaining a first temperature value of the internal heat source of the projector comprises:
acquiring a first infrared image of a heat source inside the projector, performing image graying processing on the first infrared image, acquiring a first gray value of each pixel point in the grayed first infrared image, acquiring gray distribution of the first infrared image according to the first gray value of each pixel point, and acquiring a histogram of the first infrared image according to the gray distribution; the first infrared image is obtained by an infrared imager;
inputting the first infrared image into a pre-trained fuzzy membership degree acquisition model, and outputting a corresponding fuzzy membership degree; the fuzzy membership degree obtaining model is a neural network model obtained by training a sample infrared image and a fuzzy membership degree corresponding to the sample infrared image;
carrying out weighting adjustment on the histogram according to the fuzzy membership degree, and carrying out equalization processing on the histogram after weighting adjustment to obtain a second infrared image;
acquiring a second gray value of each pixel point of the second infrared image, and generating a first gray matrix according to the second gray value of each pixel point; acquiring infrared emissivity of each point of a heat source inside the projector, establishing an infrared emissivity distribution matrix corresponding to each pixel point of the second infrared image according to the infrared emissivity of each point of the heat source, and correcting the first gray matrix through the infrared emissivity distribution matrix to obtain a second gray matrix;
and acquiring a photoelectric response coefficient of the infrared imager, multiplying the second gray matrix by the photoelectric response coefficient to obtain a two-dimensional temperature matrix of the surface of the internal heat source of the projector, and calculating an average value of temperature values in the two-dimensional temperature matrix to obtain a first temperature value of the internal heat source of the projector.
The working principle of the scheme is as follows: the accurate acquisition of the temperature of the heat source is an important step for adjusting the power of the cooling fan, and the scheme provides a method for accurately acquiring the temperature of the heat source; acquiring a first infrared image of a heat source inside the projector, performing image graying processing on the first infrared image, acquiring a first gray value of each pixel point in the grayed first infrared image, acquiring gray distribution of the first infrared image according to the first gray value of each pixel point, and acquiring a histogram of the first infrared image according to the gray distribution; the first infrared image is obtained by an infrared imager; inputting the first infrared image into a pre-trained fuzzy membership degree acquisition model, and outputting a corresponding fuzzy membership degree; the fuzzy membership degree obtaining model is a neural network model obtained by training a sample infrared image and a fuzzy membership degree corresponding to the sample infrared image; carrying out weighting adjustment on the histogram according to the fuzzy membership degree, and carrying out equalization processing on the histogram after weighting adjustment to obtain a second infrared image; acquiring a second gray value of each pixel point of the second infrared image, and generating a first gray matrix according to the second gray value of each pixel point; acquiring infrared emissivity of each point of a heat source inside the projector, establishing an infrared emissivity distribution matrix corresponding to each pixel point of the second infrared image according to the infrared emissivity of each point of the heat source, and correcting the first gray matrix through the infrared emissivity distribution matrix to obtain a second gray matrix;
and acquiring a photoelectric response coefficient of the infrared imager, multiplying the second gray matrix by the photoelectric response coefficient to obtain a two-dimensional temperature matrix of the surface of the internal heat source of the projector, and calculating an average value of temperature values in the two-dimensional temperature matrix to obtain a first temperature value of the internal heat source of the projector.
The beneficial effect of above-mentioned scheme: acquiring a first infrared image of a heat source in the projector, which is a necessary premise for accurately detecting the temperature of the heat source; performing image graying processing on the first infrared image to avoid image banding distortion, acquiring a first gray value of each pixel point in the grayed first infrared image, acquiring gray distribution of the first infrared image according to the first gray value of each pixel point, and acquiring a histogram of the first infrared image according to the gray distribution; the first infrared image is obtained by an infrared imager; inputting the first infrared image into a pre-trained fuzzy membership degree acquisition model, and outputting a corresponding fuzzy membership degree; the fuzzy membership represents the fuzzy degree of the image; the fuzzy membership degree obtaining model is a neural network model obtained by training a sample infrared image and a fuzzy membership degree corresponding to the sample infrared image; carrying out weighting adjustment on the histogram according to the fuzzy membership degree, and carrying out equalization processing on the histogram after weighting adjustment to obtain a second infrared image; the second infrared image after equalization processing is clearer, and the accuracy of the final detection result is ensured; acquiring a second gray value of each pixel point of the second infrared image, and generating a first gray matrix according to the second gray value of each pixel point; acquiring infrared emissivity of each point of a heat source inside the projector, establishing an infrared emissivity distribution matrix corresponding to each pixel point of the second infrared image according to the infrared emissivity of each point of the heat source, and correcting the first gray matrix through the infrared emissivity distribution matrix to obtain a second gray matrix; the infrared emissivity of each point of the heat source is obtained by an emissivity tester; the infrared imaging instrument has the advantages that the infrared emissivity of each point on the surface of the heat source is consistent, different emissivity exists for each point on the surface of the heat source with different color, roughness and the like, the infrared emissivity of each point of the heat source is obtained, the pixel points corresponding to the infrared emissivity are corrected, and the accuracy of the final detection result can be ensured; and acquiring a photoelectric response coefficient of the infrared imager, multiplying the second gray matrix by the photoelectric response coefficient to obtain a two-dimensional temperature matrix of the surface of the internal heat source of the projector, and calculating an average value of temperature values in the two-dimensional temperature matrix to obtain a first temperature value of the internal heat source of the projector, so that the finally obtained first temperature value is more accurate.
According to some embodiments of the present invention, the method for controlling heat dissipation of a projector further includes:
when the projector receives a starting instruction, judging whether the heat dissipation time length of the projector after the projector is turned off last time is longer than a preset time length or not, and controlling the projector to start when the heat dissipation time length is determined to be longer than the preset time length;
otherwise, the cooling fan is controlled to carry out cooling treatment on the projector, and the projector is started up until the cooling duration is longer than the preset duration.
The working principle of the scheme is as follows: when the projector receives a starting instruction, judging whether the heat dissipation time length of the projector after the projector is turned off last time is longer than a preset time length or not, and controlling the projector to start when the heat dissipation time length is determined to be longer than the preset time length; otherwise, the cooling fan is controlled to carry out cooling treatment on the projector, and the projector is started up until the cooling duration is longer than the preset duration.
The beneficial effect of above-mentioned scheme: in order to ensure that the projector radiates heat fully before starting, the projector continues to radiate heat for a period of time after being shut down, if the radiating time does not reach the preset radiating time, the heat in the projector is likely to accumulate excessively, and the performance and the service life of the projector are seriously affected.
According to some embodiments of the present invention, modifying the first temperature value to obtain a second temperature value includes:
calculating a second temperature value T according to the formula (1)2：
Wherein, T1Is the first temperature value; t ismaxIs the maximum temperature value in the two-dimensional temperature matrix; t is3Is the temperature value of the air surrounding the heat source; t isminIs the minimum temperature value in the two-dimensional temperature matrix; k is a temperature value correction coefficient.
The working principle and the beneficial effects of the scheme are as follows: and correcting the first temperature value so as to enable the second temperature value to be more accurate and have smaller error, and when calculating the second temperature, considering factors such as the maximum temperature value in the two-dimensional temperature matrix, the minimum temperature value in the two-dimensional temperature matrix, a temperature value correction coefficient and the like so as to enable the corrected second temperature value to be more accurate, thereby improving the accuracy of finally adjusting the power of the cooling fan, further ensuring the timeliness of cooling and reducing the waste of resources.
According to some embodiments of the present invention, the method for controlling heat dissipation of a projector further includes:
acquiring working information of the cooling fan;
calculating the heat dissipation efficiency of the heat dissipation fan according to the working information, judging whether the heat dissipation efficiency is smaller than a preset heat dissipation efficiency or not, carrying out fault detection on the heat dissipation fan and a heat dissipation channel when the heat dissipation efficiency is determined to be smaller than the preset heat dissipation efficiency to obtain a fault type, inquiring a preset maintenance method database according to the fault type to obtain a corresponding maintenance method, and sending the maintenance method to a maintenance personnel terminal.
The working principle of the scheme is as follows: acquiring working information of the cooling fan; calculating the heat dissipation efficiency of the heat dissipation fan according to the working information, judging whether the heat dissipation efficiency is smaller than a preset heat dissipation efficiency or not, carrying out fault detection on the heat dissipation fan and a heat dissipation channel when the heat dissipation efficiency is determined to be smaller than the preset heat dissipation efficiency to obtain a fault type, inquiring a preset maintenance method database according to the fault type to obtain a corresponding maintenance method, and sending the maintenance method to a maintenance personnel terminal.
The beneficial effect of above-mentioned scheme: the heat dissipation efficiency is an important parameter capable of representing the heat dissipation fan, if the heat dissipation efficiency of the heat dissipation fan is low, the untimely heat dissipation of the projector is caused, the service life of electronic equipment inside the projector is shortened, the situation that the heat dissipation efficiency is low can be that the heat dissipation fan breaks down, or a heat dissipation channel is blocked, therefore, when the heat dissipation efficiency is low, the heat dissipation fan and the heat dissipation channel are subjected to fault detection, a maintenance method is sent to a maintenance personnel terminal, the maintenance timeliness is guaranteed, the inspection time of the maintenance personnel is shortened, and the timeliness of the final heat dissipation is guaranteed.
According to some embodiments of the invention, the calculating the heat dissipation efficiency of the heat dissipation fan according to the working information comprises:
calculating a heat dissipation coefficient K of the heat dissipation fan as shown in formula (2):
wherein γ is an exhaust amount of the cooling fan in unit time; p is the static pressure of the cooling fan; ρ is the density of the air around the cooling fan; w is the torque of the heat radiation fan; n is the rotating speed of the heat radiation fan; r is the radius of the heat radiation fan;
calculating the heat dissipation efficiency eta of the heat dissipation fan according to the heat dissipation coefficient K of the heat dissipation fan, as shown in formula (3):
q is the heat taken away by the cooling fan in unit time; e is the energy consumption of the cooling fan; t is4The temperature of the air around the heat dissipation fan; t is2The second temperature value; lambda [ alpha ]1The attenuation coefficient of the performance of the heat radiation fan affected by the external environment is set; lambda [ alpha ]2E is a natural constant, which is an attenuation coefficient of the performance of the cooling fan affected by the internal environment.
The working principle and the beneficial effects of the scheme are as follows: the working information of the cooling fan is obtained, so that the cooling efficiency is calculated more quickly and accurately; when the heat dissipation efficiency is calculated, factors such as an attenuation coefficient of the performance of the heat dissipation fan influenced by an internal environment, an attenuation coefficient of the performance of the heat dissipation fan influenced by an external environment, heat taken away by the heat dissipation fan in unit time, energy consumption of the heat dissipation fan and the like are considered, so that the calculated heat dissipation efficiency is more accurate; wherein, the attenuation coefficient of the performance of the heat radiation fan influenced by the external environment comprises the surrounding dust, the temperature and the like; the attenuation coefficient of the performance of the heat radiation fan influenced by the internal environment comprises short circuit, open circuit and the like; the static pressure of a radiator fan is characterized by the ability of the air flow to overcome on-way resistance after the fan has done work on the air flow.
According to some embodiments of the invention, obtaining an ambient humidity value of an environment surrounding the projector comprises:
acquiring a first humidity signal of the environment around the projector;
performing signal inversion processing on the first humidity signal to obtain an inverted humidity signal, and performing signal segmentation processing on the inverted humidity signal to obtain a first sub-inverted humidity signal and a second sub-inverted humidity signal; the lengths of the first sub-inversion humidity signal and the second sub-inversion humidity signal are the same;
taking the first sub-inversion humidity signal as a first signal to be detected; carrying out extension processing on the first signal to be detected based on a zero padding technology to obtain a second signal to be detected, carrying out fast Fourier transform on the second signal to be detected to obtain frequency spectrum data of the second signal to be detected, carrying out feature extraction on the frequency spectrum data to obtain feature parameters of the frequency spectrum data, and calculating according to the feature parameters to obtain a noise signal;
carrying out differential processing on the reversal humidity signal and the noise signal to obtain a differential signal, carrying out signal reversal processing on the differential signal to obtain a second humidity signal, carrying out signal segmentation processing on the second humidity signal to obtain a plurality of sub second humidity signals, respectively calculating the intensities of the sub second humidity signals to obtain a plurality of intensities, calculating to obtain an intensity mean value according to the intensities, inputting the intensity mean value into a pre-trained humidity value acquisition model to be corrected, and outputting the humidity value to be corrected; the humidity value acquisition model is a neural network model obtained by training a humidity value to be corrected corresponding to the average value of the sample humidity signal and the average value of the sample signal;
acquiring a current time point of the position of the projector, and inquiring a preset first data table according to the current time point to obtain a corresponding compensation coefficient;
inputting the environmental temperature value and the compensation coefficient into a pre-trained humidity correction coefficient acquisition model, and outputting a corresponding humidity correction coefficient;
and correcting the humidity value to be corrected according to the humidity correction coefficient to obtain an environment humidity value.
The working principle of the scheme is as follows: the projector has the advantages that the humidity of the surrounding environment of the projector is too high, the power of the cooling fan is too high, the frosting of a cooling channel can be caused, and the untimely cooling is further caused, so that the humidity of the surrounding environment of the projector is accurately obtained, the power of the cooling fan is further adjusted, and the power of the cooling fan is in a relatively balanced state; acquiring a first humidity signal of the environment around the projector; the humidity signal is a millimeter wave signal transmitted by a millimeter wave signal transmitter; performing signal inversion processing on the first humidity signal to obtain an inverted humidity signal, and performing signal segmentation processing on the inverted humidity signal to obtain a first sub-inverted humidity signal and a second sub-inverted humidity signal; the lengths of the first sub-inversion humidity signal and the second sub-inversion humidity signal are the same; the first sub-inversion humidity signal is the second half of the first humidity signal, and the second half is completely submerged by noise, so that the first sub-inversion humidity signal is selected as an estimation noise signal in the first humidity signal; taking the first sub-inversion humidity signal as a first signal to be detected; carrying out extension processing on the first signal to be detected based on a zero padding technology to obtain a second signal to be detected, carrying out fast Fourier transform on the second signal to be detected to obtain frequency spectrum data of the second signal to be detected, carrying out feature extraction on the frequency spectrum data to obtain feature parameters of the frequency spectrum data, and calculating according to the feature parameters to obtain a noise signal; the characteristic parameters comprise amplitude, phase and frequency; carrying out differential processing on the reversal humidity signal and the noise signal to obtain a differential signal, carrying out signal reversal processing on the differential signal to obtain a second humidity signal, carrying out signal segmentation processing on the second humidity signal to obtain a plurality of sub second humidity signals, respectively calculating the intensities of the sub second humidity signals to obtain a plurality of intensities, calculating to obtain an intensity mean value according to the intensities, inputting the intensity mean value into a pre-trained humidity value acquisition model to be corrected, and outputting the humidity value to be corrected; the humidity value acquisition model is a neural network model obtained by training a humidity value to be corrected corresponding to the average value of the sample humidity signal and the average value of the sample signal; acquiring a current time point of the position of the projector, and inquiring a preset first data table according to the current time point to obtain a corresponding compensation coefficient; inputting the environmental temperature value and the compensation coefficient into a pre-trained humidity correction coefficient acquisition model, and outputting a corresponding humidity correction coefficient; and correcting the humidity value to be corrected according to the humidity correction coefficient to obtain an environment humidity value.
The beneficial effect of above-mentioned scheme: acquiring a first humidity signal of the environment around the projector is a necessary premise for detecting the humidity around the projector; the characteristic that the millimeter wave signal has high data transmission speed is utilized, so that the faster humidity sensing and detection are realized, and the sensitivity is higher; performing signal inversion processing on the first humidity signal to obtain an inverted humidity signal, and performing signal segmentation processing on the inverted humidity signal to obtain a first sub-inverted humidity signal and a second sub-inverted humidity signal; the lengths of the first sub-inversion humidity signal and the second sub-inversion humidity signal are the same; the first sub-inversion humidity signal is the second half of the first humidity signal, and the second half is completely submerged by noise, so that the first sub-inversion humidity signal is selected as an estimation noise signal in the first humidity signal; taking the first sub-inversion humidity signal as a first signal to be detected; carrying out extension processing on the first signal to be detected based on a zero padding technology to obtain a second signal to be detected, carrying out fast Fourier transform on the second signal to be detected to obtain frequency spectrum data of the second signal to be detected, carrying out feature extraction on the frequency spectrum data to obtain feature parameters of the frequency spectrum data, and calculating according to the feature parameters to obtain a noise signal; the characteristic parameters comprise amplitude, phase and frequency; noise signals obtained through amplitude, phase and frequency calculation are more accurate, the inversion humidity signals and the noise signals are subjected to differential processing to obtain differential signals, the differential signals are subjected to signal inversion processing to obtain second humidity signals, noise in the first humidity signals is removed, the second humidity signals are clearer and cleaner, and accuracy of final detection results is improved; performing signal segmentation processing on the second humidity signal to obtain a plurality of sub-second humidity signals, respectively calculating the intensities of the sub-second humidity signals to obtain a plurality of intensities, calculating to obtain an intensity mean value according to the intensities, inputting the intensity mean value into a pre-trained humidity value acquisition model to be corrected, and outputting the humidity value to be corrected; the humidity value acquisition model is a neural network model obtained by training a humidity value to be corrected corresponding to the average value of the sample humidity signal and the average value of the sample signal; acquiring a current time point of the position of the projector, and inquiring a preset first data table according to the current time point to obtain a corresponding compensation coefficient; the illumination of each time point is different, so that the compensation coefficient corresponding to each time point is different, and a first data table is preset as a current time point-compensation coefficient table; inputting the environmental temperature value and the compensation coefficient into a pre-trained humidity correction coefficient acquisition model, and outputting a corresponding humidity correction coefficient; and correcting the humidity value to be corrected according to the humidity correction coefficient to obtain an environment humidity value, wherein the temperature of the surrounding environment is also an important factor influencing the accurate humidity measurement, and the humidity correction coefficient obtained through the environment temperature value and the compensation coefficient is more accurate, so that the finally obtained environment humidity value is ensured to be accurate, the power of the cooling fan is in a relatively balanced state, and the service life of the projector is prolonged.
According to some embodiments of the invention, the obtaining the target power according to the second temperature value and the environmental parameter comprises:
and inquiring a preset second data table according to the second temperature value and the environmental parameter to obtain the corresponding target power.
The working principle and the beneficial effects of the scheme are as follows: and inquiring a preset second data table according to the second temperature value and the environmental parameter to obtain corresponding target power, wherein the preset second data table is a second temperature value-environmental parameter-target power table.
As shown in fig. 2, a heat dissipation control system of a projector includes:
the heat source temperature acquisition module is used for acquiring a first temperature value of an internal heat source of the projector, and correcting the first temperature value to obtain a second temperature value;
the environment parameter acquisition module is used for acquiring environment parameters of the surrounding environment of the projector; the environment parameters comprise an environment temperature value, an environment humidity value and an environment air pressure value;
the target power acquisition module is used for obtaining target power according to the second temperature value and the environmental parameter;
and the adjusting module is used for adjusting the power of a cooling fan arranged in the projector according to the target power.
The working principle of the scheme is as follows: the heat source temperature acquisition module is used for acquiring a first temperature value of an internal heat source of the projector, and correcting the first temperature value to obtain a second temperature value; the environment parameter acquisition module is used for acquiring environment parameters of the surrounding environment of the projector; the environment parameters comprise an environment temperature value, an environment humidity value and an environment air pressure value; the target power acquisition module is used for obtaining target power according to the second temperature value and the environmental parameter; the adjusting module is used for adjusting the power of a cooling fan arranged in the projector according to the target power.
The beneficial effect of above-mentioned scheme: the high humidity around the projector can make the heat dissipation channel frosted, and the high atmospheric pressure around can make radiator fan rotational speed reduce, all can cause radiating untimely. The power of the cooling fan is adjusted through the temperature of the heat source inside the projector and the parameters of the surrounding environment of the projector, so that the timeliness of heat dissipation is guaranteed, and the service life of the projector is prolonged.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A heat dissipation control method of a projector is characterized by comprising the following steps:
acquiring a first temperature value of the heat source in the projector, and correcting the first temperature value to obtain a second temperature value;
acquiring environmental parameters of the surrounding environment of the projector; the environment parameters comprise an environment temperature value, an environment humidity value and an environment air pressure value;
obtaining target power according to the second temperature value and the environmental parameter;
and adjusting the power of a cooling fan arranged in the projector according to the target power.
2. The method of claim 1, further comprising:
acquiring the working state of the cooling fan;
when the cooling fan is determined to be in a working state, acquiring a falling state of the projector; the falling state is obtained by an acceleration sensor which is arranged on the projector in advance;
and when the cooling fan is determined to be in a falling state, controlling the cooling fan to stop working.
3. The method as claimed in claim 1, wherein the obtaining the first temperature value of the internal heat source of the projector comprises:
acquiring a first infrared image of a heat source inside the projector, performing image graying processing on the first infrared image, acquiring a first gray value of each pixel point in the grayed first infrared image, acquiring gray distribution of the first infrared image according to the first gray value of each pixel point, and acquiring a histogram of the first infrared image according to the gray distribution; the first infrared image is obtained by an infrared imager;
inputting the first infrared image into a pre-trained fuzzy membership degree acquisition model, and outputting a corresponding fuzzy membership degree; the fuzzy membership degree obtaining model is a neural network model obtained by training a sample infrared image and a fuzzy membership degree corresponding to the sample infrared image;
carrying out weighting adjustment on the histogram according to the fuzzy membership degree, and carrying out equalization processing on the histogram after weighting adjustment to obtain a second infrared image;
acquiring a second gray value of each pixel point of the second infrared image, and generating a first gray matrix according to the second gray value of each pixel point; acquiring infrared emissivity of each point of a heat source inside the projector, establishing an infrared emissivity distribution matrix corresponding to each pixel point of the second infrared image according to the infrared emissivity of each point of the heat source, and correcting the first gray matrix through the infrared emissivity distribution matrix to obtain a second gray matrix;
and acquiring a photoelectric response coefficient of the infrared imager, multiplying the second gray matrix by the photoelectric response coefficient to obtain a two-dimensional temperature matrix of the surface of the internal heat source of the projector, and calculating an average value of temperature values in the two-dimensional temperature matrix to obtain a first temperature value of the internal heat source of the projector.
4. The method of claim 1, further comprising:
when the projector receives a starting instruction, judging whether the heat dissipation time length of the projector after the projector is turned off last time is longer than a preset time length or not, and controlling the projector to start when the heat dissipation time length is determined to be longer than the preset time length;
otherwise, the cooling fan is controlled to carry out cooling treatment on the projector, and the projector is started up until the cooling duration is longer than the preset duration.
5. The method according to claim 3, wherein the correcting the first temperature value to obtain a second temperature value includes:
calculating a second temperature value T according to the formula (1)2：
Wherein, T1Is the first temperature value; t ismaxIs the maximum temperature value in the two-dimensional temperature matrix; t is3Is the temperature value of the air surrounding the heat source; t isminIs the minimum temperature value in the two-dimensional temperature matrix; k is a temperature value correction coefficient.
6. The method of claim 1, further comprising:
acquiring working information of the cooling fan;
calculating the heat dissipation efficiency of the heat dissipation fan according to the working information, judging whether the heat dissipation efficiency is smaller than a preset heat dissipation efficiency or not, carrying out fault detection on the heat dissipation fan and a heat dissipation channel when the heat dissipation efficiency is determined to be smaller than the preset heat dissipation efficiency to obtain a fault type, inquiring a preset maintenance method database according to the fault type to obtain a corresponding maintenance method, and sending the maintenance method to a maintenance personnel terminal.
7. The method as claimed in claim 6, wherein the calculating the heat dissipation efficiency of the heat dissipation fan according to the operation information includes:
calculating a heat dissipation coefficient K of the heat dissipation fan as shown in formula (2):
wherein γ is an exhaust amount of the cooling fan in unit time; p is the static pressure of the cooling fan; ρ is the density of the air around the cooling fan; w is the torque of the heat radiation fan; n is the rotating speed of the heat radiation fan; r is the radius of the heat radiation fan;
calculating the heat dissipation efficiency eta of the heat dissipation fan according to the heat dissipation coefficient K of the heat dissipation fan, as shown in formula (3):
q is the heat taken away by the cooling fan in unit time; e is the energy consumption of the cooling fan; t is4The temperature of the air around the heat dissipation fan; t is2The second temperature value; lambda [ alpha ]1The attenuation coefficient of the performance of the heat radiation fan affected by the external environment is set; lambda [ alpha ]2E is a natural constant, which is an attenuation coefficient of the performance of the cooling fan affected by the internal environment.
8. The method of claim 1, wherein obtaining the ambient humidity value of the environment surrounding the projector comprises:
acquiring a first humidity signal of the environment around the projector;
performing signal inversion processing on the first humidity signal to obtain an inverted humidity signal, and performing signal segmentation processing on the inverted humidity signal to obtain a first sub-inverted humidity signal and a second sub-inverted humidity signal; the lengths of the first sub-inversion humidity signal and the second sub-inversion humidity signal are the same;
taking the first sub-inversion humidity signal as a first signal to be detected; carrying out extension processing on the first signal to be detected based on a zero padding technology to obtain a second signal to be detected, carrying out fast Fourier transform on the second signal to be detected to obtain frequency spectrum data of the second signal to be detected, carrying out feature extraction on the frequency spectrum data to obtain feature parameters of the frequency spectrum data, and calculating according to the feature parameters to obtain a noise signal;
carrying out differential processing on the reversal humidity signal and the noise signal to obtain a differential signal, carrying out signal reversal processing on the differential signal to obtain a second humidity signal, carrying out signal segmentation processing on the second humidity signal to obtain a plurality of sub second humidity signals, respectively calculating the intensities of the sub second humidity signals to obtain a plurality of intensities, calculating to obtain an intensity mean value according to the intensities, inputting the intensity mean value into a pre-trained humidity value acquisition model to be corrected, and outputting the humidity value to be corrected; the humidity value acquisition model is a neural network model obtained by training a humidity value to be corrected corresponding to the average value of the sample humidity signal and the average value of the sample signal;
acquiring a current time point of the position of the projector, and inquiring a preset first data table according to the current time point to obtain a corresponding compensation coefficient;
inputting the environmental temperature value and the compensation coefficient into a pre-trained humidity correction coefficient acquisition model, and outputting a corresponding humidity correction coefficient;
and correcting the humidity value to be corrected according to the humidity correction coefficient to obtain an environment humidity value.
9. The method as claimed in claim 1, wherein obtaining the target power according to the second temperature value and the environmental parameter comprises:
and inquiring a preset second data table according to the second temperature value and the environmental parameter to obtain the corresponding target power.
10. A heat dissipation control system for a projector, comprising:
the heat source temperature acquisition module is used for acquiring a first temperature value of an internal heat source of the projector, and correcting the first temperature value to obtain a second temperature value;
the environment parameter acquisition module is used for acquiring environment parameters of the surrounding environment of the projector; the environment parameters comprise an environment temperature value, an environment humidity value and an environment air pressure value;
the target power acquisition module is used for obtaining target power according to the second temperature value and the environmental parameter;
and the adjusting module is used for adjusting the power of a cooling fan arranged in the projector according to the target power.
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