CN110645685B - Security monitoring method and device based on fresh air machine - Google Patents

Security monitoring method and device based on fresh air machine Download PDF

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Publication number
CN110645685B
CN110645685B CN201810678007.7A CN201810678007A CN110645685B CN 110645685 B CN110645685 B CN 110645685B CN 201810678007 A CN201810678007 A CN 201810678007A CN 110645685 B CN110645685 B CN 110645685B
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alarm
concentration
pollutant
fresh air
sensor
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CN110645685A (en
Inventor
张占鹏
曹光杰
许瑞斌
张建东
贾志恒
张英舟
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Honeywell Environmental and Combustion Controls Tianjin Co Ltd
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Honeywell Environmental and Combustion Controls Tianjin Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/50—Air quality properties
    • F24F2110/64—Airborne particle content
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/50—Air quality properties
    • F24F2110/65—Concentration of specific substances or contaminants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/50—Air quality properties
    • F24F2110/65—Concentration of specific substances or contaminants
    • F24F2110/66—Volatile organic compounds [VOC]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/50—Air quality properties
    • F24F2110/65—Concentration of specific substances or contaminants
    • F24F2110/70—Carbon dioxide

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)
  • Fire Alarms (AREA)

Abstract

The invention discloses a security monitoring method and device based on a fresh air machine. The method comprises the following steps: a. monitoring the concentration of one or more indoor gaseous pollutants in real time; b. if the monitored duration time of the pollutant concentration is less than the pollutant concentration threshold value Thc and reaches the pollutant time threshold value Tht, calculating the mean value A and the dispersion degree D of the latest M sampling values of the pollutant concentration, and otherwise, returning to the step a; c. if the degree of dispersion D monitored during a certain time t remains at the threshold degree of dispersion ThDIf the average value A is increased, the event triggering condition corresponding to the gas pollutant is met, and corresponding alarm is given. The invention also discloses a security monitoring device for realizing the method.

Description

Security monitoring method and device based on fresh air machine
Technical Field
The invention relates to the field of security monitoring, in particular to a security monitoring method and device based on a fresh air machine.
Background
The fresh air system makes great contribution to the life of human beings since birth. The fresh air system sends outdoor fresh air to the indoor after being processed, simultaneously discharges indoor dirty air to the outdoor, has also carried out the replacement of air to the room when reaching indoor outer equilibrium, makes a confined space realize scientific air convection, and it equals to increased a respiratory for the room. At present, the functions of the fresh air system are increasingly perfected, and more families choose to configure the fresh air system to bring good-quality air to the indoor environment. On one hand, the air brought by the fresh air system is rich in gases such as oxygen and negative ions which are beneficial to human bodies, and on the other hand, the air is also suitable for temperature and humidity, has no dust and no gas components harmful to human bodies.
Meanwhile, the use of the intelligent security monitoring system in common families is also gradually popularized. The intelligent security monitoring system and various sensors, detectors, networks and actuators arranged in a household form a household security system, and is the 'brain' of the household security system. The monitoring functions can include functions of fire, invasion, gas leakage, emergency help and the like, and the monitoring system adopts an advanced intelligent control network technology and is managed and controlled by a microcomputer, so that automatic monitoring, recording, alarming and emergency treatment of certain accidents are realized.
However, at present, the two systems in the home application are generally two independent systems, each of which performs an independent function, and an effective unified configuration means and a unified management terminal are lacked.
Disclosure of Invention
The invention provides a security monitoring method and device based on a fresh air machine. In order to achieve the purpose, the fresh air system is combined with various sensors to achieve various security monitoring functions, and monitoring results can be correspondingly processed and recorded and pushed to various terminal devices.
The invention adopts the following technical scheme:
a security monitoring method based on a fresh air machine comprises the following steps:
a. monitoring the concentration of one or more indoor gaseous pollutants in real time;
b. if the monitored duration time of the pollutant concentration is less than the pollutant concentration threshold value Thc and reaches the pollutant time threshold value Tht, calculating the mean value A and the dispersion degree D of the latest M sampling values of the pollutant concentration, and otherwise, returning to the step a;
c. and if the monitored discrete degree D is kept above a discrete degree threshold value ThD within a certain time t and the average value A is increased, meeting an event triggering condition corresponding to the gas pollutants and giving corresponding alarm.
According to the method of the invention, after step a and before step c, the following steps are also included: monitoring the outdoor concentration of the gaseous pollutant, and returning to the step a if the outdoor concentration is greater than or equal to the indoor concentration of the pollutant.
The method according to the invention, wherein said gaseous contaminant comprises carbon dioxide and said alarm is an intrusion alarm.
The method according to the invention, wherein the gaseous pollutants comprise carbon dioxide and one or more of PM2.5, PM10, TVOC sensors and temperature sensors, and the alarm is a fire alarm.
The method according to the invention, wherein the degree of dispersion is measured by one or more of the following indicators: least squares fit slope, variance, standard deviation, range, mean, and interquartile range.
According to the method of the invention, when a corresponding alarm is made, the concentration value of the pollutant triggering the alarm at the moment is recorded and the latest concentration values of the pollutant are recorded periodically, if the difference obtained by subtracting the average value of the latest concentration values of the pollutant from the concentration value of the pollutant recorded when the alarm event occurs is smaller than the confirmation threshold value of the pollutant for a certain time or the difference continuously decreases for a certain time, the alarm is released.
According to the method of the invention, after a corresponding alarm is made, the indoor pollutant concentration value and the corresponding outdoor pollutant concentration value triggering the alarm are periodically recorded, and if the difference obtained by subtracting the outdoor pollutant concentration value from the indoor pollutant concentration value is smaller than the confirmation threshold value of the pollutant for a certain time or the difference continuously decreases for a certain time, the alarm is released.
The method according to the invention, wherein the threshold value ThD of the degree of dispersion of carbon dioxide is calculated by:
ThD = S/V；
wherein S is the volume of carbon dioxide exhaled by an object to be monitored in unit time, and V is the volume of the working space of the fresh air fan.
According to the method of the present invention, in the case that the working space volume V of the new fan is unknown, a value P of a certain pollutant at a certain time after the device is turned on may be recorded, and a value C of the pollutant may be recorded for a second time after the device is operated for a certain time t, where V may be estimated by the following formula in the case that P > C:
V = k×P×F×t/(P-C)；
wherein k is the efficiency coefficient (0 < k < 1) of the local circulation of the fresh air and the return air caused by the fresh air machine, and F is the working air volume of the equipment.
According to the method, the temperature of the air return opening of the fresh air fan and the temperature of the air inlet are monitored within a certain monitoring time after the fire alarm is carried out, if the difference value obtained by subtracting the temperature of the air inlet from the temperature of the air return opening is continuously increased within the monitoring time for a certain time, the fresh air fan is closed and a fire log is recorded, otherwise, the fire alarm is released after the monitoring time.
The method according to the invention, wherein said alarm comprises one or more of the following: pushing corresponding alarm information, starting a sound alarm and starting emergency equipment.
The present invention also discloses a fresh air machine based security monitoring apparatus comprising one or more of a carbon dioxide sensor, a PM2.5 sensor, a PM10 sensor, a TVOC sensor, and a temperature sensor, the security monitoring apparatus further comprising a computing device comprising a processor and a memory, the memory having stored thereon computer executable code configured to, when executed on the processor, cause the computing device to perform the method of any of claims 1-11.
According to the above content, the invention provides a security monitoring method and device based on a fresh air machine. Advantages of the present invention include, but are not limited to: the reliable indoor security monitoring function is realized by the flexible combination of one set of fresh air handling equipment and the corresponding sensor.
The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below. Other features and advantages will be apparent from the accompanying drawings and from the detailed description, and from the claims.
Drawings
Fig. 1 illustrates a message topology of a new fan in a home intelligent network according to an embodiment of the present invention;
FIG. 2 illustrates various installations of a fresh air machine according to embodiments of the present invention;
FIG. 3 illustrates a flow diagram of a contaminant monitoring process according to an embodiment of the invention;
FIG. 4 illustrates a flow chart for making a fire alarm determination according to an embodiment of the present invention;
FIG. 5 illustrates a computing device for performing the methods of the present invention, in accordance with an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments that can be derived from the embodiments given herein by a person of ordinary skill in the art are intended to be within the scope of the present disclosure.
The invention may be implemented in numerous ways, such as being implemented as an apparatus, a method, a computer program product. In general, the order of the steps of disclosed processes may be altered within the scope of the invention unless otherwise indicated.
A detailed description of embodiments of the invention is provided below along with accompanying figures that illustrate the principles of the invention. While the invention will be described in conjunction with such embodiments, the invention is not limited to any embodiment. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. The details are provided for the purpose of example and the invention may be practiced according to the claims without some or all of these specific details. For the purpose of clarity, techniques known in the art to which the invention relates have not been described in detail so as not to obscure the invention.
The invention discloses a security monitoring device based on a fresh air machine, and fig. 1 shows a connection topology structure diagram of the fresh air machine in a home intelligent network according to an embodiment of the invention. As shown in fig. 1, the new air blower may be connected to the cloud through any connection means (such as WiFi, etc.), and/or connected to the home intelligent gateway through any connection means (such as RS485, 433, wireless mesh network, etc.), and further connected to the cloud through the intelligent gateway. The cloud can push alarm information to a home intelligent terminal and a user mobile phone. The home intelligent gateway can also be connected with other security sensors in any mode, so that information returned by various sensors in a room is acquired, and the information is routed to a new fan and a cloud. The new fan, the home intelligent gateway and other security sensors can be connected with each other in the home local area network and connected to the cloud. It should be understood that fig. 1 is only a schematic illustration, and the connection relationship and message flow direction between the parts are not limited to the arrows in the figure. For example, the user mobile phone may also be directly connected to the home intelligent gateway without passing through the cloud, and the new air conditioner may also transmit messages to other security sensors through the home intelligent gateway.
In one embodiment, the new fan of the present invention may be configured with one or more of a carbon dioxide sensor, a PM2.5 sensor, a PM10 sensor, a TVOC sensor, and a temperature sensor. FIG. 2 illustrates various installations of a fresh air machine according to embodiments of the present invention. The dark colored boxes in fig. 2 represent a fresh air machine having an air inlet and an air outlet on the outdoor side and a return air inlet and a fresh air inlet on the indoor side. When the air conditioner works, air is sucked from an outdoor air inlet through the motor, and fresh air is exhausted from an indoor fresh air inlet after being filtered and subjected to heat exchange; meanwhile, air is sucked at an indoor air return port and is exhausted outdoors from an air outlet after heat exchange inside the fresh air machine, so that the indoor and outdoor air exchange process is completed.
Fig. 2A is a built-in installation manner of a new fan sensor according to an embodiment of the invention. In fig. 2A, one or more of a carbon dioxide sensor, a PM2.5 sensor, a PM10 sensor (not shown), a TVOC sensor (not shown), and a temperature sensor (not shown) are disposed at (or near) the return duct outlet inside the fresh air machine.
Alternatively, as shown in fig. 2B, one or more of the carbon dioxide sensor, PM2.5 sensor, PM10 sensor (not shown), TVOC sensor (not shown), and temperature sensor (not shown) may be located outside of the fresh air machine, such as disposed indoors. These sensors may be communicatively connected to the fresh air machine, collecting indoor pollutant data in real time and sending to the fresh air machine via current analog or UART communications (fig. 2C). Of course, pollution data may also be collected by sensors and sent to the new wind turbine through the home intelligent gateway via a local area network, as shown in fig. 1. The advantage of the external arrangement of the sensor in fig. 2B is that any of various sensors with corresponding functions can be freely arranged by the user in various places in the room, and the coupling between the sensor and the new air blower can be chosen in various ways, for example, by wire or wirelessly, for example, by communication traffic or electrical connection, as long as the interface requirements and corresponding communication protocols for coupling with the new air blower are met. In addition, another advantage of the sensor being disposed indoors is that an indoor air abnormality can be detected early without waiting for the abnormal air to propagate to the return air opening.
Alternatively, as shown in fig. 2C, one or more of the carbon dioxide sensor, PM2.5 sensor, PM10 sensor (not shown), TVOC sensor (not shown), and temperature sensor (not shown) may be mounted outside the fresh air fan as standard options for the fresh air fan and connected to the return air inlet and/or the intake air inlet. New fan manufacturer can provide this type of standard option spare, by user's option installation, its advantage lies in that the user disposes by oneself as required, can reduce use cost in a flexible way, improves equipment competitiveness to the sensor can be dismantled, and the user of being convenient for clears up sensor equipment by oneself in daily use. Additionally, as shown in FIG. 2C, one or more of the carbon dioxide sensor, PM2.5 sensor (not shown), PM10 sensor (not shown), TVOC sensor (not shown), and temperature sensor (not shown) may also be provided at the air intake (or outdoors).
It should be noted that fig. 2A, 2B and 2C are only intended to illustrate different installation manners of the contamination monitoring sensor, and the details of the arrangement, connection relationship and the like thereof are not limited to a specific installation manner. For example, for simplicity, only a carbon dioxide sensor and a PM2.5 sensor are shown in FIG. 2, however sensors that may be installed include any sensor that can monitor air pollution, such as a PM10 sensor, a TVOC sensor, and the like. For example, an example of mounting a PM2.5 sensor at the air intake is shown only in fig. 2C, but it will be understood by those skilled in the art that this configuration is equally possible with the mounting of fig. 2A and 2B, and that any type of sensor capable of monitoring outdoor air quality, such as a carbon dioxide sensor, a PM10 sensor, a TVOC sensor, and a temperature sensor, may be mounted as well. For example, the current analog communication scheme of fig. 2B and the UART communication scheme of fig. 2C are also merely exemplary descriptions, and are not intended to limit the specific communication scheme to a specific embodiment, but any suitable communication scheme may be used in any embodiment.
In one embodiment, the sensors can monitor the concentration of the corresponding pollutant in the indoor air in real time under the working state of the fresh air fan, and if the monitored pollutant concentration is less than the pollutant concentration threshold ThcReaches a time threshold Th for the contaminanttThen the calculation of the mean a and the dispersion D of the latest M samples of the contaminant concentration is started, otherwise the contaminant concentration is continuously monitored. If the degree of dispersion D monitored during a certain time t remains at the threshold degree of dispersion ThDIf the mean value A is increased, the event triggering condition corresponding to the gas pollutant is satisfied, and the condition is satisfiedAnd carrying out corresponding alarm. A flow chart of the above process is shown in fig. 3. Preferably, in the case where a corresponding outdoor sensor is provided and available, the value of the outdoor sensor may be compared with the corresponding indoor value, and if the indoor parameter is greater than the outdoor parameter, it may be interpreted that an abnormality exists in the room, otherwise, the existence of the abnormality cannot be determined, and then returning to the initial continuous monitoring of the contaminants. This configuration is advantageous, for example, in the case where the pollution source is located outdoors, pollutants from the activities such as burning straws in the open air may enter the room through the fresh air system, and the false alarm of indoor abnormality can be avoided by determining that the indoor pollutant concentration is less than the outdoor pollutant concentration.
In a further embodiment, by means of the sensor configured to be able to monitor outdoor air quality as described above, the outdoor concentration of the gaseous pollutant may be monitored, and if the outdoor concentration is greater than or equal to the indoor concentration of the pollutant, the pollutant concentration continues to be monitored without alarming.
In one embodiment, where the sensor comprises a carbon dioxide sensor, intrusion monitoring functionality may be implemented. If people suddenly move in the closed space, the concentration of the carbon dioxide will rise, and whether an invasion event occurs or not can be judged according to the reading change of the carbon dioxide sensor in the fresh air machine. For example, when the duration that the monitored carbon dioxide concentration is less than the carbon dioxide concentration threshold reaches the time threshold corresponding to carbon dioxide, linear fitting may be performed on the latest M sampling values of the indoor carbon dioxide concentration with respect to time, so as to obtain the change rate of the carbon dioxide concentration in unit time. If the change rate is larger than the threshold value of the carbon dioxide concentration change rate and the change trend is that the carbon dioxide concentration is increased, the intrusion event in the monitored area can be judged to occur, and then corresponding alarm processing is carried out. The flow of this process may be as shown in fig. 3. Preferably, where an outdoor carbon dioxide sensor is provided and available, the value of the outdoor sensor may be compared with the indoor corresponding value, and if the indoor parameter is greater than the outdoor parameter, this indicates that there may be an intrusion in the room, otherwise the presence of an intrusion cannot be determined, and then return is made to the initial continuous monitoring of the carbon dioxide concentration. This configuration is advantageous, for example, in the case where the pollution source is located outdoors, carbon dioxide from an action such as outdoor incineration may enter the room through the fresh air system, and at this time, by judging that the indoor carbon dioxide concentration is smaller than the outdoor carbon dioxide concentration, a false alarm of indoor intrusion can be avoided.
Assuming that the volume of carbon dioxide exhaled by a subject per unit time to be monitored is S (for example, an adult with 60KG exhales about 380ml of carbon dioxide per minute, S =380ml is preferably selected), the room space volume (working space volume) where the fresh air fan is located is V, and the carbon dioxide concentration per minute is changed to S/V, the threshold value of the carbon dioxide concentration change rate may be defined as follows:
ThD = S/V
from the above equation, it can be seen that the threshold value of the carbon dioxide concentration change rate is related to the room space volume V where the new fan is located. The working space of the fresh air machine can be obtained by adopting the following method: for the new fan of the networking type, a user can manually set the corresponding room area and floor height of the new fan or directly set a volume value, so that the volume of the working space of the new fan is configured. For a non-network-connected new fan or under the condition that the volume of a working space is not obtained, the PM2.5 value P (only taking PM2.5 parameters as an example, other indexes can be selected) at a certain moment after the equipment is started can be recorded, the PM2.5 value C is recorded for the second time after the equipment works for a certain time t, and the working air volume of the equipment is assumed to be F m3The efficiency coefficient of the fresh air fan for causing partial circulation of fresh air and return air is k (0)<k<1). At P>C, the new fan working space volume V can be estimated according to the following equation. The operating air volume may be defined, for example, by the product of the wind speed and the cross-sectional area of the air path. The efficiency coefficient k of the above-mentioned local circulation describes the situation that a part of the fresh air sucked by the fresh air fan from the outdoor is discharged to the outdoor through the air outlet without being fully mixed, thereby causing the time of once air replacement in the whole room to be prolonged, and in practice, the coefficient can be obtained through actual measurement. For example, for a given fresh air handling system,the unit volume of air may be purged to achieve a predetermined contaminant concentration, and the ratio of the actual time to the ideal time used reflects k. Especially, in the case of, for example, a wall-mounted fresh air blower, the distance between the air outlet and the air inlet may be short, and at this time, the influence of k on the working space V needs to be considered more. For example, assuming that 20% of fresh air is directly discharged through the outlet without being mixed with the indoor air, k = 0.8. The index is related to the positions of the air inlet and the air outlet of the equipment, the design of the air outlet and the air speed parameter. Where t may be chosen, for example, to be 8 hours, 24 hours, or other suitable values based on practical experience.
V = k×P×F×t/(P-C)
In one embodiment, alternatively, when the duration that the monitored carbon dioxide concentration is less than the carbon dioxide concentration threshold reaches the time threshold corresponding to the carbon dioxide, a standard deviation may be calculated for the latest M sampling values of the indoor carbon dioxide concentration, and if the calculated standard deviation is greater than the carbon dioxide concentration standard deviation threshold and the change trend is that the carbon dioxide concentration increases, it may be determined that an intrusion event occurs in the monitored area, and then corresponding alarm processing is performed. Alternatively, parameters such as variance, range, average difference or quartile range, which represent the degree of data dispersion, can be solved for the latest M sampled values of the indoor carbon dioxide concentration, so as to determine whether the carbon dioxide variation amplitude is sufficient to indicate the occurrence of an intrusion event in the monitored area. The threshold value corresponding to the parameter describing the degree of dispersion may be an empirical parameter related to the working space volume, or may be obtained through theoretical calculation or experiment.
In one embodiment, a fire monitoring function may be implemented where the sensors include a carbon dioxide sensor and one or more of a PM2.5, PM10, and TVOC sensor and a temperature sensor. Since the fire is often accompanied by the increase of carbon dioxide concentration, the generation of smoke, the generation of organic pollutants and the increase of temperature, the carbon dioxide sensor, the PM2.5 sensor, the PM10 sensor, the TVOC sensor and the temperature sensor in the fresh air machine can be used for reflecting the change of the indexes, thereby indicating the occurrence of the fire. The flow of fire alarm determination by the fresh air system is shown in fig. 4. Whether the carbon dioxide concentration is rapidly exceeded is first determined according to the flow described above (shown in fig. 3), which is similar to the determination of whether an intrusion has occurred as described above, but the specific threshold selection may be different from the threshold for the intrusion determination. If the carbon dioxide concentration is rapidly exceeded, the logic of the process may still be similar to the flow chart of fig. 3 and the above description related to intrusion determination, and the specific threshold may be determined by empirical parameters or experiments, depending on whether the configured ultrasound transducer sensor is configured to continuously determine whether other pollutants (e.g., PM2.5, PM10, TVOC, etc.) or temperature are rapidly exceeded. Preferably, in the case where a corresponding outdoor sensor is provided and available, the value of the outdoor sensor may be compared with the corresponding indoor value, and if the indoor parameter is greater than the outdoor parameter, it is indicated that a fire may exist in the room, otherwise the presence of the fire cannot be determined, and then the initial continuous monitoring of the contaminants is returned. This arrangement is advantageous, for example, in situations where the source of the pollution is located outdoors, where contaminants from, for example, road construction, finishing, incineration, etc. may enter the room through the fresh air system, where false positives of indoor fires may be avoided by determining that the indoor contaminant concentration is less than the outdoor contaminant concentration (and/or that the indoor temperature is less than the outdoor temperature).
In one embodiment, when an alarm is performed, the concentration value of the pollutant triggering the alarm at the moment may be recorded and the latest several concentration values of the pollutant may be recorded periodically, and if the difference obtained by subtracting the average value of the latest several concentration values of the pollutant from the concentration value of the pollutant recorded when the alarm event occurs is smaller than the confirmation threshold value of the pollutant for a certain time or the difference continuously decreases for a certain time (which may be determined by the above-mentioned method of determining the dispersion of data), the alarm may be released. For example, after triggering the intrusion alarm, the indoor carbon dioxide concentration value at the moment can be recorded, and the indoor carbon dioxide concentration value is periodically recorded, if the difference between the indoor carbon dioxide concentration value at the time of the intrusion alarm and the average value of the latest carbon dioxide sampling concentration values measured indoors later is smaller than a certain confirmation margin for a certain time or the difference continuously decreases for a certain time, the indoor carbon dioxide concentration value is steadily decreased, that is, the indoor intrusion is relieved, and the intrusion alarm can be relieved at the moment. After the occurrence of the fire alarm, it is similarly determined whether the fire alarm should be released.
Further, the alarm may be disarmed by confirming that the difference of the indoor contaminant concentration value minus the outdoor contaminant concentration value is less than the confirmation threshold for that contaminant for a certain time or that the difference continues to decrease for a certain time, if a corresponding outdoor sensor is configured and available. The alarms described herein include one or more of the following: and pushing corresponding alarm information to a home intelligent terminal or a user mobile phone and the like, starting a sound/light alarm, starting fire emergency equipment (such as spraying equipment) and the like.
All the sensors can be flexibly installed by a user in a matching mode, and corresponding parameters can be configured through a mobile phone APP or a home intelligent terminal or in any other mode, various threshold values described in the text can be configured, and the sensors can be respectively started or stopped, and an intrusion monitoring function and a fire alarm function can be started or stopped to achieve corresponding functions and any functions which can be achieved through the configuration described in the text.
It should be noted that, in the foregoing description of the embodiments of the apparatus, the described logic, steps, flows, etc. are also applicable to the method embodiments of the present invention.
According to the disclosure, the invention provides a security monitoring method and device based on a fresh air machine. In the embodiment of the invention, the traditional fresh air fan is combined with various sensors, so that whether an indoor abnormal condition occurs or not can be reliably judged by effectively monitoring indoor pollutants while the fresh air fan operates, and then an alarm or further processing is carried out.
Various embodiments are described in a progressive manner, with each embodiment focusing on differences from the prior art or other embodiments, and for the sake of brevity, the same or similar parts between various embodiments are not described in every embodiment, and such details between various embodiments may be mutually referenced. Any combination of the above embodiments is possible, and thus any combination between the above embodiments is an embodiment of the present invention, as will be readily apparent to those skilled in the art.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some embodiments, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects may lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any one or more of the claimed embodiments can be used in any combination.
Various apparatus embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functionality of some or all of the components in accordance with embodiments of the present invention. The present invention can also be embodied as an apparatus or program code (e.g., a computer program product) for performing a portion or all of the methods described herein. Such program code implementing the present invention may be stored on a computer readable medium or may be in any form readable by a computer.
For example, FIG. 5 illustrates a computing device for performing a security monitoring method in accordance with the present invention. The computing device generally includes a processor 510 and a computer program product or readable medium in the form of a memory 520. The memory 520 may be electronic memory such as flash memory, EEPROM, EPROM, or ROM. The memory 520 has storage space 530 for program code 531 for performing any of the method steps of the methods described herein. For example, the storage space 530 for the program code may include respective program codes 531 for implementing various steps in the above method, respectively. The program code may be read from or written to one or more program products. These program code may, for example, exist in any suitable form (such as executable code, binary code, etc.) and may be compressed in a suitable form. The program code, when executed by a computing device, causes the computing device to perform the steps of the method described above.
While preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts of the present application. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the application.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Claims (12)

1. A security monitoring method based on a fresh air machine comprises the following steps:
a. monitoring the concentration of one or more indoor gaseous pollutants in real time;
b. if the monitored contaminant concentration is less than the contaminant concentration threshold ThcReaches a time threshold Th for the contaminanttIf not, returning to the step a;
c. if the degree of dispersion D monitored during a certain time t remains at the threshold degree of dispersion ThDIf the average value A is increased, the event triggering condition corresponding to the gas pollutant is met, and corresponding alarm is given to the event triggering condition。
2. The method of claim 1, further comprising, after step a and before step c, the steps of: monitoring the outdoor concentration of the gaseous pollutant, and returning to the step a if the outdoor concentration is greater than or equal to the indoor concentration of the pollutant.
3. The method of claim 1 or 2, wherein the gaseous contaminant comprises carbon dioxide and the alarm is an intrusion alarm.
4. The method of claim 1 or 2, wherein the gaseous pollutants comprise carbon dioxide and one or more of PM2.5, PM10, a TVOC sensor, and a temperature sensor, and the alarm is a fire alarm.
5. The method of claim 1 or 2, wherein the degree of dispersion is measured by one or more of the following indicators: least squares fit slope, variance, standard deviation, range, mean, and interquartile range.
6. Method according to claim 1, wherein, at the time of the respective alarm, the concentration value of the pollutant triggering the alarm at that moment is recorded and the periodic recording of the latest number of concentration values of this pollutant is started, the alarm being released if the difference, obtained by subtracting the average value of the latest number of concentration values of this pollutant from the concentration value of this pollutant recorded at the time of the alarm event, is smaller than the confirmation threshold value of this pollutant for a certain time or the difference continues to decrease for a certain time.
7. The method of claim 2, wherein after a respective alarm is made, periodically recording an indoor contaminant concentration value and a corresponding outdoor contaminant concentration value that triggered the alarm, the alarm being disarmed if the difference of the indoor contaminant concentration value minus the outdoor contaminant concentration value is less than a confirmation threshold for that contaminant for a certain time or the difference continues to decrease for a certain time.
8. A method according to claim 3, wherein the threshold value Th of the degree of dispersion of carbon dioxideDCalculated by the following method:
ThD= S/V；
wherein S is the volume of carbon dioxide exhaled by an object to be monitored in unit time, and V is the volume of the working space of the fresh air fan.
9. A method according to claim 8, wherein for the case where the new fan workspace volume V is unknown, a certain contaminant value P at a certain time after the device is turned on is recorded, and a second time after a certain time t of device operation is recorded, where V can be estimated by:
V = k×P×F×t/(P-C)；
wherein k is the efficiency coefficient (0 < k < 1) of the local circulation of the fresh air and the return air caused by the fresh air machine, and F is the working air volume of the equipment.
10. The method of claim 4, wherein the temperature at the return air inlet of the fresh air machine is monitored for a monitoring time after the fire alarm is initiated, and if the difference between the temperature at the return air inlet minus the temperature at the air inlet continues to increase for the monitoring time, the fresh air machine is turned off and a fire log is recorded, otherwise the fire alarm is deactivated after the monitoring time.
11. The method of claim 1 or 2, wherein the alert comprises one or more of: pushing corresponding alarm information, starting a sound alarm and starting emergency equipment.
12. A fresh air machine-based security monitoring apparatus comprising one or more of a carbon dioxide sensor, a PM2.5 sensor, a PM10 sensor, a TVOC sensor, and a temperature sensor, the security monitoring apparatus further comprising a computing device comprising a processor and a memory, the memory having stored thereon computer-executable code configured to, when executed on the processor, cause the computing device to perform the method of any of claims 1-11.
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