CN107631802A - The control method and device of passive type infrared detector - Google Patents
The control method and device of passive type infrared detector Download PDFInfo
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Abstract
Present invention is disclosed a kind of control method and device of passive type infrared detector, including：Judge the passive type infrared detector search coverage whether someone；It is if it is determined that someone, then close or leave the detection frequency that the state of the passive type infrared detector adjusts the passive type infrared detector according to the people；If it is determined that nobody, then perform default sleep detection frequency.The control method and device of the passive type infrared detector of the present invention, first judge passive type infrared detector search coverage whether someone, then judge that people is directed towards the motion of passive type infrared detector or moved away from passive type infrared detector, and then adjust the detection frequency of passive type infrared detector, when people is away from passive type infrared detector, detection frequency can be controlled to reduce, so as to reduce the energy expenditure of passive type infrared detector.
Description
Technical Field
The invention relates to the field of passive infrared detectors, in particular to a control method and a control device of a passive infrared detector.
Background
The passive infrared detector generates a corresponding signal by means of the change of infrared heat energy emitted by a body of an animal passively absorbing heat energy when the animal moves, and is also called a heat release infrared probe, and the detector does not emit infrared rays. With the development of electronic technology, various intelligent terminals, such as intelligent door locks, intelligent controllers and the like, are continuously reproduced, and the intelligent terminals have a common point, and a dry battery or a lithium battery is adopted for power supply, so that the energy consumption of the intelligent terminals needs to be reduced as much as possible. Therefore, the passive infrared detector is generally arranged on the intelligent terminal, and when the infrared detector detects that a person approaches, the intelligent terminal is started. The infrared detector is also started and closed for detection at fixed intervals, and the detection sensitivity is too low due to overlong interval time; too short an interval will cause too much power consumption for detection.
Disclosure of Invention
The invention mainly aims to provide a control method and a control device of a passive infrared detector, which can reduce the energy consumption of the passive infrared detector.
In order to achieve the above object, the present invention provides a method for controlling a passive infrared detector, including:
judging whether a person exists in a detection area of the passive infrared detector;
if the person is judged to be present, adjusting the detection frequency of the passive infrared detector according to the state that the person approaches or leaves the passive infrared detector;
and if no person is judged, executing a preset dormancy detection frequency.
Further, the step of determining whether a person is in the detection area of the passive infrared detector includes:
subtracting a second infrared radiation amount detected by a previous time detection node from a first infrared radiation amount detected by a current time detection node to obtain a radiation amount difference value;
and if the absolute value of the radiation quantity difference is larger than the radiation quantity threshold value, determining that the detection area of the passive infrared detector is occupied.
Further, the step of adjusting the detection frequency of the passive infrared detector according to the state of the person approaching or leaving the passive infrared detector includes:
if the radiation quantity difference value is a positive value and is greater than the radiation quantity threshold value, judging that the person moves close to the passive infrared detector, and controlling the detection frequency of the passive infrared detector to be increased;
and if the radiation quantity difference value is a negative value and the absolute value of the radiation quantity difference value is greater than the radiation quantity threshold value, judging that the person moves away from the passive infrared detector, and controlling the detection frequency of the passive infrared detector to be reduced.
Further, the step of controlling the detection frequency of the passive infrared detector to become larger includes:
controlling the time interval between adjacent time detection nodes of the passive infrared detector to be shortened according to a preset time length; or,
and controlling the time interval of adjacent time detection nodes of the passive infrared detector to be reduced according to the specified proportion of the radiant quantity difference.
Further, the step of controlling the detection frequency of the passive infrared detector to be reduced includes:
controlling the time interval between adjacent time detection nodes of the passive infrared detector to increase according to a preset time length; or,
and controlling the time interval of the adjacent time detection nodes of the passive infrared detector to increase according to the specified proportion of the radiant quantity difference.
The invention also provides a control device of the passive infrared detector, which comprises:
the judging unit is used for judging whether a person exists in a detection area of the passive infrared detector;
the first execution unit is used for adjusting the detection frequency of the passive infrared detector according to the state that the person approaches or leaves the passive infrared detector if the detection area of the passive infrared detector is judged to be occupied;
and the second execution unit is used for executing the preset dormancy detection frequency if the detection area of the passive infrared detector is judged to be unmanned.
Further, the judging unit includes:
the calculation module is used for subtracting a second infrared radiation amount detected by a previous time detection node from a first infrared radiation amount detected by a current time detection node to obtain a radiation amount difference value;
and the judging module is used for judging that the detection area of the passive infrared detector is occupied if the absolute value of the radiation quantity difference is greater than the radiation quantity threshold.
Further, the first execution unit includes:
the first execution module is used for judging that the person moves close to the passive infrared detector and controlling the detection frequency of the passive infrared detector to be increased if the radiation quantity difference value is a positive value and is greater than the radiation quantity threshold value;
and the second execution module is used for judging that the person moves away from the passive infrared detector and controlling the detection frequency of the passive infrared detector to be reduced if the radiation quantity difference value is a negative value and the absolute value of the radiation quantity difference value is greater than the radiation quantity threshold value.
Further, the first execution module includes:
the first execution submodule is used for controlling the time interval between adjacent time detection nodes of the passive infrared detector to be shortened according to a preset time length; or,
and the second execution submodule is used for controlling the time interval of adjacent time detection nodes of the passive infrared detector to be reduced according to the specified proportion of the radiant quantity difference value.
Further, the second execution module includes:
the third execution submodule is used for controlling the time interval between adjacent time detection nodes of the passive infrared detector to increase according to the preset time length; or,
a fourth execution submodule for controlling the time interval between adjacent time detection nodes of the passive infrared detector to increase according to the specified proportion of the radiant quantity difference
According to the control method and the control device of the passive infrared detector, whether a person exists in a detection area of the passive infrared detector is judged, whether the person moves towards the passive infrared detector or moves away from the passive infrared detector is judged, the detection frequency of the passive infrared detector is adjusted, and when the person is far away from the passive infrared detector, the detection frequency can be controlled to be reduced, so that the energy consumption of the passive infrared detector is reduced.
Drawings
Fig. 1 is a schematic flow chart illustrating a control method of a passive infrared detector according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating a process of determining whether a person is in a detection area of a passive infrared detector according to an embodiment of the present invention;
FIG. 3 is a block diagram schematically illustrating a control apparatus of a passive infrared detector according to an embodiment of the present invention;
FIG. 4 is a block diagram illustrating a structure of a determining unit according to an embodiment of the present invention;
fig. 5 is a block diagram illustrating a first execution unit according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, an embodiment of the present invention provides a method for controlling a passive infrared detector, including:
and S1, judging whether the detection area of the passive infrared detector is occupied or not.
In this step, the passive infrared detector is a device for passively receiving the amount of infrared radiation, and when an animal or a person moves in a detection area of the passive infrared detector, a corresponding signal is generated according to the change of the amount of absorbed infrared radiation, so as to determine whether the detection area of the passive infrared detector is an animal or a human. The detection area is an effective detection area of the passive infrared detector.
And S2, if the person is judged to be present, adjusting the detection frequency of the passive infrared detector according to the state that the person approaches or leaves the passive infrared detector.
In this step, the person in the detection area of the passive infrared detector generally has three states, the first state is a movement toward the passive infrared detector, the second state is a movement away from the passive infrared detector, and the third state is a standing position. In the third state, the passive infrared detector generally judges that no person exists because the amount of infrared radiation received by the passive infrared detector is unchanged or the variation amount is small; in the first and second states, the amount of infrared radiation received by the passive infrared detector changes significantly, so that the general direction of motion of the person in the detection area can be determined from the changed state. If the infrared detector moves away from the passive infrared detector, the detection frequency of the passive infrared detector can be reduced, so that the energy consumption is reduced; if the infrared detector moves towards the passive infrared detector, the detection frequency of the passive infrared detector can be increased, so that the detection sensitivity is improved.
And S3, if no person is judged, executing a preset dormancy detection frequency.
In this step, the sleep detection frequency is a detection frequency executed by the passive infrared detector after determining that the detection area is free of the person, and the sleep detection frequency is determined to meet the requirement of being found by the passive infrared detector before the person approaches the passive infrared detector.
Referring to fig. 2, in this embodiment, the step S1 of determining whether there is a person in the detection area of the passive infrared detector includes:
and S11, subtracting the second infrared radiation amount detected by the previous time detection node from the first infrared radiation amount detected by the current time detection node to obtain a radiation amount difference value.
In this step, the current time detection node is the time node of the latest data acquisition. The last time detection node is the time node for collecting data last to the time node for collecting data last. The radiation quantity difference value can be a positive value or a negative value, and the movement direction of a person in the detection area of the passive infrared detector can be judged according to the positive value and the negative value.
And S12, if the absolute value of the radiation quantity difference value is larger than the radiation quantity threshold value, determining that the detection area of the passive infrared detector is occupied.
In this step, the threshold value of the radiation amount is an empirical threshold value, and is generally set by a manufacturer before shipment. Any object can radiate infrared rays, but the radiation amount is different, in addition, the radiation amount of the infrared rays radiated by the object is also related to the temperature, the higher the temperature is, the larger the infrared radiation amount is, therefore, the infrared radiation amount of the object in the environment where the passive infrared detector is located will also change, for example, the passive infrared detector is disposed on the intelligent terminal of the security door, and the security door is operated in 24 hours of a day, the temperature of the environment where the passive infrared detector is located can also change, for example, the temperature at noon is higher, the temperature at night is lower, and the like, so that the infrared radiation quantity collected by the passive infrared detector can also change, but the environment temperature and the like can not change suddenly but change slowly, therefore, the obtained radiation quantity difference value is small, and the setting of the radiation quantity threshold value is to eliminate the radiation quantity difference value obtained under the condition and to misjudge whether a person exists in the detection area.
In this embodiment, the step S2 of adjusting the detection frequency of the passive infrared detector according to the state of the person approaching or leaving the passive infrared detector includes:
s21, if the radiation quantity difference value is a positive value and is larger than a radiation quantity threshold value, judging that the person moves close to the passive infrared detector, and controlling the detection frequency of the passive infrared detector to be increased;
and S22, if the radiation quantity difference value is a negative value and the absolute value of the radiation quantity difference value is larger than the radiation quantity threshold value, judging that the person moves away from the passive infrared detector, and controlling the detection frequency of the passive infrared detector to be reduced.
As described in the above steps S21 and S22, since the difference between the radiation amounts is a positive value, which indicates that the first infrared radiation amount detected by the current time detection node is greater than the second infrared radiation amount detected by the previous time detection node, which indicates that the infrared radiation amount collected by the passive infrared detector is relatively greater, it can be determined that the heat source (human) is moving closer to the passive infrared detector, and conversely, the difference between the radiation amounts is a negative value, which indicates that the heat source is moving away from the passive infrared detector. When the heat source moves close to the passive infrared detector, the passive infrared detector is required to sensitively judge the moving state of the heat source, so that the detection frequency of the passive infrared detector is improved, and conversely, when the heat source moves far away from the passive infrared detector, the passive infrared detector is not required to sensitively judge the moving state of the heat source, so that the detection frequency of the passive infrared detector can be reduced, and the energy consumption of the passive infrared detector is reduced.
In this embodiment, the step of controlling the detection frequency of the passive infrared detector to increase in step S21 includes:
s211, controlling the time interval of adjacent time detection nodes of the passive infrared detector to be shortened according to a preset time length; or controlling the time interval of the adjacent time detection nodes of the passive infrared detector to be reduced according to the specified proportion of the radiant quantity difference.
In this step, the preset time length is a fixed time length, such as one millisecond. The above-mentioned reduction in the prescribed ratio according to the difference in the amount of radiation means that the difference in the amount of radiation is divided by a numerical value to obtain a reduced time length, for example, a reduced time length obtained by dividing the difference in the amount of radiation by the first amount of infrared radiation, or a reduced time length obtained by dividing the difference in the amount of radiation by the second amount of infrared radiation, or the like. In this embodiment, the detection frequency of the passive infrared detector will not increase infinitely, and a maximum upper limit value is set.
In this embodiment, the step of controlling the detection frequency of the passive infrared detector to decrease in step S22 includes:
s221, controlling the time interval of adjacent time detection nodes of the passive infrared detector to increase according to a preset time length; or controlling the time interval of the adjacent time detection nodes of the passive infrared detector to increase according to the specified proportion of the radiant quantity difference.
In this step, the preset time length is a fixed time length, such as one millisecond. The above-mentioned reduction in the prescribed ratio according to the difference in the amount of radiation means that the difference in the amount of radiation is divided by a numerical value to obtain the length of time of increase, for example, the length of time of increase obtained by dividing the difference in the amount of radiation by the first amount of infrared radiation, or the length of time of increase obtained by dividing the difference in the amount of radiation by the second amount of infrared radiation, or the like. In this embodiment, the detection frequency of the passive infrared detector is not infinitely decreased, and the detected small frequency is the sleep detection frequency.
In a specific embodiment, an intelligent terminal is installed on the security door, and the intelligent terminal is used for controlling the opening and closing of the door lock, is used for communication interaction with a matched mobile phone and the like, is also connected with the passive infrared detector, and can be opened or closed and the like through signals sent by the passive infrared detector. And a dry battery is also arranged to provide electric energy for the intelligent terminal and the passive infrared detector.
When the detection area of the passive infrared detector is nobody, the passive infrared detector collects the infrared radiation amount at a preset dormancy detection frequency. When a person enters a detection area of the passive infrared detector and is captured by the passive infrared detector, the detection frequency of the passive infrared detector can be increased according to a preset rule, specifically, when the person is captured by the passive infrared detector, a first infrared radiation amount acquired by a current time detection node and a second infrared radiation amount detected by a previous time detection node inevitably exist, and then the time interval of the detection frequency is shortened to a time length in which a value obtained by dividing a radiation amount difference value obtained by subtracting the second infrared radiation amount from the first infrared radiation amount by the first infrared radiation amount is shortened, so that the sensitivity of the passive infrared detector is improved. When the difference value of the radiation quantity obtained by subtracting the second infrared radiation quantity from the first infrared radiation quantity is a negative value, the fact that a person is far away from the passive infrared detector is proved, and too high detection sensitivity is not needed at the moment, so that the detection frequency of the passive infrared detector is reduced, energy consumption is saved, and the detection frequency can be reduced to the dormant detection frequency at the minimum.
According to the control method of the passive infrared detector, whether a person exists in a detection area of the passive infrared detector is judged, whether the person moves towards the passive infrared detector or moves away from the passive infrared detector is judged, the detection frequency of the passive infrared detector is adjusted, and when the person is far away from the passive infrared detector, the detection frequency can be controlled to be reduced, so that the energy consumption of the passive infrared detector is reduced; when a person approaches the passive infrared detector, the detection frequency can be controlled to increase, so that the sensitivity of the passive infrared detector is improved.
Referring to fig. 3, an embodiment of the present invention further provides a control apparatus for a passive infrared detector, including:
and the judging unit 10 is used for judging whether a person exists in the detection area of the passive infrared detector.
In the determining unit 10, the passive infrared detector is a device that passively receives the amount of infrared radiation, and when an animal or a person moves in the detection area, the passive infrared detector generates a corresponding signal according to the change of the amount of absorbed infrared radiation, so as to determine whether the detection area contains an animal or a person. The detection area is an effective detection area of the passive infrared detector.
The first executing unit 20 is configured to, if it is determined that a person is in the detection area of the passive infrared detector, adjust the detection frequency of the passive infrared detector according to a state that the person approaches or leaves the passive infrared detector.
In the first execution unit 20, the person in the detection area of the passive infrared detector generally has three states, the first state is a movement toward the passive infrared detector, the second state is a movement away from the passive infrared detector, and the third state is a standing position. In the third state, the passive infrared detector generally judges that no person exists because the amount of infrared radiation received by the passive infrared detector is unchanged or the variation amount is small; in the first and second states, the amount of infrared radiation received by the passive infrared detector changes significantly, so that the general direction of motion of the person in the detection area can be determined from the changed state. If the infrared detector moves away from the passive infrared detector, the detection frequency of the passive infrared detector can be reduced, so that the energy consumption is reduced; if the infrared detector moves towards the passive infrared detector, the detection frequency of the passive infrared detector can be increased, so that the detection sensitivity is improved.
And a second executing unit 30, configured to execute a preset sleep detection frequency if it is determined that the detection area of the passive infrared detector is not occupied.
In the second execution unit 30, the sleep detection frequency is a detection frequency executed after the passive infrared detector determines that the detection area is empty, and the sleep detection frequency is determined to meet the requirement of being detected by the passive infrared detector before the human approaches the passive infrared detector.
Referring to fig. 4, the determining unit 10 includes:
and the calculating module 11 is configured to subtract the first infrared radiation amount detected by the current time detection node from the second infrared radiation amount detected by the previous time detection node to obtain a radiation amount difference value.
In the calculation module 11, the current time detection node is a time node of the latest data acquisition. The last time detection node is the time node for collecting data last to the time node for collecting data last. The radiation quantity difference value can be a positive value or a negative value, and the movement direction of a person in the detection area of the passive infrared detector can be judged according to the positive value and the negative value. The calculating module 11 is used for calculating and obtaining the radiation quantity difference.
And the judging module 12 is configured to judge that a person is in the detection area of the passive infrared detector if the absolute value of the radiation amount difference is greater than the radiation amount threshold.
In the determination module 12, the threshold value of the radiation amount is an empirical threshold value, and is generally set by a manufacturer before shipment. Any object can radiate infrared rays, but the radiation amount is different, in addition, the radiation amount of the infrared rays radiated by the object is also related to the temperature, the higher the temperature is, the larger the infrared radiation amount is, therefore, the infrared radiation amount of the object in the environment where the passive infrared detector is located will also change, for example, the passive infrared detector is disposed on the intelligent terminal of the security door, and the security door is operated in 24 hours of a day, the temperature of the environment where the passive infrared detector is located can also change, for example, the temperature at noon is higher, the temperature at night is lower, and the like, so that the infrared radiation quantity collected by the passive infrared detector can also change, but the environment temperature and the like can not change suddenly but change slowly, therefore, the obtained radiation quantity difference value is small, and the setting of the radiation quantity threshold value is to eliminate the radiation quantity difference value obtained under the condition and to misjudge whether a person exists in the detection area.
Referring to fig. 5, in this embodiment, the first execution unit 20 includes:
the first executing module 21 is configured to determine that the person moves closer to the passive infrared detector and control the detection frequency of the passive infrared detector to increase if the radiation amount difference is a positive value and is greater than the radiation amount threshold;
and a second executing module 22, configured to determine that the person moves away from the passive infrared detector and control the detection frequency of the passive infrared detector to decrease if the radiation amount difference is a negative value and the absolute value of the radiation amount difference is greater than the radiation amount threshold.
In the first executing module 21 and the second executing module 22, because the radiation amount difference value is a positive value, it indicates that the first infrared radiation amount detected by the current time detecting node is greater than the second infrared radiation amount detected by the previous time detecting node, and it indicates that the infrared radiation amount collected by the passive infrared detector is relatively large, it can be determined that the heat source (human) is moving closer to the passive infrared detector, and on the contrary, the radiation amount difference value is a negative value, it indicates that the heat source is moving away from the passive infrared detector. When the heat source moves close to the passive infrared detector, the passive infrared detector is required to sensitively judge the moving state of the heat source, so that the detection frequency of the passive infrared detector is improved, and conversely, when the heat source moves far away from the passive infrared detector, the passive infrared detector is not required to sensitively judge the moving state of the heat source, so that the detection frequency of the passive infrared detector can be reduced, and the energy consumption of the passive infrared detector is reduced.
In this embodiment, the first executing module 21 includes:
the first execution submodule is used for controlling the time interval between adjacent time detection nodes of the passive infrared detector to be shortened according to a preset time length; or the second execution submodule is used for controlling the time interval of the adjacent time detection nodes of the passive infrared detector to be reduced according to the specified proportion of the radiant quantity difference value.
In the first execution submodule or the second execution submodule, the preset time length is a fixed time length, such as one millisecond. The above-mentioned reduction in the prescribed ratio according to the difference in the amount of radiation means that the difference in the amount of radiation is divided by a numerical value to obtain a reduced time length, for example, the reduced time length obtained by dividing the difference in the amount of radiation by the first amount of infrared radiation by the second execution submodule, or the reduced time length obtained by dividing the difference in the amount of radiation by the second amount of infrared radiation by the second execution submodule, or the like. In this embodiment, the detection frequency of the passive infrared detector will not increase infinitely, and a maximum upper limit value is set.
In this embodiment, the second executing module 22 includes:
the third execution submodule is used for controlling the time interval between adjacent time detection nodes of the passive infrared detector to increase according to the preset time length; or, the fourth execution submodule is used for controlling the time interval between adjacent time detection nodes of the passive infrared detector to increase according to the specified proportion of the radiant quantity difference.
In the third execution sub-module or the fourth execution sub-module, the preset time length is a fixed time length, such as one millisecond. The above-mentioned reduction according to the specified ratio of the radiation amount difference refers to dividing the radiation amount difference by a value to obtain the increased time length, for example, the increased time length obtained by dividing the radiation amount difference by the first infrared radiation amount by the fourth execution sub-module, or the increased time length obtained by dividing the radiation amount difference by the second infrared radiation amount by the fourth execution sub-module, etc. In this embodiment, the detection frequency of the passive infrared detector is not infinitely decreased, and the detected small frequency is the sleep detection frequency.
In a specific embodiment, an intelligent terminal is installed on the security door, and the intelligent terminal is used for controlling the opening and closing of the door lock, is used for communication interaction with a matched mobile phone and the like, is also connected with the passive infrared detector, and can be opened or closed and the like through signals sent by the passive infrared detector. And a dry battery is also arranged to provide electric energy for the intelligent terminal and the passive infrared detector.
When the determining unit 10 determines that the detection area of the passive infrared detector is empty, the second executing unit 30 controls the passive infrared detector to collect the infrared radiation amount at the preset dormancy detection frequency. When the determining unit 10 determines that a person enters the detection area of the passive infrared detector and is captured by the passive infrared detector, the first executing unit 20 increases the detection frequency of the passive infrared detector according to a preset rule, specifically, when the person is captured by the passive infrared detector, the first infrared radiation amount collected by the current time detection node and the second infrared radiation amount detected by the previous time detection node inevitably exist, and then the time interval of the detection frequency controlled by the second executing submodule is shortened to a time length shortened by dividing a radiation amount difference value obtained by subtracting the second infrared radiation amount from the first infrared radiation amount by a value obtained by dividing the first infrared radiation amount, so as to improve the sensitivity of the passive infrared detector. When the difference value of the radiation quantity obtained by subtracting the second infrared radiation quantity from the first infrared radiation quantity is a negative value, it indicates that a person is far away from the passive infrared detector, and at the moment, too high detection sensitivity is not needed, so that the fourth execution submodule controls to reduce the detection frequency of the passive infrared detector so as to save energy consumption, and the detection frequency can be reduced to the dormant detection frequency at the minimum.
According to the control device of the passive infrared detector, the judging unit 10 firstly judges whether a person exists in the detection area of the passive infrared detector, then judges whether the person moves towards the passive infrared detector or moves away from the passive infrared detector, and further adjusts the detection frequency of the passive infrared detector through the first executing unit 20; when a person approaches the passive infrared detector, the detection frequency can be controlled to increase, so that the sensitivity of the passive infrared detector is improved.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A control method of a passive infrared detector is characterized by comprising the following steps:
judging whether a person exists in a detection area of the passive infrared detector;
if the person is judged to be present, adjusting the detection frequency of the passive infrared detector according to the state that the person approaches or leaves the passive infrared detector;
and if no person is judged, executing a preset dormancy detection frequency.
2. The method for controlling a passive infrared detector according to claim 1, wherein the step of determining whether the detection area of the passive infrared detector is occupied comprises:
subtracting a second infrared radiation amount detected by a previous time detection node from a first infrared radiation amount detected by a current time detection node to obtain a radiation amount difference value;
and if the absolute value of the radiation quantity difference is larger than the radiation quantity threshold value, determining that the detection area of the passive infrared detector is occupied.
3. The method for controlling a passive infrared detector according to claim 2, wherein the step of adjusting the detection frequency of the passive infrared detector according to the state of the person approaching or leaving the passive infrared detector comprises:
if the radiation quantity difference value is a positive value and is greater than the radiation quantity threshold value, judging that the person moves close to the passive infrared detector, and controlling the detection frequency of the passive infrared detector to be increased;
and if the radiation quantity difference value is a negative value and the absolute value of the radiation quantity difference value is greater than the radiation quantity threshold value, judging that the person moves away from the passive infrared detector, and controlling the detection frequency of the passive infrared detector to be reduced.
4. The method according to claim 3, wherein the step of controlling the detection frequency of the passive infrared detector to become larger comprises:
controlling the time interval between adjacent time detection nodes of the passive infrared detector to be shortened according to a preset time length; or,
and controlling the time interval of adjacent time detection nodes of the passive infrared detector to be reduced according to the specified proportion of the radiant quantity difference.
5. The method for controlling a passive infrared detector according to claim 3, wherein the step of controlling the detection frequency of the passive infrared detector to be smaller comprises:
controlling the time interval between adjacent time detection nodes of the passive infrared detector to increase according to a preset time length; or,
and controlling the time interval of the adjacent time detection nodes of the passive infrared detector to increase according to the specified proportion of the radiant quantity difference.
6. A control device of a passive infrared detector is characterized by comprising:
the judging unit is used for judging whether a person exists in a detection area of the passive infrared detector;
the first execution unit is used for adjusting the detection frequency of the passive infrared detector according to the state that the person approaches or leaves the passive infrared detector if the detection area of the passive infrared detector is judged to be occupied;
and the second execution unit is used for executing the preset dormancy detection frequency if the detection area of the passive infrared detector is judged to be unmanned.
7. The apparatus for controlling a passive infrared detector according to claim 6, wherein the judging unit includes:
the calculation module is used for subtracting a second infrared radiation amount detected by a previous time detection node from a first infrared radiation amount detected by a current time detection node to obtain a radiation amount difference value;
and the judging module is used for judging that the detection area of the passive infrared detector is occupied if the absolute value of the radiation quantity difference is greater than the radiation quantity threshold.
8. The control device of a passive infrared detector according to claim 7, wherein the first execution unit comprises:
the first execution module is used for judging that the person moves close to the passive infrared detector and controlling the detection frequency of the passive infrared detector to be increased if the radiation quantity difference value is a positive value and is greater than the radiation quantity threshold value;
and the second execution module is used for judging that the person moves away from the passive infrared detector and controlling the detection frequency of the passive infrared detector to be reduced if the radiation quantity difference value is a negative value and the absolute value of the radiation quantity difference value is greater than the radiation quantity threshold value.
9. The apparatus for controlling a passive infrared detector according to claim 8, wherein the first executing module comprises:
the first execution submodule is used for controlling the time interval between adjacent time detection nodes of the passive infrared detector to be shortened according to a preset time length; or,
and the second execution submodule is used for controlling the time interval of adjacent time detection nodes of the passive infrared detector to be reduced according to the specified proportion of the radiant quantity difference value.
10. The control device of the passive infrared detector according to claim 8, wherein the second executing module comprises:
the third execution submodule is used for controlling the time interval between adjacent time detection nodes of the passive infrared detector to increase according to the preset time length; or,
and the fourth execution submodule is used for controlling the time interval of adjacent time detection nodes of the passive infrared detector to increase according to the specified proportion of the radiant quantity difference value.
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| CN108831084A (en) * | 2018-06-25 | 2018-11-16 | 深圳绿米联创科技有限公司 | Control method, apparatus and system based on passive type infrared human body sensor |
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| CN113419260A (en) * | 2021-06-17 | 2021-09-21 | 阳光新能源开发有限公司 | Photovoltaic module shaking detection method and device and photovoltaic power station system |
| CN116439575A (en) * | 2023-03-28 | 2023-07-18 | 芜湖美的智能厨电制造有限公司 | Control method of water purifying and drinking machine, water purifying and drinking machine and computer storage medium |
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