Electric heating device and control method therefor

Abstract

The present application discloses an electric heating device and a control method therefor. The control method comprises: evaluating the state of a medium on the basis of the operating state of an electric heating device itself, so as to determine whether overheat protection is required for the electric heating device. The control method does not require collection of any operating parameter related to the medium. Accordingly, a new control strategy for overheat protection of an electric heating device is provided.

Description

Electric heating device and control method thereof TECHNICAL FIELD

[0001] The present application relates to the field of electric heating, and more particularly, to an electric heating device for heating fluid and a control method of the electric heating device. BACKGROUND

[0002] Electric heating devices are important equipment in the industrial field. For example, in electric vehicles (such as hybrid vehicles or pure electric vehicles), an electric heating device is usually provided to achieve temperature control of the vehicle environment. In operation, a low-temperature medium with a relatively low temperature flows into the electric heating device, and after absorbing the heat of the heating resistor in the electric heating device, the low-temperature medium becomes a high-temperature medium with a relatively high temperature and flows out of the electric heating device.

[0003] If the temperature is too high due to problems such as medium flow (such as whether the medium flows, the flow rate of the medium, whether there are air bubbles in the medium, the viscosity of the medium, etc.), the electric heating device will be over-heat protected (such as locked) considering safety factors. Generally, this over-heat protection strategy is very strict, which can cause the heater to fail to start normally or to perform heating work normally.

[0004] To solve this problem, a conventional idea is to add a medium flow state sensing device, such as a medium flow sensor or a medium pressure pump, in the system to provide medium flow information to the controller for over-heat protection decision. However, this conventional method requires the arrangement of related sensors, and makes the control strategy of the electric heating device more complex, and the probability of control defects is higher.

[0005] Therefore, how to provide a new control strategy for over-heat protection of an electric heating device has become a technical problem to be solved in the field. SUMMARY

[0006] In view of this, the present application provides an electric heating device for heating fluid and a control method of the electric heating device to provide a new control strategy for over-heat protection of the electric heating device.

[0007] In a first aspect, the embodiments of the present application provide a control method of an electric heating device, which comprises: evaluating a medium state according to an operating state of the electric heating device itself to determine whether over-heat protection of the electric heating device is needed, wherein the control method does not need to collect any operating parameter of the medium.

[0008] Optionally, the control method comprises a control method of the electric heating device in a starting stage.

[0009] Optionally, the control method comprises: obtaining standard operation state information of the electric heating device when the medium is in the normal working state; comparing the current operation state information of the electric heating device with the standard operation state information to determine whether the overheat protection of the electric heating device is needed.

[0010] Optionally, if the current operation state information of the electric heating device is consistent with the standard operation state information, the overheat protection of the electric heating device is not needed, otherwise, the overheat protection of the electric heating device is needed; or if the current operation state information of the electric heating device is within the allowable range of the standard operation state information, the overheat protection of the electric heating device is not needed, otherwise, the overheat protection of the electric heating device is needed.

[0011] Optionally, the control method comprises: obtaining a standard temperature or temperature range of the heating element of the electric heating device when the medium is in the normal working state; comparing the current temperature of the heating element of the electric heating device with the standard temperature or temperature range to determine whether the overheat protection of the electric heating device is needed.

[0012] Optionally, the control method comprises: obtaining a temperature change standard interval or temperature rise rate change standard interval of the heating element of the electric heating device corresponding to a first predetermined time when the medium is in the normal working state; comparing the current temperature change difference of the heating element of the electric heating device corresponding to the first predetermined time with the temperature change standard interval or comparing the current temperature rise rate change difference of the heating element of the electric heating device corresponding to the first predetermined time with the temperature rise rate change standard interval to determine whether the overheat protection of the electric heating device is needed.

[0013] Optionally, the control method comprises: making the electric heating device work continuously for a second predetermined time at a predetermined power when the medium is in the normal working state to obtain the temperature change standard interval or the temperature rise rate change standard interval of the heating element of the electric heating device; and / or making the electric heating device work continuously for a second predetermined time at a predetermined power to obtain the current temperature change difference or the current temperature rise rate change difference of the heating element of the electric heating device, wherein the ratio of the predetermined power to the maximum power of the electric heating device is 0.1 to 1, preferably 0.2 to 0.8, more preferably 0.3 to 0.6, most preferably 0.3 to 0.5; wherein the second predetermined time is 1-120 seconds, preferably 1-60 seconds, more preferably 2-30 seconds, more preferably 2-10 seconds.

[0014] Optionally, the starting point of the continuous work for the second predetermined time is when the electric heating device is started.

[0015] Optionally, the obtaining of the standard operation state information of the electric heating device when the medium is in the normal working state is obtained by means of large-scale data analysis of the operation of the electric heating device, preferably by analyzing the large-scale data using machine learning.

[0016] Optionally, the control method comprises that the overheat protection of the electric heating device does not result in locking of the electric heating device.

[0017] Optionally, when the overheat protection of the electric heating device occurs, the current operation power is recorded and a low operation power less than the current operation power is set, the electric heating device is operated at the low operation power for a third predetermined time, if the overheat protection of the electric heating device occurs again during the third predetermined time, the low operation power is re-set until the overheat protection does not occur when the electric heating device is operated at the low operation power for the third predetermined time.

[0018] Optionally, the low operation power is 50% to 90% of the current operation power, preferably 60% to 80%.

[0019] Optionally, the third predetermined time is 10-60 seconds, preferably 15 to 30 seconds, and more preferably 20 seconds.

[0020] Optionally, if the overheat protection of the electric heating device does not occur when the electric heating device is operated at the low operation power for the third predetermined time, the operation power is gradually increased to a predetermined power threshold, if the overheat protection of the electric heating device occurs during the gradual increase of the operation power to the predetermined power threshold, the low operation power is re-set until the overheat protection does not occur when the operation power reaches the predetermined power threshold.

[0021] Optionally, the gradual increase of the operation power to the predetermined power threshold is performed by gradually increasing a predetermined power increase value.

[0022] Optionally, the predetermined power threshold is 50% to 90% of the maximum power of the electric heating device, preferably 60% to 80%.

[0023] Optionally, if the operation power of the electric heating device reaches the predetermined power threshold, the overheat protection fault state is cleared and the electric heating device is allowed to operate at the maximum power.

[0024] In a second aspect, the embodiments of the present application further provide an electric heating device provided with a control device for executing the above-mentioned control method.

[0025] According to the technical solution of the present application, the medium state is evaluated according to the running state of the electric heating device, so as to determine whether the overheat protection of the electric heating device is needed, and any running parameter of the medium is not needed to be collected, thus a new control strategy of the overheat protection of the electric heating device is provided. In addition, in the technical solution of the present application, the medium state is evaluated according to the running state of the electric heating device, and a sensor for sensing the flow information of the medium is not needed to be set, so as to reduce the cost, simplify the circuit and the control strategy of the electric heating device, and reduce the probability of control defects. Meanwhile, the medium state is evaluated according to the running state of the electric heating device, so as to determine whether the overheat protection of the electric heating device is needed, which can more directly determine whether the overheat protection is needed, and can more effectively protect the electric heating device. In addition, the working current of the driving device of the medium is not needed to be detected, the flow information of the medium is not needed to be determined according to the power of the driving device, and the communication with the driving device is not needed to be established, so as to simplify the circuit and the control strategy of the electric heating device, and reduce the probability of control defects.

[0026] Other features and advantages of the present application will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the application and are incorporated herein in their entirety. The drawings that are referred to in the description of the present application are shown by way of illustration in the following items:

[0028] Fig. 1 is a flow chart of a control method of an electric heating device according to a preferred embodiment of the present application. DETAILED DESCRIPTION

[0029] The technical solution of the present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] In a first aspect, the embodiments of the present application provide a control method of an electric heating device. The control method includes the following contents. The medium state is evaluated according to the running state of the electric heating device, so as to determine whether the overheat protection of the electric heating device is needed, and any running parameter of the medium is not needed to be collected.

[0031] Optionally, in the embodiments of the present application, the control method includes a control method of the electric heating device in a starting stage.

[0032] Optionally, in the embodiments of the present application, the running state information of the electric heating device can be used to evaluate the medium state, so as to determine whether the overheat protection of the electric heating device is needed.

[0033] Optionally, in the embodiments of the present application, the standard running state information can be set to evaluate the medium state.

[0034] Specifically, the control method can include the following. Obtain standard operation state information of the electric heating device when the medium is in a normal working state, compare current operation state information of the electric heating device with the standard operation state information to determine whether the electric heating device needs to be protected from overheating.

[0035] Optionally, in the embodiments of the present application, the current operation state information can be compared with the standard operation state information directly, or the current operation state information can be compared with a range determined based on the standard operation state information.

[0036] Optionally, in the embodiments of the present application, if the current operation state information of the electric heating device conforms to the standard operation state information, the electric heating device does not need to be protected from overheating, otherwise, the electric heating device needs to be protected from overheating.

[0037] Alternatively, if the current operation state information of the electric heating device is within an allowable range of the standard operation state information, the electric heating device does not need to be protected from overheating, otherwise, the electric heating device needs to be protected from overheating. The allowable range of the standard operation state information is a range set based on the standard operation state information and a preset error. The preset error can be determined according to specific conditions.

[0038] Optionally, in the embodiments of the present application, the operation state information of the electric heating device can be temperature, power, etc.

[0039] Optionally, in the embodiments of the present application, the operation state information of the electric heating device can be the temperature of the heating element of the electric heating device, or can be the temperature change difference of the heating element in a certain time interval, or can be the change difference of the temperature rise rate of the heating element in a certain time interval. In the embodiments of the present application, the temperature related information of the heating element can accurately reflect the operation state information of the electric heating device, and the way of detecting the temperature of the heating element is relatively simple. Using the temperature related information of the heating element of the electric heating device to represent the operation state information of the electric heating device can be relatively simple and direct to obtain the operation state information of the electric heating device.

[0040] Optionally, in the embodiments of the present application, the temperature of the heating element can be detected by setting a temperature sensor.

[0041] Optionally, in the embodiments of the present application, the control method can include the following. Obtain standard temperature or temperature range of the heating element of the electric heating device when the medium is in a normal working state, compare the current temperature of the heating element of the electric heating device with the standard temperature or temperature range to determine whether the electric heating device needs to be protected from overheating.

[0042] Optionally, it is judged whether the overheat protection of the electric heating device is needed based on the standard temperature of the heating element, when the current temperature of the heating element reaches the standard temperature, the overheat protection of the electric heating device is not needed; when the current temperature of the heating element does not reach the standard temperature, the overheat protection of the electric heating device is needed.

[0043] Optionally, it is judged whether the overheat protection of the electric heating device is needed based on the temperature range of the heating element, when the current temperature of the heating element is in the temperature range, the overheat protection of the electric heating device is not needed; when the current temperature of the heating element is not in the temperature range, the overheat protection of the electric heating device is needed.

[0044] Optionally, in the embodiments of the present application, the control method can include the following. Obtain the temperature variation standard interval or the temperature rise rate variation standard interval of the heating element of the electric heating device corresponding to a first predetermined time when the medium is in a normal working state, compare the current temperature variation difference of the heating element of the electric heating device corresponding to the first predetermined time with the temperature variation standard interval or compare the current temperature rise rate variation difference of the heating element of the electric heating device corresponding to the first predetermined time with the temperature rise rate variation standard interval, to judge whether the overheat protection of the electric heating device is needed. The temperature variation or the temperature rise rate variation is the change of the temperature or the change of the temperature rise rate in a period of time, and the first predetermined time is the time interval corresponding to the calculation of the temperature variation or the temperature rise rate variation.

[0045] Specifically, if the current temperature variation difference is in the temperature variation standard interval, the overheat protection of the electric heating device is not needed; if the current temperature variation difference is not in the temperature variation standard interval, the overheat protection of the electric heating device is needed.

[0046] Specifically, if the current temperature rise rate variation difference is in the temperature rise rate variation standard interval, the overheat protection of the electric heating device is not needed; if the current temperature rise rate variation difference is not in the temperature rise rate variation standard interval, the overheat protection of the electric heating device is needed.

[0047] Optionally, in the embodiments of the present application, for how to obtain the temperature variation standard interval, the temperature rise rate variation standard interval, the current temperature variation difference, and the current temperature rise rate variation difference, the control method can include the following.

[0048] Make the electric heating device work continuously for a second working predetermined time at a predetermined power when the medium is in a normal working state, to obtain the temperature variation standard interval or the temperature rise rate variation standard interval of the heating element of the electric heating device.

[0049] and / or, continuously operating the electric heating device at a predetermined power for a second predetermined time to obtain a current temperature change difference or a current temperature rise rate difference of the heating element of the electric heating device.

[0050] wherein the ratio of the predetermined power to the maximum power of the electric heating device is 0.1 to 1, preferably 0.2 to 0.8, more preferably 0.3 to 0.6, most preferably 0.3 to 0.5.

[0051] wherein the second predetermined time is 1-120 seconds, preferably 1-60 seconds, more preferably 2-30 seconds, more preferably 2-10 seconds.

[0052] Optionally, in the embodiments of the present application, the starting point of the second predetermined time is when the electric heating device is started.

[0053] Specifically, in the embodiments of the present application, the temperature change can be observed according to the following content.

[0054] When the electric heating device starts heating, the electric heating device is controlled to continuously operate at a predetermined power for a second predetermined time, and then the electric heating device is turned off 2S, and the temperature change of the heating element is observed. Wherein the ratio of the predetermined power to the maximum power is Y%, Y can be 20-50; the predetermined time can be set to 2-10S.

[0055] When the power stops, the temperature rise rate change of the heating element is calculated, and the current temperature rise rate difference corresponding to the first predetermined time is calculated. When the current temperature rise rate difference corresponding to the first predetermined time is not in the standard interval of the temperature rise rate change corresponding to the first predetermined time, it is considered that there is a problem with the medium, and the electric heating device needs to be protected from overheating, and the heating can be stopped. The first predetermined time can be 0.5S. The temperature rise rate change standard interval can be less than a certain value, which can be set according to experiments. In addition, for different products, the value may also not be the same.

[0056] Optionally, in the embodiments of the present application, the standard running state information of the electric heating device when the medium is in a normal working state is obtained by large-scale data analysis of the running of the electric heating device. Preferably, machine learning is used to analyze the large-scale data.

[0057] Optionally, in the embodiments of the present application, the control method includes that the overheat protection of the electric heating device does not cause the locking of the electric heating device. The overheat protection of the electric heating device does not cause the locking of the electric heating device, which can avoid the non-compliance caused by the locking of the electric heating device, and can also avoid the medium cannot flow normally due to low air temperature.

[0058] Optionally, in the embodiment of the present application, when the overheat protection of the electric heating device occurs, the current running power is recorded and a low running power less than the current running power is set, the electric heating device is controlled to run at the low running power for a third predetermined time, during which if the overheat protection of the electric heating device occurs again, the low running power is re-set until the overheat protection does not occur when the electric heating device runs at the low running power for the third predetermined time. It should be noted that in the embodiment of the present application, after the low running power is re-set, the time of running at the low running power needs to be recorded again, and the running at the low running power for the third predetermined time without the overheat protection occurring can meet the end condition.

[0059] Optionally, in the embodiment of the present application, before the electric heating device is controlled to run at the low running power for the third predetermined time when the overheat protection occurs, it can be judged whether the fault recovery condition is met, and the electric heating device is controlled to run at the low running power for the third predetermined time when the fault recovery condition is met; otherwise, the electric heating device is not controlled to run at the low running power for the third predetermined time. The subsequent steps are performed when the fault recovery condition is met, and the subsequent steps are not performed when the fault recovery condition is not met. In this way, there is a buffer time before recovery, avoiding continuous dry burning in a short time.

[0060] Optionally, in the embodiment of the present application, before the electric heating device is controlled to run at the low running power for the third predetermined time when the overheat protection occurs, a waiting time is waited, and the subsequent steps are performed when the waiting time is reached. In this way, there is a buffer time before recovery, avoiding continuous dry burning in a short time.

[0061] Optionally, in the embodiment of the present application, the low running power is 50% to 90% of the current running power, preferably 60% to 80%.

[0062] Optionally, in the embodiment of the present application, the low running power can be set according to the temperature rise value of the heating element after the overheat protection of the electric heating device. Specifically, the greater the temperature rise value, the smaller the low running power. The specific value of the low running power can be calibrated according to experiments.

[0063] Optionally, in the embodiment of the present application, the third predetermined time of running at the low running power is 10-60 seconds, preferably 15 to 30 seconds, and more preferably 20 seconds.

[0064] Optionally, in the embodiment of the present application, if the overheat protection of the electric heating device does not occur when the electric heating device runs at the low running power for the third predetermined time, the running power is gradually increased to a predetermined power threshold, and if the overheat protection of the electric heating device occurs during the increase, the low running power is re-set until the predetermined power threshold is reached without the overheat protection occurring.

[0065] Optionally, in the embodiments of the present application, the form of gradually increasing the operating power can be set according to actual conditions. For example, the operating power can be gradually increased in the form of increasing by the same value each time. Alternatively, the operating power can be gradually increased in the form of increasing the power value more and more each time.

[0066] Optionally, in the embodiments of the present application, the gradually increasing the operating power to the predetermined power threshold is performed by gradually increasing the predetermined power increase value. Specifically, the operating power is increased by the predetermined power increase value each time. The specific value of the predetermined power increase value can be determined according to specific conditions.

[0067] In the embodiments of the present application, the predetermined power threshold can be determined according to specific conditions. Optionally, in the embodiments of the present application, the predetermined power threshold is 50%-90% of the maximum power of the electric heating device, preferably 60%-80%.

[0068] Optionally, in the embodiments of the present application, if the operating power of the electric heating device reaches the predetermined power threshold, the overheat protection fault state is cleared, and the electric heating device is allowed to operate at the maximum power. After reaching the predetermined power threshold, the electric heating device is allowed to operate at the maximum power, which avoids the overheat protection from resuming and the high power from continuing to dry burning.

[0069] FIG. 1 is a flowchart of a control method of an electric heating device according to a preferred embodiment of the present application. The control method provided by the embodiments of the present application will be exemplarily introduced below in combination with FIG. 1.

[0070] In step S10, it is determined whether the overheat protection of the electric heating device is needed. If yes, step S11 is performed; if no, step S10 is performed.

[0071] Specifically, the current temperature rise rate change difference of the heating element of the electric heating device corresponding to the first predetermined time is compared with the temperature rise rate change standard interval to determine whether the overheat protection of the electric heating device is needed.

[0072] In addition, in the embodiment of the present application, in the case where overheat protection is required for the electric heating device, a diagnostic trouble code (DTC) can be set, and whether overheat protection is required for the electric heating device is determined according to the state bits of the DTC. Specifically, bit0 and bit3 are used for the determination. Bit0 indicates whether the current is in a fault state, and bit0=0 indicates that the current is not in a fault state; bit0=1 indicates that the current is in a fault state. Bit3 indicates whether aging is successful, and bit3=0 indicates that aging is successful; bit3=1 indicates that aging is not successful. In the case where aging is not successful and the current is in a fault state, overheat protection is required. Specifically, whether overheat protection is required for the electric heating device can be determined by determining whether the condition "confirmation bit bit3=1 and real-time bit bit0=1" is met. In addition, in the case where it is determined that overheat protection is required for the electric heating device, the rising value of the temperature of the heating element is counted.

[0073] In step S11, it is determined whether the fault recovery condition is met. In the case where the fault recovery condition is met, step S12 is executed; otherwise, step S11 is executed.

[0074] Optionally, in the embodiment of the present application, in the case where the fault recovery condition is met, confirmation bit bit3=1 and real-time bit bit0=0 can be set, and whether the fault recovery condition is met can be determined by determining whether the condition "confirmation bit bit3=1 and real-time bit bit0=0" is met.

[0075] Optionally, in the embodiment of the present application, the fault recovery condition can be that at least one of the inlet temperature of the medium inlet of the electric heating device, the outlet temperature of the medium outlet, and the temperature of the heating element is less than a preset temperature and lasts for a fourth predetermined time. In the embodiment of the present application, the preset temperature and the fourth predetermined time can be determined according to specific conditions. For example, the preset temperature can be greater than or equal to 30 degrees Celsius and less than or equal to 50 degrees Celsius. Preferably, the preset temperature is 40 degrees Celsius. The fourth predetermined time can be greater than or equal to 50s and less than or equal to 70s. Preferably, the fourth predetermined time is 60s.

[0076] Optionally, in the embodiment of the present application, in the case where the fault recovery condition involves at least two of the inlet temperature, the outlet temperature, and the temperature of the heating element, the fault recovery condition can further include that the difference between the maximum temperature value and the minimum temperature value is less than a preset temperature difference. For example, the preset temperature difference can be greater than or equal to 3 degrees Celsius and less than or equal to 6 degrees Celsius. Preferably, the preset temperature difference is 5 degrees Celsius.

[0077] In step S12, it is judged whether the pre-aging waiting is over. If yes, step S13 is executed; if no, step S12 is executed.

[0078] In the embodiment of the present application, the aging process refers to a process of clearing the overheat protection fault state in the case of overheat protection of the electric heating device. Specifically, the aging process starts from controlling the electric heating device to operate at the low line power for a third predetermined time to the operating power of the electric heating device reaching a predetermined power threshold.

[0079] The pre-aging waiting time can be set before starting the aging process. After the fault recovery condition is met, a waiting time is waited. If the waiting time reaches the pre-aging waiting time, it is judged that the pre-aging waiting is over; if the waiting time does not reach the pre-aging waiting time, it is judged that the pre-aging waiting is not over.

[0080] Optionally, in the embodiment of the present application, the same pre-aging waiting time can be set for the number of times of the aging process, or different pre-aging waiting times can be set for the number of times of the aging process. Preferably, in the embodiment of the present application, the pre-aging waiting time can increase with the increase of the number of times of the aging process. In the process shown in FIG. 1, the pre-aging waiting time can increase with the increase of the number of times of the aging process, and the correspondence between the aging number and the pre-aging waiting time is set in advance. Specifically, the pre-aging waiting times corresponding to the aging numbers 1, 2, 3, 4, and 5 are 0, 1, 2, 5, and 30, respectively.

[0081] Specifically, in the embodiment of the present application, whether the pre-aging waiting is over can be judged by judging whether the bit3=1 and the waiting time reaches the pre-aging waiting time corresponding to the current aging number.

[0082] In step S13, the electric heating device is controlled to operate at the low line power.

[0083] In step S14, it is judged whether the overheat protection of the electric heating device is needed. If yes, step S15 is executed, the aging process is over, the aging number is increased by 1, and the pre-aging waiting time is adjusted according to the correspondence set in advance. If no, step S16 is executed. Specifically, how to judge whether the overheat protection of the electric heating device is needed can refer to the content described in the above embodiment.

[0084] In step S15, the low line power is adjusted to be low, and the time of operating the electric heating device at the low line power is cleared. In other words, after the low line power is adjusted to be low, the time is restarted when the electric heating device operates at the low line power again. After step S15 is executed, step S11 is executed.

[0085] In step S16, it is judged whether the time of running at the low power reaches a third predetermined time. If yes, step S17 is executed; if no, step S13 is executed.

[0086] In step S17, the running power is increased, and the electric heating device is controlled to run at the adjusted running power. Specifically, the running power is increased by a predetermined power increase value each time the running power is increased. After step S17 is executed, step S18 is executed.

[0087] In step S18, it is judged whether the overheat protection needs to be performed on the electric heating device. If yes, step S11 is executed. The current aging process ends, the aging number is increased by 1, and the pre-aging waiting time is adjusted according to the pre-set correspondence. If no, step S19 is executed. Specifically, how to judge whether the overheat protection needs to be performed on the electric heating device can refer to the content described in the above embodiments.

[0088] In step S19, it is judged whether the running power reaches a predetermined power threshold. If yes, step S20 is executed; if no, step S17 is executed.

[0089] In step S20, the overheat protection fault state is cleared, and the electric heating device is allowed to run at the maximum power. Specifically, bit3=0 is set, and the aging process ends.

[0090] Through the technical solutions provided by the embodiments of the present application, 1) after the overheat protection occurs, in order to protect the electric heating device, the power is restored only when specific conditions are met, so that the electric heating device can safely restore the power and still not lose the protection function; 2) during the life cycle of the electric heating device, the locking of the electric heating device caused by abnormal overheating is released, and the protection function is not lost, and the overheating is not caused frequently.

[0091] In a second aspect, the embodiments of the present application also provide an electric heating device, which is provided with a control device for executing the control method described in the above embodiments.

[0092] The preferred embodiments of the present application are described in detail above, but the present application is not limited to the specific details in the above embodiments. Within the technical concept range of the present application, various simple modifications can be made to the technical solutions of the present application, and these simple modifications all belong to the protection range of the present application.

[0093] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present application will not further describe various possible combination manners.

[0094] Moreover, the various embodiments disclosed herein can be combined in any combination, provided such combinations do not violate the spirit of the application, which is to provide a method and system for providing a user with a personalized experience.

Claims

1. A control method for an electric heating apparatus, the control method comprising: The medium state is evaluated according to the operating state of the electric heating device itself to determine whether the electric heating device needs to be protected from overheating, wherein the control method does not need to collect any operating parameters related to the medium.

2. The control method of the electric heating apparatus according to claim 1, wherein The control method includes a control method for the electric heating device in a starting phase.

3. The control method of the electric heating apparatus according to claim 1, wherein The control method includes obtaining standard operating state information of the electric heating device when the medium is in a normal working state, and comparing current operating state information of the electric heating device with the standard operating state information to determine whether the electric heating device needs to be protected from overheating.

4. The control method of the electric heating device according to claim 3, wherein, if the current operating state information of the electric heating device conforms to the standard operating state information, the electric heating device does not need to be protected from overheating, otherwise, the electric heating device needs to be protected from overheating; or if the current operating state information of the electric heating device is within an allowable range of the standard operating state information, the electric heating device does not need to be protected from overheating, otherwise, the electric heating device needs to be protected from overheating. The control method includes obtaining a standard temperature or temperature range of the heating element of the electric heating device when the medium is in a normal working state, and comparing a current temperature of the heating element of the electric heating device with the standard temperature or temperature range to determine whether the electric heating device needs to be protected from overheating.

5. The control method of the electric heating apparatus according to claim 3, wherein The control method includes obtaining a temperature change standard interval or temperature rise rate change standard interval of the heating element of the electric heating device corresponding to a first predetermined time when the medium is in a normal working state, and comparing a current temperature change difference value of the heating element of the electric heating device corresponding to the first predetermined time with the temperature change standard interval or comparing a current temperature rise rate change difference value of the heating element of the electric heating device corresponding to the first predetermined time with the temperature rise rate change standard interval to determine whether the electric heating device needs to be protected from overheating.

6. The control method of the electric heating apparatus according to claim 3, wherein The control method includes:

7. The control method of the electrical heating apparatus according to claim 3 or 4 or 5 or 6, wherein, making the electric heating device work continuously for a second predetermined time at a predetermined power when the medium is in a normal working state to obtain a temperature change standard interval or a temperature rise rate change standard interval of the heating element of the electric heating device; and / or making the electric heating device work continuously for a second predetermined time at a predetermined power to obtain a current temperature change difference value or a current temperature rise rate change difference value of the heating element of the electric heating device, wherein the ratio of the predetermined power to the maximum power of the electric heating device is 0.1 to 1, preferably 0.2 to 0.8, more preferably 0.3 to 0.6, most preferably 0.3 to 0.5; wherein the second predetermined time is 1-120 seconds, preferably 1-60 seconds, more preferably 2-30 seconds, more preferably 2-10 seconds. The starting point of the continuous work for the second predetermined time is when the electric heating device is started.

8. The control method of the electric heating apparatus according to claim 7, wherein The standard operating state information of the electric heating device when the medium is in a normal working state is obtained by large-scale data analysis of the operation of the electric heating device, preferably by machine learning analysis of large-scale data.

9. The control method of the electric heating apparatus according to claim 3, wherein ​ 10. The control method of the electric heating apparatus according to claim 1, wherein The control method comprises that the overheat protection of the electric heating device does not result in locking of the electric heating device.

11. The control method of the electric heating apparatus according to claim 10, wherein When the overheat protection of the electric heating device occurs, the current operating power is recorded and a low operating power less than the current operating power is set, the electric heating device is operated according to the low operating power for a third predetermined time, during which if the overheat protection of the electric heating device occurs again, the low operating power is re-set until the overheat protection does not occur when the electric heating device is operated according to the low operating power for the third predetermined time.

12. The control method of the electric heating apparatus according to claim 11, wherein The low operating power is 50% to 90%, preferably 60% to 80% of the current operating power.

13. The control method of the electric heating apparatus according to claim 11, wherein The third predetermined time is 10-60 seconds, preferably 15 to 30 seconds, and more preferably 20 seconds.

14. The control method of the electric heating apparatus according to claim 11, wherein If the overheat protection of the electric heating device does not occur when the electric heating device is operated according to the low operating power for the third predetermined time, the operating power is gradually increased to a predetermined power threshold, during which if the overheat protection of the electric heating device occurs, the low operating power is re-set until the overheat protection does not occur when the predetermined power threshold is reached.

15. The control method of the electric heating apparatus according to claim 14, wherein The gradual increase of the operating power to the predetermined power threshold is performed according to a gradually increasing predetermined power increase value.

16. The control method of the electric heating apparatus according to claim 14, wherein The predetermined power threshold is 50% to 90%, preferably 60% to 80% of the maximum power of the electric heating device.

17. The control method of the electric heating apparatus according to claim 14, wherein If the operating power of the electric heating device reaches the predetermined power threshold, the overheat protection fault state is cleared and the electric heating device is allowed to operate at the maximum power.

18. An electric heating device provided with a control device for performing the control method according to any one of claims 1-17.

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