Door opening state detection system and smart home system

Abstract

The invention relates to a door opening state detection system and a smart home system, and belongs to the technical field of smart home, the door opening state detection system comprises a control module and a plurality of detection units electrically connected with the control module, and any detection unit comprises a signal shielding device and a passive electronic tag. The signal shielding device and the passive electronic tag of any detection unit are detachably arranged on a door frame and a door respectively, and the signal shielding device and the passive electronic tag of the same detection unit are attached to each other when the door is closed. The control module is electrically connected with a visual detection unit, the visual detection unit is used for shooting an image of the door and uploading the image to the control module, the control module judges the opening and closing state of the door according to the image, and the control module monitors the strength of a currently received signal when judging that the door is in a closed state according to the image; and taking the currently received signal strength as the door closing signal strength. The invention discloses a hanging basket construction state monitoring system based on BIM and Internet of Things.

Description

Technical Field

[0001] This invention belongs to the field of smart home technology, specifically relating to a door opening status detection system and a smart home system. Background Technology

[0002] With the development of smart homes, people have discovered that they can monitor the status of doors and remotely determine whether the door has been opened unplanned. As a result, the demand for accurate detection of door status is increasing.

[0003] Currently, door magnetic sensors are commonly used to detect the open / closed status of doors and windows. However, this technology has several drawbacks, such as the battery power, which limits the long-term usability of such solutions. To address this, Chinese Patent Publication CN117114031A discloses a door opening status detection system, comprising: passive electronic tags and signal shielding parts respectively installed on the door frame and door; the passive electronic tags and signal shielding parts are positioned differently but correspondingly, and when the door is closed, the passive electronic tags are covered by the signal shielding parts; the passive electronic tags receive radio frequency signals and generate induction signals; an induction antenna transmits radio frequency signals and receives induction signals; a tag reader determines the door opening status based on the induction signals; if the induction signal strength is greater than a preset strength, it outputs a door open signal; if the induction signal strength is less than or equal to the preset strength, it outputs a door closed signal. This solves the problem in existing technologies where insufficient door magnetic sensors cannot detect the open / closed status of doors and windows.

[0004] However, the above solutions do not fully consider the fluctuation interference of radio frequency signals in complex electromagnetic environments. For example, radio frequency signals may drift due to interference from surrounding metal objects, other wireless devices, or electromagnetic noise. In this case, the signal received by the control module when the door is closed will be different from the preset reference value. There is a probability that the control module will misjudge the signal emitted when the door is closed as the signal when the door is open, which will lead to misjudgment of the status. Therefore, a door status detection system and smart home system that can eliminate or reduce signal drift under fluctuation interference and has high status detection accuracy is needed. Summary of the Invention

[0005] To address the aforementioned problems in the existing technology, this invention provides a door opening status detection system and a smart home system, which features the ability to eliminate or reduce signal drift under fluctuation interference and high status detection accuracy.

[0006] The objective of this invention can be achieved through the following technical solutions: A door opening status detection system includes a control module and several detection units electrically connected to the control module. Each detection unit includes a signal jammer and a passive electronic tag. The signal jammer and the passive electronic tag of each detection unit are detachably mounted on the door frame and the door, respectively. The signal jammer and the passive electronic tag of the same detection unit are attached to each other when the door is closed. The passive electronic tag is used to receive signals transmitted by the control module and transmit signals to the control module after receiving the signals. When the signal shield is attached to the corresponding passive electronic tag, it shields the signals transmitted by the passive electronic tag. The control module is electrically connected to a vision detection unit. The control module commands the vision detection unit to start and stop. The vision detection unit is used to capture images of the door and upload them to the control module. The control module determines the open or closed state of the door based on the images. When the control module determines that the door is closed based on the images, it monitors the currently received signal strength and uses the currently received signal strength as the door closing signal strength.

[0007] As a preferred embodiment of the present invention, the control module is communicatively connected to a vibration sensor, which is installed on the door. The vibration sensor is used to monitor the vibrations received by the door and upload the vibration data to the control module. The control module is used to determine whether the vibration data exceeds a threshold and to stop receiving signals from the passive electronic tag when the vibration data exceeds the threshold.

[0008] As a preferred embodiment of the present invention, after receiving vibration data, the control module calculates the cumulative vibration over time, determines whether the cumulative vibration value exceeds a threshold, and extends the time for stopping the reception of signals from the passive electronic tag when the threshold is exceeded.

[0009] As a preferred embodiment of the present invention, after receiving the vibration data Z, the control module generates a function F(t) of the amplitude data changing with time and calculates the cumulative vibration J over time. It then extends the time for ceasing to receive signals from the passive electronic tag by a factor of A1, where A1 = J / J0 × c, and J = t0 is the cumulative value acquisition time, J0 is the pre-input baseline cumulative value, and c is the pre-input adjustment coefficient.

[0010] As a preferred embodiment of the present invention, the control module is electrically connected to an environmental sensor. The environmental sensor is used to monitor the temperature and humidity around itself and upload the temperature and humidity data to the control module. The control module is used to determine whether the fluctuation of temperature and humidity exceeds a threshold, and if the threshold is exceeded, extend the time for stopping the reception of signals from the passive electronic tag.

[0011] As a preferred embodiment of the present invention, the environmental sensor is used to monitor the temperature and humidity around itself and upload the temperature and humidity data to the control module. The control module is used to calculate the degree of temperature and humidity fluctuation based on the variance FW of the uploaded temperature data and the variance FS of the uploaded humidity data, and to extend the time for stopping receiving signals from the passive electronic tag by A2 times, where A2=(FW / F0+FS / F0)×d, F0 is a preset reference variance value, and d is a preset adjustment coefficient.

[0012] The present invention also provides a smart home system, characterized in that: it includes the above-mentioned door opening status detection system, and further includes a communication module, wherein the communication module is electrically connected to the control module, the communication module is communicatively connected to a terminal, and the control module is used to send the door opening status detection result to the terminal through the terminal.

[0013] The beneficial effects of this invention are as follows: (1) By setting up a visual detection unit to monitor the opening and closing status of the door, and making the control module monitor the current signal strength when judging that the door is closed based on the image, and using the current signal strength as the reference value of the closing signal strength, even if the signal drifts at this time, the control module uses the drifted signal strength as the reference value for subsequent comparison, avoiding misjudgment caused by environmental electromagnetic fluctuations. (2) By setting up a vibration sensor to monitor the vibration of the door, when vibration occurs, the signal shield and the passive electronic tag are temporarily separated and the signal cannot be effectively shielded. The control module may receive the signal of the passive electronic tag again when the door is closed and mistakenly judge that the door is open. At this time, the vibration sensor detects the vibration of the door. When the vibration data exceeds the threshold and it is judged that the vibration is making a sound and may interfere with the judgment, the signal of the passive electronic tag is stopped. The signal reception is resumed after the vibration ends, which reduces the probability of misjudgment due to vibration. (3) By having the control module calculate the cumulative vibration over time after receiving the vibration data, the accuracy of vibration judgment is improved. This avoids the control module stopping signal reception when short-term, small-amplitude vibrations occur, which have little impact on signal acquisition, thus making it impossible to detect whether the door is open. At the same time, when there is significant signal interference due to large-amplitude or long-term vibration, the time for stopping signal reception is extended to ensure that the probability of misjudgment is reduced in complex vibration environments. (4) By monitoring the ambient temperature and humidity parameters using an environmental sensor, when the temperature and humidity fluctuate greatly and there is a probability that the signal transmission and reception will be affected and misjudged, the control module extends the time for stopping the reception of the passive electronic tag signal. Attached Figure Description

[0014] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0015] Figure 1 This is a block diagram of the control loop of the present invention. Detailed Implementation

[0016] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0017] Please see Figure 1 A door opening status detection system and a smart home system include a control module and several detection units electrically connected to the control module. Each detection unit includes a signal jammer and a passive electronic tag. The signal jammer and the passive electronic tag of each detection unit are detachably mounted on the door frame and the door, respectively. The signal jammer and the passive electronic tag of the same detection unit are attached to each other when the door is closed. The passive electronic tag is used to receive signals transmitted by the control module and transmit signals to the control module after receiving the signals. When the signal shield is attached to the corresponding passive electronic tag, it shields the signals transmitted by the passive electronic tag. Specifically, each passive electronic tag and signal jammer is equipped with a structure that can be detachably connected to the door frame or door, such as an adhesive plate or a magnetic plate. In this case, the passive electronic tag and signal jammer are fixed to the door frame or door by adhesive or magnetic attraction. The installation positions of the signal jammer and passive electronic tag, which belong to the same detection unit, are ensured to fit tightly when the door is closed. This ensures that the signal jammer effectively blocks the signal feedback of the passive electronic tag. Specifically, the signal jammer is made of metal shielding material, which effectively blocks the electromagnetic signal of the passive electronic tag. The passive electronic tag has a metal plate on the side of the door frame or door near itself. When the door is closed, the metal plate and the signal jammer wrap around the passive electronic tag from both sides to form a closed shielding structure, thus blocking the signal. The control module sends signals in real time. When the passive electronic tag receives the signal sent by the control module, it generates a sensing signal. The control module determines whether the door is open by whether it can receive the sensing signal. However, in some cases, the radio frequency signal is affected by interference from surrounding metal objects, other wireless devices or electromagnetic noise, causing signal drift. This can lead the control module to misjudge the door's open or closed state. For example, when the door is not open, the control module may mistake the weak signal it is currently capturing as a normal response from a passive electronic tag due to signal drift, thus misjudging that the door is open. For this purpose, the control module is electrically connected to a vision detection unit. The control module commands the vision detection unit to start and stop. The vision detection unit is used to capture images of the door and upload them to the control module. The control module determines the open or closed state of the door based on the images. When the control module determines that the door is in a closed state based on the images, it monitors the currently received signal strength and uses the currently received signal strength as the door closing signal strength. Optionally, when the reception of signals from the passive electronic tag stops, the visual detection unit is simultaneously triggered to acquire images; Optionally, the control module periodically commands the visual detection unit to start and stop, and the start and stop frequency is preset or dynamically adjusted according to the frequency of door opening and closing status changes; When the control module uses the currently received signal strength as the door closing signal strength, it is essentially equivalent to dynamically adjusting the reference benchmark for subsequent comparison. Even if signal drift occurs, when the door closing signal strength after signal drift is used as the benchmark, the difference between abnormal signal fluctuations and the actual door opening response can still be identified. By setting up a visual detection unit to monitor the opening and closing status of the door, and enabling the control module to monitor the current signal strength when determining that the door is closed based on the image, the current signal strength is used as the reference value for the closing signal strength. Even if the signal drifts at this time, the control module uses the drifted signal strength as the reference value for subsequent comparison, avoiding misjudgments caused by environmental electromagnetic fluctuations.

[0018] In addition to signal drift, there is also the possibility of signal misalignment with door opening and closing status caused by vibration. For example, when the door vibrates, the signal shield may also undergo slight displacement due to the vibration, making it unable to effectively shield the signal. This causes the passive electronic tag to emit a signal when the door is closed. If the control module judges the signal based on this, it may mistakenly believe that the door has been opened. For this purpose, the control module is connected to a vibration sensor, which is installed on the door. The vibration sensor is used to monitor the vibration of the door and upload the vibration data to the control module. The control module is used to determine whether the vibration data exceeds a threshold and to stop receiving signals from the passive electronic tag when the vibration data exceeds the threshold. Each time the control module receives vibration data, it determines whether the vibration data exceeds the threshold. If the result is yes, the control module stops receiving signals from the passive electronic tag for a period of time until the vibration data falls back below the threshold. It then combines the images collected by the visual detection unit to confirm the true state of the door, thus avoiding misjudgments caused by vibration. The duration for which signal reception is stopped is determined by a pre-input parameter. By setting up a vibration sensor to monitor the vibration of the door, when vibration occurs, the signal shield and the passive electronic tag are temporarily separated, and the signal shielding can no longer be effectively blocked. The control module may receive the signal from the passive electronic tag again when the door is closed and mistakenly judge that the door is open. At this time, the vibration sensor detects the vibration of the door. When the vibration data exceeds the threshold and it is determined that the vibration is making a sound and may interfere with the judgment, the sensor stops receiving the signal from the passive electronic tag. The signal reception is resumed after the vibration ends, which reduces the probability of misjudgment due to vibration.

[0019] Under different conditions, the vibration amplitude of the door is different. When the vibration amplitude is small, the impact on the signal jammer is also small. At this time, a shorter stop signal reception time can be set. When the vibration amplitude is large, the possibility of the jammer displacement increases. The stop signal reception time should be extended to ensure accurate judgment. To this end, after receiving the vibration data, the control module calculates the accumulation of vibration over time and judges whether the accumulated vibration value exceeds the threshold. If it exceeds the threshold, the stop signal reception time of the passive electronic tag is extended. Specifically, after receiving the vibration data Z, the control module generates a function F(t) showing the amplitude data changing over time and calculates the cumulative vibration J over time. It then extends the time for ceasing signal reception from the passive electronic tag by a factor of A1, where A1 = J / J0 × c, and J = t0 is the cumulative value acquisition time, J0 is the pre-input baseline cumulative value, and c is the pre-input adjustment coefficient; By having the control module calculate the cumulative vibration over time after receiving vibration data, the accuracy of vibration judgment is improved. This avoids the situation where the control module stops receiving signals and thus cannot detect whether the door is open when short-term, small-amplitude vibrations occur, which have little impact on signal acquisition. At the same time, when there is significant signal interference due to large-amplitude or long-term vibration, the time for stopping signal reception is extended, ensuring a lower probability of misjudgment in complex vibration environments.

[0020] The environment can affect signal monitoring under different conditions; for example, drastic fluctuations in temperature and humidity can also have an impact. The control module is electrically connected to an environmental sensor, which monitors the temperature and humidity around itself and uploads the temperature and humidity data to the control module. The control module determines whether the fluctuation of temperature and humidity exceeds a threshold, and extends the time for stopping the reception of signals from the passive electronic tag when the threshold is exceeded. In this embodiment, the environmental sensor is used to monitor the temperature and humidity around itself and upload the temperature and humidity data to the control module. The control module is used to calculate the degree of temperature and humidity fluctuation based on the variance FW of the uploaded temperature data and the variance FS of the humidity data, and to extend the time for stopping the reception of the passive electronic tag signal by A2 times, where A2=(FW / F0+FS / F0)×d, F0 is the preset benchmark variance value, and d is the preset adjustment coefficient.

[0021] When the ambient temperature and humidity fluctuate more, it means that the signal propagation environment may change significantly. At this time, the stability of the passive electronic tag echo signal is easily interfered with. A2 increases with the intensity of environmental fluctuations, which in turn prolongs the time when the signal is no longer received.

[0022] By monitoring ambient temperature and humidity parameters using environmental sensors, when temperature and humidity fluctuations are high and may affect signal transmission and reception, leading to misjudgments, the control module extends the time during which it stops receiving signals from passive electronic tags.

[0023] The present invention also provides a smart home system, including the above-mentioned door opening status detection system, and further including a communication module. The communication module is electrically connected to the control module, and the communication module is communicatively connected to a terminal. The control module is used to send the door opening status detection result to the terminal through the terminal.

[0024] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A door opening status detection system, characterized in that: The system includes a control module and several detection units electrically connected to the control module. Each detection unit includes a signal jammer and a passive electronic tag. The signal jammer and the passive electronic tag of each detection unit are detachably mounted on the door frame and the door, respectively. The signal jammer and the passive electronic tag of the same detection unit are attached to each other when the door is closed. The passive electronic tag is used to receive signals transmitted by the control module and transmit signals to the control module after receiving the signals. When the signal shield is attached to the corresponding passive electronic tag, it shields the signals transmitted by the passive electronic tag. The control module is electrically connected to a vision detection unit. The control module commands the vision detection unit to start and stop. The vision detection unit is used to capture images of the door and upload them to the control module. The control module determines the open or closed state of the door based on the images. When the control module determines that the door is closed based on the images, it monitors the currently received signal strength and uses the currently received signal strength as the door closing signal strength.

2. The door opening status detection system according to claim 1, characterized in that: The control module is communicatively connected to a vibration sensor, which is installed on the door. The vibration sensor is used to monitor the vibrations experienced by the door and upload the vibration data to the control module. The control module is used to determine whether the vibration data exceeds a threshold and to stop receiving signals from the passive electronic tag when the vibration data exceeds the threshold.

3. The door opening status detection system according to claim 2, characterized in that: After receiving the vibration data, the control module calculates the cumulative vibration over time and determines whether the cumulative vibration value exceeds a threshold. If the value exceeds the threshold, the time for stopping the reception of signals from the passive electronic tag is extended.

4. The door opening status detection system according to claim 3, characterized in that: After receiving the vibration data Z, the control module generates a function F(t) showing the amplitude data changing over time and calculates the cumulative vibration J over time. It then extends the time for ceasing signal reception from the passive electronic tag by a factor of A1, where A1 = J / J0 × c, and J = t0 is the cumulative value acquisition time, J0 is the pre-input baseline cumulative value, and c is the pre-input adjustment coefficient.

5. The door opening status detection system according to claim 4, characterized in that: The control module is electrically connected to an environmental sensor, which monitors the temperature and humidity around itself and uploads the temperature and humidity data to the control module. The control module determines whether the fluctuation of temperature and humidity exceeds a threshold, and extends the time for stopping the reception of signals from passive electronic tags when the threshold is exceeded.

6. The door opening status detection system according to claim 5, characterized in that: The environmental sensor is used to monitor the temperature and humidity around itself and upload the temperature and humidity data to the control module. The control module is used to calculate the degree of temperature and humidity fluctuation based on the variance FW of the uploaded temperature data and the variance FS of the humidity data, and to extend the time for stopping receiving signals from the passive electronic tag by A2 times, where A2=(FW / F0+FS / F0)×d, F0 is the preset baseline variance value, and d is the preset adjustment coefficient.

7. A smart home system, characterized in that: The system includes a door opening status detection system according to any one of claims 1 to 6, and further includes a communication module, wherein the communication module is electrically connected to the control module, the communication module is communicatively connected to a terminal, and the control module is used to send the door opening status detection result to the terminal through the terminal.

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