Heater over-temperature prediction method and device, vehicle-mounted equipment and vehicle

Abstract

The invention relates to a heater over-temperature prediction method and device, vehicle-mounted equipment and a vehicle, and the method comprises the steps: obtaining a historical pressure value and a current-moment pressure value of a liquid inlet end of a heater, and a historical pressure value and a current-moment pressure value of a liquid outlet end of the heater, correcting the current-moment pressure value of the liquid inlet end, and obtaining a first corrected pressure value; correcting the pressure value of the liquid outlet end at the current moment to obtain a second corrected pressure value, calculating a pressure difference value between the first corrected pressure value and the second corrected pressure value, recording the pressure difference value as a pressure difference value at the current moment, and performing over-temperature prediction on the heater based on a comparison result of an absolute value of the pressure difference value at the current moment and a preset difference threshold value; according to the method, the judgment result of the over-temperature risk of the heater can be obtained in time in the initial stage of the heater starting to work, and the problem that the service life of the heater is affected due to hysteresis of the judgment result when the heater is judged to be over-temperature through the temperature of the liquid in the loop is solved.

Description

Technical Field

[0001] This application relates to the technical field of heater over-temperature prediction, and in particular, to a method and device for predicting heater over-temperature, an in-vehicle device, and a vehicle. Background Art

[0002] In the field of new energy vehicles, compared with traditional vehicles, pure electric vehicles and the pure electric mode of hybrid vehicles face a significant technical challenge that there is no engine as a direct heat source. How to meet the heating requirements of the passenger compartment and the heating requirements of the battery system in the pure electric mode has become a technical problem that new energy vehicles urgently need to overcome.

[0003] In this case, the Positive Temperature Coefficient (PTC) technology emerged. Due to its efficient and reliable heating performance, PTC is widely used in new energy vehicles. However, since the unit value of PTC is relatively high and it may face various potential damage risks in actual applications, such as over-temperature, which may shorten the service life of PTC and thus increase the vehicle maintenance cost. Therefore, it is crucial to detect the over-temperature of PTC.

[0004] In the related art, in the initial stage when the PTC starts to work, the over-temperature detection of the PTC is to detect the temperature of the liquid in the circuit through a temperature sensor. If the detected temperature of the liquid in the circuit exceeds the temperature limit, it is determined that the PTC is over-temperature, and the PTC fault is reported and the machine is stopped. However, at this time, the ceramic sheet of the PTC has already been over-temperature. Even if the machine is stopped at this time, it has already affected the life of the PTC. Therefore, it is necessary to improve the PTC over-temperature detection method in the related art. Summary of the Invention

[0005] In view of the above-mentioned disadvantages of the prior art, this application provides a method and device for predicting heater over-temperature, an in-vehicle device, and a vehicle to solve the above technical problems.

[0006] A method for predicting over-temperature of a heater provided in this application, the method includes: obtaining the historical pressure value and the current moment pressure value at the liquid inlet end of the heater, as well as the historical pressure value and the current moment pressure value at the liquid outlet end of the heater; determining the pressure range at the liquid inlet end according to the historical pressure value at the liquid inlet end and a preset pressure change amount, and based on the pressure range at the liquid inlet end, correcting the current moment pressure value at the liquid inlet end to obtain a first corrected pressure value; determining the pressure range at the liquid outlet end according to the historical pressure value at the liquid outlet end and the preset pressure change amount, and based on the pressure range at the liquid outlet end, correcting the current moment pressure value at the liquid outlet end to obtain a second corrected pressure value; calculating the pressure difference between the first corrected pressure value and the second corrected pressure value, denoted as the current moment pressure difference, and based on the comparison result between the absolute value of the current moment pressure difference and a preset difference threshold, predicting over-temperature of the heater.

[0007] In an embodiment of this application, if the historical pressure value at the liquid inlet end includes the pressure value at the previous moment at the liquid inlet end, the process of determining the pressure range at the liquid inlet end according to the historical pressure value at the liquid inlet end and a preset pressure change amount includes: taking the sum of the pressure value at the previous moment at the liquid inlet end and the preset pressure change amount as the upper limit value of the pressure range at the liquid inlet end; taking the difference between the pressure value at the previous moment at the liquid inlet end and the preset pressure change amount as the lower limit value of the pressure range at the liquid inlet end.

[0008] In an embodiment of this application, the process of correcting the current moment pressure value at the liquid inlet end based on the pressure range at the liquid inlet end to obtain a first corrected pressure value includes: if the current moment pressure value at the liquid inlet end is within the pressure range at the liquid inlet end, taking the current moment pressure value at the liquid inlet end as the first corrected pressure value; if the current moment pressure value at the liquid inlet end is not within the pressure range at the liquid inlet end, calculating the difference between the current moment pressure value at the liquid inlet end and the upper limit value of the pressure range at the liquid inlet end, denoted as the first difference; and calculating the difference between the current moment pressure value at the liquid inlet end and the lower limit value of the pressure range at the liquid inlet end, denoted as the second difference; if the absolute value of the first difference is less than the absolute value of the second difference, taking the upper limit value of the pressure range at the liquid inlet end as the first corrected pressure value; if the absolute value of the first difference is greater than the absolute value of the second difference, taking the lower limit value of the pressure range at the liquid inlet end as the first corrected pressure value.

[0009] In an embodiment of the present application, the process of over-temperature prediction for the heater based on the comparison result between the absolute value of the pressure difference at the current moment and the preset difference threshold includes: If within the preset duration from the start of heating of the heater, the absolute value of the pressure difference at the current moment is greater than the preset difference threshold, it is determined that the heater has no over-temperature risk, and the historical pressure value of the liquid inlet end, the pressure value of the liquid inlet end at the current moment, the historical pressure value of the liquid outlet end, and the pressure value of the liquid outlet end at the current moment at subsequent moments are obtained, and over-temperature prediction for the heater is performed based on the historical pressure value of the liquid inlet end, the pressure value of the liquid inlet end at the current moment, the historical pressure value of the liquid outlet end, and the pressure value of the liquid outlet end at the current moment at subsequent moments; If within the preset duration from the start of heating of the heater, the absolute value of the pressure difference at the current moment is less than or equal to the preset difference threshold, and / or if the absolute values of the pressure differences calculated at multiple consecutive moments after the current moment are all less than or equal to the preset difference threshold, it is determined that the heater has an over-temperature risk.

[0010] In an embodiment of the present application, before obtaining the historical pressure value and the pressure value at the current moment of the liquid inlet end of the heater, and the historical pressure value and the pressure value at the current moment of the liquid outlet end of the heater, the method includes:

[0011] Collect the pressure values of the liquid inlet end of the heater and the pressure values of the liquid outlet end of the heater according to a preset sampling period; Calculate the average value of the pressure values of the liquid inlet end of the heater within each preset time period to obtain multiple pressure average values of the liquid inlet end; And calculate the average value of the pressure values of the liquid outlet end of the heater within each preset time period to obtain multiple pressure average values of the liquid outlet end; The preset time period is a multiple of the preset sampling period; Sort the multiple preset time periods in chronological order, take the pressure average value of the liquid inlet end corresponding to the last sorted preset time period as the pressure value of the liquid inlet end at the current moment, and take the pressure average values of the liquid inlet end corresponding to the other sorted positions of the preset time periods as the historical pressure values of the liquid inlet end; Take the pressure average value of the liquid outlet end corresponding to the last sorted preset time period as the pressure value of the liquid outlet end at the current moment; Take the pressure average values of the liquid outlet end corresponding to the other sorted positions of the preset time periods as the historical pressure values of the liquid outlet end.

[0012] In an embodiment of the present application, before collecting the pressure value at the liquid inlet end of the heater and the pressure value at the liquid outlet end of the heater according to a preset sampling period, the method includes: monitoring the working state signals of the first pressure sensor and the second pressure sensor; the first pressure sensor is installed on the liquid inlet pipeline of the heater; the second pressure sensor is installed on the liquid outlet pipeline of the heater; the working state signals include a normal state signal and an abnormal state signal; the abnormal state signal includes a short - circuit signal and an open - circuit signal; if the working state signal of the first pressure sensor is the abnormal state signal, and / or, the working state signal of the second pressure sensor is the abnormal state signal, then it is determined that the water circuit is abnormal, a water - circuit fault is reported, and the response to the work request is refused; if the working state signal of the first pressure sensor is the normal state signal and the working state signal of the second pressure sensor is the normal state signal, then control the first pressure sensor to collect the pressure value and control the second pressure sensor to collect the pressure value.

[0013] In an embodiment of the present application, after obtaining the first corrected pressure value and the second corrected pressure value, the method includes: storing the first corrected pressure value and the second corrected pressure value, sending the first corrected pressure value and the second corrected pressure value to the server or the control terminal, and starting to calculate the pressure difference at the current moment after receiving the over - temperature prediction instruction from the server or the control terminal.

[0014] According to one aspect of the embodiments of the present application, a heater over - temperature prediction device is provided. The device includes: a pressure acquisition module, configured to acquire the historical pressure value and the current - moment pressure value at the liquid inlet end of the heater, and the historical pressure value and the current - moment pressure value at the liquid outlet end of the heater; a first pressure correction module, configured to determine the pressure range at the liquid inlet end according to the historical pressure value at the liquid inlet end and a preset pressure change amount, and based on the pressure range at the liquid inlet end, correct the current - moment pressure value at the liquid inlet end to obtain a first corrected pressure value; a second pressure correction module, configured to determine the pressure range at the liquid outlet end according to the historical pressure value at the liquid outlet end and the preset pressure change amount, and based on the pressure range at the liquid outlet end, correct the current - moment pressure value at the liquid outlet end to obtain a second corrected pressure value; a state determination module, configured to calculate the pressure difference between the first corrected pressure value and the second corrected pressure value, denoted as the pressure difference at the current moment, and based on the comparison result between the absolute value of the pressure difference at the current moment and a preset difference threshold, perform over - temperature prediction on the heater.

[0015] According to one aspect of the embodiments of the present application, a vehicle-mounted device is provided, including: one or more processors; a storage device for storing one or more programs, which, when executed by the one or more processors, enable the vehicle-mounted device to implement the heater over-temperature prediction method as described above.

[0016] According to one aspect of the embodiments of the present application, a vehicle is provided, which includes the heater over-temperature prediction device as described above or the vehicle-mounted device as described above.

[0017] Advantages of the present application: By obtaining the historical pressure value and the current pressure value at the liquid inlet end of the heater, as well as the historical pressure value and the current pressure value at the liquid outlet end of the heater, determining the pressure range at the liquid inlet end according to the historical pressure value at the liquid inlet end and the preset pressure change amount, and based on the pressure range at the liquid inlet end, correcting the current pressure value at the liquid inlet end to obtain the first corrected pressure value, determining the pressure range at the liquid outlet end according to the historical pressure value at the liquid outlet end and the preset pressure change amount, and based on the pressure range at the liquid outlet end, correcting the current pressure value at the liquid outlet end to obtain the second corrected pressure value, calculating the pressure difference between the first corrected pressure value and the second corrected pressure value, denoted as the current pressure difference, and based on the comparison result between the absolute value of the current pressure difference and the preset difference threshold, predicting the over-temperature of the heater. In the above process, by using the historical pressure value and the current pressure value at the liquid inlet end of the heater, as well as the historical pressure value and the current pressure value at the liquid outlet end of the heater to predict the over-temperature of the heater, it is possible to obtain the determination result of the over-temperature risk of the heater in a timely manner at the initial stage when the heater starts to work, avoiding the problem that the determination result is lagged when determining the over-temperature of the heater by the temperature of the liquid in the loop, which affects the life of the heater; in addition, by correcting the current pressure value at the liquid inlet end through the pressure range at the liquid inlet end and correcting the current pressure value at the liquid outlet end through the pressure range at the liquid outlet end, the first corrected pressure value and the second corrected pressure value conform to the pressure change law, thereby improving the accuracy of the pressure data at the liquid inlet end and the liquid outlet end, and further improving the accuracy of the over-temperature state determination.

[0018] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. Description of the Drawings

[0019] The drawings here are incorporated into the specification and constitute a part of this specification, showing the embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0020] Figure 1 It is a schematic diagram of an exemplary system architecture shown in an exemplary embodiment of the present application;

[0021] Figure 2 It is a flowchart of a method for predicting over-temperature of a heater shown in an exemplary embodiment of the present application;

[0022] Figure 3 It is a flowchart of a method for predicting over-temperature of a heater shown in another exemplary embodiment of the present application;

[0023] Figure 4 It is a block diagram of a device for predicting over-temperature of a heater shown in an exemplary embodiment of the present application;

[0024] Figure 5 It shows a schematic structural diagram of a computer system of an in-vehicle device suitable for implementing the embodiments of the present application. Detailed implementation manners

[0025] The following will describe the embodiments of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for explaining the present application and not for limiting the protection scope of the present application.

[0026] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner. Therefore, only the components related to the present application are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The types, quantities, and proportions of the components in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0027] In the following description, a large number of details are explored to provide a more thorough explanation of the embodiments of the present application. However, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present application difficult to understand.

[0028] Figure 1 It is a schematic diagram of an exemplary system architecture shown in an exemplary embodiment of the present application.

[0029] Refer to Figure 1As shown in the figure, the system architecture may include a collection device 101 and a vehicle-mounted controller 102. Among them, the vehicle-mounted controller 102 may be at least one of a desktop Graphics Processing Unit (GPU) computer, a GPU computing cluster, a neural network computer, etc. Relevant technicians can use the vehicle-mounted controller 102 to obtain the historical pressure value and the current pressure value at the liquid inlet end of the heater, as well as the historical pressure value and the current pressure value at the liquid outlet end of the heater. According to the historical pressure value at the liquid inlet end and the preset pressure change amount, determine the pressure range at the liquid inlet end, and based on the pressure range at the liquid inlet end, correct the current pressure value at the liquid inlet end to obtain the first corrected pressure value. According to the historical pressure value at the liquid outlet end and the preset pressure change amount, determine the pressure range at the liquid outlet end, and based on the pressure range at the liquid outlet end, correct the current pressure value at the liquid outlet end to obtain the second corrected pressure value. Calculate the pressure difference between the first corrected pressure value and the second corrected pressure value, denoted as the current pressure difference, and based on the comparison result between the absolute value of the current pressure difference and the preset difference threshold, perform over-temperature prediction on the heater. The collection device 101 is used to collect the historical pressure value and the current pressure value at the liquid inlet end of the heater, as well as the historical pressure value and the current pressure value at the liquid outlet end of the heater, and after collecting the historical pressure value and the current pressure value at the liquid inlet end of the heater, and the historical pressure value and the current pressure value at the liquid outlet end of the heater, provide them to the vehicle-mounted controller 102 for processing.

[0030] Schematically, after the vehicle-mounted controller 102 obtains the historical pressure value and the current pressure value at the liquid inlet end of the heater in the acquisition device 101, and the historical pressure value and the current pressure value at the liquid outlet end of the heater, it determines the pressure range at the liquid inlet end according to the historical pressure value at the liquid inlet end and the preset pressure change amount, and based on the pressure range at the liquid inlet end, corrects the current pressure value at the liquid inlet end to obtain the first corrected pressure value. According to the historical pressure value at the liquid outlet end and the preset pressure change amount, it determines the pressure range at the liquid outlet end, and based on the pressure range at the liquid outlet end, corrects the current pressure value at the liquid outlet end to obtain the second corrected pressure value. It calculates the pressure difference between the first corrected pressure value and the second corrected pressure value, denoted as the current pressure difference, and based on the comparison result between the absolute value of the current pressure difference and the preset difference threshold, performs over-temperature prediction on the heater. Through the above process, by using the historical pressure value and the current pressure value at the liquid inlet end of the heater, and the historical pressure value and the current pressure value at the liquid outlet end of the heater to perform over-temperature prediction on the heater, it can obtain the determination result of the over-temperature risk of the heater in a timely manner at the initial stage when the heater starts to work, avoiding the problem that the determination result is lagged when determining the over-temperature of the heater by the temperature of the liquid in the loop, thereby affecting the life of the heater. In addition, by correcting the current pressure value at the liquid inlet end through the pressure range at the liquid inlet end and correcting the current pressure value at the liquid outlet end through the pressure range at the liquid outlet end, the first corrected pressure value and the second corrected pressure value conform to the pressure change law, thereby improving the accuracy of the pressure data at the liquid inlet end and the pressure data at the liquid outlet end, and further improving the accuracy of the over-temperature state determination.

[0031] It should be noted that the heater over-temperature prediction method provided by the embodiments of the present application is generally executed by the vehicle-mounted controller 102. Correspondingly, the heater over-temperature prediction device is generally arranged in the vehicle-mounted controller 102.

[0032] The implementation details of the technical solutions of the embodiments of the present application are elaborated in detail below:

[0033] Figure 2 It is a flowchart of the heater over-temperature prediction method shown in an exemplary embodiment of the present application. This heater over-temperature prediction method can be executed by a computing device, and this computing device can be Figure 1 the vehicle-mounted controller 102 shown in Figure 2 As shown, this heater over-temperature prediction method includes at least steps S210 to S240, which are introduced in detail as follows:

[0034] In step S210, obtain the historical pressure value and the current pressure value at the liquid inlet end of the heater, and the historical pressure value and the current pressure value at the liquid outlet end of the heater.

[0035] In an embodiment of the present application, the historical pressure value at the liquid inlet end includes the pressure values at the liquid inlet end before the current moment. The pressure values before the current moment can be one or multiple. Among them, the liquid in the heater includes, but is not limited to, water, silicone oil, mineral oil, ethylene glycol solution, deionized water, fluorinated liquid, etc., which not only plays a role in protecting the heater but also plays a role in timely heat conduction, and specific limitations are not provided here. The historical pressure value at the liquid outlet end includes the pressure values at the liquid outlet end before the current moment. The pressure values before the current moment can be one or multiple, and specific limitations are not provided here.

[0036] In step S220, according to the historical pressure value at the liquid inlet end and the preset pressure change amount, determine the pressure range at the liquid inlet end, and based on the pressure range at the liquid inlet end, correct the pressure value at the current moment at the liquid inlet end to obtain the first corrected pressure value.

[0037] In this embodiment, the preset pressure change amount is the change amount of pressure within a unit time. The change amount of pressure within a unit time needs to be set according to the actual situation, and specific limitations are not provided here.

[0038] In this embodiment, by correcting the pressure value at the current moment at the liquid inlet end through the pressure range at the liquid inlet end, the first corrected pressure value conforms to the pressure change law (that is, the change amount of the pressure value at the current moment at the liquid inlet end relative to the pressure value at the previous moment at the liquid inlet end is less than or equal to the preset pressure change amount), thereby improving the accuracy of the pressure data at the liquid inlet end.

[0039] In step S230, according to the historical pressure value at the liquid outlet end and the preset pressure change amount, determine the pressure range at the liquid outlet end, and based on the pressure range at the liquid outlet end, correct the pressure value at the current moment at the liquid outlet end to obtain the second corrected pressure value.

[0040] In this embodiment, by correcting the pressure value at the current moment at the liquid outlet end through the pressure range at the liquid outlet end, the second corrected pressure value conforms to the pressure change law (that is, the change amount of the pressure value at the current moment at the liquid outlet end relative to the pressure value at the previous moment at the liquid outlet end is less than or equal to the preset pressure change amount), thereby improving the accuracy of the pressure data at the liquid outlet end.

[0041] In step S240, calculate the pressure difference between the first corrected pressure value and the second corrected pressure value, denoted as the pressure difference at the current moment, and based on the comparison result between the absolute value of the pressure difference at the current moment and the preset difference threshold, perform over-temperature prediction on the heater.

[0042] In this embodiment, by using the historical pressure value and the current pressure value at the liquid inlet end of the heater, as well as the historical pressure value and the current pressure value at the liquid outlet end of the heater, over-temperature prediction of the heater is performed, and a determination result of the over-temperature risk of the heater can be obtained in a timely manner at the initial stage when the heater starts to work, avoiding the problem that the determination result has hysteresis when determining the over-temperature of the heater by the temperature of the liquid in the loop, thereby affecting the service life of the heater; and by using the pressure range at the liquid inlet end to correct the current pressure value at the liquid inlet end, and using the pressure range at the liquid outlet end to correct the current pressure value at the liquid outlet end, the first corrected pressure value and the second corrected pressure value conform to the pressure change law, thereby improving the accuracy of the pressure data at the liquid inlet end and the liquid outlet end, and further improving the accuracy of the over-temperature state determination.

[0043] Compared with the existing temperature method for determining whether the heater is over-temperature, the present application can accurately determine whether there is a lack of liquid or whether the liquid is flowing in the heater loop, thereby improving the accuracy of the over-temperature state determination.

[0044] In an embodiment of the present application, if the historical pressure value at the liquid inlet end includes the pressure value at the previous moment at the liquid inlet end, the process of determining the pressure range at the liquid inlet end according to the historical pressure value at the liquid inlet end and the preset pressure change amount includes:

[0045] Taking the sum of the pressure value at the previous moment at the liquid inlet end and the preset pressure change amount as the upper limit value of the pressure range at the liquid inlet end.

[0046] In this embodiment, taking the unit time as seconds as an example, the preset pressure change amount can be 2 kPa / s or other values.

[0047] Taking the difference between the pressure value at the previous moment at the liquid inlet end and the preset pressure change amount as the lower limit value of the pressure range at the liquid inlet end.

[0048] In this embodiment, the process of determining the pressure range at the liquid outlet end according to the historical pressure value at the liquid outlet end and the preset pressure change amount includes: the historical pressure value at the liquid outlet end includes the pressure value at the previous moment at the liquid outlet end, taking the sum of the pressure value at the previous moment at the liquid outlet end and the preset pressure change amount as the upper limit value of the pressure range at the liquid outlet end; taking the difference between the pressure value at the previous moment at the liquid outlet end and the preset pressure change amount as the lower limit value of the pressure range at the liquid outlet end.

[0049] In an embodiment of the present application, the process of correcting the current pressure value at the liquid inlet end based on the pressure range at the liquid inlet end to obtain the first corrected pressure value includes:

[0050] If the current pressure value at the liquid inlet end is within the pressure range at the liquid inlet end, taking the current pressure value at the liquid inlet end as the first corrected pressure value.

[0051] In this embodiment, if the pressure value at the current moment at the liquid inlet end is within the pressure range of the liquid inlet end, it indicates that the pressure value at the current moment at the liquid inlet end conforms to the pressure change law, and then the pressure value at the current moment at the liquid inlet end is used as the first corrected pressure value.

[0052] If the pressure value at the current moment at the liquid inlet end is not within the pressure range of the liquid inlet end, calculate the difference between the pressure value at the current moment at the liquid inlet end and the upper limit value of the pressure range of the liquid inlet end, denoted as the first difference; and calculate the difference between the pressure value at the current moment at the liquid inlet end and the lower limit value of the pressure range of the liquid inlet end, denoted as the second difference.

[0053] In this embodiment, if the pressure value at the current moment at the liquid inlet end is not within the pressure range of the liquid inlet end, it indicates that the pressure value at the current moment at the liquid inlet end is an invalid value, and it is necessary to correct the pressure value at the current moment at the liquid inlet end.

[0054] If the absolute value of the first difference is less than the absolute value of the second difference, the upper limit value of the pressure range of the liquid inlet end is used as the first corrected pressure value.

[0055] In this embodiment, if the absolute value of the first difference is less than the absolute value of the second difference, it indicates that the gap between the pressure value at the current moment at the liquid inlet end and the upper limit value of the pressure range of the liquid inlet end is small, and then the upper limit value of the pressure range of the liquid inlet end is used as the first corrected pressure value.

[0056] If the absolute value of the first difference is greater than the absolute value of the second difference, the lower limit value of the pressure range of the liquid inlet end is used as the first corrected pressure value.

[0057] In this embodiment, if the absolute value of the first difference is less than the absolute value of the second difference, it indicates that the gap between the pressure value at the current moment at the liquid inlet end and the lower limit value of the pressure range of the liquid inlet end is small, and then the lower limit value of the pressure range of the liquid inlet end is used as the first corrected pressure value.

[0058] In this embodiment, by correcting the pressure value at the current moment at the liquid inlet end, the invalid pressure data at the liquid inlet end is removed, and the accuracy of the pressure data at the liquid inlet end is improved.

[0059] In this embodiment, the process of correcting the current pressure value at the liquid outlet end based on the pressure range at the liquid outlet end to obtain the second corrected pressure value includes: if the current pressure value at the liquid outlet end is within the pressure range at the liquid outlet end, then use the current pressure value at the liquid outlet end as the second corrected pressure value; if the current pressure value at the liquid outlet end is not within the pressure range at the liquid outlet end, then calculate the difference between the current pressure value at the liquid outlet end and the upper limit value of the pressure range at the liquid outlet end, denoted as the third difference; and calculate the difference between the current pressure value at the liquid outlet end and the lower limit value of the pressure range at the liquid outlet end, denoted as the fourth difference; if the absolute value of the third difference is less than the absolute value of the fourth difference, then use the upper limit value of the pressure range at the liquid outlet end as the second corrected pressure value; if the absolute value of the third difference is greater than the absolute value of the fourth difference, then use the lower limit value of the pressure range at the liquid outlet end as the second corrected pressure value.

[0060] In this embodiment, by correcting the current pressure value at the liquid outlet end, invalid pressure data at the liquid outlet end is removed, improving the accuracy of the pressure data at the liquid outlet end.

[0061] In an embodiment of the present application, the process of predicting overheating of the heater based on the comparison result between the absolute value of the current pressure difference and the preset difference threshold includes:

[0062] If, within the preset duration from the start of heating of the heater, the absolute value of the current pressure difference is greater than the preset difference threshold, then it is determined that the heater has no overheating risk, and the historical pressure value of the liquid inlet end at a subsequent moment, the current pressure value of the liquid inlet end, the historical pressure value of the liquid outlet end, and the current pressure value of the liquid outlet end are obtained, and overheating prediction of the heater is performed based on the historical pressure value of the liquid inlet end at a subsequent moment, the current pressure value of the liquid inlet end, the historical pressure value of the liquid outlet end, and the current pressure value of the liquid outlet end.

[0063] In this embodiment, taking the subsequent moment as the next moment as an example, the process of predicting overheating of the heater based on the historical pressure value of the liquid inlet end at the next moment, the pressure value of the liquid inlet end at the current moment, the historical pressure value of the liquid outlet end, and the pressure value of the liquid outlet end at the current moment includes: determining the first updated pressure range of the liquid inlet end according to the pressure value of the liquid inlet end at the current moment and the preset pressure change amount, and correcting the pressure value of the liquid inlet end at the next moment based on the first updated pressure range of the liquid inlet end to obtain the first updated pressure value; determining the first updated pressure range of the liquid outlet end according to the pressure value of the liquid outlet end at the current moment and the preset pressure change amount, and correcting the pressure value of the liquid outlet end at the next moment based on the first updated pressure range of the liquid outlet end to obtain the second updated pressure value; calculating the pressure difference between the first updated pressure value and the second updated pressure value, denoted as the first updated pressure difference, and comparing the absolute value of the first updated pressure difference with the preset difference threshold. If the absolute value of the first updated pressure difference is greater than the preset difference threshold within the preset duration from the start of heating of the heater, it is determined that the heater has no overheating risk; if the absolute value of the first updated pressure difference is less than or equal to the preset difference threshold within the preset duration from the start of heating of the heater, and / or if the absolute values of the pressure differences calculated for a continuous plurality of moments after the next moment are all less than or equal to the preset difference threshold, it is determined that the heater has an overheating risk.

[0064] In this embodiment, at each subsequent moment, the process of predicting overheating of the heater based on the historical pressure value of the liquid inlet end, the pressure value of the liquid inlet end at the current moment, the historical pressure value of the liquid outlet end, and the pressure value of the liquid outlet end at the current moment is the same as the process of predicting overheating of the heater at the next moment based on the historical pressure value of the liquid inlet end, the pressure value of the liquid inlet end at the current moment, the historical pressure value of the liquid outlet end, and the pressure value of the liquid outlet end at the current moment.

[0065] In this embodiment, the preset difference threshold is set according to the actual situation and will not be specifically limited here. Since there will be a pressure difference when the liquid flows in the heater circuit, when the absolute value of the pressure difference between the liquid inlet end and the liquid outlet end of the heater at the current moment is greater than the preset difference threshold, it indicates that the flow rate of the liquid in the heater circuit is normal, the amount of liquid in the circuit is normal, and within the preset duration from the start of heating of the heater, it is determined that the heater has no overheating risk.

[0066] In this embodiment, the preset duration can be limited according to the actual situation. Within the preset duration, the liquid temperature in the heater circuit will not exceed the overheating standard value. If it exceeds the preset duration from the start of heating of the heater, the overheating of the heater is predicted based on the liquid temperature collected by the temperature sensor set on the heater circuit, the historical pressure value and the current moment pressure value of the liquid inlet end of the heater, and the historical pressure value and the current moment pressure value of the liquid outlet end of the heater.

[0067] In this embodiment, the process of predicting overheating of the heater based on the liquid temperature detected by the temperature sensor provided on the heater circuit, the historical pressure value and the current pressure value at the liquid inlet end of the heater, and the historical pressure value and the current pressure value at the liquid outlet end of the heater includes: if the liquid temperature is greater than the overheating standard value, it is determined that the heater has overheated; if the result of predicting overheating of the heater based on the historical pressure value and the current pressure value at the liquid inlet end of the heater, and the historical pressure value and the current pressure value at the liquid outlet end of the heater is that there is a risk of overheating, and the liquid temperature has not reached the overheating standard value, it is determined that the heater has a risk of overheating; if the result of predicting overheating of the heater based on the historical pressure value and the current pressure value at the liquid inlet end of the heater, and the historical pressure value and the current pressure value at the liquid outlet end of the heater is that there is no risk of overheating, the liquid temperature has not reached the overheating standard value, and the absolute value of the difference between the liquid temperature and the overheating standard value is greater than the preset temperature difference threshold, it is determined that the heater has no risk of overheating; if the result of predicting overheating of the heater based on the historical pressure value and the current pressure value at the liquid inlet end of the heater, and the historical pressure value and the current pressure value at the liquid outlet end of the heater is that there is no risk of overheating, the liquid temperature has not reached the overheating standard value, and the absolute value of the difference between the liquid temperature and the overheating standard value is less than or equal to the preset temperature difference threshold, it is determined that the heater has a risk of overheating, and the preset temperature difference threshold is the temperature change amount in the heater circuit per unit time.

[0068] If, within the preset duration from the start of heating of the heater, the absolute value of the current pressure difference is less than or equal to the preset difference threshold, and / or if the absolute values of the pressure differences calculated at a plurality of consecutive moments after the current moment are all less than or equal to the preset difference threshold, it is determined that the heater has a risk of overheating.

[0069] In this embodiment, when the absolute value of the pressure difference between the liquid inlet end and the liquid outlet end of the heater at the current moment is less than or equal to the preset difference threshold within the preset duration from the start of heating of the heater, it indicates that there may be an abnormal liquid flow rate or insufficient liquid volume in the heater circuit. Therefore, it is necessary to further compare the absolute values of the pressure differences calculated at a plurality of moments after the current moment with the preset difference threshold. If the absolute values of the pressure differences at a plurality of moments after the current moment are all less than or equal to the preset difference threshold, it is determined that the heater has a risk of overheating. By comparing the absolute values of the pressure differences at a plurality of consecutive moments with the preset difference threshold, the possible abnormal conditions in the heater circuit are verified, providing the accuracy of the determination result.

[0070] In this embodiment, the number of multiple moments can be set according to actual situations and will not be specifically limited herein. Within the preset duration from when the heater starts heating, if the absolute value of the pressure difference calculated at a certain moment after the current moment is greater than the preset difference threshold and this moment occurs before the end of the multiple moments, it indicates that there is no abnormal situation in the heater circuit and it is predicted that the heater has no over-temperature risk. Compared with detecting whether the heater is in an over-temperature state through a temperature sensor within the preset duration from when the heater starts heating, in the initial stage when the heater starts working in this application, abnormal situations such as abnormal liquid flow rate in the heater circuit or insufficient liquid volume in the circuit can be detected, without having to wait until the liquid temperature in the heater circuit reaches the over-temperature standard value to determine that the heater is in an over-temperature state, which may lead to the heater already being in an over-temperature state and affecting the service life of the heater.

[0071] In this embodiment, the method of detecting whether the heater is in an over-temperature state through a temperature sensor within the preset duration from when the heater starts heating fails to detect in a timely manner the problems of insufficient liquid volume in the heater circuit or poor fluidity of the liquid in the heater circuit, resulting in the heat generated by the heater ceramic sheet not being carried away in time, causing the heater ceramic sheet to work in a high-temperature environment for a long time or the heater ceramic sheet to work for a longer time, thus affecting the life of the heater.

[0072] In an embodiment of this application, before obtaining the historical pressure value and the current moment pressure value at the liquid inlet end of the heater, and the historical pressure value and the current moment pressure value at the liquid outlet end of the heater, the heater over-temperature prediction method includes:

[0073] Collect the pressure values at the liquid inlet end of the heater and the pressure values at the liquid outlet end of the heater according to a preset sampling period.

[0074] In this embodiment, the preset sampling period can be set according to actual situations. For example, the preset sampling period is set to 1 millisecond.

[0075] Calculate the average value of the pressure values at the liquid inlet end of the heater within each preset time period to obtain multiple pressure average values at the liquid inlet end; and calculate the average value of the pressure values at the liquid outlet end of the heater within each preset time period to obtain multiple pressure average values at the liquid outlet end.

[0076] In this embodiment, the preset time period is a multiple of the preset sampling period, and the preset time period can be set according to the actual situation. For example, the duration of the preset time period is set to 0.1 seconds. Assuming that the current moment is recorded as the initial moment of pressure value sampling, the first preset time period is [0, 0.1) seconds, the second preset time period is [0.1, 0.2) seconds, etc. Taking the preset sampling period set to 1 millisecond as an example, within each preset time period, the number of pressure values sampled at the liquid inlet end of the heater is 100. Each pressure average value at the liquid inlet end is the average value of 100 pressure values within the corresponding preset time period.

[0077] Sort the multiple preset time periods in chronological order, and take the average pressure value at the liquid inlet end corresponding to the last sorted preset time period as the current moment pressure value at the liquid inlet end, and take the average pressure values at the liquid inlet end corresponding to the preset time periods in other sorted positions as the historical pressure values at the liquid inlet end; take the average pressure value at the liquid outlet end corresponding to the last sorted preset time period as the current moment pressure value at the liquid outlet end; take the average pressure values at the liquid outlet end corresponding to the preset time periods in other sorted positions as the historical pressure values at the liquid outlet end.

[0078] In this embodiment, by calculating the average value of the pressure values at the liquid inlet end of the heater within each preset time period and the average value of the pressure values at the liquid outlet end of the heater within each preset time period, the fluctuation trend of the pressure values at the liquid inlet end and the fluctuation trend of the pressure values at the liquid outlet end are reduced, and the average level of the pressure values at the liquid inlet end and the average level of the pressure values at the liquid outlet end can be better reflected.

[0079] In an embodiment of the present application, before collecting the pressure values at the liquid inlet end of the heater and the pressure values at the liquid outlet end of the heater according to the preset sampling period, the heater over-temperature prediction method includes:

[0080] Monitor the working state signals of the first pressure sensor and the second pressure sensor.

[0081] In this embodiment, the first pressure sensor is installed on the liquid inlet pipeline of the heater; the second pressure sensor is installed on the liquid outlet pipeline of the heater; the working state signals include normal state signals and abnormal state signals; the abnormal state signals include short-circuit signals and open-circuit signals, etc.

[0082] In this embodiment, the first pressure sensor can be installed at the liquid inlet of the liquid inlet pipeline of the heater, or can be installed at a position with a preset distance threshold from the liquid inlet of the liquid inlet pipeline of the heater. The second pressure sensor can be installed at the liquid outlet of the liquid outlet pipeline of the heater, or can be installed at a position with a preset distance threshold from the liquid outlet of the liquid outlet pipeline of the heater. The preset distance threshold can be set according to the actual situation.

[0083] If the working state signal of the first pressure sensor is an abnormal state signal, and / or the working state signal of the second pressure sensor is an abnormal state signal, it is determined that the water circuit is abnormal, a water circuit fault is reported, and the response to the work request is rejected.

[0084] In this embodiment, after determining that the water circuit is abnormal, the working state signals of the first pressure sensor and the second pressure sensor are continuously monitored until the working state signal of the first pressure sensor is a normal state signal and the working state signal of the second pressure sensor is a normal state signal, and then the monitoring is aborted. The method of monitoring the working state signals of the first pressure sensor and the second pressure sensor can be a real-time monitoring method or a periodic monitoring method, which is not specifically limited herein.

[0085] If the working state signal of the first pressure sensor is a normal state signal and the working state signal of the second pressure sensor is a normal state signal, control the first pressure sensor to collect the pressure value and control the second pressure sensor to collect the pressure value.

[0086] In this embodiment, by monitoring the working state signals of the first pressure sensor and the second pressure sensor, the working state signals of the first pressure sensor and the second pressure sensor can be obtained in a timely manner at the initial stage when the heater starts to work, and when the working state signal of the first pressure sensor is a normal state signal and the working state signal of the second pressure sensor is a normal state signal, the first pressure sensor and the second pressure sensor can be controlled in a timely manner to collect the pressure value.

[0087] In an embodiment of the present application, after obtaining the first corrected pressure value and the second corrected pressure value, the heater over-temperature prediction method includes:

[0088] Store the first corrected pressure value and the second corrected pressure value, send the first corrected pressure value and the second corrected pressure value to the server or the control terminal, and start the process of calculating the current moment pressure difference after receiving the over-temperature prediction instruction from the server or the control terminal.

[0089] In this embodiment, the server can be a cloud server or a background controller remotely connected to the heater, and the control terminal can be a mobile terminal or a laptop computer installed with heater control software remotely connected to the heater.

[0090] Figure 3 It is a flowchart of the heater over-temperature prediction method shown in another exemplary embodiment of the present application, as Figure 3As shown, the process of the over-temperature prediction method for the heater includes: (1) Install a pressure sensor at the inlet and outlet of the heater respectively. After the heater is powered on and awakened, determine whether both pressure sensors are normal. If at least one sensor fails, the heater reports the fault to the server or control terminal and stops working. If both pressure sensors are normal, control the two pressure sensors to collect pressure values every 1 millisecond, calculate the average value of the inlet pressure value collected at the current moment and the 99 inlet pressure values collected before the current moment as the current moment pressure value of the inlet, and calculate the average value of the outlet pressure value collected at the current moment and the 99 outlet pressure values collected before the current moment as the current moment pressure value of the outlet; Determine the inlet pressure range according to the previous moment pressure value of the inlet and the preset pressure change amount, and correct the current moment pressure value of the inlet based on the inlet pressure range to obtain the first corrected pressure value; Determine the outlet pressure range according to the previous moment pressure value of the outlet and the preset pressure change amount, and correct the current moment pressure value of the outlet based on the outlet pressure range to obtain the second corrected pressure value; And report the first corrected pressure value and the second corrected pressure value to the server or control terminal; Determine whether the heater receives an over-temperature prediction instruction from the server or control terminal. If the heater does not receive an over-temperature prediction instruction from the server or control terminal, the heater maintains the prediction waiting state; If the heater receives an over-temperature prediction instruction from the server or control terminal, calculate the pressure difference between the first corrected pressure value and the second corrected pressure value, record it as the current moment pressure difference, and compare the absolute value of the current moment pressure difference with the preset difference threshold to perform over-temperature prediction on the heater; If it is determined that the heater has an over-temperature risk, the heater reports the fault to the server or control terminal and stops working; If it is determined that the heater does not have an over-temperature risk, the heater continues to work.

[0091] In this embodiment, within the preset duration after the heater starts heating, based on the comparison result of the absolute value of the current moment pressure difference and the preset difference threshold, over-temperature prediction is performed on the heater (that is, in the initial stage when the heater starts working, it is judged whether there are abnormal situations such as abnormal liquid flow rate or insufficient liquid volume in the heater loop). If there are abnormal situations such as abnormal liquid flow rate or insufficient liquid volume in the heater loop in the initial stage when the heater starts working, the heater will perform self-protection in advance by reporting the fault to the server or control terminal and stopping working, so as to avoid affecting the life of the heater.

[0092] The device embodiments of the present application are introduced below, which can be used to execute the heater over-temperature prediction method in the above embodiments of the present application. For the details not disclosed in the device embodiments of the present application, please refer to the embodiments of the heater over-temperature prediction method above of the present application.

[0093] Figure 4 It is a block diagram of a heater over-temperature prediction device shown in an exemplary embodiment of the present application. This device can be applied to Figure 1 the implementation environment shown, and is specifically configured in the vehicle-mounted controller 102. This device can also be applicable to other exemplary implementation environments and is specifically configured in other devices. This embodiment does not limit the implementation environment applicable to this device.

[0094] As Figure 4 shown, this exemplary heater over-temperature prediction device 400 includes:

[0095] The pressure acquisition module 401 is used to acquire the historical pressure value and the current moment pressure value at the liquid inlet end of the heater, as well as the historical pressure value and the current moment pressure value at the liquid outlet end of the heater;

[0096] The first pressure correction module 402 is used to determine the pressure range at the liquid inlet end according to the historical pressure value at the liquid inlet end and the preset pressure change amount, and based on the pressure range at the liquid inlet end, correct the current moment pressure value at the liquid inlet end to obtain the first corrected pressure value;

[0097] The second pressure correction module 403 is used to determine the pressure range at the liquid outlet end according to the historical pressure value at the liquid outlet end and the preset pressure change amount, and based on the pressure range at the liquid outlet end, correct the current moment pressure value at the liquid outlet end to obtain the second corrected pressure value;

[0098] The state determination module 404 is used to calculate the pressure difference between the first corrected pressure value and the second corrected pressure value, denoted as the current moment pressure difference, and based on the comparison result between the absolute value of the current moment pressure difference and the preset difference threshold, perform over-temperature prediction on the heater.

[0099] In an embodiment of the present application, the historical pressure value at the liquid inlet end includes the pressure value at the liquid inlet end before the current moment. The pressure value before the current moment can be one or multiple, and no specific limitation is made here. The historical pressure value at the liquid outlet end includes the pressure value at the liquid outlet end before the current moment. The pressure value before the current moment can be one or multiple, and no specific limitation is made here.

[0100] In this embodiment, the preset pressure change amount is the change amount of pressure per unit time. The change amount of pressure per unit time needs to be set according to the actual situation, and no specific limitation is made here.

[0101] In this embodiment, by correcting the current moment pressure value at the liquid inlet end through the pressure range at the liquid inlet end, the first corrected pressure value conforms to the pressure change law (that is, the change amount of the current moment pressure value at the liquid inlet end relative to the previous moment pressure value at the liquid inlet end is less than or equal to the preset pressure change amount), thereby improving the accuracy of the pressure data at the liquid inlet end.

[0102] In this embodiment, the pressure value at the current moment at the liquid outlet end is corrected by the pressure range at the liquid outlet end, so that the second corrected pressure value conforms to the pressure change law (that is, the change amount of the pressure value at the current moment at the liquid outlet end relative to the pressure value at the previous moment at the liquid outlet end is less than or equal to the preset pressure change amount), thereby improving the accuracy of the pressure data at the liquid outlet end.

[0103] In this embodiment, the over-temperature prediction of the heater is performed through the historical pressure value and the current moment pressure value at the liquid inlet end of the heater, and the historical pressure value and the current moment pressure value at the liquid outlet end of the heater. The determination result of the over-temperature risk of the heater can be obtained in a timely manner at the initial stage when the heater starts to work, avoiding the problem that the determination result is lagged when determining the over-temperature of the heater by the temperature of the liquid in the circuit, thereby affecting the service life of the heater; and the current moment pressure value at the liquid inlet end is corrected by the pressure range at the liquid inlet end, and the current moment pressure value at the liquid outlet end is corrected by the pressure range at the liquid outlet end, so that the first corrected pressure value and the second corrected pressure value conform to the pressure change law, thereby improving the accuracy of the pressure data at the liquid inlet end and the liquid outlet end, and further improving the accuracy of the over-temperature state determination.

[0104] It should be noted that the heater over-temperature prediction device provided in the above embodiment and the heater over-temperature prediction method provided in the above embodiment belong to the same concept. The specific ways in which each module and unit perform operations have been described in detail in the method embodiment, and will not be repeated here. In practical applications, the heater over-temperature prediction device provided in the above embodiment can, according to needs, allocate the above functions to different functional modules, that is, divide the internal structure of the device into different functional modules to complete all or part of the functions described above, and this will not be limited here either.

[0105] An embodiment of the present application also provides a vehicle-mounted device, including: one or more processors; a storage device for storing one or more programs, and when the one or more programs are executed by the one or more processors, the vehicle-mounted device implements the heater over-temperature prediction method provided in each of the above embodiments.

[0106] An embodiment of the present application also provides a vehicle, and the vehicle includes the heater over-temperature prediction device provided in each of the above embodiments or the vehicle-mounted device provided in each of the above embodiments.

[0107] Figure 5 The structural schematic diagram of the computer system of the vehicle-mounted device suitable for implementing the embodiment of the present application is shown. It should be noted that Figure 5 The shown computer system 500 of the vehicle-mounted device is only an example, and should not bring any limitation to the functions and usage scope of the embodiment of the present application.

[0108] As shown Figure 5 in FIG. 500, a computer system 500 includes a central processing unit (CPU) 501, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 502 or a program loaded from a storage section 508 into a random access memory (RAM) 503, such as executing the method in the above embodiments. In the RAM 503, various programs and data required for system operations are also stored. The CPU 501, ROM 502, and RAM 503 are connected to each other via a bus 504. An input / output (I / O) interface 505 is also connected to the bus 504.

[0109] The following components are connected to the I / O interface 505: an input section 506 including a keyboard, a mouse, etc.; an output section 507 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc. and a speaker, etc.; a storage section 508 including a hard disk, etc.; and a communication section 509 including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication section 509 performs communication processing via a network such as the Internet. A drive 510 is also connected to the I / O interface 505 as needed. A removable medium 511, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 510 as needed so that a computer program read from it can be installed into the storage section 508 as needed.

[0110] Specifically, according to an embodiment of the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a computer program for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via the communication section 509, and / or installed from the removable medium 511. When the computer program is executed by a central processing unit (CPU) 501, various functions defined in the system of the present application are executed.

[0111] It should be noted that the computer-readable medium shown in the embodiments of the present application can be a computer-readable signal medium, a computer-readable medium, or any combination of the two. The computer-readable medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples of the computer-readable medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, the computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable computer program. Such a propagated data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The computer-readable signal medium can also be any computer-readable medium other than the computer-readable medium, which can send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device. The computer program contained on the computer-readable medium can be transmitted by any appropriate medium, including but not limited to: wireless, wired, etc., or any suitable combination of the above.

[0112] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of the present application. Among them, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and the above module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than marked in the accompanying drawings. For example, two consecutive blocks shown may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram or flowchart, and the combination of blocks in the block diagram or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0113] The units involved in the embodiments described in this application can be implemented in software or in hardware, and the described units can also be provided in a processor. Among them, the names of these units do not, in some cases, constitute a limitation on the units themselves.

[0114] Another aspect of this application also provides a computer-readable medium, on which a computer program is stored. When the computer program is executed by a processor of a computer, the computer is caused to execute the heater overtemperature prediction method as described above. The computer-readable medium can be included in the in-vehicle device described in the above embodiments, or can exist alone without being assembled into the in-vehicle device.

[0115] Another aspect of this application also provides a computer program product or a computer program. The computer program product or the computer program includes computer instructions, and the computer instructions are stored in a computer-readable medium. A processor of a computer device reads the computer instructions from the computer-readable medium, and the processor executes the computer instructions, so that the computer device executes the heater overtemperature prediction method provided in the above various embodiments.

[0116] The above embodiments are only used to exemplarily illustrate the principles and effects of this application, rather than to limit this application. Any person familiar with this technology can make modifications or changes to the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in this application should still be covered by the claims of this application.

Claims

1. A method for predicting heater overtemperature, characterized in that: The method comprises: Obtain the historical pressure value and current pressure value of the heater liquid inlet end, as well as the historical pressure value and current pressure value of the heater liquid outlet end; Determine the pressure range of the liquid inlet end according to the historical pressure value of the liquid inlet end and the preset pressure change, and correct the current pressure value of the liquid inlet end based on the pressure range of the liquid inlet end to obtain a first corrected pressure value; Determine a pressure range of the liquid outlet according to the historical pressure value of the liquid outlet and the preset pressure change, and correct the current pressure value of the liquid outlet based on the pressure range of the liquid outlet to obtain a second corrected pressure value; The pressure difference between the first corrected pressure value and the second corrected pressure value is calculated and recorded as the current pressure difference, and based on the comparison result of the absolute value of the current pressure difference with the preset difference threshold, the overtemperature of the heater is predicted.

2. The heater overtemperature prediction method according to claim 1, characterized in that: If the historical pressure value of the liquid inlet end includes the pressure value of the liquid inlet end at the last moment, then according to the historical pressure value of the liquid inlet end and the preset pressure change, the process of determining the pressure range of the liquid inlet end includes: The sum of the pressure value of the liquid inlet end at the last moment and the preset pressure change is used as the upper limit value of the pressure range of the liquid inlet end; The difference between the pressure value of the liquid inlet end at the last moment and the preset pressure change is used as the lower limit value of the pressure range of the liquid inlet end.

3. The heater overtemperature prediction method according to claim 2, characterized in that: Based on the pressure range of the liquid inlet end, the current pressure value of the liquid inlet end is corrected to obtain a first corrected pressure value, which includes: If the current pressure value of the liquid inlet end is within the pressure range of the liquid inlet end, the current pressure value of the liquid inlet end is used as the first corrected pressure value; If the current pressure value of the liquid inlet end is not within the liquid inlet end pressure range, the difference between the current pressure value of the liquid inlet end and the upper limit of the liquid inlet end pressure range is calculated, which is recorded as the first difference; and the difference between the current pressure value of the liquid inlet end and the lower limit of the liquid inlet end pressure range is calculated, which is recorded as the second difference; If the absolute value of the first difference is smaller than the absolute value of the second difference, the upper limit of the pressure range at the liquid inlet end is used as the first corrected pressure value; If the absolute value of the first difference is greater than the absolute value of the second difference, the lower limit of the pressure range at the liquid inlet end is used as the first corrected pressure value.

4. The heater overtemperature prediction method according to any one of claims 1 to 3, characterized in that: Based on the comparison result of the absolute value of the pressure difference at the current moment and the preset difference threshold, the process of predicting the overtemperature of the heater includes: If within the preset time length when the heater starts heating, the absolute value of the pressure difference at the current moment is greater than the preset difference threshold, it is determined that the heater does not have an over-temperature risk, and the historical pressure value of the liquid inlet end at a subsequent moment, the current pressure value of the liquid inlet end, the historical pressure value of the liquid outlet end and the current pressure value of the liquid outlet end are obtained, and based on the historical pressure value of the liquid inlet end at a subsequent moment, the current pressure value of the liquid inlet end, the historical pressure value of the liquid outlet end and the current pressure value of the liquid outlet end, an over-temperature prediction is performed on the heater; If within the preset time period when the heater starts heating, the absolute value of the pressure difference at the current moment is less than or equal to the preset difference threshold, and / or if the absolute values ​​of the pressure difference calculated at multiple consecutive moments after the current moment are all less than or equal to the preset difference threshold, it is determined that the heater is at risk of overheating.

5. The heater overtemperature prediction method according to any one of claims 1 to 3, characterized in that: Before obtaining the historical pressure value and the current pressure value of the liquid inlet of the heater, and the historical pressure value and the current pressure value of the liquid outlet of the heater, the method includes: Collecting the pressure value of the liquid inlet end of the heater and the pressure value of the liquid outlet end of the heater according to a preset sampling period; Calculate the average value of the pressure value at the liquid inlet end of the heater in each preset time period to obtain multiple pressure average values ​​at the liquid inlet end; and calculate the average value of the pressure value at the liquid outlet end of the heater in each preset time period to obtain multiple pressure average values ​​at the liquid outlet end; the preset time period is a multiple of the preset sampling period; The plurality of preset time periods are sorted in chronological order, and the average pressure value of the liquid inlet end corresponding to the last preset time period in the sorting is used as the current pressure value of the liquid inlet end, and the average pressure value of the liquid inlet end corresponding to the preset time periods at other sorting positions is used as the historical pressure value of the liquid inlet end; the average pressure value of the liquid outlet end corresponding to the last preset time period in the sorting is used as the current pressure value of the liquid outlet end; and the average pressure value of the liquid outlet end corresponding to the preset time periods at other sorting positions is used as the historical pressure value of the liquid outlet end.

6. The heater overtemperature prediction method according to claim 5, characterized in that: Before collecting the pressure value of the liquid inlet end of the heater and the pressure value of the liquid outlet end of the heater according to a preset sampling period, the method includes: Monitor the working state signal of the first pressure sensor and the working state signal of the second pressure sensor; the first pressure sensor is installed on the liquid inlet pipe of the heater; the second pressure sensor is installed on the liquid outlet pipe of the heater; the working state signal includes a normal state signal and an abnormal state signal; the abnormal state signal includes a short circuit signal and an open circuit signal; If the working state signal of the first pressure sensor is the abnormal state signal, and / or the working state signal of the second pressure sensor is the abnormal state signal, it is determined that the water circuit is abnormal, a water circuit fault is reported, and the response to the work request is refused; If the working state signal of the first pressure sensor is the normal state signal and the working state signal of the second pressure sensor is the normal state signal, the first pressure sensor is controlled to collect pressure values, and the second pressure sensor is controlled to collect pressure values.

7. The heater overtemperature prediction method according to any one of claims 1 to 3, characterized in that: After obtaining the first corrected pressure value and the second corrected pressure value, the method includes: The first corrected pressure value and the second corrected pressure value are stored, the first corrected pressure value and the second corrected pressure value are sent to a server or a control terminal, and after receiving an overtemperature prediction instruction from the server or the control terminal, the current pressure difference value is calculated.

8. A heater overtemperature prediction device, characterized in that: The device comprises: A pressure acquisition module is used to obtain the historical pressure value and the current pressure value of the liquid inlet end of the heater, as well as the historical pressure value and the current pressure value of the liquid outlet end of the heater; A first pressure correction module, configured to determine a pressure range of the liquid inlet end according to a historical pressure value of the liquid inlet end and a preset pressure change, and to correct a current pressure value of the liquid inlet end based on the pressure range of the liquid inlet end to obtain a first corrected pressure value; a second pressure correction module, configured to determine a pressure range of the liquid outlet according to the historical pressure value of the liquid outlet and the preset pressure change, and to correct the current pressure value of the liquid outlet based on the pressure range of the liquid outlet to obtain a second corrected pressure value; The state determination module is used to calculate the pressure difference between the first corrected pressure value and the second corrected pressure value, record it as the pressure difference at the current moment, and predict the overtemperature of the heater based on the comparison result of the absolute value of the pressure difference at the current moment and the preset difference threshold.

9. A vehicle-mounted device, characterized in that: include: one or more processors; A storage device for storing one or more programs, when the one or more programs are executed by the one or more processors, enables the vehicle-mounted device to implement the heater overtemperature prediction method as described in any one of claims 1 to 7.

10. A vehicle, characterized in that: The vehicle includes the heater overtemperature prediction device according to claim 8 or the vehicle-mounted equipment according to claim 9.

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