Composite detection system for domestic kitchen fires

Abstract

This invention discloses a composite detection system for household kitchen fires. The composite detection system includes: a signal acquisition device comprising a temperature sensor, a humidity sensor, a catalytic combustion gas sensor, and a dual-band smoke detector. The temperature sensor acquires the temperature signal of the household kitchen, the humidity sensor acquires the humidity signal, the catalytic combustion gas sensor acquires the gas concentration signal, and the dual-band smoke detector acquires the smoke concentration signal; a signal processing and control device electrically connected to the temperature sensor, humidity sensor, catalytic combustion gas sensor, and dual-band smoke detector, respectively, for determining whether a fire has occurred in the household kitchen; and an alarm device wirelessly connected to the signal processing and control device for receiving and executing alarm commands. The composite detection system for household kitchen fires of this invention has advantages such as low false alarm rate and fast response.

Description

Technical Field

[0001] This invention relates to the field of fire safety technology, and in particular to a composite detection system for household kitchen fires. Background Technology

[0002] Kitchen fire safety is a fundamental requirement for daily home life, as the kitchen is a major source of fires in residential homes. For example, unattended use of fire, failure to turn off the gas promptly, dry-burning of boilers, and carelessly discarded cigarette butts can easily create safety hazards. Timely and reliable fire detectors are crucial for effectively implementing subsequent firefighting measures, reducing fire losses, and protecting life and property. However, in addition to addressing typical kitchen hazards such as gas leaks and dry-burning open flames, kitchen fire detection devices must also eliminate false alarms from sources of interference such as humidity, heat, kitchen fumes, and dust. Summary of the Invention

[0003] This invention aims to at least partially address one of the technical problems in related technologies. Therefore, the object of this invention is to provide a composite detection system for household kitchen fires, in order to reduce false fire alarms caused by interference sources in the kitchen.

[0004] To achieve the above objectives, this invention proposes a composite detection system for household kitchen fires. The system includes a signal acquisition device, a signal processing and control device, and an alarm device. The signal acquisition device includes a temperature sensor, a humidity sensor, a catalytic combustion gas sensor, and a dual-band smoke detector. The temperature sensor acquires the temperature signal of the household kitchen, the humidity sensor acquires the humidity signal, the catalytic combustion gas sensor acquires the gas concentration signal, and the dual-band smoke detector acquires the smoke concentration signal. The signal processing and control device is electrically connected to the temperature sensor, humidity sensor, catalytic combustion gas sensor, and dual-band smoke detector, respectively, and performs threshold judgments on the temperature signal, humidity signal, gas concentration signal, and smoke concentration signal to determine whether a fire has occurred in the household kitchen, and generates an alarm command when a fire occurs. The alarm device is wirelessly connected to the signal processing and control device and receives and executes the alarm command.

[0005] In addition, the composite detection system for household kitchen fires according to embodiments of the present invention may also have the following additional technical features:

[0006] According to one embodiment of the present invention, before the signal processing control device performs threshold judgment on the gas concentration, the signal processing control device performs moving average filtering on the gas concentration signal, specifically by: setting a first queue buffer and a second queue buffer of fixed length; when a new sample value is input into the first queue buffer, the tail data of the first queue buffer is removed, and the mean of all sample values ​​in the first queue buffer at this time is output to the second queue buffer; when the mean of a new sample value is input into the second queue buffer, the tail data of the second queue buffer is removed, and the mean of all data in the second queue buffer at this time is used as the filtered gas concentration output.

[0007] According to one embodiment of the present invention, the smoke concentration signal includes red light sampling AD values ​​and blue light sampling AD values. When the signal processing control device performs threshold judgment on the smoke concentration signal, it specifically performs the following: genetic encoding of the red light sampling AD values ​​and blue light sampling AD values ​​using binary encoding to generate a coded population, wherein the high eight bits represent the red light threshold and the low eight bits represent the blue light threshold; and calculating the fitness value represented by the genotype of each individual in the coded population using a fitness function, wherein the fitness function is... and x represents the red light sampling AD value, and y represents the blue light sampling AD value; the individual genotypes are screened using a roulette wheel algorithm, randomly selecting certain genes for elimination, where the probability of elimination is... f i The fitness value represented by the individual genotype is indicated by n, which represents the number of individual genotypes in the encoded population; single-point crossover inheritance is performed on the screened individual genotypes; and the threshold of smoke concentration is obtained through gene mutation.

[0008] According to one embodiment of the present invention, the catalytic combustion gas sensor includes: a detection element, a compensation element, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, and a first operational amplifier; one end of the detection element and the compensation element are connected together with one end of the third resistor, the other end of the detection element is grounded, the other end of the compensation element is electrically connected to a preset power supply, one end of the first resistor and the second resistor are connected together with the non-inverting input terminal of the first operational amplifier, the other end of the first resistor is electrically connected to the preset power supply, the other end of the second resistor is grounded, the other end of the third resistor is electrically connected to the inverting input terminal of the first operational amplifier, one end of the fourth resistor is electrically connected to the inverting input terminal of the first operational amplifier, the other end of the fourth resistor is electrically connected to the output terminal of the first operational amplifier, the fifth resistor and the first capacitor are connected in series, the other end of the fifth resistor is electrically connected to the output terminal of the first operational amplifier, and the other end of the first capacitor is grounded.

[0009] According to one embodiment of the present invention, the alarm device includes: a wireless signal transmission module, wirelessly connected to the signal processing control device, for transmitting the alarm command; and an audible and visual alarm module, electrically connected to the wireless signal transmission module, for issuing a first audible and visual alarm signal according to the alarm command.

[0010] According to one embodiment of the present invention, the system is powered by a battery, and the system further includes: a battery monitoring device electrically connected to the signal processing control device, for monitoring the state parameters of the battery; wherein, the signal processing control device is further configured to control the audible and visual alarm module to issue a second audible and visual alarm signal when it is determined that the battery is undervoltage based on the state parameters.

[0011] According to one embodiment of the present invention, the audible and visual alarm module includes: a first transistor, a sixth resistor, a seventh resistor, an inductor, and a buzzer; the base of the first transistor is electrically connected to the wireless signal transmission module through the sixth resistor, the collector of the first transistor is electrically connected to the first end of the inductor, the emitter of the first transistor is grounded, the first end of the seventh resistor is connected to the base of the first transistor, the second end of the seventh resistor is grounded, one end of the buzzer is electrically connected to the second end of the inductor, the other end of the buzzer is electrically connected to the third end of the inductor, and the second end of the inductor is electrically connected to a preset power supply.

[0012] According to one embodiment of the present invention, the dual-band smoke detector includes: a blue light-emitting diode driving circuit, a red light-emitting diode driving circuit, and a light-emitting diode receiving circuit.

[0013] According to one embodiment of the present invention, the blue LED driving circuit includes: an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a second transistor, a first chip, a first LED, and a second capacitor; the base of the second transistor is electrically connected to a signal processing control device through the eighth resistor, the collector of the second transistor is electrically connected to the third pin of the first chip through the ninth resistor, the emitter of the second transistor is grounded, one end of the tenth resistor is electrically connected to the base of the second transistor, and the other end of the tenth resistor is grounded, the first pin of the first chip is electrically connected to the collector of the second transistor, the second and third pins of the first chip are connected, the fifth and sixth pins of the first chip are connected, a preset power supply is electrically connected to the anode of the first LED, the cathode of the first LED is electrically connected to the fourth pin of the first chip, one end of the eleventh resistor is electrically connected to the preset power supply, and the other end of the eleventh resistor is electrically connected to the sixth pin of the first chip, the positive terminal of the second capacitor is electrically connected to the preset power supply, and the negative terminal of the second capacitor is grounded.

[0014] The red LED driving circuit includes: a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a third transistor, a second chip, and a second LED. The base of the third transistor is electrically connected to the signal processing control device through the twelfth resistor. The collector of the third transistor is electrically connected to the third pin of the second chip through the thirteenth resistor. The emitter of the third transistor is grounded. One end of the fourteenth resistor is electrically connected to the base of the third transistor, and the other end of the fourteenth resistor is grounded. The first pin of the second chip is electrically connected to the collector of the third transistor. The second and third pins of the second chip are connected. The fifth and sixth pins of the second chip are connected. A preset power supply is electrically connected to the anode of the second LED. The cathode of the second LED is electrically connected to the fourth pin of the second chip. One end of the fifteenth resistor is electrically connected to the preset power supply, and the other end of the fifteenth resistor is electrically connected to the sixth pin of the second chip.

[0015] According to one embodiment of the present invention, the LED receiving circuit includes: a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a receiving diode, a third capacitor, a fourth capacitor, a fifth capacitor, and a second operational amplifier; one end of the sixteenth resistor is electrically connected to the non-inverting input terminal of the second operational amplifier, and one end of the sixteenth resistor is grounded; the third capacitor is connected in parallel with the sixteenth resistor; one end of the seventeenth resistor and one end of the eighteenth resistor are shared with the inverting input terminal of the second operational amplifier; the other end of the seventeenth resistor is grounded; the other end of the eighteenth resistor is electrically connected to the output terminal of the second operational amplifier; the fourth capacitor is connected in parallel with the eighteenth resistor; the anode of the receiving diode is electrically connected to the non-inverting input terminal of the second operational amplifier; the cathode of the receiving diode is electrically connected to the inverting input terminal of the second operational amplifier; one end of the nineteenth resistor is electrically connected to the output terminal of the second operational amplifier; the other end of the nineteenth resistor is electrically connected to one end of the fifth capacitor; and the other end of the fifth capacitor is grounded.

[0016] This invention relates to a composite detection system for home kitchen fires. By monitoring and processing the temperature, humidity, gas concentration, and smoke concentration in the home kitchen in real time, the system can accurately obtain the fire status of the kitchen. This invention exhibits excellent resistance to interference in complex environments, distinguishing between fire aerosols and non-fire aerosols. It can accurately identify common kitchen environmental interference sources such as oil fumes, water mist, and dust, thus preventing detector alarms from being triggered. This invention also boasts advantages such as a low false alarm rate and fast response. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a composite detection system for household kitchen fires according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of a composite detection system for household kitchen fires according to another embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the process of performing moving average filtering on gas concentration according to an embodiment of the present invention;

[0020] Figure 4 This is a circuit diagram of a catalytic combustion gas sensor according to an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the structure of a composite detection system for household kitchen fires according to another embodiment of the present invention;

[0022] Figure 6 This is a circuit diagram of an audible and visual alarm module according to an embodiment of the present invention;

[0023] Figure 7 This is a circuit diagram of a blue light-emitting diode driving circuit according to an embodiment of the present invention;

[0024] Figure 8 This is a circuit diagram of a red light-emitting diode driving circuit according to an embodiment of the present invention;

[0025] Figure 9 This is a circuit diagram of a light-emitting diode receiving circuit according to an embodiment of the present invention. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] The following is a reference appendix. Figure 1 - Appendix Figure 9 This invention describes a composite detection system for home kitchen fires, according to an embodiment of the present invention.

[0028] Figure 1 This is a schematic diagram of the structure of a composite detection system for household kitchen fires according to an embodiment of the present invention.

[0029] like Figure 1 As shown, the composite detection system for household kitchen fires includes: a signal acquisition device 10, a signal processing and control device 20, and an alarm device 30. The signal acquisition device 10 includes a temperature sensor 101, a humidity sensor 102, a catalytic combustion gas sensor 103, and a dual-band smoke detector 104. The temperature sensor 101 acquires the temperature signal of the household kitchen, the humidity sensor 102 acquires the humidity signal, the catalytic combustion gas sensor 103 acquires the gas concentration signal, and the dual-band smoke detector 104 acquires the smoke concentration signal. The signal processing and control device 20 is electrically connected to the temperature sensor 101, humidity sensor 102, catalytic combustion gas sensor 103, and dual-band smoke detector 104, respectively, and performs threshold judgments on the temperature signal, humidity signal, gas concentration signal, and smoke concentration signal to determine whether a fire has occurred in the household kitchen, and generates an alarm command when a fire occurs. The alarm device 30 is wirelessly connected to the signal processing and control device 20 and receives and executes the alarm command.

[0030] Specifically, such as Figure 2As shown, the alarm device 30 includes a wireless signal transmission module 301 and an audible and visual alarm module 302. The wireless signal transmission module 301 is wirelessly connected to the signal processing and control device 20 and is used to transmit alarm commands; the audible and visual alarm module 302 is electrically connected to the wireless signal transmission module 301 and is used to issue a first audible and visual alarm signal according to the alarm command.

[0031] In this embodiment, by setting up a wireless signal transmission module 301, it is convenient to send out alarm signals and other information via wireless communication.

[0032] The composite detection system for home kitchen fires in this invention monitors the temperature, humidity, gas concentration, and smoke concentration in the home kitchen in real time, and processes these parameters to accurately obtain the fire status of the home kitchen in real time. Furthermore, this invention has advantages such as low false alarm rate and fast response.

[0033] In some embodiments of the present invention, such as Figure 3 As shown, before performing threshold judgment on the gas concentration, the signal processing control device 20 performs moving average filtering on the gas concentration signal, specifically for:

[0034] S1, set a first queue buffer and a second queue buffer with fixed lengths.

[0035] S2, when a new sample value is input into the first queue buffer, the tail data of the first queue buffer is removed, and the mean of all sample values ​​in the first queue buffer at this time is output to the second queue buffer.

[0036] S3, when the new sampled average value is input into the second queue buffer, the tail data of the second queue buffer is removed, and the average value of all data in the second queue buffer at this time is used as the filtered gas concentration output.

[0037] In some embodiments of the present invention, the smoke concentration signal includes red light sampling AD values ​​and blue light sampling AD values. When the signal processing control device performs threshold judgment on the smoke concentration signal, it processes the red light sampling AD values ​​and blue light sampling AD values ​​using a legacy algorithm to determine whether a fire has occurred in the home kitchen. Specifically used for:

[0038] S41, use binary encoding to encode the AD values ​​of red light sampling and blue light sampling to generate a coding population, where the high eight bits represent the red light threshold and the low eight bits represent the blue light threshold;

[0039] S42, using the fitness function, calculates the fitness value represented by the genotype of each individual in the coding population, where the fitness function is: and x represents the red light sampling AD value, and y represents the blue light sampling AD value;

[0040] S43 uses a roulette wheel algorithm to screen individuals by genotype, randomly selecting certain genes for elimination, where the probability of elimination is... f i This represents the fitness value associated with an individual's genotype, where n represents the number of individual genotypes in the encoded population.

[0041] S44, perform single-point crossover inheritance on the genotypes of the selected individuals. Single-point crossover inheritance involves randomly selecting a crossover point in the individual's coding string and then allowing each group of individuals to exchange genes according to the crossover point.

[0042] S45, through gene mutation, obtains the threshold of smoke concentration. The gene mutation adopts basic bit variation, which is to mutate one or more random bits in the individual's coding string.

[0043] As a feasible implementation, the signal acquisition device 10 further includes an amplifier circuit that is electrically connected to the temperature sensor 101, humidity sensor 102, catalytic combustion gas sensor 103 and dual-band smoke detector 104 respectively, for amplifying and processing the temperature signal, humidity signal, gas concentration signal and smoke concentration signal.

[0044] Specifically, such as Figure 4 As shown, the catalytic combustion gas sensor 103 includes: a detection element D, a compensation element C, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, and a first operational amplifier OPA1; one end of the detection element D and the compensation element C are connected to one end of the third resistor R3, the other end of the detection element D is grounded, the other end of the compensation element C is electrically connected to a preset power supply, one end of the first resistor R1 and the second resistor R2 are connected to the non-inverting input of the first operational amplifier OPA1, the other end of the first resistor R1 is electrically connected to the preset power supply, the other end of the second resistor R2 is grounded, the other end of the third resistor R3 is electrically connected to the inverting input of the first operational amplifier OPA1, one end of the fourth resistor R4 is electrically connected to the inverting input of the first operational amplifier OPA1, the other end of the fourth resistor R4 is electrically connected to the output of the first operational amplifier OPA1, the fifth resistor R5 and the first capacitor C1 are connected in series, the other end of the fifth resistor R5 is electrically connected to the output of the first operational amplifier OPA1, and the other end of the first capacitor C1 is grounded.

[0045] In some embodiments of the present invention, such as Figure 5As shown, the system is powered by a battery and also includes a battery monitoring device 40, which is electrically connected to the signal processing control device 20 and is used to monitor the battery's status parameters. The signal processing control device 20 is also used to control the audible and visual alarm module 302 to issue a second audible and visual alarm signal when the battery is determined to be undervoltage based on the status parameters.

[0046] In some embodiments of the present invention, such as Figure 6 As shown, the audible and visual alarm module 302 includes: a first transistor V1, a sixth resistor R6, a seventh resistor R7, an inductor L, and a buzzer BZ1; the base of the first transistor V1 is electrically connected to the wireless signal transmission module 301 through the sixth resistor R6, the collector of the first transistor V1 is electrically connected to the first end of the inductor L, the emitter of the first transistor V1 is grounded, the first end of the seventh resistor R7 is connected to the base of the first transistor V1, the second end of the seventh resistor R7 is grounded, one end of the buzzer BZ1 is electrically connected to the second end of the inductor L, the other end of the buzzer BZ1 is electrically connected to the third end of the inductor L, and the second end of the inductor L is electrically connected to a preset power supply.

[0047] In some embodiments of the present invention, the dual-band smoke detector 104 includes: a blue light-emitting diode driving circuit, a red light-emitting diode driving circuit, and a light-emitting diode receiving circuit.

[0048] Specifically, such as Figure 7 As shown, the blue LED driving circuit includes: an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a second transistor V2, a first chip U1, a first LED D1, and a second capacitor C2. The base of the second transistor V2 is electrically connected to the signal processing control device 20 through the eighth resistor R8, the collector of the second transistor V2 is electrically connected to the third pin of the first chip U1 through the ninth resistor R9, the emitter of the second transistor V2 is grounded, one end of the tenth resistor R10 is electrically connected to the base of the second transistor V2, and the other end of the tenth resistor R10... The first chip U1 is grounded, the first pin of the first chip U1 is electrically connected to the collector of the second transistor V2, the second and third pins of the first chip U1 are connected, the fifth and sixth pins of the first chip U1 are connected, the preset power supply is electrically connected to the anode of the first light-emitting diode D1, the cathode of the first light-emitting diode D1 is electrically connected to the fourth pin of the first chip U1, one end of the eleventh resistor R11 is electrically connected to the preset power supply, the other end of the eleventh resistor R11 is electrically connected to the sixth pin of the first chip U1, the positive terminal of the second capacitor C2 is electrically connected to the preset power supply, and the negative terminal of the second capacitor C2 is grounded.

[0049] More specifically, such as Figure 8As shown, the red LED driving circuit includes: a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a third transistor V3, a second chip U2, and a second LED D2. The base of the third transistor V3 is electrically connected to the signal processing control device 20 through the twelfth resistor R12, the collector of the third transistor V3 is electrically connected to the third pin of the second chip U2 through the thirteenth resistor R13, the emitter of the third transistor V3 is grounded, and one end of the fourteenth resistor R14 is connected to the emitter of the third transistor V3. The base is electrically connected, the other end of the fourteenth resistor R14 is grounded, the first pin of the second chip U2 is electrically connected to the collector of the third transistor V3, the second and third pins of the second chip U2 are connected, the fifth and sixth pins of the second chip U2 are connected, the preset power supply is electrically connected to the anode of the second light-emitting diode D2, the cathode of the second light-emitting diode D2 is electrically connected to the fourth pin of the second chip U2, one end of the fifteenth resistor R15 is electrically connected to the preset power supply, and the other end of the fifteenth resistor R15 is electrically connected to the sixth pin of the second chip U2.

[0050] It should be noted that the model number of the first chip U1 and the second chip U2 can be 2A120R.

[0051] As an example, such as Figure 9 As shown, the LED receiving circuit includes: a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a receiving diode D3, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a second operational amplifier OPA2. One end of the sixteenth resistor R16 is electrically connected to the non-inverting input of the second operational amplifier OPA2, and one end of the sixteenth resistor R16 is grounded. The third capacitor C3 is connected in parallel with the sixteenth resistor R16. One end of the seventeenth resistor R17 and one end of the eighteenth resistor R18 are connected to the inverting input of the second operational amplifier OPA2. The other end of the seventeenth resistor R17 is grounded. The other end of the eighteenth resistor R18 is electrically connected to the output of the second operational amplifier OPA2. The fourth capacitor C4 is connected in parallel with the eighteenth resistor R18. The anode of the receiving diode D3 is electrically connected to the non-inverting input of the second operational amplifier OPA2, and the cathode of the receiving diode D3 is electrically connected to the inverting input of the second operational amplifier OPA2. One end of the nineteenth resistor R19 is electrically connected to the output of the second operational amplifier OPA2, and the other end of the nineteenth resistor R19 is electrically connected to one end of the fifth capacitor C5. The other end of the fifth capacitor C5 is grounded.

[0052] In this embodiment, the receiving diode D3 can be placed inside a shield.

[0053] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0054] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0055] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A composite detection system for domestic kitchen fires, characterised in that, The system includes: The signal acquisition device includes a temperature sensor, a humidity sensor, a catalytic combustion gas sensor, and a dual-band smoke detector. The temperature sensor is used to acquire the temperature signal of the home kitchen, the humidity sensor is used to acquire the humidity signal of the home kitchen, the catalytic combustion gas sensor is used to acquire the gas concentration signal of the home kitchen, and the dual-band smoke detector is used to acquire the smoke concentration signal of the home kitchen. The signal processing and control device is electrically connected to the temperature sensor, humidity sensor, catalytic combustion gas sensor and dual-band smoke detector, respectively, and is used to perform threshold judgment on the temperature signal, humidity signal, gas concentration signal and smoke concentration signal to determine whether a fire has occurred in the family kitchen, and generate an alarm command when a fire occurs; An alarm device is wirelessly connected to the signal processing and control device and is used to receive and execute the alarm command. Before performing a threshold judgment on the gas concentration, the signal processing control device performs a moving average filtering process on the gas concentration signal, specifically for: Set up a first queue buffer and a second queue buffer with fixed lengths; When a new sample value is input into the first queue buffer, the tail data of the first queue buffer is removed, and the mean of all sample values ​​in the first queue buffer at this time is output to the second queue buffer. When the mean of the new sampled value is input into the second queue buffer, the tail data of the second queue buffer is removed, and the mean of all data in the second queue buffer at this time is used as the filtered gas concentration output. The smoke concentration signal includes red light sampling AD values ​​and blue light sampling AD values. When the signal processing control device performs threshold judgment on the smoke concentration signal, it is specifically used for: The red light sampling AD value and the blue light sampling AD value are genetically encoded using binary encoding to generate a coding population, where the high eight bits represent the red light threshold and the low eight bits represent the blue light threshold. The fitness values represented by the genotypes of all individuals in the coding population are calculated by a fitness function, wherein the fitness function is , , represents the red light sampling AD value, represents the blue light sampling AD value; The individual genotypes are screened using a roulette wheel algorithm, randomly selecting certain genes for elimination, where the probability of elimination is... , This represents the fitness value associated with the individual's genotype. This indicates the number of individual genotypes in the coded population; Single-point criterion inheritance was performed on the genotypes of the selected individuals; The threshold for smoke concentration was obtained through gene mutation.

2. The composite detection system according to claim 1, characterized in that, The catalytic combustion gas sensor includes: a detection element, a compensation element, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, and a first operational amplifier; One end of the detection element and the compensation element are connected to one end of the third resistor. The other end of the detection element is grounded. The other end of the compensation element is electrically connected to a preset power supply. One end of the first resistor and the second resistor are connected to the non-inverting input of the first operational amplifier. The other end of the first resistor is electrically connected to the preset power supply. The other end of the second resistor is grounded. The other end of the third resistor is electrically connected to the inverting input of the first operational amplifier. One end of the fourth resistor is electrically connected to the inverting input of the first operational amplifier. The other end of the fourth resistor is electrically connected to the output of the first operational amplifier. The fifth resistor and the first capacitor are connected in series. The other end of the fifth resistor is electrically connected to the output of the first operational amplifier. The other end of the first capacitor is grounded.

3. The composite detection system according to claim 1, characterized in that, The alarm device includes: A wireless signal transmission module is wirelessly connected to the signal processing and control device for transmitting the alarm command; The audible and visual alarm module is electrically connected to the wireless signal transmission module and is used to issue a first audible and visual alarm signal according to the alarm command.

4. The composite detection system according to claim 2, characterized in that, The system is battery powered, and the system also includes: A battery monitoring device, electrically connected to the signal processing and control device, is used to monitor the state parameters of the battery; The signal processing control device is further configured to control the audible and visual alarm module to issue a second audible and visual alarm signal when the battery is determined to be undervoltage based on the state parameters.

5. The composite detection system according to claim 2, characterized in that, The audible and visual alarm module includes: a first transistor, a sixth resistor, a seventh resistor, an inductor, and a buzzer; The base of the first transistor is electrically connected to the wireless signal transmission module through the sixth resistor. The collector of the first transistor is electrically connected to the first end of the inductor. The emitter of the first transistor is grounded. The first end of the seventh resistor is connected to the base of the first transistor. The second end of the seventh resistor is grounded. One end of the buzzer is electrically connected to the second end of the inductor. The other end of the buzzer is electrically connected to the third end of the inductor. The second end of the inductor is electrically connected to a preset power supply.

6. The composite detection system according to claim 1, characterized in that, The dual-band smoke detector includes: a blue light-emitting diode driving circuit, a red light-emitting diode driving circuit, and a light-emitting diode receiving circuit.

7. The composite detection system according to claim 6, characterized in that, The blue LED driving circuit includes: an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a second transistor, a first chip, a first LED, and a second capacitor. The base of the second transistor is electrically connected to the signal processing control device through the eighth resistor. The collector of the second transistor is electrically connected to the third pin of the first chip through the ninth resistor. The emitter of the second transistor is grounded. One end of the tenth resistor is electrically connected to the base of the second transistor, and the other end of the tenth resistor is grounded. The first pin of the first chip is electrically connected to the collector of the second transistor. The second and third pins of the first chip are connected. The fifth and sixth pins of the first chip are connected. A preset power supply is electrically connected to the anode of the first LED. The cathode of the first LED is electrically connected to the fourth pin of the first chip. One end of the eleventh resistor is electrically connected to the preset power supply, and the other end of the eleventh resistor is electrically connected to the sixth pin of the first chip. The positive terminal of the second capacitor is electrically connected to the preset power supply, and the negative terminal of the second capacitor is grounded. The red LED driving circuit includes: a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a third transistor, a second chip, and a second LED. The base of the third transistor is electrically connected to the signal processing control device through the twelfth resistor. The collector of the third transistor is electrically connected to the third pin of the second chip through the thirteenth resistor. The emitter of the third transistor is grounded. One end of the fourteenth resistor is electrically connected to the base of the third transistor, and the other end of the fourteenth resistor is grounded. The first pin of the second chip is electrically connected to the collector of the third transistor. The second and third pins of the second chip are connected. The fifth and sixth pins of the second chip are connected. A preset power supply is electrically connected to the anode of the second LED. The cathode of the second LED is electrically connected to the fourth pin of the second chip. One end of the fifteenth resistor is electrically connected to the preset power supply, and the other end of the fifteenth resistor is electrically connected to the sixth pin of the second chip.

8. The composite detection system according to claim 6, characterized in that, The LED receiving circuit includes: a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a receiving diode, a third capacitor, a fourth capacitor, a fifth capacitor, and a second operational amplifier; one end of the sixteenth resistor is electrically connected to the non-inverting input terminal of the second operational amplifier, and one end of the sixteenth resistor is grounded; the third capacitor is connected in parallel with the sixteenth resistor; one end of the seventeenth resistor and one end of the eighteenth resistor are shared with the inverting input terminal of the second operational amplifier, and the other end of the seventeenth resistor is grounded; the other end of the eighteenth resistor is electrically connected to the output terminal of the second operational amplifier; the fourth capacitor is connected in parallel with the eighteenth resistor; the anode of the receiving diode is electrically connected to the non-inverting input terminal of the second operational amplifier, and the cathode of the receiving diode is electrically connected to the inverting input terminal of the second operational amplifier; one end of the nineteenth resistor is electrically connected to the output terminal of the second operational amplifier, and the other end of the nineteenth resistor is electrically connected to one end of the fifth capacitor, and the other end of the fifth capacitor is grounded.

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