Method and device for controlling thermal field levelling of a multi-burner gas barbecue

Abstract

This invention relates to the field of equipment control technology and discloses a method and device for thermal field leveling control of a multi-burner gas grill. The method includes: acquiring a set of grill rack temperatures at different acquisition times; calculating the temperature rise slope within the oven cavity based on the air temperature; when the temperature rise slope exceeds a slope threshold, calculating the average temperature field based on the regional temperatures; calculating the temperature deviation value for each grill rack region based on the average temperature field and the regional temperatures; determining the relationship between the temperature deviation value of the grill rack region and the allowable error range; determining the target adjustment amount of the PWM duty cycle for the grill rack region based on the relationship; and controlling the opening degree of the electromagnetic proportional valve corresponding to the grill rack region based on the target adjustment amount. Therefore, this invention can achieve differentiated heat compensation for each region, improve the uniformity of the oven cavity temperature field in the simmering mode of a multi-burner gas grill, improve the accuracy of temperature regulation, improve the quality of grilled food, and reduce the difficulty of user operation.

Description

Technical Field

[0001] This invention relates to the field of equipment control technology, and in particular to a method and apparatus for thermal field leveling control of a multi-burner gas barbecue grill. Background Technology

[0002] Multi-burner gas grills, with their advantages of independent grilling in multiple zones and high cooking efficiency, have become the mainstream equipment for home and commercial outdoor barbecues. Among them, the braising mode is widely used for grilling various types of food because it can quickly raise the temperature of the oven cavity and lock in the juices and flavors of the food. However, in actual use, the temperature field inside the oven cavity of a multi-burner gas grill is easily affected by various factors such as gas pressure fluctuations, carbon buildup in the nozzles, external wind interference, and uneven airflow circulation in the oven cavity. This leads to significant temperature differences in different areas of the grill, causing some parts of the same batch of food to be burnt while others are undercooked, seriously affecting the grilling results.

[0003] In existing technologies, temperature control of multi-burner gas grills often relies on manual adjustment of gas valves. Some devices only incorporate single-point temperature sensors to monitor the average temperature of the oven cavity, failing to accurately and in real-time detect temperature differences across different areas of the grill. Furthermore, the adjustment precision is low, and it cannot achieve differentiated and dynamic compensation for the heat output of each burner, making it difficult to fundamentally address the technical challenge of uneven temperature distribution within the oven cavity during the simmering / grilling mode. Therefore, proposing a technical solution to improve the uniformity of the oven cavity temperature and the accuracy of temperature control in multi-burner gas grills during simmering / grilling mode is of paramount importance. Summary of the Invention

[0004] This invention provides a method and device for controlling the thermal field leveling of a multi-burner gas grill, which can help improve the uniformity of the oven cavity temperature field and the accuracy of temperature regulation in the simmering mode of the multi-burner gas grill.

[0005] To address the aforementioned technical problems, the first aspect of this invention discloses a method for heat field leveling control of a multi-burner gas grill, the method comprising: The temperature of the grill rack of the gas grill is collected to obtain a set of grill rack temperatures corresponding to different collection times. The set of grill rack temperatures includes the regional temperature of at least one grill rack area and the air temperature inside the oven cavity of the gas grill. Each grill rack area includes two independent electromagnetic proportional valves, and all electromagnetic proportional valves in each grill rack area share a temperature sensor for feedback control. Based on the air temperature inside the oven cavity at each collection time, the temperature rise slope inside the oven cavity of the gas grill is calculated, and it is determined whether the temperature rise slope inside the oven cavity is greater than a preset slope threshold. When the temperature rise slope in the oven cavity is greater than the slope threshold, the average temperature field of the gas grill oven is calculated based on the regional temperature of each grilling area, and the temperature deviation value corresponding to each grilling area is calculated based on the average temperature field and the regional temperature of each grilling area. For each of the baking grid areas, the relationship between the temperature deviation value of the baking grid area and the preset allowable error range is determined. Based on the relationship, the target adjustment amount of the PWM duty cycle corresponding to the baking grid area is determined, and the opening degree of the electromagnetic proportional valve corresponding to the baking grid area is controlled according to the target adjustment amount.

[0006] As an optional implementation, in the first aspect of the present invention, the method further includes: Before the gas grill is operated, the current ambient temperature of the gas grill is collected based on the thermocouple corresponding to each grilling area, and a reference temperature is determined based on the collected current ambient temperature. For each of the grilling areas, the test temperature of the gas grill is collected based on the thermocouple corresponding to the grilling area when the gas grill is running at the preset test firepower, and the installation position temperature compensation coefficient of the grilling area is calculated based on the test temperature and the reference temperature. Furthermore, the process of collecting the temperature of the grill rack of the gas-fired barbecue grill to obtain a set of grill rack temperatures corresponding to different collection times includes: The initial temperature of the gas grill is collected at different sampling times based on the thermocouples of each grilling area, and the air temperature inside the oven cavity of the gas grill is collected based on the oven cavity temperature acquisition element of the gas grill. The initial area temperature is compensated based on the installation location temperature compensation coefficient of each of the baking mesh areas to obtain the area temperature of each of the baking mesh areas at different collection times.

[0007] As an optional implementation, in the first aspect of the invention, the temperature rise slope within the oven cavity includes the regional temperature rise slope of each of the baking grid areas; Before controlling the opening degree of the electromagnetic proportional valve corresponding to the grilling area according to the target adjustment amount, the method further includes: For each of the baking grid areas, determine whether the temperature rise slope of the baking grid area is continuously lower than a preset load slope threshold. For each of the grilling areas, when the temperature rise slope of a certain grilling area is continuously lower than the load slope threshold, it is determined that there is an additional food load in the grilling area. Based on the average temperature field and the temperature deviation value corresponding to the grilling area, a firepower compensation coefficient is calculated. The firepower compensation coefficient is used to superimpose the target adjustment amount of all electromagnetic proportional valves in the grilling area.

[0008] As an optional implementation, in the first aspect of the present invention, the step of calculating the temperature rise slope of the gas-fired barbecue oven based on the oven cavity air temperature at each of the acquisition times, and determining whether the temperature rise slope of the oven cavity is greater than a preset slope threshold, includes: The furnace cavity air temperature at each acquisition time is fitted according to the time sequence to obtain the furnace cavity temperature change curve, and the furnace cavity temperature change curve is differentiated to obtain the furnace cavity temperature rise slope at the current time. The opening data of the electromagnetic proportional valve corresponding to each grilling area of ​​the gas grill is obtained, and it is determined whether the temperature rise slope in the oven cavity is greater than a preset slope threshold and whether the opening data of each electromagnetic proportional valve is within a preset stable range. When the temperature rise slope in the oven cavity is greater than the slope threshold and the opening data of each electromagnetic proportional valve is within the stable range, it is determined that the gas grill is in the braising mode, and the operation of calculating the average temperature field of the gas grill based on the regional temperature of each grill area is triggered. When the temperature rise slope in the oven cavity is less than or equal to the slope threshold, and / or when the opening data of each electromagnetic proportional valve is outside the stable range, it is determined that the gas grill is not in the simmering mode, and the operation of collecting the grill temperature of the gas grill continues.

[0009] As an optional implementation, in the first aspect of the present invention, the step of calculating the average temperature field of the gas grill based on the regional temperature of each of the grilling areas, and calculating the temperature deviation value corresponding to each of the grilling areas based on the average temperature field and the regional temperature of each of the grilling areas, includes: For each grilling area, a corresponding weighting coefficient is assigned to the grilling area according to the position information of the grilling area in the oven cavity of the gas grill, wherein the weighting coefficient of the edge area of ​​the oven cavity is lower than the weighting coefficient of the center area of ​​the oven cavity. The average temperature field of the gas-fired barbecue oven is calculated based on the regional temperature of each grilling area and the weighting coefficient of each grilling area. For each of the baking rack areas, the food load status data of the baking rack area is obtained, and the area temperature of the baking rack area is corrected according to the food load status data to obtain the corrected area temperature. Based on the corrected area temperature and the average temperature field, the temperature deviation value corresponding to the baking rack area is calculated.

[0010] As an optional implementation, in the first aspect of the present invention, determining the target adjustment amount of the PWM duty cycle corresponding to the grilling area based on the magnitude relationship, and controlling the opening degree of the electromagnetic proportional valve corresponding to the grilling area based on the target adjustment amount, includes: For each of the baking grid areas, the initial adjustment amount of the PWM duty cycle corresponding to the baking grid area is determined based on the temperature deviation value of the baking grid area and the magnitude relationship. Collect the gas pressure data of the gas grill, and perform pressure compensation correction on the initial adjustment amount of the PWM duty cycle corresponding to each grill area based on the gas pressure data to obtain the target adjustment amount of each grill area. For each of the baking grid areas, the PWM duty cycle corresponding to the baking grid area is adjusted according to the target adjustment amount corresponding to the baking grid area to obtain the adjusted PWM signal. The adjusted PWM signal is then converted into a drive current, and the drive current controls the electromagnetic proportional valve corresponding to the baking grid area to adjust to the target opening degree corresponding to the target adjustment amount according to a preset step size. Wherein, when the magnitude relationship indicates that the temperature deviation value of the baking griddle area is greater than the maximum error threshold corresponding to the allowable error range, the target adjustment amount indicates the amount of reduction of the PWM duty cycle to reduce the opening of the electromagnetic proportional valve corresponding to the baking griddle area; when the magnitude relationship indicates that the temperature deviation value of the baking griddle area is less than the minimum error threshold corresponding to the allowable error range, the target adjustment amount indicates the amount of increase of the PWM duty cycle to increase the opening of the electromagnetic proportional valve corresponding to the baking griddle area.

[0011] As an optional implementation, in the first aspect of the present invention, the method further includes: When the temperature rise slope in the furnace cavity is greater than the slope threshold, it is determined whether the temperature rise slope in the furnace cavity is greater than the preset dry burning threshold. When the temperature rise slope in the furnace cavity is greater than the dry burning threshold, the PWM duty cycle corresponding to each baking grid area is reduced to below the preset safety threshold, and a dry burning warning prompt is output. For each of the baking grid areas, when the PWM duty cycle of the baking grid area is adjusted for a preset number of consecutive times, and the temperature deviation value of the baking grid area is outside the allowable error range, the adjustment data of the baking grid area is recorded, and a gas nozzle carbon deposit warning message is generated.

[0012] As an optional implementation, in the first aspect of the present invention, the method further includes: When the gas grill is detected to have exited the roasting mode, residual heat temperature data of each grilling area in the oven cavity of the gas grill is collected. The closing parameters of the electromagnetic proportional valve corresponding to each of the baking grid areas are determined based on the residual heat temperature data of each baking grid area, and the corresponding electromagnetic proportional valve is controlled to perform a closing operation according to the closing parameters. The closing parameters include closing timing control parameters and closing rate control parameters. Record all data when the gas grill is in the braising mode, and iteratively update the slope threshold and the allowable error range based on the all data, and store the all data and the updated slope threshold and the allowable error range in the database.

[0013] The second aspect of this invention discloses a heat field leveling control device for a multi-burner gas grill, the device comprising: The data acquisition module is used to acquire the temperature of the grill rack of the gas barbecue oven and obtain the grill rack temperature set corresponding to different acquisition times. The grill rack temperature set includes the regional temperature of at least one grill rack area and the air temperature inside the oven cavity of the gas barbecue oven. Each grill rack area includes two independent electromagnetic proportional valves, and all electromagnetic proportional valves in each grill rack area share a temperature sensor for feedback control. The calculation module is used to calculate the temperature rise slope inside the oven cavity of the gas barbecue oven based on the air temperature inside the oven cavity at each collection time, and to determine whether the temperature rise slope inside the oven cavity is greater than a preset slope threshold. The calculation module is also used to calculate the average temperature field of the gas grill oven based on the regional temperature of each grilling area when the temperature rise slope in the oven cavity is greater than the slope threshold, and to calculate the temperature deviation value corresponding to each grilling area based on the average temperature field and the regional temperature of each grilling area. The determination module is used to determine the relationship between the temperature deviation value of each baking grid area and a preset allowable error range, determine the target adjustment amount of the PWM duty cycle corresponding to the baking grid area based on the relationship, and control the opening degree of the electromagnetic proportional valve corresponding to the baking grid area based on the target adjustment amount.

[0014] As an optional implementation, in a second aspect of the present invention, the acquisition module is further configured to acquire the current ambient temperature of the gas grill based on the thermocouple corresponding to each grilling area before the gas grill is operated, and determine a reference temperature based on each acquired current ambient temperature; The acquisition module is also used to acquire the test temperature of the gas barbecue oven when it is running at a preset test firepower based on the thermocouple corresponding to each grilling area, and to calculate the installation position temperature compensation coefficient of the grilling area based on the test temperature and the reference temperature. Furthermore, the method by which the acquisition module acquires the temperature of the grill rack of the gas-fired barbecue grill and obtains the set of grill rack temperatures corresponding to different acquisition times specifically includes: The initial temperature of the gas grill is collected at different sampling times based on the thermocouples of each grilling area, and the air temperature inside the oven cavity of the gas grill is collected based on the oven cavity temperature acquisition element of the gas grill. The initial area temperature is compensated based on the installation location temperature compensation coefficient of each of the baking mesh areas to obtain the area temperature of each of the baking mesh areas at different collection times.

[0015] As an optional implementation, in a second aspect of the invention, the temperature rise slope within the oven cavity includes the regional temperature rise slope of each of the baking grid areas; The device further includes: The first judgment module is used to determine, before the determining module controls the opening of the electromagnetic proportional valve corresponding to the baking grid area according to the target adjustment amount, whether the temperature rise slope of the baking grid area is continuously lower than the preset load slope threshold for each baking grid area. The calculation module is also used to determine that there is an additional food load in each of the grilling areas when the temperature rise slope of a certain grilling area is continuously lower than the load slope threshold, and to calculate the firepower compensation coefficient based on the average temperature field and the temperature deviation value corresponding to the grilling area. The firepower compensation coefficient is used to superimpose the target adjustment amount of all electromagnetic proportional valves in the grilling area.

[0016] As an optional implementation, in the second aspect of the present invention, the calculation module calculates the temperature rise slope inside the oven cavity of the gas grill based on the air temperature inside the oven cavity at each acquisition time, and determines whether the temperature rise slope inside the oven cavity is greater than a preset slope threshold. Specifically, this includes: The furnace cavity air temperature at each acquisition time is fitted according to the time sequence to obtain the furnace cavity temperature change curve, and the furnace cavity temperature change curve is differentiated to obtain the furnace cavity temperature rise slope at the current time. The opening data of the electromagnetic proportional valve corresponding to each grilling area of ​​the gas grill is obtained, and it is determined whether the temperature rise slope in the oven cavity is greater than a preset slope threshold and whether the opening data of each electromagnetic proportional valve is within a preset stable range. When the temperature rise slope in the oven cavity is greater than the slope threshold and the opening data of each electromagnetic proportional valve is within the stable range, it is determined that the gas grill is in the braising mode, and the operation of calculating the average temperature field of the gas grill based on the regional temperature of each grill area is triggered. When the temperature rise slope in the oven cavity is less than or equal to the slope threshold, and / or when the opening data of each electromagnetic proportional valve is outside the stable range, it is determined that the gas grill is not in the simmering mode, and the acquisition module is triggered to perform the operation of acquiring the grill temperature of the gas grill.

[0017] As an optional implementation, in a second aspect of the present invention, the calculation module calculates the average temperature field of the gas grill based on the regional temperature of each grilling area, and calculates the temperature deviation value corresponding to each grilling area based on the average temperature field and the regional temperature of each grilling area. Specifically, this includes: For each grilling area, a corresponding weighting coefficient is assigned to the grilling area according to the position information of the grilling area in the oven cavity of the gas grill, wherein the weighting coefficient of the edge area of ​​the oven cavity is lower than the weighting coefficient of the center area of ​​the oven cavity. The average temperature field of the gas-fired barbecue oven is calculated based on the regional temperature of each grilling area and the weighting coefficient of each grilling area. For each of the baking rack areas, the food load status data of the baking rack area is obtained, and the area temperature of the baking rack area is corrected according to the food load status data to obtain the corrected area temperature. Based on the corrected area temperature and the average temperature field, the temperature deviation value corresponding to the baking rack area is calculated.

[0018] As an optional implementation, in the second aspect of the present invention, the method by which the determining module determines the target adjustment amount of the PWM duty cycle corresponding to the grilling area based on the size relationship, and controls the opening degree of the electromagnetic proportional valve corresponding to the grilling area based on the target adjustment amount specifically includes: For each of the baking grid areas, the initial adjustment amount of the PWM duty cycle corresponding to the baking grid area is determined based on the temperature deviation value of the baking grid area and the magnitude relationship. Collect the gas pressure data of the gas grill, and perform pressure compensation correction on the initial adjustment amount of the PWM duty cycle corresponding to each grill area based on the gas pressure data to obtain the target adjustment amount of each grill area. For each of the baking grid areas, the PWM duty cycle corresponding to the baking grid area is adjusted according to the target adjustment amount corresponding to the baking grid area to obtain the adjusted PWM signal. The adjusted PWM signal is then converted into a drive current, and the drive current controls the electromagnetic proportional valve corresponding to the baking grid area to adjust to the target opening degree corresponding to the target adjustment amount according to a preset step size. Wherein, when the magnitude relationship indicates that the temperature deviation value of the baking griddle area is greater than the maximum error threshold corresponding to the allowable error range, the target adjustment amount indicates the amount of reduction of the PWM duty cycle to reduce the opening of the electromagnetic proportional valve corresponding to the baking griddle area; when the magnitude relationship indicates that the temperature deviation value of the baking griddle area is less than the minimum error threshold corresponding to the allowable error range, the target adjustment amount indicates the amount of increase of the PWM duty cycle to increase the opening of the electromagnetic proportional valve corresponding to the baking griddle area.

[0019] As an optional implementation, in a second aspect of the invention, the apparatus further includes: The second judgment module is used to determine whether the temperature rise slope in the furnace cavity is greater than the preset dry burning threshold when the temperature rise slope in the furnace cavity is greater than the slope threshold. When the temperature rise slope in the furnace cavity is greater than the dry burning threshold, the PWM duty cycle corresponding to each baking grid area is reduced to below the preset safety threshold, and a dry burning warning prompt is output. The first recording module is used to record the adjustment data of each of the baking grid areas and generate a gas nozzle carbon deposit warning information when the temperature deviation value of the baking grid area is outside the allowable error range after the PWM duty cycle of the baking grid area has been adjusted for a preset number of consecutive times.

[0020] As an optional implementation, in a second aspect of the present invention, the acquisition module is further configured to acquire residual heat temperature data of each of the grilling areas within the oven cavity of the gas grill when it is detected that the gas grill has exited the braising mode; The determining module is further configured to determine the closing parameters of the electromagnetic proportional valve corresponding to each of the baking grid areas based on the residual heat temperature data of each baking grid area, and control the corresponding electromagnetic proportional valve to perform a closing operation based on the closing parameters. The closing parameters include closing timing control parameters and closing rate control parameters. The device further includes: The second recording module is used to record all data when the gas grill is in the braising mode, and to iteratively update the slope threshold and the allowable error range based on the all data, and store the all data and the updated slope threshold and the allowable error range in the database.

[0021] A third aspect of the present invention discloses another heat field leveling control device for a multi-burner gas grill, the device comprising: Memory containing executable program code; A processor coupled to the memory; The processor calls the executable program code stored in the memory to execute some or all of the steps in the heat field leveling control method for a multi-burner gas barbecue oven according to any of the first aspects of the present invention.

[0022] The fourth aspect of the present invention discloses a computer storage medium storing computer instructions, which, when invoked, are used to execute some or all of the steps in the heat field leveling control method for a multi-burner gas grill as described in any of the first aspects of the present invention.

[0023] Compared with the prior art, the present invention has the following beneficial effects: In this embodiment of the invention, the temperature of the grill rack of the gas grill is collected to obtain a set of grill rack temperatures corresponding to different collection times. Based on the air temperature inside the oven cavity at each collection time, the temperature rise slope inside the gas grill cavity is calculated, and it is determined whether the temperature rise slope inside the oven cavity is greater than a preset slope threshold. When the temperature rise slope inside the oven cavity is greater than the slope threshold, the average temperature field of the gas grill is calculated based on the regional temperature of each grill rack area. Based on the average temperature field and the regional temperature of each grill rack area, the temperature deviation value corresponding to each grill rack area is calculated. For each grill rack area, the relationship between the temperature deviation value of the grill rack area and the preset allowable error range is determined. Based on the relationship, the target adjustment amount of the PWM duty cycle corresponding to the grill rack area is determined, and the opening of the electromagnetic proportional valve corresponding to the grill rack area is controlled according to the target adjustment amount. It can be seen that implementing this invention can achieve targeted differentiated firepower compensation for each area, improve the uniformity of the oven cavity temperature field of the multi-burner gas grill in the braising mode, improve the accuracy of temperature regulation, ensure uniform heating of food, improve the quality of food grilling, reduce the difficulty of user operation, and enhance the user experience and intelligence level of the equipment. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic flowchart of a method for controlling the thermal field leveling of a multi-burner gas barbecue grill disclosed in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a constant current drive control circuit disclosed in an embodiment of the present invention; Figure 3 This is a flowchart illustrating another method for controlling the thermal field leveling of a multi-burner gas grill disclosed in an embodiment of the present invention. Figure 4 This is a schematic diagram of the structure of a heat field leveling control device for a multi-burner gas barbecue grill disclosed in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of another heat field leveling control device for a multi-burner gas barbecue grill disclosed in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of a heat field leveling control device for a multi-burner gas barbecue grill disclosed in an embodiment of the present invention. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, apparatus, product, or end that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or ends.

[0028] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0029] This invention discloses a method and device for thermal field leveling control of a multi-burner gas grill, which can achieve targeted differentiated heat compensation in different areas, improve the uniformity of the oven cavity temperature field in the stewing mode, improve the accuracy of temperature regulation, ensure uniform heating of food, improve the quality of food grilling, reduce the difficulty of user operation, and enhance the user experience and intelligence level of the equipment. Detailed descriptions follow.

[0030] Example 1 Please see Figure 1 , Figure 1This is a flowchart illustrating a method for heat field leveling control of a multi-burner gas grill disclosed in an embodiment of the present invention. Figure 1 The described method for thermal field leveling control of a multi-burner gas grill can be applied to multi-burner gas grills. The multi-burner gas grill may include multiple gas burners, which can achieve thermal field leveling control of multiple grilling areas within the grill cavity. The multi-burner gas grill may include a thermal field leveling control device, which may include an intelligent server or intelligent platform for achieving thermal field leveling control. The intelligent server may include a local server or a cloud server; this embodiment of the invention is not limited to this. Figure 1 As shown, the thermal field leveling control method for this multi-burner gas grill may include the following operations: 101. Collect the temperature of the grill rack of the gas barbecue grill to obtain the set of grill rack temperatures corresponding to different collection times.

[0031] In this embodiment of the invention, optionally, the temperature of the grill rack of the gas-fired barbecue oven can be collected in real time and in a distributed manner. The collection period can be set to 0.5-2 seconds according to the control accuracy requirements, and the grill rack temperature sets corresponding to different collection times are obtained. The grill rack temperature set is a structured temperature data set, including the regional temperature of at least one grill rack area and the air temperature inside the oven cavity of the gas-fired barbecue oven. Each grill rack area includes two independent electromagnetic proportional valves, and all electromagnetic proportional valves in each grill rack area share a single temperature sensor for feedback control. The division of the grill rack areas matches the number of oven heads one-to-one; for example, three oven heads correspond to three grill rack areas: left, center, and right. Each grill rack area is an independent grilling unit, corresponding to one oven head and an independent heat adjustment component, i.e., an electromagnetic proportional valve. The air temperature inside the oven cavity is collected from the central area of ​​the oven cavity where there is no direct open flame, representing the overall ambient temperature state of the oven cavity.

[0032] In this embodiment of the invention, optionally, the zone temperature can be collected by a K-type thermocouple fixedly arranged below each baking grid area, and the air temperature inside the oven cavity can be collected by a dedicated oven cavity temperature collection element arranged at a preset position on the inner wall of the oven cavity. Both types of collection elements have the characteristics of high temperature resistance and heat radiation resistance, and the collection accuracy can reach ±0.5℃.

[0033] 102. Based on the air temperature inside the oven cavity at each collection time, calculate the temperature rise slope inside the oven cavity of the gas barbecue oven, and determine whether the temperature rise slope inside the oven cavity is greater than the preset slope threshold.

[0034] In this embodiment of the invention, optionally, the temperature rise slope inside the furnace cavity is used to characterize the rate of change of the air temperature inside the furnace cavity with time. The temperature rise slope inside the furnace cavity can be calculated by fitting a curve and performing derivative calculations, or it can be calculated using a slope calculation formula, which is: Where k represents the temperature rise slope inside the furnace cavity, This represents the temperature difference of the air inside the furnace cavity at adjacent sampling times. This indicates the time interval between adjacent data collection moments.

[0035] In this embodiment of the invention, optionally, the preset slope threshold can be preset according to the oven cavity volume and rated heating power of the barbecue oven, with a conventional value of 3-8℃ / min, which can be iteratively optimized according to the actual usage scenario; and, the temperature rise slope in the oven cavity can be used to determine whether the gas barbecue oven is in the simmering mode. The core feature of the simmering mode is that the oven cavity is in a relatively sealed state after the lid is closed, and the air temperature in the oven cavity will rise rapidly and continuously, which is manifested as a significant increase in the temperature rise slope. Therefore, by comparing the temperature rise slope with the slope threshold, the simmering mode can be initially identified, providing triggering conditions for subsequent thermal field leveling adjustment.

[0036] 103. When the temperature rise slope in the oven cavity is greater than the slope threshold, calculate the average temperature field of the gas grill oven based on the regional temperature of each grilling area, and calculate the temperature deviation value corresponding to each grilling area based on the average temperature field and the regional temperature of each grilling area.

[0037] In this embodiment of the invention, optionally, when the temperature rise slope inside the oven cavity is determined to be greater than a preset slope threshold, a heat field leveling adjustment process in the braising mode is triggered. First, the average temperature field value of the oven cavity is calculated, and then the temperature deviation value of each grill area is calculated based on the average temperature field value. Specifically, the average temperature field value of the gas grill can be calculated using an arithmetic mean method based on the regional temperature of each grill area, representing the overall reference temperature level of the oven cavity. The formula for calculating the average temperature field value includes:

[0038] in, This represents the average temperature field value. This represents the temperature of the i-th baking rack region, and n represents the number of baking rack regions. Using the average temperature field as a benchmark, the difference between the regional temperature and the average temperature field for each baking rack area is calculated to obtain the temperature deviation value corresponding to each baking rack area. The calculation formula includes:

[0039] in, This represents the temperature deviation value of the i-th baking rack area. The sign of the temperature deviation value indicates whether the temperature of the baking rack area is higher or lower than the oven cavity reference. A positive value indicates that the temperature is too high, and a negative value indicates that the temperature is too low. The absolute value of the deviation value indicates the degree of temperature deviation.

[0040] 104. For each baking rack area, determine the relationship between the temperature deviation value of the baking rack area and the preset allowable error range. Based on the relationship, determine the target adjustment amount of the PWM duty cycle corresponding to the baking rack area, and control the opening degree of the electromagnetic proportional valve corresponding to the baking rack area according to the target adjustment amount.

[0041] In this embodiment of the invention, optionally, differentiated heat adjustment operations can be performed on different grilling areas of the gas grill based on the temperature deviation value of each grilling area, so as to achieve thermal field leveling control of the multi-burner gas grill. Specifically: the relationship between the temperature deviation value of the grilling area and a preset allowable error range can be determined. The allowable error range is the reasonable deviation range of the temperature of each area of ​​the grilling area, preset according to the temperature accuracy requirements of the food being grilled, and conventionally taken as ±2-5℃; then, based on the relationship, the target adjustment amount of the PWM duty cycle corresponding to the grilling area is determined, and then the opening of the electromagnetic proportional valve corresponding to the grilling area is controlled according to the target adjustment amount. When the temperature deviation value exceeds the upper limit of the allowable error range, the PWM duty cycle is reduced, the opening of the electromagnetic proportional valve is reduced, the gas intake is reduced, and the heat of the area is reduced; when the temperature deviation value exceeds the lower limit of the allowable error range, the PWM duty cycle is increased, the opening of the electromagnetic proportional valve is increased, the gas intake is increased, and the heat of the area is increased.

[0042] In this embodiment of the invention, optionally, the opening degree of the electromagnetic proportional valve can be controlled by a constant current drive control circuit. The constant current drive control circuit can automatically compensate for resistance changes in the electromagnetic proportional valve caused by coil heating or other reasons, ensuring the accuracy and stability of the firepower output. Please refer to [link / reference]. Figure 2 , Figure 2 This is a schematic diagram of a constant current drive control circuit disclosed in an embodiment of the present invention; as shown below. Figure 2 As shown, a high-precision sampling resistor group (including, for example, ...) is connected in series at the output terminal (P-VBN) of the proportional valve drive circuit in the constant current drive control circuit. Figure 2The first resistor R98 and the second resistor R99 shown convert the actual current flowing through the proportional valve coil into a feedback voltage in real time, and input it to the inverting input of the comparator U5B via the third resistor R50. This structure, together with the DO-VB reference signal (i.e. the drive control signal mentioned above) output by the MCU (i.e. the main control module 101 mentioned above), forms a hardware-level closed-loop constant current control, which eliminates the influence of the solenoid valve coil resistance drift with temperature on the firepower accuracy; and, through closed-loop constant current control, it can automatically compensate for the resistance change of the proportional valve caused by coil heating or other reasons, ensuring the accuracy and stability of the firepower output.

[0043] It is evident that implementation Figure 1 The described thermal field leveling control method for a multi-burner gas grill can collect the grill rack temperature of the gas grill, obtaining a set of grill rack temperatures corresponding to different collection times. Based on the air temperature inside the oven cavity at each collection time, the method calculates the temperature rise slope inside the oven cavity and determines whether the temperature rise slope inside the oven cavity is greater than a preset slope threshold. When the temperature rise slope inside the oven cavity is greater than the slope threshold, the method calculates the average temperature field of the gas grill based on the area temperature of each grill rack area, and calculates the temperature deviation value corresponding to each grill rack area based on the average temperature field and the area temperature of each grill rack area. For each grilling area, the relationship between the temperature deviation value of that grilling area and the preset allowable error range is determined. Based on this relationship, the target adjustment amount of the PWM duty cycle corresponding to that grilling area is determined, and the opening of the electromagnetic proportional valve corresponding to that grilling area is controlled according to the target adjustment amount. This enables targeted differentiated heat compensation for each area, improves the uniformity of the oven cavity temperature field in the simmering mode of the multi-burner gas grill, improves the accuracy of temperature regulation, ensures uniform heating of food, improves the quality of food grilling, reduces the difficulty of user operation, and enhances the user experience and intelligence level of the equipment.

[0044] In an optional embodiment, the temperature rise slope within the oven cavity includes the regional temperature rise slope for each baking grid area; Before controlling the opening of the electromagnetic proportional valve corresponding to the grill area according to the target adjustment amount, the heat field leveling control method of the multi-burner gas grill may also include the following operations: For each baking grid area, determine whether the temperature rise slope of that baking grid area is consistently lower than the preset load slope threshold. For each grilling area, when the temperature rise slope of a grilling area is continuously lower than the load slope threshold, it is determined that there is an additional food load in the grilling area. Based on the average temperature field and the corresponding temperature deviation value of the grilling area, the firepower compensation coefficient is calculated. The firepower compensation coefficient is used to superimpose the target adjustment amount of all electromagnetic proportional valves in the grilling area.

[0045] In this optional embodiment, the temperature rise slope within the oven cavity may optionally include the regional temperature rise slope of each grilling area, which represents the rate of change of the regional temperature of each grilling area with the time of data collection. For each grilling area, the regional temperature rise slope at each continuous data collection moment is extracted in real time, and it is determined whether the regional temperature rise slope is continuously lower than a preset load slope threshold. The load slope threshold is a critical slope value characterizing the presence of heat absorption by food in the grilling area. It is preset based on the heating power of the gas grill head and the heat absorption characteristics of common foods, and is typically set to 0-2℃ / min. This threshold is far lower than the normal regional temperature rise slope in the braising mode. The condition of continuously being lower than the threshold represents the time dimension, and the preset duration is 3-5 data collection cycles to avoid misjudgments caused by instantaneous temperature fluctuations and ensure the accuracy of the judgment results.

[0046] In this optional embodiment, optionally, for each grilling area, when the temperature rise slope of the grilling area is continuously lower than the load slope threshold for a preset duration, it is directly determined that there is a new food load in the grilling area. The determination logic is as follows: In the braising mode, the oven cavity is in a closed heating state. If there is no new food, the temperature of the grilling area should rise synchronously with the entire oven cavity, and the temperature rise slope should remain within a reasonable range. However, when new food is added to the area, the food will quickly absorb the heat from the grilling area, causing the temperature rise rate of the grilling area to drop sharply, or even experience a brief cooling, which is manifested as the temperature rise slope remaining at a low level. This allows for accurate and rapid identification of new food operations in local areas. When it is determined that there is a new food load in a certain grilling area, a specific heat compensation coefficient is immediately calculated based on the average temperature field of the oven cavity and the corresponding temperature deviation value of the grilling area. The heat compensation coefficient is a proportional coefficient greater than 1, used to compensate for the heat loss in the grilling area caused by the heat absorption of the new food. The calculation formula is as follows:

[0047] in, This represents the firepower compensation coefficient. This represents the temperature deviation value of the i-th baking griddle area. This represents the average temperature field value. The larger the absolute value of the temperature deviation, the greater the difference between this area and the oven cavity reference temperature, indicating more heat loss due to food absorption. Therefore, a larger heat compensation coefficient is needed to ensure the compensation level matches the heat loss. The calculated heat compensation coefficient is directly added to the target adjustment value of the electromagnetic proportional valve corresponding to this grilling area. That is, the actual adjustment value after addition = original target adjustment value × heat compensation coefficient. By amplifying the target adjustment value, additional heat compensation is achieved for this area, quickly replenishing the heat consumed by the food absorption and preventing the oven cavity temperature field from becoming unbalanced due to persistently low temperatures in this area.

[0048] As can be seen, implementing this optional embodiment can refine the temperature rise slope in the oven cavity into the regional temperature rise slope of each grilling area, accurately capture the temperature change trend of each grilling area, and continuously monitor the regional temperature rise slope of each grilling area before controlling the opening of the electromagnetic proportional valve and determine whether it is lower than the load slope threshold. When it is determined that there is an additional food load in the grilling area, the firepower compensation coefficient is calculated in time and superimposed on the target adjustment amount of that area. It can accurately and quickly identify the additional food operation in local areas during the braising process, and perform additional firepower compensation in a targeted manner, effectively making up for the heat loss caused by the heat absorption of the additional food, avoiding sudden imbalance of the oven cavity temperature field caused by a sudden drop in temperature in local areas, improving the adaptability of the thermal field leveling control to dynamic baking conditions, further improving the timeliness and accuracy of firepower adjustment, maintaining the uniformity of the oven cavity temperature field in the braising mode, ensuring that the food is heated evenly, and improving the baking quality of the food.

[0049] In another optional embodiment, calculating the temperature rise slope inside the gas grill cavity based on the air temperature inside the cavity at each sampling time, and determining whether the temperature rise slope inside the cavity is greater than a preset slope threshold, may include the following operations: The furnace cavity air temperature at each acquisition moment is fitted according to the time sequence to obtain the furnace cavity temperature change curve. The derivative of the furnace cavity temperature change curve is calculated to obtain the furnace cavity temperature rise slope at the current moment. The opening data of the electromagnetic proportional valve corresponding to each grilling area of ​​the gas grill is obtained, and it is determined whether the temperature rise slope in the oven cavity is greater than the preset slope threshold and whether the opening data of each electromagnetic proportional valve is within the preset stable range. When the temperature rise slope in the oven cavity is greater than the slope threshold and the opening data of each electromagnetic proportional valve is within the stable range, it is determined that the gas grill is in the braising mode, and the operation of calculating the average temperature field of the gas grill based on the regional temperature of each grill area is triggered. When the temperature rise slope in the oven cavity is less than or equal to the slope threshold, and / or when the opening data of each electromagnetic proportional valve is outside the stable range, it is determined that the gas grill is not in the simmering mode, and the operation of collecting the grill temperature of the gas grill continues.

[0050] In this optional embodiment, optionally, the oven cavity air temperature data at each acquisition moment is first fitted with a polynomial according to the chronological order to obtain a smooth oven cavity temperature change curve. During the fitting process, abnormal extreme values ​​in the acquired data can be eliminated by the 3σ principle to avoid the influence of single acquisition error on the curve trend. Then, the first derivative of the fitted oven cavity temperature change curve is calculated to obtain the oven cavity temperature rise slope at the current moment. Compared with the slope calculated directly from the temperature at adjacent moments, the temperature rise slope obtained by curve fitting and differentiation can better reflect the continuous change trend of oven cavity temperature, avoid slope calculation deviation caused by instantaneous temperature fluctuations, and improve the accuracy of the braising mode recognition.

[0051] In this optional embodiment, the opening data of the electromagnetic proportional valve corresponding to each grilling area of ​​the gas grill can be acquired in real time. The opening data is the real-time gas intake opening value of the electromagnetic proportional valve, representing the current firepower status of each burner. The opening data can be collected in real time by the main control module of the grill, and the acquisition accuracy matches the adjustment accuracy of the electromagnetic proportional valve, typically reaching ±1%. It is determined whether the temperature rise slope in the oven cavity is greater than a preset slope threshold, and whether the opening data of each electromagnetic proportional valve is within a preset stable range. The stable range is the reasonable fluctuation range of the electromagnetic proportional valve opening, which can be preset to ±5% of the rated opening, indicating that the firepower of each burner is in a stable state, without manual adjustment or sudden changes in firepower.

[0052] In this optional embodiment, optionally, when the temperature rise slope in the oven cavity is greater than the slope threshold and the opening data of each electromagnetic proportional valve is within the stable range, it is determined that the gas grill is in the braising mode, and the operation of calculating the average temperature field of the gas grill based on the regional temperature of each grill area is triggered, and the closed-loop adjustment of the thermal field leveling in the braising mode is started; when the temperature rise slope in the oven cavity is less than or equal to the slope threshold, and / or when the opening data of each electromagnetic proportional valve is outside the stable range, it is determined that the gas grill is not in the braising mode, such as when grilling with the lid open, adjusting the firepower, or adding ingredients, etc., at this time, no thermal field leveling adjustment operation is performed, and the operation of collecting the grill temperature of the gas grill continues to be performed to keep the current firepower state of each burner unchanged until both conditions are met.

[0053] As can be seen, implementing this optional embodiment can obtain a precise temperature rise slope in the oven cavity through curve fitting and differentiation. It can also combine the electromagnetic proportional valve opening data to make a comprehensive judgment on the braising mode, effectively avoiding misjudgment of the braising mode caused by instantaneous temperature fluctuations and manual heat adjustment. This improves the accuracy and rigor of braising mode identification, ensures that the thermal field leveling adjustment is only performed in scenarios that meet the braising conditions, avoids ineffective adjustment in non-braising states, and improves the pertinence and execution efficiency of the control method.

[0054] In another optional embodiment, calculating the average temperature field of the gas grill based on the regional temperature of each grilling area, and calculating the temperature deviation value corresponding to each grilling area based on the average temperature field and the regional temperature of each grilling area, may include the following operations: For each grilling area, a corresponding weighting coefficient is assigned to the grilling area based on its position information within the oven cavity of the gas grill. The weighting coefficient of the edge area of ​​the oven cavity is lower than that of the center area of ​​the oven cavity. The average temperature field of the gas grill is calculated by taking the regional temperature of each grilling area and the weighting coefficient of each grilling area. For each grilling area, the food load status data of that grilling area is obtained, and the area temperature of the grilling area is corrected based on the food load status data to obtain the corrected area temperature. Based on the corrected area temperature and the average temperature field, the corresponding temperature deviation value of the grilling area is calculated.

[0055] In this optional embodiment, for each grilling area, a unique weighting coefficient can be assigned based on its position within the gas grill cavity. Specifically, the weighting coefficient allocation follows the principle that the center area of ​​the cavity is higher than the edge area: the grilling area in the center of the cavity is evenly heated by the open flame, has concentrated heat radiation from the cavity, and is less affected by heat dissipation, so its temperature can more accurately represent the overall temperature field state of the cavity, and is assigned a higher weighting coefficient, typically 0.3-0.5; the grilling area at the edge of the cavity is affected by heat dissipation from the inner wall of the cavity, uneven heating by the open flame, and weaker heat radiation, so its temperature is less representative and is assigned a lower weighting coefficient, typically 0.1-0.2; the sum of the weighting coefficients of all grilling areas is 1, ensuring that the calculation of the average temperature field is a normalized weighted calculation, avoiding evaluation bias caused by weight imbalance.

[0056] In this optional embodiment, the average temperature field of the gas grill is calculated by weighting and summing the regional temperatures of each grill area based on their corresponding weighting coefficients. The calculation formula is as follows:

[0057] in, This represents the average temperature field value. This represents the temperature of the i-th baking area. represents the weight coefficient of the i-th grilling region, and n represents the number of grilling regions.

[0058] In this optional embodiment, optionally, for each grill area, the load state data of the ingredients in this area can be collected through the weight sensor and infrared recognition sensor provided with the barbecue grill. The core can include two key parameters, namely the weight of the ingredients and the covered area of the ingredients, which characterize the baking load of the ingredients in this area. The original area temperature of this grill area can be corrected according to the load state data of the ingredients. Specifically, the greater the weight of the ingredients and the wider the covered area, the stronger the heat absorption ability of the ingredients, the greater the difference between the actual temperature of the grill and the temperature collected by the thermocouple, and the smaller the corresponding temperature correction coefficient. The corrected area temperature is calculated through the correction coefficient. Since the thermocouple collects the grill temperature, when ingredients are placed on the grill, the ingredients will absorb a large amount of heat, resulting in the grill temperature being lower than the temperature without ingredients. If the original area temperature is directly used to calculate the deviation value, it will lead to incorrect judgment of the firepower adjustment. Therefore, the correction of the load state of the ingredients can improve the accuracy of the deviation calculation. The temperature deviation value corresponding to this grill area can be calculated based on the corrected area temperature of each grill area and the average temperature field obtained by the aforementioned weighted calculation.

[0059] It can be seen that implementing this optional embodiment can allocate corresponding weight coefficients according to the position information of the grill area in the furnace cavity and calculate the weighted average temperature field. It can also calculate the temperature deviation value after correcting the grill area temperature in combination with the load state data of the ingredients, making the average temperature field more conform to the actual temperature distribution characteristics of the furnace cavity, eliminating the influence of ingredient heat absorption on temperature collection, improving the accuracy of the temperature deviation value calculation, making the basis for subsequent firepower adjustment more conform to the actual baking requirements, and further improving the scientificity and adaptability of the thermal field leveling adjustment.

[0060] In another optional embodiment, determining the target adjustment amount of the PWM duty cycle corresponding to this grill area according to the size relationship and controlling the opening degree of the electromagnetic proportional valve corresponding to this grill area according to the target adjustment amount can include the following operations: For each grill area, determine the initial adjustment amount of the PWM duty cycle corresponding to this grill area according to the temperature deviation value of this grill area and the size relationship; Collect the gas pressure data of the gas barbecue grill, and perform pressure compensation correction on the initial adjustment amount of the PWM duty cycle corresponding to each grill area according to the gas pressure data to obtain the target adjustment amount of each grill area; For each grill area, adjust the PWM duty cycle corresponding to this grill area according to the target adjustment amount corresponding to this grill area to obtain the adjusted PWM signal, and convert the adjusted PWM signal into a driving current. Control the electromagnetic proportional valve corresponding to this grill area to adjust to the target opening degree corresponding to the target adjustment amount according to the preset step length; Specifically, when the magnitude relationship indicates that the temperature deviation value of the baking grid area is greater than the maximum error threshold corresponding to the allowable error range, the target adjustment amount represents the amount of reduction in the PWM duty cycle to reduce the opening of the electromagnetic proportional valve corresponding to the baking grid area; when the magnitude relationship indicates that the temperature deviation value of the baking grid area is less than the minimum error threshold corresponding to the allowable error range, the target adjustment amount represents the amount of increase in the PWM duty cycle to increase the opening of the electromagnetic proportional valve corresponding to the baking grid area.

[0061] In this optional embodiment, for each grilling area, the initial adjustment amount of the PWM duty cycle corresponding to that area is calculated using a PID control algorithm based on the corrected temperature deviation value of that grilling area and its relationship with the allowable error range. The proportional (P), integral (I), and derivative (D) parameters of the PID control algorithm are preset according to the grill's burner power, electromagnetic proportional valve adjustment characteristics, and gas combustion characteristics. The P parameter is used for rapid response to temperature deviation, the I parameter is used to eliminate static deviation, and the D parameter is used to suppress temperature overshoot. The initial adjustment amount calculated by the PID algorithm can achieve accurate and rapid response to temperature deviation, avoiding the adjustment lag or overshoot problems caused by single proportional adjustment.

[0062] In this optional embodiment, a gas pressure sensor installed on the gas intake pipe of the grill can be used to collect real-time gas pressure data of the grill to characterize the current gas supply pressure status. Since gas pressure fluctuations directly affect the matching relationship between the opening of the electromagnetic proportional valve and the actual heat output, for example, at the same opening, a higher gas pressure results in a higher actual heat output, and a lower pressure results in a lower actual heat output. Therefore, based on the collected gas pressure data, the initial adjustment amount of the PWM duty cycle corresponding to each grill area is adjusted by pressure compensation. When the gas pressure is higher than the rated pressure, the initial adjustment amount is appropriately reduced; when the gas pressure is lower than the rated pressure, the initial adjustment amount is appropriately increased. After correction, the target adjustment amount of the PWM duty cycle corresponding to each grill area is obtained, ensuring that the adjustment amount is accurately matched with the actual heat output requirements.

[0063] In this optional embodiment, for each grilling area, the PWM duty cycle can be adjusted in real time according to its corresponding target adjustment amount. When the target adjustment amount decreases, the PWM duty cycle is reduced; when the target adjustment amount increases, the PWM duty cycle is increased. The adjusted PWM signal is transmitted to the LM393 constant current drive circuit, which converts the PWM signal into a constant DC drive current to achieve fine current control of the electromagnetic proportional valve, thereby realizing minute-level adjustment of the heat output and meeting the high-precision requirements of thermal field leveling. Through the constant drive current, the electromagnetic proportional valve corresponding to the grilling area is controlled to adjust to the target opening degree corresponding to the target adjustment amount according to a preset step size. The preset step size is the single opening adjustment amount of the electromagnetic proportional valve, which is typically 2%-5% / step, that is, only 2%-5% of the opening degree is adjusted each time, rather than adjusting to the target opening degree all at once. After each adjustment step size, a preset buffer time (such as 0.5-1 second) can be paused to monitor the temperature change trend of the grilling area before the next step size adjustment is performed until the target opening degree is reached. Step-by-step opening control can effectively avoid sudden increases or decreases in firepower caused by abrupt changes in the opening of the electromagnetic proportional valve, prevent large fluctuations in the furnace temperature field, and ensure the stability of temperature field leveling adjustment.

[0064] In this optional embodiment, when the magnitude relationship indicates that the temperature deviation value of the grilling area is greater than the maximum error threshold corresponding to the allowable error range, the target adjustment amount is a reduction in the PWM duty cycle. By reducing the PWM duty cycle, the drive current is reduced, thereby reducing the opening of the electromagnetic proportional valve corresponding to that area, reducing the gas intake, and reducing the firepower. When the magnitude relationship indicates that the temperature deviation value of the grilling area is less than the minimum error threshold corresponding to the allowable error range, the target adjustment amount is an increase in the PWM duty cycle. By increasing the PWM duty cycle, the drive current is increased, thereby increasing the opening of the electromagnetic proportional valve corresponding to that area, increasing the gas intake, and increasing the firepower.

[0065] As can be seen, implementing this optional embodiment can determine the initial adjustment amount of the PWM duty cycle by combining the temperature deviation value and its magnitude relationship. It can also compensate and correct the initial adjustment amount through gas pressure data to obtain the target adjustment amount. The adjusted PWM signal is converted into a drive current to control the electromagnetic proportional valve to adjust to the target opening by a preset step size. This can effectively offset the adjustment deviation caused by gas pressure fluctuations, achieve precise adjustment of the PWM duty cycle, and avoid furnace cavity temperature field oscillation caused by sudden changes in the opening of the electromagnetic proportional valve. This improves the accuracy and stability of the firepower adjustment, allowing the temperature of each grilling area to approach the average temperature field more quickly and steadily, further improving the furnace cavity temperature field leveling effect.

[0066] In yet another optional embodiment, the thermal field leveling control method for the multi-burner gas grill may further include the following operations: When the temperature rise slope in the furnace cavity is greater than the slope threshold, it is determined whether the temperature rise slope in the furnace cavity is greater than the preset dry burning threshold. When the temperature rise slope in the furnace cavity is greater than the dry burning threshold, the PWM duty cycle corresponding to each baking area is reduced to below the preset safety threshold, and a dry burning warning prompt is output. For each grilling area, after the PWM duty cycle of the grilling area is adjusted for a preset number of consecutive times, if the temperature deviation of the grilling area is outside the allowable error range, the adjustment data of the grilling area is recorded, and a gas nozzle carbon deposit warning message is generated.

[0067] In this optional embodiment, when the temperature rise slope in the oven cavity is greater than a preset slope threshold, and the gas grill is determined to have entered the braising mode, it can be further determined whether the temperature rise slope in the oven cavity is greater than a preset dry-burning threshold. The dry-burning threshold is a temperature change rate threshold that is much greater than the slope threshold, representing a dry-burning state where there is no food absorbing heat and the temperature rises sharply in the oven cavity. If it is determined that the temperature rise slope in the oven cavity is greater than the dry-burning threshold, an emergency control operation is immediately executed: the PWM duty cycle corresponding to each grilling area is reduced to below a preset safety threshold. The safety threshold is a PWM duty cycle threshold that can maintain a low temperature in the oven cavity, typically set at 10%-20%, significantly reducing the firepower of each burner and preventing equipment damage caused by dry burning from the root. While performing emergency firepower adjustment, a dry-burning warning can be output through the grill's buzzer, indicator light, and smart terminal push notifications. The buzzer can provide a continuous beeping warning, and the indicator light can provide a red flashing warning, ensuring that the user can promptly perceive the dry-burning state and take appropriate action (such as adding food or turning off the gas).

[0068] In this optional embodiment, for each grilling area, the number of times its PWM duty cycle is adjusted is counted in real time. Each time the PWM duty cycle of this area is adjusted, the count is incremented by 1. If, after a preset number of consecutive adjustments to the PWM duty cycle of this grilling area (typically 3-5 times), the temperature deviation value of this grilling area is still outside the allowable error range, it is determined that the gas nozzle corresponding to this area has a carbon buildup problem. The judgment logic is as follows: if there is no carbon buildup in the nozzle, after 3-5 PID adjustments, the temperature deviation value should quickly enter the allowable error range. If it still exceeds the range, it indicates that carbon buildup in the nozzle is causing a mismatch between the gas intake volume and the adjustment command, resulting in a failure of firepower adjustment. When carbon buildup in the nozzle is determined, all adjustment data for this grilling area is first recorded, including the adjustment amount each time, the opening after adjustment, and the temperature change value, providing a reference for the user to clean the nozzle. Then, a gas nozzle carbon buildup warning message is generated through the grill's display panel, smart terminal push notifications, etc., clearly indicating "carbon buildup in a certain area of ​​the nozzle, please clean it in time," ensuring that the user can maintain the equipment in a timely manner and restore the accuracy of firepower adjustment.

[0069] As can be seen, implementing this optional embodiment can promptly reduce the PWM duty cycle and output a dry-burning warning when the temperature rise slope in the oven cavity exceeds the dry-burning threshold. It can also record adjustment data and generate nozzle carbon buildup warning information when the temperature deviation in the grill area still exceeds the allowable error range after a preset number of adjustments. This can effectively avoid equipment damage and safety hazards caused by dry burning in the oven cavity, while promptly detecting gas nozzle carbon buildup faults, reminding users to perform equipment maintenance, ensuring the safe and stable operation of the multi-burner gas grill, extending the service life of the equipment, and avoiding the failure of thermal field leveling adjustment due to faults, thus maintaining the temperature control accuracy of the equipment.

[0070] In yet another optional embodiment, the thermal field leveling control method for the multi-burner gas grill may further include the following operations: When the gas grill is detected to have exited the simmering mode, the residual heat temperature data of each grill area inside the oven cavity of the gas grill is collected. The closing parameters of the electromagnetic proportional valve corresponding to each baking area are determined based on the residual heat temperature data of each baking area, and the corresponding electromagnetic proportional valve is controlled to perform the closing operation according to the closing parameters. The closing parameters include closing timing control parameters and closing rate control parameters. Record all data when the gas grill is in the braising mode, iteratively update the slope threshold and allowable error range based on the full data, and store the full data and the updated slope threshold and allowable error range in the database.

[0071] In this optional embodiment, when the gas grill is detected to have exited the slow-roasting mode, residual heat temperature data for each grilling area within the oven cavity can be collected in real time. This residual heat temperature data represents the remaining temperature of the grilling area and oven cavity after the slow-roasting mode has exited, characterizing the residual heat status of each area. After collection, the data is stored according to grilling area classification. Based on the residual heat temperature data for each grilling area, specific closing parameters are determined for its corresponding electromagnetic proportional valve. These closing parameters include closing timing control parameters and closing rate control parameters. The closing timing control parameter is the start closing time of the electromagnetic proportional valve; areas with higher residual heat temperatures close earlier. The closing rate control parameter is the opening and closing rate of the electromagnetic proportional valve; areas with higher residual heat temperatures close faster, and areas with lower residual heat temperatures close slower. The determination of the closing parameters follows the principle that higher residual heat results in earlier and faster closing of the electromagnetic proportional valve, ensuring consistent residual heat temperature across all areas within the oven cavity, achieving efficient utilization of residual heat, and guaranteeing the quality of the grilled food.

[0072] In this optional embodiment, the electromagnetic proportional valves can be controlled to perform differentiated step-by-step closing operations according to the closing parameters of the electromagnetic proportional valves corresponding to each grilling area. Specifically, the closing process of the electromagnetic proportional valves in each area is started sequentially according to the closing timing control parameters. During the closing process, the opening degree of the electromagnetic proportional valves is gradually reduced at the corresponding rate according to the closing rate control parameters until they are completely closed, with no sudden changes in opening degree throughout the process, ensuring that residual heat is released slowly and that the food in each grilling area can be smoothly grilled.

[0073] In this optional embodiment, all operating data of the gas grill in the slow-roasting mode can be recorded, referred to as full data. This includes temperature data (area temperature, air temperature inside the oven cavity) at all collected times, PWM duty cycle adjustment data (initial adjustment amount, target adjustment amount, and adjustment value for each time), electromagnetic proportional valve opening data, temperature rise slope change data, safety warning data, etc. This data constitutes a complete operating record of the slow-roasting mode. Based on the recorded full data and combined with a preset self-learning algorithm, the slope threshold and allowable error range are iteratively optimized and updated. The self-learning algorithm can analyze the temperature change patterns in the full data and adjust the response speed accordingly. Regarding the temperature field leveling effect, if a high slope threshold is found to cause lag in the recognition of the braised grill mode, the slope threshold should be appropriately lowered; if a small allowable error range is found to cause excessive adjustments, the allowable error range should be appropriately increased, and vice versa. All data from this braised grilling session, along with the iteratively updated slope threshold and allowable error range, can be uniformly stored in the grill's local database or cloud database. This data can then be used as control parameters when the gas grill enters the braised grill mode next time, enabling self-learning and continuous optimization of the control method. This will make the parameters more suitable for the user's grilling habits, usage scenarios, and equipment status, thereby improving the accuracy and adaptability of subsequent temperature field leveling control.

[0074] As can be seen, implementing this optional embodiment can collect residual heat temperature data of each grilling area and determine the corresponding electromagnetic proportional valve closing parameters when the gas grill exits the slow grilling mode. It can also control the electromagnetic proportional valve to perform the closing operation according to the closing parameters, and record all data in the slow grilling mode and iteratively update the slope threshold and allowable error range. This can effectively avoid over-grilling of food caused by local residual heat accumulation in the oven cavity, further ensuring the quality of food grilling. At the same time, through data iterative updates, the control parameters are made more in line with the actual use status of the equipment and the grilling scenario, realizing the self-learning optimization of the control method and continuously improving the accuracy and adaptability of the heat field leveling control in the subsequent slow grilling mode.

[0075] Example 2 Please see Figure 3 , Figure 3 This is a flowchart illustrating a method for heat field leveling control of a multi-burner gas grill disclosed in an embodiment of the present invention. Figure 3 The described method for thermal field leveling control of a multi-burner gas grill can be applied to multi-burner gas grills. The multi-burner gas grill may include multiple gas burners, which can achieve thermal field leveling control of multiple grilling areas within the grill cavity. The multi-burner gas grill may include a thermal field leveling control device, which may include an intelligent server or intelligent platform for achieving thermal field leveling control. The intelligent server may include a local server or a cloud server; this embodiment of the invention is not limited to this. Figure 3 As shown, the thermal field leveling control method for this multi-burner gas grill may include the following operations: 201. Before the gas grill is put into operation, the current ambient temperature of the gas grill is collected based on the thermocouple corresponding to each grilling area, and a reference temperature is determined based on the collected current ambient temperature.

[0076] Optionally, in this embodiment of the invention, before the gas grill is started, the ambient temperature can be collected under no-load conditions based on the thermocouples corresponding to each grill area. Each thermocouple corresponds to an ambient temperature collection value. All collection values ​​are arithmetically averaged to obtain a unified reference temperature. The reference temperature serves as the zero-point reference for thermocouple temperature collection and is used to correct zero-point offset errors caused by the thermocouple manufacturing process and long-term use, ensuring that the temperature data collected by the thermocouples is consistent with the actual temperature. This invention does not impose any limitations.

[0077] 202. For each grilling area, the test temperature of the gas grill is collected based on the thermocouple corresponding to the grilling area when the gas grill is running at the preset test firepower, and the installation position temperature compensation coefficient of the grilling area is calculated based on the test temperature and the reference temperature.

[0078] In this embodiment of the invention, optionally, for each grilling area, the gas grill is first controlled to operate under no-load at a preset test firepower. This test firepower is a fixed firepower value, preferably 50% of the grill's rated firepower, to reduce the sampling deviation caused by excessive or insufficient firepower. Then, the grilling area's test temperature is collected using the thermocouple corresponding to that grilling area. Finally, based on the test temperature and the aforementioned reference temperature, the installation location temperature compensation coefficient for that grilling area is calculated using the following formula:

[0079] in, This indicates the temperature compensation coefficient at the installation location. Indicates the reference temperature. Indicates the test temperature; Because different heating grid areas are installed in different positions within the oven cavity, they are affected by direct flame heating, heat radiation, and oven cavity heat dissipation to varying degrees. Even under the same heat, the temperatures collected by thermocouples in each area will deviate. The installation position temperature compensation coefficient can specifically correct such positional deviations, making the temperature collection data of each area comparable.

[0080] 203. The initial zone temperature of the gas grill is collected at different collection times based on the thermocouples of each grilling area, and the air temperature inside the gas grill cavity is collected based on the oven cavity temperature collection element of the gas grill.

[0081] In this embodiment of the invention, optionally, the initial temperature of the grilling area of ​​the barbecue oven at different sampling times can be collected in real time based on the thermocouple of each grilling area, and the air temperature inside the oven cavity at the corresponding time can be collected synchronously based on the oven cavity temperature acquisition element of the gas barbecue oven.

[0082] 204. The initial area temperature is compensated according to the installation location temperature compensation coefficient of each baking mesh area to obtain the area temperature of each baking mesh area at different collection times.

[0083] In this embodiment of the invention, optionally, the initial temperature of the corresponding area can be compensated and corrected based on the pre-calculated installation position temperature compensation coefficient for each baking grid area. The calculation formula is as follows:

[0084] in, This indicates the compensated regional temperature. Indicates the initial region temperature; The compensated temperature of each baking grid area at different acquisition times can be combined with the synchronously acquired air temperature inside the oven cavity according to the acquisition time to form a structured baking grid temperature set. This set is accurate temperature data after error correction and serves as the sole data basis for subsequent temperature rise slope calculation and temperature field deviation analysis.

[0085] 205. Based on the air temperature inside the oven cavity at each collection time, calculate the temperature rise slope inside the oven cavity of the gas barbecue oven, and determine whether the temperature rise slope inside the oven cavity is greater than the preset slope threshold.

[0086] 206. When the temperature rise slope in the oven cavity is greater than the slope threshold, calculate the average temperature field of the gas grill oven based on the regional temperature of each grilling area, and calculate the temperature deviation value corresponding to each grilling area based on the average temperature field and the regional temperature of each grilling area.

[0087] 207. For each baking rack area, determine the relationship between the temperature deviation value of the baking rack area and the preset allowable error range. Based on the relationship, determine the target adjustment amount of the PWM duty cycle corresponding to the baking rack area, and control the opening degree of the electromagnetic proportional valve corresponding to the baking rack area according to the target adjustment amount.

[0088] In this embodiment of the invention, it should be noted that for other descriptions of steps 205-207, please refer to the detailed description of steps 102-104 in Embodiment 1 of the invention, and the embodiments of the invention will not repeat them.

[0089] It is evident that implementation Figure 3 The described thermal field leveling control method for a multi-burner gas grill can determine the thermocouple reference temperature and calculate the temperature compensation coefficient at the installation location before the grill starts operating. It can also compensate for the initial temperature of the grill rack based on the compensation coefficient to obtain a precise regional temperature. This effectively corrects temperature acquisition errors caused by thermocouple zero-point offset and thermal radiation interference from the installation location, improving the accuracy and consistency of grill rack temperature acquisition. This provides accurate and reliable basic data for subsequent grilling mode identification and temperature field deviation calculation, further ensuring the accuracy of thermal field leveling adjustment and improving the reliability of the overall control method from the data source. Based on the air temperature inside the oven cavity at each acquisition moment, the method calculates the temperature rise slope inside the gas grill cavity and determines whether the temperature rise slope exceeds a preset slope threshold. When the slope exceeds the threshold, the average temperature field of the gas grill is calculated based on the regional temperature of each grilling area. Then, based on the average temperature field and the regional temperature of each grilling area, the temperature deviation value corresponding to each grilling area is calculated. For each grilling area, the relationship between the temperature deviation value and the preset allowable error range is determined. Based on this relationship, the target adjustment amount of the PWM duty cycle corresponding to that grilling area is determined, and the opening of the electromagnetic proportional valve corresponding to that grilling area is controlled according to the target adjustment amount. This enables targeted differentiated heat compensation for each area, improving the uniformity of the oven cavity temperature field in the simmering mode of the multi-burner gas grill, improving the accuracy of temperature regulation, ensuring uniform heating of food, improving the quality of food grilling, reducing user operation difficulty, and enhancing the user experience and intelligence level of the equipment.

[0090] Example 3 Please see Figure 4 , Figure 4 This is a schematic diagram of the structure of a heat field leveling control device for a multi-burner gas barbecue grill disclosed in an embodiment of the present invention. Figure 4The described heat field leveling control device for a multi-burner gas grill can be applied to a multi-burner gas grill, which may include multiple gas burners. The multiple gas burners can achieve heat field leveling control over multiple grilling areas within the grill cavity. This heat field leveling control device may include an intelligent server or intelligent platform for achieving heat field leveling control. The intelligent server may be a local server or a cloud server; this is not limited in the embodiments of the present invention. Figure 4 As shown, the heat field leveling control device for the multi-burner gas grill may include: The data acquisition module 301 is used to acquire the temperature of the grill rack of the gas barbecue oven and obtain the grill rack temperature set corresponding to different acquisition times. The grill rack temperature set includes the area temperature of at least one grill rack area and the air temperature inside the oven cavity of the gas barbecue oven. Each grill rack area includes two independent electromagnetic proportional valves, and all electromagnetic proportional valves in each grill rack area share a temperature sensor for feedback control. The calculation module 302 is used to calculate the temperature rise slope inside the oven cavity of the gas barbecue oven based on the air temperature inside the oven cavity at each collection time, and to determine whether the temperature rise slope inside the oven cavity is greater than the preset slope threshold. The calculation module 302 is also used to calculate the average temperature field of the gas grill oven based on the regional temperature of each grilling area when the temperature rise slope in the oven cavity is greater than the slope threshold, and to calculate the temperature deviation value corresponding to each grilling area based on the average temperature field and the regional temperature of each grilling area. The determination module 303 is used to determine the relationship between the temperature deviation value of each baking grid area and the preset allowable error range, determine the target adjustment amount of the PWM duty cycle corresponding to the baking grid area based on the relationship, and control the opening degree of the electromagnetic proportional valve corresponding to the baking grid area based on the target adjustment amount.

[0091] It is evident that implementation Figure 4The described thermal field leveling control device for a multi-burner gas grill can collect the grill rack temperature of the gas grill, obtaining a set of grill rack temperatures at different collection times. Based on the air temperature inside the oven cavity at each collection time, it calculates the temperature rise slope inside the oven cavity and determines whether the temperature rise slope inside the oven cavity is greater than a preset slope threshold. When the temperature rise slope inside the oven cavity is greater than the slope threshold, it calculates the average temperature field of the gas grill based on the area temperature of each grill rack area, and calculates the temperature deviation value corresponding to each grill rack area based on the average temperature field and the area temperature of each grill rack area. For each grilling area, the relationship between the temperature deviation value of that grilling area and the preset allowable error range is determined. Based on this relationship, the target adjustment amount of the PWM duty cycle corresponding to that grilling area is determined, and the opening of the electromagnetic proportional valve corresponding to that grilling area is controlled according to the target adjustment amount. This enables targeted differentiated heat compensation for each area, improves the uniformity of the oven cavity temperature field in the simmering mode of the multi-burner gas grill, improves the accuracy of temperature regulation, ensures uniform heating of food, improves the quality of food grilling, reduces the difficulty of user operation, and enhances the user experience and intelligence level of the equipment.

[0092] In an optional embodiment, such as Figure 5 As shown, the acquisition module 301 is also used to acquire the current ambient temperature of the gas grill based on the thermocouple corresponding to each grilling area before the gas grill is started, and to determine the reference temperature based on each acquired current ambient temperature. The data acquisition module 301 is also used to acquire the test temperature of the gas barbecue oven when it is running at the preset test firepower based on the thermocouple corresponding to the grilling area for each grilling area, and to calculate the installation position temperature compensation coefficient of the grilling area based on the test temperature and the reference temperature. Furthermore, the acquisition module 301 acquires the temperature of the grill rack of the gas grill, and the specific methods for obtaining the set of grill rack temperatures corresponding to different acquisition times include: The initial zone temperature of the gas grill is collected at different collection times based on thermocouples of each grilling area, and the air temperature inside the gas grill cavity is collected based on the oven cavity temperature collection element of the gas grill. The initial area temperature is compensated based on the installation location temperature compensation coefficient of each baking grid area to obtain the area temperature of each baking grid area at different collection times.

[0093] It is evident that implementation Figure 5The described multi-burner gas grill's thermal field leveling control device can determine the thermocouple reference temperature and calculate the installation position temperature compensation coefficient before the gas grill starts operating. It can also compensate for the initial temperature of the grill rack based on the compensation coefficient to obtain a precise regional temperature. This effectively corrects temperature acquisition errors caused by thermocouple zero-point offset and thermal radiation interference from the installation position, improving the accuracy and consistency of grill rack temperature acquisition. This provides accurate and reliable basic data for subsequent grilling mode recognition and temperature field deviation calculation, further ensuring the accuracy of thermal field leveling adjustment and improving the reliability of the overall control method from the data source. Based on the air temperature inside the oven cavity at each acquisition moment, it calculates the oven cavity temperature rise slope and determines whether the oven cavity temperature rise slope is greater than a preset slope threshold. When the oven cavity temperature rise slope... When the slope exceeds the threshold, the average temperature field of the gas grill is calculated based on the regional temperature of each grilling area. Then, based on the average temperature field and the regional temperature of each grilling area, the temperature deviation value corresponding to each grilling area is calculated. For each grilling area, the relationship between the temperature deviation value and the preset allowable error range is determined. Based on this relationship, the target adjustment amount of the PWM duty cycle corresponding to that grilling area is determined, and the opening of the electromagnetic proportional valve corresponding to that grilling area is controlled according to the target adjustment amount. This enables targeted differentiated heat compensation for each area, improving the uniformity of the oven cavity temperature field in the simmering mode of the multi-burner gas grill, improving the accuracy of temperature regulation, ensuring uniform heating of food, improving the quality of food grilling, reducing user operation difficulty, and enhancing the user experience and intelligence level of the equipment.

[0094] In another alternative embodiment, such as Figure 5 As shown, the temperature rise slope inside the oven cavity includes the regional temperature rise slope of each baking grid area; The heat field leveling control device for the multi-burner gas grill may also include: The first judgment module 304 is used to determine, before the determination module 303 controls the opening of the electromagnetic proportional valve corresponding to the baking grid area according to the target adjustment amount, whether the temperature rise slope of the baking grid area is continuously lower than the preset load slope threshold for each baking grid area. The calculation module 302 is also used to determine that there is an additional food load in each grilling area when the temperature rise slope of a grilling area is continuously lower than the load slope threshold, and to calculate the firepower compensation coefficient based on the average temperature field and the temperature deviation value corresponding to the grilling area. The firepower compensation coefficient is used to superimpose the target adjustment amount of all electromagnetic proportional valves in the grilling area.

[0095] It is evident that implementation Figure 5The described multi-burner gas grill's thermal field leveling control device can refine the temperature rise slope within the oven cavity into the regional temperature rise slope of each grilling area, accurately capturing the temperature change trend of each grilling area. Before controlling the opening of the electromagnetic proportional valve, it can continuously monitor the regional temperature rise slope of each grilling area and determine if it is below the load slope threshold. When it is determined that there is additional food load in the grilling area, it promptly calculates the firepower compensation coefficient and adds it to the target adjustment amount for that area. This allows for precise and rapid identification of additional food operations in localized areas during the grilling process, providing targeted additional firepower compensation. This effectively compensates for heat loss caused by the absorption of heat by the additional food, preventing sudden temperature drops in localized areas that could lead to a sudden imbalance in the oven cavity temperature field. It improves the adaptability of thermal field leveling control to dynamic grilling conditions, further enhancing the timeliness and accuracy of firepower adjustment, maintaining the uniformity of the oven cavity temperature field in the grilling mode, ensuring even heating of the food, and improving the quality of the grilled food.

[0096] In yet another alternative embodiment, such as Figure 5 As shown, the calculation module 302 calculates the temperature rise slope inside the gas grill cavity based on the air temperature inside the cavity at each acquisition time, and determines whether the temperature rise slope inside the cavity is greater than the preset slope threshold in the following specific ways: The furnace cavity air temperature at each acquisition moment is fitted according to the time sequence to obtain the furnace cavity temperature change curve. The derivative of the furnace cavity temperature change curve is calculated to obtain the furnace cavity temperature rise slope at the current moment. The opening data of the electromagnetic proportional valve corresponding to each grilling area of ​​the gas grill is obtained, and it is determined whether the temperature rise slope in the oven cavity is greater than the preset slope threshold and whether the opening data of each electromagnetic proportional valve is within the preset stable range. When the temperature rise slope in the oven cavity is greater than the slope threshold and the opening data of each electromagnetic proportional valve is within the stable range, it is determined that the gas grill is in the braising mode, and the operation of calculating the average temperature field of the gas grill based on the regional temperature of each grill area is triggered. When the temperature rise slope in the oven cavity is less than or equal to the slope threshold, and / or when the opening data of each electromagnetic proportional valve is outside the stable range, it is determined that the gas grill is not in the simmering mode, and the acquisition module 301 is triggered to perform the operation of acquiring the grill temperature of the gas grill.

[0097] It is evident that implementation Figure 5The described multi-burner gas grill's thermal field leveling control device can obtain a precise temperature rise slope within the oven cavity through curve fitting and differentiation. It can also combine the electromagnetic proportional valve opening data with the stability range to make a comprehensive judgment on the simmering mode. This effectively avoids misjudgments of the simmering mode caused by instantaneous temperature fluctuations and manual heat adjustment, improving the accuracy and rigor of simmering mode recognition. It ensures that thermal field leveling adjustment is only performed in scenarios that meet the simmering conditions, avoiding ineffective adjustments in non-simmering states, and improving the targeting and execution efficiency of the control method.

[0098] In yet another alternative embodiment, such as Figure 5 As shown, the calculation module 302 calculates the average temperature field of the gas grill based on the regional temperature of each grilling area, and calculates the temperature deviation value corresponding to each grilling area based on the average temperature field and the regional temperature of each grilling area. The specific method for calculating the temperature deviation value corresponding to each grilling area includes: For each grilling area, a corresponding weighting coefficient is assigned to the grilling area based on its position information within the oven cavity of the gas grill. The weighting coefficient of the edge area of ​​the oven cavity is lower than that of the center area of ​​the oven cavity. The average temperature field of the gas grill is calculated by taking the regional temperature of each grilling area and the weighting coefficient of each grilling area. For each grilling area, the food load status data of that grilling area is obtained, and the area temperature of the grilling area is corrected based on the food load status data to obtain the corrected area temperature. Based on the corrected area temperature and the average temperature field, the corresponding temperature deviation value of the grilling area is calculated.

[0099] It is evident that implementation Figure 5 The described multi-burner gas grill's heat field leveling control device can assign corresponding weight coefficients and calculate the weighted average temperature field based on the position information of the grill area within the oven cavity. It can also calculate the temperature deviation value after correcting the temperature of the grill area by combining the food load status data. This allows the average temperature field to better match the actual temperature distribution characteristics of the oven cavity, while eliminating the influence of food heat absorption on temperature acquisition, improving the accuracy of temperature deviation value calculation, and making the subsequent firepower adjustment more in line with actual grilling needs, further improving the scientificity and adaptability of heat field leveling adjustment.

[0100] In yet another alternative embodiment, such as Figure 5 As shown, the specific method by which the determining module 303 determines the target adjustment amount of the PWM duty cycle corresponding to the baking grid area based on the size relationship, and controls the opening degree of the electromagnetic proportional valve corresponding to the baking grid area according to the target adjustment amount includes: For each baking griddle area, the initial adjustment amount of the PWM duty cycle corresponding to that baking griddle area is determined based on the temperature deviation value and its magnitude relationship. Collect gas pressure data of the gas grill and perform pressure compensation correction on the initial adjustment of the PWM duty cycle corresponding to each grill area based on the gas pressure data to obtain the target adjustment amount for each grill area. For each baking grid area, the PWM duty cycle corresponding to the baking grid area is adjusted according to the target adjustment amount corresponding to the baking grid area to obtain the adjusted PWM signal. The adjusted PWM signal is then converted into a drive current, and the drive current controls the electromagnetic proportional valve corresponding to the baking grid area to adjust to the target opening degree corresponding to the target adjustment amount according to the preset step size. Specifically, when the magnitude relationship indicates that the temperature deviation value of the baking grid area is greater than the maximum error threshold corresponding to the allowable error range, the target adjustment amount represents the amount of reduction in the PWM duty cycle to reduce the opening of the electromagnetic proportional valve corresponding to the baking grid area; when the magnitude relationship indicates that the temperature deviation value of the baking grid area is less than the minimum error threshold corresponding to the allowable error range, the target adjustment amount represents the amount of increase in the PWM duty cycle to increase the opening of the electromagnetic proportional valve corresponding to the baking grid area.

[0101] It is evident that implementation Figure 5 The described multi-burner gas grill's thermal field leveling control device can determine the initial adjustment amount of the PWM duty cycle by combining the temperature deviation value and its magnitude. It can also compensate and correct the initial adjustment amount using gas pressure data to obtain the target adjustment amount. The adjusted PWM signal is then converted into a drive current to control the electromagnetic proportional valve to adjust to the target opening degree according to a preset step size. This effectively offsets the adjustment deviation caused by gas pressure fluctuations, achieving precise adjustment of the PWM duty cycle. At the same time, it avoids oven cavity temperature field oscillations caused by sudden changes in the opening degree of the electromagnetic proportional valve, improving the accuracy and stability of firepower adjustment. This allows the temperature of each grilling area to approach the average temperature field more quickly and steadily, further improving the oven cavity temperature field leveling effect.

[0102] In yet another alternative embodiment, such as Figure 5 As shown, the heat field leveling control device for the multi-burner gas grill may further include: The second judgment module 305 is used to determine whether the temperature rise slope in the furnace cavity is greater than the preset dry burning threshold when the temperature rise slope in the furnace cavity is greater than the slope threshold. When the temperature rise slope in the furnace cavity is greater than the dry burning threshold, the PWM duty cycle corresponding to each baking grid area is reduced to below the preset safety threshold, and a dry burning warning prompt is output. The first recording module 306 is used to record the adjustment data of each baking grid area and generate a gas nozzle carbon deposit warning information when the temperature deviation value of the baking grid area is outside the allowable error range after the PWM duty cycle of the baking grid area has been adjusted for a preset number of consecutive times.

[0103] It is evident that implementation Figure 5The described thermal field leveling control device for the multi-burner gas grill can promptly reduce the PWM duty cycle and output a dry-burning warning when the temperature rise slope in the oven cavity exceeds the dry-burning threshold. It can also record adjustment data and generate nozzle carbon buildup warning information when the temperature deviation in the grill area still exceeds the allowable error range after a preset number of adjustments. This effectively avoids equipment damage and safety hazards caused by dry burning in the oven cavity, while also promptly detecting gas nozzle carbon buildup faults, reminding users to perform equipment maintenance, ensuring the safe and stable operation of the multi-burner gas grill, extending the equipment's service life, and preventing thermal field leveling adjustment failures due to malfunctions, thus maintaining the equipment's temperature control accuracy.

[0104] In yet another alternative embodiment, such as Figure 5 As shown, the acquisition module 301 is also used to acquire residual heat temperature data of each grill area in the oven cavity of the gas grill when it is detected that the gas grill has exited the simmering mode. The determining module 303 is also used to determine the closing parameters of the electromagnetic proportional valve corresponding to each baking area based on the residual heat temperature data of each baking area, and control the corresponding electromagnetic proportional valve to perform the closing operation according to the closing parameters. The closing parameters include closing timing control parameters and closing rate control parameters. The heat field leveling control device for the multi-burner gas grill may also include: The second recording module 307 is used to record all data when the gas grill is in the braising mode, and to iteratively update the slope threshold and allowable error range based on the all data, and store the all data and the updated slope threshold and allowable error range in the database.

[0105] It is evident that implementation Figure 5 The described thermal field leveling control device for a multi-burner gas grill can collect residual heat temperature data of each grilling area and determine the corresponding electromagnetic proportional valve closing parameters when the gas grill exits the slow-roasting mode. It can also control the electromagnetic proportional valve to perform the closing operation according to the closing parameters. At the same time, it records all data in the slow-roasting mode and iteratively updates the slope threshold and allowable error range. This can effectively avoid over-roasting of food caused by local residual heat accumulation in the oven cavity, further ensuring the roasting quality of the food. At the same time, through data iterative updates, the control parameters are made more in line with the actual use status of the equipment and the roasting scenario, realizing the self-learning optimization of the control method and continuously improving the accuracy and adaptability of thermal field leveling control in subsequent slow-roasting modes.

[0106] Example 4 Please see Figure 6 , Figure 6 This is a schematic diagram of the structure of a heat field leveling control device for a multi-burner gas barbecue grill disclosed in an embodiment of the present invention. Figure 6 As shown, the heat field leveling control device for the multi-burner gas grill may include: Memory 401 storing executable program code; Processor 402 coupled to memory 401; The processor 402 calls the executable program code stored in the memory 401 to execute the steps in the heat field leveling control method for a multi-burner gas barbecue oven described in Embodiment 1 or Embodiment 2 of the present invention.

[0107] Example 5 This invention discloses a computer storage medium storing computer instructions. When these computer instructions are invoked, they are used to execute some or all of the steps in the heat field leveling control method for any of the multi-burner gas grills disclosed in Embodiment 1 of this invention.

[0108] Example 6 This invention discloses a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to perform the steps in the heat field leveling control method for a multi-burner gas grill described in Embodiment 1 or Embodiment 2.

[0109] The device embodiments described above are merely illustrative. The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0110] Through the detailed description of the above embodiments, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, including read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically-Erasable Programmable Read-Only Memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0111] Finally, it should be noted that the heat field leveling control method and apparatus for a multi-burner gas barbecue grill disclosed in the embodiments of the present invention are merely preferred embodiments of the present invention and are only used to illustrate the technical solutions of the present invention, not to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for thermal field leveling control of a multi-burner gas barbecue grill, characterized in that, The method includes: The temperature of the grill rack of the gas grill is collected to obtain a set of grill rack temperatures corresponding to different collection times. The set of grill rack temperatures includes the regional temperature of at least one grill rack area and the air temperature inside the oven cavity of the gas grill. Each grill rack area includes two independent electromagnetic proportional valves, and all electromagnetic proportional valves in each grill rack area share a temperature sensor for feedback control. Based on the air temperature inside the oven cavity at each collection time, the temperature rise slope inside the oven cavity of the gas grill is calculated, and it is determined whether the temperature rise slope inside the oven cavity is greater than a preset slope threshold. When the temperature rise slope in the oven cavity is greater than the slope threshold, the average temperature field of the gas grill oven is calculated based on the regional temperature of each grilling area, and the temperature deviation value corresponding to each grilling area is calculated based on the average temperature field and the regional temperature of each grilling area. For each of the baking grid areas, the relationship between the temperature deviation value of the baking grid area and the preset allowable error range is determined. Based on the relationship, the target adjustment amount of the PWM duty cycle corresponding to the baking grid area is determined, and the opening degree of the electromagnetic proportional valve corresponding to the baking grid area is controlled according to the target adjustment amount.

2. The method for thermal field leveling control of a multi-burner gas barbecue grill according to claim 1, characterized in that, The method further includes: Before the gas grill is operated, the current ambient temperature of the gas grill is collected based on the thermocouple corresponding to each grilling area, and a reference temperature is determined based on the collected current ambient temperature. For each of the grilling areas, the test temperature of the gas grill is collected based on the thermocouple corresponding to the grilling area when the gas grill is running at the preset test firepower, and the installation position temperature compensation coefficient of the grilling area is calculated based on the test temperature and the reference temperature. Furthermore, the process of collecting the temperature of the grill rack of the gas-fired barbecue grill to obtain a set of grill rack temperatures corresponding to different collection times includes: The initial temperature of the gas grill is collected at different sampling times based on the thermocouples of each grilling area, and the air temperature inside the oven cavity of the gas grill is collected based on the oven cavity temperature acquisition element of the gas grill. The initial area temperature is compensated based on the installation location temperature compensation coefficient of each of the baking mesh areas to obtain the area temperature of each of the baking mesh areas at different collection times.

3. The method for thermal field leveling control of a multi-burner gas barbecue grill according to claim 1, characterized in that, The temperature rise slope inside the oven cavity includes the regional temperature rise slope of each of the baking grid areas; Before controlling the opening degree of the electromagnetic proportional valve corresponding to the grilling area according to the target adjustment amount, the method further includes: For each of the baking grid areas, determine whether the temperature rise slope of the baking grid area is continuously lower than a preset load slope threshold. For each of the grilling areas, when the temperature rise slope of a certain grilling area is continuously lower than the load slope threshold, it is determined that there is an additional food load in the grilling area. Based on the average temperature field and the temperature deviation value corresponding to the grilling area, a firepower compensation coefficient is calculated. The firepower compensation coefficient is used to superimpose the target adjustment amount of all electromagnetic proportional valves in the grilling area.

4. The method for thermal field leveling control of a multi-burner gas grill according to any one of claims 1-3, characterized in that, The step of calculating the temperature rise slope inside the oven cavity of the gas-fired barbecue oven based on the air temperature inside the oven cavity at each of the sampling times, and determining whether the temperature rise slope inside the oven cavity is greater than a preset slope threshold, includes: The furnace cavity air temperature at each acquisition time is fitted according to the time sequence to obtain the furnace cavity temperature change curve, and the furnace cavity temperature change curve is differentiated to obtain the furnace cavity temperature rise slope at the current time. The opening data of the electromagnetic proportional valve corresponding to each grilling area of ​​the gas grill is obtained, and it is determined whether the temperature rise slope in the oven cavity is greater than a preset slope threshold and whether the opening data of each electromagnetic proportional valve is within a preset stable range. When the temperature rise slope in the oven cavity is greater than the slope threshold and the opening data of each electromagnetic proportional valve is within the stable range, it is determined that the gas grill is in the braising mode, and the operation of calculating the average temperature field of the gas grill based on the regional temperature of each grill area is triggered. When the temperature rise slope in the oven cavity is less than or equal to the slope threshold, and / or when the opening data of each electromagnetic proportional valve is outside the stable range, it is determined that the gas grill is not in the simmering mode, and the operation of collecting the grill temperature of the gas grill continues.

5. The method for thermal field leveling control of a multi-burner gas grill according to any one of claims 1-3, characterized in that, The step of calculating the average temperature field of the gas grill based on the regional temperature of each grilling area, and calculating the temperature deviation value corresponding to each grilling area based on the average temperature field and the regional temperature of each grilling area, includes: For each grilling area, a corresponding weighting coefficient is assigned to the grilling area according to the position information of the grilling area in the oven cavity of the gas grill, wherein the weighting coefficient of the edge area of ​​the oven cavity is lower than the weighting coefficient of the center area of ​​the oven cavity. The average temperature field of the gas-fired barbecue oven is calculated based on the regional temperature of each grilling area and the weighting coefficient of each grilling area. For each of the baking rack areas, the food load status data of the baking rack area is obtained, and the area temperature of the baking rack area is corrected according to the food load status data to obtain the corrected area temperature. Based on the corrected area temperature and the average temperature field, the temperature deviation value corresponding to the baking rack area is calculated.

6. The method for thermal field leveling control of a multi-burner gas grill according to any one of claims 1-3, characterized in that, The step of determining the target adjustment amount of the PWM duty cycle corresponding to the baking grill area based on the magnitude relationship, and controlling the opening degree of the electromagnetic proportional valve corresponding to the baking grill area based on the target adjustment amount, includes: For each of the baking grid areas, the initial adjustment amount of the PWM duty cycle corresponding to the baking grid area is determined based on the temperature deviation value of the baking grid area and the magnitude relationship. Collect the gas pressure data of the gas grill, and perform pressure compensation correction on the initial adjustment amount of the PWM duty cycle corresponding to each grill area based on the gas pressure data to obtain the target adjustment amount of each grill area. For each of the baking grid areas, the PWM duty cycle corresponding to the baking grid area is adjusted according to the target adjustment amount corresponding to the baking grid area to obtain the adjusted PWM signal. The adjusted PWM signal is then converted into a drive current, and the drive current controls the electromagnetic proportional valve corresponding to the baking grid area to adjust to the target opening degree corresponding to the target adjustment amount according to a preset step size. Wherein, when the magnitude relationship indicates that the temperature deviation value of the baking griddle area is greater than the maximum error threshold corresponding to the allowable error range, the target adjustment amount indicates the amount of reduction of the PWM duty cycle to reduce the opening of the electromagnetic proportional valve corresponding to the baking griddle area; when the magnitude relationship indicates that the temperature deviation value of the baking griddle area is less than the minimum error threshold corresponding to the allowable error range, the target adjustment amount indicates the amount of increase of the PWM duty cycle to increase the opening of the electromagnetic proportional valve corresponding to the baking griddle area.

7. The method for thermal field leveling control of a multi-burner gas grill according to any one of claims 1-3, characterized in that, The method further includes: When the temperature rise slope in the furnace cavity is greater than the slope threshold, it is determined whether the temperature rise slope in the furnace cavity is greater than the preset dry burning threshold. When the temperature rise slope in the furnace cavity is greater than the dry burning threshold, the PWM duty cycle corresponding to each baking grid area is reduced to below the preset safety threshold, and a dry burning warning prompt is output. For each of the baking grid areas, when the PWM duty cycle of the baking grid area is adjusted for a preset number of consecutive times, and the temperature deviation value of the baking grid area is outside the allowable error range, the adjustment data of the baking grid area is recorded, and a gas nozzle carbon deposit warning message is generated.

8. The method for thermal field leveling control of a multi-burner gas barbecue grill according to claim 4, characterized in that, The method further includes: When the gas grill is detected to have exited the roasting mode, residual heat temperature data of each grilling area in the oven cavity of the gas grill is collected. The closing parameters of the electromagnetic proportional valve corresponding to each of the baking grid areas are determined based on the residual heat temperature data of each baking grid area, and the corresponding electromagnetic proportional valve is controlled to perform a closing operation according to the closing parameters. The closing parameters include closing timing control parameters and closing rate control parameters. Record all data when the gas grill is in the braising mode, and iteratively update the slope threshold and the allowable error range based on the all data, and store the all data and the updated slope threshold and the allowable error range in the database.

9. A heat field leveling control device for a multi-burner gas barbecue grill, characterized in that, The device includes: The data acquisition module is used to acquire the temperature of the grill rack of the gas barbecue oven and obtain the grill rack temperature set corresponding to different acquisition times. The grill rack temperature set includes the regional temperature of at least one grill rack area and the air temperature inside the oven cavity of the gas barbecue oven. Each grill rack area includes two independent electromagnetic proportional valves, and all electromagnetic proportional valves in each grill rack area share a temperature sensor for feedback control. The calculation module is used to calculate the temperature rise slope inside the oven cavity of the gas barbecue oven based on the air temperature inside the oven cavity at each collection time, and to determine whether the temperature rise slope inside the oven cavity is greater than a preset slope threshold. The calculation module is also used to calculate the average temperature field of the gas grill oven based on the regional temperature of each grilling area when the temperature rise slope in the oven cavity is greater than the slope threshold, and to calculate the temperature deviation value corresponding to each grilling area based on the average temperature field and the regional temperature of each grilling area. The determination module is used to determine the relationship between the temperature deviation value of each baking grid area and a preset allowable error range, determine the target adjustment amount of the PWM duty cycle corresponding to the baking grid area based on the relationship, and control the opening degree of the electromagnetic proportional valve corresponding to the baking grid area based on the target adjustment amount.

10. A heat field leveling control device for a multi-burner gas barbecue grill, characterized in that, The device includes: Memory containing executable program code; A processor coupled to the memory; The processor calls the executable program code stored in the memory to execute the heat field leveling control method for a multi-burner gas barbecue grill as described in any one of claims 1-8.

11. A computer storage medium, characterized in that, The computer storage medium stores computer instructions, which, when invoked, are used to execute the heat field leveling control method for a multi-burner gas grill as described in any one of claims 1-8.

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