Furnace surface temperature sensor detection method and device

Abstract

The present invention provides a method and device for detecting a stove surface temperature sensor, relating to the technical field of kitchen appliances. The method comprises the following steps: obtaining a temperature value detected by the stove surface temperature sensor; comparing the temperature value with a temperature threshold when the change in the temperature value within a first preset time period is less than or equal to the first preset change; determining that the stove surface temperature sensor has failed when the temperature value is less than the temperature threshold; reducing the heating power of the stove when the temperature value is greater than the temperature threshold and monitoring the temperature value within a second preset time period; determining that the stove surface temperature sensor has failed when the change in the temperature value within the second preset time period is less than or equal to the second preset change. After the temperature value exceeds the temperature threshold, determining whether the stove surface temperature sensor has failed by reducing the heating power and monitoring the change in the temperature value within the second preset time period, thereby enabling detection of stove surface temperature sensor failure under all temperature ranges.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen appliances, and in particular to a method and device for detecting a stove surface temperature sensor. Background Art

[0002] As a product of the new generation of kitchen innovation, induction cooktops have entered every household. Compared with traditional gas stoves, they have the advantages of high efficiency, energy saving, safety and environmental protection.

[0003] During the heating process, the induction cooker needs to use the furnace surface temperature sensor to transmit the temperature signal to the control circuit, so as to measure and control the furnace surface temperature to prevent the induction cooker from overheating and ensure safety.

[0004] In the prior art, when the induction cooker is turned on and heating normally, the stove surface temperature sensor will perform real-time detection when the temperature is below a certain temperature (generally 50°C). If the temperature detected by the stove surface temperature sensor does not change after heating for a period of time, it will be judged that the stove surface temperature sensor has failed.

[0005] However, this detection method still has some problems. If the temperature corresponding to the furnace surface temperature sensor failure parameter is above 50°C (such as 80°C), the temperature information transmitted to the control circuit is outside the detection temperature range. Therefore, the furnace surface temperature sensor failure will not be detected, and it will not be possible to detect the failure of the furnace surface temperature sensor and activate the corresponding over-temperature protection. If the detection temperature range is expanded (for example, changing to real-time detection below 70°C), when the temperature is stable (such as low-power heating or the fixed temperature function of an induction cooker), false alarms are likely to occur. In summary, the accuracy of furnace surface temperature sensor failure detection is not high. Summary of the Invention

[0006] The object of the present invention is to provide a furnace surface temperature sensor detection method to solve the technical problem of low accuracy in furnace surface temperature sensor failure detection in the prior art.

[0007] The furnace surface temperature sensor detection method provided by the present invention comprises the following steps:

[0008] Get the temperature value detected by the furnace surface temperature sensor;

[0009] When the change in the temperature value within the first preset time period is less than or equal to the first preset change, comparing the temperature value with the temperature threshold;

[0010] When the temperature value is less than the temperature threshold, it is determined that the furnace surface temperature sensor is invalid;

[0011] When the temperature value is greater than the temperature threshold, the heating power of the stove is reduced and the temperature value is monitored within a second preset time period. When the change in the temperature value within the second preset time period is less than or equal to the second preset change, it is determined that the stove surface temperature sensor has failed.

[0012] Furthermore, before the step of monitoring the temperature value within the first preset time period, the method further includes the following steps:

[0013] Obtain the heating power value of the stove and compare the heating power value with the preset power value;

[0014] When the heating power value is greater than the preset power value, it is determined that the stove is in the first gear, and the first preset time period is T1;

[0015] When the heating power value is less than the preset power value, it is determined that the stove is in the second gear, and the first preset time period is T2; T1<T2.

[0016] Furthermore, after determining that the furnace surface temperature sensor has failed, the furnace is controlled to stop heating.

[0017] Furthermore, in the step of reducing the heating power of the stove and monitoring the temperature value within the second preset time period, when the change in the temperature value within the second preset time period is greater than the second preset change, it is determined that the stove surface temperature sensor is normal.

[0018] Furthermore, when the temperature value is greater than the temperature threshold and the furnace surface temperature sensor is determined to be normal, the heating power of the furnace is increased to the initial heating power.

[0019] Furthermore, the T1 is 5 minutes to 7 minutes, and the T2 is 10 minutes to 12 minutes.

[0020] Furthermore, when the ambient temperature of the stove is 25° C., the lowest stable temperature that can be reached by the stove using the second gear for heating time T2 is the temperature threshold.

[0021] Furthermore, when the heating power of the stove is reduced, the reduction in heating power is 30%-70%.

[0022] Furthermore, the second preset time period is 30 seconds to 60 seconds.

[0023] Furthermore, the first preset change amount and the second preset change amount are both 0.

[0024] The present invention also aims to provide a furnace surface temperature sensor detection device, comprising a temperature acquisition module, a first temperature monitoring module, a second temperature monitoring module, a temperature comparison module, a power adjustment module and a main control module;

[0025] The temperature acquisition module is used to connect to the furnace surface temperature sensor, and the temperature acquisition module is used to obtain the temperature value detected by the furnace surface temperature sensor;

[0026] The first temperature monitoring module and the second temperature monitoring module are respectively connected to the temperature acquisition module; the first temperature monitoring module is used to monitor the change of the temperature value within a first preset time period; the second temperature monitoring module is used to monitor the change of the temperature value within a second preset time period;

[0027] The temperature comparison module is connected to the temperature acquisition module, and the temperature comparison module is used to compare the temperature value with the temperature threshold;

[0028] The power regulating module is used to be connected to the heating device of the stove, and the power regulating module is used to regulate the heating power of the stove;

[0029] The first temperature monitoring module, the second temperature monitoring module, the temperature comparison module and the power regulation module are respectively connected to the main control module.

[0030] Furthermore, the furnace surface temperature sensor detection device further includes a power acquisition module and a gear position determination module connected to each other;

[0031] The power acquisition module is used to connect to the heating device of the stove, and the power acquisition module is used to obtain the heating power value of the stove;

[0032] The gear position judgment module is used to compare the heating power value of the stove with the preset power value; the gear position judgment module is connected to the main control module.

[0033] Furthermore, when the change in the temperature value within the first preset time period is less than or equal to the first preset change and the temperature value is less than the temperature threshold, the furnace surface temperature sensor is in a failure state.

[0034] Furthermore, when the temperature value is greater than the temperature threshold and the change in the temperature value within the second preset time period is less than or equal to the second preset change, the furnace surface temperature sensor is in a failure state.

[0035] The furnace surface temperature sensor detection method provided by the present invention, when the change amount of the temperature value within the first preset time period is less than or equal to the first preset change amount, if the temperature value is less than the temperature threshold, it can be determined that the furnace surface temperature sensor has failed, and whether the furnace surface temperature sensor has failed can be detected in real time; if the temperature value is greater than the temperature threshold, since the furnace surface temperature sensor has failed, its resistance range will become smaller, resulting in a decrease in the maximum temperature it can detect. When the actual temperature is greater than the maximum temperature that the furnace surface temperature sensor can detect, the resistance value of the temperature sensor remains unchanged, resulting in the temperature value transmitted to the furnace surface temperature sensor detection device being always the maximum temperature that the temperature sensor can detect, and the actual temperature will be greater than the maximum temperature that the temperature sensor can detect. It is much greater than the maximum temperature that the temperature sensor can detect; therefore, when the heating power is reduced, the actual temperature will decrease. If the furnace surface temperature sensor fails, the temperature drop cannot be detected, and the temperature value transmitted to the furnace surface temperature sensor detection device is still the maximum temperature that the temperature sensor can detect; therefore, after the temperature value exceeds the temperature threshold, the furnace surface temperature sensor can be determined to be failed by reducing the heating power and monitoring the change in the temperature value within a second preset time period. This can realize the failure detection of the furnace surface temperature sensor under all temperature conditions, and can avoid the false alarm when the temperature value reaches a stable state, so as to improve the accuracy of the failure detection of the furnace surface temperature sensor. In addition, the heating power value of the stove is received in real time, and the heating power value is compared with the preset power value; when the heating power value is greater than the preset power value, the stove is judged to be in the first gear; when the heating power value is less than the preset power value, the stove is judged to be in the second gear; depending on the gear, when the stove is in the first gear, the first preset time period is T1; when the stove is in the second gear, the first preset time period is T2; T1 < T2; the first preset time of the high-power state is shorter, and the first preset time of the low-power state is longer, the purpose is to ensure that the stove can reach a stable temperature when heating at low power, to prevent false alarms; failure detection can be performed as soon as possible during high-power heating to prevent untimely alarms. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 is a flow chart of a furnace surface temperature sensor detection method provided by an embodiment of the present invention;

[0038] Figure 2 It is a principle diagram of a furnace surface temperature sensor detection device provided by an embodiment of the present invention.

[0039] Icons: 1-main control module; 2-temperature acquisition module; 3-furnace surface temperature sensor; 4-first temperature monitoring module; 5-temperature comparison module; 6-second temperature monitoring module; 7-gear position judgment module; 8-power acquisition module. DETAILED DESCRIPTION

[0040] The following is a clear and initial description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0041] The present invention provides a furnace surface temperature sensor detection method and device. The following provides multiple embodiments to describe the furnace surface temperature sensor detection method and device provided by the present invention in detail.

[0042] The furnace surface temperature sensor detection method provided in this embodiment is as follows: Figure 1 As shown, the following steps are included:

[0043] Obtain the temperature value detected by the furnace surface temperature sensor 3;

[0044] When the change in the temperature value within the first preset time period is less than or equal to the first preset change, comparing the temperature value with the temperature threshold;

[0045] When the temperature value is less than the temperature threshold, it is determined that the furnace surface temperature sensor 3 is invalid;

[0046] When the temperature value is greater than the temperature threshold, the heating power of the stove is reduced and the temperature value is monitored within a second preset time period. When the change in the temperature value within the second preset time period is greater than the second preset change, it is judged that the furnace surface temperature sensor 3 is normal; when the change in the temperature value within the second preset time period is less than or equal to the second preset change, it is judged that the furnace surface temperature sensor 3 has failed.

[0047] The first preset change amount and the second preset change amount can be specific values ​​(such as 0, 0.1 or 0.2, etc.), or preset deviation ranges (such as ±0.1°C, ±0.2°C or ±0.3°C, etc.). Preferably, the first preset change amount and the second preset change amount are both 0.

[0048] When the temperature value is less than the temperature threshold, it is possible to detect in real time whether the furnace surface temperature sensor 3 has failed. When the temperature value is greater than the temperature threshold, it is possible to detect whether the furnace surface temperature sensor 3 has failed by reducing the heating power of the stove and monitoring the change in the temperature value within a second preset time period. This can realize the failure detection of the furnace surface temperature sensor 3 under full temperature conditions, thereby improving the accuracy of the failure detection of the furnace surface temperature sensor 3.

[0049] The temperature threshold value may be preset in the furnace surface temperature sensor detection device.

[0050] Specifically, after the user turns on the stove, the stove starts heating. When the temperature value received by the stove surface temperature sensor detection device remains unchanged or the change is within the preset deviation range within the first preset time period, the stove surface temperature sensor detection device compares the temperature value at this time with the temperature threshold (K1). If the temperature value is less than the temperature threshold (K1), it is determined that the stove surface temperature sensor 3 has failed.

[0051] If the temperature value is greater than the temperature threshold (K1), the heating power of the stove is reduced, and the temperature value is monitored for a second preset time period (T3) to see whether it remains unchanged or changes within a preset deviation range. If the temperature value remains unchanged or changes within the preset deviation range, it indicates that the stove surface temperature sensor 3 has failed; if the temperature value changes or the change is not within the preset deviation range, it indicates that the stove surface temperature sensor 3 is normal.

[0052] When furnace surface temperature sensor 3 fails, its resistance range decreases, lowering the maximum detectable temperature. When the actual temperature exceeds the maximum detectable temperature of furnace surface temperature sensor 3, the resistance of furnace surface temperature sensor 3 remains unchanged, causing the temperature value transmitted to the furnace surface temperature sensor detection device to remain at the maximum detectable temperature of furnace surface temperature sensor 3, even though the actual temperature may be significantly higher than this value. Therefore, when the heating power is reduced, the actual temperature of the system decreases. If furnace surface temperature sensor 3 fails, the temperature drop cannot be detected, and the temperature value transmitted to the furnace surface temperature sensor detection device remains at the maximum detectable temperature of furnace surface temperature sensor 3.

[0053] It should be noted that the preset deviation range can be ±a%, or ±b°C.

[0054] Furthermore, the method further comprises the following steps:

[0055] Obtain the heating power value of the stove and compare the heating power value with the preset power value;

[0056] When the heating power value is greater than the preset power value, it is determined that the stove is in the first gear, and the first preset time period is T1;

[0057] When the heating power value is less than the preset power value, it is determined that the stove is in the second gear, and the first preset time period is T2; T1<T2.

[0058] Specifically, after the user turns on the stove and starts heating, the stove surface temperature sensor detects the stove's heating power value in real time and compares it with a preset power value (P0). If the heating power value is greater than the preset power value, the stove is determined to be in the first gear; if the heating power value is less than the preset power value, the stove is determined to be in the second gear.

[0059] The value of P0 may be the middle value of the heating power of all gears, or the heating gears may be classified (eg, if there are 10 gears in total, gears 1-5 are defined as the first gear, and gears 6-10 are defined as the second gear).

[0060] According to different gears, when the stove is in the first gear, the first preset time period is T1; when the stove is in the second gear, the first preset time period is T2.

[0061] The high-power heating time is short, and the low-power heating time is long. The purpose is to ensure that the stove reaches a stable temperature when heating at low power to prevent false alarms; when heating at high power, failure detection can be performed as soon as possible to prevent untimely alarms.

[0062] Among them, T1 can be 5 minutes to 7 minutes, and T2 can be 10 minutes to 12 minutes.

[0063] Furthermore, the temperature threshold is the lowest stable temperature that can be reached by the stove at normal room temperature (25° C.) when heating at the second power level for T2, and is generally preferably 50° C.

[0064] Furthermore, after determining that the furnace surface temperature sensor 3 has failed, the furnace is controlled to stop heating to prevent the furnace from overheating, thereby improving the safety of the furnace.

[0065] Furthermore, when the temperature value is greater than the temperature threshold and it is determined that the furnace surface temperature sensor 3 is normal, the heating power of the furnace is increased to the initial heating power.

[0066] It should be noted that the initial heating power refers to the original heating power before the heating power is reduced.

[0067] After determining that the stove surface temperature sensor 3 is normal, the heating power is restored to the initial heating power, which can ensure the normal operation of the induction cooker.

[0068] Furthermore, when the heating power of the stove is reduced, the reduction range of the heating power is 30% to 70%. The second preset time period (T3) is 30 seconds to 60 seconds.

[0069] If the heating power decreases significantly, the selection of T3 can be reduced accordingly; if the heating power decreases slightly, the selection of T3 can be increased accordingly, as long as the temperature value can be slightly reduced to outside the second preset change range.

[0070] The heating power of the stove should not be reduced to 0 as much as possible. If the heating power is reduced to 0, it may easily give users the illusion that the equipment is malfunctioning, affecting the user experience.

[0071] Alternatively, the heating power can be reduced by a fixed value, as long as the temperature drop is small enough to be detected.

[0072] In this embodiment, the furnace surface temperature sensor 3 may be a thermistor type or a thermocouple type.

[0073] The furnace surface temperature sensor detection method provided in this embodiment can detect in real time whether the furnace surface temperature sensor 3 has failed when the temperature value is less than the temperature threshold. When the temperature value is greater than the temperature threshold, it detects whether the furnace surface temperature sensor 3 has failed by reducing the heating power of the stove and monitoring the change in the temperature value within a second preset time period. This can realize the failure detection of the furnace surface temperature sensor 3 under all temperature conditions, thereby improving the accuracy of the failure detection of the furnace surface temperature sensor 3.

[0074] The furnace surface temperature sensor detection device provided in this embodiment is as follows: Figure 2 As shown, it includes a temperature acquisition module 2, a first temperature monitoring module 4, a second temperature monitoring module 6, a temperature comparison module 5, a power regulation module and a main control module 1; the temperature acquisition module 2 is used to connect with the furnace surface temperature sensor 3, and the temperature acquisition module 2 is used to obtain the temperature value detected by the furnace surface temperature sensor 3; the first temperature monitoring module 4 and the second temperature monitoring module 6 are respectively connected to the temperature acquisition module 2; the first temperature monitoring module 4 is used to monitor the change in the temperature value within a first preset time period; the second temperature monitoring module 6 is used to monitor the change in the temperature value within a second preset time period; the temperature comparison module 5 is connected to the temperature acquisition module 2, and the temperature comparison module 5 is used to compare the temperature value with the temperature threshold; the power regulation module is used to connect with the heating device of the stove, and the power regulation module is used to adjust the heating power of the stove; the first temperature monitoring module 4, the second temperature monitoring module 6, the temperature comparison module 5 and the power regulation module are respectively connected to the main control module 1.

[0075] Specifically, the first temperature monitoring module 4 is connected to the temperature acquisition module 2, and the first temperature monitoring module 4 can receive the temperature value detected by the furnace surface temperature sensor 3. The first temperature monitoring module 4 is used to monitor the change in the temperature value within a first preset time period; when the change in the temperature value within the first preset time period is less than or equal to the first preset change, the first temperature monitoring module 4 can send a comparison instruction to the main control module 1; the main control module 1 sends the comparison instruction to the temperature comparison module 5, and the temperature comparison module 5 can compare the temperature value with the temperature threshold according to the comparison instruction; when the temperature value is less than the temperature threshold, the main control module 1 determines that the furnace surface temperature sensor 3 is invalid; when the temperature value is greater than the temperature threshold, the main control module 1 can send an adjustment instruction and a temperature monitoring instruction; the power adjustment module reduces the heating power of the stove according to the adjustment instruction; the second temperature monitoring module 6 monitors the change in the temperature value within a second preset time period according to the temperature monitoring instruction; after the heating power of the stove is reduced, when the change in the temperature value within the second preset time period is less than or equal to the first preset change, the main control module 1 determines that the furnace surface temperature sensor 3 is invalid.

[0076] The first preset change amount and the second preset change amount can be specific values ​​(e.g., 0, 0.1, or 0.2), or preset deviation ranges (e.g., ±0.1°C, ±0.2°C, or ±0.3°C). Preferably, the first preset change amount and the second preset change amount are both 0, which results in higher detection accuracy.

[0077] When the temperature value is less than the temperature threshold, it is possible to detect in real time whether the furnace surface temperature sensor 3 has failed. When the temperature value is greater than the temperature threshold, it is possible to detect whether the furnace surface temperature sensor 3 has failed by reducing the heating power of the stove and monitoring the change in the temperature value within a second preset time period. This can realize the failure detection of the furnace surface temperature sensor 3 under full temperature conditions, thereby improving the accuracy of the failure detection of the furnace surface temperature sensor 3.

[0078] Specifically, after the user turns on the power, the stove starts heating. When the temperature value received by the first temperature monitoring module 4 remains unchanged or the change is within the preset deviation range within the first preset time period, the main control module 1 sends a comparison instruction, and the temperature comparison module 5 compares the temperature value at this time with the temperature threshold (K1) according to the comparison instruction. If the temperature value is less than the temperature threshold (K1), the main control module 1 determines that the stove surface temperature sensor 3 has failed.

[0079] Among them, a temperature threshold can be preset in the main control module 1.

[0080] If the temperature value is greater than the temperature threshold (K1), the main control module 1 can send an adjustment instruction, and the power adjustment module reduces the heating power of the stove according to the adjustment instruction. The main control module 1 also sends a temperature monitoring instruction; the second temperature monitoring module 6 monitors the change of the temperature value within the second preset time period (T3) according to the temperature monitoring instruction. If the temperature value remains unchanged or the change is within the preset deviation range, it means that the furnace surface temperature sensor 3 has failed; if the temperature value changes or the change is not within the preset deviation range, it means that the furnace surface temperature sensor 3 is normal.

[0081] It should be noted that the preset deviation range can be ±a%, or ±b℃

[0082] When furnace surface temperature sensor 3 fails, its resistance range decreases, lowering the maximum detectable temperature. When the actual temperature exceeds the maximum detectable temperature of furnace surface temperature sensor 3, the resistance of furnace surface temperature sensor 3 remains unchanged, causing the temperature value transmitted to the furnace surface temperature sensor detection device to remain at the maximum detectable temperature of furnace surface temperature sensor 3, even though the actual temperature may be significantly higher than this value. Therefore, when the heating power is reduced, the actual temperature of the system decreases. If furnace surface temperature sensor 3 fails, the temperature drop cannot be detected, and the temperature value transmitted to the furnace surface temperature sensor detection device remains at the maximum detectable temperature of furnace surface temperature sensor 3.

[0083] Furthermore, the furnace surface temperature sensor detection device also includes a power acquisition module 8 and a gear judgment module 7 that are interconnected; the power acquisition module 8 is used to connect to the heating device of the stove, and the power acquisition module 8 is used to obtain the heating power value of the stove; the gear judgment module 7 is used to compare the heating power value of the stove with the preset power value; the gear judgment module 7 is connected to the main control module 1.

[0084] When the heating power value of the stove is greater than the preset power value, the gear judgment module 7 can determine that the stove is in the first gear, and the main control module 1 sets the first preset time period to T1; when the heating power value of the stove is less than the preset power value, the gear judgment module 7 can determine that the stove is in the second gear, and the main control module 1 sets the first preset time period to T2; T1<T2.

[0085] Specifically, after the user turns on the stove and starts heating, the power acquisition module 8 receives the stove's heating power value in real time, and the gear position determination module 7 compares the heating power value with a preset power value (P0). If the heating power value is greater than the preset power value, the gear position determination module 7 determines that the stove is in the first gear; if the heating power value is less than the preset power value, the gear position determination module 7 determines that the stove is in the second gear.

[0086] The value of P0 may be the middle value of the heating power of all gears, or the heating gears may be classified (eg, if there are 10 gears in total, gears 1-5 are defined as the first gear, and gears 6-10 are defined as the second gear).

[0087] According to different gears, when the stove is in the first gear, the first preset time period is T1; when the stove is in the second gear, the first preset time period is T2, T1<T2.

[0088] The high-power heating time is short, and the low-power heating time is long. The purpose is to ensure that the stove reaches a stable temperature when heating at low power to prevent false alarms; when heating at high power, failure detection can be performed as soon as possible to prevent untimely alarms.

[0089] Among them, T1 can be 5 minutes to 7 minutes, and T2 can be 10 minutes to 12 minutes.

[0090] Furthermore, when the variation of the temperature value within the first preset time period is less than or equal to the first preset variation and the temperature value is less than the temperature threshold, the furnace surface temperature sensor 3 is in a failure state.

[0091] Furthermore, when the temperature value is greater than the temperature threshold and the change in the temperature value within the second preset time period is less than or equal to the second preset change, the furnace surface temperature sensor 3 is in a failure state.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A furnace surface temperature sensor detection method, characterized in that: The following steps are involved: Obtaining the temperature value detected by the furnace surface temperature sensor (3); When the change in the temperature value within the first preset time period is less than or equal to the first preset change, comparing the temperature value with the temperature threshold; When the temperature value is less than the temperature threshold, it is determined that the furnace surface temperature sensor (3) is invalid; When the temperature value is greater than the temperature threshold, the heating power of the furnace is reduced and the temperature value is monitored within a second preset time period. When the change in the temperature value within the second preset time period is less than or equal to the second preset change, it is determined that the furnace surface temperature sensor (3) has failed, thereby realizing failure detection of the furnace surface temperature sensor (3) under full temperature range conditions; Before the step of monitoring the temperature value within the first preset time period, the method further includes the following steps: Obtain the heating power value of the stove and compare the heating power value with the preset power value; When the heating power value is greater than the preset power value, it is determined that the stove is in the first gear, and the first preset time period is T1; When the heating power value is less than the preset power value, it is determined that the stove is in the second gear, and the first preset time period is T2; T1 <T2。 2. The furnace surface temperature sensor detection method according to claim 1, characterized in that: After determining that the furnace surface temperature sensor (3) has failed, the furnace is controlled to stop heating.

3. The furnace surface temperature sensor detection method according to claim 1, characterized in that: In the step of reducing the heating power of the stove and monitoring the temperature value within a second preset time period, when the change in the temperature value within the second preset time period is greater than the second preset change, it is determined that the stove surface temperature sensor (3) is normal.

4. The furnace surface temperature sensor detection method according to claim 3, characterized in that: When the temperature value is greater than the temperature threshold and the furnace surface temperature sensor (3) is judged to be normal, the heating power of the furnace is increased to the initial heating power.

5. The furnace surface temperature sensor detection method according to claim 1, characterized in that: The T1 is 5 minutes to 7 minutes, and the T2 is 10 minutes to 12 minutes.

6. The furnace surface temperature sensor detection method according to claim 1, characterized in that: When the ambient temperature of the stove is 25° C., the lowest stable temperature that can be reached by the stove using the second gear for heating time T2 is the temperature threshold.

7. The furnace surface temperature sensor detection method according to any one of claims 1 to 6, characterized in that: When reducing the heating power of the stove, the reduction in heating power is 30%-70%.

8. The furnace surface temperature sensor detection method according to any one of claims 1 to 6, characterized in that: The second preset time period is 30 seconds to 60 seconds.

9. The furnace surface temperature sensor detection method according to any one of claims 1 to 6, characterized in that: The first preset change amount and the second preset change amount are both 0.

10. A furnace surface temperature sensor detection device, characterized in that: It includes a temperature acquisition module (2), a first temperature monitoring module (4), a second temperature monitoring module (6), a temperature comparison module (5), a power regulation module and a main control module (1); The temperature acquisition module (2) is used to connect to the furnace surface temperature sensor (3), and the temperature acquisition module (2) is used to acquire the temperature value detected by the furnace surface temperature sensor (3); The first temperature monitoring module (4) and the second temperature monitoring module (6) are respectively connected to the temperature acquisition module (2); the first temperature monitoring module (4) is used to monitor the change of the temperature value within a first preset time period; the second temperature monitoring module (6) is used to monitor the change of the temperature value within a second preset time period; The temperature comparison module (5) is connected to the temperature acquisition module (2), and the temperature comparison module (5) is used to compare the temperature value with the temperature threshold; The power regulating module is used to be connected to the heating device of the stove, and the power regulating module is used to regulate the heating power of the stove; The first temperature monitoring module (4), the second temperature monitoring module (6), the temperature comparison module (5) and the power regulation module are respectively connected to the main control module (1); When the change in the temperature value within the first preset time period is less than or equal to the first preset change, comparing the temperature value with the temperature threshold; When the temperature value is less than the temperature threshold, it is determined that the furnace surface temperature sensor (3) is invalid; When the temperature value is greater than the temperature threshold, the heating power of the furnace is reduced and the temperature value is monitored within a second preset time period. When the change in the temperature value within the second preset time period is less than or equal to the second preset change, it is determined that the furnace surface temperature sensor (3) has failed, thereby realizing failure detection of the furnace surface temperature sensor (3) under full temperature range conditions; The furnace surface temperature sensor detection device further includes a power acquisition module (8) and a gear position determination module (7) connected to each other; The power acquisition module (8) is used to connect to the heating device of the stove, and the power acquisition module (8) is used to obtain the heating power value of the stove; The gear position determination module (7) is used to compare the heating power value of the stove with a preset power value; the gear position determination module (7) is connected to the main control module (1).

11. The furnace surface temperature sensor detection device according to claim 10, characterized in that: When the variation of the temperature value within the first preset time period is less than or equal to the first preset variation and the temperature value is less than the temperature threshold, the furnace surface temperature sensor (3) is in a failure state.

12. The furnace surface temperature sensor detection device according to claim 10, characterized in that: When the temperature value is greater than the temperature threshold and the variation of the temperature value within the second preset time period is less than or equal to the second preset variation, the furnace surface temperature sensor (3) is in a failure state.

Images