Gas oven and centroid temperature estimation method of gas oven

Abstract

The invention relates to a gas oven and a centroid temperature estimation method of the gas oven, and belongs to the technical field of gas ovens. The method comprises the following steps: obtaining the thermal inertia delay time of an upper heating pipe, the change temperature of three temperature probes during upper calibration, the change temperature of the three temperature probes during left calibration and the change temperature of the three temperature probes during right calibration through temperature calibration of an oven; and the calibration change temperature and the thermal inertia delay time are substituted, and the current centroid temperature value of the oven is calculated in real time according to the actual working condition of the load of the oven, so that the measurement precision of the centroid temperature of the oven can be effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of gas ovens, and particularly to a gas oven and a method for estimating the centroid temperature of a gas oven. Background Art

[0002] With the development of society and the progress of technology, people's requirements for the quality of life are getting higher and higher. People who like to eat barbecue expect to be able to barbecue at home. It is becoming more and more common to use an oven to complete home barbecue. When the oven is in use, the centroid temperature of the oven can represent the heating temperature of the oven, which is an important data that needs to be monitored in the oven. In the existing oven, a temperature probe is arranged in the inner cavity of the oven to detect the heating temperature. If the temperature probe is placed in the middle of the oven, it will interfere with the placement of the food ingredients, so it cannot be placed in the middle position of the oven. If it is placed around the inner cavity of the oven, it will cause the problem of inaccurate temperature detection of the centroid of the oven. Summary of the Invention

[0003] Therefore, the present invention provides a gas oven and a method for estimating the centroid temperature of a gas oven to solve the problem that the temperature probe in the existing oven is placed around the inner cavity of the oven, resulting in inaccurate temperature detection of the centroid of the oven.

[0004] In a first aspect, a gas oven is provided, and the gas oven includes:

[0005] An oven shell, an oven inner cavity and a main control board;

[0006] An upper heating tube is arranged on the top wall of the oven inner cavity, and the upper heating tube is connected with a power adjustment device; a left burner is arranged at a position near the bottom on the left wall of the oven inner cavity; a right burner is arranged at a position near the bottom on the right wall of the oven inner cavity; both the left burner and the right burner are provided with a pulse igniter and an electronically controlled gas regulating valve; a left temperature probe is arranged at a middle position on the left side of the rear wall of the oven inner cavity; a right temperature probe is arranged at a position near the bottom on the right side of the rear wall of the oven inner cavity; an upper temperature probe is arranged at a position near the top on the right side of the rear wall of the oven inner cavity;

[0007] The power adjustment device, the pulse igniter, the electronically controlled gas regulating valve, the upper temperature probe, the left temperature probe and the right temperature probe are respectively electrically connected to the main control board;

[0008] It further includes the centroid of the inner cavity of the oven; the distances between the left temperature probe, the right temperature probe and the upper temperature probe and the centroid of the inner cavity are the same.

[0009] In a second aspect, a method for estimating the centroid temperature of a gas oven is provided, which is applied to the above gas oven, and the method includes:

[0010] Obtain the calibrated temperature change and the thermal inertia delay duration of the upper heating tube through the temperature calibration of the oven; the calibrated temperature change includes the temperature changes of the three temperature probes during upper calibration, the temperature changes of the three temperature probes during left calibration, and the temperature changes of the three temperature probes during right calibration;

[0011] Obtain the centroid temperature value of the oven based on the preset heating mode, the calibrated temperature change, and the thermal inertia delay duration; the preset heating mode includes gas heating and hybrid heating.

[0012] Further, the obtaining of the centroid temperature value of the oven based on the preset heating mode, the calibrated temperature change, and the thermal inertia delay duration includes:

[0013] If the preset heating mode is gas heating, obtain the centroid temperature value of the oven based on the calibrated temperature change;

[0014] If the preset heating mode is hybrid heating, obtain the centroid temperature value of the oven based on the calibrated temperature change and the thermal inertia delay duration.

[0015] Further, the obtaining of the centroid temperature value of the oven based on the calibrated temperature change includes:

[0016] Obtain the real-time temperatures of the left temperature probe and the right temperature probe;

[0017] Obtain the real-time load duty ratios of the left burner and the right burner;

[0018] Obtain the real-time powers of the left burner and the right burner based on the real-time load duty ratios;

[0019] Obtain the estimated ratios of the left temperature probe and the right temperature probe based on the real-time powers and the calibrated temperature change;

[0020] Obtain the centroid temperature value of the oven based on the real-time temperatures and the estimated ratios of the left temperature probe and the right temperature probe.

[0021] Further, the obtaining of the estimated ratios of the left temperature probe and the right temperature probe based on the real-time powers and the calibrated temperature change includes:

[0022] Obtain the estimated ratio of the left temperature probe based on the real-time powers of the left burner and the right burner and the temperature changes of the three temperature probes during left calibration. The calculation formula is:

[0023]

[0024] where TL 比例 is the estimated ratio of the left temperature probe; PL 实时 is the real-time power of the left burner; PR 实时is the real-time power of the right burner; TL Δ左 is the changing temperature of the left temperature probe during left calibration; TR Δ左 is the changing temperature of the right temperature probe during left calibration;

[0025] Based on the real-time powers of the left burner and the right burner, and the changing temperatures of the three temperature probes during the right calibration, an estimated ratio of the right temperature probe is obtained. The calculation formula is:

[0026]

[0027] where, TR 比例 is the estimated ratio of the right temperature probe; PL 实时 is the real-time power of the left burner; PR 实时 is the real-time power of the right burner; TL Δ右 is the changing temperature of the left temperature probe during right calibration; TR Δ右 is the changing temperature of the right temperature probe during right calibration.

[0028] Further, obtaining the oven centroid temperature value based on the real-time temperatures and the estimated ratios of the left temperature probe and the right temperature probe includes:

[0029] Obtaining the oven centroid temperature value through the first centroid temperature calculation formula. The first centroid temperature calculation formula is:

[0030] TC 估算 = TL 比例 * TL 实时 + TR 比例 * TR 实时 ;

[0031] where, TC 估算 is the oven centroid temperature value; TL 比例 is the estimated ratio of the left temperature probe; TR 比例 is the estimated ratio of the right temperature probe; TL 实时 is the real-time temperature of the left temperature probe; TR 实时 is the real-time temperature of the right temperature probe.

[0032] Further, obtaining the oven centroid temperature value based on the calibrated changing temperature and the thermal inertia delay duration includes:

[0033] Obtaining the real-time temperatures of the upper temperature probe, the left temperature probe, and the right temperature probe;

[0034] Obtaining the real-time load duty cycles of the left burner and the right burner, and obtaining the delayed load duty cycle of the upper heating pipe during the thermal inertia delay duration before the current time point;

[0035] Obtain the real-time power of the left burner and the right burner based on the real-time load duty ratio; obtain the delayed power of the upper heating tube based on the delayed load duty ratio;

[0036] Obtain the estimated ratios of the upper temperature probe, the left temperature probe, and the right temperature probe based on the real-time power, the delayed power, and the calibrated temperature change;

[0037] Obtain the oven centroid temperature value based on the real-time temperatures of the upper temperature probe, the left temperature probe, and the right temperature probe and the estimated ratios.

[0038] Further, the obtaining the estimated ratios of the upper temperature probe, the left temperature probe, and the right temperature probe based on the real-time power, the delayed power, and the calibrated temperature change includes:

[0039] Obtain the estimated ratio of the left temperature probe based on the real-time power of the left burner and the right burner, the delayed power of the upper heating tube, and the temperature changes of the three temperature probes during left calibration. The calculation formula is:

[0040]

[0041] where TL 比例 is the estimated ratio of the left temperature probe; PL 实时 is the real-time power of the left burner; PR 实时 is the real-time power of the right burner; PU 延迟 is the delayed power of the upper heating tube; TL Δ左 is the temperature change of the left temperature probe during left calibration; TR Δ左 is the temperature change of the right temperature probe during left calibration; TU Δ左 is the temperature change of the upper temperature probe during left calibration;

[0042] Obtain the estimated ratio of the right temperature probe based on the real-time power of the left burner and the right burner, the delayed power of the upper heating tube, and the temperature changes of the three temperature probes during right calibration. The calculation formula is:

[0043]

[0044] where TR 比例 is the estimated ratio of the right temperature probe; PL 实时 is the real-time power of the left burner; PR 实时 is the real-time power of the right burner; PU 延迟 is the delayed power of the upper heating tube; TL Δ右 is the temperature change of the left temperature probe during right calibration; TR Δ右 is the temperature change of the right temperature probe during right calibration; TU Δ右 is the temperature change of the upper temperature probe during right calibration;

[0045] Obtain the estimated ratio of the upper temperature probe based on the real-time power of the left burner and the right burner, the delayed power of the upper heating tube, and the changing temperatures of the three temperature probes at the upper calibration time. The calculation formula is:

[0046]

[0047] where TU 比例 is the estimated ratio of the upper temperature probe; PL 实时 is the real-time power of the left burner; PR 实时 is the real-time power of the right burner; PU 延迟 is the delayed power of the upper heating tube; TL Δ上 is the changing temperature of the left temperature probe at the upper calibration time; TR Δ上 is the changing temperature of the right temperature probe at the upper calibration time; TU Δ上 is the changing temperature of the upper temperature probe at the upper calibration time.

[0048] Furthermore, obtaining the centroid temperature value of the oven based on the real-time temperatures and the estimated ratios of the upper temperature probe, the left temperature probe, and the right temperature probe includes:

[0049] Obtain the centroid temperature value of the oven through the second centroid temperature calculation formula. The second centroid temperature calculation formula is:

[0050] TC 估算 = TL 比例 * TL 实时 + TR 比例 * TR 实时 + TU 比例 * TU 实时 ;

[0051] where TC 估算 is the centroid temperature value of the oven; TL 比例 is the estimated ratio of the left temperature probe; TR 比例 is the estimated ratio of the right temperature probe; TU 比例 is the estimated ratio of the upper temperature probe; TL 实时 is the real-time temperature of the left temperature probe; TR 实时 is the real-time temperature of the right temperature probe; TU 实时 is the real-time temperature of the upper temperature probe.

[0052] Furthermore, obtaining the calibration change temperature and the thermal inertia delay duration of the upper heating tube through the temperature calibration of the oven includes:

[0053] Initialize the state of the gas oven to make the gas oven in a cold state, and the difference in the real-time temperatures of the upper temperature probe, the left temperature probe, and the right temperature probe is less than 1 degree;

[0054] Obtain the real-time temperatures of the upper temperature probe, the left temperature probe, and the right temperature probe as the initial temperatures;

[0055] If left calibration is to be performed, heat the left burner at maximum power for a preset duration and then stop heating, and obtain the real-time temperatures of the upper temperature probe, the left temperature probe, and the right temperature probe as the cut-off temperatures; subtract the initial temperatures from the cut-off temperatures corresponding to the three temperature probes to obtain the temperature changes of the three temperature probes during left calibration;

[0056] If right calibration is to be performed, heat the right burner at maximum power for a preset duration and then stop heating, and obtain the real-time temperatures of the upper temperature probe, the left temperature probe, and the right temperature probe as the cut-off temperatures; subtract the initial temperatures from the cut-off temperatures corresponding to the three temperature probes to obtain the temperature changes of the three temperature probes during right calibration;

[0057] If upper calibration is to be performed, heat the upper heating tube at maximum power for a preset duration and then stop heating, and obtain the real-time temperatures of the upper temperature probe, the left temperature probe, and the right temperature probe as the cut-off temperatures; subtract the initial temperatures from the cut-off temperatures corresponding to the three temperature probes to obtain the temperature changes of the three temperature probes during right calibration; take the duration of the temperature rise of the upper heating tube due to thermal inertia after stopping heating as the thermal inertia delay duration.

[0058] The present invention adopts the above technical solutions and has at least the following beneficial effects:

[0059] A gas oven and a method for estimating the centroid temperature of a gas oven are provided. By calibrating the temperature of the oven, the thermal inertia delay duration of the upper heating tube, the temperature changes of the three temperature probes during upper calibration, the temperature changes of the three temperature probes during left calibration, and the temperature changes of the three temperature probes during right calibration are obtained. Then, according to the preset heating mode setting situation, the calibrated temperature changes and the thermal inertia delay duration are brought in, and the current centroid temperature value of the oven is calculated in real time according to the actual working conditions of the oven load, which can effectively improve the measurement accuracy of the centroid temperature of the oven.

[0060] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0062] Figure 1It is a schematic structural diagram A of a gas oven shown in an exemplary embodiment of the present invention;

[0063] Figure 2 It is a schematic structural diagram B of a gas oven shown in an exemplary embodiment of the present invention;

[0064] Figure 3 It is a flowchart of a method for estimating the centroid temperature of a gas oven shown in an exemplary embodiment of the present invention. Detailed implementation manners

[0065] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0066] In the prior art, in order to measure the centroid temperature of an oven, a temperature probe is arranged in the inner cavity of the oven to detect the heating temperature. If the temperature probe is arranged in the middle of the oven, it will interfere with the placement of food materials, so it cannot be placed in the middle position of the oven. If it is placed around the inner cavity of the oven, it will cause inaccurate temperature detection of the centroid of the oven.

[0067] The embodiments of the present application provide a gas oven and a method for estimating the centroid temperature of the gas oven. The oven uses 2 gas heating sources and 1 electric heating source, and 3 temperature probes located at the edge of the oven. The method for estimating the centroid temperature of the oven can accurately estimate the temperature at the center point according to the real-time heating power.

[0068] The gas oven and the estimation method in the present application will be described below through specific embodiments.

[0069] Please refer to Figure 1 、 Figure 2 , Figure 1 It is a schematic structural diagram A of a gas oven shown in an exemplary embodiment of the present invention, Figure 2 It is a schematic structural diagram B of a gas oven shown in an exemplary embodiment of the present invention. Refer to Figure 1 、 Figure 2, the gas oven includes: an oven housing 1, an oven cavity 2, and a main control board; an upper heating tube 3 is provided on the top wall of the oven cavity 2, and the upper heating tube 3 is connected to a power adjustment device; a left burner 4 is provided at a position near the bottom on the left wall of the oven cavity 2; a right burner 5 is provided at a position near the bottom on the right wall of the oven cavity 2; both the left burner 4 and the right burner 5 are provided with a pulse igniter and an electronically controlled gas regulating valve; a left temperature probe 6 is provided at the middle position on the left side of the rear wall of the oven cavity 2; a right temperature probe 7 is provided at a position near the bottom on the right side of the rear wall of the oven cavity 2; an upper temperature probe 8 is provided at a position near the top on the right side of the rear wall of the oven cavity 2; the power adjustment device, the pulse igniter, the electronically controlled gas regulating valve, the upper temperature probe 6, the left temperature probe 7, and the right temperature probe 8 are respectively electrically connected to the main control board; it further includes the centroid 9 of the oven cavity 2; the distances between the left temperature probe 6, the right temperature probe 7, and the upper temperature probe 8 and the centroid 9 are the same.

[0070] It should be noted that the main control board is responsible for controlling all loads and processing all input and output data. The electric heating tube is located at the top of the oven and is used for auxiliary heating; there are 2 burners, which are respectively located on the left and right sides of the oven and are used for main heating; there are 2 pulse igniters, which are responsible for generating high-voltage pulses and igniting the gas near the burners; there are 2 electronically controlled gas regulating valves, which are respectively responsible for adjusting the gas flow rates of the left and right burners. The gas regulating valve can be a proportional valve, a stepper motor, a butterfly valve, etc., which are valve bodies that can adjust the flow rate through electronic control; the gas switch valve is responsible for the opening and closing of the main gas path of the gas. The gas needs to pass through this switch valve first and then be respectively split into the left and right gas regulating valves; there are 2 flame detectors, which are responsible for respectively detecting whether there is flame combustion near the left and right burners; there are 3 temperature probes, namely the left temperature probe, the right temperature probe, and the upper temperature probe, which are responsible for detecting the temperature in the corresponding areas inside the oven; the display operation board is responsible for the interaction with the user and includes functions such as turning on and off, adjusting the target temperature, setting the mode, and displaying.

[0071] It can be understood that for the gas oven provided in this embodiment, through the temperature calibration of the oven, the thermal inertia delay time of the upper heating tube, the temperature changes of the three temperature probes during upper calibration, the temperature changes of the three temperature probes during left calibration, and the temperature changes of the three temperature probes during right calibration are obtained. Then, according to the preset heating mode setting situation, the calibrated temperature changes and the thermal inertia delay time are brought in, and the current centroid temperature value of the oven is calculated in real time according to the actual working conditions of the oven load, which can effectively improve the measurement accuracy of the centroid temperature of the oven.

[0072] Please refer to Figure 3 , Figure 3 is a flowchart of a method for estimating the centroid temperature of a gas oven shown in an exemplary embodiment of the present invention. Refer to Figure 3 , the estimation method includes:

[0073] Step S11: Obtain the calibrated temperature change and the thermal inertia delay duration of the upper heating tube through the temperature calibration of the oven; the calibrated temperature change includes the temperature changes of the three temperature probes during upper calibration, the temperature changes of the three temperature probes during left calibration, and the temperature changes of the three temperature probes during right calibration.

[0074] Step S12: Obtain the centroid temperature value of the oven based on the preset heating mode, the calibrated temperature change, and the thermal inertia delay duration; the preset heating modes include gas heating and mixed heating.

[0075] It should be noted that the estimation method provided in this embodiment is applicable to scenarios including but not limited to gas ovens in specific practices.

[0076] Specifically, the gas heating mode is to only turn on the left burner and the right burner for heating, and the upper heating tube for auxiliary heating is in the off state; the mixed heating is to turn on the upper heating tube, the left burner, and the right burner for heating.

[0077] It can be understood that the estimation method provided in this embodiment obtains the thermal inertia delay duration of the upper heating tube, the temperature changes of the three temperature probes during upper calibration, the temperature changes of the three temperature probes during left calibration, and the temperature changes of the three temperature probes during right calibration through the temperature calibration of the oven. Then, according to the preset heating mode setting, the calibrated temperature change and the thermal inertia delay duration are substituted, and the current centroid temperature value of the oven is calculated in real time according to the actual working conditions of the oven load, which can effectively improve the measurement accuracy of the centroid temperature of the oven.

[0078] In specific practice, "obtaining the calibrated temperature change and the thermal inertia delay duration of the upper heating tube through the temperature calibration of the oven" in step S11 includes: initializing the state of the gas oven to make the gas oven in a cold state, and the real-time temperature difference between the upper temperature probe, the left temperature probe, and the right temperature probe is less than 1 degree; obtaining the real-time temperatures of the upper temperature probe, the left temperature probe, and the right temperature probe as the initial temperatures; if left calibration is performed, heating the left burner at the maximum power for a preset duration and then stopping heating, and obtaining the real-time temperatures of the upper temperature probe, the left temperature probe, and the right temperature probe as the cut-off temperatures; subtracting the initial temperatures from the cut-off temperatures corresponding to the three temperature probes to obtain the temperature changes of the three temperature probes during left calibration; if right calibration is performed, heating the right burner at the maximum power for a preset duration and then stopping heating, and obtaining the real-time temperatures of the upper temperature probe, the left temperature probe, and the right temperature probe as the cut-off temperatures; subtracting the initial temperatures from the cut-off temperatures corresponding to the three temperature probes to obtain the temperature changes of the three temperature probes during right calibration; if upper calibration is performed, heating the upper heating tube at the maximum power for a preset duration and then stopping heating, and obtaining the real-time temperatures of the upper temperature probe, the left temperature probe, and the right temperature probe as the cut-off temperatures; subtracting the initial temperatures from the cut-off temperatures corresponding to the three temperature probes to obtain the temperature changes of the three temperature probes during right calibration; taking the duration of the temperature rise of the upper heating tube due to thermal inertia after stopping heating as the thermal inertia delay duration.

[0079] It should be noted that when calibrating the left burner, ensure that the oven is in a cold state. When the temperature difference between TL, TR, and TU is less than 1 °, start the calibration program; record the temperatures of the 3 temperature probes at this time and save them as TL 左初 、TR 左初 、TU 左初 ; Turn on the left burner at 100% power and start timing; when the time reaches the "first calibration time" (such as 1 minute), turn off the left burner and stop timing; since the burner has almost no thermal inertia, the temperature of TU will not continue to rise at this time. Record the temperatures of the 3 temperature probes at this time and save them as TL 左末 、TR 左末 、TU 左末 ; Calculate the temperature rise of TL, TR, and TU during the whole process and save it as TL △左 =TL 左末 -TL 左初 、TR △左 =TR 左末 -TR 左初 、TU △左 =TU 左末 -TU 左初 。The calibration process of the right burner is the same as that of the left burner, and finally save the calibration results TL △右 、TR △右 、TU △右 ;

[0080] When calibrating the upper heating tube, ensure that the oven is cold. When the temperature differences between TL, TR, and TU are less than 1°C, start the calibration program; record the temperatures of the 3 temperature probes at this time and save them as TL 上初 、TR 上初 、TU 上初 ; Turn on the upper heating tube at 100% power and start timing; when the time reaches the "first calibration time" (such as 1 minute), turn off the upper heating tube and stop timing; due to the large thermal inertia of the electric heating tube, the temperature of TU will continue to rise at this time, restart the timing; continuously detect the temperature value of TU until the temperature of TU no longer rises, and save TU 延迟时间 , record the time of timing at this time and the temperatures of the 3 temperature probes, and save them as TL 上末 、TR 上末 、TU 上末 ; Calculate the temperature rises of TL, TR, and TU during the whole process and save them as TL △上 =TL 上末 -TL 上初 、TR △上 =TR 上末 -TR 上初 、TU △上 =TU 上末 -TU 上初 ; The calibration of the upper heating tube is completed.

[0081] In specific practice, "obtaining the oven centroid temperature value based on the preset heating mode, calibration change temperature, and thermal inertia delay duration" in step S12 includes: if the preset heating mode is gas heating, obtaining the oven centroid temperature value based on the calibration change temperature; if the preset heating mode is hybrid heating, obtaining the oven centroid temperature value based on the calibration change temperature and the thermal inertia delay duration.

[0082] Specifically, when the preset heating mode is gas heating, obtain the real-time temperatures of the left temperature probe and the right temperature probe; obtain the real-time load duty ratios of the left burner and the right burner; obtain the real-time powers of the left burner and the right burner based on the real-time load duty ratios; obtain the estimated ratios of the left temperature probe and the right temperature probe based on the real-time powers and the calibration change temperature; obtain the oven centroid temperature value based on the real-time temperatures and the estimated ratios of the left temperature probe and the right temperature probe.

[0083] Specifically, when the preset heating mode is gas heating, the calculation process of the estimated ratios of the left temperature probe and the right temperature probe is: obtain the estimated ratio of the left temperature probe based on the real-time powers of the left burner and the right burner and the change temperatures of the three temperature probes during left calibration. The calculation formula is: where TL 比例 is the estimated ratio of the left temperature probe; PL 实时 is the real-time power of the left burner; PR实时 is the real-time power of the right burner; TL Δ左 is the temperature change of the left temperature probe during left calibration; TR Δ左 is the temperature change of the right temperature probe during left calibration; The estimated ratio of the right temperature probe is obtained based on the real-time powers of the left burner and the right burner and the temperature changes of the three temperature probes during right calibration. The calculation formula is: wherein, TR 比例 is the estimated ratio of the right temperature probe; PL 实时 is the real-time power of the left burner; PR 实时 is the real-time power of the right burner; TL Δ右 is the temperature change of the left temperature probe during right calibration; TR Δ右 is the temperature change of the right temperature probe during right calibration.

[0084] Specifically, assuming the preset heating mode is gas heating, the calculation process of the oven centroid temperature value: The oven centroid temperature value is obtained through the first centroid temperature calculation formula. The first centroid temperature calculation formula is: TC 结算 = TL 比例 *TL 实时 +TR 比例 *TR 实时 ; wherein, TC 估算 is the oven centroid temperature value; TL 比例 is the estimated ratio of the left temperature probe; TR 比例 is the estimated ratio of the right temperature probe; TL 实时 is the real-time temperature of the left temperature probe; TR 实时 is the real-time temperature of the right temperature probe.

[0085] Specifically, assuming the preset heating mode is hybrid heating, obtain the real-time temperatures of the upper temperature probe, the left temperature probe, and the right temperature probe; obtain the real-time load duty ratios of the left burner and the right burner, and obtain the delayed load duty ratio of the upper heating tube for the thermal inertia delay duration before the current time point; obtain the real-time powers of the left burner and the right burner based on the real-time load duty ratios; obtain the delayed power of the upper heating tube based on the delayed load duty ratio; obtain the estimated ratios of the upper temperature probe, the left temperature probe, and the right temperature probe based on the real-time powers, the delayed power, and the calibrated temperature changes; obtain the oven centroid temperature value based on the real-time temperatures and the estimated ratios of the upper temperature probe, the left temperature probe, and the right temperature probe.

[0086] Specifically, assuming the preset heating mode is hybrid heating, the calculation process of the estimated ratios of the upper temperature probe, the left temperature probe, and the right temperature probe is as follows: The estimated ratio of the left temperature probe is obtained based on the real-time powers of the left burner and the right burner, the delayed power of the upper heating tube, and the temperature changes of the three temperature probes during left calibration. The calculation formula is: wherein, TL 比例is the estimated ratio of the left temperature probe; PL 实时 is the real-time power of the left burner; PR 实时 is the real-time power of the right burner; PU 延迟 is the delayed power of the upper heating tube; TL Δ左 is the temperature change of the left temperature probe during left calibration; TR Δ左 is the temperature change of the right temperature probe during left calibration; TU Δ左 is the temperature change of the upper temperature probe during left calibration; The estimated ratio of the right temperature probe is obtained based on the real-time powers of the left burner and the right burner, the delayed power of the upper heating tube, and the temperature changes of the three temperature probes during right calibration. The calculation formula is: where, TR 比例 is the estimated ratio of the right temperature probe; PL 实时 is the real-time power of the left burner; PR 实时 is the real-time power of the right burner; PU 延迟 is the delayed power of the upper heating tube; TL Δ右 is the temperature change of the left temperature probe during right calibration; TR Δ右 is the temperature change of the right temperature probe during right calibration; TU Δ右 is the temperature change of the upper temperature probe during right calibration; The estimated ratio of the upper temperature probe is obtained based on the real-time powers of the left burner and the right burner, the delayed power of the upper heating tube, and the temperature changes of the three temperature probes during upper calibration. The calculation formula is: where, TU 比例 is the estimated ratio of the upper temperature probe; PL 实时 is the real-time power of the left burner; PR 实时 is the real-time power of the right burner; PU 延迟 is the delayed power of the upper heating tube; TL Δ上 is the temperature change of the left temperature probe during upper calibration; TR Δ上 is the temperature change of the right temperature probe during upper calibration; TU Δ上 is the temperature change of the upper temperature probe during upper calibration.

[0087] Specifically, the preset heating mode is hybrid heating. The calculation process of the oven centroid temperature value: The oven centroid temperature value is obtained through the second centroid temperature calculation formula. The second centroid temperature calculation formula is: TC 估算 = TL 比例 *TL 实时 +TR 比例 *TR 实时 +TU 比例 *TU 实时 ; where, TC 估算 is the oven centroid temperature value; TL 比例 is the estimated ratio of the left temperature probe; TR 比例is the estimated ratio of the right temperature probe; TU 比例 is the estimated ratio of the upper temperature probe; TL 实时 is the real-time temperature of the left temperature probe; TR 实时 is the real-time temperature of the right temperature probe; TU 实时 is the real-time temperature of the upper temperature probe.

[0088] It should be noted that the real-time power of the left burner is calculated by the formula: PL 实时 = PL 占空比 * PL 最大 ; where, PL 实时 is the real-time power of the left burner, PL 占空比 is the duty cycle of the workload read from the left burner, PL 最大 is the maximum heating power of the left burner; the real-time power of the right burner is calculated by the formula: PR 实时 = PR 占空比 * PR 最大 ; where, PR 实时 is the real-time power of the right burner; PR 占空比 is the duty cycle of the workload read from the right burner, PR 最大 is the maximum heating power of the right burner; the delayed power of the upper heating tube is calculated by the formula: PU 延迟 = PU 占空比 * PU 最大 ; where, PU 延迟 is the delayed power of the upper heating tube, PU 最大 is the maximum heating power of the upper heating tube, PU 占空比 is the duty cycle of the workload of the upper heating tube, PU 占空比 The determination process of is as follows: read the duty cycle of the workload of the upper heating tube, save the duty cycle of the workload once every unit time, and the unit time is at least the thermal inertia delay duration. Since the thermal inertia of the upper heating tube is large, changing the duty cycle of the heating tube cannot immediately change the heat generation of the heating tube. Therefore, the duty cycle of the heating tube before the thermal inertia delay duration is read as the duty cycle of the workload of the upper heating tube.

[0089] It can be understood that the estimation method provided in this embodiment combines the real-time power of the left and right heaters, the delayed power of the upper heating tube, and the calibrated change temperature to obtain the estimated ratio of each temperature probe, and then obtains the centroid temperature value of the gas oven based on the real-time temperature and the estimated ratio of each temperature probe, improving the measurement accuracy of the centroid temperature of the oven.

[0090] The above-described embodiments merely represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

[0091] Those of ordinary skill in the art can understand that all or part of the processes of implementing the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the embodiments provided by the present application can include non-volatile and / or volatile memories. Non-volatile memories can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memories can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0092] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0093] The above-described embodiments merely represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A gas oven, characterized in that: The gas oven comprises: An oven casing (1), an oven cavity (2) and a main control panel; An upper heating tube (3) is arranged on the top wall of the oven cavity (2), and the upper heating tube (3) is connected to a power regulating device; a left burner (4) is arranged at a bottom position on the left wall of the oven cavity (2); a right burner (5) is arranged at a bottom position on the right wall of the oven cavity (2); both the left burner (4) and the right burner (5) are provided with a pulse igniter and an electronically controlled gas regulating valve; a left temperature probe (6) is arranged at a middle position on the left side of the rear wall of the oven cavity (2); a right temperature probe (7) is arranged at a bottom position on the right side of the rear wall of the oven cavity (2); and an upper temperature probe (8) is arranged at a top position on the right side of the rear wall of the oven cavity (2); The power regulating device, the pulse igniter, the electronically controlled gas regulating valve, the upper temperature probe (6), the left temperature probe (7) and the right temperature probe (8) are electrically connected to the main control board respectively; It also includes an inner cavity centroid (9) of the inner cavity (2) of the oven; the distances between the left temperature probe (6), the right temperature probe (7) and the upper temperature probe (8) and the inner cavity centroid (9) are all the same.

2. A method for estimating the centroid temperature of a gas oven, characterized in that: The method is applied to the gas oven according to claim 1, and the method comprises: The calibration change temperature and the thermal inertia delay time of the upper heating tube are obtained by temperature calibration of the oven; the calibration change temperature includes the change temperature of the three temperature probes during the upper calibration, the change temperature of the three temperature probes during the left calibration, and the change temperature of the three temperature probes during the right calibration; The centroid temperature value of the oven is obtained according to a preset heating mode, the calibration change temperature and the thermal inertia delay time; the preset heating mode includes gas heating and mixed heating.

3. The estimation method according to claim 1, characterized in that: The method of obtaining the centroid temperature value of the oven according to the preset heating mode, the calibration change temperature and the thermal inertia delay time includes: If the preset heating mode is gas heating, the centroid temperature value of the oven is obtained according to the calibrated change temperature; If the preset heating mode is mixed heating, the centroid temperature value of the oven is obtained according to the calibration change temperature and the thermal inertia delay time.

4. The estimation method according to claim 3, characterized in that: The step of obtaining the centroid temperature value of the oven according to the calibrated change temperature comprises: Get the real-time temperature of the left temperature probe and the right temperature probe; Obtain the real-time load duty ratio of the left burner and the right burner; Obtaining the real-time power of the left burner and the right burner according to the real-time load duty cycle; Obtaining an estimated ratio of the left temperature probe to the right temperature probe according to the real-time power and the calibrated change temperature; The oven centroid temperature value is obtained according to the real-time temperatures of the left temperature probe and the right temperature probe and the estimated ratio.

5. The estimation method according to claim 4, characterized in that: The step of obtaining an estimated ratio of the left temperature probe to the right temperature probe according to the real-time power and the calibrated change temperature includes: According to the real-time power of the left burner and the right burner, and the temperature changes of the three temperature probes during the left calibration, the estimated ratio of the left temperature probe is obtained, and the calculation formula is: Among them, TL 比例 is the estimated ratio of the left temperature probe; PL 实时 is the real-time power of the left burner; PR 实时 is the real-time power of the right burner; TL Δ左 TR is the temperature change of the left temperature probe during left calibration; Δ左 is the changing temperature of the right temperature probe during the left calibration; According to the real-time power of the left burner and the right burner, and the change temperature of the three temperature probes during the right calibration, the estimated ratio of the right temperature probe is obtained, and the calculation formula is: Among them, TR 比例 is the estimated ratio of the right temperature probe; PL 实时 is the real-time power of the left burner; PR 实时 is the real-time power of the right burner; TL Δ右 TR is the temperature change of the left temperature probe during the right calibration; Δ右 is the changing temperature of the right temperature probe during right calibration.

6. The estimation method according to claim 5, characterized in that: The step of obtaining the oven centroid temperature value according to the real-time temperatures of the left temperature probe and the right temperature probe and the estimated ratio includes: The centroid temperature value of the oven is obtained by the first centroid temperature calculation formula, and the first centroid temperature calculation formula is: TC 估算 =TL 比例 *TL 实时 +TR 比例 *TR 实时 ; Among them, TC 估算 is the centroid temperature of the oven; TL 比例 is the estimated ratio of the left temperature probe; TR 比例 is the estimated ratio of the right temperature probe; TL 实时 is the real-time temperature of the left temperature probe; TR 实时 It is the real-time temperature of the right temperature probe.

7. The estimation method according to claim 3, characterized in that: The step of obtaining the centroid temperature value of the oven according to the calibration change temperature and the thermal inertia delay time includes: Get the real-time temperatures of the upper temperature probe, the left temperature probe, and the right temperature probe; Obtaining the real-time load duty ratios of the left burner and the right burner, and obtaining the delayed load duty ratio of the upper heating tube of the thermal inertia delay time before the current time point; The real-time power of the left burner and the right burner is obtained according to the real-time load duty ratio; the delayed power of the upper heating tube is obtained according to the delayed load duty ratio; Obtaining an estimated ratio of an upper temperature probe, a left temperature probe, and a right temperature probe according to the real-time power, the delayed power, and the calibrated change temperature; The oven centroid temperature value is obtained according to the real-time temperatures of the upper temperature probe, the left temperature probe and the right temperature probe and the estimated ratio.

8. The estimation method according to claim 7, characterized in that: The step of obtaining the estimated ratio of the upper temperature probe, the left temperature probe, and the right temperature probe according to the real-time power, the delayed power, and the calibrated change temperature includes: The estimated ratio of the left temperature probe is obtained according to the real-time power of the left burner and the right burner, the delayed power of the upper heating tube, and the change temperature of the three temperature probes during the left calibration. The calculation formula is: Among them, TL 比例 is the estimated ratio of the left temperature probe; PL 实时 is the real-time power of the left burner; PR 实时 is the real-time power of the right burner; PU 延迟 is the delay power of the upper heating tube; TL Δ左 TR is the temperature change of the left temperature probe during left calibration; Δ左 is the change in temperature of the right temperature probe during left calibration; TU Δ左 is the changing temperature of the upper temperature probe during left calibration; According to the real-time power of the left burner and the right burner, the delayed power of the upper heating tube, and the change temperature of the three temperature probes during the right calibration, the estimated ratio of the right temperature probe is obtained, and the calculation formula is: Among them, TR 比例 is the estimated ratio of the right temperature probe; PL 实时 is the real-time power of the left burner; PR 实时 is the real-time power of the right burner; PU 延迟 is the delay power of the upper heating tube; TL Δ右 TR is the temperature change of the left temperature probe during the right calibration; Δ右 is the temperature change of the right temperature probe during the right calibration; TU Δ右 is the changing temperature of the upper temperature probe during right calibration; The estimated ratio of the upper temperature probe is obtained according to the real-time power of the left burner and the right burner, the delayed power of the upper heating tube, and the change temperature of the three temperature probes during the upper calibration. The calculation formula is: Among them, TU 比例 is the estimated proportion of the upper temperature probe; PL 实时 is the real-time power of the left burner; PR 实时 is the real-time power of the right burner; PU 延迟 is the delay power of the upper heating tube; TL Δ上 TR is the temperature change of the left temperature probe during the upper calibration; Δ上 is the temperature change of the right temperature probe during the upper calibration; TU Δ上 is the temperature change of the upper temperature probe during the upper calibration.

9. The estimation method according to claim 8, characterized in that: The step of obtaining the oven centroid temperature value according to the real-time temperatures of the upper temperature probe, the left temperature probe, and the right temperature probe and the estimated ratio comprises: The centroid temperature value of the oven is obtained by the second centroid temperature calculation formula, and the second centroid temperature calculation formula is: TC 估算 =TL 比例 *TL 实时 +TR 比例 *TR 实时 +TU 比例 *HERE 实时 ; Among them, TC 估算 is the centroid temperature of the oven; TL 比例 is the estimated ratio of the left temperature probe; TR 比例 is the estimated ratio of the right temperature probe; TU 比例 is the estimated ratio of the upper temperature probe; TL 实时 is the real-time temperature of the left temperature probe; TR 实时 is the real-time temperature of the right temperature probe; TU 实时 It is the real-time temperature of the upper temperature probe.

10. The estimation method according to claim 1, characterized in that: The method of obtaining the calibration change temperature and the thermal inertia delay time of the upper heating tube by temperature calibration of the oven includes: Initialize the gas oven state so that the gas oven is in a cold state and the real-time temperature difference between the upper temperature probe, the left temperature probe and the right temperature probe is less than 1 degree; Obtain the real-time temperatures of the upper temperature probe, the left temperature probe, and the right temperature probe as initial temperatures; If the left calibration is performed, the left burner is heated at maximum power for a preset time and then stops heating, and the real-time temperatures of the upper temperature probe, the left temperature probe and the right temperature probe are obtained as the cutoff temperature; the cutoff temperatures corresponding to the three temperature probes are subtracted from the initial temperature to obtain the change temperatures of the three temperature probes during the left calibration; If right calibration is performed, the right burner is heated at maximum power for a preset time and then stops heating, and the real-time temperatures of the upper temperature probe, the left temperature probe and the right temperature probe are obtained as the cutoff temperature; the cutoff temperature corresponding to the three temperature probes is subtracted from the initial temperature to obtain the change temperature of the three temperature probes of the right calibration; If an upper calibration is performed, the upper heating tube is heated at maximum power for a preset time and then stopped, and the real-time temperatures of the upper temperature probe, the left temperature probe and the right temperature probe are obtained as the cutoff temperature; the cutoff temperature corresponding to the three temperature probes is subtracted from the initial temperature to obtain the changed temperature of the three temperature probes for the right calibration; the time for the temperature of the upper heating tube to rise due to thermal inertia after heating is stopped is taken as the thermal inertia delay time.

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