Commercial gas stove combustion control method, device and system and commercial gas stove

Abstract

The invention provides a combustion control method for a commercial gas stove. The combustion control method comprises the following steps: acquiring post-combustion gas component data acquired by a gas component sensor; gas component data obtained after combustion serve as feedback quantity, the error between the feedback quantity and a preset expected value is calculated, combustion control parameters are calculated through a closed-loop control algorithm on the basis of the error, and the combustion control parameters comprise the opening degree of a main fire gas valve and / or the rotating speed of a first draught fan; and the air supply amount and / or the air supply amount of the main fire combustor are / is adjusted according to the combustion control parameters. The invention further provides a combustion control device and system for the commercial gas stove and the commercial gas stove. According to the invention, the mixing ratio of the air and the fuel gas is adaptively adjusted by detecting the gas component data after combustion and combining a closed-loop control algorithm, so that the combustion efficiency is optimized.

Description

Technical Field

[0001] The present invention belongs to the technical field of commercial gas stove control, and in particular relates to a combustion control method, device, system and commercial gas stove for a commercial gas stove. Background Art

[0002] Commercial gas stoves are core equipment in commercial places such as hotels, restaurants, and canteens. Their performance and efficiency directly affect the operating costs and environmental benefits of catering companies. However, most commercial gas stoves currently require manual on-site debugging, but manual debugging is not only difficult, but also has low debugging accuracy. Due to regional differences in gas (including pressure differences and gas composition differences), even if it is debugged to the best state at the manufacturer, it may not work properly after the user installs it. This leads to the fact that after the commercial gas stove is sold and installed, almost every gas stove requires experienced engineers to go to the place of use for on-site debugging. The basis of manual debugging is based on a fixed-speed fan, which is coordinated with a mechanical damper and a gas valve to adjust the firepower. During the debugging process, engineers manually adjust the mechanical damper and gas valve through sensory observation (for example, flame color) and experience, trying to achieve the best combustion state for each gear. However, this adjustment method not only relies on the experience of the debugger, but also has low debugging accuracy and is difficult to debug. In addition, since engineers need to observe the flame state during the debugging process, no pots are usually placed on the furnace. But in fact, when commercial gas is used normally, pots and pans must be placed on the furnace. After the pots and pans are placed, the furnace changes from an open structure to a relatively closed space, and the combustion conditions change significantly. The originally optimized combustion state becomes no longer applicable after the pots and pans are placed.

[0003] The actual use environment of commercial gas stoves has the characteristics of dynamic changes. For example, due to the differences in the composition of natural gas, liquefied gas and artificial coal gas, there are significant differences in combustion performance; for example, the oxygen content in the air changes due to the environment (air quality, altitude), which will also affect the combustion efficiency. Therefore, even if the engineer adjusts it on site, it cannot guarantee that the commercial gas stove will always be in a complete combustion state during actual use.

[0004] In addition, the existing commercial gas stoves cannot respond to the dynamically changing usage environment, which will lead to unstable combustion and incomplete combustion. Incomplete combustion will lead to the following phenomena: incomplete combustion of the long-open flame will lead to unstable ion detection and trigger flameout protection; the fan wind force is too strong, causing the flame to separate; the gas ratio is large, and gas accumulates in the furnace, which is prone to deflagration when ignited. Especially when using large stoves such as large pots and steamers, the flame combustion is difficult to monitor due to the relatively closed furnace, and the safety risk is further increased.

[0005] The Chinese patent application with the publication number CN106500138A discloses a gas stove and cookware control system with precise temperature control. By setting a temperature sensor at the bottom of the cookware and combining it with a PID unit set in the gas stove controller, a closed-loop control of the gas stove's firepower and the cookware's temperature is formed to achieve precise control of the cookware's temperature. However, this solution requires the use of a special cookware integrated with a high-temperature-resistant temperature sensor, and conventional cookware cannot be used, which limits the universality of the system. This system requires real-time connection and communication between the cookware and the gas stove, and also requires setting a preset cookware temperature in advance. During the use of the cookware, the temperature requirements change continuously, and there will also be frequent situations of leaving the stove, so the practicality is relatively low. Moreover, this solution only focuses on the cookware temperature, and adjusts the gas flux through the gas solenoid valve to make the cookware temperature close to the desired temperature. However, in fact, the firepower level setting of the gas stove can already meet the temperature control requirements during the cooking process, especially for Chinese cuisine. This way of blindly pursuing temperature control is difficult to achieve complete combustion and may also bring the above-mentioned safety hazards. Summary of the Invention

[0006] In view of this, the present invention proposes an intelligent combustion control method for commercial gas stoves. By detecting the gas component data after combustion and combining with a closed-loop control algorithm, the gas supply volume and / or air supply volume of the main burner are automatically controlled to adaptively adjust the mixing ratio of air and gas (referred to as "air-fuel ratio") and optimize the combustion efficiency. Further, the present invention also discloses a combustion control device, a system and a commercial gas stove adopting the above-mentioned commercial gas stove combustion control method.

[0007] The technical solution of the present invention includes the following aspects:

[0008] In the first aspect of the present invention, a combustion control method for a commercial gas stove is provided. The commercial gas stove includes a furnace and a main burner arranged in the furnace. The method includes:

[0009] Obtain in real time the gas component data after combustion collected by a gas component sensor arranged in the flue. The gas component data is used to characterize the concentration of the target gas in the gas component after combustion. The flue is connected to the furnace;

[0010] Take the gas component data after combustion as a feedback quantity, calculate the error between the feedback quantity and a preset expected value, and calculate combustion control parameters based on the error through a closed-loop control algorithm. The combustion control parameters include the opening degree of the main gas valve and / or the rotational speed of the first blower;

[0011] Adjust the gas supply volume and / or air supply volume of the main burner according to the combustion control parameters.

[0012] As an optional solution, it further includes:

[0013] Based on the gas component data, judge the current combustion state according to a preset condition:

[0014] If it is determined that the state is not complete combustion, the gas component data after combustion is used as the feedback quantity, the error between the feedback quantity and the preset expected value is calculated, and based on the error, the combustion control parameters are calculated through a closed-loop control algorithm, and the gas supply volume and / or air supply volume of the main burner is adjusted according to the combustion control parameters.

[0015] Repeating the above process can achieve complete combustion. If it is determined that the state is complete combustion, the combustion control parameters corresponding to the current firepower level are stored or corrected.

[0016] As an alternative, the preset condition includes: when the target gas concentration is within the preset range, it is determined that the state is complete combustion; otherwise, it is determined that the state is not complete combustion.

[0017] As an alternative, the target gas is any one of oxygen, carbon monoxide, carbon dioxide, and nitrogen oxides; the gas sensor is any one of an oxygen sensor, a carbon monoxide sensor, a carbon dioxide sensor, and a nitrogen oxide sensor.

[0018] As an alternative, the closed-loop control algorithm is a PID control algorithm. The PID control algorithm has at least one of the following control modes: fixed air volume to adjust gas volume, configured to fix the rotation speed of the first fan and adjust the gas supply volume by calculating the opening degree of the main burner gas valve; fixed gas volume to adjust air volume, configured to fix the opening degree of the main burner gas valve and adjust the air supply volume by calculating the rotation speed of the first fan; fixed power to adjust both volumes, configured to fix the power of the commercial gas stove and adjust the gas supply volume and air supply volume simultaneously by calculating the opening degree of the main burner gas valve and the rotation speed of the first fan respectively.

[0019] As an alternative, it further includes: receiving a firepower level signal; setting the opening degree of the main burner gas valve and the rotation speed of the first fan corresponding to this firepower level according to the initial parameter mapping relationship; the initial parameter mapping relationship is a one-to-one correspondence between the pre-stored firepower level, the opening degree of the main burner gas valve, and the rotation speed of the first fan.

[0020] As an alternative, it further includes: if the target gas concentration in the gas components after combustion is instantaneously greater than the first set value, it is determined that the current cookware has left the stove, and the main burner is controlled to close, and only the pilot burner remains running.

[0021] As an alternative, it further includes: in the state where the cookware has left the stove, if the target gas concentration in the gas components after combustion is instantaneously less than the second set value, it is determined that the current cookware has returned to the stove; the combustion control parameters are restored to the state before the cookware left the stove, and the opening degree of the main burner gas valve and / or the rotation speed of the first fan are adjusted according to the combustion control parameters.

[0022] As an alternative, it further includes: receiving a one-key adaptive instruction; sequentially switching and running each firepower gear in a specified order;

[0023] When each firepower gear is in a complete combustion state and reaches a preset duration, store or correct the combustion control parameters corresponding to each firepower gear.

[0024] As an alternative, it further includes: after the adaptation is completed, forming a set of specific parameter mapping relationships associated with specific usage conditions; the specific usage conditions refer to having one or more characteristic options that affect the air-fuel ratio, and the characteristic options include gas type, gas composition, cookware characteristics, burner structure, and usage environment.

[0025] As an alternative, it further includes: receiving a specific usage condition operation instruction; calling the specific parameter mapping relationship corresponding to the specific usage condition; controlling the opening degree of the main fire gas valve and the rotation speed of the first blower according to the specific parameter mapping relationship.

[0026] The second aspect of the present invention discloses a combustion control device for a commercial gas stove, including an MCU and an electromagnetic valve controller, a signal preprocessing module, and a power module electrically connected to the MCU; the signal preprocessing module is configured to: also be electrically connected to a gas composition sensor, preprocess the combustion gas composition data collected by the gas composition sensor and output it to the MCU, and the gas composition data is used to characterize the concentration of the target gas in the combustion gas composition, and the flue is connected to the furnace; the MCU is configured to: use the preprocessed combustion gas composition data as a feedback quantity, calculate the error between the feedback quantity and the preset expected value, and calculate the combustion control parameters based on the error through a closed-loop control algorithm, and the combustion control parameters include the opening degree of the main fire gas valve and / or the rotation speed of the first blower; according to the combustion control parameters, control the opening degree of the main fire gas valve electrically connected thereto through the electromagnetic valve controller, and control the rotation speed of the first blower electrically connected thereto through the blower controller.

[0027] As an alternative, the power module is configured to: convert the input power supply into a 36V low-voltage power supply and supply power to the MCU.

[0028] As an alternative, it further includes a blower controller electrically connected to the MCU, and the MCU controls the rotation speed of the first blower through the blower controller.

[0029] As an alternative, it further includes a communication module electrically connected to the MCU for communication connection between the MCU and the upper computer and / or the mobile terminal.

[0030] As an alternative, it further includes an alarm module electrically connected to the MCU.

[0031] The third aspect of the present invention discloses a combustion control system for a commercial gas stove, including a gas composition sensor and the commercial gas stove combustion control device described in the second aspect of the present invention or any one of its alternative embodiments; the gas composition sensor is installed in a flue communicating with the furnace for collecting data on the gas composition after combustion.

[0032] As an alternative embodiment, the signal acquisition unit further includes a combustible gas sensor and / or a flow meter; the MCU is further configured to: judge the gas leakage situation according to the gas concentration data collected by the combustible gas sensor, and control the main burner and the pilot burner to stop operating when gas leakage is judged; and / or, count the gas consumption through the flow meter.

[0033] The fourth aspect of the present invention discloses a commercial gas stove, including a furnace, a main burner and a pilot burner arranged in the furnace, a main gas valve and a pilot gas valve electrically connected to a solenoid valve controller, a first blower electrically connected to a blower controller, and the commercial gas stove combustion control system described in the third aspect of the present invention and any one of its alternative embodiments; the first blower is a variable frequency blower with speed feedback; the main gas valve is an adjustable electric valve.

[0034] As an alternative embodiment, it further includes a second blower electrically connected to the MCU; the first blower is used to supply air to the main burner, and the second blower is used to supply air to the pilot burner; the power of the second blower is less than that of the first blower.

[0035] As an alternative embodiment, it further includes a flue; the flue includes a horizontal section communicating with the furnace and a vertical section connecting the horizontal section; the gas composition sensor is installed in the middle and lower part of the vertical section of the flue.

[0036] The present invention can be widely applied to commercial places such as hotels, restaurants, and canteens, and is especially suitable for complex kitchen environments with multiple cookware and multiple gas types, and has the following beneficial effects:

[0037] (1) By detecting the gas composition data after combustion in real time and combining with a closed-loop control algorithm, the present invention uses the gas composition after combustion as feedback data to adaptively and dynamically adjust the combustion control parameters, continuously optimizes the air-fuel ratio through closed-loop control, and realizes complete combustion. This way of the present invention can not only completely solve the limitation of the existing gas stoves relying on manual adjustment, but also significantly improve the combustion efficiency, reduce energy consumption, reduce harmful gas emissions, and ensure the safe operation of the equipment.

[0038] (2) The present invention can perform one-key adaptive adjustment according to different usage conditions (gas type, gas composition, cookware characteristics, burner structure, usage environment, etc.), and obtain the corresponding specific parameter mapping relationship in this scenario to adapt to the intelligent switching of different usage conditions such as different gas types and cookware characteristics. It can improve the operating efficiency of the combustion control system, reduce the computational workload, and also lower the hardware cost.

[0039] (3) The present invention can also automatically detect the usage status of the cookware and set the corresponding operations in the energy-saving mode for the situation where the cookware is removed from the stove during use. On the one hand, it reduces energy consumption, and at the same time, it can also enhance the safety of using the gas stove.

[0040] (4) The present invention preferably adopts the PID control algorithm and gives three PID closed-loop control methods, which can be selected and set according to actual usage conditions and requirements, increasing the flexibility of use. Moreover, through PID control, it can also support rapid firepower switching, smooth adjustment of valve opening and fan speed, making the firepower conversion gentle and stable, avoiding deflagration phenomena caused by sudden changes in the air-gas ratio, ensuring the safety and stability of the combustion process, and can also significantly improve the user experience and meet the high-frequency usage requirements of the catering industry.

[0041] (5) The commercially used gas stove combustion control device innovatively proposed by the present invention can be adapted to most existing combustion systems or commercially used gas stoves, and can improve the combustion performance of the commercially used gas stove in the most cost-effective and convenient way. Moreover, this device can also integrate functions such as ignition, ion flameout protection, gas leakage detection, and alarm at the same time, ensuring the safety and reliability of the combustion process. Description of the Drawings

[0042] Figure 1 Schematic diagram of the circuit connection of the commercially used gas stove described in Embodiment 1;

[0043] Figure 2 Block diagram of the circuit connection of the commercially used gas stove described in Embodiment 1;

[0044] Figure 3 Partial sectional view of the commercially used gas stove described in Embodiment 1;

[0045] Figure 4 Schematic diagram of the flow of the combustion control method described in Embodiment 2;

[0046] Figure 5 Schematic diagram of the flow of the combustion control method described in Embodiment 3;

[0047] Figure 6 PID control schematic diagram for adjusting air volume at a fixed gas volume;

[0048] Figure 7 PID control schematic diagram for adjusting gas volume at a fixed air volume;

[0049] Figure 8 Schematic diagram of PID control for adjusting two variables at a fixed power

[0050] Annotation of the attached figure: 100 - furnace, 101 - main burner, 102 - pilot burner, 103 - premixing chamber, 104 - fan, 105 - power switch, 106 - start switch, 107 - main gas solenoid valve (referred to as "main valve" for short), 108 - fire power adjustment switch, 109 - ignition needle, 110 - main gas electromagnetic adjustable electric valve (referred to as "main fire adjustable electric valve" for short), 111 - pilot gas solenoid valve, 112 - flameout sensor, 113 - main shut-off valve; 200 - control circuit board, 201 - MCU, 202 - solenoid valve controller, 203 - signal preprocessing module, 204 - power module, 205 - communication module, 206 - fan controller; 301 - gas composition sensor, 302 - combustible gas sensor, 303 - flow meter; 400 - display screen; 500 - flue. Specific implementation mode

[0051] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments and the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0052] In the description of the present invention, if terms indicating orientation or position relationship such as "upper", "lower", "front", "rear", "inner", "outer", etc. appear, they are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation of the present invention. In addition, if terms such as "first", "second", etc. appear, they are used to distinguish similar objects and do not have to be used to describe a specific order or relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in combination with specific situations. In addition, the terms "include" and "have" and any of their deformations are intended to cover non-exclusive inclusion, that is, they may include other units that are not clearly listed or are inherent to these products or devices.

[0053] Embodiment 1 of the present invention provides a commercial gas stove, which mainly includes a combustion system and a combustion control system. The combustion control system can directly apply the traditional commercial gas stove, and through the gas composition sensor therein, cooperate with the closed-loop control algorithm built in the MCU to realize the closed-loop control of the air-fuel ratio of the combustion system.

[0054] As Figure 1As shown, the combustion system mainly includes a furnace chamber 100, a main fire burner 101, a pilot burner 102, a premixing chamber 103, a blower 104, a power switch 105, a start switch 106, a main gas solenoid valve 107, a fire power adjustment switch 108, an ignition pin 109, a main fire gas electromagnetic adjustable electric valve 110, a pilot gas solenoid valve 111, a flameout inductor 112 and other components, as well as relevant pipeline arrangements such as a gas inlet pipeline, a mixed gas supply pipeline and a ventilation pipeline.

[0055] Among them, the furnace chamber 100 is the combustion area for the mixed gas (the gas after mixing gas and air), and is also used for placing cookware. The main fire burner 101 and the pilot burner 102 are both arranged in the furnace chamber 100. Among them, the main fire burner 101 is the main combustion component of the combustion system, undertaking the main heat output. The pilot burner 102 is used to ignite the flame of the main fire burner 101 and provide a continuous combustion state at low load. The ignition pin 109 is arranged in the furnace chamber 100 and near the pilot burner 102, and is used to provide the electric spark required for gas ignition to the pilot burner 102. The premixing chamber 103 is the area where gas and air are mixed before entering the furnace chamber 100. In the premixing chamber 103, the two gases are mixed in proportion to ensure more sufficient and stable combustion. The premixing chamber 103 is usually located at the bottom of the gas stove, and gas and air are introduced through the gas inlet pipeline and the ventilation pipeline, and the gas formed by mixing gas and air (referred to as "mixed gas") is provided to the furnace chamber 100 through the mixed gas supply pipeline. The blower 104 is connected to the ventilation pipeline, mainly used to provide the air required for combustion, and the air volume delivered by the blower 104 can be controlled by adjusting the rotation speed. The blower 104 is a variable frequency blower with a rotation speed feedback function. In an alternative solution, a DC brushless variable frequency blower can be selected. The present invention optimizes the air-fuel ratio (i.e., the mixing ratio of air and gas) through the cooperation of the rotation speed adjustment of the blower 104 and the opening degree adjustment of the main fire gas electromagnetic adjustable electric valve 110 to achieve efficient combustion. The power switch 105 provides power control for the entire system. The start switch 106 is the main switch for starting the gas kitchenware, triggering the ignition process. The fire power adjustment switch 108 is the interface for the user to control the fire power size, and has multiple fire power gears adjustable.

[0056] Among them, the gas inlet pipeline mainly consists of a main pipe, a main branch pipe and a secondary branch pipe branched from the main pipe. One end of the main branch pipe and the secondary branch pipe is connected to the main pipe, and the other end is connected to the premixing chamber 103 and the pilot burner 102 respectively. The main gas solenoid valve (abbreviated as "main valve") 107 is arranged on the main pipe to control the total gas supply channel and cut off the gas flow in case of failure or flameout. The main fire gas electromagnetic adjustable electric valve (abbreviated as "main fire adjustable electric valve") 110 is arranged on the main branch pipe to adjust the gas flow according to the control signal and cooperate with the adjustment of the fan speed to realize the dynamic adjustment of the air-fuel ratio. For example, a proportional adjustment valve can be selected. The pilot gas solenoid valve (abbreviated as "pilot valve") 111 is arranged on the secondary branch pipe to control the gas supply of the pilot flame and maintain the combustion state of the pilot flame. The inlet end of the main pipe is connected to the combustible gas source through a main stop valve 113 (for example, a manual ball valve) to access the fuel required for the operation of the gas stove. The fuel can be combustible gases such as natural gas, liquefied gas or artificial gas (abbreviated as "gas").

[0057] Among them, the ignition needle 109 is arranged in the furnace 100 near the pilot burner 102 as a flameout protection device to detect the flame state and trigger the protection mechanism to cut off the gas and give an alarm in case of flameout. In an alternative solution, the flameout protection device can be an ion protection needle, which detects the ion current in the flame through the ion protection needle to monitor the combustion state in real time. During the operation of the combustion system, the combustion state is monitored in real time through the ignition needle 109. If the flame is detected to be extinguished, the gas valve is immediately closed and an alarm is issued. In an alternative solution, the flameout protection device is an ion protection needle, and the ion protection needle monitors the flame state in real time and feeds back the detected current signal to the combustion control system. Once the current signal is interrupted, it is judged as accidental flameout, and the following protection actions can be immediately executed: closing the main fire adjustable electric valve 110 and the pilot valve 111, and triggering the alarm module to prompt the user of the fault state. At the same time, the fault information is recorded for subsequent inspection and maintenance.

[0058] It should be noted that in a preferred solution, the fans in the combustion system of the commercial gas stove can be divided into two types: high-power fans and low-power fans. The high-power fans mainly work in the combustion operation state to supply air for the main fire combustion; the low-power fans supply air for the pilot flame combustion. The high-power fans and the low-power fans are electrically connected to the main control board through the fan controller 206. Further, the low-power fans can be fixed-power fans matching the air volume required for the pilot flame. The high-power fans are variable-frequency fans with speed feedback. Through this dual-fan setting, the problem of energy consumption loss caused by excessive fan power during the combustion of the pilot flame can be effectively avoided.

[0059] The combustion control system is mainly composed of a signal acquisition unit and a main control board. Among them, the signal acquisition unit mainly includes a gas composition sensor 301. The gas composition sensor 301 is used to detect changes in gas composition after combustion, especially the concentration of oxygen and / or carbon monoxide, and convert the concentration change into a corresponding voltage signal and input it to the main control board. The gas composition sensor 301 is set inside the flue 500, so it needs to work in a high temperature environment of about 300 to 400°C, so it should have good high temperature resistance, and its maximum operating temperature is usually higher than the highest temperature inside the flue 500 during the actual combustion process to ensure its long-term stable operation.

[0060] In an optional solution, the gas composition sensor 301 is an oxygen sensor, which is mainly used to measure the oxygen concentration in the gas after combustion, and the monitoring range is usually 0%-25%. For example, a solid electrolyte sensor such as a potential type zirconium oxide oxygen sensor, a limiting current type zirconium oxide oxygen sensor, etc. can be selected. This type of oxygen sensor can provide high-precision (ppm level) oxygen concentration monitoring, and is mainly composed of a sensing unit and a heating element. Its operating temperature is usually 300-800°C, and can reach up to 1000°C, which is very suitable for the high temperature environment in the flue. In other optional embodiments, a Nernst sensor based on the Nernst equation can also be selected.

[0061] In another optional solution, the gas composition sensor 301 is a carbon monoxide sensor, and the monitoring range is usually 0-1000ppm, which is mainly used to monitor the carbon monoxide concentration in the gas after the combustion, so as to avoid the carbon monoxide produced by incomplete combustion as much as possible, help to accurately adjust the combustion process, and reduce harmful gas emissions. These sensors are resistant to high temperatures and corrosion and can be well applied to combustion systems. For example, carbon monoxide sensors including zirconium oxide sensors, infrared absorption sensors, semiconductor sensors, etc. that can work in a high temperature environment of 300 to 400°C can be selected. In addition, the gas composition sensor 301 can also be a carbon dioxide sensor or a nitrogen oxide sensor, which will not be described in detail.

[0062] The gas component sensor 301 is usually installed in a closed flue for discharging the gas after the combustion system. The flue 500 usually includes interconnected horizontal and vertical sections (arranged perpendicular to the cooking range plane). One end of the horizontal section, i.e., the smoke inlet, is connected to the furnace 100, and the other end is connected to the vertical section; the flue gas discharged from the other end of the vertical section is usually collected by a smoke hood installed above the commercial gas stove and discharged through a pipe connected to the smoke hood. In an alternative solution, the flue 500 can be integrally formed with the commercial gas stove, i.e., as a component of the commercial gas stove. Looking from the outside, it is located on the side of the commercial gas stove. Preferably, the gas component sensor 301 is installed in the middle and lower part of the vertical section (i.e., the middle and below positions), which can ensure that the sensor is exposed to a relatively high temperature environment to meet the working requirements of the sensor. At the same time, it can also avoid installing the sensor in the horizontal section close to the direct injection of the flame, where there may be a risk of over-temperature damage to the sensor due to excessive temperature. Moreover, installing it in the vertical section can also reduce the influence of condensate water and avoid unstable air flow, thereby ensuring that the sensor can work stably and accurately collect data.

[0063] In other alternative solutions, the signal acquisition unit further includes a combustible gas sensor 302 installed near the furnace 100, which is used to detect the concentration of combustible gas near the furnace 100, convert the concentration signal into a corresponding voltage signal, and then transmit it to the main control board to monitor the gas leakage situation in real time. If it is detected that the gas concentration in the air exceeds the standard, the system will stop running. The combustible gas sensor 302 can be a commonly used semiconductor sensor.

[0064] In other alternative solutions, the signal acquisition unit further includes a flow meter 303 arranged at the downstream position of the main fire adjustable electric valve 110. The gas flow is monitored in real time through the flow meter 303 to ensure normal gas supply.

[0065] The main control board can be a newly designed circuit board or can be obtained by improving the main control board of an existing commercial gas stove. The main control board integrates an MCU (microcontroller) 201, which is the core of the control system. The STM32 series MCU of STMicroelectronics can be selected, which is mainly responsible for all signal processing, system execution, and decision-making logic. Based on the target gas concentration data collected by the gas component sensor and combined with the closed-loop control algorithm, closed-loop control is achieved, thereby optimizing the combustion efficiency and achieving complete combustion.

[0066] Combined Figure 2 As shown, in addition to the MCU 201, the main control board also integrates a solenoid valve controller 202, which is connected to the main valve 107, the main fire adjustable electric valve 110, and the pilot flame valve 111 through the solenoid valve controller 202. The solenoid valve controller 202 receives the instructions sent by the MCU 201 to control each valve respectively, and then adjusts the gas intake volume entering the pre-mixing chamber (furnace).

[0067] Further, the main control board also integrates a fan controller 206, which is electrically connected to the fan 104 through the fan controller 206 and is used to control the operation of the fan 104. In other alternative solutions, the fan controller 206 can also be directly integrated on the fan 104 and regarded as a whole with it.

[0068] The main control board also integrates a signal preprocessing module 203 and a power supply module 204. The signal preprocessing module 203 is connected to the signal acquisition unit and is used for processing such as amplification, filtering, and signal compensation of the input signal to achieve high-precision data acquisition of the sensing signal.

[0069] The power supply module 204 is mainly used to supply power to devices such as the MCU 201. Further, compared with traditional gas stoves, the present invention can also convert the input 220V power supply into a preset low-voltage state through the voltage conversion function of the power supply module 204. For example, it provides 36V power for the fan, 24V power for the solenoid valve, and 3.3V or 5V power for the MCU, ensuring that all components including the MCU 201 are in a low-voltage state, greatly improving the safety and reliability of the system.

[0070] In other alternative solutions, the main control board also integrates a communication module 205. The communication module 205 can specifically be a 4G / 5G module, a Bluetooth module, or have two or more communication methods at the same time. Through the communication module 205, the MCU 201 can be communicatively connected to a host computer, a mobile terminal such as a mobile phone or a tablet, or other terminal devices to achieve remote monitoring and parameter adjustment, as well as view the operating status and receive abnormal alarm information through a mobile phone App or an Internet of Things platform.

[0071] In other alternative solutions, the commercial gas stove also integrates a user interaction function, including a display screen 400 electrically connected to the main control board. The display screen 400 displays information such as the device status, combustion condition, and fault alarm in real time, facilitating on-site monitoring and parameter adjustment by the user. The display screen 400 preferably is a touch display screen with an interaction function.

[0072] In other alternative solutions, the commercial gas stove also is provided with an alarm module, and the alarm module is electrically connected to the main control board. When an abnormal combustion state occurs, on the one hand, the MCU 201 controls the system to stop running, and at the same time issues an alarm signal through the alarm module to prompt the user to take countermeasures. The alarm module can specifically be one or more of devices such as a buzzer and an LED alarm light.

[0073] The control system of a commercial gas stove realizes the full - process control of ignition start, combustion control, firepower adjustment, safety protection, and air - fuel ratio optimization through the main control board. The main operation methods include: First, the user turns on or off the total power supply of the commercial gas stove through the power switch 105; after being powered on, the main control board enters the standby state; the user presses the start switch 106 to send a start signal to the main control board. After receiving the start signal, the MCU201 of the main control board performs the following operations in sequence: Start the ignition needle 109 to generate an ignition electric spark; start the blower 104 to perform pre - blowing to remove residual gas and ensure a safe combustion environment; open the pilot - light valve 111, the main valve 107, and the main cut - off valve 113 through the solenoid valve controller 202. The gas enters the pilot - light burner 102 through the secondary branch pipeline to ignite the pilot - light, and maintains a small - fire state through the pilot - light to ensure that the outer flame can be quickly ignited. Start the ignition needle 109 and monitor the combustion state in real - time. Then the user can select the firepower level through the firepower adjustment switch 108; the MCU201 in the main control board views the pre - stored relationship table of level signal - valve opening - blower speed (i.e., the parameter mapping relationship table) according to the received firepower level signal, and adjusts the main - fire adjustable electric valve 110 to the corresponding opening to enable the gas of the corresponding flow rate to enter the pre - mixing chamber 103, and at this time the main fire (i.e., the outer flame) is ignited. At the same time, the MCU201 adjusts the blower 104 to the corresponding rotation speed through the blower speed controller 206 to match the appropriate air supply volume.

[0074] As Figure 3 shown, Embodiment 2 of the present invention discloses a commercial gas stove combustion control method, which can be applied to the commercial gas stove described in Embodiment 1, and mainly includes the following steps:

[0075] A1: Obtain the post - combustion gas composition data through the gas composition sensor 301 in the flue 500. The gas composition data can characterize the concentration of the target gas in the post - combustion gas. The target gas is the gas that the gas composition sensor 301 can detect, and can be any component in the post - combustion gas such as oxygen, carbon monoxide, carbon dioxide, nitrogen oxides, etc. In this embodiment, taking oxygen as an example, the gas composition sensor 301 used is an oxygen sensor. It can be understood that the oxygen sensor converts the detected oxygen concentration value into a corresponding voltage value and then outputs it. Therefore, the gas composition data obtained by the MCU201 is specifically the output voltage signal used to reflect the oxygen concentration. Further, the output voltage signal can also be first processed by the signal pre - processing module 203 integrated on the main control board, such as amplification, filtering, signal compensation, etc., and then transmitted to the MCU201 after denoising through the smoothing filtering algorithm to improve the accuracy of the feedback quantity.

[0076] A3: The MCU201 takes the output voltage signal as the feedback quantity, calculates the error between the feedback quantity and the preset expected value, and calculates and outputs the combustion control parameters through the PID controller built in the MCU.

[0077] A4: Adjust the gas supply and air supply of the main burner according to the combustion control parameters. Among them, the combustion control parameters mainly include the opening degree of the adjustable main electric valve 110 and the rotation speed of the blower 104.

[0078] It can be understood that the PID controller, as a classic closed-loop control controller, has a combination of proportional, integral, and derivative terms. The PID controller first calculates the error between the feedback value of the oxygen sensor, that is, the output voltage signal, and the pre-stored target value. If the current oxygen concentration is higher or lower than the target value, the proportional term will generate a correction signal proportional to the error to adjust the ratio of air to gas. The integral term corrects the long-term deviation of the system by accumulating past errors. If there is a small continuous error in the system for a long time (for example, a slight oxygen concentration deviation), the integral term will increase the correction effect to eliminate the steady-state error of the system. The derivative term generates a correction signal based on the rate of change of the error to suppress the overshoot of the system, helping the system to quickly reach the target state and reduce oscillations.

[0079] Specifically, the output of the PID controller can be expressed by the following formula:

[0080]

[0081] e(t) = r(t) - y(t);

[0082] In the formula, u(t) represents the control output, that is, the combustion control parameter; e(t) is the error, r(t) is the set value, that is, the target value; y(t) is the actual value, that is, the feedback value; K p is the proportional gain; K i is the integral gain; K d is the derivative gain.

[0083] It can be understood that the PID control algorithm is only the preferred embodiment of the present invention, and other closed-loop control algorithms such as PI and PD can also be used in other embodiments.

[0084] In combustion control technology, the air-fuel ratio refers to the mixing ratio of air to gas, also known as the air-fuel ratio (Air-Fuel Ratio, AFR), which is the core index for evaluating the combustion state. The theoretical optimum value of the air-fuel ratio (also known as the "theoretical air-fuel ratio") refers to the optimum ratio required for complete combustion of fuel and air. For example, for gasoline combustion, the theoretical air-fuel ratio is 14.7:1, and the oxygen concentration after combustion is close to 0%; for natural gas combustion, the theoretical air-fuel ratio is 17.2:1, and the oxygen concentration after combustion is also close to 0%.

[0085] For different combustion states, the combustion state can be judged by monitoring the components of the gas after combustion, and the air-fuel ratio can be adjusted. The combustion states specifically include the following: (1) In the complete combustion state, the oxygen in the air and the fuel in the gas react completely according to the theoretical optimal ratio or slightly greater than the theoretical optimal ratio, generating stable oxides, mainly carbon dioxide (CO2) and water (H2O). The current air-fuel ratio is the theoretical air-fuel ratio. In this state, there is no need to adjust the air-fuel ratio, and it can be maintained. (2) In the incomplete combustion state, the fuel and oxygen do not react sufficiently, generating some oxides and unburned products, including carbon monoxide, carbon particles (soot), and unburned hydrocarbons. This state indicates insufficient oxygen, and the air-fuel ratio is lower than the theoretical air-fuel ratio. The rotation speed of the blower 104 can be adjusted through the blower controller 206 to increase the air supply volume, so as to increase the oxygen supply during the combustion process, make the air-fuel ratio continuously approach the theoretical air-fuel ratio, and achieve complete combustion. (3) In the under-burning state, the oxygen supply is significantly insufficient, the fuel cannot burn sufficiently, and a large amount of carbon monoxide and unburned hydrocarbons are generated. In this state, the air-fuel ratio is much lower than the theoretical optimal value. In this state, on the one hand, the rotation speed of the blower 104 can be adjusted through the blower controller 206 to increase the air intake volume, so as to increase the oxygen supply during the combustion process; on the other hand, the opening degree of the main fire adjustable electric valve 110 can be adjusted to reduce the gas supply volume; or the rotation speed of the blower 104 and the gas supply volume can be adjusted simultaneously, so that the air-fuel ratio continuously approaches the theoretical air-fuel ratio and complete combustion is achieved. (4) In the over-burning state, the oxygen supply volume far exceeds the amount required for complete fuel combustion, and nitrogen oxides may be generated. In this state, the air-fuel ratio is much higher than the theoretical optimal ratio. The rotation speed of the blower 104 can be adjusted through the blower controller 206 to reduce the air intake volume and lower the oxygen supply during the combustion process; or the opening degree of the main fire adjustable electric valve 110 can be adjusted to increase the gas supply volume; or the rotation speed of the blower 104 and the gas supply volume can be adjusted simultaneously, so that the air-fuel ratio continuously approaches the theoretical air-fuel ratio and complete combustion is achieved.

[0086] The present invention can quantify the gas supply volume and the air supply volume by digital methods, and digitally represent the fire power, gas supply volume, and air supply volume through the corresponding fire power gears, valve opening degrees, and blower rotation speeds. For example, the fire power gears, air supply volume, gas supply volume, and power are all divided into 5 gears, and each fire power gear forms a corresponding relationship with the corresponding air supply volume gear, gas supply volume gear, and power gear. It can be understood that in actual applications, the division of each parameter gear and the corresponding relationship between them can be adjusted according to the actual situation.

[0087] Furthermore, to achieve precise control of the combustion state, the present invention provides three optional adjustment methods based on a PID controller:

[0088] Such as Figure 5, the first one is to adjust the air volume with a fixed gas volume. The fixed gas volume means fixing the opening degree of the main fire electromagnetic proportional valve 110, and evenly dividing the gas supply volume from slightly open to fully open into 5 gears with an interval of 20%. For each intake gear, the oxygen concentration in the combustion gas is detected by the gas composition sensor 301, and the rotation speed of the blower 104 is calculated and output by the PID controller, so as to provide an appropriate air supply volume to match the current gas supply volume. This method is especially suitable for scenarios where the gas volume is relatively fixed and the wind speed linearity is relatively good, and the combustion is optimized by adjusting the air supply volume.

[0089] For example, under the condition of the theoretical air-fuel ratio, the voltage output signal is 0.45V. If the actually measured feedback value is 0.3V, which is significantly lower than 0.45V, it indicates that the oxygen is excessive. The PID adjustment will respond by reducing the air volume to make the combustion sufficient. After adjustment, the feedback value is maintained near 0.45V. If the actually measured feedback value is 0.6V, which is higher than 0.45V%, it indicates that the oxygen is insufficient. The PID adjustment will respond by increasing the air volume to make the combustion sufficient. After adjustment, the feedback value is maintained at 0.45V and nearby.

[0090] Such as Figure 6 , the second one is to adjust the gas volume with a fixed air volume. The fixed air volume means fixing the rotation speed of the blower 104, and evenly dividing the air supply volume from low speed to high speed into 5 gears. For each air supply gear, the oxygen concentration in the combustion gas is detected by the gas composition sensor 301, and the opening degree of the main fire adjustable electric valve 110 is calculated and output by the built-in PID controller in the MCU201 to provide an appropriate gas supply volume to match the current air supply volume. This method is especially suitable for scenarios where the air supply volume is relatively fixed, and the combustion is optimized by adjusting the gas volume.

[0091] Such as Figure 7 , the third one is to adjust the two volumes with a fixed power, that is, according to the power demand of the cooker, evenly divide the power from zero to the maximum into 5 gears. At the same time, the rotation speed of the blower 104 and the opening degree of the main fire electromagnetic proportional valve 110 are respectively divided into 1 to 5 gears to realize one-to-one correspondence between the power gear, the air supply gear and the gas supply gear. For each gear, the oxygen concentration in the combustion gas is detected by the gas composition sensor 301, and the opening degree of the main fire adjustable electric valve 110 and the rotation speed of the blower 104 are calculated and output by the double-loop PID controller to realize the double adjustment of the air supply volume and the gas supply volume to quickly match the current power demand. This method is especially suitable for scenarios where the power demand changes dynamically, and the combustion is optimized by adjusting the air supply volume and the gas supply volume at the same time.

[0092] It can be understood that among the proportional, integral and differential terms in the PID controller, the proportional coefficient P is the most crucial and can be set between 0.2 and 0.3. The larger the value, the stronger the rigidity and the faster the change. The above three adjustments are all corrective adjustments within a limited range, and the maximum or minimum value after correction will not cross gears.

[0093] It can be seen that on the one hand, the MCU 201 can adjust the rotation speed of the blower 104 through the blower controller 206 to increase the air supply volume, so as to increase the oxygen supply during the combustion process; on the other hand, it can also adjust the opening degree of the main fire adjustable electric valve 110 to reduce the gas supply volume; or adjust the air supply volume and gas supply volume simultaneously, so that the air-fuel ratio continuously approaches or reaches the theoretical air-fuel ratio to achieve complete combustion.

[0094] It can be understood that during the use process, the PID controller continuously calculates and adjusts the combustion control parameters in order to achieve the theoretical air-fuel ratio. For example, the target value is set to 0.45V, and the feedback value must be 0.45V. If the first feedback value is measured to be 0.6V, the error = 0.6V - 0.45V = 0.15V. The error of 0.15V multiplied by the proportionality coefficient of 0.2 is equal to 0.03V. The PID adjustment amplitude this time is to decrease by 0.03V, that is, to control an increase in the air volume by 30 revolutions. After adjusting the air volume, the feedback value becomes 0.57V, and through calculation, the next adjustment amplitude is obtained as a decrease of 0.024V, that is, to control an increase in the air volume by 24 revolutions. In this mode, since it is difficult to reach the ideal state (theoretical air-fuel ratio), the feedback value usually fluctuates around 0.45V, and the PID controller needs to continuously calculate and adjust the combustion control parameters. In fact, in order to ensure complete combustion, slightly excessive air is usually provided, that is, the actual air-fuel ratio is slightly higher than the theoretical air-fuel ratio, and a certain amount of oxygen will remain in the combustion gas. Therefore, in practical applications, according to the requirements of the combustion system design and operating conditions, the oxygen concentration in the combustion gas is between 2% and 4% (including the end point values), and the carbon monoxide concentration is between 0 and 50 ppm (including the end point values), that is, when the detected target gas concentration is within the expected range, it is regarded as the complete combustion state. Correspondingly, the air-fuel ratio corresponding to the complete combustion state can be called the expected air-fuel ratio or the target air combustion ratio.

[0095] As Figure 4 shown, as an improvement, Embodiment 3 adds a combustion state judgment step A2 compared with Embodiment 2, that is, the MCU 201 judges the current combustion state based on the gas component data according to the preset conditions. If it is judged to be in the complete combustion state, directly store or correct the combustion control parameters corresponding to the current fire power level without further calculation; otherwise, enter step A3. That is to say, only when it is judged that it is not in the complete combustion state will the PID controller be started to work, which can significantly reduce the computing amount and energy consumption of the PID controller. Among them, the preset conditions are mainly related to the concentration range of the target gas. For example, if the output voltage signal is within 4.5V ± 5%, it can be considered to be in the complete combustion state, and the corresponding air-fuel ratio can be called the expected air-fuel ratio; if it exceeds 4.5V ± 5%, it is judged that it is not in the complete combustion state, which may be incomplete combustion, overburning or underburning, but no further subdivision is required.

[0096] For example, for oxygen detection, the voltage output signal corresponds to the oxygen concentration. In the preset conditions, if the voltage output signal is within 0.45V ± 5%, it is regarded as complete combustion, and the corresponding air-fuel ratio can be called the desired air-fuel ratio. If it exceeds 4.5V ± 5%, it is determined that the state is not complete combustion, which may be incomplete combustion, overburning or underburning. Generally, if the voltage output signal is lower than this range, it indicates that too much air enters the furnace 100 and is in an overburning state; if the voltage output signal is higher than this range, it indicates that too little air enters the furnace 100 and is usually in an incomplete combustion state or even an underburning state. The same applies to the detection of carbon monoxide or other gases. When the MCU 201 reaches the desired air-fuel ratio through the combustion parameters, the PID calculation process can be ended. For example, the target value is set to 0.45V, and it is considered that the feedback value within the range of 4.5V ± 5% is normal and no PID calculation is required. If the first feedback value is measured to be 0.6V, the error = 0.6V - 0.45V = 0.15V, and the error of 0.15V multiplied by the proportionality coefficient of 0.2 is equal to 0.03V. The PID adjustment amplitude this time is to decrease by 0.03V, that is, to control an increase in the air volume by 30 revolutions. After adjusting the air volume, the feedback value should become 0.57V, and through calculation, the next adjustment amplitude is to decrease by 0.024V, that is, to control an increase in the air volume by 24 revolutions. Until the feedback value is stable within 4.5V ± 5%, it is considered that the set of combustion control parameters is suitable for this firepower level, and the mapping relationship between the firepower level and the combustion control parameters is stored or updated.

[0097] It should be noted that based on the above method, the present invention abandons the traditional method that relies on manual sensory adjustment. Through the gas component sensor 301 installed in the flue 500, the gas component data after combustion (such as the concentration of gases such as oxygen and carbon monoxide) is detected in real time and fed back to the main control board. The main control board judges the combustion state according to the gas component data, and when it is not in the complete combustion state, starts the PID controller to calculate the combustion control parameters, controls the opening degree of the main fire electromagnetic proportional valve 110 through the solenoid valve controller 202, and controls the rotation speed of the blower 104 through the blower controller 206 to dynamically adjust the mixing ratio of air and gas to achieve precise control.

[0098] Generally, a set of initial parameter mapping relationships will be pre-stored in the MCU 201, that is, the one-to-one correspondence between each firepower level and the opening degree of the main fire adjustable electric valve 110 and the rotation speed of the adjusting blower 104. After ignition and receiving the firepower level signal, the MCU 201 calls the pre-stored initial parameter mapping relationship to view the valve opening degree and blower rotation speed corresponding to the firepower level. By controlling the main fire adjustable electric valve 110 to adjust the corresponding opening degree, the gas intake volume entering the pre-mixing chamber 103 is made to meet the requirements; by controlling the speed of the blower through the blower controller 206, the appropriate amount of air is supplemented into the pre-mixing chamber 103.

[0099] Furthermore, based on Embodiment 2 or 3, Embodiment 4 of the present invention provides an optional off-stove energy-saving mode. By analyzing the detection data of the gas composition sensor 301 to determine the state of the cookware, and performing appropriate gear adjustment based on the current cookware state, dynamic energy-saving control is achieved. Among them, the cookware state mainly includes two states: the cookware leaves the furnace 100 (abbreviated as "the cookware is off the stove") and the cookware is placed back in the furnace 100 (abbreviated as "the cookware is back on the stove"). This operation process includes common situations such as cookware cleaning and leaving the stove, and cookware switching. The specific process mainly includes two parts:

[0100] One is the cookware leaving the stove and automatic downshifting. When the cookware leaves the furnace 100, the furnace changes from a relatively enclosed space to an open structure. The internal exhaust smoke will significantly decrease, and at the same time, fresh external air enters, resulting in a significant increase in the oxygen content in the flue 500. For example, the output voltage signal of the oxygen sensor instantly approaches 0V, significantly deviating from the expected value of 0.45V, indicating that the gas composition after combustion is abnormal. The MCU 201 determines that the current state is the cookware off the stove, and then can control the main burner 101 to be turned off through the solenoid valve controller 202, and only keep the pilot burner 102 running, reducing gas consumption and ensuring safety in use.

[0101] The other is the cookware back on the stove and gear restoration. When the cookware is placed back on the furnace 100 again, the furnace returns from an open structure to a relatively enclosed space, the pressure inside the furnace increases, the flue gas entering the flue 500 significantly increases, and due to the shielding of the cookware, the oxygen content will significantly decrease. For example, the output voltage signal of the oxygen sensor at this time instantly exceeds 1V, significantly deviating from the expected value of 0.45V. The MCU 201 determines that the cookware has been placed back, and then can restore the combustion state through at least the following two methods: One is automatic restoration, that is, automatically restore to the operating gear before the cookware leaves the stove, that is, adjust the fan speed and valve opening to the state corresponding to this gear, or it can also be set to restore to the fire gear of 1. The other is manual activation, that is, the user can re-select the gear through the fire adjustment switch 108 to quickly activate the combustion program. It should be noted that those skilled in the art can understand that "instantly" herein refers to a very short time (for example, within 3 seconds), that is, a sudden change occurs.

[0102] It is understandable that the factors affecting the combustion state of a gas stove usually include usage environment factors such as the ambient environment and gas type. However, the applicant has found that during the actual use of commercial gas stoves, compared with usage environment factors such as gas type and ambient environment, relatively dynamic factors such as burner head type and cookware structure also have a very obvious impact on the combustion state. For example, common burner heads include atmospheric burner heads, rotary burner heads, straight burner heads, double-ring burner heads, energy-saving burner heads, commercial burner heads, etc. After the gas stove has been used for a period of time or the burner head has aged, the burner head may need to be replaced. Moreover, the cookware used will also change according to usage requirements, and it changes more frequently relative to the burner head. With different shapes, sizes, and materials of cookware, these will cause changes in combustion conditions such as the distance between the bottom of the pot and the burner head, the degree of furnace enclosure, and heat transfer efficiency, thereby affecting the combustion state. However, compared with the characteristics of frequent switching of different types of cookware in household gas stoves, the types and quantities of cookware used in commercial gas stoves are relatively fixed.

[0103] Therefore, based on Embodiment 2 or 3, Embodiment 5 of the present invention further provides a one-key self-adaptive function for initial debugging suitable for different usage conditions to adapt to the characteristics that the usage conditions of commercial gas stoves will change but the change frequency is relatively low. The MCU 201 receives a one-key self-adaptive instruction issued by the user; then sequentially switches and operates each firepower level in a specified order; when each firepower level is in a complete combustion state and reaches a preset duration, stores or corrects the combustion control parameters corresponding to each firepower level; after the self-adaptation is completed, a set of specific parameter mapping relationships is formed. When in the same subsequent usage environment, directly call this set of specific parameter mapping relationships to run.

[0104] Taking a newly purchased cookware as an example, an embodiment of the present invention proposes a one-key adaptive function for specific cookware that is frequently used. By storing the combustion parameters matching the cookware after adaptation, the computational load of the MCU 201 can be greatly reduced, the hardware usage cost can be lowered, and energy consumption can be saved. Specifically, for a certain specific cookware, after it is placed in the furnace 100, the one-key adaptive function is started. After receiving the one-key adaptive instruction, the MCU 201 will automatically adjust the gear signal in sequence (for example, from gear 1 to gear 5, and then back from gear 5 to gear 1). For each gear, within a preset combustion time (for example, 10 seconds), the MCU 201 receives in real time the data of the gas composition after combustion fed back by the gas composition sensor 301, and judges the current combustion state according to the preset conditions: if it is judged that the complete combustion state is reached and the duration reaches the preset duration, the combustion control parameters corresponding to the current fire power gear are recorded; if it is judged that the complete combustion state is not reached, the data of the gas composition after combustion is used as the feedback quantity and input into the pre-stored PID controller, and the combustion control parameters are calculated and output; then, according to the output combustion control parameters, the gas supply amount and air supply amount of the main burner are adjusted to continuously approach and reach the desired air-fuel ratio, so as to achieve complete combustion, and when the complete combustion state is reached and the duration reaches the preset duration, the combustion control parameters corresponding to the current fire power gear are recorded. By repeating the above process, after the adaptation is completed, the parameter data corresponding to each gear of the cookware can be obtained, and the specific parameter mapping relationship for the cookware can be obtained. When using this cookware subsequently, the MCU 201 can directly call the specific parameter mapping relationship corresponding to this cookware to control the operation of the combustion system, and real-time calculation and dynamic control can be dispensed with.

[0105] Based on the one-key adaptive function, under specific usage conditions (for example, a certain type of cookware), the MCU 201 can directly call the pre-stored specific parameter mapping relationship according to the gear signal, and adjust the opening degree of the control valve and the rotation speed of the blower. On the one hand, this can quickly enter the complete combustion state and reach the desired air-fuel ratio; on the other hand, it can also reduce the computational load of the MCU 201 in the main control board and lighten the load of the main control board.

[0106] Furthermore, considering that the gas composition may have slight differences over time, or the influence of cookware damage, aging, etc., on the basis of the one-key adaptive function, the parameter dynamic optimization function can still be started, and through the fine-tuning of the opening degree of the valve and the rotation speed of the blower, the air-fuel ratio is continuously close to the desired air-fuel ratio, and the complete combustion state is achieved.

[0107] In summary, the present invention combines a gas component sensor and a closed-loop control algorithm (e.g., PID control algorithm) to automatically optimize the air-fuel ratio, achieve intelligent combustion control, improve combustion efficiency, effectively reduce gas waste, and reduce emission pollution. Further, through combustion state judgment, off-stove energy-saving mode, and one-key adaptive function, the computational load and energy consumption of the MCU can be reduced, while the user experience can be improved. Moreover, the present invention can also ensure the stable and reliable operation of the device by integrating functions such as flameout protection, flow monitoring, and gas leakage detection; achieve good human-computer interaction with a touch screen connected to the main control board; and realize remote monitoring and real-time adjustment of the combustion state through the wireless communication function of the main control board and relevant application programs installed on the mobile terminal.

[0108] Finally, it should be noted that although the technical solutions of the present invention have been described above in combination with the accompanying drawings and embodiments, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and guiding, rather than restrictive. Under the inspiration of this specification, those of ordinary skill in the art can also make many forms without departing from the scope protected by the claims of the present invention, and all of these fall within the scope of protection of the present invention.

Claims

1. A combustion control method for a commercial gas stove, the commercial gas stove comprising a furnace and a main burner disposed in the furnace; characterized in that, Including: Obtaining in real time the post - combustion gas component data collected by a gas component sensor disposed in the flue, where the gas component data is used to characterize the concentration of a target gas in the post - combustion gas components, and the flue is in communication with the furnace; Taking the post - combustion gas component data as a feedback quantity, calculating the error between the feedback quantity and a preset expected value, and calculating combustion control parameters based on the error through a closed - loop control algorithm, where the combustion control parameters include the opening degree of the main - fire gas valve and / or the rotational speed of the first blower; Adjusting the gas supply volume and / or the air supply volume of the main - fire burner according to the combustion control parameters.

2. The combustion control method of the commercial gas stove according to claim 1, characterized in that, Also including: Based on the gas component data, judging the current combustion state according to preset conditions: If it is judged that the state is not a complete combustion state, taking the post - combustion gas component data as a feedback quantity, calculating the error between the feedback quantity and a preset expected value, calculating combustion control parameters based on the error through a closed - loop control algorithm, and adjusting the gas supply volume and / or the air supply volume of the main - fire burner according to the combustion control parameters.

3. The combustion control method of the commercial gas stove according to claim 2, characterized in that, The preset conditions include: when the concentration of the target gas is within a preset range, it is judged to be in a complete combustion state; otherwise, it is judged not to be in a complete combustion state.

4. The combustion control method of a commercial gas stove according to any one of claims 1 to 3, characterized in that, Also including: Receiving a fire - power gear signal; Setting the opening degree of the main - fire gas valve and the rotational speed of the first blower corresponding to the fire - power gear according to an initial parameter mapping relationship; The initial parameter mapping relationship is a one - to - one correspondence relationship of the fire - power gear, the opening degree of the main - fire gas valve, and the rotational speed of the first blower stored in advance.

5. The combustion control method of a commercial gas stove according to any one of claims 1 to 3, characterized in that, Also including: If the concentration of the target gas in the post - combustion gas components is instantaneously greater than a first set value, it is determined that the current cookware is off the stove; Controlling the main - fire burner to close, and only keeping the long - flame burner running.

6. The combustion control method of the commercial gas stove according to claim 5, characterized in that, Also including: In the state where the cookware is off the stove, if the concentration of the target gas in the post - combustion gas components is instantaneously less than a second set value, it is determined that the current cookware is back on the stove; Restoring the combustion control parameters to the state before the cookware was off the stove, and adjusting the opening degree of the main - fire gas valve and / or the rotational speed of the first blower according to the combustion control parameters.

7. The combustion control method of a commercial gas stove according to any one of claims 1 to 3, characterized in that, Also including: Receiving a one - key self - adaptation instruction; Sequentially switching and running each fire - power gear in a specified order; When each fire - power gear is in a complete combustion state and reaches a preset duration, storing or correcting the combustion control parameters corresponding to each fire - power gear.

8. The combustion control method of the commercial gas stove according to claim 7, characterized in that, Also including: After self - adaptation is completed, forming a specific parameter mapping relationship associated with specific usage conditions; the specific usage conditions have one or more characteristic options affecting the air - fuel ratio, and the characteristic options include gas type, gas composition, cookware characteristics, burner structure, and usage environment; And receiving a specific usage condition operation instruction; Invoking the specific parameter mapping relationship corresponding to the specific usage conditions; Controlling the opening degree of the main - fire gas valve and the rotational speed of the first blower according to the specific parameter mapping relationship.

9. The combustion control method of a commercial gas stove according to any one of claims 1 to 3, characterized in that, The closed - loop control algorithm is a PID control algorithm.

10. The combustion control method of the commercial gas stove according to claim 9, characterized in that, The PID control algorithm has at least one of the following control methods: Fixed air volume and adjusted gas volume, configured to fix the rotational speed of the first blower and realize the adjustment of the gas supply volume by calculating the opening degree of the main - fire gas valve; Fixed gas volume and adjusted air volume, configured to fix the opening degree of the main - fire gas valve and realize the adjustment of the air supply volume by calculating the rotational speed of the first blower; Constant power dual-flow regulation is configured to fix the power of a commercial gas stove and simultaneously adjust the gas supply volume and the air supply volume by separately calculating the opening degree of the main fire gas valve and the rotational speed of the first blower.

11. The combustion control method of the commercial gas stove according to any one of claims 1 to 3, characterized in that, The target gas is any one of oxygen, carbon monoxide, carbon dioxide, and nitrogen oxides; the gas sensor is any one of an oxygen sensor, a carbon monoxide sensor, a carbon dioxide sensor, and a nitrogen oxide sensor.

12. A combustion control device for a commercial gas stove, characterized in that, It includes an MCU, a solenoid valve controller, a signal preprocessing module, and a power supply module that are electrically connected to the MCU. The signal preprocessing module is configured to: also be electrically connected to the gas component sensor, preprocess the post-combustion gas component data collected by the gas component sensor and output it to the MCU. The gas component data is used to characterize the concentration of the target gas in the post-combustion gas components, and the flue is connected to the furnace chamber. The MCU is configured to: use the preprocessed post-combustion gas component data as a feedback quantity, calculate the error between the feedback quantity and the preset expected value, and calculate the combustion control parameters based on the error through a closed-loop control algorithm. The combustion control parameters include the opening degree of the main fire gas valve and / or the rotational speed of the first blower. According to the combustion control parameters, control the opening degree of the main fire gas valve electrically connected to it through the solenoid valve controller, and control the rotational speed of the first blower electrically connected to it through the blower controller.

13. The combustion control device for a commercial gas stove according to claim 12, wherein, It also includes a blower controller electrically connected to the MCU.

14. The combustion control device of a commercial gas stove according to claim 12 or 13, characterized in that, It also includes a communication module and / or an alarm module electrically connected to the MCU. The communication module is used for communication connection between the MCU and the upper computer and / or the mobile terminal.

15. A combustion control system for a commercial gas stove, characterized in that, It includes a gas component sensor and the commercial gas stove combustion control device according to any one of claims 12 to 14. The gas component sensor is installed in the flue connected to the furnace chamber and is used to collect post-combustion gas component data.

16. A commercial gas stove, comprising a furnace chamber, a main fire burner and a pilot burner arranged in the furnace chamber, a main fire gas valve and a pilot burner gas valve electrically connected to an electromagnetic valve controller, and a first blower electrically connected to a blower controller, characterized in that, It also includes the commercial gas stove combustion control system according to any one of claims 16 to 18; the first blower is a variable-frequency blower with rotational speed feedback; the main fire gas valve is an adjustable electric valve.

17. The commercial gas stove according to claim 16, characterized in that, It also includes a second blower electrically connected to the blower controller; the first blower is used to supply air to the main fire burner, and the second blower is used to supply air to the pilot burner. The power of the second blower is less than that of the first blower.

18. The commercial gas stove according to claim 16, characterized in that, It also includes a flue; the flue includes a horizontal section connected to the furnace chamber and a vertical section connected to the horizontal section; the gas component sensor is installed in the middle and lower part of the vertical section of the flue.

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