Diagnostic compensation method, device and storage medium for steam generator of steam oven

Abstract

The present application relates to the field of steam oven control, and discloses a diagnosis compensation method and device for a steam generator of a steam oven, and a storage medium. The method comprises: obtaining initial temperature data and determining a reference temperature; controlling a first steam heating unit to heat alone, obtaining a first temperature sequence at a preset sampling period; performing first state determination processing on the first temperature sequence to obtain a first diagnosis result, and turning off the first steam heating unit; controlling a second steam heating unit to heat alone without performing cooling waiting, and obtaining a second temperature sequence at a preset sampling period; performing second state determination processing on the second temperature sequence to obtain a second diagnosis result, and turning off the second steam heating unit; and performing configuration processing on the working state according to the first diagnosis result and the second diagnosis result to obtain a cooking control strategy. In the embodiment of the present application, the steam heating unit fault diagnosis accuracy is improved, and the reliability of steam cooking control is increased.

Description

Technical Field

[0001] This invention relates to the field of steam oven control, and in particular to a diagnostic compensation method, device and storage medium for a steam generator in a steam oven. Background Technology

[0002] A steam oven is a household appliance that combines steam cooking and baking. It typically includes a steam heating unit to generate steam and a cavity heating unit to heat the cavity. The steam heating unit heats water to produce steam and then delivers the steam into the cavity to heat the food. The operating status of the steam heating unit directly affects the steam generation capacity, and thus the steam cooking effect.

[0003] Steam heating units operate in high-temperature and high-humidity environments for extended periods, and may malfunction due to scaling, dry burning, or component aging, leading to reduced heating capacity or even a complete failure to generate steam. If the malfunction of the steam heating unit is not identified in time, the steam oven may continue to perform steam cooking as normal, potentially resulting in problems such as no steam being generated or food being undercooked. Therefore, it is necessary to inspect the operating status of the steam heating unit.

[0004] For a steam oven with two steam heating units, configuring separate temperature detection units for each unit, while allowing for individual monitoring of their operation, increases the number of detection units and associated wiring, leading to higher hardware costs. If both units share a single temperature detection unit, its temperature may be affected by both units simultaneously. When diagnosing each unit individually, residual heat from the first unit may prevent the shared detection unit from recovering its temperature immediately due to thermal inertia. If subsequent unit diagnoses use the same criteria as the first, the residual heat from the first unit might be mistakenly interpreted as normal temperature rise from the subsequent unit, increasing the risk of misdiagnosis.

[0005] On the other hand, the diagnostic results of the steam heating unit can also affect subsequent steam cooking control. If steam cooking is performed according to the normal procedure when the steam heating unit has lost its ability to generate steam, the cooking effect may be affected. If the steam cooking function is directly disabled due to the failure of only one steam heating unit, the other steam heating unit, which is still in normal condition, cannot be utilized, which can easily cause cooking interruption. Therefore, there is a technical problem with the high probability of misdiagnosis in the existing steam heating unit fault diagnosis, which leads to the diagnostic results affecting the steam cooking control. Summary of the Invention

[0006] The main objective of this invention is to solve the technical problem that the high probability of misdiagnosis in existing steam heating unit fault diagnosis leads to the impact of diagnosis results on steam cooking control.

[0007] The first aspect of this invention provides a diagnostic compensation method for a steam generator in a steam oven. This method is applied to a steam oven, which includes: a first steam heating unit, a second steam heating unit, a shared temperature detection unit thermally coupled to both the first and second steam heating units, and a cavity heating unit for heating the oven cavity. The diagnostic compensation for the steam generator includes: When neither the first steam heating unit nor the second steam heating unit is cooking, the initial temperature data of the shared temperature detection unit is acquired, and a reference temperature is determined based on the initial temperature data. The first steam heating unit is controlled to heat independently, and the first temperature sequence corresponding to the shared temperature detection unit is obtained according to a preset sampling period. Based on the reference temperature and a preset first diagnostic threshold, the first temperature sequence is subjected to a first state determination process to obtain a first diagnostic result characterizing whether the first steam heating unit is normal or faulty, and the first steam heating unit is turned off. Without performing a cooling wait, the second steam heating unit is controlled to heat independently, and the second temperature sequence corresponding to the shared temperature detection unit is obtained according to a preset sampling period; Based on the reference temperature and a preset second diagnostic threshold, the second temperature sequence is subjected to a second state determination process to obtain a second diagnostic result characterizing whether the second steam heating unit is normal or faulty, and the second steam heating unit is turned off, wherein the second diagnostic threshold is greater than the first diagnostic threshold; Based on the first diagnostic result and the second diagnostic result, the working status of the first steam heating unit, the second steam heating unit and the cavity heating unit are configured to obtain a cooking control strategy, and steam cooking heating is performed according to the cooking control strategy to maintain the steam cooking function when at least one steam heating unit is normal, and to disable the steam cooking function when both steam heating units are faulty.

[0008] Optionally, in a first implementation of the first aspect of the present invention, the step of acquiring the initial temperature data of the shared temperature detection unit and determining the reference temperature based on the initial temperature data includes: N initial temperature data points of the shared temperature detection unit are continuously collected within a preset collection period, where N is a positive integer; The stability verification process is performed on the N initial temperature data to obtain the verification results; When the verification result meets the preset stability conditions, a reference temperature is generated based on the N initial temperature data.

[0009] Optionally, in a second implementation of the first aspect of the present invention, the step of performing a first state determination process on the first temperature sequence based on the reference temperature and a preset first diagnostic threshold to obtain a first diagnostic result characterizing whether the first steam heating unit is normal or faulty includes: Based on the reference temperature, the first temperature sequence is subjected to a difference operation to obtain the first temperature rise set; If the first temperature rise in the first temperature rise set is greater than or equal to a preset first diagnostic threshold, then a first diagnostic result characterizing the first steam heating unit as normal is generated. If the first temperature rise in the first temperature rise set is not greater than or equal to a preset first diagnostic threshold, then a first diagnostic result characterizing the fault of the first steam heating unit is generated.

[0010] Optionally, in a third implementation of the first aspect of the present invention, the step of controlling the second steam heating unit to heat independently without performing a cooling wait includes: Without performing a cooling wait, the second steam heating unit is heated independently with preset power control.

[0011] Optionally, in a fourth implementation of the first aspect of the present invention, the step of performing a second state determination process on the second temperature sequence based on the reference temperature and a preset second diagnostic threshold to obtain a second diagnostic result characterizing whether the second steam heating unit is normal or faulty includes: Based on the reference temperature, the second temperature sequence is subjected to a difference operation to obtain the second temperature rise set; If the second temperature rise in the second temperature rise set is greater than or equal to a preset second diagnostic threshold, a second diagnostic result characterizing the second steam heating unit as normal is generated. If the second temperature rise in the second temperature rise set is not greater than or equal to the preset second diagnostic threshold, then a second diagnostic result characterizing the failure of the second steam heating unit is generated.

[0012] Optionally, in a fifth implementation of the first aspect of the present invention, the step of configuring the operating states of the first steam heating unit, the second steam heating unit, and the cavity heating unit based on the first diagnostic result and the second diagnostic result to obtain a cooking control strategy includes: When both the first and second diagnostic results indicate normality, the first and second steam heating units are controlled to heat simultaneously during the preheating stage to generate steam, and the cavity temperature of the steam oven cavity is obtained. When the cavity temperature does not reach the preset switching temperature, the first steam heating unit and the second steam heating unit are continuously controlled to perform steam heating simultaneously. When the cavity temperature reaches the preset switching temperature, the first steam heating unit and the second steam heating unit are controlled to alternately heat independently in order to maintain steam cooking.

[0013] Optionally, in a sixth implementation of the first aspect of the present invention, the step of configuring the operating states of the first steam heating unit, the second steam heating unit, and the cavity heating unit based on the first diagnostic result and the second diagnostic result to obtain a cooking control strategy further includes: When one of the first diagnostic results and the second diagnostic results indicates a fault and the other indicates normal, the steam heating unit corresponding to the diagnostic result indicating normal is determined as the target steam heating unit. During the preheating stage, the target steam heating unit is controlled to heat up to generate steam, and the output power of the cavity heating unit is configured according to the heating power deficiency of the corresponding steam heating unit based on the diagnostic results of the fault characterization, so as to obtain the compensation power. The cavity heating unit is controlled to heat the oven cavity with the compensated power, and the cavity temperature of the oven cavity is obtained; When the cavity temperature reaches the preset switching temperature, the cavity heating unit is turned off, and the target steam heating unit is controlled to heat separately to maintain steam cooking.

[0014] Optionally, in a seventh implementation of the first aspect of the present invention, the step of configuring the operating states of the first steam heating unit, the second steam heating unit, and the cavity heating unit based on the first diagnostic result and the second diagnostic result to obtain a cooking control strategy further includes: When both the first diagnostic result and the second diagnostic result indicate a fault, an alarm message is generated to indicate that the steam cooking function is unavailable, and the alarm message is output. In response to the received mode switching command, the oven is controlled to switch to the baking mode where the cavity heating unit heats the oven separately, so as to continue cooking.

[0015] A second aspect of the present invention provides a diagnostic compensation device for a steam generator in a steam oven, comprising: a memory and at least one processor, wherein the memory stores instructions, and the memory and the at least one processor are interconnected via a circuit; the at least one processor invokes the instructions in the memory to cause the diagnostic compensation device for the steam generator in the steam oven to perform the aforementioned diagnostic compensation method for the steam generator in the steam oven.

[0016] A third aspect of the present invention provides a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the above-described diagnostic compensation method for a steam generator in a steam oven.

[0017] In this embodiment of the invention, by performing sequential diagnosis when the first steam heating unit and the second steam heating unit share a temperature detection unit, and determining the second steam heating unit with a second diagnostic threshold greater than the first diagnostic threshold, the influence of thermal inertia residual temperature on the second diagnostic result is reduced without the need for cooling waiting. At the same time, the working states of the first steam heating unit, the second steam heating unit, and the cavity heating unit are configured according to the first and second diagnostic results. This allows the steam cooking function to be maintained when at least one steam heating unit is normal, and the steam cooking function to be disabled when both steam heating units are faulty. This improves the accuracy of steam heating unit fault diagnosis, thereby increasing the reliability of steam cooking control and solving the technical problem that the probability of misjudgment in existing steam heating unit fault diagnosis is high, which leads to the diagnostic results affecting steam cooking control. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an embodiment of the diagnostic compensation method for the steam generator of a steam oven in this invention. Figure 2 This is a schematic diagram of a specific embodiment of step 103 of the diagnostic compensation method for the steam generator of a steam oven in this invention. Figure 3 This is a schematic diagram of a specific embodiment of step 105 of the diagnostic compensation method for the steam generator of a steam oven in this invention. Figure 4 This is a schematic diagram of temperature changes in the diagnostic compensation method for the steam generator of the steam oven in an embodiment of the present invention; Figure 5 This is a schematic diagram of one embodiment of the diagnostic compensation device for the steam generator of the steam oven in this invention. Detailed Implementation

[0019] This invention provides a diagnostic compensation method, device, and storage medium for a steam generator in a steam oven.

[0020] The embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the accompanying drawings and embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0021] In the description of the embodiments disclosed in this invention, the term "comprising" and similar terms should be understood as open-ended inclusion, i.e., "including but not limited to". The term "based on" should be understood as "at least partially based on". The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment". The terms "first", "second", etc., may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0022] For ease of understanding, the specific process of the embodiments of the present invention is described below. Please refer to [link / reference]. Figure 1 This invention provides an embodiment of a diagnostic compensation method for a steam generator in a steam oven. The method is applied to a steam oven, which includes: a first steam heating unit, a second steam heating unit, a shared temperature detection unit thermally coupled to both the first and second steam heating units, and a cavity heating unit for heating the oven cavity. The diagnostic compensation for the steam generator includes: 101. When neither the first steam heating unit nor the second steam heating unit is cooking, the initial temperature data of the shared temperature detection unit is acquired, and a reference temperature is determined based on the initial temperature data; In this embodiment, the first and second steam heating units are two evaporator heat pipes arranged in parallel at the bottom of the evaporator, each with a rated power of approximately 800W. The shared temperature detection unit is a temperature sensor installed at the midpoint between the two heat pipes. This temperature sensor is thermally coupled to both heat pipes through a heat-conducting medium, allowing a single temperature sensor to detect the heating status of either heat pipe. The cavity heating unit is an upper heating element located at the top of the steam oven cavity, which is typically idle during steam cooking mode. When the user selects a steam cooking function such as "nutritional steaming" on the steam oven's control panel and presses the start button, the control system responds to the start command. In standby mode, before the two steam heating units are powered on, it first reads the initial temperature data output by the shared temperature detection unit. At this time, the shared temperature detection unit is not affected by any heating interference, and its output value reflects the ambient temperature of the steam oven, typically within the range of 20°C to 40°C. For example, if a steam oven is placed in a kitchen environment and the initial temperature data read by the shared temperature detection unit is 25°C, the control system will determine this 25°C as the reference temperature and use it as a unified reference for calculating the temperature rise in the subsequent two fault diagnoses, so as to avoid the failure of the fixed temperature judgment standard due to differences in different seasons and different ambient temperatures.

[0023] Specifically, step 101, "acquiring the initial temperature data of the shared temperature detection unit and determining the reference temperature based on the initial temperature data," includes the following specific implementation methods: 1011. During a preset acquisition period, continuously acquire N initial temperature data from the shared temperature detection unit, where N is a positive integer; 1012. Perform stability verification on the N initial temperature data points to obtain the verification results; 1013. When the verification result meets the preset stability condition, a reference temperature is generated based on the N initial temperature data.

[0024] In steps 1011-1013, considering that the steam oven may have just finished cooking, and there may still be residual heat near the evaporator and the shared temperature detection unit, directly using a single reading as the reference temperature would result in an artificially high reference temperature and an overall deviation in subsequent diagnostic thresholds. Therefore, N initial temperature data points are continuously collected within a preset collection period and their stability is verified.

[0025] For example, if the preset acquisition period is set to 5 seconds and the acquisition frequency is once per second, then N is 5. The control system sequentially acquires five initial temperature data points: 25.2℃, 25.1℃, 25.2℃, 25.0℃, and 25.1℃. Stability verification can be performed using a range verification method, which calculates the difference between the maximum and minimum values ​​of the five initial temperature data points, obtaining a range of 0.2℃, which is then used as the verification result. The preset stability condition is set to a range less than 1℃. Since 0.2℃ is less than 1℃, the verification result meets the preset stability condition, indicating that the temperature of the shared temperature detection unit has stabilized. At this point, the arithmetic mean of the five initial temperature data points is taken, yielding a reference temperature of 25.1℃.

[0026] For example, if the steam oven has just finished baking and the five initial temperature data collected are 62℃, 59℃, 56℃, 53℃, and 51℃, with a range of 11℃, which does not meet the preset stability conditions, it indicates that the temperature is still in a rapid decay process. In this case, the control system will delay for a period of time and then re-enter the preset acquisition period to collect data until the verification result meets the preset stability conditions, thereby ensuring the reliability of the reference temperature.

[0027] 102. Control the first steam heating unit to heat independently, and obtain the first temperature sequence corresponding to the shared temperature detection unit according to a preset sampling period; In this embodiment, after the control system determines the reference temperature, it keeps both the second steam heating unit and the cavity heating unit in a closed state, and only powers the first steam heating unit to heat the evaporator at its rated power of 800W. This eliminates interference from other heating components to the shared temperature detection unit, ensuring that the temperature rise sensed by the shared temperature detection unit originates solely from the first steam heating unit. Simultaneously, the temperature value of the shared temperature detection unit is read according to a preset sampling period. For example, if the preset sampling period is set to 1 second, meaning one sample is taken per second, the multiple temperature values ​​obtained sequentially constitute the first temperature sequence. For instance, when the first steam heating unit is heating normally, the first temperature sequence can be 25.1℃, 26.5℃, 28.3℃, 30.6℃, 33.2℃, and 35.9℃, showing a continuous upward trend. However, when the first steam heating unit cannot heat due to reasons such as a burnt-out heat pipe, the first temperature sequence can be 25.1℃, 25.1℃, 25.2℃, and 25.1℃, essentially remaining near the reference temperature.

[0028] 103. Based on the reference temperature and the preset first diagnostic threshold, perform a first state determination process on the first temperature sequence to obtain a first diagnostic result characterizing whether the first steam heating unit is normal or faulty, and then shut down the first steam heating unit. In this embodiment, the principle of the first diagnostic result is explained as follows: If the first steam heating unit heats up normally, its heat will be transferred to the common temperature detection unit through the thermal coupling effect of the heat transfer medium, causing a significant temperature rise in the first temperature sequence relative to the reference temperature. If the first steam heating unit malfunctions, the first temperature sequence will have virtually no temperature rise relative to the reference temperature. The preset first diagnostic threshold is determined based on the typical temperature rise amplitude transferred to the common temperature detection unit when the heat pipe is heating normally; for example, the first diagnostic threshold is set to 10°C.

[0029] The first state determination process has a preset time limit as the upper limit for determination, for example, set to 20 seconds, meaning the maximum determination time is 20 seconds. For example, if the reference temperature is 25.1℃, and the temperature value of the shared temperature detection unit reaches 35.5℃ about 10 seconds after the first steam heating unit is turned on, the temperature rise relative to the reference temperature is more than 10℃, the first steam heating unit is determined to be normal, the control system immediately shuts down the first steam heating unit and records the first diagnostic result, without waiting for the full 20 seconds, thus shortening the diagnostic time.

[0030] For example, if the temperature value of the shared temperature detection unit is still 25.3°C after the first steam heating unit has been continuously turned on for 20 seconds, and the temperature rise is less than 1°C, then the first steam heating unit is determined to be faulty, the control system shuts down the first steam heating unit and marks the fault status.

[0031] For details, please refer to Figure 2 , Figure 2 This is a schematic diagram of a specific embodiment of step 103 of the diagnostic compensation method for the steam generator of a steam oven in this invention. Step 103 includes the following specific implementation methods: 1031. Based on the reference temperature, perform a difference operation on the first temperature sequence to obtain a first temperature rise set; 1032. If the first temperature rise in the first temperature rise set is greater than or equal to a preset first diagnostic threshold, then a first diagnostic result characterizing the first steam heating unit as normal is generated. 1033. If the first temperature rise in the first temperature rise set does not exceed or equal to a preset first diagnostic threshold, then a first diagnostic result characterizing the fault of the first steam heating unit is generated.

[0032] In steps 1031-1033, the example is taken with a reference temperature of 25.1℃ and a preset first diagnostic threshold of 10℃. The control system subtracts the reference temperature of 25.1℃ from each temperature value in the first temperature sequence, performing difference calculation. For example, if the first temperature sequence is 25.1℃, 26.5℃, 28.3℃, 30.6℃, 33.2℃, and 35.9℃, the resulting first temperature rise set is 0℃, 1.4℃, 3.2℃, 5.5℃, 8.1℃, and 10.8℃. Traversing the first temperature rise set, it is found that there is a first temperature rise of 10.8℃ that is greater than the preset first diagnostic threshold of 10℃. This indicates that the heat generated by the first steam heating unit has been effectively transferred to the common temperature detection unit through thermal coupling, thus generating a first diagnostic result characterizing the first steam heating unit as normal.

[0033] If the first steam heating unit malfunctions, the first temperature sequence within the first preset time period is 25.1℃, 25.1℃, 25.2℃, and 25.1℃. The first temperature rise set obtained by the difference operation is 0℃, 0℃, 0.1℃, and 0℃. There is no first temperature rise greater than or equal to 10℃. Then, a first diagnostic result characterizing the malfunction of the first steam heating unit is generated.

[0034] The diagnostic criteria are determined by the amount of temperature rise rather than the absolute temperature value, so that the diagnostic criteria are not affected by the ambient temperature. For example, the temperature rise relative to the respective reference temperature is used as the basis for judgment when the ambient temperature is 15℃ in winter and 35℃ in summer, thus ensuring the consistency of the diagnostic criteria.

[0035] 104. Control the second steam heating unit to heat independently without performing cooling waiting, and obtain the second temperature sequence corresponding to the shared temperature detection unit according to a preset sampling period; In this embodiment, after the first steam heating unit is turned off, due to the heat storage effect of the heat pipe metal shell and the thermal inertia of the shared temperature detection unit itself, the temperature of the shared temperature detection unit will not immediately drop, but will continue to rise to a residual temperature peak and then slowly decay exponentially. For example, if the first steam heating unit is turned off when the temperature rise reaches 10°C, the temperature of the shared temperature detection unit will continue to climb to a residual temperature peak of about 23°C relative to the reference temperature in the following seconds. If a cooling waiting method is used to eliminate this residual temperature interference, it is measured that it takes several minutes for the shared temperature detection unit to drop back to near the reference temperature, which will significantly prolong the diagnostic process and affect the user experience. Therefore, this embodiment does not set any forced cooling waiting time after the first steam heating unit is turned off, but directly powers on the second steam heating unit to heat it separately, and reads the temperature value of the shared temperature detection unit at a preset sampling period of once per second to obtain the second temperature sequence. This allows the entire dual-unit diagnostic process to be completed within a few seconds to tens of seconds of the steam function startup phase, without being noticed by the user.

[0036] Specifically, step 104 includes the following specific implementation methods: 1041. Without performing a cooling wait, the second steam heating unit is heated independently with a preset power control.

[0037] In step 1041, the preset power can be set to the rated power of the second steam heating unit, such as 800W, so that the second steam heating unit and the first steam heating unit generate heat under the same power conditions, ensuring the comparability of heat transfer rates in the two diagnoses. In other embodiments, the preset power can also be set to a certain percentage of the rated power, as long as it ensures that the second steam heating unit can generate an effective temperature rise exceeding the residual temperature of thermal inertia within the second preset time period when it is operating normally.

[0038] 105. Based on the reference temperature and the preset second diagnostic threshold, perform a second state determination process on the second temperature sequence to obtain a second diagnostic result characterizing whether the second steam heating unit is normal or faulty, and shut down the second steam heating unit, wherein the second diagnostic threshold is greater than the first diagnostic threshold. In this embodiment, since no cooling wait is performed, the shared temperature detection unit still carries the residual heat from the first steam heating unit when the second steam heating unit is turned on. If the same symmetrical threshold scheme as the first diagnostic threshold is used, for example, the second diagnostic threshold is also set to 10°C, but the residual temperature peak has reached approximately 23°C, which is higher than this threshold, the second steam heating unit will be misjudged as normal even when the heat pipe has not actually generated heat, resulting in a serious misdiagnosis. Therefore, this embodiment adopts an asymmetrical threshold design, setting the preset second diagnostic threshold to a value greater than the first diagnostic threshold and completely covering the residual temperature peak. For example, the preset second diagnostic threshold is set to 50°C, which is determined based on the measured residual temperature peak of 23°C plus a safety margin, ensuring that the second steam heating unit must generate an effective temperature rise of at least 27°C to pass the diagnosis, thereby transforming the residual heat from an interfering factor into a known compensation amount. The second state determination process also sets a determination upper limit time, for example, the same as the first preset time, which is 20 seconds.

[0039] For details, please refer to Figure 3 , Figure 3 This is a schematic diagram of a specific embodiment of step 105 of the diagnostic compensation method for the steam generator of a steam oven in this invention. Step 105 includes the following specific implementation methods: 1051. Based on the reference temperature, perform a difference operation on the second temperature sequence to obtain a second temperature rise set; 1052. If the second temperature rise in the second temperature rise concentration is greater than or equal to a preset second diagnostic threshold, a second diagnostic result characterizing the second steam heating unit as normal is generated. 1053. If the second temperature rise in the second temperature rise set does not exceed or equal to the preset second diagnostic threshold, then a second diagnostic result characterizing the fault of the second steam heating unit is generated.

[0040] In steps 1051-1053, taking a reference temperature of 25.1℃ and a preset second diagnostic threshold of 50℃ as an example, the control system subtracts the reference temperature of 25.1℃ from each temperature value in the second temperature sequence, performing difference calculations to obtain the second temperature rise set. For example, when the second steam heating unit is heating normally, its own temperature rise is superimposed on the residual temperature, and the second temperature rise set can be 23℃, 26℃, 30℃, 35℃, 41℃, 47℃, and 53℃. If the second temperature rise of 53℃ is greater than the preset second diagnostic threshold of 50℃, a second diagnostic result indicating that the second steam heating unit is normal is generated, the control system shuts down the second steam heating unit and records the result. For example, when the second steam heating unit malfunctions, the temperature of the shared temperature detection unit changes only according to the exponential decay law of residual heat due to thermal inertia. The second temperature rise set can be 23℃, 22.5℃, 21.8℃, 21℃, and 20.1℃, showing a slow decreasing trend. If there is no second temperature rise greater than or equal to 50℃ within the 20-second judgment period, a second diagnostic result characterizing the second steam heating unit malfunction is generated. It can be seen that even with the interference of 23℃ residual heat, the asymmetric second diagnostic threshold can still accurately distinguish between the actual heating and residual temperature of the second steam heating unit, thus avoiding misjudgment.

[0041] 106. Based on the first diagnostic result and the second diagnostic result, configure the working status of the first steam heating unit, the second steam heating unit and the cavity heating unit to obtain a cooking control strategy, and execute steam cooking heating according to the cooking control strategy to maintain the steam cooking function when at least one steam heating unit is normal, and disable the steam cooking function when both steam heating units are faulty.

[0042] In this embodiment, there are four possible combinations of the first and second diagnostic results: both units are normal, only the first steam heating unit is faulty, only the second steam heating unit is faulty, and both units are faulty. Based on these combinations, the control system performs differentiated configuration processing on the activation, deactivation, and output power of the first, second, and cavity heating units, forming a cooking control strategy that matches the current hardware health status. The design purpose of the cooking control strategy is to maintain the steam cooking function without shutting down during faults when at least one steam heating unit is normal, through unit coordination or compensation; only when both steam heating units are faulty and unable to generate steam will the steam cooking function be disabled and the user be notified, preventing food from being undercooked due to lack of steam.

[0043] Please see Figure 4 , Figure 4 This is a schematic diagram of temperature changes in the diagnostic compensation method for the steam generator of the steam oven in an embodiment of the present invention. Figure 4 The display shows the temperature change of the shared temperature detection unit throughout the diagnostic process, with a reference temperature X. The horizontal axis represents time, and the vertical axis represents the temperature detected by the shared temperature detection unit. This temperature change process can be divided into four stages: The first stage is the baseline stage. Neither the first steam heating unit nor the second steam heating unit is heated. The temperature of the shared temperature detection unit is stable near the baseline temperature X, and the curve is approximately horizontal, for example, X is 25℃.

[0044] The second stage is the first diagnostic stage. The control system turns on the first steam heating unit to heat it separately. The heat is transferred to the common temperature detection unit through the heat transfer medium. The curve rises continuously from X. When the temperature of the first steam heating unit reaches the first diagnostic threshold X+10 degrees after working for about 10 seconds, the first steam heating unit is determined to be normal and is immediately turned off.

[0045] The third stage is the residual temperature inertia stage. Although the first steam heating unit has been shut down, due to the heat storage in the heat pipe's metal casing and the thermal inertia of the shared temperature detection unit itself, the curve does not immediately drop after the shutdown. Instead, it continues to rise for several seconds, climbing to a residual temperature peak of approximately X+23 degrees before starting to turn. Subsequently, it slowly decays exponentially. Actual measurements show that it takes several minutes for the residual temperature to naturally drop back to near the reference temperature. Figure 4 It can be clearly seen that the residual temperature peak of X+23 degrees is significantly higher than the first diagnostic threshold of X+10 degrees. This is precisely why the symmetrical threshold cannot be used for the second steam heating unit. If the second diagnostic threshold is still set to X+10 degrees, the second steam heating unit will be misjudged as normal even if it does not generate heat, as long as the residual temperature exceeds the threshold.

[0046] The fourth stage is the second diagnostic stage. The control system, without waiting for the residual heat to dissipate, directly activates the second steam heating unit. If the second steam heating unit is functioning normally, the temperature rise generated by its own heating is superimposed on the residual heat, and the curve continues to climb from approximately X+23 degrees Celsius, exceeding the second diagnostic threshold X+50 degrees Celsius within a 20-second judgment period, thus indicating normal operation. If the second steam heating unit malfunctions, no new heat is injected, and the curve only slowly declines along the exponential decay trajectory of the residual heat, always remaining well below X+50 degrees Celsius, indicating a malfunction.

[0047] Depend on Figure 4As can be seen, a safety margin of 27 degrees is reserved between the second diagnostic threshold X+50 degrees and the residual temperature peak X+23 degrees. That is, the second steam heating unit must generate an effective temperature rise of at least 27 degrees to pass the diagnosis. The thermal inertia residual temperature is thus converted into a known compensation amount rather than an interfering factor, which not only ensures the accuracy of the diagnosis, but also saves the cooling waiting time, so that the entire diagnostic process can be embedded in the steam function start-up stage for rapid completion.

[0048] Specifically, in the first strategy, step 106, "configuring the working states of the first steam heating unit, the second steam heating unit, and the cavity heating unit based on the first diagnostic result and the second diagnostic result to obtain a cooking control strategy," includes the following specific implementation methods: 1061. When both the first diagnostic result and the second diagnostic result indicate normality, during the preheating stage, the first steam heating unit and the second steam heating unit are controlled to heat simultaneously to generate steam, and the cavity temperature of the steam oven cavity is obtained. 1062. When the cavity temperature does not reach the preset switching temperature, the first steam heating unit and the second steam heating unit are continuously controlled to perform steam heating simultaneously. 1063. When the cavity temperature reaches the preset switching temperature, the first steam heating unit and the second steam heating unit are controlled to alternately heat independently to maintain steam cooking.

[0049] In steps 1061-1063, taking the case where both units are functioning normally as an example, after the user starts steam cooking, the cavity is in the preheating stage. The control system simultaneously activates the first and second steam heating units, which together heat the evaporator with a combined power of approximately 1600W, rapidly generating a large amount of steam and causing the cavity temperature to rise quickly. During this process, the control system continuously monitors the cavity temperature of the steam oven. The preset switching temperature can be set to 100℃, which is the steam maintenance temperature. For example, if the cavity temperature is 85℃, before reaching the preset switching temperature of 100℃, the control system continues to maintain simultaneous heating of both units. Once the cavity temperature reaches 100℃, the steam in the cavity is nearly saturated, and continuing full-power heating of both units would waste energy. The control system then switches to a single-tube alternating maintenance mode, for example, controlling the first steam heating unit to work for 30 seconds and then turn it off, followed by the second steam heating unit working for 30 seconds, and so on, alternating in this cycle. While maintaining sufficient steam in the cavity to meet cooking requirements, this reduces the power consumption of the steam heating units by approximately 50% and balances the cumulative working time of the two heat pipes, thereby extending the lifespan of the components.

[0050] Specifically, in the second strategy, step 106, "configuring the working states of the first steam heating unit, the second steam heating unit, and the cavity heating unit based on the first diagnostic result and the second diagnostic result to obtain a cooking control strategy," includes the following specific implementation methods: 1064. When one of the first diagnostic results and the second diagnostic results indicates a fault and the other indicates normal, the steam heating unit corresponding to the diagnostic result indicating normal is determined as the target steam heating unit. 1065. During the preheating stage, the target steam heating unit is controlled to heat to generate steam, and the output power of the cavity heating unit is configured according to the heating power deficiency of the corresponding steam heating unit based on the diagnostic results of the fault characterization, so as to obtain the compensation power. 1066. Control the cavity heating unit to heat the steam oven cavity with the compensated power, and obtain the cavity temperature of the steam oven cavity; 1067. When the cavity temperature reaches the preset switching temperature, the cavity heating unit is turned off, and the target steam heating unit is controlled to heat separately to maintain steam cooking.

[0051] In steps 1064-1067, taking the case of a faulty first steam heating unit and a normal second steam heating unit as an example, the control system identifies the second steam heating unit as the target steam heating unit. During the preheating stage, steam is generated solely by the target steam heating unit at its rated power of 800W. Compared to the normal dual-unit state, the approximately 800W heating power of the faulty first steam heating unit is missing. Without compensation, the cavity heating rate will significantly decrease, and the preheating time will be prolonged.

[0052] To address this, the control system adjusts the output power of the cavity heating unit based on the 800W heating power deficiency. For example, it configures the output power of the cavity heating unit to 80% of its rated power, thus obtaining a compensation power. The control system uses this compensation power to assist in heating the oven cavity, compensating for the lack of steam heat power and bringing the cavity heating rate closer to the normal operation of the dual-unit system. The control system continuously monitors the cavity temperature. When the cavity temperature reaches the preset switching temperature of 100°C, the preheating phase ends, and the control system shuts off the cavity heating unit to prevent overheating and drying of the food. Only the target steam heating unit maintains steam production, and the amount of steam generated during the single-unit maintenance phase is sufficient to meet cooking needs.

[0053] The situation is symmetrical when the second steam heating unit fails while the first steam heating unit is functioning normally. In this case, the first steam heating unit is designated as the target steam heating unit, and the control logic is the same. Therefore, the impact of a single-unit failure on the user is reduced from disabling the steam function to a slight performance decrease, ensuring that the user's cooking session is not interrupted.

[0054] Specifically, in the third strategy, step 106, "configuring the working states of the first steam heating unit, the second steam heating unit, and the cavity heating unit based on the first diagnostic result and the second diagnostic result to obtain a cooking control strategy," includes the following specific implementation methods: 1068. When both the first diagnostic result and the second diagnostic result indicate a fault, an alarm message is generated to indicate that the steam cooking function is unavailable, and the alarm message is output. 1069. In response to the received mode switching command, control the steam oven to switch to the baking mode where the cavity heating unit heats the oven separately, so as to continue cooking.

[0055] In steps 1068-1069, we take the case of both units failing as an example. At this point, the steam oven has completely lost its steam generation capability. If steam cooking is still allowed, the food will remain in a steam-free environment for an extended period and thus be undercooked. Therefore, the control system generates and outputs an alarm message to indicate that the steam cooking function is unavailable. For example, it may emit a buzzer sound while simultaneously displaying the text "Steam function malfunction, please contact after-sales service" on the screen, creating an audible and visual alarm and preventing the steam cooking mode from being activated. Furthermore, the user can issue a mode switching command via the control panel. The control system responds to this command, switching the steam oven to a baking mode where the cavity heating unit heats the food separately. The food originally planned for steaming can then be cooked using baking, thus preserving a usable cooking path for the user even when the steam function is completely unavailable.

[0056] In this embodiment of the invention, by performing sequential diagnosis when the first steam heating unit and the second steam heating unit share a temperature detection unit, and determining the second steam heating unit with a second diagnostic threshold greater than the first diagnostic threshold, the influence of thermal inertia residual temperature on the second diagnostic result is reduced without the need for cooling waiting. At the same time, the working states of the first steam heating unit, the second steam heating unit, and the cavity heating unit are configured according to the first and second diagnostic results. This allows the steam cooking function to be maintained when at least one steam heating unit is normal, and the steam cooking function to be disabled when both steam heating units are faulty. This improves the accuracy of steam heating unit fault diagnosis, thereby increasing the reliability of steam cooking control and solving the technical problem that the probability of misjudgment in existing steam heating unit fault diagnosis is high, which leads to the diagnostic results affecting steam cooking control.

[0057] Figure 5This is a schematic diagram of the structure of a diagnostic compensation device 500 for a steam generator in a steam oven, provided in an embodiment of the present invention. The diagnostic compensation device 500 for the steam generator can vary considerably depending on its configuration or performance, and may include one or more central processing units (CPUs) 510 and a memory 520, and one or more storage media 530 storing application programs 533 or data 532. The memory 520 and storage media 530 can be temporary or persistent storage. The program stored in the storage media 530 may include one or more modules (not shown in the diagram), each module including a series of instruction operations on the diagnostic compensation device 500 for the steam generator. Furthermore, the processor 510 may be configured to communicate with the storage media 530 and execute the series of instruction operations in the storage media 530 on the diagnostic compensation device 500 for the steam generator.

[0058] The diagnostic compensation device 500 based on the steam generator of a steam oven may also include one or more power supplies 540, one or more wired or wireless network interfaces 550, one or more input / output interfaces 560, and / or one or more operating systems 531, such as Windows Server, Mac OS X, Unix, Linux, Free BSD, etc. Those skilled in the art will understand that... Figure 5 The diagnostic compensation device structure of the steam generator of the steam oven shown does not constitute a limitation on the diagnostic compensation device based on the steam generator of the steam oven. It may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0059] The present invention also provides a computer-readable storage medium, which may be a non-volatile computer-readable storage medium or a volatile computer-readable storage medium, wherein the computer-readable storage medium stores instructions that, when executed on a computer, cause the computer to perform the steps of the diagnostic compensation method for the steam generator of the steam oven.

[0060] In the context of this disclosure, a machine-readable medium can be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can be, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0061] Furthermore, although the operations are described in a specific order, this should be understood as requiring that such operations be performed in the specific order shown or in sequential order, or requiring that all illustrated operations be performed to achieve the desired result. In certain environments, multitasking and parallel processing may be advantageous. Similarly, although several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of this disclosure. Certain features described in the context of individual embodiments may also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation may also be implemented individually or in any suitable sub-combination in multiple implementations.

[0062] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

Claims

1. A diagnostic compensation method for a steam generator in a steam oven, characterized in that, The diagnostic compensation method for the steam generator of the steam oven is applied to the steam oven, which includes: a first steam heating unit, a second steam heating unit, a common temperature detection unit thermally coupled to both the first and second steam heating units, and a cavity heating unit for heating the oven cavity. The diagnostic compensation for the steam generator of the steam oven includes: When neither the first steam heating unit nor the second steam heating unit is cooking, the initial temperature data of the shared temperature detection unit is acquired, and a reference temperature is determined based on the initial temperature data. The first steam heating unit is controlled to heat independently, and the first temperature sequence corresponding to the shared temperature detection unit is obtained according to a preset sampling period. Based on the reference temperature and a preset first diagnostic threshold, the first temperature sequence is subjected to a first state determination process to obtain a first diagnostic result characterizing whether the first steam heating unit is normal or faulty, and the first steam heating unit is turned off. Without performing a cooling wait, the second steam heating unit is controlled to heat independently, and the second temperature sequence corresponding to the shared temperature detection unit is obtained according to a preset sampling period; Based on the reference temperature and a preset second diagnostic threshold, the second temperature sequence is subjected to a second state determination process to obtain a second diagnostic result characterizing whether the second steam heating unit is normal or faulty, and the second steam heating unit is turned off, wherein the second diagnostic threshold is greater than the first diagnostic threshold; Based on the first diagnostic result and the second diagnostic result, the working status of the first steam heating unit, the second steam heating unit and the cavity heating unit are configured to obtain a cooking control strategy, and steam cooking heating is performed according to the cooking control strategy to maintain the steam cooking function when at least one steam heating unit is normal, and to disable the steam cooking function when both steam heating units are faulty.

2. The diagnostic compensation method for the steam generator of a steam oven according to claim 1, characterized in that, The step of acquiring the initial temperature data of the shared temperature detection unit and determining the reference temperature based on the initial temperature data includes: N initial temperature data points of the shared temperature detection unit are continuously collected within a preset collection period, where N is a positive integer; The stability verification process is performed on the N initial temperature data to obtain the verification results; When the verification result meets the preset stability conditions, a reference temperature is generated based on the N initial temperature data.

3. The diagnostic compensation method for the steam generator of a steam oven according to claim 1, characterized in that, The step of performing a first state determination process on the first temperature sequence based on the reference temperature and a preset first diagnostic threshold to obtain a first diagnostic result characterizing whether the first steam heating unit is normal or faulty includes: Based on the reference temperature, the first temperature sequence is subjected to a difference operation to obtain the first temperature rise set; If the first temperature rise in the first temperature rise set is greater than or equal to a preset first diagnostic threshold, then a first diagnostic result characterizing the first steam heating unit as normal is generated. If the first temperature rise in the first temperature rise set is not greater than or equal to a preset first diagnostic threshold, then a first diagnostic result characterizing the fault of the first steam heating unit is generated.

4. The diagnostic compensation method for the steam generator of a steam oven according to claim 1, characterized in that, The step of controlling the second steam heating unit to heat independently without performing a cooling wait includes: Without performing a cooling wait, the second steam heating unit is heated independently with preset power control.

5. The diagnostic compensation method for the steam generator of a steam oven according to claim 1, characterized in that, The step of performing a second state determination process on the second temperature sequence based on the reference temperature and a preset second diagnostic threshold to obtain a second diagnostic result characterizing whether the second steam heating unit is normal or faulty includes: Based on the reference temperature, the second temperature sequence is subjected to a difference operation to obtain the second temperature rise set; If the second temperature rise in the second temperature rise set is greater than or equal to the preset second diagnostic threshold, then a second diagnostic result characterizing the second steam heating unit as normal is generated. If the second temperature rise in the second temperature rise set is not greater than or equal to the preset second diagnostic threshold, then a second diagnostic result characterizing the failure of the second steam heating unit is generated.

6. The diagnostic compensation method for the steam generator of a steam oven according to claim 1, characterized in that, The step of configuring the operating states of the first steam heating unit, the second steam heating unit, and the cavity heating unit based on the first diagnostic result and the second diagnostic result to obtain a cooking control strategy includes: When both the first and second diagnostic results indicate normality, the first and second steam heating units are controlled to heat simultaneously during the preheating stage to generate steam, and the cavity temperature of the steam oven cavity is obtained. When the cavity temperature does not reach the preset switching temperature, the first steam heating unit and the second steam heating unit are continuously controlled to perform steam heating simultaneously. When the cavity temperature reaches the preset switching temperature, the first steam heating unit and the second steam heating unit are controlled to alternately heat independently in order to maintain steam cooking.

7. The diagnostic compensation method for the steam generator of a steam oven according to claim 1, characterized in that, The step of configuring the operating states of the first steam heating unit, the second steam heating unit, and the cavity heating unit based on the first diagnostic result and the second diagnostic result to obtain the cooking control strategy further includes: When one of the first diagnostic results and the second diagnostic results indicates a fault and the other indicates normal, the steam heating unit corresponding to the diagnostic result indicating normal is determined as the target steam heating unit. During the preheating stage, the target steam heating unit is controlled to heat up to generate steam, and the output power of the cavity heating unit is configured according to the heating power deficiency of the corresponding steam heating unit based on the diagnostic results of the fault characterization, so as to obtain the compensation power. The cavity heating unit is controlled to heat the oven cavity with the compensated power, and the cavity temperature of the oven cavity is obtained; When the cavity temperature reaches the preset switching temperature, the cavity heating unit is turned off, and the target steam heating unit is controlled to heat separately to maintain steam cooking.

8. The diagnostic compensation method for the steam generator of a steam oven according to claim 1, characterized in that, The step of configuring the operating states of the first steam heating unit, the second steam heating unit, and the cavity heating unit based on the first diagnostic result and the second diagnostic result to obtain the cooking control strategy further includes: When both the first diagnostic result and the second diagnostic result indicate a fault, an alarm message is generated to indicate that the steam cooking function is unavailable, and the alarm message is output. In response to the received mode switching command, the oven is controlled to switch to the baking mode where the cavity heating unit heats the oven separately, so as to continue cooking.

9. A diagnostic compensation device for a steam generator in a steam oven, characterized in that, The diagnostic compensation device for the steam generator of the steam oven includes: a memory and at least one processor, wherein the memory stores instructions, and the memory and the at least one processor are interconnected via a line; The at least one processor invokes the instructions in the memory to cause the diagnostic compensation device of the steam generator of the steam oven to perform the diagnostic compensation method of the steam generator of the steam oven as described in any one of claims 1-8.

10. A computer-readable storage medium storing a computer program thereon, characterized in that, When the computer program is executed by the processor, it implements the diagnostic compensation method for the steam generator of the steam oven as described in any one of claims 1-8.

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