CN113819493A

CN113819493A - Intelligent gas stove and pot overflow control method

Info

Publication number: CN113819493A
Application number: CN202111056097.4A
Authority: CN
Inventors: 李明守
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-03-10
Filing date: 2017-03-10
Publication date: 2021-12-21
Also published as: CN106969386B; CN106969386A

Abstract

The invention belongs to the field of gas cookers, and particularly discloses an intelligent gas stove which comprises a burner, an electric control gas valve, a temperature sensor, a controller and a cooking program. The electric control gas valve is arranged in an air inlet pipeline of the burner and used for controlling the firepower of the burner, and the temperature sensor is assembled on the gas stove and used for detecting the temperature at the bottom of the pot. The cooking recipe is configured with a set value of the pot temperature and a time associated with the time. When the gas stove is used for cooking food, the controller obtains a cooking program corresponding to the cooked food, and in the cooking process, the controller operates the electric control gas valve to adjust the intensity of the flame of the burner according to the set value and the measured value of the temperature of the cooker in the cooking program, so that the measured value of the temperature of the cooker reaches the set value in the cooking program until the cooking program is executed. The gas stove is suitable for automatically cooking soup, rice, porridge and pancake, and automatically cooks food materials without user participation in the cooking process.

Description

Intelligent gas stove and pot overflow control method

Technical Field

The invention relates to a gas cooker, in particular to an intelligent gas cooker with a built-in controller for automatically cooking soup, rice, porridge, pancake and the like according to cooking programs, and belongs to the field of gas cookers.

Background

When the gas stove in the prior art is used for cooking dishes, soup, rice, porridge and the like, a user needs to control the firepower and cooking time of the gas stove on site and remotely to prevent the gas stove from overflowing and/or boiling. For hot frying, continuous stir-frying and firepower and time control are required, so that the field operation of a user is inevitably required, and automatic cooking cannot be realized; however, for cooking such as soup making, rice cooking, porridge cooking, pancake cooking, food material loading into a pot and ignition cooking, the operation of turning over in real time is not required, only the firepower and cooking time of a gas stove are required to be controlled, and automatic cooking is expected to be realized. The intelligent gas stove can automatically cook soup, cook rice, cook porridge and pancake without user participation during cooking and can be used for making delicious food with or without cooking skills.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides an intelligent gas stove which is internally provided with a controller, a temperature sensor, an electric control gas valve and a cooking program. When cooking food, the controller obtains the culinary art form that corresponds with by the culinary art food, and based on this culinary art form, the automatically controlled gas valve of controller manipulation adjusts the size of combustor fire power, and the food is cooked to the automation, does not need the user to participate in, and the user has or not culinary art skill, all can make delicious food.

The technical scheme of the invention is to provide an intelligent gas stove, which is characterized by comprising the following components:

a burner adapted to heat a pot for cooking food;

the temperature sensor is used for detecting the temperature of the pot;

the electric control gas valve mainly comprises a plug valve and a driving motor, wherein the driving motor is connected with a valve rod shaft of the plug valve, and the plug valve is arranged in an air inlet pipeline of the burner and used for controlling the firepower of the burner;

a controller adapted to acquire a cooking recipe corresponding to food to be cooked, the cooking recipe being configured with a set value of a pot temperature associated with time; in each control period, the controller acquires a set value of the temperature of the cooker from the cooking program by adopting an interpolation method, processes the set value based on the measured value of the temperature of the cooker detected by the temperature sensor and the set value of the temperature of the cooker, generates a control signal to operate the driving motor, changes the valve opening of the plug valve, adjusts the fire power of the burner, enables the measured value of the temperature of the cooker detected by the temperature sensor to reach the set value of the temperature of the cooker, and finishes the cooking of food until the cooking program is executed.

The intelligent gas stove is provided with a controller, a temperature sensor and an electric control gas valve. The controller acquires a cooking program corresponding to the food to be cooked. During cooking, the controller collects the measured value of the temperature of the cooker measured by the temperature sensor and obtains the set value of the temperature of the cooker from the cooking program, generates a control signal according to the set value and the measured value of the temperature of the cooker to control the driving motor to rotate, changes the opening degree of the plug valve, adjusts the firepower of the gas stove, enables the measured value of the temperature of the cooker to reach the set value of the temperature in the cooking program, and finishes cooking until the cooking program is executed. In the whole cooking process, the gas stove automatically cooks food without user participation.

In practical application, the present invention also has the following further preferable technical solutions.

Optionally, the cooking program is further configured with a temperature offset parameter for correcting a temperature control deviation of the pot temperature;

in each control period, the measured value of the pot temperature is made to reach the sum of the set value of the pot temperature and the temperature deviation value obtained from the cooking program.

Optionally, the burner is provided with a detection hole for detecting the temperature of the bottom of the pot, and the temperature sensor and the detection hole are assembled, preferably the detection hole is arranged at the center side of the burner and arranged along the vertical direction.

Optionally, the temperature sensor is an infrared temperature sensor and is arranged at the lower end side of the detection hole, and the measuring end part of the infrared temperature sensor faces upwards to the detection hole; alternatively, the first and second electrodes may be,

the temperature sensor is a thermocouple device and is arranged in the detection hole, and the measuring end part of the thermocouple device penetrates through the detection hole and protrudes out of the upper end face of the combustor.

Optionally, the gas stove further comprises at least one of an ignition needle, a flame detection needle, a proximity sensor and an overflow sensor; the ignition needle is used for igniting the combustor, the flame detection needle is used for detecting whether flame exists on the combustor, the proximity sensor is used for detecting whether a cooker exists on the gas stove, and the cooker overflowing sensor is used for detecting the cooker overflowing state.

Optionally, the controller obtains a detection signal of the flame detection pin, and generates a control signal to operate the ignition to ignite the burner when it is determined that the flame of the burner has been extinguished and the cooking program has not been executed based on the detection signal of the flame detection pin.

Optionally, the controller acquires a detection signal of a proximity sensor, and generates a control signal to control ignition to the burner when it is determined that a pot is on the gas stove based on the detection signal of the proximity sensor.

Optionally, the cooking program includes a program table and program parameters, the program table is further configured with setting values of a fire power control manner and a valve opening degree in association with time; the program parameters are configured with at least one of the set values of the temperature deviation value and/or the set values of the jump temperature, the valve control opening degree, the heat preservation temperature and the temperature control tolerance.

Optionally, the overflow pan sensor is a thermocouple, and a measuring end of the overflow pan sensor is arranged in a water containing disc of the gas stove; alternatively, the first and second electrodes may be,

the overflow pot sensor is an ultrasonic sensor or a photoelectric sensor for detecting foam, is arranged above the pot, and has a detection end opposite to the inside of the pot; alternatively, the first and second electrodes may be,

the overflow pot sensor is an ultrasonic sensor or a photoelectric sensor for displacement detection, is arranged above the pot, and the detection end part of the overflow pot sensor is opposite to the pot cover of the pot.

Optionally, the controller acquires a detection signal of the overflow pan sensor, and based on the detection signal of the overflow pan sensor, when the overflow pan state is determined to occur, the controller generates a control signal to operate the electrically controlled fuel valve to reduce the opening degree, reduce the firepower of the burner, and eliminate the overflow pan; alternatively, the controller decreases the set value of the temperature offset value in the cooking recipe; or reducing the set value of the program step temperature corresponding to the overflowing state in the cooking program until the overflowing is eliminated.

The intelligent gas stove is provided with a burner, an electric control gas valve, a temperature sensor and a controller, wherein a cooking program is arranged in the controller. The electric control gas valve comprises a plug valve and a driving motor, and an output shaft of the driving motor is connected with a valve rod shaft of the plug valve. The gas inlet of the electric control gas valve is communicated with a gas pipe positioned in the gas stove, the gas outlet is communicated with the gas inlet of the combustor through a pipeline, the flow or the pressure of the gas conveyed to the combustor is adjusted, and the firepower of the combustor is changed. The temperature sensor is assembled on the gas stove and used for detecting the temperature of the bottom of the cooker. When cooking food, the controller obtains a cooking program corresponding to the cooked food, and the cooking program is configured with a set value of the pot temperature associated with time. In the cooking process, the controller collects a measured value of the temperature of the cooker measured by the temperature sensor and obtains a set value of the temperature of the cooker from a cooking program, and generates a control signal to operate the driving motor to rotate according to the set value of the temperature of the cooker and the measured value of the temperature of the cooker, the driving motor drives the valve rod of the plug valve to rotate, the opening degree of the plug valve is changed, the flow or the pressure of gas is adjusted, the fire power of the gas stove is controlled, the measured value of the temperature of the cooker reaches the set value of the temperature in the cooking program until the time configured in the cooking program is executed, and the cooking of food is completed. In the whole cooking process, the gas stove automatically cooks food without the participation of a user. The gas stove of the invention is very suitable for automatically cooking soup, cooking rice, cooking porridge and baking cakes. More importantly, the gas range can also cook rice with rice crust based on the selected cooking style.

Advantageous effects

The gas stove automatically controls firepower, cooks food and does not need participation of users. An electric control gas valve, a temperature sensor and a controller are arranged in the gas stove. The electric control gas valve is assembled in an air inlet pipeline of the combustor and used for adjusting the flow or pressure of gas conveyed to the combustor, and the temperature sensor is assembled on the gas stove and used for detecting the temperature of the bottom of the pot. When food is cooked, the controller acquires a cooking program corresponding to the cooked food, in the cooking process, the controller generates a control signal based on the measured value of the temperature of the cooker and the set value of the temperature of the cooker in the cooking program to control the driving motor to rotate, the driving motor drives the valve rod of the plug valve to rotate, the valve opening of the plug valve is changed, the flow or the pressure of gas is adjusted, the size of the fire of the burner is controlled, the measured value of the temperature of the cooker reaches the set value of the temperature of the cooker, and the food cooking is completed until the time in the cooking program is executed. In the whole cooking process, the gas stove automatically controls the fire power and the duration of the burner based on the cooking program, so that food cooking is completed without user participation. The gas cooker is suitable for automatically cooking soup, rice, porridge and pancake, and more importantly, can cook rice with rice crust based on the selected cooking program.

Drawings

Fig. 1 is a schematic structural view of a gas range.

Fig. 2 is a schematic structural diagram of a furnace end.

FIG. 3 is a schematic view of the structure in the direction A-A in FIG. 1.

Fig. 4 is a schematic structural view of a gas range in an application state.

Fig. 5 is a schematic view of another embodiment of a gas range.

Fig. 6 is a control schematic block diagram of the controller.

Wherein, 11-burner, 111-burner, 1111-outer ring base, 1112-inner ring base, 1113-ejector, 1113 a-outer ring ejector, 1113 b-inner ring ejector, 1114-detection hole, 1114 a-1 st detection hole, 1114 b-2 nd detection hole, 114-nozzle, 114 a-outer ring nozzle, 114 b-inner ring nozzle, 112-outer ring fire cover, 113-inner ring fire cover, 12-electric control gas valve assembly, 121-electromagnetic valve, 122-plug valve, 123-driving motor, 124-speed reducer, 13-ignition needle, 14-flame detection needle, 15-temperature sensor, 16-proximity sensor, 17-overflow sensor, 18-gas stove shell, 181-stove bottom shell, 182-stove top shell, 19-pot support, 20-controller, 21-power supply unit.

Detailed Description

In order to clarify the technical solution and technical object of the present invention, the present invention will be further described with reference to the accompanying drawings and the detailed description. The directional indications (such as up, down, left, right, front, rear, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the movement, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indication is changed accordingly. It should be noted that for convenience of illustration certain details of the invention are shown to facilitate reading and understanding of the drawings, wherein the burner head components in fig. 3-5 are not drawn to scale.

As shown in fig. 1 to 6, the intelligent gas stove of the present embodiment includes a burner 11, an electrically controlled gas valve assembly 12, an ignition needle 13, a flame detection needle 14, a temperature sensor 15, a proximity sensor 16, an overflow sensor 17, a gas stove housing 18, a pot support 19, a controller 20, and a power supply device 21. The electric control gas valve assembly 12 comprises an electromagnetic valve 121 and an electric control gas valve; the electric control gas valve mainly comprises a plug valve 122 and a driving motor 123, wherein an output shaft of the driving motor 123 is connected with a valve rod shaft of the plug valve 122 and is used for changing the flow or pressure of gas conveyed to the burner and controlling the fire power of the burner. The electromagnetic valve 121 is communicated with the plug valve 122 and is fixed. The air inlet of the burner 11 is communicated with the air outlet of the electric control gas valve assembly 12, and the air inlet of the electric control gas valve assembly 12 is communicated with the gas pipe in the gas stove. An ignition needle 13 and a flame detection needle 14 are fixed to the burner 11 for igniting the burner 11 and detecting the presence or absence of a flame on the burner 11. The central portion of the burner 11 is provided with a sensing hole 1114, and the temperature sensor 15 is assembled with the sensing hole 1114 of the burner 11 for sensing the temperature of the bottom of the pot 00 placed on the gas range. The proximity sensor 16 is fitted with a sensing hole 1114 of the burner 11 for sensing the presence or absence of the pot 00 on the gas range. The overflow sensor 17 is assembled with the gas stove, and the measuring end part of the overflow sensor is arranged in a water containing disc sleeved around the burner 11 and used for detecting whether the liquid in the pot 00 overflows or not. The power supply device 21 converts the commercial power into low-voltage direct current required by the controller 20 for supplying the controller 20 with electric power. The electric control gas valve assembly 12, the ignition needle 13, the flame detection needle 14, the temperature sensor 15, the proximity sensor 16 and the overflow sensor 17 are respectively and electrically connected with the controller 20. The controller 20 has a cooking program for cooking food therein. The cooking recipe is configured with a set value of pot temperature and a set value of time associated with time. When cooking food, the controller 20 obtains a cooking program adapted to the food to be cooked; during the cooking process, the controller 20 collects the measured value of the pot temperature detected by the temperature sensor 15 and obtains the set value of the pot temperature from the cooking program, performs calculation processing based on the measured value of the pot temperature and the set value of the pot temperature, generates a control signal to operate the electrically controlled gas valve assembly 12, adjusts the flow rate/pressure of the gas flowing through the electrically controlled gas valve assembly 12, changes the burner fire, and makes the measured value of the pot temperature detected by the temperature sensor 15 equal to the set value of the pot temperature until the cooking program is executed, thereby completing the cooking. The gas range of the present embodiment is suitable for automatically cooking soup, cooking rice, cooking porridge, and pancake based on a cooking program. The user only needs to put the prepared food material into the pot, select the corresponding cooking program, based on the cooking program, the controller 20 controls the gas stove to ignite, adjust the firepower, heat the pot to cook food, so that the heated temperature of the pot is equivalent to the set value of the temperature in the cooking program, and the cooking is automatically finished without the participation of the user.

As shown in fig. 1 and 2, the burner 11 includes a burner 111, an outer ring fire cover 112, an inner ring fire cover 113, and a nozzle 114. The burner 111 includes an outer ring base 1111, an inner ring base 1112, and an injector 1113. The lower end of the outer ring base 1111 is provided with three fixing lugs for fixing with the gas stove shell. The ejector 1113 includes an outer annular ejector 1113a and an inner annular ejector 1113 b. The nozzles 114 include an outer ring nozzle 114a and an inner ring nozzle 114 b. The outer ring base 1111 is an annular body, and an annular air passage for gas circulation is provided therein, the upper end of which is open. The inner ring base 1112 is a cylindrical body having a through hole along its axial direction at the middle portion, and the through hole is called a 1 st detection hole 1114a for the temperature sensor 15 to detect the temperature at the bottom of the pot 00. An annular air passage for gas circulation is provided in the inner ring base 1112, and has an open upper end. Inner ring base 1112 is arranged in outer ring base 1111, and inner ring base 1112 and outer ring base 1111 coaxial, inner ring base 1112 and outer ring base 1111 are fixed mutually, are provided with the air vent that is used for the circulation of air between inner ring base 1112 and outer ring base 1111. Two mounting holes arranged in a vertical direction for mounting the ignition needle 13 and the flame detection needle 14 are provided between the inner ring base 1112 and the outer ring base 1111. Outer loop ejector 1113a is including the shrinkage pipe portion, mixing pipe portion and the diffusion pipe portion of fixed connection in proper order, and outer loop ejector 1113 a's diffusion pipe portion and outer loop base 1111 are fixed mutually to be linked together with the annular air flue of outer loop base 1111, outer loop ejector 1113 a's shrinkage pipe portion and outer loop nozzle 114a are fixed, outer loop nozzle 114a, outer loop ejector 1113a and outer loop base 1111 are linked together in proper order, are used for carrying the gas annular air flue in the outer loop base 1111. Inner ring ejector 1113b is including the convergent pipe portion, mixing pipe portion and the diffusion pipe portion of fixed connection in proper order, and the diffusion pipe portion and the inner ring base 1112 of inner ring ejector 1113b are fixed mutually to be linked together with the annular air flue of inner ring base 1112, the convergent pipe portion and the inner ring nozzle 114b of inner ring ejector 1113b are fixed, inner ring nozzle 114b, inner ring ejector 1113b and inner ring base 1112 are linked together for carry the gas to the built-in annular air flue of inner ring base 1112. The middle part of inner ring fire lid 113 is equipped with along vertical direction's through-hole, is marked as 2 nd inspection hole 1114b, and inner ring fire lid 113 embeds there is terminal surface open-ended cyclic annular air flue down, is provided with a plurality of fire holes on the inner ring fire lid 113, and this fire hole and cyclic annular air flue intercommunication can be understood as inner ring fire lid and be the ring body. The annular air passage of inner ring fire cover 113 is matched with the annular air passage of inner ring base 1112. The inner ring fire cover 113 covers the inner ring base 1112, the lower end face of the inner ring fire cover 113 is attached to the upper end face of the inner ring base 1112, and an annular air chamber formed by annular air passages is formed inside the inner ring fire cover 113 and the inner ring base 1112 and used for uniformly distributing the gas to each fire hole of the inner ring fire cover 113. The 2 nd detection hole 1114b and the 1 st detection hole 1114a are coaxial and form a through hole in the vertical direction, called as a detection hole 1114, for the temperature sensor 15 to detect the temperature of the bottom of the pot placed on the burner 11 and the proximity sensor 16 to detect the presence or absence of the pot on the burner 11. The outer ring fire cover 113 is an annular body, an annular air passage with an opening at the lower end surface is arranged in the outer ring fire cover 113, and a plurality of fire holes are arranged on the outer ring fire cover 113 and communicated with the annular air passage. The annular air passage of the outer ring fire cover 113 is matched with the annular air passage of the outer ring base 1111. The outer ring fire cover 113 is covered on the outer ring base 1111, the lower end face of the outer ring fire cover 113 is attached to the upper end face of the outer ring base 1111, and an annular air chamber formed by an annular air passage is formed inside the outer ring fire cover 113 and the outer ring base 1111 and used for uniformly distributing the gas to each fire hole of the outer ring fire cover 113.

The flame detection needle 14 is a thermocouple flame detection needle, and has a reliable structure and a low failure rate. In addition, the flame detection needle 14 can be replaced by an ion flame detection needle, and the reaction is sensitive.

Wherein, the temperature sensor 15 is a thermocouple device. The thermocouple device, as shown in fig. 3, includes a thermocouple, a spring, and a fixing base. The thermocouple is packaged into a cylindrical body with a circular end face, the upper end part of the cylindrical body is a temperature detection end, and the lower end part of the cylindrical body is a sliding fit assembly end. A columnar blind hole with an opening at the upper end is arranged in the fixed seat along the vertical direction; the lower end part of the thermocouple can be arranged in the blind hole of the fixed seat and is in sliding fit with the blind hole of the fixed seat. The lower end part of the thermocouple and the spring are sequentially assembled in the blind hole of the fixing seat, the lower end part of the thermocouple, the spring and the bottom end part of the blind hole of the fixing seat are sequentially attached, the spring is in a compressed state, and the thermocouple can slide up and down relative to the fixing seat. .

The proximity sensor 16 is a mechanical proximity switch, preferably a low-cost tactile mechanical proximity switch. An optional assembling mode is that the proximity switch is assembled at the bottom of the fixed seat blind hole and is positioned below the spring, namely between the spring and the bottom end of the fixed seat blind hole, so that the lower end part of the thermocouple, the spring, the proximity switch and the bottom end of the fixed seat blind hole are sequentially attached, and the spring is in a compressed state. When no cooker is arranged on the gas stove, although the spring is in a compressed state, the compression amount is small, the elasticity of the spring is small, and the approach switch cannot be triggered to send an approach signal; however, when the pot is placed on the gas range, the thermocouple device is pressed by the pot, as shown in fig. 4, the thermocouple of the thermocouple device moves downwards, the spring is further compressed, the elastic force of the spring is increased, and the proximity switch is triggered to generate a proximity signal, which indicates that the pot is on the gas range. Therefore, the proximity sensor 16 selects a light-touch mechanical proximity switch, the mechanical proximity switch and the temperature sensor 15 are integrated into one component, a temperature measurement proximity assembly is manufactured, installation and maintenance are convenient, more importantly, the number of exposed parts in the gas stove can be reduced, and in addition, the mechanical proximity switch is selected, and the cost of the proximity sensor 16 is also favorably reduced.

It should be noted that: the temperature sensor 15 can also be an infrared temperature sensor for non-contact temperature measurement, and the proximity sensor 16 can be a non-contact photoelectric proximity sensor. The infrared temperature sensor and the photoelectric proximity sensor are assembled with the burner 11 through the fixing frame, as shown in fig. 5, the infrared temperature sensor and the photoelectric proximity sensor are located at the lower end side of the detection hole 1114, and the detection end parts of the infrared temperature sensor and the photoelectric proximity sensor are vertically arranged upwards and face the detection hole 1114. Infrared temperature sensor can detect the temperature of putting pan 00 bottom on the combustor through detection hole 1114, and photoelectric proximity sensor can detect through detection hole 1114 whether have pan 00 on the combustor. In addition, the photoelectric proximity sensor may also be disposed on a cooktop case of a gas range (not shown).

Wherein, the overflow pan sensor 17 can be a thermocouple. A thermocouple constituting the spill pan sensor 17 is fitted to the burner 11, and a detection end portion of the thermocouple is disposed in a water containing tray fitted around the burner 11. The detection tip of this thermocouple is heated by the heat of combustor 11 radiation, and the temperature is higher, and when the pan took place to overflow the pot, the liquid overflow in the pan 00, the liquid of overflow is collected in holding the water tray, and the detection tip of thermocouple contacts the liquid of overflow and is cooled down, and the temperature of thermocouple descends fast, forms the cooling step on the temperature curve that the thermocouple detected, can be used for judging that pan 00 has taken place to overflow the pot state in view of the above. The thermocouple is used as the overflow sensor 17, the cost is low, but the overflow state of liquid overflowing in the pan 00 can be detected only, and the overflow condition of the pan which is provided with the overflow condition but not overflowed can not be detected. For example, after the liquid in the pot 00 is boiled, the liquid is continuously heated, a large amount of foam is generated on the surface of the liquid in the pot, the foam covers the whole liquid surface, the height of the foam is gradually increased, when the top end face of the foam is in contact with the pot cover, the condition that the pot overflow occurs is met, and the pot overflow will occur, however, the thermocouple forming the pot overflow sensor 17 cannot detect that the pot overflow condition is met, and the pot overflow state that the pot overflow is not achieved is not met, so that the occurrence of pot overflow cannot be avoided.

The ultrasonic sensor is adopted to replace the thermocouple for detecting the overflowing pot, and the ultrasonic sensor is used for detecting the foam and the height of the foam generated on the surface of the liquid, so that the problems can be well solved, and the overflowing pot is avoided. The ultrasonic sensor is arranged above the cooker, as shown in fig. 4, the detection end part of the ultrasonic sensor is opposite to the inner part of the cooker, such as the detection window on the cooker cover is opposite to the inner part of the cooker. The ultrasonic sensor can detect the foam and the height of the liquid surface in the pot 00 through the detection window. The controller 20 acquires the detection signal of the ultrasonic sensor, when the detection signal of the ultrasonic sensor is used for determining that the height of the foam in the pot 00 reaches the preset height threshold value, the controller 20 judges that the pot overflowing condition of the pot 00 is met, generates a control signal to control the electric control gas valve, reduces the valve opening degree, reduces the firepower of the burner 11, reduces or even eliminates the height of the foam in the pot 00, can ensure that the pot 00 does not overflow the pot, and keeps the cleanness of the gas stove and the cooking bench. In addition, the ultrasonic sensor can be replaced by a photoelectric sensor for the foam detection side. Therefore, when the overflow sensor 17 is an ultrasonic wave sensor or a photoelectric wave sensor for detecting foam, and the pan 00 overflow condition is met but the pan is not overflowed, the controller 20 determines that the pan overflow state is generated, generates a control signal to operate the electrically controlled gas valve, reduces the fire power of the burner 11, eliminates the pan overflow condition of the pan 00, can avoid the occurrence of pan overflow, and avoids the overflow liquid from dirtying the gas stove and the cooking bench.

As shown in fig. 1, the electrically controlled gas valve assembly 12 includes an electromagnetic valve 121 and an electrically controlled gas valve. The electric control gas valve comprises a plug valve 122, a driving motor 123 and a speed reducer 124. The plug valve 122 is a plug valve commonly used in the gas stove of the prior art and is provided with an air inlet and two air outlets; one of the two air outlets is a large-flow air outlet, and the other air outlet is a small-flow air outlet. The output shaft of the driving motor 123 is connected to the stem shaft of the plug valve 122 through a speed reducer 124, and drives the stem to rotate, thereby adjusting the valve opening of the plug valve 122, changing the flow rate of the gas flowing into the burner, and controlling the fire power of the burner 11. It is also understood that the output shaft of the driving motor 123 is connected to the input shaft of the speed reducer 124, and the output shaft of the speed reducer 124 is connected to the valve stem shaft of the plug valve 122 for adjusting the valve opening. The gas inlet of the electromagnetic valve 121 is used for being communicated with a gas conveying pipe in a gas stove, the gas outlet of the electromagnetic valve 121 is communicated with the gas inlet of the plug valve 122, the large-flow gas outlet of the plug valve 122 is used for being communicated with the input port of the outer ring nozzle 114a, and the small-flow gas outlet of the plug valve 122 is used for being communicated with the input port of the inner ring nozzle 114 b. The driving motor 123 is one of a servo motor, a stepping motor and a variable frequency motor. When the driving motor 123 is a stepping motor, the driving motor 123 and the valve rod of the plug valve 122 may be directly connected by a shaft, or may be connected by a speed reducer 124 by a shaft. When the driving motor 123 is a servo motor or a variable frequency motor, the driving motor 123 must be connected to the valve stem shaft of the plug valve 122 through the reducer 124. The electromagnetic valve 121 and the plug valve 122 are sequentially communicated and assembled and fixed, the driving motor 123 is connected with a valve rod shaft on the plug valve 122 through the speed reducer 124, and the driving motor 123 and the plug valve 122 are fixed mutually to form the electric control gas valve assembly 12. The electromagnetic valve 121, the plug valve 122, the driving motor 123 and the speed reducer 124 are integrated into a component to be made into the electric control gas valve assembly 12, so that the gas stove is convenient to assemble, connect and maintain daily.

As shown in fig. 1 and 3, the gas range housing 18 includes a bottom range case 181 and a top range case 182. The stove bottom case 181 is made of a thin steel plate by stamping. The left side and the right side in the kitchen bottom case 181 are respectively provided with a mounting position for mounting the burner 11 and the electric control gas valve assembly 12; and mounting sites for mounting the controller 20 and the power supply device 21. The top case 182 is made of a thin steel plate by stamping, and the top case 182 is provided with through holes through which the valve rods of the two groups of burners 11 and the plug valves can pass.

As shown in fig. 6, the controller 20 includes a processor, a memory, a solenoid valve driving circuit, a motor driving circuit, an ignition circuit, a sensor circuit, a network module, a keyboard interface circuit, a display driving circuit, a fire power control interface, and a cooking program embedded in the memory. The memory, the electromagnetic valve driving circuit, the motor driving circuit, the ignition circuit, the sensor circuit, the network module, the keyboard interface circuit, the display driving circuit and the fire control interface are respectively and electrically connected with the processor. The touch screen is electrically connected to a processor built in the controller 20 through a display driving circuit, and the dedicated keyboard is electrically connected to the processor built in the controller 20 through a keyboard interface circuit. The mobile terminal, such as a mobile phone, a tablet computer, etc., establishes a communication connection with the processor built in the controller 20 through the network module. The ignition needle 13 is electrically connected to a processor built in the controller 20 via an ignition circuit. The drive motor 123 is electrically connected to a processor built in the controller 20 via a motor drive circuit. The solenoid valve 121 is electrically connected to a processor built in the controller 20 via a solenoid valve drive circuit. The flame detection needle 14, the temperature sensor 15, the proximity sensor 16 and the overflow pan sensor 17 are electrically connected to a processor built in the controller 20 through sensor circuits, respectively. The cooking program is stored in a memory built in the controller 20. The cooking program is configured as a set of controlled variables associated with time, stored in memory, that control the controlled variables to cause the burner to produce the desired power to cook the food item. The touch screen, the dedicated keyboard, and the mobile terminal can be used to modify the cooking program stored in the controller 20, set a new cooking program, and manually control the fire intensity and duration of the gas stove. One or more of the touch screen, the special keyboard and the mobile terminal can be selected and matched according to needs, and the touch screen and the special keyboard are preferred in the embodiment. The special keyboard is provided with an ignition key, a flameout key, an increase key, a decrease key and an affirmation key, and the keys are used for manually controlling the ignition, the flameout, the increase of firepower, the decrease of firepower and the modification of cooking programs of the gas stove. The application software interface of the touch screen is also provided with an ignition key, a flameout key, an increase key, a decrease key and an acknowledgement key, and the keys are used for manually controlling the ignition, flameout, fire power increase, fire power decrease and cooking program modification of the gas stove. The fire control interface is used for connecting an external standard control signal, such as a 4-20mA analog control signal, and the external signal can control the fire of the burner 11 through the fire control interface, so that the fire control interface can be conveniently used in cooperation with peripheral equipment (such as an intelligent pot). When the gas stove works with peripheral equipment, the detection signal of the temperature sensor 15 collected by the controller 20 is not involved in control, and is only used for abnormality monitoring. The processor, the memory, the electromagnetic valve driving circuit, the motor driving circuit, the ignition circuit, the sensor circuit, the network module, the keyboard interface circuit, the display driving circuit and the fire control interface are arranged on the same circuit board and are electrically connected with the touch screen, so that the number of parts of the gas stove is reduced, the failure rate is favorably reduced, and the gas stove is more convenient to assemble, install and maintain. The controller 20 may be configured by a PLC, a PLD, or the like.

The power supply device 21 adopts a switching power supply, is used for converting the commercial power of 110V-250V into the voltage and current of the grade required by the controller, and can select a direct current power supply outputting 5V. The power supply device 21 includes a voltage step-down circuit, a filter circuit, and a voltage stabilizing circuit, which are conventional technologies.

The gas cooker of the present embodiment is a double burner gas cooker, and as shown in fig. 1, the two burners have the same structural configuration. The controller 20 is designed with two sets of control interfaces for controlling different burners, respectively.

The combustor 11, the automatically controlled gas valve assembly 12 that are located the left side are installed two corresponding installation positions at kitchen drain pan 181 left side lateral part respectively, as shown in the left half of fig. 1, the air inlet of automatically controlled gas valve assembly 12 (solenoid valve 121 promptly) is linked together with the gas-supply pipe 173 that is located in the gas-cooker, and the large-traffic gas outlet of automatically controlled gas valve assembly 12 (plug valve 122 promptly) is through pipeline and the input port intercommunication of outer ring nozzle 114a on the combustor 11, and the small-traffic gas outlet of automatically controlled gas valve assembly 12 (plug valve 122 promptly) is through pipeline and the air inlet intercommunication of inner ring nozzle 114b on the combustor 11. The ignition pin 13 and the flame detection pin 14 located on the left side are fixed in two mounting holes of the burner 111 of the burner 11 on the left side. The water containing plate at the left side is sleeved around the burner 11 and is used for receiving liquid overflowing from the cooker 00. The cooker overflow sensor 17 is assembled with the burner 11 at the left side by using a thermocouple, and is arranged in the water containing tray to detect whether the liquid in the cooker 00 overflows or not. The temperature sensor 15 adopts a thermocouple device, the temperature measuring approach assembly consisting of the approach sensor 16 and the thermocouple device is assembled in a detection hole 1114 of the left side burner 11 through a fixing frame, and the measuring end part of the thermocouple device passes through the detection hole, protrudes out of the upper end surface of the burner and is attached to the bottom of a pot placed on the burner 11.

The burner 11 and the electric control gas valve assembly 12 on the right side are respectively installed at two corresponding installation positions on the right side of the stove bottom case 181, as shown in the right half of fig. 1, an air inlet of the electromagnetic valve 121 constituting the electric control gas valve assembly 12 is communicated with an air delivery pipe 173 located in the gas stove, a large flow air outlet of the plug valve 122 constituting the electric control gas valve assembly 12 is communicated with an air inlet of an outer ring nozzle 114a on the burner 11 through a pipeline, and a small flow air outlet of the plug valve 122 constituting the electric control gas valve assembly 12 is communicated with an air inlet of an inner ring nozzle 114b on the burner 11 through a pipeline. The ignition pin 13 and the flame detection pin 14 located on the right side are fixed in both mounting holes of the burner 111 of the burner 11. The water containing pan at the right side is sleeved around the burner 11 at the right side and is used for receiving liquid overflowing from the pan 00. The overflow sensor 17 on the right side adopts the ultrasonic sensor, and is fixed with the right side part of the gas stove, the detection end part of the ultrasonic sensor is opposite to the inside of the pot 00 placed on the burner 11, and as shown in fig. 4, the foam in the pot can be detected. The proximity sensor 16 on the right side adopts photoelectric type proximity sensor, and infrared temperature sensor is selected for use to temperature sensor 15, and this photoelectric type proximity sensor and infrared temperature sensor pass through the mounting bracket and the inspection hole 1114 of right side combustor 11 and assemble mutually, are located the inspection hole 1114 and incline distolaterally down, and photoelectric type proximity sensor and infrared temperature sensor's detection tip is in the inside or the lower port of inspection hole 111, and the pan of putting on the combustor just relative.

The controller 20 is installed in the oven bottom case 181 at an installation position on the left side; the power supply device 21 is mounted in the oven bottom case 181 at a mounting position on the right side. The power supply device 21 is electrically connected to the controller 20 and supplies electric power to the controller 20. One group of control interfaces of the ignition needle 13, the flame detection needle 14, the temperature sensor 15, the proximity sensor 16, the pan overflowing sensor 17 and the controller 20 which are positioned on the left side are respectively and electrically connected, and the other group of control interfaces of the ignition needle 13, the flame detection needle 14, the temperature sensor 15, the proximity sensor 16, the pan overflowing sensor 17 and the controller 20 which are assembled on the right side burner 11 are respectively and electrically connected. The top case 182 covers the bottom case 181, and the valve stems of the left and right burners 11 and the electrically controlled gas valve assembly 12 penetrate through the through hole of the top case 182 and protrude from the top case 182. Two pot supports 19 are respectively placed on the top case 182, the pot support 19 on the left side and the burner 11 on the left side are coaxial, and the pot support 19 on the right side and the burner 11 on the left side are coaxial. Four corners of the cooking bottom case 181 are equipped with 4 support legs, which are located below the lower bottom surface of the cooking bottom case 181. It should be noted that the dual-burner gas range may also be controlled by two controllers 20 respectively.

It should be noted that the temperature sensor 15 can also be assembled with the bottom of the pot to directly detect the temperature of the bottom of the pot. For example, the temperature sensor 15 employs a thermocouple fitted in a temperature measuring hole in the bottom wall of the pot to more accurately detect the temperature of the pot.

Wherein, the cooking program comprises a program table and program parameters. The program table mainly comprises a data table formed by setting values of controlled variables (such as temperature) related to time, and comprises a plurality of program steps, wherein each program step comprises a setting value of time and a setting value of a controlled variable (such as temperature). The time set in the schedule will last for the entire cooking cycle, ranging from the time the food is put into the pot to light, the time the cooking is completed, to the time the fire is finally extinguished. The program parameters include one, two or more parameters, and the program parameters are associated with the program table for use; modifying the program parameters may optimize control of the cooking process by the controller 20. The cooking program is stored in the memory of the controller. A user with cooking skill can modify and define the required cooking program by himself through a touch screen, a special keyboard and other human-computer interaction interfaces, and the modified cooking program can be stored in the memory. A program table and program parameters of an optional cooking program are shown below, wherein the program table includes 7 program steps, each program step includes a set value of a 'temperature', 'fire power control mode', 'valve opening degree' controlled variable item, and a set value of a 'time' item.

A program table:

program parameters:

incubation temperature (/ ° c): 80; temperature control tolerance (/%): 2

Temperature offset value (/ deg.C): 5; sampling period (/ s): 10.

the controlled variables in the "program table" include "temperature", "fire control method", "valve opening degree", and "time". Wherein "temperature" means the target temperature to be reached by the pot during cooking of the food, preferably the temperature of the inner surface of the pot bottom. The 'fire control mode' comprises two control modes of 'valve control' and 'temperature control' for the fire of the gas stove, wherein the valve control mode refers to adjusting the opening of an electric control gas valve to control the burner to heat a cooker; the temperature control mode means that the opening of the electric control gas valve is changed to adjust the fire force of the burner, so that the measured value of the temperature of the cookware is consistent with the set value of the temperature. The "valve opening" indicates a target opening to be achieved by the electronically controlled gas valve at the "valve control" mode stage. In the stage of the valve control mode, the set value of the valve opening degree is effective, and the controller 20 operates the electric control gas valve to enable the opening degree of the electric control gas valve to reach the set value of the valve opening degree, such as 90% of the valve opening degree, so that the electric control gas valve can be used for heating a cooker by adopting large fire at the initial stage of cooking, and is controlled in an open loop manner; in the temperature control mode, the controller 20 performs an arithmetic process based on the measured value of the pot temperature and the set value of the pot temperature detected by the temperature sensor, generates a corresponding control signal to change the opening of the electrically controlled gas valve, and adjusts the fire power of the burner 11 so that the measured value of the pot temperature is equal to the set value, thereby performing a closed-loop control. "time" indicates that the controlled variable is gradually changed from the set value of the previous program step to the set value of the program step in the time period of the program step, and the slope change can be selected, and is only suitable for describing the controlled variables of "temperature" and "valve opening" of which the values can be continuously changed; for the 1 st program step, the set value of the controlled variable of the last program step is understood to be the set value of the controlled variable of the 1 st program step.

The program parameters include a temperature keeping temperature, a temperature deviation value, a temperature control tolerance and a sampling period. The "holding temperature" represents the temperature at which the food needs to be maintained after cooking of the food is completed. The temperature deviation value represents a correction parameter for correcting the temperature control deviation of the pot temperature, and is used for correcting the deviation of the pot temperature controlled by the temperature sensor relative to the set temperature so as to enable the heated temperature of the pot (the inner surface of the bottom of the pot) to be consistent with the expected set temperature. Factors that cause temperature control deviation of the temperature sensor include: the position of the temperature measuring point, the difference of the temperature sensor, the assembly deviation of the temperature sensor, the difference of the cookware (such as thickness, thinness and material) and the like. The measured value of the temperature of the pot detected by the temperature sensor is numerically consistent with the sum of the set value of the temperature obtained from the program table and the temperature offset value, so that the heated temperature of the pot reaches the set value of the temperature. For example, the expected temperature of the inner surface of the bottom of the cookware is 100 ℃, the set value of the temperature is 100 ℃, because the temperature measuring point detected by the temperature sensor is positioned on the lower surface of the bottom of the cookware, and the thermal resistance exists between the lower surface and the inner surface of the bottom of the cookware, when the temperature detected by the temperature sensor is 100 ℃, the temperature of the inner surface of the bottom of the cookware is less than 100 ℃, if possible 98 ℃, the set temperature is not reached,i.e. there is a 2 deg.c deviation, this temperature deviation can be corrected by a temperature offset value, which is set to 2 deg.c. In this state, the temperature sensor detects a temperature of 102 ℃ when the set value of the temperature is 100 and the temperature deviation value is 2 ℃, and when the temperature detected by the temperature sensor reaches 102 ℃, the temperature of the inner surface of the pot reaches 100 ℃, namely the desired temperature. For example, when the temperature sensor is replaced, the thermal condition of the cookware is changed due to the difference and assembly deviation of the temperature sensor, and the thermal condition of the cookware needs to be adjusted before use, so that the program table is suitable for the cookware with the new thermal condition. An alternative way of tuning, e.g. at a certain temperature set point T₀A lower heating pot, a first-grade temperature detector is adopted to measure the temperature value T of the inner surface of the bottom of the pot₁Adjusting the fire power of the gas stove to T₁And T₀When the pot temperature is equal to the set value T, the measured value of the pot temperature detected by the temperature sensor is Tc, and the measured value of the pot temperature Tc is equal to the set value T of the temperature₀The difference therebetween can be used as the initial set point for the temperature offset value. In addition, the temperature offset value can also be used to adjust the set value of the temperature of each program step in the cooking program, for example, the temperature offset value is increased by 2 ℃, which is equivalent to the increase of 2 ℃ in the set value of the temperature of each program step in the cooking program. The set value of the temperature deviation value is modified to be equivalent to the set value of the temperature of each program step in the integral upward or downward translation program table, so that the same program table can be suitable for cookers with different thicknesses and different materials, and the assembly deviation of the temperature sensor and the difference of the thermocouple can be modified, so that the program table can be suitable for cookers. The temperature control tolerance is used for representing the fluctuation range of the controlled target temperature of the cooker relative to the temperature set value in the cooking program; for example, a temperature control tolerance of 2% represents a relative value of 2% for the maximum deviation of the fluctuation range between the measured value of the pot temperature (i.e., the controlled target temperature) and the pot temperature set point allowed by the controller, such as: if the pot temperature setting is 200 ℃ and the temperature control tolerance is 2%, the measured value of the pot temperature (i.e. the controlled target temperature) is between 196 ℃ and 204 ℃, and the measured value of the pot temperature is considered to be equivalent to the pot temperature setting. The relative value of the temperature deviation is determined hereMeaning as follows: the relative value of the temperature deviation is ABS (measured value of temperature-set value of temperature)/set value of temperature 100%, the same as below. The "sampling period" represents the time interval between the controller acquiring the set value of the temperature, the set value of the fire power control mode, the set value of the valve opening from the program table and the measured value of the pot temperature from the temperature sensor, that is, the frequency of the controller controlling the fire power of the gas stove. The smaller the sampling period is set, the more accurate the controller controls the magnitude of the gas stove fire.

It should be noted that, when the program parameters of the cooking program are configured with the parameters of "jump temperature" and "valve opening", the program table of the cooking program can omit the controlled variables of "fire control method" and "valve opening". Thus, another alternative cooking recipe and recipe parameters is shown below, which includes only the "temperature" controlled variable term and the "time" term.

A program table:

program parameters:

jump temperature (/ deg.C): 60, adding a solvent to the mixture;

valve control opening (/%): 90, respectively;

incubation temperature (/ ° c): 80;

temperature offset value (/ deg.C): 5;

temperature control tolerance (/%): 2

Sampling period (/ s): 10.

the 'jump temperature' in the cooking program represents the temperature point when the fire control mode of the gas stove is switched from the valve control mode to the temperature control mode and from the temperature control mode to the valve control mode. When the measured value of the temperature of the cooker is smaller than the set value of the jump temperature, the firepower of the gas stove is controlled in a valve control mode; when the measured value of the temperature of the cooker is higher than the set value of the jump temperature, the firepower of the gas stove is controlled by adopting a temperature control mode. The "valve control opening" characterizes the opening, e.g. 90%, of the electronically controlled gas valve to be achieved in the valve control mode. The optional cooking program has a program table with only one controlled variable of temperature, which is very simple and has the disadvantage that the opening of the electrically controlled gas valve in the valve control mode stage is a constant value, but is sufficient to meet the control requirement.

It should be noted that, in cooking food, the whole cooking process can use the temperature control method to control the fire power of the gas stove, so that the temperature of the cooker reaches the set value of the temperature obtained from the cooking program, in this case, the controlled variables of "jump temperature" and "valve control opening" in the program parameters can be omitted, at this time, the cooking program is very simple, only the controlled variable of "temperature" is in the program table of the cooking program, and only the parameters of "heat preservation temperature", "temperature deviation value" and "temperature control tolerance" are in the program parameters.

In each sampling period, the controller 20 obtains the set values of the controlled variables such as the temperature set value and the valve opening degree from the program table of the cooking program by an interpolation method. It can be understood that the controller 20 divides the time period corresponding to the time setting value of the current program step into a plurality of corresponding small time periods according to the sampling period, such as 10s, each of the small time periods corresponds to one sampling period, and obtains the setting value of the controlled variable corresponding to each sampling period by interpolation according to the setting value of the controlled variable of the previous program step and the setting value of the controlled variable of the current program step. Preferably, the value is obtained by linear internal difference method, the temperature and valve opening controlled variable of each program step will be changed from the set value of the previous program step to the set value of the program step, i.e. the slope change. For example, for the example of the first program table mentioned above, the sampling period is 10s, the set value of the temperature in the sampling period is 70 ℃, the set value of the valve opening is 80% by the method of linear interpolation in the 9 th sampling period of the 2 nd program step, i.e., the sampling period corresponding to 1 minute 30 seconds, and the acquired fire power control mode is the "valve control" mode. In addition, the linear interpolation method can be replaced by polynomial interpolation, Newton interpolation or other interpolation methods, so that the controlled variable between program steps is smoothly and excessively replaced with the slope change.

The controller 20 is a control center of the gas range, and operates the gas range to automatically cook food. When cooking food each time, the controller 20 generates a control signal for ignition based on the received cooking trigger signal, including generating the control signal to operate an electromagnetic valve and a plug valve which form electric control gas to be opened, and enabling the plug valve to reach a preset opening degree; and generating a control signal to control the ignition to ignite the burner, the burner is ignited, and the gas stove heats the cooker. At the initial stage of cooking, based on the cooking program, the fire control mode is set as the valve control mode, the controller 20 generates a control signal to operate the driving motor, so that the opening degree of the plug valve reaches the set value of the valve opening degree, and the fire heating pot of the burner 11 is controlled; when the temperature of the pot is high, the fire control mode is set as the temperature control mode based on the cooking program, the controller 20 generates a control signal to control the driving motor based on the set value and the measured value of the pot temperature, adjusts the opening degree of the plug valve, changes the flow rate of the fuel gas flowing into the burner 11, and controls the fire of the burner 11 to make the measured value of the pot temperature equal to the set value of the pot temperature until the cooking program is executed in sequence, thereby completing one-time food cooking. Finally, the controller 20 generates a control signal to close the solenoid valve and extinguish the burner. In the cooking process, the gas stove automatically controls firepower, cooks food and does not need user participation. The intelligent gas stove of the embodiment is suitable for automatic cooking of soup, rice, porridge and pancake. The gas stove is provided with cooking programs corresponding to soup cooking, rice cooking, porridge cooking and pancake in advance (before leaving factory).

Next, the operation method, cooking principle and control process of the intelligent gas cooker for automatically cooking food will be described as follows, taking the first mentioned cooking program (without setting the temperature offset parameter) as an example.

S1: and (4) preparing food materials. The pot to be cooked is placed on the pot support of the gas stove, the pot cover is opened, the prepared food is placed in the pot, and the pot cover is covered.

S2: selecting a cooking program. The controller 20 obtains the corresponding cooking program from the internal memory by selecting the cooking program matched with the food to be cooked and the material of the pot through the touch screen or the keyboard on the gas stove.

S3: and (4) igniting and cooking. The intelligent gas stove is provided with two cooking modes of automatic cooking and manual cooking, and the default is the manual cooking mode. In the manual cooking mode, an ignition key is touched and pressed, and the gas stove is ignited; in addition, the automatic cooking mode is selected, and the gas stove is automatically ignited. During ignition, a user can press an ignition key on the keyboard to ignite and can also tap the ignition key on the touch screen to ignite. The gas stove is suitable for automatically cooking soup, cooking rice, cooking porridge and pancake, wherein the pancake needs to be turned over manually once if the pancake is a double-sided pancake, and then a pancake cooking program is selected once. In the "automatic" cooking mode, if the burner 11 is unexpectedly turned off and the cooking program is not executed, the controller 20 generates a control signal to operate the ignition pin 13 to reignite the burner 11 and continue cooking the food until the cooking program is executed by the controller, thereby completing the cooking of the food. The burner 11 is unexpectedly flamed out, if the automatic ignition is not successful for a plurality of times (such as 3 times), the controller sends out alarm information to warn the user to participate in the operation and eliminate the abnormality.

S4: taking out of the pot. After the cooking program is executed, the controller 20 generates a control signal to trigger the grower to emit an audible and visual alarm, so as to inform the user that the cooked food in the pot can be taken out. If the heat preservation function is not selected, the controller 20 generates a control signal to operate the electromagnetic valve of the electric control gas valve assembly to close, so that the gas circulation is blocked, and the burner is extinguished. If the heat preservation function is selected, the user does not take food for a long time, the controller 20 controls the gas stove to heat the cooker according to the set value of the heat preservation temperature in the program parameters, so that the measured value of the cooker temperature detected by the temperature sensor is equivalent to the set value of the heat preservation temperature, the temperature of the cooked food is maintained at the temperature set by the user, and the food is more suitable for being eaten at any time.

The controller 20 controls the heating power of the burner 11 according to the cooking program, heats the pot, and automatically cooks the food. The program table of the first cooking program comprises 7 program steps, wherein the 1 st program step and the 2 nd program step, the fire power control mode of the gas stove is set as a valve control mode; the heating power control method of the gas range is set as the temperature control method from the 3 rd program step to the 7 th program step. After the gas stove is operated and ignited by the controller 20, the controller 20 executes the 1 st program step of the program table, the 1 st program step adopts a valve control mode, the set value of the valve opening degree of the 1 st program step is 90%, the set value of the temperature is 60 ℃, in each control (/ sampling) period, the controller 20 obtains the set value of the valve opening degree from the 1 st program step of the program table to be 90%, based on the obtained set value of the valve opening degree, the controller 20 generates a control signal, operates the driving motor to rotate, the driving motor drives the valve rod of the plug valve to rotate, the valve opening degree of the plug valve reaches 90%, and the burner is controlled to heat a cooker by big fire, so that the cooker is heated rapidly. The controller 20 collects the detection signal of the temperature sensor 15 to obtain the measured value of the pot temperature, when the measured value of the pot temperature reaches 60 ℃ of the set value of the temperature of the 1 st program step, the controller 20 finishes the execution of the 1 st program step of the program table, and changes to the execution of the 2 nd program step, the 2 nd program step adopts a valve control mode, the set value of the valve opening of the 2 nd program step is 70%, the set value of the temperature is 80 ℃, and the setting value of the valve opening is reduced from 90% to 70% in the set time period of the 2 nd program step, and the same goes on. In each control period of the 2 nd program step, a linear interpolation method is used, the controller 20 obtains a set value of the valve opening degree from the 2 nd program step, based on the obtained set value of the valve opening degree, for example, the set value of the valve opening degree corresponding to the sampling period of the 2 nd program step of 1 minute 30 seconds is 80%, the controller 20 generates a control signal based on the obtained set value of the valve opening degree, controls the driving motor to rotate, the driving motor drives the valve rod of the plug valve to rotate, so that the valve opening degree of the plug valve reaches 80%, the heating power of the cooker is gradually reduced, the heating rate of the cooker is slowed down, and the cooker overflow and the cooker burnt caused by thermal inertia can be avoided. Meanwhile, the controller 20 collects the measured value of the pot temperature detected by the temperature sensor 15, compares the measured value of the pot temperature with the set value of the step 2 temperature of the program table of 80 ℃, when the measured value of the pot temperature detected by the temperature sensor 15 reaches the set value of the step 2 temperature of 80 ℃, the fire control mode of the gas stove is converted from the valve control mode to the temperature control mode, and the controller 20 finishes the execution of the step 2 of the program table and converts the execution into the step 3.

The heating power control method of the 3 rd program step is set as a temperature control method, and the set value of the valve opening degree in the program table is invalidated. The set point for the temperature in equation 3 was 95 deg.C, indicating that the pot temperature ramped up from 80 deg.C to 95 deg.C over the time period in equation 3. In each control cycle, the controller 20 acquires a measured value of the pot temperature detected by the temperature sensor 15, and acquires a set value of the pot temperature and a set value of the fire power control manner from the 3 rd step of the program table by a linear interpolation method. The setting value of the fire control mode is a temperature control mode, and the fire force of the burner is adjusted by adopting the temperature control mode. Based on the temperature control mode, the controller 20 compares the acquired measured value of the pot temperature detected by the temperature sensor 15 with the acquired set value of the pot temperature, when the acquired measured value of the pot temperature is smaller than the acquired set value of the pot temperature, the controller 20 generates a control signal including an increase of the valve opening of the electric control gas valve through calculation and sends the control signal to the motor driving circuit, the motor driving circuit controls the driving motor to rotate to drive the valve rod of the plug valve to rotate, the valve opening of the plug valve is increased, the firepower of the burner is increased, so that the temperature of the pot is increased until the measured value of the pot temperature detected by the temperature sensor 15 is equivalent to the acquired set value of the pot temperature; when the acquired measured value of the pot temperature detected by the temperature sensor 15 is greater than the acquired set value of the pot temperature, the controller 20 generates a control signal including the opening degree of the electrically controlled gas valve by calculation and sends the control signal to the motor driving circuit, the motor driving circuit controls the driving motor to rotate in the reverse direction to drive the plug valve to rotate in the reverse direction, so that the opening degree of the plug valve is reduced, the firepower of the burner is reduced, the temperature of the pot 00 is reduced, and the acquired measured value of the pot temperature detected by the temperature sensor 15 is equivalent to the acquired set value of the pot temperature. In the temperature control manner, the controller 20 generates a control signal to operate the electrically controlled gas valve based on the measured value and the set value of the boiler temperature, and adjusts the intensity of the burner fire so that the measured value of the boiler temperature is equal to the set value of the boiler temperature until the step 3 is executed. Thus, the controller 20 sequentially executes the 3 rd program step to the 7 th program step. When the controller 20 performs an arithmetic process on the acquired measured value of the pot temperature and the set value of the pot temperature to generate a control signal for adjusting the opening degree of the proportional valve, the arithmetic process may be performed by using a PI (proportional integral) control algorithm, a PD (proportional derivative) control algorithm, or a PID (proportional integral derivative) control algorithm with higher control accuracy. The PI control algorithm, the PD control algorithm, and the PID control algorithm are known in the art, and are described in textbooks of signal processing, and are not described in detail here. When the steps of the cooking program are sequentially executed by the controller 20 and a cooking process is completed, the controller 20 generates an alarm signal to trigger the alarm to sound and inform the user that the cooking process is completed and the user can enjoy the delicious food.

It should be noted that if the "temperature deviation value" parameter is adopted, the controller sequentially executes each program step of the cooking program in the automatic cooking process, and in each control period, the controller 20 compares the measured value of the pot temperature with the sum of the set value of the pot temperature and the temperature deviation value obtained from the cooking program, and in the power control stage, when the measured value of the pot temperature reaches the sum of the set value of the current program step temperature and the temperature deviation value, the execution of the program step is terminated; in the temperature control stage, based on the measured value of the cooker temperature and the sum of the acquired set value of the cooker temperature and the temperature deviation value, the calculation processing is carried out to generate a control signal to adjust the firepower of the gas stove, so that the measured value of the cooker temperature reaches the sum of the acquired set value of the cooker temperature and the temperature deviation value until the cooking program is executed by the controller, and the cooking of food is completed.

In the automatic cooking process, in each control period, the controller 20 acquires a detection signal of the flame detection pin 14, the controller 20 performs processing based on the detection signal of the flame detection pin 14, and when it is determined that the flame of the burner 11 is extinguished and the time in the cooking program is not finished, i.e. the cooking program is not finished, the controller 20 generates a control signal to operate the ignition pin 13 to ignite the burner 11 and continue cooking the food until the cooking of the food is finished; if the ignition is not successful for many times, a control signal is generated for closing the electromagnetic valve and triggering the alarm device to give out sound and light alarm, so that a user is warned to participate in processing and faults are eliminated. As a preferred embodiment, the controller 20 obtains a detection signal of the proximity sensor, and determines whether a pot is present or absent on the gas range based on the detection signal of the proximity sensor. In the automatic cooking process, if the flame of the burner 11 is accidentally extinguished, the cooking program is not executed, and the gas stove has a pot, the controller 20 generates a control signal to control the ignition needle 13 to ignite the burner 11, so as to continue to cook food, thereby avoiding the gas stove from being empty. When the cooking program is executed or the burner is flamed out and can not be ignited successfully, the controller generates a control signal for closing the electromagnetic valve forming the electric control gas valve assembly and cutting off the gas source so as to avoid gas leakage and accidents.

In the automatic cooking process, in each control period, the controller 20 acquires a detection signal of the overflow sensor 17, the controller 20 judges the overflow state based on the detection signal of the overflow sensor 17, and when the overflow state is judged, the controller 20 generates a control signal including the reduction of the gas stove fire power for controlling the electric control gas valve to reduce the opening, so that the fire power of the burner 11 is reduced, the overflow is eliminated, and the overflow is avoided from continuing; while the controller 20 performs an overflow count. When the overflow count is greater than the preset count threshold, for example, the overflow count is greater than 3 times, especially when continuous overflow count occurs, the controller 20 further performs the following overflow processing.

When the overflow count is greater than the preset count threshold, the controller 20 compares the set value of the temperature corresponding to the control period where the overflow occurs, which is obtained from the cooking recipe, with the set value of the current recipe step temperature, and calculates a difference between the set value of the temperature and the set value of the current recipe step temperature, where the difference is identified as the 1 st adjustment value. When the acquired temperature setting value corresponding to the control period at the time of the occurrence of the pot overflow is lower than the current program step temperature setting value, for example, the difference between the temperature setting value and the program step temperature setting value is 5-10 ℃, which indicates that the current program step temperature setting value in the cooking program is too high, at this time, the controller 20 reduces the temperature deviation value setting value in the cooking program, so that the controlled target temperature of the pot 00 is wholly shifted downward, the controlled target temperature of the pot is reduced, the pot overflow is eliminated, and the pot overflow is prevented from continuing. The magnitude of the decrease in the temperature offset value may be determined with reference to the 1 st adjustment value, optionally taking the value of a fractional magnitude of the 1 st adjustment value, such as 1/3, 1/2, or 2/3 where the magnitude of the decrease is the 1 st adjustment value. When the acquired temperature setting value corresponding to the control cycle at which the time of overflowing occurs is higher than the setting value of the program step temperature, if the difference between the temperature setting value and the current program step temperature setting value is 2-5 ℃, that is, the temperature setting value corresponding to the time of overflowing approaches the current program step temperature setting value, the controller 20 decreases the current program step temperature setting value in the cooking program, decreases the temperature setting values of the program steps, the temperature setting values of which are not less than the program step temperature setting value, decreases the controlled temperature of the cooker and the rising rate of the cooker temperature, gradually decreases the firepower of the gas stove, and decreases until the overflowing is eliminated. The reduction range of the set point of the program step temperature can be determined by referring to the 1 st adjustment value, and optionally, the reduction range is a partial value of the 1 st adjustment value, such as 1/3, 1/2 or 2/3, where the reduction range is the 1 st adjustment value. It should be noted that, after the overflow occurs, the controller 20 may also decrease the set value of the temperature offset value in the cooking program and the set value of the current program step temperature at the same time, in this case, in order to avoid the overshoot and cause the controlled target temperature of the pan to be too low, the sum of the decrease range of the temperature offset value and the decrease range of the program step temperature set value should be smaller than the 1 st adjustment value. After the controller 20 modifies the cooking program, the overflow count is processed by rule 0 to recover the value of 0.

After the controller 20 modifies the cooking program, for example, after the set value of the program step temperature or/and the set value of the temperature deviation value are reduced and modified, the controller 20 determines the overflow state based on the signal of the overflow sensor, and counts the overflow, when the overflow count is greater than the count threshold, the controller 20 modifies the cooking program again according to the above method, and the cycle is adjusted until the cooking program is executed, and the whole cooking process is completed. After cooking, the user may save the cooking program modified by the controller 20 for the next use

In addition, it can be understood that if the overflow sensor 17 adopts the ultrasonic sensor or the photoelectric sensor, the overflow sensor 17 detects the foam and the foam height on the surface of the pan or the motion state of the pan cover, and makes a judgment on the condition of overflow before the overflow occurs, and performs overflow processing, so as to reduce or even avoid the overflow. For example, foam is generated and accumulated on the liquid surface in the pot 00, when the height of the foam reaches a set height threshold value, if the top end face of the foam contacts the pot cover, the overflow tendency is generated, and the possibility of overflow is generated, the controller 20 judges the overflow state of the overflow condition, generates a control signal for reducing the fire power of the burner, operates the proportional valve to reduce the opening, reduces the fire power of the burner 11, reduces the foam generated in the pot 00, avoids overflow, and counts overflow at the same time.

In the temperature control mode, when the controller 20 controls the temperature of the pot, a concept of "temperature control tolerance" is introduced to avoid the controller frequently operating the electrically controlled gas valve. When the measured value of the temperature of the cooker is in the temperature range limited by the temperature set value and the temperature control tolerance, the measured value of the temperature of the cooker (namely the controlled target temperature) is equivalent to the set value of the temperature of the cooker, and the electric control gas valve does not need to be operated to adjust the fire of the burner, so that the service life of the electric control gas valve is prolonged, and the operation load of the controller is reduced. For example, it can be understood that: the set value of the temperature control tolerance is 2 percent, the set value of the cookware temperature is 200 ℃, the temperature fluctuation range limited by the set value of the cookware temperature and the temperature control tolerance is 196 plus 204 ℃, namely the temperature range is formed by the fluctuation of 2 percent up and down relative to the set value of the cookware temperature. When the measured value of the pot temperature is higher than the upper limit value 204 ℃ of the temperature range, the controller 20 operates the electric control gas valve to act, the valve opening is reduced, the fire power of the burner is reduced, the measured value of the pot temperature starts to fall, until the measured value of the pot temperature is lower than the lower limit value 196 ℃ of the temperature range, the controller operates the electric control gas valve to act, the valve opening of the electric control gas valve is increased, the gas flow is increased, the fire power of the burner is increased, the measured value of the pot temperature starts to rise, until the measured value of the pot temperature is higher than the upper limit value 204 ℃ of the set value, the electric control gas valve is operated again to reduce the valve opening, the burner is enabled to reduce the fire power, and therefore, the cycle is less in the number of times that the electric control gas valve is operated, the operation load of the controller is favorably reduced, and the service life of the electric control gas valve is favorably prolonged.

In the whole cooking process, the user does not need to participate, and the cooking is automatically finished by the gas stove. When the gas stove of the embodiment is used for cooking rice, the pan is a common cast iron pan with a circular arc bottom on the market, as shown in fig. 4. The controller 20 is provided with a cooking program without rice crust and a cooking program with rice crust. If the cooking program without the rice crust is selected, the rice without the rice crust can be cooked; if the cooking style with the rice crust is selected, the rice with the rice crust can be cooked, the rice with the rice crust has stronger fragrance and purer thickness than the rice without the rice crust, and the rice crust is golden yellow, crisp, fragrant and delicious. In addition, the pot can be common metal pots on the market by improving the cooking program for cooking rice, and the pot can be prevented from being stuck. For example, rice cooked with rice crust, the temperature of the pot is first lowered to a lower value, such as 50 degrees, then raised to a higher temperature, such as 140 degrees, after the crust is formed, and then the temperature is lowered and then raised, and so on, 2 to 3 times. The difference between the thermal expansion coefficients of the crispy rice and the metal pot is large, the difference between the thermal conductivity coefficients is large, the metal pot is a good thermal conductor in the processes of temperature reduction and rise, the temperature of the metal pot is fast to fall and rise, the crispy rice is a bad thermal conductor, the temperature of the crispy rice is slow to fall and rise, a large temperature difference is formed between the metal pot and the crispy rice, and large thermal stress is generated between the metal pot and the crispy rice due to the difference between the thermal conductivity coefficients of the metal pot and the crispy rice, the thermal stress promotes the relative displacement between the crispy rice and the metal pot to achieve thermal balance by slow-release thermal stress, so that the crispy rice and the cast iron pot are separated from each other, and the crispy rice is not stuck to the pot. The principle and the method of using the gas stove and the common aluminum or iron pan with thick bottom to iron the cakes can also ensure that the cakes are not stuck to the pan, are similar to the rice cooked with rice crust and are not repeated here.

The gas stove of the embodiment is provided with a burner, an electric control gas valve assembly, a temperature sensor and a controller. The electric control gas valve assembly mainly comprises an electromagnetic valve and an electric control gas valve which are sequentially communicated, wherein the electric control gas valve comprises a plug valve, a driving motor and a speed reducer, and the driving motor is connected with the plug valve shaft through the speed reducer. The plug valve is a plug valve which is commonly used in the gas stove in the prior art and is provided with an air inlet and two air outlets, wherein one air outlet is a large-flow air outlet, and the other air outlet is a small-flow air outlet. The air inlets of the inner ring fire and the outer ring fire of the burner are respectively communicated with two air outlets of a plug valve forming an electric control gas valve assembly, and the air inlet of an electromagnetic valve forming the electric control gas valve assembly is communicated with a gas pipe positioned in a gas stove. The temperature sensor is assembled with a detection hole in the middle of the burner through a fixing frame, and the temperature sensor detects the temperature of the bottom of the pot placed on the burner. The controller is built in with a cooking program for cooking food, the cooking program being configured with a set value of a pot temperature for cooking food and a set value of time in association with time. When cooking food, the controller acquires a cooking program corresponding to the cooked food; the controller acquires a set value of the pot temperature from the cooking program and collects a measured value of the pot temperature detected by the temperature sensor, and the controller performs operation processing based on the measured value of the pot temperature detected by the temperature sensor and the set value of the pot temperature, if a PI control algorithm, a PD control algorithm or a PID control algorithm is adopted, a control signal is generated to operate a driving motor, the driving motor drives a valve rod of a plug valve to rotate, the valve opening degree of the plug valve is changed, the gas flow and the gas pressure of the circulating plug valve are adjusted, and the fire power of a burner is controlled, so that the measured value of the pot temperature detected by the temperature sensor is equivalent to the set value of the pot temperature until the cooking program is executed by the controller; and finally, the controller generates a control signal to control an electromagnetic valve forming the electric control gas valve assembly to be closed, so that gas circulation is blocked, the burner is flamed out, and cooking is finished. The controller automatically adjusts the intensity of the fire of the burner and the duration time of the fire, so that the measured value of the temperature of the cooker reaches the set value of the temperature of the cooker in the cooking program until the set time in the cooking program is executed by the controller, the cooking process is finished, and the user does not need to participate in the whole cooking process. The gas range of the embodiment can automatically cook soup, rice, porridge, pancake and the like based on the cooking program. The user only needs to place a cooker on the gas stove, put prepared food materials into the cooker, select a cooking mode, the controller obtains a cooking program corresponding to the selected cooking mode from the memory, the controller controls the gas stove based on the set value of the cooker temperature in the cooking program, the fire power of the gas stove is adjusted, the heated temperature of the cooker is equal to the set value of the cooker temperature in the cooking program, the cooking is completed until the time in the cooking program is executed by the controller, and the whole cooking process does not need the user to participate.

The intelligent gas stove is also configured with an overflow pan sensor 17 to detect the overflow pan state of the pan. The controller 20 processes the detection signal of the overflow sensor 17, and when the overflow state is judged, the controller 20 generates a control signal to operate the electric control gas valve to reduce the opening degree, so that the burner reduces the firepower, the overflow is eliminated, and the overflow counting is carried out. When the overflow count is larger than the count threshold, such as 1 or 3 times, the controller decreases the set value of the temperature deviation value in the cooking program, or/and decreases the set value of the program step temperature corresponding to the overflow occurrence in the cooking program and the set value of each program step temperature whose temperature constant value is not smaller than the set value of the program step temperature, so as to reduce or even avoid the overflow occurrence. Thus, the controller 20 can optimize the cooking program itself

The gas range is also equipped with a flame detection needle and a proximity sensor. In the automatic cooking process, the controller acquires detection signals of the proximity sensor, the flame detection needle and the temperature sensor, judges that no flame exists on the gas stove based on the detection signals of the flame detection needle, and operates the ignition needle to ignite the burner when judging that a pot exists on the gas stove based on the detection signals of the proximity sensor; when no pan is arranged on the gas stove, the controller does not operate the ignition to ignite the burner, so as to avoid the empty burning of the gas stove and the waste of gas. In the automatic cooking process, if the gas stove is accidentally turned off and the cooking program is not executed completely, the controller generates a control signal to operate the ignition to ignite the burner when the controller judges that a cooker is arranged on the gas stove according to the signal of the proximity sensor, and the unexecuted cooking program is continuously executed until the set time of the cooking program is executed completely, so that the whole cooking process is completed. In the automatic cooking process, when the controller judges that no cooker is arranged on the gas stove, if the cooker is taken up, but the set time of the cooking program is not executed, after a certain time delay, if 1 minute, the controller generates a control signal to control an electromagnetic valve forming the electric control gas valve assembly to be closed, natural gas circulation is blocked, the burner is flamed out, and the gas stove is prevented from being idle to burn and waste gas when no cooker is arranged.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the foregoing description only for the purpose of illustrating the principles of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims, specification, and equivalents thereof.

Claims

1. An intelligent gas cooker, characterized in that the gas cooker comprises:

a burner adapted to heat a pot for cooking food;

the temperature sensor is used for detecting the temperature of the pot;

the electric control gas valve mainly comprises a plug valve and a driving motor, wherein the driving motor is connected with a valve rod shaft of the plug valve, and the plug valve is arranged in an air inlet pipeline of the burner and used for adjusting the firepower of the burner;

2. The intelligent gas cooker of claim 1, wherein:

the cooking program is also configured with a temperature deviation value parameter for correcting temperature control deviation of the pot temperature;

3. The intelligent gas cooker of claim 1, wherein:

the central side of the burner is provided with a detection hole for detecting the temperature of the bottom of the pot;

the temperature sensor is an infrared temperature sensor and is arranged on the lower end side of the detection hole, and the measuring end part of the infrared temperature sensor faces upwards and faces the detection hole; alternatively, the first and second electrodes may be,

4. The intelligent gas cooker of claim 1, wherein: the gas stove also comprises at least one of an ignition needle, a flame detection needle, a proximity sensor and an overflow sensor; the ignition needle is used for igniting the combustor, the flame detection needle is used for detecting whether flame exists on the combustor, the proximity sensor is used for detecting whether a cooker exists on the gas stove, and the cooker overflowing sensor is used for detecting the cooker overflowing state.

5. The intelligent gas cooker of claim 4, wherein: the controller acquires a detection signal of the flame detection pin, and generates a control signal to operate the ignition pin to ignite the burner when it is determined that the flame of the burner is extinguished and the cooking program is not executed based on the detection signal of the flame detection pin.

6. The intelligent gas cooker of claim 5, wherein: the controller acquires a detection signal of the proximity sensor, and generates a control signal to control ignition to ignite the burner when the gas stove is determined to have a pot on the gas stove based on the detection signal of the proximity sensor.

7. The intelligent gas cooker of claims 1-6, wherein:

the cooking program includes a program table and program parameters, the program table is also configured with setting values of a fire power control manner and a valve opening degree in association with time; the program parameters are configured with at least one of the set values of the temperature deviation value and/or the set values of the jump temperature, the valve control opening degree, the heat preservation temperature and the temperature control tolerance.

8. A pot overflow control method suitable for a gas stove is characterized in that a controller of the gas stove obtains a corresponding cooking program:

the controller acquires a detection signal of the pot overflow sensor, judges the state of pot overflow based on the detection signal of the pot overflow sensor and counts pot overflow; when the overflow count is larger than the preset count threshold, marking the difference value between the temperature set value corresponding to the control period of the overflow time and the temperature set value of the current program step, which are acquired from the cooking program, as the 1 st adjustment value;

when the acquired temperature set value corresponding to the control period of the time when the pot overflowing occurs is lower than the set value of the current program step temperature, the controller reduces the set value of the temperature deviation value in the cooking program and restores the pot overflowing count to 0 value; when the acquired temperature setting value corresponding to the control period of the time when the pot overflow occurs is higher than the setting value of the program step temperature, the controller reduces the setting value of the current program step temperature in the cooking program, reduces the setting value of the temperature of each program step of which the temperature setting value is not less than the setting value of the program step temperature, and restores the pot overflow count to 0 value.

9. The pot overflow control method of a gas range according to claim 8, wherein: the reduction amplitude of the temperature deviation value is determined by referring to the 1 st adjustment quantity value, and the value is a partial quantity value of the 1 st adjustment quantity value; alternatively, the magnitude of the decrease in the temperature offset value is any one of 1/3, 1/2, or 2/3 of the 1 st adjustment magnitude.

10. The pot overflow control method of a gas range according to claim 8, wherein: the reduction amplitude of the set value of the program step temperature is a partial quantity value of the 1 st adjustment quantity value; alternatively, the magnitude of the decrease in the set point of the program step temperature is any one of 1/3, 1/2, or 2/3 of the 1 st adjustment magnitude.