Control method and control system for thermal management

Abstract

The invention provides a thermal management control method and system, the method is used for equipment needing to monitor the temperature difference of an inlet and an outlet, and the method comprises the steps: obtaining a shutdown signal of the equipment, and enabling the equipment in a working state to start to stop after receiving the shutdown signal; starting signals of the equipment are obtained, and the equipment in the shutdown state starts to work after receiving the starting signals; on the basis of the obtaining time of the shutdown signal and the starting signal, obtaining the shutdown duration of the equipment; when the shutdown duration is greater than the first preset duration, starting the temperature difference fault monitoring system; and when the shutdown duration is less than a first preset duration, temporarily shutting down the temperature difference fault monitoring system, then collecting the inlet temperature and the outlet temperature of the equipment in real time, and determining whether to start the temperature difference fault monitoring system based on the inlet temperature, the outlet temperature and the working duration after the equipment is shut down and restarted. According to the method and the system provided by the invention, the probability of false alarm can be reduced, and meanwhile, the method and the system have relatively high security.

Description

Technical Field

[0001] The present application relates to the technical field of thermal management control of battery temperature, and in particular to a thermal management control method and control system. Background Art

[0002] Some automotive devices, such as solid oxide fuel cells, hydrogen fuel cells, and other high-precision instruments, have stringent requirements for inlet and outlet temperature differences. During stable operation, these devices rely on water pumps, cooling fans, and cooling media to provide stable thermal management, ensuring the inlet and outlet temperature difference remains within a threshold.

[0003] However, when the device stops running after running for a period of time, the heat dissipation is uneven due to the differences in the internal and external cooling system structures of the device, as well as the influence of the ambient temperature. When it is restarted after a period of shutdown, the heat dissipation is uneven due to the influence of the ambient temperature and the device structure, causing the temperature difference between the inlet and outlet of the device to be greater than the threshold, causing the system to report an error and then jump out of the normal operating process. At this time, the device may not have a real fault, and the abnormal temperature difference will not affect the device. It is a false alarm, which affects the owner's experience. In related technologies, it is usually necessary to add an insulation system to the periphery of the device to avoid temperature difference false alarms caused by uneven heat dissipation during shutdown, but this increases the complexity, cost and maintenance difficulty of the equipment. Summary of the Invention

[0004] To at least partially address the above-mentioned problems, according to a first aspect of the present application, an embodiment of the present application provides a thermal management control method, which is used for equipment that requires monitoring of an inlet and outlet temperature difference, and the equipment has a temperature difference fault monitoring system for monitoring an inlet and outlet temperature difference fault, and the method includes:

[0005] Step S1: obtaining a shutdown signal of the device, wherein the device in the working state starts to shut down after receiving the shutdown signal;

[0006] Step S2: obtaining a start signal of the device, wherein the device in the shutdown state starts working after receiving the start signal;

[0007] Step S3: Obtain the downtime of the device based on the acquisition time of the stop signal and the start signal;

[0008] Step S4: When the shutdown time is longer than the first preset time, the temperature difference fault monitoring system is started;

[0009] Step S5: When the shutdown time is less than the first preset time, the temperature difference fault monitoring system is temporarily turned off, and then the inlet temperature and outlet temperature of the equipment are collected in real time. Based on the inlet temperature, outlet temperature and the working time after the equipment is shut down and restarted, it is determined whether to start the temperature difference fault monitoring system.

[0010] In some embodiments, the operating time includes a second preset time, and determining whether to start the temperature difference fault monitoring system based on the inlet temperature, the outlet temperature, and the operating time after the equipment is shut down and restarted includes:

[0011] Step S7, monitoring the temperature difference between the inlet temperature and the outlet temperature within a second preset time period;

[0012] Step S8: When the temperature difference is greater than the preset threshold within the second preset time period, re-timing the second preset time period;

[0013] Step S9: If the temperature difference has not recovered to be less than the preset threshold within the second preset time period of retiming, the temperature difference fault monitoring system is not started and a system fault warning is issued.

[0014] In some embodiments, the operating time further includes a third preset time, and determining whether to start the temperature difference fault monitoring system based on the inlet temperature, the outlet temperature, and the operating time after the equipment is shut down and restarted further includes:

[0015] Step S10: When the temperature difference is continuously less than the preset threshold value within the second preset time period, the third preset time period begins to be counted after the second preset time period is completed.

[0016] Step S11: If the temperature difference is continuously smaller than the preset threshold value within the third preset time period, the temperature difference fault monitoring system is started after the third preset time period is completed.

[0017] In some embodiments, the method further comprises:

[0018] Step S12: If the temperature difference recovers to be less than the preset threshold value within the second preset time period of re-timing, start timing the third preset time period; then execute step S11.

[0019] In some embodiments, the method further comprises:

[0020] Step S14: If the temperature difference is greater than the preset threshold within the third preset time, the second preset time is reset, and the number of abnormal times is recorded and accumulated.

[0021] In some embodiments, the method further comprises:

[0022] Step S15: If the temperature difference has not recovered to be less than the preset threshold after retiming the second preset time, the temperature difference fault monitoring system is not started and a system fault warning is issued.

[0023] In some embodiments, the method further comprises:

[0024] Step S16: If the temperature difference recovers to less than the preset threshold within the second preset time period of retiming, and the accumulated number of abnormalities is less than the preset number, retiming for the third preset time period; then execute step S11 and reset the accumulated number to zero, or execute step S14.

[0025] In some embodiments, the method further comprises:

[0026] Step S17: If the accumulated number of abnormalities is greater than or equal to the preset number, the temperature difference fault monitoring system will not be started and the system fault warning will not be issued regardless of whether the temperature difference is restored to less than the preset threshold after re-timing the second preset time, and the accumulated number will be reset to zero.

[0027] In some embodiments, the method further comprises:

[0028] Step S18: When either the inlet temperature or the outlet temperature is abnormal, the temperature difference fault monitoring system is not activated and a system fault warning is not issued.

[0029] According to the second aspect of the present application, an embodiment of the present application also provides a thermal management control system, which is used to execute the method of any embodiment of the first aspect of the present application.

[0030] The thermal management control method and control system provided in the embodiments of the present application temporarily shut down the temperature difference fault monitoring system when the equipment is shut down and restarted, and the shutdown time is less than a first preset time, to prevent false alarms caused by the temperature difference caused by the equipment structure and the ambient temperature during a short shutdown. After the temperature difference fault monitoring system is temporarily shut down, the inlet temperature, outlet temperature and working time are still monitored in real time to prevent the failure to detect the actual failure of the equipment in time, thereby ensuring the safe operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0032] Figure 1 This is a schematic diagram of the device structure provided by the embodiments of the present application;

[0033] Figure 2 This is a logic block diagram of the thermal management control method provided in an embodiment of the present application.

[0034] It should be understood that the size of each part shown in the accompanying drawings is not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions of the preferred embodiments of the present application in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection claimed in this application.

[0036] The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Terms such as "include" or "comprises" mean that the elements preceding the term encompass the elements listed after the term, and do not exclude the possibility of also encompassing other elements. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0037] Figure 1 This is a schematic diagram of the device structure provided in an embodiment of this application. For example, the device can be a solid oxide fuel cell, hydrogen fuel cell, or other battery device in an automobile, or other high-precision instrumentation. It can also be a non-automotive device, and this application does not limit this. Taking solid oxide fuel cells and hydrogen fuel cells as examples, during operation, the device requires a water pump, a cooling fan, and a cooling medium to provide stable thermal management so that the temperature difference between the device's inlet temperature T1 and outlet temperature T2 can be stably maintained within a threshold range. However, due to the significant difference in heat dissipation capacity between the device and the cooling system, the cooling medium within the cooling system (near point B) dissipates heat more quickly under the influence of ambient temperature, while the cooling medium within the device (near point A) struggles to dissipate heat. This results in uneven heat dissipation, with the temperature at point A potentially much higher than at point B, leading to a significant temperature difference between the device and the cooling system. When the device is shut down and restarted, the coolant in the cooling system flows from point B to the inlet, resulting in a lower inlet temperature T1, while the warmer coolant in the device flows from point A to the outlet, resulting in a higher outlet temperature T2. This causes the inlet and outlet temperature difference to exceed the threshold. If the temperature difference monitoring system is enabled at this time, a fault may be reported. However, this temperature difference is not caused by a system anomaly and is a false alarm, impacting the user experience. These false alarms often occur in spring and autumn. In winter, the low external temperature allows the device to cool quickly, while in summer, the high external temperature makes heat dissipation difficult, both of which keep the temperature difference between the inside and outside of the system small.

[0038] like Figure 2As shown, to at least partially solve the above-mentioned problems, according to a first aspect of the present application, an embodiment of the present application provides a thermal management control method, which is used for equipment that needs to monitor the inlet and outlet temperature difference, such as battery equipment such as solid oxide fuel cells and hydrogen fuel cells in automobiles or other high-precision instruments and equipment. The equipment has a temperature difference fault monitoring system for monitoring inlet and outlet temperature difference faults. When the inlet and outlet temperature difference is greater than a preset value, the temperature difference fault monitoring system will issue an alarm. The method includes: step S1, obtaining a shutdown signal of the equipment, wherein the equipment in the working state starts to shut down after receiving the shutdown signal; Step S2, obtaining the start signal of the device, wherein the device in the shutdown state starts working after receiving the start signal; Step S3, obtaining the shutdown time of the device based on the acquisition time of the shutdown signal and the start signal; Step S4, when the shutdown time t1 is greater than the first preset time, starting the temperature difference fault monitoring system; Step S5, when the shutdown time t is less than the first preset time, temporarily shutting down the temperature difference fault monitoring system, and then collecting the inlet temperature and outlet temperature of the device in real time, and determining whether to start the temperature difference fault monitoring system based on the inlet temperature, outlet temperature and the working time after the device is shut down and restarted. When executing the method provided in this embodiment, the device can be switched from the working state to the shutdown state, and then from the shutdown state to the working state, that is, the shutdown and restart working condition. The first preset time can be set based on an empirical value, and can usually be determined based on the time required for the temperature of the cooling medium inside and outside the device to drop to a temperature difference less than or equal to a threshold. Therefore, when the shutdown time is longer than the first preset time, the temperature of the cooling medium inside and outside the equipment can be considered not to trigger the alarm of the temperature difference fault monitoring system under normal circumstances, so that the temperature difference fault monitoring system can be normally turned on to monitor the faults that may occur during subsequent operation; and when the shutdown time is less than the first preset time, there may be a false alarm. At this time, the temperature difference fault monitoring system is first turned off, and then the inlet temperature and outlet temperature are collected in real time, and the working time of the equipment after shutdown and restart is recorded. Based on the inlet temperature, outlet temperature and the working time after the equipment is shut down and restarted, it is determined whether to start the temperature difference fault monitoring system. Therefore, without directly issuing an alarm, a comprehensive judgment is continued to determine whether a fault alarm is required or the temperature difference fault monitoring system is needed to be turned on.

[0039] The thermal management control method and control system provided in the embodiments of the present application temporarily shut down the temperature difference fault monitoring system when the equipment is shut down and restarted, and the shutdown time is less than a first preset time, to prevent false alarms caused by the temperature difference caused by the equipment structure and the ambient temperature during a short shutdown. After the temperature difference fault monitoring system is temporarily shut down, the inlet temperature, outlet temperature and working time are still monitored in real time to prevent the failure to detect the actual failure of the equipment in time, thereby ensuring the safe operation of the equipment.

[0040] In some embodiments, the operating time includes a second preset time, and determining whether to activate the temperature difference fault monitoring system is based on the inlet temperature, the outlet temperature, and the operating time after the equipment is shut down and restarted, including: step S7, monitoring the temperature difference ΔT between the inlet temperature and the outlet temperature within the second preset time (the timing starting point is the moment when the equipment is shut down and restarted); step S8, when the temperature difference is greater than a preset threshold within the second preset time, re-timing the second preset time (the timing starting point is the moment when the temperature difference becomes greater than the preset threshold); step S9, if the temperature difference still does not return to less than the preset threshold within the re-timing second preset time, then the temperature difference fault monitoring system is not activated and a system fault warning is issued. In this embodiment, when the temperature difference between the inlet temperature and the outlet temperature is greater than the preset threshold, an alarm is not temporarily issued, but the second preset time is re-timing and the inlet and outlet temperature difference is continued to be monitored. Only after the re-timing second preset time ends, if the temperature difference has not returned to within the preset threshold, a fault alarm is issued, further reducing the occurrence of false alarms, while taking into account the actual occurrence of faults, preventing missed alarms, and increasing the reliability and robustness of the system.

[0041] In some embodiments, the working time also includes a third preset time, and whether to start the temperature difference fault monitoring system is determined based on the inlet temperature, the outlet temperature, and the working time after the equipment is shut down and restarted. It also includes: step S10, when the temperature difference is continuously less than the preset threshold value within the second preset time, after the second preset time is completed, start timing the third preset time; step S11, if the temperature difference is continuously less than the preset threshold value within the third preset time, after the third preset time is completed, start the temperature difference fault monitoring system. In this embodiment, after the second preset time is completed, the third preset time is also counted. Only when the third preset time is completed and the inlet and outlet temperature difference is not greater than the preset threshold, the temperature difference fault monitoring system is started, which can further prevent the occurrence of fault omissions and increase the safety of the system. In this application, the second preset time t2 and the third preset time t3 can both be determined based on empirical values.

[0042] In some embodiments, the method further includes: step S12, if the temperature difference recovers to less than the preset threshold within the re-timed second preset time period, starting to count the third preset time period (the timing starting point is the moment when the temperature difference recovers to less than the preset threshold); and then executing step S11. In this embodiment, step S12 can be executed after step S8. When the temperature difference recovers to less than the preset threshold within the re-timed second preset time period, the third preset time period is started to perform stability verification (the timing starting point of the third preset time period is the moment when the temperature difference returns to normal) to prevent the temperature difference from increasing again and further increase safety. If no temperature difference abnormality occurs within the re-timed second preset time period and the third preset time period, it can be considered that the equipment is not faulty and the temperature difference fault monitoring system can be activated.

[0043] In some embodiments, the method further includes: step S14: if the temperature difference exceeds a preset threshold within the third preset time period, re-counting the second preset time period, and recording and accumulating the number of abnormalities. In this embodiment, when a temperature difference abnormality occurs within the third preset time period, an alarm is not directly issued. Instead, the second preset time period is re-counted to prevent false alarms. The number of occurrences of this situation is also counted to facilitate fault diagnosis.

[0044] In some embodiments, the method further includes: step S15: if the temperature difference has not returned to a value less than a preset threshold after re-timing for the second preset time period, then the temperature difference fault monitoring system is not activated and a system fault warning is issued. If the temperature difference has not returned to a normal range after the second preset time period has expired, then a fault is considered to have occurred and an alarm may be issued, thereby increasing system safety.

[0045] In some embodiments, the method further includes: step S16, if the temperature difference is restored to be less than the preset threshold within the second preset time period of re-timing, and the accumulated number of abnormal times (i.e. Figure 2 If the flag bit in the error field is less than the preset number of times, the third preset time duration is reset; then step S11 is executed and the accumulated number of times is reset to zero, or step S14 is executed. In this embodiment, a comprehensive judgment is made based on the temperature difference range and the accumulated number of abnormalities, which increases the safety of the system. For example, the preset number of times can be 3.

[0046] In some embodiments, the method further includes: step S17: if the accumulated number of abnormalities is greater than or equal to a preset number, then after re-timing for the second preset time period, regardless of whether the temperature difference has recovered to less than a preset threshold, the temperature difference fault monitoring system is not activated and a system fault warning is not issued, and the accumulated number is reset to zero. In this embodiment, if the accumulated number of abnormalities is too high, it can be considered that a system fault exists, and a system fault warning is directly issued, thereby increasing the safety of the system.

[0047] In some embodiments, the method further includes: step S18: when either the inlet temperature or the outlet temperature is abnormal, the temperature difference fault monitoring system is not activated and a system fault warning is not issued. In this embodiment, the inlet temperature or the outlet temperature is monitored in real time, and a fault warning is directly issued once the inlet temperature or the outlet temperature deviates from the normal range, further enhancing the safety of the system.

[0048] In addition, it should be noted that in some embodiments of the present application, when making size judgments, no additional explanation is given for the case where the two are equal. This is because the case where the two are equal can be classified as greater than or less than according to actual needs. However, it can be understood that no matter which case it is, it has no substantial impact on the implementation and effect of this technical solution, so it will not be explained separately.

[0049] According to the second aspect of the present application, an embodiment of the present application also provides a thermal management control system, which is used to execute the method of any embodiment of the first aspect of the present application.

[0050] The thermal management control method and control system provided by the embodiments of the present application can effectively avoid false alarms of system failures caused by uneven heat dissipation due to the structure and external environment during the system startup and operation, can effectively improve the reliability and robustness of the system, and can be applied to various complex environments; there is no need to increase additional costs, and it can be implemented through existing components, which is simple to implement and greatly reduces cost investment.

[0051] Based on the above-mentioned embodiments of the present application, in the absence of explicit negation or conflict, the technical features of one embodiment may be beneficially combined with one or more other embodiments.

[0052] Although some specific embodiments of the present application have been described in detail through examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the present application. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A thermal management control method, the method being used for a device that needs to monitor the inlet and outlet temperature difference, the device having a temperature difference fault monitoring system for monitoring the inlet and outlet temperature difference fault, characterized in that: The method comprises: Step S1: obtaining a shutdown signal of the device, wherein the device in the working state starts to shut down after receiving the shutdown signal; Step S2: obtaining a start signal of the device, wherein the device in the shutdown state starts working after receiving the start signal; Step S3: obtaining the downtime of the device based on the acquisition time of the stop signal and the start signal; Step S4: when the shutdown time is longer than a first preset time, starting the temperature difference fault monitoring system; Step S5: When the shutdown time is less than the first preset time, the temperature difference fault monitoring system is temporarily turned off, and then the inlet temperature and outlet temperature of the equipment are collected in real time. Based on the inlet temperature, the outlet temperature and the working time after the equipment is shut down and restarted, it is determined whether to start the temperature difference fault monitoring system.

2. The method according to claim 1, characterized in that The working time includes a second preset time, and determining whether to start the temperature difference fault monitoring system based on the inlet temperature, the outlet temperature, and the working time after the equipment is shut down and restarted includes: Step S7, monitoring the temperature difference between the inlet temperature and the outlet temperature within a second preset time period; Step S8: When the temperature difference is greater than a preset threshold within the second preset time period, re-timing the second preset time period; Step S9: If the temperature difference has not recovered to be less than the preset threshold within the second preset time period of retiming, the temperature difference fault monitoring system is not started and a system fault warning is issued.

3. The method according to claim 2, characterized in that The working time also includes a third preset time, and determining whether to start the temperature difference fault monitoring system based on the inlet temperature, the outlet temperature, and the working time after the equipment is shut down and restarted, further includes: Step S10: When the temperature difference is continuously less than the preset threshold value within the second preset time period, after the second preset time period is completed, the third preset time period is started; Step S11: If the temperature difference is continuously less than the preset threshold value within the third preset time period, the temperature difference fault monitoring system is started after the third preset time period is completed.

4. The method according to claim 3, characterized in that Also includes: Step S12: If the temperature difference is restored to be less than the preset threshold within the second preset time period, start timing the third preset time period; Then execute step S11.

5. The method according to claim 3 or 4, characterized in that Also includes: Step S14: If the temperature difference is greater than the preset threshold within the third preset time period, the second preset time period is reset, and the number of abnormalities is recorded and accumulated.

6. The method according to claim 5, characterized in that Also includes: Step S15: If the temperature difference has not recovered to be less than the preset threshold after retiming the second preset time period, the temperature difference fault monitoring system is not started and a system fault warning is issued.

7. The method according to claim 5, characterized in that Also includes: Step S16: If the temperature difference is restored to be less than the preset threshold within the second preset time period, and the accumulated number of abnormalities is less than the preset number, the third preset time period is restarted; Then, step S11 is executed and the accumulated times are reset to zero, or step S14 is executed.

8. The method according to claim 7, characterized in that Also includes: Step S17: If the accumulated number of abnormalities is greater than or equal to the preset number, the temperature difference fault monitoring system will not be started and a system fault warning will not be issued regardless of whether the temperature difference is restored to less than the preset threshold after re-timing for the second preset time, and the accumulated number will be reset to zero.

9. The method according to claim 1, characterized in that Also includes: Step S18: When either the inlet temperature or the outlet temperature is abnormal, the temperature difference fault monitoring system is not started and a system fault warning is not issued.

10. A thermal management control system, characterized in that: The system is used to execute the method according to any one of claims 1 to 9.

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