WO2019080341A1

WO2019080341A1 - Apparatus and method for automatically monitoring heat source in home kitchen

Info

Publication number: WO2019080341A1
Application number: PCT/CN2017/118295
Authority: WO
Inventors: 董兵; 沈晓春; 陈岗; 朱云鹏; 贾萍; 成超; 张晋勇; 司徒毅
Original assignee: 广东轻工职业技术学院
Priority date: 2017-10-24
Filing date: 2017-12-25
Publication date: 2019-05-02
Also published as: SG11202003631QA; CN107561992A; CN107561992B; WO2019080341A9

Abstract

An apparatus and method for automatically monitoring a heat source in a home kitchen. The apparatus comprises: a controller (7), and a stepping electric motor control circuit, an infrared detector (1), a stepping electric motor 0° position recognition circuit, a status indicator light (10), a button (9) and a voice circuit, which are connected to the controller (7), wherein the stepping electric motor control circuit is connected to a stepping electric motor (5); and the infrared detector (1) comprises a driving circuit, a dual-element pyroelectric infrared sensor (24), a filter amplifier, a gate screen execution mechanism, and a Fresnel lens (13). The method comprises: by means of data analysis of two states, i.e. human body monitoring and heat source scanning, automatically recognizing an enabled state of a fixed heat source when there is no person in a kitchen, automatically determining a voice playing period according to the radiation intensity of the fixed heat source, and automatically playing voice alarm information. A fixed heat source in a kitchen can be effectively monitored, and intelligent home control over automatically recognizing a situation in which there is a person in a room and a situation in which there is no person in a room can be achieved.

Description

Device and method for automatically monitoring heat source in home kitchen

Technical field

The invention relates to the field of heat source monitoring and reminding, and particularly relates to a device and a method for automatically monitoring a heat source in a domestic kitchen.

Background technique

As China's aging pace continues to accelerate, the safety risks caused by the use of fixed heat sources (gas stove fires, induction cookers, electric woks, etc.) by the elderly in the kitchen are also growing. As the memory of the elderly grows with age, it is often forgotten to turn off the fire (or the kitchen appliance switch), so that the food in the pan on the kitchen stove is heated for a long time, and the food is cooked, the induction cooker, the electric wok, the pot Burning occurs sometimes, especially when the gas fire burns for a long time without being inspected, and it may also bring danger to life and property such as fire. In the prior art, there is no fixed heat source monitoring and reminding device for the kitchen. For this reason, a smart home control device that can automatically identify the situation in the kitchen and whether there is a fixed heat source in the absence of the environment can effectively prevent the kitchen fire. Accidents and the dangers of life and property safety, and improving the quality of life safety are the research directions of those skilled in the art.

Summary of the invention

The main object of the present invention is to overcome the shortcomings and deficiencies of the prior art, and to provide an apparatus and method for automatically monitoring a heat source in a domestic kitchen, which has two states of human body monitoring and heat source scanning, and solves the problem that the existing infrared monitoring device cannot be static. The problem of automatic identification of the human body and fixed heat sources enables effective monitoring of the kitchen's fixed heat source for safe and intelligent home control in the kitchen.

To achieve the above object, the present invention adopts the following technical solutions:

The device for automatically monitoring the heat source in the kitchen of the invention comprises a controller and a stepping motor control circuit connected with the controller, an infrared detector, a stepping motor 0° position recognition circuit, a status indicator, a button and a voice circuit The stepping motor control circuit is connected with a stepping motor; the infrared detector is used for monitoring the moving human body and detecting the infrared radiation amount of all fixed heat sources in the kitchen, including the driving circuit and the dual element pyroelectric infrared sensor. a filter amplifier, a gate actuator, and a Fresnel lens, the filter amplifier being coupled to a controller, the dual pyroelectric infrared sensor being coupled to a filter amplifier, the Fresnel lens being disposed in a dual pyroelectric a front end of the infrared sensor, the driving circuit is connected to the controller, and the gate actuator is connected to the driving circuit; the driving circuit is used under the control of the controller to generate a forward and reverse DC current flowing through the DC electromagnet The gate actuator is used for automatic cutting of two states of human body monitoring and heat source scanning driven by a driving circuit The dual element pyroelectric infrared sensor is configured to identify a moving heat source; the Fresnel lens is used to concentrate the infrared light radiated by the target to the dual element pyroelectric infrared sensor located at the focus of the lens The dual pyroelectric infrared sensor is configured to identify a moving heat source, and the filter amplifier is configured to filter and amplify a weak pulse signal output by the dual pyroelectric infrared sensor.

As a preferred technical solution, the Fresnel lens concentrates the infrared rays radiated by the target through the concentric narrow band on the mirror surface to the binary pyroelectric infrared sensor located at the focus of the lens, and divides the sensing angle into intervals. The "bright area" and the "dark area", when the human body moves to the sensing angle, generate a continuous pulse of light that is radiated on the dual pyroelectric infrared sensor.

As a preferred technical solution, the grid actuator includes a DC electromagnet, a DC electromagnet holder, a permanent magnet, a limit baffle, a grid curtain, a grid stay, and three hinges, and the three hinges are coaxial columns. The DC electromagnet is disposed in the DC electromagnet holder; the permanent magnet is fixed at the root of the grid strut; the lower portion of the grid strut is used for installing the grating; the grating strut is made of non-ferrous Made of metal, the root of the grid struts fixes a circular permanent magnet through four screw fixing holes. The surface area of the circular permanent magnet is the same as the surface area of the DC electromagnet, and the other two screw fixing holes are used for the grid screen. The struts are fixedly connected to the second hinge, and the grating screen installed under the grating struts is made of black paper to reduce the weight of the screen.

As a preferred technical solution, the filter amplifier is of the type BIS0001; the stepper motor is driven by the driver ULN2003 to drive the 28BYJ48 type stepping motor; the voice circuit adopts the ISD1700 voice chip; and the controller adopts the STC15F2K60S2 single chip microcomputer.

As a preferred technical solution, the controller, the voice circuit, the stepping motor 0° position recognition circuit are disposed in the housing, and the status indicator and the button are disposed on the front panel of the housing; the infrared detector passes The stepper motor shaft is connected to the stepper motor in the housing.

As a preferred technical solution, the stepping motor 0° position recognition circuit is composed of an LED lamp on the center line of the infrared detector and a photoresistor in a 0° position gap on the middle line of the box body; The LED light is a 0° position light;

The button is disposed at a bottom end of the box body; the state indication is represented by three LED lights respectively: "heat source scanning", "human body monitoring", and "system self-checking" three working states.

As a preferred technical solution, a power supply for monitoring the reminder device is further provided, wherein the power source is implemented by the switching power supply module for generating a +5V and +12V power supply, and the +5V power supply is provided to the stepper motor control circuit of the controller in the box body. The stepping motor 0° position recognition circuit, status indicator, language circuit and stepper motor supply; +12V power supply to the infrared detector through the external signal power line.

The invention also provides a monitoring method for an apparatus and a method for automatically monitoring a heat source in a domestic kitchen, comprising the following steps:

S1, boot initialization; when no one enters the kitchen, and all fixed heat sources in the kitchen are turned off, press the power button of the device, the system first performs the measurement of the initial data;

S2, identifying that the moving human target enters the kitchen; after the initialization is completed, the system is transferred to the human body monitoring state; when someone enters the kitchen, the dual pyroelectric infrared sensor receives the pulse signal of the moving human body infrared radiation after filtering and amplifying After being sent to the controller for signal processing, it is determined that after moving the human body target in the sensing angle, the controller of the device issues a control command to the driving circuit in the infrared detector, and drives the DC electromagnet to generate the polarity of the permanent magnet on the grid strut. Different magnetic poles, the second grid screen is attracted to the position of the DC electromagnet holder, that is, it is closed, and the first grid screen remains open, so that the induction angle is halved; when the human target is monitored, the human body enters the kitchen. The device does not alarm the heat source, otherwise it returns to the human body monitoring state as the human body does not enter the kitchen;

S3, identifying that the moving human body is out of the kitchen; after confirming that the human body enters the kitchen, the controller of the device issues a control command to the driving circuit in the infrared detector, which is opposite to the process of the step S2, that is, the first grating to the DC electromagnet holder The position is closed, and the second grid remains open, so that the induction angle is halved; when the target is detected, it indicates that the moving body is out of the kitchen, otherwise it is treated as a person in the kitchen and returned to the human body monitoring state;

S4, identifying whether the fixed heat source is turned on in the unmanned state in the kitchen; first determining whether the kitchen is in an unmanned state in the human body monitoring state, and when detecting that the kitchen is in an unmanned state, starting to identify the open state of the fixed heat source in the kitchen;

S5, the degree of risk identification and automatic speech source alarm; fire when the inner angle of the fixed heat source is an induction fire, the amount of infrared radiation, the infrared data collected is large, the value is continuously detected N times a _i exceeds the set maximum When the value is set, the controller automatically speeds up the set time period of the voice circuit playback. When the set play time is reached, the controller controls the voice circuit to send out through the speaker that “the fire in your kitchen is open, the fire is large, you XX minutes has left the kitchen, use caution "; when the fire when the fire is small, a small amount of infrared radiation, infrared data collected is small is continuously detected N times the value of a _i exceeds the set minimum value, the controller automatically The voice circuit playback set time period is lengthened. When the set play time is reached, the controller controls the voice circuit to send out through the speaker. "Your kitchen has a fire that is on, the fire is a small fire, and you have left the kitchen for XX minutes. , please pay attention to safety "; when the fire is in the fire, the medium infrared radiation, infrared data collected intervening value, the value of N times a _i is continuously detected exceeds the set an intermediate value, the controller automatically The sound circuit playback setting period is moderate. When the set play time is reached, the controller controls the voice circuit to send out through the speaker. "Your kitchen has a fire, the fire is on fire, you have left the kitchen for XX minutes. ,Please be careful";

S6. Re-acquisition and update of initialization data; when step S4 determines that there is no one in the kitchen, and no fixed heat source is turned on, the uncertainty includes sunlight infrared radiation, day and night temperature difference due to current environmental uncertainty, And the opening and closing of the kitchen window, the initial comparison value will change, need to be re-measured, the method is the same as step S1, the initial comparison value V _{n of the} re-measured human monitoring state and the heat source scanning state are fixed at different angles of the heat source initial comparison value A _i Overwrite the original value, provide initialization data for the next identification, and proceed to the next step;

S7, fixed heat source and static human body angle storage; clear the timing of the alarm accumulation time, store the confirmed fixed heat source and static human body angle, and prepare for the next time the user uses the kitchen;

S8, self-test test; press the self-test button, at this time the "system self-test" light is on, the controller first enters the "human body monitoring" state, when the infrared receiver receives the mobile body signal and can recognize, corresponding to "human body monitoring" The light is on, otherwise the "human body monitoring" is shining, indicating that the state is faulty; the controller then enters the "heat source scanning", the DC electromagnetic attraction drives the grid curtain to close, the stepping motor performs the scanning motion, and when the infrared receiver receives the fixed When the heat source signal is capable of azimuth recognition, the corresponding "heat source scan" light is on, otherwise the "heat source scan" light is blinking.

As a preferred technical solution, in the step S1, the performing the measurement of the initialization data includes the following steps:

S11. Entering the human body monitoring state; the controller of the device first sends a control command to the driving circuit in the infrared detector, and the driving gate actuator generates a driving force, that is, the DC electromagnet generates the same magnetic pole as the permanent magnet on the grating strut. Pushing the two grids to the position of the limit baffle, so that the first grating and the second grating are both opened. At this time, the infrared detector is at the 0° position, and the device is in the human body monitoring state;

S12, collecting the initial comparison value V _{n of the} human body monitoring state; the controller then controls the stepping motor to have a step angle of 1° and a stepping pulse frequency of 18 Hz, and then return to the 0° position after stepping +5°, and simultaneously storing the infrared detector at The infrared data value V _n measured in this state is stored in the data memory of the controller as an initial comparison value for identifying no one in the kitchen and without any fixed heat source being turned on; the infrared data value V _{n is} the human body monitoring state Initial comparison value V _n ;

S13. Entering the heat source scanning state; the controller of the device sends a control command to the driving circuit in the infrared detector, and the driving gate actuator generates a suction force, that is, the DC electromagnet generates a polarity different from the permanent magnet on the grid stay. The magnetic poles are connected to the position of the DC electromagnet fixing frame, so that the first grating screen and the second grating screen are closed, and the infrared detector is in the 0° position, and the device is in the heat source scanning state;

S14. Collecting the heat source scanning state to fix the initial heat source initial comparison value A _{i at} each angle; the controller then controls the stepping motor to have a step angle of 1° and a stepping pulse frequency of 18 Hz, and then jump back to the 0° position after stepping +90°, and simultaneously Store the infrared data values A ₊₁ , ... A _{+ i} ... A ₊₈₉ , A _{+ 90} measured in the state of the infrared detector in this state in the data memory of the controller; similarly, scan from 0 ° to -90°, and store the infrared data values A _-1 , ... A - _i ... A - ₈₉ , A - ₉₀ measured by the infrared detector in this state every 1 ° in the data memory of the controller; the infrared data The value A _{i is} the fixed heat source initial comparison value A _i .

As a preferred technical solution, in step S4, the identifying whether the fixed heat source is turned on in the unmanned state in the kitchen includes the following steps:

S41. The device is recognized by the human body monitoring state and is transferred to the human body monitoring state. When the mobile body is monitored, according to someone in the kitchen, the process returns to step S3, otherwise the process proceeds to the next step;

S42. Acquisition and comparison of the current value v _n of the infrared radiation in the human body monitoring state sensing angle; the controller then controls the stepping motor to have a step angle of 1° and a stepping pulse frequency of 18 Hz, and then return to the 0° position after stepping +5°. And storing the infrared data value v _n measured by the infrared detector in this state, and compared with the initial comparison value V _n that is not in the kitchen that has been stored in the data memory, and without any fixed heat source being turned on, if v _n >V _n , indicating that there is no one in the kitchen, there is a fixed heat source to open, to enter the next identification, otherwise, it is determined that there is no one in the kitchen, and no fixed heat source is turned on, return to step S2;

S43. Enter the heat source data collection from 0° to +90° in the heat source scanning state; the controller then controls the stepping motor to have a step angle of 1° and a stepping pulse frequency of 18 Hz, and then jump back to the 0° position after stepping +90°. At the same time, the infrared data values a ₊₁ , ... a _{+ i} ... a ₊ ₈₉ , a _{+ 90} measured by the infrared detector in this state every 1 ° are stored in the data memory of the controller;

S44. Entering the human body monitoring state and staying at the T1 time, when monitoring the moving human body, according to someone in the kitchen, returning to step S3, otherwise proceeding to the next step;

S45, the heat source data is collected from 0° to -90° in the scanning state of the heat source; in the same step S43, the controller controls the stepping motor to have a step angle of 1° and a stepping pulse frequency of 18 Hz, and then skips after stepping -90°. Returning to the 0° position, and storing the infrared data values a _-1 , ... a _-i ... a _-89 , a - ₉₀ measured by the infrared detector every 1 ° in this state in the data memory of the controller;

S46. Entering the human body monitoring state and staying for T2 time, when monitoring the moving human body, according to someone in the kitchen, returning to step S3, otherwise proceeding to the next step;

S47. Comparison of infrared radiation data of fixed heat sources at various angles; comparing the infrared data value a _i of the heat source measured at each angle with the initial comparison value A _{i of the} fixed heat source, if a _i >A _i , indicating that there is a fixed heat source at the angle i, otherwise there is no The heat source returns to step S4 to measure a _i cyclically, and compares the data of each group a _i with the upper group. The rising value indicates that the temperature of the heat source rises, otherwise the temperature of the heat source decreases; the value is large, indicating that the temperature of the heat source is high, and the detection is continuous N times. When the angle value is higher than the set value, the angle is stored, and proceeds to the next step; otherwise, when all the angle data is lower than the set value, it is determined that there is no one in the kitchen, and no fixed heat source is turned on, and the process proceeds to step S6;

S48, identifying a static human body in the kitchen; continuously detecting N times a _i and the upper group for numerical comparison, when the a _i value is abrupt, the mutation is less than or equal to A _i and remains unchanged, indicating that there is a static human body at the angle i, When the human body leaves, the infrared radiation data is abruptly changed and reduced, and it is treated by someone in the kitchen; otherwise, it enters the next step.

The present invention has the following advantages and effects over the prior art:

1. The invention analyzes data of two states of human body monitoring and heat source scanning, and automatically recognizes whether some people use various heat sources in the kitchen. When the human body leaves the kitchen and the heat source is not turned off, the voice playing period can be automatically determined according to the radiation intensity of the fixed heat source. And automatically play voice alarm information.

2. The invention controls the opening and closing of the grid screen by the controller, realizes the automatic switching between the human body monitoring and the heat source scanning state, and solves the problem that the existing infrared monitoring device cannot automatically identify the static human body and the fixed heat source.

3. The invention collects and processes the radiation values of the infrared detectors under the condition of the heat source scanning state, and realizes the automatic identification of the fixed heat source orientation and the radiation intensity.

4. The invention is also suitable for intelligently recognizing the human body characteristics of sitting or moving indoors, and can perform angular positioning on the static human body in the room, thereby realizing automatic identification of the situation of the person in the room and the intelligent home control under the condition of no one.

DRAWINGS

1 is a schematic view showing the circuit composition of a device for automatically monitoring a heat source in a home kitchen according to the present invention;

Figure 2 is a side view showing the structure of the apparatus for automatically monitoring the heat source in the home kitchen of the present invention;

Figure 3 is a front elevational view showing the structure of the apparatus for automatically monitoring the heat source in the home kitchen of the present invention;

4 is a schematic structural view of an infrared detector grid actuator according to the present invention;

Figure 5 is a schematic exploded view of the infrared detector grid actuator of the present invention;

6 is a schematic view showing the operation of the infrared source of the infrared detector of the present invention;

7 is a schematic view showing the working state of the human body of the infrared detector of the present invention;

8 is a schematic view showing the operation of the human body monitoring state of the infrared detector of the present invention to recognize the moving human body entering mode;

9 is a schematic view showing the operation of the human body monitoring state of the infrared detector of the present invention to recognize the human body exit mode;

Figure 10 is a flow chart of the software program of the present invention.

The figures indicate: 1, infrared detector; 2, box body; 3, stepper motor shaft; 4, external signal power line; 5, stepper motor; 6, circuit board; 7, controller; 8, external speaker Interface; 9, button; 10, status indication; 11, 0 ° position gap; 12, 0 ° position lamp; 13, Fresnel lens; 14, induction angle; 15, DC electromagnet; 16, DC electromagnet holder; , first hinge; 18, second hinge; 19, third hinge; 20, limit baffle; 21, grid struts; 22, permanent magnet; 23, grating; 24, dual pyroelectric infrared sensor 25, the first grating; 26, the second grating; 27, the gate gap.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Example:

As shown in FIG. 1, a circuit component of a device for automatically monitoring a heat source in a home kitchen includes a controller and a stepping motor control circuit connected to the controller, an infrared detector 1, a stepping motor 0° position recognition circuit, and a state An indicator light, a button and a voice circuit; the stepping motor control circuit is connected to the stepping motor; the infrared detector is used for monitoring the moving human body and detecting the infrared radiation amount of all fixed heat sources in the kitchen, including the driving circuit and the double a pyroelectric infrared sensor, a filter amplifier, a grating actuator, and a Fresnel lens 13. The filter amplifier is connected to a controller, and the dual pyroelectric infrared sensor is connected to a filter amplifier, the Fresnel lens A front end of the dual pyroelectric infrared sensor is disposed, and the driving circuit is connected to the controller, and the gate actuator is connected to the driving circuit.

As shown in FIG. 2 and FIG. 3, the device structure diagram for automatically monitoring the heat source in the home kitchen includes an infrared detector 1 and a casing 2, and the infrared detector 1 and the casing 2 are connected by a stepping motor shaft 3, and the infrared detection is performed. The power supply and the detected infrared radiation signal are connected to the circuit in the casing through the external signal power cable 4; the casing includes a stepping motor 5, a circuit board 6 and a controller 7, and the bottom of the casing is provided with an external connection The speaker interface 8 is provided with a button 9, a state indication 10 and a 0° position slit 11 at the lower part of the front surface of the box. The button 9 is a self-test and a switch button from left to right. The indication 10 is "human body monitoring", "heat source scanning" and "system self-test" from left to right; the front side of the infrared detector is provided with a 0° position lamp 12.

The infrared detector is used to complete the monitoring of the moving human body and the detection of the amount of infrared radiation of all fixed heat sources in the kitchen.

The Fresnel lens concentrates the infrared light radiated by the target through a special concentric narrow band on the mirror surface to the binary pyroelectric infrared sensor located at the focus of the lens, and divides the sensing angle into spaced "bright areas". And the "dark zone", when the human body moves to the sensing angle, the resulting continuous light pulse is radiated on the dual pyroelectric infrared sensor.

The dual pyroelectric infrared sensor is used to identify a moving heat source. When there is no human body and heat source radiating infrared signals in the kitchen, the incident infrared rays have no output in the binary sensor. When the human body is stationary or the fixed heat source is turned on in the kitchen, the infrared light is incident on the outside, and the sensor has no output. The dual-element pyroelectric infrared sensor receives different infrared radiation and outputs a pulse signal if and only when the human body moves in the kitchen or when the infrared detector moves, and the amplitude of the pulse signal is proportional to the amount of infrared radiation received.

The filter amplifier is used for filtering and amplifying the weak pulse signal outputted by the dual pyroelectric infrared sensor, and the model of the filter amplifier is BIS0001.

The driving circuit is used under the control of the controller to generate a forward or reverse DC current flowing through the micro DC electromagnet, thereby generating a suction force or thrust on the permanent magnet on the grid strut to drive the grid on the hinge The pole rotates to form a switch between the human body monitoring and the heat source scanning. The driving circuit is realized by two push-pull power amplifier circuits composed of two symmetrical NPN type and PNP type triode tubes.

As shown in FIG. 4 and FIG. 5, the grid actuator comprises a DC electromagnet 15, a DC electromagnet holder 16, a first hinge 17, a second hinge 18, a third hinge 19, a limit baffle 20, and a grid support. The rod 21 and the permanent magnet 22 are composed of a screw fixing hole on the DC electromagnet holder 16, the limit stopper 20, the grid stay 21, and the permanent magnet 22. The grid actuator is used for automatic switching between the human body monitoring and the heat source scanning under the driving of the driving circuit.

The grid struts are configured to receive a human body moving target signal at a maximum sensing angle under a human body monitoring state, and generate a minimum sensing angle of the grid curtain gap in the heat source scanning state to detect the heat source infrared radiation amount at each angle. The grid struts are made of non-ferrous metal (such as aluminum alloy), and the root of the grid struts fixes a circular permanent magnet through four screw fixing holes, and the surface area of the circular permanent magnet and the surface area of the DC electromagnet One to two, the other two screw fixing holes are used for the fixed connection of the grating struts and the second hinge, and the grating screen 23 installed under the grating struts is made of black paper.

The limiting baffle is used to define an angle at which the grid struts are pivoted with the second hinge as an axis. The limit baffle is made of non-ferrous metal (such as aluminum alloy), and two screw fixing holes are used for fixing the baffle to the first hinge.

The DC electromagnet is used to generate a suction force or a thrust to drive the grating strut to form two states. When the DC electromagnet flows in one direction, the generated magnetic pole is different from the magnetic pole of the permanent magnet, and the DC electromagnet attracts the position of the grid struts with permanent magnets to the DC electromagnet, that is, the position of the heat source scanning state; When the DC electromagnet flows in the other direction, the generated magnetic pole is the same as the magnetic pole of the permanent magnet, and the DC electromagnet pushes the grating strut with the permanent magnet to the position of the limit baffle, that is, the human body monitoring state. Position; the DC electromagnet is fixed on the DC electromagnet holder, the DC electromagnet holder is made of non-ferrous metal (such as aluminum alloy), the DC electromagnet magnet is fixed by four screw fixing holes, and the other two screw fixing holes are used for DC power The magnet holder is fixedly connected to the third hinge. The first hinge, the second hinge, and the third hinge are connected by a coaxial cylindrical stack.

The hinge is used to connect the DC electromagnet holder, the limit baffle and the grid struts. Wherein, the first hinge is coaxial with the third hinge and is fixed on the box of the infrared detector, and the limiting baffle on the first hinge and the DC electromagnet fixing frame on the third hinge form a grid rotation angle, and the grid The angle of rotation of the curtain is related to the sensing angle of the infrared detector, and the angle of rotation of the screen is 90-maximum sensing angle/2.

The stepper motor is a 28BYJ48 stepping motor driven by a driver ULN2003. When the stepping driver ULN2003 receives the pulse signal sent by the controller, the stepping motor control circuit drives the stepping motor to drive the infrared detector to rotate the corresponding angle in the forward or reverse direction according to the set step direction, by controlling The number of pulses controlled by the device controls the angular displacement of the stepping motor, thereby achieving the purpose of directional acquisition of infrared radiation data at various angles. The stepping motor 0° position recognition circuit is composed of an LED lamp on the center line of the infrared detector and a photoresistor in the 0° position gap on the center line of the box body. Only when the stepping motor drives the neutral line of the infrared controller to rotate to coincide with the center line of the box body, the photoresistor on the board circuit board can receive the light of the LED to realize 0° position recognition; the LED light on the center line of the infrared detector is It is a 0° position light.

The voice circuit uses an ISD1700 voice chip. The chip contains a full range of integrated system functions such as automatic gain control, microphone preamplifier, speaker driver circuit, oscillator and memory. The chip uses direct storage analog signal technology to permanently store pre-recorded voice alarm signals. During playback, under the control of the controller, periodic segmentation playback is automatically performed according to the degree of danger of fixing the heat source in the unmanned state of the kitchen. The external speaker is connected to the speaker driving line in the voice circuit, and is used for externally connecting to a living room such as a kitchen, so that the user can hear the voice alarm at any time and timely handle the danger in the kitchen.

The controller uses the STC15F2K60S2 microcontroller. In addition to the large capacity, high speed and wide operating voltage of the chip, the STC15F2K60S2 MCU is mainly used because it has a large-capacity on-chip EEPROM (FLASH), which can be used to store the infrared radiation data of various angles and the infrared radiation data of various angles in advance. According to the fixed heat source infrared data storage voice playback period and the accumulated time of no fire in the kitchen, etc.; the internal high-speed 8-channel 10-bit ADC can be used to directly collect the infrared radiation data of the infrared detector at different angles under the heat source scanning state. Wait.

The button circuit is disposed at a bottom end of the case. There are two buttons on the monitoring device, one is the power switch button of the device, and the other is the self-test button; the status indicator is represented by three LED lights respectively, "heat source scanning", "human body monitoring", "system self-test" three Kind of work status. Press the power switch to power on the device; if it is necessary to check whether the monitoring device works normally, press the self-test button, then the “system self-test” light is on, the device first enters the “human body monitoring” state, when the infrared receiver receives When the mobile body signal is recognized and can be recognized, the corresponding "human body monitoring" light is on, otherwise the "human body monitoring" is shining, indicating that there is a fault in this state; the device automatically enters the heat source scanning state after detecting the human body monitoring state, and the DC electromagnet attracts the driving grid. The curtain is closed, and the stepping motor is used for scanning movement. When the infrared receiver receives the fixed heat source signal and can perform orientation recognition, the corresponding "heat source scanning" light is on, otherwise the "heat source scanning" is flashing, indicating that there is a fault in this state.

The switching power supply module is used to generate +5V and +12V power supplies, and the +5V power supply supplies power to the stepper motor control circuit of the controller, the stepping motor 0° position recognition circuit, the status indicator, the language circuit and the stepping motor; The +12V power supply supplies power to the infrared detector through an external signal power line.

In this embodiment, the infrared detector is modified by the basic principle of detecting the fixed heat source by the rotation of the infrared detector. Wherein, the infrared detector is integrally mounted on the rotating shaft of the stepping motor above the box body, and the infrared detector is 0° (ie, in the middle position) to +90° (ie, right to 90°) and −90° (ie, Turn left to 90°) to scan and store the heat source radiation signal data at various angles in the kitchen.

When the project is installed, the box is hung on the wall of the kitchen. The installation location should be back to the sun, wide field of view, higher than the ground, the specific location depends on the scene at the entrance to the kitchen, the kitchen entrance to the left side of the device.

The schematic diagram of the infrared detector heat source scanning state is shown in Fig. 6. The infrared detector body monitoring state working diagram is shown in Fig. 7. The infrared detector human body monitoring state recognition moving human body entering mode working diagram is shown in Fig. 8, infrared detector The human body monitoring state recognizes the human body walking out mode working diagram shown in Figure 9. The infrared detector consists of a 0° position LED lamp, a drive circuit, a dual pyroelectric infrared sensor, a filter amplifier, a gate actuator, and a cylindrical Fresnel lens. Wherein, the dual pyroelectric infrared sensor 24 is located at the focus of the column type Fresnel lens 13 to concentrate the infrared rays radiated by the target on the sensor; the width of the gate slit 27 is between the two "bright areas" plus one " The width of the dark area is to ensure that the infrared radiation amount of the heat source in the corresponding angle, that is, the induction angle 14 can be effectively received by the sensor when scanning the heat source; the controller controls the DC electromagnet 15 on the gate actuator through the driving circuit, The opening and closing operations of the first grating curtain 25 and the second grating curtain 26 are performed in cooperation with the first hinge 17, the second hinge 18, and the limit baffle 20. In Fig. 8, the direction of the arrow is the direction in which the human body enters from the kitchen door; in Fig. 9, the direction of the arrow is the direction in which the human body walks out of the kitchen door.

In this embodiment, a method for monitoring a device for automatically monitoring a heat source in a domestic kitchen includes the following steps:

S1, boot initialization; when no one enters the kitchen, and all the fixed heat sources in the kitchen are turned off, press the device's power ammonium button, the system first performs the measurement of the initial data;

S11. Entering the human body monitoring state; the controller of the device first sends a control command to the driving circuit in the infrared detector, and the driving gate actuator generates a driving force, that is, the DC electromagnet generates the same magnetic pole as the permanent magnet on the grating strut. Pushing the two grids to the position of the limit baffle, so that the first grating and the second grating are both opened. At this time, the infrared detector is at the 0° position, and the device is in the human body monitoring state; As shown in Figure 7;

S12, collecting the initial comparison value V _{n of the} human body monitoring state; the controller then controls the stepping motor to have a step angle of 1° and a stepping pulse frequency of 18 Hz, and then return to the 0° position after stepping +5°, and simultaneously storing the infrared detector at The infrared data value V _n measured in this state is stored in the data memory of the controller as an initial comparison value for identifying no one in the kitchen and no fixed heat source is turned on; the infrared data value V _{n is} the initial state of the human body monitoring state. Comparison value V _n ;

S2, identifying that the moving human target enters the kitchen; after the initialization is completed, the system is transferred to the human body monitoring state; when someone enters the kitchen, the dual pyroelectric infrared sensor receives the pulse signal of the moving human body infrared radiation after filtering and amplifying After being sent to the controller for signal processing, it is determined that after moving the human body target in the human body sensing angle, the controller of the device issues a control command to the driving circuit in the infrared detector, and drives the DC electromagnet to generate a permanent magnet pole on the grid strut. Sexually different magnetic poles, attracting the second grid to the position of the DC electromagnet holder, that is, being closed, while the first grid remains open and the induction angle is halved. Infrared detector human body monitoring state recognition mobile human body entering mode work diagram shown in Figure 8. If the human target can still be detected, it indicates that the human body enters the kitchen, and the device does not alarm the heat source. Otherwise, the human body does not enter the kitchen and returns to the human body monitoring state.

S3, identifying that the moving human body is out of the kitchen; after confirming that the human body enters the kitchen, the controller of the device issues a control command to the driving circuit in the infrared detector, which is opposite to the process of the step S2, that is, the first grating to the DC electromagnet holder The position is closed, while the second grid remains open, halving the induction angle. Infrared detector human body monitoring state recognition human body Out of the mode work diagram shown in Figure 9. If the human target can be monitored, it means that the mobile body is out of the kitchen, otherwise it will be treated as a person in the kitchen and returned to the human body monitoring state.

S42. Acquisition and comparison of the current value v _n of the infrared radiation in the human body monitoring state sensing angle; the controller then controls the stepping motor to have a step angle of 1° and a stepping pulse frequency of 18 Hz, and then return to the 0° position after stepping +5°. And storing the infrared data value v _n measured by the infrared detector in this state, and comparing with the initial comparison value V _n of the unmanned kitchen in the kitchen stored in the data memory without any fixed heat source, if v _n > V _n , indicating that there is no one in the kitchen, there is a fixed heat source to open, to enter the next identification, otherwise, it is determined that no one in the kitchen, no fixed heat source is turned on, return to step S2;

S45, the heat source data is collected from 0° to -90° in the scanning state of the heat source; in the same process as step S43, the controller controls the stepping motor to have a step angle of 1° and a stepping pulse frequency of 18 Hz, after stepping to -90°. Then jump back to the 0° position, and store the infrared data values a _-1 , ... a _-i ... a _-89 , a - ₉₀ measured by the infrared detector every 1 ° in this state in the data memory of the controller;

S47. Comparison of infrared radiation data of fixed heat sources at various angles; comparing the infrared data value a _i of the heat source measured at each angle with the initial comparison value A _{i of the} fixed heat source, if a _i >A _i , indicating that there is a fixed heat source at the angle i, otherwise there is no The heat source returns to step S4 to measure a _i , and compares the data of each group a _i with the upper group. The rising value indicates that the temperature of the heat source rises, otherwise the temperature of the heat source drops; the large value indicates that the temperature of the heat source is high, and the detection is continuous N times. When the angle value is higher than the set value, the angle is stored, and the next step is entered. Otherwise, when all the angle data is lower than the set value, it is determined that no one in the kitchen is opened, and no fixed heat source is turned on, and the process proceeds to step S6;

S48, identifying a static human body in the kitchen; continuously detecting N times a _i and the upper group for numerical comparison, when the a _i value is abrupt, at a certain moment, the mutation is less than or equal to A _i and remains unchanged, indicating that there is The static human body has existed, and the infrared radiation data of the human body has suddenly changed and decreased, and it is treated by someone in the kitchen; otherwise, it will enter the next step.

S5, the degree of risk identification and automatic speech source alarm; fire when the inner angle of the fixed heat source is an induction fire, the amount of infrared radiation, the infrared data collected is large, the value is continuously detected N times a _i exceeds the set maximum When the value is set, the controller automatically speeds up the set time period of the voice circuit playback. When the set play time is reached, the controller controls the voice circuit to connect to the speaker outside the kitchen through the lead wire at the speaker interface to send out "Your kitchen has a fire is on." significant, large fire, you have to leave the kitchen XX minutes, please pay attention to safety "; when the fire is a small fire, the small amount of infrared radiation, infrared data collected is small, continuous detection value of more than N times a _i When the minimum value is set, the controller automatically lengthens the voice circuit playback setting time period. When the set playback time is reached, the controller controls the voice circuit to connect to the speaker outside the kitchen through the speaker at the speaker interface. The fire is on, the fire is a small fire, you have left the kitchen for XX minutes, please pay attention to safety"; when the fire is medium fire, the amount of infrared radiation is medium, the infrared data collected is between Intermediate value, the intermediate is continuously detected exceeds a set value, the controller automatically play voice circuits moderate set time period N times the value of a _i, when the set of playing time, the controller controls the speaker voice circuits via interface leads The speaker connected to the outside of the kitchen issued "The fire in your kitchen is open, the fire is medium fire, you have left the kitchen for XX minutes, please pay attention to safety";

S6. Re-acquisition and update of initialization data; when step S4 determines that there is no one in the kitchen and no fixed heat source is turned on, the uncertainty includes sunlight infrared radiation, day and night temperature difference, and The opening and closing of the kitchen window causes the initial comparison value to change, and needs to be re-measured. The method is the same as step S1, and the initial comparison value V _{n of the} re-measured human monitoring state and the initial comparison value A _{i of the} heat source scanning state are fixed. The original value provides initialization data for the next identification and proceeds to the next step;

In this embodiment, the software program flow chart is shown in FIG. 10, and the software design includes the following steps:

1, program initialization

It mainly performs initial configuration of the internal resources of the controller, including reset source, clock, serial port, AD, external memory, voltage reference, port, crystal oscillator, interrupt, etc., in order to prepare for the normal operation of the controller.

2, looking for the starting point of the motor 0 ° position

The main function is to find the 0° boundary of the stepping motor when the stepping motor reciprocates in the range of 18°/s and ±90°, as the starting point for collecting the infrared radiation data in the sensing angle region of the infrared detector.

3, collecting dynamic initialization comparison data

It mainly collects environmental data in two states in the sensing angle region of the dynamic lower outer detector.

The above-mentioned embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of protection of the invention should be determined by the claims.

Claims

A device for automatically monitoring a heat source in a domestic kitchen, comprising: a controller and a stepping motor control circuit connected to the controller, an infrared detector, a stepping motor 0° position recognition circuit, a status indicator, a button, and a voice a stepping motor control circuit is connected with a stepping motor; the infrared detector is used for monitoring the moving human body and detecting the amount of infrared radiation of all fixed heat sources in the kitchen, including the driving circuit and the dual element pyroelectric infrared a sensor, a filter amplifier, a grating actuator, and a Fresnel lens, the filter amplifier being coupled to a controller, the dual pyroelectric infrared sensor being coupled to a filter amplifier, the Fresnel lens being disposed in a dual-element pyrolysis a front end of the electric infrared sensor, the driving circuit is connected to the controller, and the gate actuator is connected to the driving circuit; the driving circuit is used under the control of the controller to generate forward and reverse direct current flowing through the direct current a magnet; the grating actuator is used for realizing human body monitoring and heat source scanning under driving of a driving circuit Switching; the dual pyroelectric infrared sensor is used to identify a moving heat source; the Fresnel lens is used to concentrate the infrared light radiated by the target to the dual pyroelectric infrared sensor located at the focus of the lens The dual pyroelectric infrared sensor is configured to identify a moving heat source, and the filter amplifier is configured to filter and amplify a weak pulse signal output by the dual pyroelectric infrared sensor.
The apparatus for automatically monitoring a heat source in a domestic kitchen according to claim 1, wherein the Fresnel lens concentrates infrared rays radiated by the target to a dual element located at a focus of the lens through a concentric narrow band on the mirror surface thereof. On the pyroelectric infrared sensor, the sensing angle is divided into the "bright area" and the "dark area" of the interval. When the human body moves to the sensing angle, the generated continuous light pulse is radiated on the dual pyroelectric infrared sensor.
The apparatus for automatically monitoring a heat source in a domestic kitchen according to claim 1, wherein the gate actuator comprises a DC electromagnet, a DC electromagnet holder, a permanent magnet, a limit baffle, a grating screen, and a grid stay And three hinges connected by a coaxial cylindrical stack; the DC electromagnet is disposed in a DC electromagnet holder; the permanent magnet is fixed at a root of the grid strut; The grating curtain is made of non-ferrous metal, and the root of the grating struts fixes a circular permanent magnet through four screw fixing holes, the surface area of the circular permanent magnet and the size of the DC electromagnet The surface area is the same. The other two screw fixing holes are used for the fixed connection of the grating struts and the second hinge. The grating screen installed under the grating struts is made of black paper to reduce the weight of the screen.
The apparatus for automatically monitoring a heat source in a domestic kitchen according to claim 1, wherein said filter amplifier is of a type BIS0001; said stepper motor is a 28BYJ48 type stepping motor driven by a driver ULN2003; said voice circuit is ISD1700 voice chip; the controller uses STC15F2K60S2 microcontroller.
The apparatus for automatically monitoring a heat source in a domestic kitchen according to claim 1, wherein the controller, the voice circuit, the stepping motor 0° position recognition circuit are disposed in the housing, and the status indicator and the button are set. On the front panel of the housing; the infrared detector is coupled to the stepper motor in the housing by a stepper motor shaft.
The device for automatically monitoring a heat source in a domestic kitchen according to claim 5, wherein the stepping motor 0° position recognition circuit comprises an LED lamp on the center line of the infrared detector and a 0° position gap on the center line of the box body. The photosensitive resistor is composed; the LED light on the center line of the infrared detector is a 0° position light;

The button is disposed at a bottom end of the box body; the state indication is represented by three LED lights respectively: "heat source scanning", "human body monitoring", and "system self-checking" three working states.
The apparatus for automatically monitoring a heat source in a domestic kitchen according to claim 1, further comprising: a power source for monitoring the power of the reminder device, wherein the power source is implemented by the open-switch power module for generating +5V and +12V Power supply, +5V power supply to the stepper motor control circuit of the controller, stepper motor 0° position recognition circuit, status indicator, voice circuit and stepper motor supply; +12V power supply to the infrared detector through the external signal power line .
A method for monitoring a device for automatically monitoring a heat source in a domestic kitchen according to any one of claims 1 to 7, comprising the steps of:

S1, boot initialization; when no one enters the kitchen, and all fixed heat sources in the kitchen are turned off, press the power button of the device, the system first performs the measurement of the initial data;

S2, identifying that the moving human target enters the kitchen; after the initialization is completed, the system is transferred to the human body monitoring state; when someone enters the kitchen, the dual pyroelectric infrared sensor receives the pulse signal of the moving human body infrared radiation after filtering and amplifying After being sent to the controller for signal processing, it is determined that after moving the human body target in the sensing angle, the controller of the device issues a control command to the driving circuit in the infrared detector, and drives the DC electromagnet to generate the polarity of the permanent magnet on the grid strut. Different magnetic poles, the second grid screen is attracted to the position of the DC electromagnet holder, that is, it is closed, and the first grid screen remains open, so that the induction angle is halved; when the human target is monitored, the human body enters the kitchen. The device does not alarm the heat source, otherwise it returns to the human body monitoring state as the human body does not enter the kitchen;

S3, identifying that the moving human body is out of the kitchen; after confirming that the human body enters the kitchen, the controller of the device issues a control command to the driving circuit in the infrared detector, which is opposite to the process of the step S2, that is, the first grating to the DC electromagnet holder The position is closed, and the second grid remains open, so that the induction angle is halved; when the target is detected, it indicates that the moving body is out of the kitchen, otherwise it is treated as a person in the kitchen and returned to the human body monitoring state;

S4, identifying whether the fixed heat source is turned on in the unmanned state in the kitchen; first determining whether the kitchen is in an unmanned state in the human body monitoring state, and when detecting that the kitchen is in an unmanned state, starting to identify the open state of the fixed heat source in the kitchen;

S5, the degree of risk identification and automatic speech source alarm; fire when the inner angle of the fixed heat source is an induction fire, the amount of infrared radiation, the infrared data collected is large, the value is continuously detected N times a i exceeds the set maximum When the value is set, the controller automatically speeds up the set time period of the voice circuit playback. When the set play time is reached, the controller controls the voice circuit to connect to the speaker outside the kitchen through the lead wire at the speaker interface to send out "Your kitchen has a fire is on." significant, large fire, you have to leave the kitchen XX minutes, please pay attention to safety "; when the fire is a small fire, the small amount of infrared radiation, infrared data collected is small, continuous detection value of more than N times a i When the minimum value is set, the controller automatically lengthens the voice circuit playback setting time period. When the set playback time is reached, the controller controls the voice circuit to connect to the speaker outside the kitchen through the speaker at the speaker interface. The fire is on, the fire is a small fire, you have left the kitchen for XX minutes, please pay attention to safety"; when the fire is medium fire, the amount of infrared radiation is medium, the infrared data collected is between Intermediate value, the intermediate is continuously detected exceeds a set value, the controller automatically play voice circuits moderate set time period N times the value of a i, when the set of playing time, the controller controls the speaker voice circuits via interface leads The speaker connected to the outside of the kitchen issued "The fire in your kitchen is open, the fire is medium fire, you have left the kitchen for XX minutes, please pay attention to safety";

S6. Re-acquisition and update of initialization data; when step S4 determines that there is no one in the kitchen, and no fixed heat source is turned on, the uncertainty includes sunlight infrared radiation, day and night temperature difference due to current environmental uncertainty, And the opening and closing of the kitchen window, the initial comparison value will change, need to be re-measured, the method is the same as step S1, the initial comparison value V n of the re-measured human monitoring state and the heat source scanning state are fixed at different angles of the heat source initial comparison value A i Overwrite the original value, provide initialization data for the next identification, and proceed to the next step;

S7, fixed heat source and static human body angle storage; clear the timing of the alarm accumulation time, store the confirmed fixed heat source and static human body angle, and prepare for the next time the user uses the kitchen;

S8, self-test test; press the self-test button, at this time the "system self-test" light is on, the controller first enters the "human body monitoring" state, when the infrared receiver receives the mobile body signal and can recognize, corresponding to "human body monitoring" The light is on, otherwise the "human body monitoring" is shining, indicating that the state is faulty; the controller then enters the "heat source scanning", the DC electromagnetic attraction drives the grid curtain to close, the stepping motor performs the scanning motion, and when the infrared receiver receives the fixed When the heat source signal is capable of azimuth recognition, the corresponding "heat source scan" light is on, otherwise the "heat source scan" light is blinking.
The method for monitoring an apparatus for automatically monitoring a heat source in a domestic kitchen according to claim 8, wherein in the step S1, the measuring the initialization data comprises the following steps:

S11. Entering the human body monitoring state; the controller of the device first sends a control command to the driving circuit in the infrared detector, and the driving gate actuator generates a driving force, that is, the DC electromagnet generates the same magnetic pole as the permanent magnet on the grating strut. Pushing the two grids to the position of the limit baffle, so that the first grating and the second grating are both opened. At this time, the infrared detector is at the 0° position, and the device is in the human body monitoring state;

S12, collecting the initial comparison value V n of the human body monitoring state; the controller then controls the stepping motor to have a step angle of 1° and a stepping pulse frequency of 18 Hz, and then return to the 0° position after stepping +5°, and simultaneously storing the infrared detector at The infrared data value V n measured in this state is stored in the data memory of the controller as an initial comparison value for identifying no one in the kitchen and without any fixed heat source being turned on; the infrared data value V n is the human body monitoring state Initial comparison value V n ;

S13. Entering the heat source scanning state; the controller of the device sends a control command to the driving circuit in the infrared detector, and the driving gate actuator generates a suction force, that is, the DC electromagnet generates a polarity different from the permanent magnet on the grid stay. The magnetic poles are connected to the position of the DC electromagnet fixing frame, so that the first grating screen and the second grating screen are closed, and the infrared detector is in the 0° position, and the device is in the heat source scanning state;

S14. Collecting the heat source scanning state to fix the initial heat source initial comparison value A i at each angle; the controller then controls the stepping motor to have a step angle of 1° and a stepping pulse frequency of 18 Hz, and then jump back to the 0° position after stepping +90°, and simultaneously Store the infrared data values A +1 , ... A + i ... A +89 , A + 90 measured in the state of the infrared detector in this state in the data memory of the controller; similarly, scan from 0 ° to -90°, and store the infrared data values A -1 , ... A - i ... A - 89 , A - 90 measured by the infrared detector in this state every 1 ° in the data memory of the controller; the infrared data The value A i is the fixed heat source initial comparison value A i .
The method for monitoring a device for automatically monitoring a heat source in a domestic kitchen according to claim 8, wherein in step S4, the identifying whether the fixed heat source is turned on in an unmanned state in the kitchen comprises the following steps:

S41. The device is recognized by the human body monitoring state and is transferred to the human body monitoring state. When the mobile body is monitored, according to someone in the kitchen, the process returns to step S3, otherwise the process proceeds to the next step;

S42. Acquisition and comparison of the current value v n of the infrared radiation in the human body monitoring state sensing angle; the controller then controls the stepping motor to have a step angle of 1° and a stepping pulse frequency of 18 Hz, and then return to the 0° position after stepping +5°. And storing the infrared data value v n measured by the infrared detector in this state, and compared with the initial comparison value V n that is not in the kitchen that has been stored in the data memory, and without any fixed heat source being turned on, if v n >V n , indicating that there is no one in the kitchen, there is a fixed heat source to open, to enter the next identification, otherwise, it is determined that there is no one in the kitchen, and no fixed heat source is turned on, return to step S2;

S43. Enter the heat source data collection from 0° to +90° in the heat source scanning state; the controller then controls the stepping motor to have a step angle of 1° and a stepping pulse frequency of 18 Hz, and then jump back to the 0° position after stepping +90°. At the same time, the infrared data values a +1 , ... a + i ... a + 89 , a + 90 measured by the infrared detector in this state every 1 ° are stored in the data memory of the controller;

S44. Entering the human body monitoring state and staying at the T1 time, when monitoring the moving human body, according to someone in the kitchen, returning to step S3, otherwise proceeding to the next step;

S45, the heat source data is collected from 0° to -90° in the scanning state of the heat source; in the same step S43, the controller controls the stepping motor to have a step angle of 1° and a stepping pulse frequency of 18 Hz, and then skips after stepping -90°. Returning to the 0° position, and storing the infrared data values a -1 , ... a -i ... a -89 , a - 90 measured by the infrared detector every 1 ° in this state in the data memory of the controller;

S46. Entering the human body monitoring state and staying for T2 time, when monitoring the moving human body, according to someone in the kitchen, returning to step S3, otherwise proceeding to the next step;

S47. Comparison of infrared radiation data of fixed heat sources at various angles; comparing the infrared data value a i of the heat source measured at each angle with the initial comparison value A i of the fixed heat source, if a i >A i , indicating that there is a fixed heat source at the angle i, otherwise there is no The heat source returns to step S4 to measure a i cyclically, and compares the data of each group a i with the upper group. The rising value indicates that the temperature of the heat source rises, otherwise the temperature of the heat source decreases; the value is large, indicating that the temperature of the heat source is high, and the detection is continuous N times. When the angle value is higher than the set value, the angle is stored, and proceeds to the next step; otherwise, when all the angle data is lower than the set value, it is determined that there is no one in the kitchen, and no fixed heat source is turned on, and the process proceeds to step S6;

S48, identifying a static human body in the kitchen; continuously detecting N times a i and the upper group for numerical comparison, when the a i value is abrupt, the mutation is less than or equal to A i and remains unchanged, indicating that there is a static human body at the angle i, When the human body leaves, the infrared radiation data is abruptly changed and reduced, and it is treated by someone in the kitchen; otherwise, it enters the next step.