An overheat protection method, device and porch heating device

Abstract

The present invention discloses an overheat protection method, device and porch heating device, which relates to the temperature control field. The porch heating device includes a processor, a heater and a temperature control module. After the processor detects that the connection between the heater and the power supply is disconnected, it determines whether the connection is restored after a first preset duration. If it is not restored, the heater is directly locked; if it is restored, the number of overheat fault occurrences is recorded once. When the number of overheat fault occurrences is greater than the preset fault number, the heater is also directly locked. After the heater is locked, it remains in the shutdown state, and the number of overheat fault occurrences is cleared after the heater is locked. By detecting the change in the connection state between the heater and the power supply, the heater is locked when it is detected that the connection is disconnected for a period of time or when there are frequent on-off operations. On the premise of ensuring overheat protection for the porch heating device, frequent on-off operations of the temperature control module are avoided, and further, the service life of the temperature control module and the porch heating device is prevented from being reduced due to frequent on-off operations.

Description

Technical Field

[0001] The present invention relates to the field of temperature control, and particularly to an overheat protection method, device and porch heating device. Background Art

[0002] The porch heating device includes a heater and a blower. After the heater dissipates heat, the hot air is blown from the ventilation opening to the external porch area through the blower to provide heat for the porch area. However, when the heater fails, it will cause the heater to abnormally heat up, thereby causing damage to the porch heating device.

[0003] In order to improve the safety of the porch heating device, the prior art sets a temperature control module in series with the heater in the porch heating device. The temperature control module is at least composed of a controlled switch, a temperature detection unit and a controller. When the temperature control module detects that the internal temperature of the porch heating device is greater than a preset value, it disconnects the connection between the heater and the power supply, so that the heater loses power and stops working, and when it detects that the internal temperature is lower than the preset value, it restores its connection. However, due to the complex actual application environment, the internal temperature will constantly change. If the internal temperature constantly fluctuates near the preset value, it will cause the temperature control module to frequently turn on and off, and further cause the heater to frequently start and stop, reducing the service life of the temperature control module and the porch heating device. Summary of the Invention

[0004] The purpose of the present invention is to provide an overheat protection method, device and porch heating device, which avoid the frequent on-off of the temperature control module on the premise of ensuring overheat protection for the porch heating device, and further avoid reducing the service life of the temperature control module and the porch heating device due to frequent on-off.

[0005] To solve the above technical problems, the present invention provides an overheat protection method, which is applied to a processor in a porch heating device. The porch heating device further includes a heater and a temperature control module. The temperature control module is used to disconnect the connection between the heater and the power supply when it detects that the internal temperature of the porch heating device is greater than a first preset temperature, and restore the connection between the heater and the power supply when the internal temperature is not greater than the first preset temperature. The overheat protection method includes:

[0006] Judge whether the connection between the heater and the power supply is disconnected;

[0007] If the connection is disconnected, increment by 1 the overheat fault count representing the disconnection, and judge whether the overheat fault count is greater than a preset fault count;

[0008] If it is greater than the preset fault count, lock the working state of the heater as the stop state, and clear the overheat fault count;

[0009] If it is not greater than the preset number of faults, then after a first preset duration, it is determined whether the connection between the heater and the power supply is restored;

[0010] If the connection is not restored, the working state of the heater is locked to the stop state, and the overheat fault count is cleared.

[0011] Preferably, after determining whether the connection between the heater and the power supply is restored, it further includes:

[0012] If the connection is restored, the following steps are executed:

[0013] S21: Control the heater to turn on;

[0014] S22: Determine whether the heater is successfully turned on; if it is not successfully turned on, enter S23; if it is successfully turned on, enter S26;

[0015] S23: Increment the fault restart count by 1 and enter S24;

[0016] S24: Determine whether the fault restart count is greater than the preset restart count; if it is greater than the preset restart count, enter S25; if it is not greater than the preset restart count, return to S21;

[0017] S25: Lock the working state of the heater to the stop state and clear the fault restart count;

[0018] S26: Clear the fault restart count and determine that the heater enters the normal working state.

[0019] Preferably, after determining whether the connection between the heater and the power supply is restored, it further includes:

[0020] If the connection is restored, determine whether the connection between the heater and the power supply is disconnected within a second preset duration;

[0021] If it is not disconnected, clear the overheat fault count.

[0022] Preferably, determining whether the connection between the heater and the power supply is restored includes:

[0023] Determine whether the in-position signal of the heater is obtained;

[0024] If the in-position signal of the heater is obtained, it is determined that the connection is restored;

[0025] If the in-position signal of the heater is not obtained, it is determined that the connection is not restored.

[0026] Preferably, while determining whether the connection between the heater and the power supply is disconnected, it further includes:

[0027] Obtaining the outlet temperature of the porch heating device;

[0028] Determining whether the outlet temperature is lower than a second preset temperature;

[0029] If it is lower than the second preset temperature, locking the working state of the heater to the stop state.

[0030] Preferably, when the current moment is within a third preset duration after the porch heating device is powered on, determining whether the outlet temperature is lower than the second preset temperature includes:

[0031] S31: Determining whether the outlet temperature at the current moment is lower than the second preset temperature; if so, entering S32; if not, entering S34;

[0032] S32: Incrementing the number of air outlet faults by 1 and entering S33;

[0033] S33: Determining whether the number of air outlet faults is greater than a preset number of air outlet faults; if so, determining that it is lower than the second preset temperature and clearing the number of air outlet faults; if not, entering S34;

[0034] S34: Taking the time point after the current moment has passed a fourth preset duration as the new current moment and entering S35;

[0035] S35: Determining whether the current moment is within the third preset duration after the porch heating device is powered on; if so, returning to S31; if not, clearing the number of air outlet faults and determining that the heater enters the normal working state;

[0036] Wherein, the fourth preset duration is less than the third preset duration.

[0037] Preferably, when the current moment is outside the third preset duration after the porch heating device is powered on, determining whether the outlet temperature is lower than the second preset temperature includes:

[0038] Determining whether the temperature of the air outlet is continuously lower than the second preset temperature for a fifth preset duration;

[0039] If so, determining that it is lower than the second preset temperature.

[0040] This application also provides an overheat protection device, including:

[0041] A memory for storing a computer program;

[0042] A processor, which is used to implement the steps of the overheat protection method as described above when executing the computer program.

[0043] The present application also provides a porch heating device, including a porch heating device body and the overheat protection device as described above;

[0044] The overheat protection device is connected to the porch heating device body.

[0045] Preferably, it further includes a fuse;

[0046] The fuse is connected in series with the heater in the porch heating device.

[0047] In summary, the present application provides an overheat protection method, device and porch heating device, which relates to the temperature control field. The porch heating device includes a processor, a heater and a temperature control module. The temperature control module is used to disconnect the connection between the heater and the power supply when detecting that the internal temperature of the porch heating device is greater than the first preset temperature, and restore the connection between the heater and the power supply when the internal temperature is not greater than the first preset temperature. After the processor detects that the connection between the heater and the power supply is disconnected, it judges whether the connection is restored after a first preset duration. If not, the heater is directly locked, so that the heater ignores other instructions and always remains in the stopped working state; if it is restored, the number of overheat fault times is recorded once. When the number of overheat fault times is greater than the preset fault times, the heater is also directly locked, and the number of overheat fault times will be cleared after the heater is locked. By detecting the change of the connection state between the heater and the power supply, when it is detected that the connection is continuously disconnected for a period of time and when it is frequently turned on and off, the heater is locked to make it not work. On the premise of ensuring overheat protection for the porch heating device, it avoids the frequent on and off of the temperature control module, and further avoids reducing the service life of the temperature control module and the porch heating device due to frequent on and off. Description of the Drawings

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the prior art and the embodiments. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0049] Figure 1 It is a flowchart of an overheat protection method provided by the present application;

[0050] Figure 2 It is a structural schematic diagram of a porch heating device provided by the present application;

[0051] Figure 3 It is a schematic diagram of overheat fault times detection provided by the present application;

[0052] Figure 4 Another schematic diagram for detecting the number of overheat faults provided for this application;

[0053] Figure 5 A schematic diagram for clearing the number of overheat faults provided for this application;

[0054] Figure 6 A schematic diagram for detecting the number of fan faults provided for this application;

[0055] Figure 7 Another schematic diagram for detecting the number of fan faults provided for this application;

[0056] Figure 8 A schematic diagram of the structure of an overheat protection device provided for this application;

[0057] Figure 9 Another schematic diagram of the structure of a porch heating device provided for this application. Detailed implementation manners

[0058] The core of the present invention is to provide an overheat protection method, device and porch heating device, which can avoid the frequent on-off of the temperature control module on the premise of ensuring the overheat protection of the porch heating device, and further avoid reducing the service life of the temperature control module and the porch heating device due to frequent on-off.

[0059] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0060] A porch heating device is a device for heating the porch on a train. The porch heating device is usually arranged in a cabinet on the side of the porch, and its heating principle is similar to that of a heater generally understood. The porch heating device includes a heater and a fan. The heater generates heat by itself to raise the temperature of the surrounding air, and then the fan blows the surrounding hot air into the porch, so as to achieve the purpose of heating the porch.

[0061] In the prior art, in order to protect a porch heating device, a temperature control module is usually provided. The temperature control module at least includes a switch connecting the heater and the power supply, a temperature detection unit, and a control unit for controlling the switch. When the control unit detects through the temperature detection unit that the temperature inside the porch heating device is too high, the control switch is disconnected to cut off the power supply of the heater to avoid accidents. However, the logic of the temperature control module is relatively simple. It only judges whether the actual temperature is greater than a preset temperature threshold. When it is greater, the control switch is disconnected; when it is not greater, the control switch is closed. It can be understood that if the internal temperature of the porch heating device fluctuates repeatedly near the temperature threshold, the switch will continuously disconnect and close. Such frequent on-off not only reduces the lifespan of the switch itself but also affects the service life of the heater.

[0062] Please refer to Figure 1 , Figure 1 which is a flowchart of an overheat protection method provided by this application and is applied to a processor in a porch heating device. The porch heating device further includes a heater and a temperature control module. The temperature control module is used to disconnect the connection between the heater and the power supply when it detects that the internal temperature of the porch heating device is greater than a first preset temperature, and restore the connection between the heater and the power supply when the internal temperature is not greater than the first preset temperature. The overheat protection method includes:

[0063] S1: Judge whether the connection between the heater and the power supply is disconnected;

[0064] S2: If the connection is disconnected, increment by 1 the overheat fault count indicating the disconnection, and judge whether the overheat fault count is greater than a preset fault count;

[0065] S3: If it is greater than the preset fault count, lock the working state of the heater as the stop state, and clear the overheat fault count;

[0066] S4: If it is not greater than the preset fault count, judge whether the connection between the heater and the power supply is restored after a first preset duration;

[0067] S5: If the connection is not restored, lock the working state of the heater as the stop state, and clear the overheat fault count.

[0068] To solve the above technical problems, in this application, considering that the temperature control module will disconnect the internal switch when it detects that the internal temperature of the porch heating device is too high, subsequent overheat protection measures can be implemented by detecting whether the switch is disconnected.

[0069] Specifically, the processor will continuously determine whether the connection between the heater and the power supply is disconnected, that is, the processor will continuously detect whether the switch of the temperature control unit is disconnected. For the specific determination method, it can be to determine whether the in-place signal from the heater is detected. When the in-place signal is suddenly not received, it indicates that the switch of the temperature control module is disconnected; it can also be to determine whether the signal sent by the temperature control module is received. When the signal indicating disconnection is received, it indicates that the switch of the temperature control module is disconnected. When the signal indicating reconnection is received, it indicates that the switch of the temperature control module is closed again after being disconnected. This application does not limit the specific method of determining whether the switch is disconnected.

[0070] When the switch is disconnected, it indicates that the internal temperature of the porch heating device is too high at this time. However, since the processor does not know how high the actual internal temperature in the porch heating device is, the method of determining whether the internal temperature is within the tolerable range can be based on whether the temperature can quickly return to normal. When the temperature of the heater is too high and causes the switch of the temperature control module to be disconnected, if the internal temperature does not exceed the temperature threshold by too much, the internal temperature can be reduced back to the normal temperature by the exhaust of the fan within a certain period of time. When the temperature control module detects that the internal temperature drops below the temperature threshold again, it will restore the connection between the heater and the power supply, that is, close its own switch to make the heater work again. The first preset duration is pre-set according to parameters related to heat dissipation such as the overall size of the porch heating device actually put into use, the air exhaust volume per unit time of the fan, and the air pressure of the fan.

[0071] After the switch of the temperature control module is disconnected and the first preset duration has passed, the switch of the temperature control module still has not been re-closed. This may indicate various situations. One is that the previous temperature of the heater was too high and the internal temperature could not be reduced below the temperature threshold within the first preset duration; one is that the fan of the porch heating device is damaged and cannot exhaust the hot air inside the porch heating device; another is that the temperature control module itself is damaged. No matter which of the above situations occurs, it indicates that there is a component failure or damage in the porch heating device. If the heater is restarted in this situation where there is a component failure or damage, it is very likely to cause permanent damage to the components in the porch heating device or even cause a fire. Therefore, when the switch of the temperature control module is disconnected and has not been re-closed after the first preset duration, the processor will place the heater in a locked stop state. In the locked stop state, unless the staff comes for manual intervention, the heater will remain in the stopped working state no matter what form of control signal it receives and will not start to avoid accidents.

[0072] In this application, considering that when the internal temperature of the porch heating device fluctuates repeatedly near the temperature threshold, the switch will continuously disconnect and close, thus affecting the service life of the switch and the heater. Therefore, a parameter of the overheat fault count is set, and the overheat fault count defaults to 0. In the actual application scenario, when the internal temperature of the porch heating device is too high, the switch in the temperature control module disconnects, and then the internal temperature drops back to the normal level through natural heat dissipation, and the switch of the temperature control module closes again. Since it can successfully cool down within the first preset duration, it indicates that although the internal temperature of the porch heating device is too high, it is not much higher than the temperature threshold. In this case, the phenomenon of the internal temperature fluctuating repeatedly near the temperature threshold may occur. Therefore, each time the switch of the temperature control module disconnects once, the overheat fault count is incremented by 1.

[0073] It can be understood that since the frequent disconnection and closing of the switch will affect the service life of the switch and the heater, a preset fault count can be set in advance according to the tolerable range of the switch and the heater. When the switch disconnects and closes frequently, the overheat fault count will also increase continuously. When the overheat fault count is greater than the preset fault count, it indicates that the switch of the temperature control module has the phenomenon of frequent on-off. At this time, to ensure its service life, the heater will also be directly placed in the locked stop state. At the same time, the overheat fault count will be cleared to zero to detect the overheat fault count in the next round after the porch heating device returns to normal.

[0074] Please refer to Figure 3 , Figure 3 , which is a schematic diagram of the detection of the overheat fault count provided by this application. The first preset duration is 10 minutes. Whether the switch disconnects is judged by detecting whether the in-place signal of the heater is obtained. When it is detected that the in-place signal of the heater suddenly disappears, the overheat fault count is recorded once. After 10 minutes, that is, after the first preset duration, the in-place signal is still there, so the overheat fault count will be recorded once. And in Figure 3 , the heater just restarts at the moment of 10 minutes after the previous sudden stop of work, and the heater disconnects within 10 seconds after restarting, indicating that the internal temperature of the porch heating device overheats rapidly within 10 seconds after the heater restarts. This is usually because the internal temperature has not had time to dissipate heat or there is a short circuit or other abnormalities in the heater. Since the in-place signal is lost again after 10 seconds, the overheat fault count is recorded once again until it is greater than the preset fault count of 2 times, then the heater is locked. Please refer to Figure 4 , Figure 4 , which is a schematic diagram of locking the heater provided by this application. When it is detected that the in-place signal of the heater suddenly disappears, the overheat fault count is recorded once. After 10 minutes, that is, after the first preset duration, the in-place signal of the heater is still not detected, so the heater is directly locked at this time.

[0075] It can be seen that after the switch of the temperature control module is disconnected, its top - priority step is to determine whether the switch closes within the first preset duration. If it does not close all the time, the heater will be directly locked; for all the "disconnect - then - reconnect" steps described in this application, they are all based on the situation where the switch closes within the first preset duration.

[0076] It should be noted that in addition to being set between the heater and the power supply, the temperature control module can also be set between the blower and the processor. This is because the blower is less likely to malfunction compared to the heater and can serve as a better detection unit. When the temperature control module is disconnected, the processor learns that the porch heating device is overheated based on the loss of the signal from the blower. The processor disconnects the control of the heater, and the heater will also stop working after losing the control signal from the processor. Therefore, the temperature control module can also be set here. Please refer to Figure 2 , Figure 2 is a schematic structural diagram of a porch heating device provided by this application. In the figure, the positions of the heater and the blower in the actual scenario are on the same vertical axis. For the convenience of observation, they are laid out as a circuit diagram. An internal protection switch is usually set in the blower, that is, the switch between port 1 and port 2 of the blower in the figure. Its working principle is the same as that of the temperature control module, and the real temperature control module can also be set between the blower and the processor, equivalent to connecting two temperature control modules in series to achieve the purpose of double protection. It can be seen that the heater can only be controlled to start by the processor after the processor receives the working signal or the in - position signal from the blower, that is, the temperature control module and the internal protection switch of the blower must both be in the conducting state to start.

[0077] In summary, after the processor detects that the connection between the heater and the power supply is disconnected, it determines whether the connection is restored after the first preset duration. If it is not restored, the heater is directly locked, making the heater ignore other instructions and always remain in the stopped working state; if it is restored, the number of overheat fault times is recorded. When the number of overheat fault times is greater than the preset fault times, the heater is also directly locked, and the number of overheat fault times will be cleared after the heater is locked. By detecting the change in the connection state between the heater and the power supply, when it is detected that the connection is continuously disconnected for a period of time and when it is frequently switched on and off, the heater is locked to make it not work. On the premise of ensuring overheat protection for the porch heating device, it avoids the frequent on - off of the temperature control module, and further avoids reducing the service life of the temperature control module and the porch heating device due to frequent on - off.

[0078] Based on the above - mentioned embodiment:

[0079] As a preferred embodiment, after determining whether the connection between the heater and the power supply is restored, it further includes:

[0080] If the connection is restored, the following steps are executed:

[0081] S21: Control the heater to turn on.

[0082] S22: Determine whether the heater is successfully turned on. If it is not successfully turned on, go to S23; if it is successfully turned on, go to S26.

[0083] S23: Increment the fault restart count by 1 and go to S24.

[0084] S24: Determine whether the fault restart count is greater than the preset restart count. If it is greater than the preset restart count, go to S25; if it is not greater than the preset restart count, return to S21.

[0085] S25: Lock the working state of the heater to the stop state and clear the fault restart count.

[0086] S26: Clear the fault restart count and determine that the heater enters the normal working state.

[0087] In order to accurately determine whether the heater is faulty, in this application, after the switch of the temperature control module is re-closed, the processor can be used to control the heater to restart, rather than the heater restarting automatically or being controlled by other control units to restart the heater, so that the processor can accurately determine whether the heater is successfully turned on. Specifically, after the processor sends a turn-on signal to the heater, it is determined whether the working signal of the heater is detected within a certain period of time. If the working signal is obtained, it means that the heater is successfully turned on. When the processor controls the heater to turn on, if the heater fails to turn on normally, the fault restart count is incremented by one, and the processor tries to control the heater to turn on again. If the processor fails to control the heater to turn on multiple times, that is, the fault restart count is greater than the preset restart count, it can be determined that there is a certain fault in the heater that causes the heater to fail to turn on. At this time, the heater is not controlled to restart, but is directly placed in the locked stop state to prevent the heater from starting abnormally; if the processor only tries a few times or even 1 time and successfully turns on the heater, that is, the heater is successfully restarted before the fault restart count is less than the preset restart count, it means that there is no fault in the heater that causes the heater to fail to turn on. At this time, the subsequent steps can be entered and the fault restart count can be cleared.

[0088] Furthermore, the number of fault restarts can share the same count as the number of overheat faults. When the temperature control module disconnects and then reconnects, when the processor controls the heater to restart, it determines the number of fault restarts based on the previous number of overheat faults, and the subsequent number of overheat faults can also be based on the number of fault restarts before clearing. For example, if the recorded number of overheat faults at this time is 1, the initial value of the number of fault restarts is 1 instead of 0. If the heater fails to restart once during the restart process, the number of fault restarts is recorded as 2 and applied to the number of overheat faults, that is, the subsequent step of determining whether the number of overheat faults is greater than the preset number of faults is based on 2. It can be understood that the number of overheat faults and the number of fault restarts can be regarded as the same parameter.

[0089] In summary, by detecting whether the heater restarts successfully, it is possible to accurately determine whether the heater is faulty.

[0090] As a preferred embodiment, after determining whether the connection between the heater and the power supply is restored, it further includes:

[0091] If the connection is restored, determine whether the connection between the heater and the power supply is disconnected within a second preset duration;

[0092] If it is not disconnected, clear the number of overheat faults.

[0093] In order to accurately record the number of overheat faults, in this application, when the switch of the temperature control module disconnects and then reconnects, if the heater can operate normally in a subsequent period of time, that is, the switch of the temperature control module does not disconnect again in a subsequent period of time, it means that the heater can operate stably and ensure that the internal temperature of the porch heating device will not be too high. At this time, the number of overheat faults can be cleared so that the heater can start counting again when a fault occurs next time; please refer to Figure 5 , Figure 5 which is a schematic diagram of clearing the number of overheat faults provided by this application. Figure 5 In this application, the second preset duration is set to be the same as the first preset duration. Based on this, the number of overheat faults can be accurately recorded, and the previous recorded times can be prevented from affecting the subsequent recording process.

[0094] As a preferred embodiment, determining whether the connection between the heater and the power supply is restored includes:

[0095] Determine whether the in-position signal of the heater is obtained;

[0096] If the in-position signal of the heater is obtained, it is determined that the connection is restored;

[0097] If the in-position signal of the heater is not obtained, it is determined that the connection is not restored.

[0098] In order to simply determine whether the connection is restored, in this application, the connection can be determined by detecting the in-position signal of the heater. Specifically, when the heater is powered on, regardless of whether it is in the heating working state or the standby state, etc., it will generate a signal indicating its own in-position. It can be seen that as long as the in-position signal of the heater can be obtained, it can be explained that the heater is powered on, and further it can be explained that the connection between the heater and the power supply has been restored. Based on this, by detecting the in-position signal, it is possible to simply determine whether the connection is restored.

[0099] As a preferred embodiment, while determining whether the connection between the heater and the power supply is disconnected, it further includes:

[0100] Obtain the outlet temperature of the porch heating device;

[0101] Judge whether the outlet temperature is lower than the second preset temperature;

[0102] If it is greater than the second preset temperature, lock the working state of the heater as the stop state.

[0103] In order to better protect the porch heating device, in this application, considering that the porch heating device belongs to a heating device, when the fan of the porch heating device fails, the hot air in the porch heating device cannot be discharged, resulting in an abnormal rise in the internal temperature of the porch heating device, which may cause damage or even fire of some other flammable components. Based on this, a second layer of protection measures is set. Specifically, the processor also needs to detect the temperature at the outlet of the porch heating device. The outlet refers to the outlet where the fan blows the hot air from the heater to the porch environment. Since hot air passes through, the temperature at the outlet is relatively high under normal circumstances. Therefore, a second preset temperature can be set, and the second preset temperature is set according to the outlet temperature of the porch heating device under normal circumstances. When it is detected that the temperature at the outlet is lower than the second preset temperature, it indicates that there may be a situation where the fan fails to rotate and the hot air cannot be discharged. At this time, the heater is locked to avoid the occurrence of faults. Based on this, the porch heating device can be better protected.

[0104] Regarding how to detect the outlet temperature, an additional temperature control module can be set to connect the fan to the power supply or connect the fan to the control unit for controlling the fan, or a temperature sensor can be set at the outlet. This application does not make any limitations in this regard.

[0105] As a preferred embodiment, when the current moment is within the third preset duration after the porch heating device is powered on, judging whether the outlet temperature is lower than the second preset temperature includes:

[0106] S31: Judge whether the outlet temperature at the current moment is lower than the second preset temperature; if so, enter S32; if not, enter S34;

[0107] S32: Increment the number of air outlet failure times by 1, and proceed to S33;

[0108] S33: Determine whether the number of air outlet failure times is greater than the preset number of air outlet failure times; if so, determine that the temperature is lower than the second preset temperature, and clear the number of air outlet failure times; if not, proceed to S34;

[0109] S34: Take the time point after the fourth preset duration from the current moment as the new current moment, and proceed to S35;

[0110] S35: Determine whether the current moment is within the third preset duration after the porch heating device is powered on; if so, return to S31; if not, clear the number of air outlet failure times, and determine that the heater enters the normal working state;

[0111] Wherein, the fourth preset duration is less than the third preset duration.

[0112] To accurately determine whether the fan is faulty, in this application, considering that the heater needs a certain amount of time to heat, and it cannot significantly increase the temperature inside the porch heating device instantaneously, that is, the heater needs to preheat. It can be seen that when the porch heating device is just started, the internal temperature of the porch heating device will be lower than the second preset temperature for a period of time, and it needs to be heated for a period of time to be higher than the second preset temperature. During this period, the temperature detected at the air outlet will necessarily be lower than the second preset temperature. If the heater is locked in the stopped state at this time, it will cause the porch heating device to stop operating due to non-fault. Therefore, a third preset duration is set, which is determined according to the time usually required for the heater to preheat, the heat generation per unit time of the heater, and the size of the porch heating device. During the third preset duration after the porch heating device is powered on, when the temperature at the air outlet is detected to be lower than the second preset temperature, the heater will not be directly locked, but the number of air outlet failure times will be recorded once, and the temperature at the air outlet will be detected again after a period of time (that is, after the fourth preset duration) until the time after the porch heating device is powered on exceeds the third preset duration. If the heater and the fan are normal, the temperature at the air outlet will usually rise above the second preset temperature after a period of time. Even if there are problems such as low voltage or low power resulting in slow heating of the heater, but ultimately the internal temperature of the porch heating device will usually rise above the second preset temperature; if the fan is faulty, the detected temperature at the air outlet will be lower than the second preset temperature, that is, the recorded number of air outlet failure times will be more than that in the normal situation, so the heater needs to be locked; if the detected temperature at the air outlet is already higher than the second preset temperature, but in subsequent detections, the temperature at the air outlet is detected to be lower than the second preset temperature again, it may indicate that the fan has suddenly experienced a short-term failure and stopped rotating, so the number of air outlet failure times also needs to be recorded once. Please refer to Figure 6 , Figure 6A schematic diagram for detecting the number of fan failures provided by this application. The third preset duration can be set to 60 minutes, and the fourth preset duration is set to 10 minutes. Generally speaking, the heater can reach the normal heating temperature after heating for 10 minutes, but in Figure 6 After 30 minutes, the fan is still at a low level, and all three consecutive detections are at a low level, indicating that the internal temperature of the porch heating device continues to be lower than the second preset temperature. Therefore, the heater can be locked. Based on this, it is possible to accurately determine whether the fan is faulty.

[0113] As a preferred embodiment, when the current moment is outside the third preset duration after the porch heating device is powered on, determining whether the outlet temperature is lower than the second preset temperature includes:

[0114] Determining whether the temperature at the outlet is lower than the second preset temperature for a continuous fifth preset duration;

[0115] If so, it is determined that the temperature is lower than the second preset temperature.

[0116] To accurately determine whether the fan is faulty, in this application, considering that after the heater in the porch heating device has been started for a period of time, that is, after the third preset duration, the heater has been preheated and can normally generate heat. When both the heater and the fan are in normal conditions, the internal temperature and the outlet temperature of the porch heating device will remain within a stable temperature range to provide a stable heating function for the porch. Based on this, if it is suddenly detected that the outlet temperature is lower than the second preset temperature at this time, considering that temperature is a continuous variable, it is impossible to suddenly drop below the second preset temperature under normal circumstances. Therefore, it can be determined that something has happened at the outlet at this time. Considering that among these situations that occur, there may be some short-term sudden situations that cause the outlet temperature to decrease rather than the fan itself malfunctioning and stopping to cause the outlet temperature to decrease, such as a large amount of cold air from the outside suddenly passing through the outlet. Therefore, a relatively short fifth preset duration also needs to be set. This fifth preset duration is determined based on the possible influence time of these short-term sudden situations. If the outlet air temperature is still lower than the second preset temperature after the fifth preset duration, the decrease in the outlet temperature caused by short-term sudden situations can be excluded, and it can be determined that the decrease in the outlet temperature is caused by the fan itself malfunctioning and stopping. Therefore, when the outlet air temperature is still lower than the second preset temperature after the fifth preset duration, it is determined that the temperature is lower than the second preset temperature for subsequent locking of the heater. Please refer to Figure 7 , Figure 7 Another schematic diagram for detecting the number of fan failures provided by this application. Based on this, it is possible to accurately determine whether the fan is faulty.

[0117] Please refer to Figure 8 , Figure 8The structural schematic diagram of an overheat protection device provided for this application includes:

[0118] A memory 21 for storing computer programs;

[0119] A processor 22 for implementing the steps of the overheat protection method as described above when executing the computer program.

[0120] For a detailed introduction to an overheat protection device provided for this application, please refer to the embodiments of the above overheat protection method, and this application will not elaborate herein.

[0121] Please refer to Figure 9 , Figure 9 The structural schematic diagram of another porch heating device provided for this application includes a porch heating device body 31 and also includes the above overheat protection device 32;

[0122] The overheat protection device 32 is connected to the porch heating device body 31.

[0123] For a detailed introduction to a porch heating device provided for this application, please refer to the embodiments of the above overheat protection method, and this application will not elaborate herein.

[0124] Based on the above embodiments:

[0125] As a preferred embodiment, it further includes a fuse;

[0126] The fuse is connected in series with the heater in the porch heating device body 31.

[0127] To better protect the porch heater device body 31, in this application, considering that the temperature control module in the porch heating device body 31 itself may malfunction, when the temperature control module malfunctions, a series of problems may occur, such as the internal temperature of the porch heating device body 31 cannot be detected, the control unit in the temperature control module for controlling the on / off of the switch is damaged, the switch is stuck, etc. These phenomena will cause the temperature control module to not disconnect when the internal temperature of the porch heating device body 31 is too high, resulting in abnormal heating of the heater. Based on this, a fuse is set in series with the heater. The fusing temperature of the fuse is higher than the temperature threshold set by the temperature control module. Using the fuse as a backup protection measure can better protect the porch heater device body 31.

[0128] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description in the method part.

[0129] It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

Claims

1. An overheat protection method, characterized in that, A processor applied to a porch heating device, the porch heating device further comprising a heater and a temperature control module, the temperature control module being configured to disconnect the connection between the heater and the power supply when detecting that the internal temperature of the porch heating device is greater than a first preset temperature, and to restore the connection between the heater and the power supply when the internal temperature is not greater than the first preset temperature. The overheat protection method comprises: Determine whether the connection between the heater and the power supply is disconnected; If the connection is disconnected, increment the overheat fault count representing the disconnection by 1, and determine whether the overheat fault count is greater than a preset fault count; If it is greater than the preset fault count, lock the operating state of the heater as the stop state and clear the overheat fault count; If it is not greater than the preset fault count, determine whether the connection between the heater and the power supply is restored after a first preset duration; If the connection is not restored, lock the operating state of the heater as the stop state and clear the overheat fault count; While determining whether the connection between the heater and the power supply is disconnected, it further includes: obtaining the outlet temperature of the porch heating device; determining whether the outlet temperature is lower than a second preset temperature; if it is lower, lock the operating state of the heater as the stop state; When the current time is within a third preset duration after the porch heating device is powered on, determining whether the outlet temperature is lower than the second preset temperature includes: S31: Determine whether the outlet temperature at the current time is lower than the second preset temperature; if so, go to S32; if not, go to S34; S32: Increment the air outlet fault count by 1 and go to S33; S33: Determine whether the air outlet fault count is greater than a preset air outlet fault count; if so, determine that it is lower than the second preset temperature and clear the air outlet fault count; if not, go to S34; S34: Use the time point after a fourth preset duration from the current time as the new current time and go to S35; S35: Determine whether the current time is within the third preset duration after the porch heating device is powered on; if so, return to S31; if not, clear the air outlet fault count and determine that the heater enters the normal operating state; the fourth preset duration is less than the third preset duration.

2. The overheat protection method according to claim 1, characterized in that, After determining whether the connection between the heater and the power supply is restored, it further includes: If the connection is restored, perform the following steps: S21: Control the heater to turn on; S22: Determine whether the heater is successfully turned on; if not, go to S23; if successfully turned on, go to S26; S23: Increment the fault restart count by 1 and go to S24; S24: Determine whether the fault restart count is greater than a preset restart count; if it is greater than the preset restart count, go to S25; if it is not greater than the preset restart count, return to S21; S25: Lock the operating state of the heater as the stop state and clear the fault restart count; S26: Clear the fault restart count and determine that the heater enters the normal operating state.

3. The overheat protection method according to claim 1, characterized in that, After determining whether the connection between the heater and the power supply is restored, it further includes: If the connection is restored, determine whether the connection between the heater and the power supply is disconnected within a second preset duration; If it is not disconnected, clear the overheat fault count.

4. The overheat protection method according to claim 1, characterized in that Determining whether the connection between the heater and the power supply is restored includes: Determine whether an in-place signal of the heater is obtained; If the in-place signal of the heater is obtained, determine that the connection is restored; If the in-place signal of the heater is not obtained, determine that the connection is not restored.

5. The overheat protection method according to any one of claims 1 to 4, characterized in that, When the current time is outside a third preset duration after the porch heating device is powered on, determining whether the air outlet temperature is lower than a second preset temperature includes: Determine whether the temperature of the air outlet is continuously lower than the second preset temperature for a fifth preset duration; If so, determine that it is lower than the second preset temperature.

6. An overheat protection device, characterized in that, It includes: A memory for storing a computer program; A processor for implementing the steps of the overheat protection method according to any one of claims 1 to 5 when executing the computer program.

7. A porch heating device, characterized in that, It includes a porch heating device body and further includes the overheat protection device according to claim 6; The overheat protection device is connected to the porch heating device body.

8. The porch heating device according to claim 7, wherein, It further includes a fuse; The fuse is connected in series with the heater in the porch heating device.

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