WO2020078163A1

WO2020078163A1 - Method and apparatus for detecting change of environment of passage

Info

Publication number: WO2020078163A1
Application number: PCT/CN2019/107000
Authority: WO
Inventors: 徐承柬; 李志新; 龚大国; 陈骋; 黄振川; 朱能辉
Original assignee: 浙江天地人科技有限公司
Priority date: 2018-10-15
Filing date: 2019-09-20
Publication date: 2020-04-23
Also published as: CN109655835A

Abstract

Provided is a method for detecting a change of an environment of a passage, comprising the following steps: obtaining ultrasonic data detected in a preset background environment, the ultrasonic data comprising an echo time and an echo intensity value (S101); determining control data according to the ultrasonic data in the preset background environment (S104); obtaining ultrasonic data detected in the current environment (S105); determining target data according to the ultrasonic data in the current environment (S108); comparing the target data with the control data (S109); and determining whether a change difference of the target data with respect to the control data meets a preset condition, and if yes, determining that the current environment changes with respect to the preset background environment and sending an alarm signal (S111). The method can be used for monitoring an environment of a fire passage to recognize a change state of a background object in the environment, determine whether there is an obstacle in the fire passage or whether a normally closed fire-proof door is open, and if it is detected that there is an obstacle in the fire passage or a normally closed fire-proof door is open, send an alarm signal, thereby effectively avoiding the occurrence of the case where the fire passage is occupied or the normally-closed fire-proof door is not normally used.

Description

Method and device for detecting channel environment change

Technical field

The invention relates to the field of fire safety, in particular to a method and device for detecting the change of the channel environment.

Background technique

Fire safety passages have important meanings and functions in modern buildings, and are often hailed as life passages. When fires or other dangerous situations require emergency evacuation of people, the smooth passage of fire passages is to quickly extinguish fires, rescue people's lives and property, and reduce fire losses The important premise is that if the fire control channel is occupied, it will bring significant hidden dangers to the life and property of the community owners.

Article 28 of China's "New Fire Fighting Law" stipulates that no unit or individual shall occupy, block or close evacuation passages, safety exits or fire truck passages. Doors and windows in crowded places shall not be provided with obstacles affecting escape and fire fighting and rescue. If there is a violation of these regulations, the unit shall be ordered to make corrections according to Article 60 of the New Fire Fighting Law, and shall be fined more than 5,000 yuan but not more than 50,000 yuan. Individuals who violate these regulations shall be warned or fined less than 500 yuan. Although there are legal provisions, there are actually situations where fire escapes are occupied, especially in corridors and shops. Some people always store items in the fire exits, which narrows the width of the fire exits and affects the escape and fire rescue.

The efficiency of the existing fire-fighting channel inspection is very low, often relying only on manual inspection, supplemented by the relevant person in charge of publicity and education, which is time-consuming and laborious. However, even after thousands of instructions, after a long period of time, the vigilance of the relevant personnel will still be occupied The fire escape happened.

In addition to the items occupying the fire exit, there are also cases where the normally closed fire door of the fire exit is opened artificially for easy walking. In modern fire protection design, the function of the normally closed fire door is to close the fire door when a fire occurs It can effectively delay the spread of fire and smoke from the fire floor to the stairwell, fire exit or other floors, and gain time for personnel evacuation.

Summary of the invention

To avoid the deficiencies of the background art, the present invention provides a method for detecting the change of the environment of the passage, which can detect the change of the environment in the fire passage and send an alarm signal when an obstacle is recognized or the normally closed fire door is opened.

The detection method of the channel environment change proposed by the present invention includes the following steps:

Obtain the ultrasonic data detected in the preset background environment, the ultrasonic data includes the echo time and the echo intensity value corresponding to the echo time;

Determine the control data according to the ultrasound data in the preset background environment;

Obtain the ultrasonic data detected in the current environment;

Determine the target data according to the ultrasonic data in the current environment;

Compare the target data with the control data;

Determine whether the difference between the target data and the comparison data meets the preset condition, and if so, determine whether the current environment has changed compared to the preset background environment.

Further, before the step of determining the comparison data according to the ultrasonic data in the preset background environment, the method further includes the steps of: acquiring the detected ambient temperature in the preset background environment; determining the preset background environment and the response in accordance with the relationship between the ambient temperature and the speed of sound temperature The reflection distance corresponding to the wave time; before the step of determining the target data according to the ultrasonic data in the current environment, it also includes the steps of: acquiring the detected ambient temperature in the current environment; determining the current environment and the echo time according to the relationship between the ambient temperature and the speed of sound temperature Corresponding reflection distance; the comparison data and the target data include the reflection distance and the echo intensity value corresponding to the reflection distance.

Further, the control data and the target data are determined by averaging after filtering multiple ultrasonic data under their corresponding environments.

Preferably, the step of judging whether the change difference between the target data and the control data satisfies the preset condition includes: determining each peak value of the echo intensity value appearing in the control data and the echo time or reflection distance corresponding to the peak value; determining the target data Each peak of the echo intensity value and the echo time or reflection distance corresponding to the peak; determine whether there is an echo time or reflection distance corresponding to the peak of the echo intensity value in the target data or control data. Echo time or reflection distance.

Further, if it is determined that there is an echo time or reflection distance corresponding to the peak value of the echo intensity in the target data, and the equivalent echo time or reflection distance cannot be found in the comparison data, it is determined that the current environment has an obstacle compared to the preset background environment If the echo time or reflection distance corresponding to the peak of the echo intensity value is found in the control data and the equivalent echo time or reflection distance cannot be found in the target data, then it is determined that the current environment is more frequent than the preset background environment. The closed fire door is open.

Preferably, the step of judging whether the change difference between the target data and the control data satisfies the preset condition includes: determining the ratio of the target data echo intensity value and the control data echo intensity value at the same echo time or reflection distance; A ratio exceeds the preset value.

Further, if it is determined that a ratio exceeds the first preset value, it is determined that the current environment has an obstacle compared to the preset background environment; if it is determined that the ratio is lower than the second preset value, it is determined that the current environment is compared to the preset background environment There are cases where normally closed fire doors are open.

Further, before the step of acquiring the ultrasonic data detected in the current environment, the method further includes the steps of: judging whether the set detection time point is reached, and if so, proceeding to the step to acquire the ultrasonic data detected in the current environment.

Further, before the step of acquiring the ultrasonic data detected in the current environment, the method further includes the steps of:

Determine whether there is infrared sensor of human body, if yes, go to the next step;

Determine whether the disappearance from the infrared sensor reaches the first preset time interval, if yes, go to the next step;

It is determined whether the second preset time interval has been reached since the last detection, and if so, the step is entered to obtain ultrasonic data detected in the current environment.

The present invention also proposes a channel environment change detection device, which includes a memory for storing a program and a processor for executing the program. When the program is executed by the processor, any channel environment change as described above is implemented The steps of the detection method.

The beneficial effect of the present invention is that the method of the present invention can be applied to the environmental monitoring of the fire protection channel, identify the background changes in the environment, determine whether there is an obstacle in the fire protection channel or the normally closed fire door is open, and send an alarm signal when detected In order to effectively avoid the situation that the fire control channel is occupied or the normally closed fire door is not used normally, when the accident occurs, the evacuation and escape of the masses and the rescue of firefighters can be successfully guaranteed.

BRIEF DESCRIPTION

FIG. 1 is a schematic flowchart of Embodiment 1.

2 is a waveform diagram of ultrasonic data in a preset background environment of a scene in Embodiment 1.

3 is a waveform diagram of ultrasonic data of a current environment of a scene in Embodiment 1. FIG.

4 is a schematic flowchart of Embodiment 2.

detailed description

The present invention will be further described below with reference to the drawings and specific embodiments.

Embodiment 1, referring to FIGS. 1-3, a method for detecting a channel environment change includes the following steps:

S101: Acquire ultrasonic data detected under a preset background environment, the ultrasonic data includes an echo time and an echo intensity value corresponding to the echo time;

The traditional ultrasonic distance measuring device can only detect the presence of reflected ultrasonic waves, that is, reflected echoes after transmitting ultrasonic waves. Based on this principle, when the ultrasonic transmitter emits ultrasonic waves in a certain direction, it starts timing at the same time as the transmission time. The ultrasonic waves are in the air Propagation. When an obstacle is encountered on the way, it will return immediately. When the ultrasonic receiver receives the reflected echo, it will stop timing immediately to obtain the echo time. According to the formulas of sound speed and echo time, the distance between the ultrasonic ranging device and the nearest object can be calculated. distance. On the basis of the above, the ultrasonic device used in the present invention can also detect the intensity value of the reflected ultrasonic wave, that is, the echo intensity value. When the ultrasonic transmitter transmits ultrasonic waves to an object, the ultrasonic receiver receives the reflected echo Obtain the echo intensity value and echo time without stopping the timing; because the ultrasonic wave has a large beam angle, there may be many reflection points on the surface of the object within the beam angle that can reflect the ultrasonic wave, and the distance between the reflection point and the ultrasonic device is greatly different. It is small, so as the echo time increases, the ultrasonic device can continuously detect the echo intensity value corresponding to the echo time. The magnitude of the echo intensity depends on the total number of reflection points at the same reflection distance (or the same echo time).

For ease of understanding, taking FIG. 2 as an example, the obtained echo time (or reflection distance) is taken as the horizontal axis, and the echo intensity value is taken as the vertical axis to form a visual and intuitive waveform diagram. When an ultrasonic device emits ultrasonic waves to an object existing in the preset background environment, due to factors such as object angle, shape and size, echoes are likely to form in certain areas, such as the ground, wall corners, and the right angle between the door and the ground directly below the device And so on, so that the peak of the echo intensity value appears at the echo time corresponding to the area in the waveform diagram. Some areas do not or rarely form echoes, so that the echo intensity value at the echo time corresponding to the area in the waveform graph tends to zero. The preset background environment is stable, so the trend of the waveform after the ultrasonic data acquisition is basically the same, but because of the characteristics of the ultrasonic wave, the echo intensity value corresponding to the echo time in the data collected multiple times will fluctuate up and down , But this fluctuation can be counted within the error. The preset background environment is generally a normal environment that can remain intact for a long time, that is, a scene in which no people or animals are in the passage, no obstacles on the ground are not fixed objects, and a normally closed fire door is closed.

S102: Obtain the detected ambient temperature under a preset background environment; the speed of sound traveling in the air at different temperatures is different, and the temperature difference between winter and summer may differ by thirty to forty degrees, even if the background environment remains the same and the detected echo time There will be slight changes due to temperature changes, so that although the overall trend of ultrasound waveforms is roughly the same, there will be larger or smaller overall scaling on the echo time axis with temperature changes.

S103: Determine the reflection distance corresponding to the echo time under the preset background environment according to the relationship between the ambient temperature and the speed of sound temperature; the echo time will change as the ambient temperature changes, but the reflection distance will be changed when no one changes the preset background environment The following will not change, so when comparing the echo intensity data, it is more accurate to use the reflection distance as the reference than the echo time as the reference.

S104: Determine the comparison data according to the ultrasound data in the preset background environment, the comparison data includes the reflection distance and the echo intensity value corresponding to the reflection distance; according to the above step, the echo time and the ultrasound data with the echo intensity value can be converted The comparison data of the reflection distance and the echo intensity value is the data used for reference. Since the echo intensity value will fluctuate up and down, the comparison data is generally determined by averaging after filtering multiple ultrasonic data.

S105: Acquire the ultrasonic data detected in the current environment; this step is substantially the same as step S101.

S106: Obtain the detected ambient temperature in the current environment; this step is approximately the same as step S102.

S107: Determine the reflection distance corresponding to the echo time in the current environment according to the environmental temperature and sound velocity temperature relationship; this step is approximately the same as step S103.

S108: Determine target data according to the ultrasonic data in the current environment. The target data includes a reflection distance and an echo intensity value corresponding to the reflection distance; this step is approximately the same as step S104.

S109: Compare the target data with the control data.

S110: Determine whether the difference between the target data and the comparison data meets the preset conditions, and if so, go to the next step; this embodiment introduces two algorithms, the first algorithm through the following steps:

Determine the peak values of the echo intensity values appearing in the comparison data and the reflection distance corresponding to the peak values;

Determine each peak value of the echo intensity value appearing in the target data and the reflection distance corresponding to the peak value;

Judging whether there is a reflection distance corresponding to the peak value of the echo intensity value in the target data or the comparison data, the equivalent reflection distance cannot be found in another set of data.

In theory, if the channel environment does not change, then the waveform of the target data should have the same trend as the waveform of the control data, that is, the same peak at the same reflection distance. Conversely, if the channel environment changes, either new peaks will appear or the original peaks will disappear. This algorithm determines whether the environment has changed by comparing the degree of reflection distance corresponding to the peak value of the echo intensity value in the target data and the control data.

It should be known that since the ambient temperature is detected in this embodiment, the horizontal axis of the comparison data and the target data is a more accurate and uniform reflection distance. If the ambient temperature is not detected, then the horizontal axis is the echo time, and the final detection The approximate trend of the target data waveform graph is the same as the control data waveform graph (based on the preset background environment), but the target data waveform graph will appear larger or smaller on the horizontal axis than the control data waveform graph. The size of the scaling is related to the temperature difference between the current ambient temperature and the ambient temperature when the comparison data is determined. Generally speaking, if the detection of the ambient temperature is omitted in the method of this embodiment, the calculation complexity of the final judgment will increase.

The second algorithm goes through the following steps:

Determine the ratio of the echo intensity value of the target data to the echo intensity value of the control data at the same reflection distance;

Determine if any ratio exceeds the preset value.

The algorithm is similar to the first algorithm, but the performance is different. The algorithm uses the ratio of the echo intensity value of the target data and the control data to determine whether the environment has changed. The fluctuation of the echo intensity value has little effect on the ratio , The ratio will be around 1, but if there is a new peak or the original peak disappears, then the ratio will change drastically, with a situation that is much greater than 1 or much less than 1.

S111: It is determined that the current environment has changed from the preset background environment.

According to the first algorithm in step S110, if it is determined that there is a reflection distance corresponding to the peak value of the echo intensity value in the target data and the reflection distance corresponding to the peak value of the equivalent echo intensity value cannot be found in the comparison data, it is determined that the current environment is Set an obstacle in the background environment and send an alarm signal; if it is judged that there is a reflection distance corresponding to the peak value of the echo intensity value in the control data and the equivalent reflection distance corresponding to the peak value of the echo intensity value cannot be found in the target data, the current environmental phase is determined Compared with the preset background environment, there is a situation that the normally closed fire door is opened and an alarm signal is sent.

According to the second algorithm in step S110, if it is determined that the ratio exceeds the first preset value, it is determined that the current environment has an obstacle compared to the preset background environment; if it is determined that the ratio is lower than the second preset value, the current environment is determined Compared with the preset background environment, there is a case where the normally closed fire door is opened.

To intuitively embody the principle of the method of this embodiment, the applicant takes the test results under a certain scenario as an explanation. 2 and 3, FIG. 2 is a waveform diagram of ultrasonic data under a certain preset background environment, which can be regarded as an empty background environment; FIG. 3 is that some objects are placed in the environment; from FIG. 2, the apparent peak There are 3, and there are 6 obvious peaks in Figure 3. It can be clearly seen after comparison that there are three peaks in Figure 3 that can be found in Figure 2 corresponding to the horizontal axis value, and the other three peaks are newly added. The three new peaks are because of the placed object Caused.

The method of this embodiment can be applied to the environmental monitoring of the fire channel, identify the changes in the background of the environment, determine whether there are obstacles in the fire channel or the normally closed fire door is open, and send an alarm signal when detected to effectively avoid fire The channel is occupied or the normally closed fire door is not used normally. When an accident occurs, the evacuation and escape of the masses and the rescue of firefighters can be successfully guaranteed.

Embodiment 2, referring to FIG. 4, a method for detecting a channel environment change, which is applied to a dedicated channel environment change detection device, includes the following steps:

S201 Obtain ultrasonic data detected under a preset background environment;

S202: Determine the comparison data according to the ultrasound data in the preset background environment;

In S203, it is judged whether the infrared sensor of the human body occurs, and if it is, the next step is performed; in this embodiment, the detected triggers are classified into two types, one is a passive trigger, and the other is an active trigger, and this step is a passive trigger. The background environment changes, so the probability is caused by human reasons. If the detection device does not sense the human body infrared, the default environment will not change. If the human body infrared is sensed, the background environment may change and need to be detected .

S204 determines whether the current time is no longer the first preset time interval from infrared sensor disappearance, and if so, the next step is performed; the ultrasonic detection needs to be performed without a person, otherwise, the presence of personnel will definitely interfere with the detection results, resulting in false alarms . In this step, after the infrared sensor disappears, the detection starts after the first preset time interval. The purpose is to avoid the incontinence of multiple people in a short time, the ultrasonic device may appear that the previous person has just left, after the detection is completed, the next person The situation that came in again caused the detection of the ultrasonic device to be meaningless, so it was determined that no one had passed by in a short time before starting the detection. The first preset time interval in this embodiment is preferably 1-5 minutes.

S205 determines whether the current time has reached the second preset time interval from the last detection, and if so, proceeds to the next step; if personnel enter and exit very frequently, the ultrasonic device will also be detected frequently, if the ultrasonic device is powered by power, then it is nothing Problem, if it is battery-powered, frequent testing will inevitably consume a lot of power and reduce product life; therefore, in this step, on the basis of the previous step, the time interval between the ultrasonic device and the last test is judged again to Reduce the overall detection frequency. In this embodiment, the second preset time interval is preferably 1-2 hours.

S206 determines whether the current time reaches the preset detection time point, and if it is, it proceeds to the next step; this step is an active trigger. Generally, the preset detection time point can be set in the middle of the night and detected once a day. Scenarios, routine testing once a day is enough to meet demand.

S207 Acquire the ultrasonic data detected in the current environment;

S208 determines target data according to the ultrasonic data in the current environment;

S209 compares the target data with the control data;

S210 determines whether the change difference between the target data and the comparison data meets the preset conditions, and if so, proceeds to the next step; otherwise, returns to step S203 and step S206, and continues to wait for the next detection trigger;

S211 determines that the current environment has changed from the preset background environment and sends an alarm signal.

In this embodiment, reference can be made to Embodiment 1 for the acquisition, calculation, and judgment of ultrasonic data.

The method of this embodiment can be applied to a detection device for changes in the channel environment. When the infrared response of the human body is detected, the channel environment is not detected, but the channel environment detection is performed after the infrared response of the human body disappears, to ensure that the person will not be placed in the channel after passing Items, so that the channel environment can be kept in a smooth state.

Although the present invention has been described with reference to the preferred embodiments, persons of ordinary skill in the art should understand that it may not be limited to the description of the above embodiments, and various forms and details may be made within the scope of the claims Variety.

Claims

A method for detecting channel environment changes, which is characterized by the following steps:

Acquiring ultrasonic data detected under a preset background environment, the ultrasonic data including an echo time and an echo intensity value corresponding to the echo time;

Determine the control data according to the ultrasound data in the preset background environment;

Obtain the ultrasonic data detected in the current environment;

Determine the target data according to the ultrasonic data in the current environment;

Compare the target data with the control data;

Determine whether the difference between the target data and the comparison data meets the preset condition, and if so, determine whether the current environment has changed compared to the preset background environment.
The method for detecting the change of the channel environment according to claim 1, wherein before the step of determining the comparison data according to the ultrasound data in the preset background environment, the method further comprises the step of:

Obtain the detected ambient temperature under a preset background environment;

Determine the reflection distance corresponding to the echo time under the preset background environment according to the environmental temperature and sound velocity temperature relationship;

Before the step of determining target data according to the ultrasonic data in the current environment, the method further includes the steps of:

Obtain the detected ambient temperature in the current environment;

Determine the reflection distance corresponding to the echo time in the current environment according to the relationship between ambient temperature and sound velocity temperature;

The comparison data and the target data include a reflection distance and an echo intensity value corresponding to the reflection distance.
The method for detecting a change in channel environment according to claim 1, wherein the control data and the target data are determined by averaging after filtering multiple times of ultrasonic data in their respective environments.
A method for detecting a change in channel environment according to any one of claims 1-2, wherein the step of determining whether the difference between the change in target data and the comparison data satisfies a preset condition includes:

Determine the peaks of the echo intensity values appearing in the comparison data and the echo time or reflection distance corresponding to the peaks;

Determine each peak value of the echo intensity value appearing in the target data and the echo time or reflection distance corresponding to the peak value;

To determine whether there is an echo time or reflection distance corresponding to the peak value of the echo intensity in the target data or the comparison data, it is impossible to find the equivalent echo time or reflection distance in another set of data.
A detection method of channel environment change according to claim 4, wherein if it is determined that there is an echo time or a reflection distance corresponding to the peak value of the echo intensity value in the target data, the equivalent echo time or the echo time cannot be found in the comparison data Reflection distance, it is determined that there is an obstacle in the current environment compared to the preset background environment; if there is an echo time or reflection distance corresponding to the peak value of the echo intensity value in the comparison data, it is impossible to find the equivalent echo time or the echo distance The reflection distance determines that the current environment has a normally closed fire door open compared to the preset background environment.
A method for detecting a change in channel environment according to any one of claims 1-2, wherein the step of determining whether the difference between the change in target data and the comparison data satisfies a preset condition includes:

Determine the ratio of the echo intensity value of the target data to the echo intensity value of the control data at the same echo time or reflection distance;

Determine if any ratio exceeds the preset value.
A method for detecting channel environment changes according to claim 6, wherein if it is determined that a ratio exceeds the first preset value, it is determined that there is an obstacle in the current environment compared to the preset background environment; if it is determined that the ratio is lower than the first Two preset values, it is determined that the current environment has a normally closed fire door open compared to the preset background environment.
The method for detecting the change of the channel environment according to claim 1, wherein before the step of acquiring the ultrasonic data detected in the current environment, the method further comprises the step of determining whether the set detection time point is reached, and if so, proceeding to the step of acquiring Ultrasound data detected in the current environment.
The method for detecting the change of the channel environment according to claim 1, wherein before the step of acquiring ultrasonic data detected in the current environment, the method further comprises the step of:

Determine whether there is infrared sensor of human body, if yes, go to the next step;

Determine whether the disappearance from the infrared sensor reaches the first preset time interval, if yes, go to the next step;

It is determined whether the second preset time interval has been reached since the last detection, and if so, the step is entered to obtain ultrasonic data detected in the current environment.
A channel environment change detection device, including a memory for storing a program and a processor for executing the program, characterized in that: when the program is executed by the processor, any one of claims 1-9 is realized Method steps.