Electric drive liquid leakage early warning method and device, electronic equipment and storage medium

Abstract

The invention relates to the technical field of vehicle electric drive, in particular to an electric drive liquid leakage early warning method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining electric drive operation condition data and electric drive cooling liquid actual measurement temperature; obtaining the estimated temperature of the electric-drive cooling liquid based on the electric-drive operation condition data, and calculating the absolute value of the temperature difference between the actually measured temperature of the electric-drive cooling liquid and the estimated temperature of the electric-drive cooling liquid; and in response to the fact that the temperature difference absolute value exceeds a preset temperature threshold value and the duration of the motor torque exceeding a preset torque threshold value exceeds a preset time threshold value, generating an electric drive liquid leakage early warning signal, otherwise, not generating the electric drive liquid leakage early warning signal. The fault diagnosis accuracy can be improved, the false alarm condition is effectively reduced, the false alarm fault generated when large-load operation is performed for a period of time and then small-load operation is performed is avoided, and the early warning result is more reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of electric drives, and particularly to an electric drive leakage warning method, device, electronic device, and storage medium. Background Art

[0002] At present, with the booming development of the new energy vehicle industry in our country, thermal management problems, such as overheating, ignition, etc., have received high attention from customers. Currently, the industry generally takes passive countermeasures after problems occur. Taking the leakage situation as an example, once leakage occurs, it will cause the cooling effect to deteriorate, and then lead to overheating of the electric drive. In severe cases, it may even burn out the electric drive, resulting in power interruption. In terms of leakage detection, there is currently a lack of effective judgment strategies. Summary of the Invention

[0003] The purpose of the present invention is to provide an electric drive leakage warning method, device, electronic device, and storage medium, which can improve the accuracy of fault diagnosis, effectively reduce false alarms, avoid false alarm faults generated when first entering high-load operation for a period of time and then switching to low-load operating conditions, and make the warning result more reliable.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows: In the first aspect, the present invention discloses an electric drive leakage warning method, which includes: Obtain the electric drive operating condition data and the measured temperature of the electric drive coolant; Based on the electric drive operating condition data, obtain the estimated temperature of the electric drive coolant, and calculate the absolute value of the temperature difference between the measured temperature of the electric drive coolant and the estimated temperature of the electric drive coolant; In response to the absolute value of the temperature difference exceeding a preset temperature threshold and the duration of the motor torque exceeding a preset torque threshold exceeding a preset time threshold, generate an electric drive leakage warning signal, otherwise do not generate an electric drive leakage warning signal.

[0005] Further, the electric drive operating condition data includes the motor speed and the motor torque; The obtaining of the estimated temperature of the electric drive coolant based on the electric drive operating condition data includes: Obtain the first relative relationship between the motor speed, the motor torque, and the estimated temperature of the electric drive coolant; Collect the motor speed and the motor torque of the target electric drive, and determine the estimated temperature of the electric drive coolant according to the first relative relationship and the collected motor speed and motor torque.

[0006] Further, the first relative relationship between the motor speed, the motor torque, and the estimated temperature of the electric drive coolant is obtained by looking up a table.

[0007] Further, after obtaining the estimated temperature of the electric drive coolant, the estimated temperature of the electric drive coolant is corrected based on the ambient temperature.

[0008] Further, correcting the estimated temperature of the electric drive coolant based on the ambient temperature includes: obtaining a second relative relationship between the ambient temperature and the correction coefficient; Collect the current ambient temperature, and determine the correction coefficient according to the second relative relationship and the current ambient temperature K ; Based on the calculation formula K · T 估算 correct the estimated temperature of the electric drive coolant T 估算 for correction.

[0009] Further, the correction coefficient is positively correlated with the ambient temperature.

[0010] Further, the second relative relationship between the correction coefficient and the ambient temperature is obtained by looking up a table.

[0011] In a second aspect, the present invention discloses an electric drive leakage warning device, which includes: An acquisition module for acquiring electric drive operating condition data and the measured temperature of the electric drive coolant; A calculation module for obtaining the estimated temperature of the electric drive coolant based on the electric drive operating condition data, and calculating the absolute value of the temperature difference between the measured temperature of the electric drive coolant and the estimated temperature of the electric drive coolant; An execution module for generating an electric drive leakage warning signal in response to the absolute value of the temperature difference exceeding a preset temperature threshold and the duration of the motor torque exceeding a preset torque threshold exceeding a preset time threshold, and not generating an electric drive leakage warning signal otherwise.

[0012] In a third aspect, the present invention discloses a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the above-mentioned electric drive leakage warning method is implemented.

[0013] In a fourth aspect, the present invention discloses a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned electric drive leakage warning method is implemented.

[0014] The present invention has the following unexpected beneficial effects: 1. The present invention can timely detect possible liquid leakage in the electric drive by obtaining the real-time operating condition data of the electric drive and the measured temperature of the coolant, calculating the absolute value of the temperature difference between the measured temperature and the estimated temperature, and making a judgment in combination with the motor torque and the time threshold. Once the warning condition is met, a liquid leakage warning signal is generated, enabling relevant personnel to take measures before more serious failures occur due to liquid leakage in the electric drive, avoiding serious consequences such as burning out the electric drive and power interruption, and ensuring the safe and stable operation of the vehicle.

[0015] 2. The warning method of the present invention can improve the accuracy of fault diagnosis. By comprehensively considering multiple factors such as the absolute value of the temperature difference, the motor torque, and the duration to judge the liquid leakage situation, compared with relying solely on a single index for judgment, the accuracy of fault diagnosis is greatly improved. For example, if only the temperature difference is used for judgment, false alarms may occur due to special operating conditions such as too small motor torque; while the present invention can effectively reduce false alarms through the setting of a preset torque threshold and a preset time threshold, avoiding false alarm failures that occur when the operation first enters a large-load operation for a period of time and then switches to a small-load operating condition, making the warning result more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention.

[0017] Figure 1 The flowchart shows an embodiment of the electric drive liquid leakage warning method provided by an embodiment of the present invention.

[0018] Figure 2 The flowchart shows the determination process of the estimated temperature of the electric drive coolant in the electric drive liquid leakage warning method provided by an embodiment of the present invention.

[0019] Figure 3 The flowchart shows the correction process of the estimated temperature of the electric drive coolant in the electric drive liquid leakage warning method provided by an embodiment of the present invention.

[0020] Figure 4 The structural diagram shows the electric drive liquid leakage warning device provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and 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 invention. It should be understood that the preferred embodiments are only for illustrating the present invention, rather than for limiting the protection scope of the present invention.

[0022] In one embodiment, as shown in Figure 1 the present invention provides an electric drive leakage warning method, which includes: Obtaining the operating condition data of the electric drive and the measured temperature of the electric drive coolant; Based on the operating condition data of the electric drive, obtaining the estimated temperature of the electric drive coolant, and calculating the absolute value of the temperature difference between the measured temperature of the electric drive coolant and the estimated temperature of the electric drive coolant; In response to the absolute value of the temperature difference exceeding the preset temperature threshold and the duration of the motor torque exceeding the preset torque threshold exceeding the preset time threshold, generating an electric drive leakage warning signal, otherwise not generating an electric drive leakage warning signal.

[0023] By obtaining the operating condition data of the electric drive and the measured temperature of the coolant in real time, calculating the absolute value of the temperature difference between the measured temperature and the estimated temperature, and making a judgment in combination with the motor torque and the time threshold, the present invention can timely detect the possible leakage situation of the electric drive. Once the warning conditions are met, a leakage warning signal will be generated, enabling relevant personnel to take measures before the electric drive suffers more serious failures due to leakage, avoiding serious consequences such as burning out the electric drive and power interruption, and ensuring the safe and stable operation of the vehicle.

[0024] The warning method of the present invention can improve the accuracy of fault diagnosis. By comprehensively considering multiple factors such as the absolute value of the temperature difference, the motor torque, and the duration to judge the leakage situation, compared with judging only relying on a single index, the accuracy of fault diagnosis is greatly improved. For example, if only the temperature difference is judged, false alarms may occur due to special working conditions such as too small motor torque; while through the setting of the preset torque threshold and the preset time threshold in the present invention, false alarm situations can be effectively reduced, avoiding false alarm failures that occur when entering a large-load operation for a period of time and then switching to a small-load working condition, making the warning result more reliable.

[0025] The "false alarm failure when entering a large-load operation for a period of time and then switching to a small-load working condition" refers to the situation where due to the working condition conversion, the warning system makes a wrong judgment and issues a leakage fault alarm that actually does not exist.

[0026] When operating under high load, the electric drive is in a high-power output state, generating a large amount of heat. Efficient heat dissipation by the coolant is required, and the coolant temperature will rise to a relatively high level. At this time, both the estimated temperature of the electric drive coolant obtained by looking up the table according to the operating conditions of the electric drive and the measured temperature of the electric drive coolant are relatively high. When switching from high load to low load operation, the heat generated by the electric drive decreases significantly. However, due to a certain lag in the model temperature calculation, at the initial stage of low load operation, the estimated temperature of the electric drive coolant calculated according to the model may still be at a relatively high level. Since the model is obtained by looking up the table based on the operating condition data, when the operating conditions change suddenly, the model cannot immediately and accurately reflect the actual situation. Under low load conditions, the actual measured temperature of the electric drive coolant will drop rapidly, which may lead to the absolute value of the calculated temperature difference being greater than the set warning threshold (such as 30 °C). If there are no other limiting conditions at this time, the system will mistakenly think that a liquid leakage fault has occurred and send out a false warning signal. In the electric drive liquid leakage warning method described in the present invention, warning is carried out only when the absolute value of the temperature difference exceeds the preset temperature threshold and the duration of the motor torque exceeding the preset torque threshold exceeds the preset time threshold, in order to avoid such false alarms caused by the conversion of operating conditions.

[0027] As a preferred embodiment of the present invention, the operating condition data of the electric drive includes the motor speed and the motor torque. Taking the motor speed and the motor torque as the key basis for obtaining the estimated temperature of the electric drive coolant takes into account the internal relationship between these two factors and the coolant temperature. In actual operation, the changes in the motor speed and torque directly affect the heat generation of the electric drive, and thus affect the coolant temperature. By determining the first relative relationship between them to determine the estimated temperature, compared with simple empirical judgment or single-factor estimation, it can more accurately reflect the true temperature trend of the coolant and provide a reliable data basis for subsequent temperature difference calculation and liquid leakage warning.

[0028] See Figure 2 As shown, the obtaining of the estimated temperature of the electric drive coolant based on the operating condition data of the electric drive includes: Obtaining the first relative relationship between the motor speed, the motor torque and the estimated temperature of the electric drive coolant; Collecting the motor speed and the motor torque of the target electric drive, and determining the estimated temperature of the electric drive coolant according to the first relative relationship and the collected motor speed and motor torque.

[0029] An accurate estimated coolant temperature helps improve the reliability of leakage warning. When calculating the absolute value of the temperature difference between the measured coolant temperature and the estimated temperature, if the estimated temperature is more accurate, the calculation result of the temperature difference can more truly reflect whether there is a leakage problem. For example, if the error of the estimated temperature is large, it may lead to incorrect calculation of the temperature difference, resulting in false alarms or missed alarms. This preferred embodiment uses an accurate estimated temperature to reduce this error, making it more reliable when judging whether to generate an electric drive leakage warning signal, reducing unnecessary false alarms, and improving the credibility of the warning system.

[0030] The method of determining the estimated coolant temperature using the motor speed and motor torque has strong adaptability and versatility. For different models and specifications of electric drive systems, although there are differences in specific performance parameters, the basic relationship between the motor speed and torque and the coolant temperature is similar. This estimation method based on the generally existing operating parameters can be conveniently applied to various types of electric drive devices, and can effectively play a role in both the automotive industry and other industrial fields involving electric drives, without the need to redesign complex temperature estimation schemes for each electric drive device.

[0031] From an implementation perspective, the motor speed and motor torque are parameters that are easy to obtain during the operation of the electric drive. In most electric drive systems, corresponding sensors are equipped to monitor these two parameters in real time. This means that when actually applying this preferred embodiment, there is no need to additionally add complex sensors or devices to obtain new data, reducing the difficulty and cost of technical implementation and facilitating promotion and application in existing electric drive systems.

[0032] Furthermore, the first relative relationship between the motor speed, motor torque and the estimated electric drive coolant temperature is obtained by looking up a table.

[0033] In this preferred embodiment, the method of directly looking up a table is used to obtain the first relative relationship between the motor speed, motor torque and the estimated electric drive coolant temperature, avoiding complex formula derivation and real-time calculation. During the actual operation process, the electric drive system needs to respond quickly and obtain the estimated coolant temperature. If a complex calculation method is used, it may occupy a large amount of computing resources and time, resulting in system response delay. The table lookup method can quickly locate the corresponding temperature value, greatly improving the efficiency of data acquisition and ensuring that the warning system can process data in a timely manner and make a judgment.

[0034] The data in the table is usually obtained after a large number of experiments and actual measurements. When creating the table, through precise measurement and statistical analysis of the motor speed, motor torque, and corresponding coolant temperature under different working conditions, the most accurate data is entered into the table. Compared with real-time estimation during operation, this pre-calibrated and verified data can more accurately reflect the actual situation, reduce the estimation deviation caused by calculation errors or model simplification, thereby further improving the accuracy of the estimated temperature of the electric drive coolant and providing more reliable data support for leakage warning.

[0035] When the electric drive system is upgraded or new working conditions occur, the method of obtaining the first relative relationship by looking up the table facilitates data maintenance and update. Only the data in the table needs to be modified or supplemented, rather than making large-scale adjustments to the entire calculation program or algorithm. For example, if it is found that the temperature data under certain special working conditions is inaccurate, or the heat dissipation performance changes due to the replacement of some components in the electric drive system, only the corresponding data in the first relative relationship table needs to be updated, reducing the difficulty and cost of system maintenance and improving the scalability and flexibility of the system.

[0036] Since the calculation logic of the look-up table method is simple and clear, it is not easily affected by external factors and cause calculation errors. In a complex electric drive operating environment, such as in the presence of electromagnetic interference, voltage fluctuations, etc., complex calculation algorithms may malfunction, but the look-up table operation is relatively stable and reliable. This stability helps ensure that the warning system can work properly in various harsh environments, continuously and accurately judge the temperature of the electric drive coolant, and issue leakage warnings in a timely manner to ensure the safe operation of the electric drive system.

[0037] As a preferred embodiment of the present invention, as shown in Figure 3 After obtaining the estimated temperature of the electric drive coolant, the estimated temperature of the electric drive coolant is corrected based on the ambient temperature.

[0038] The ambient temperature has a non-negligible impact on the actual temperature of the electric drive coolant. Under different ambient temperatures, even if the operating conditions of the electric drive (motor speed, motor torque) are the same, the heat dissipation conditions of the coolant will be different. For example, in a high-temperature environment, the speed at which the coolant dissipates heat to the outside slows down, and its actual temperature will be higher than in a low-temperature environment. By correcting the estimated temperature of the electric drive coolant based on the ambient temperature, the influence of environmental factors can be comprehensively considered, making the estimated temperature closer to the actual value. This further improves the accuracy of subsequent temperature difference calculations, provides a more reliable data basis for leakage warning, and reduces the probability of false alarms and missed alarms.

[0039] Considering the correction of the estimated temperature by the ambient temperature helps to optimize the performance of the entire warning system. Accurate temperature correction allows the system to make more reasonable decisions when facing complex and variable operating conditions. For example, when it is detected that the coolant temperature rises abnormally and a leakage risk is judged, the system can reasonably adjust the control strategy for the electric drive according to more accurate temperature data, such as limiting the torque output, which can not only prevent further damage to the hardware, but also maintain the operation of the equipment as much as possible on the premise of ensuring safety, improving the use efficiency and safety of the equipment.

[0040] From the perspective of practical application, the ambient temperature is one of the important factors affecting the operation of the electric drive cooling system. Ignoring the influence of the ambient temperature will cause the warning system to deviate from the actual situation and unable to accurately reflect the true state of the electric drive. This preferred implementation fully considers this actual demand, making the warning system more in line with the actual operation of the electric drive, providing more effective fault warning information for users, and ensuring the stable operation of the electric drive equipment.

[0041] Furthermore, as shown in Figure 3 correcting the estimated temperature of the electric drive coolant based on the ambient temperature includes: obtaining the second relative relationship between the ambient temperature and the correction coefficient; collecting the current ambient temperature, and determining the correction coefficient according to the second relative relationship and the current ambient temperature K ; Based on the calculation formula K · T 估算 correct the estimated temperature of the electric drive coolant T 估算 for correction.

[0042] In this preferred implementation, by obtaining the second relative relationship between the ambient temperature and the correction coefficient, and determining the correction coefficient according to the collected current ambient temperature K , this method can accurately adjust the estimated temperature of the electric drive coolant according to the actual ambient temperature. Since different ambient temperatures have different degrees of influence on the heat dissipation and temperature rise of the coolant, using specific correction coefficients can more precisely reflect these differences. For example, in a high-temperature environment, the correction coefficient will adjust the estimated temperature upward to more accurately reflect the actual temperature that the coolant may reach; in a low-temperature environment, it will be adjusted downward accordingly, so that the finally obtained corrected temperature is closer to the true value, greatly improving the accuracy of temperature estimation.

[0043] Accurate temperature correction can significantly improve the reliability of the electric drive leakage warning. Because more accurate estimation of the coolant temperature can make the absolute value of the temperature difference between the measured coolant temperature and the estimated coolant temperature calculated more truly reflect whether there is leakage in the electric drive. When the calculation of the absolute value of the temperature difference is more accurate, the leakage warning signal issued by the system based on the absolute value of the temperature difference and other conditions (such as motor torque, time threshold) is more reliable, reducing false alarms caused by inaccurate temperature estimation, providing stronger guarantee for the safe operation of the equipment, and avoiding unnecessary troubles and economic losses to users caused by false warnings.

[0044] Furthermore, the correction coefficient is positively correlated with the ambient temperature.

[0045] From a physical perspective, when the ambient temperature rises, the heat dissipation difficulty of the electric drive coolant increases. Under the same operating conditions of the electric drive, the actual temperature of the coolant will rise. The positive correlation between the correction coefficient and the ambient temperature means that the higher the ambient temperature, the larger the correction coefficient, and the greater the increase in the estimated temperature of the electric drive coolant, and vice versa. This setting highly conforms to the actual physical law of heat exchange, can accurately correct the estimated temperature, make the estimated value closer to the true temperature of the coolant in the current environment, and thus provide more reliable data support for subsequent leakage judgment based on the temperature difference.

[0046] As the ambient temperature changes in real time, the correction coefficient will also change accordingly, and then timely adjust the estimated temperature of the electric drive coolant. This enables the warning system to quickly respond to environmental changes and always maintain accurate monitoring of the electric drive leakage situation. For example, during vehicle driving, when driving from a shaded area into a sunlit area, the ambient temperature rises rapidly, and the correction coefficient immediately increases to timely correct the estimated temperature, ensuring that the system can make a correct leakage judgment based on the latest temperature data, improving the dynamic monitoring performance of the system, and ensuring the safe operation of the electric drive in various dynamic environments.

[0047] Furthermore, the second relative relationship between the correction coefficient and the ambient temperature is obtained by looking up a table.

[0048] By looking up the table, the correction coefficient corresponding to the current ambient temperature can be quickly obtained, avoiding complex calculation processes. During the real-time operation of the electric drive system, time and computing resources are very precious. If other complex calculation methods are used to determine the correction coefficient, it may lead to system response delays and affect the timeliness of leakage warnings. However, the table lookup operation can be completed in an extremely short time, ensuring that the corrected estimated coolant temperature can be timely used for leakage judgment, improving the real-time performance and response speed of the warning system.

[0049] The data in the second relative relationship table is collected and collated through extensive experiments, testing, and actual operating data. During the development of this second relative relationship table, the correction coefficients at different ambient temperatures were precisely measured and verified. Compared to real-time calculation methods, this reduces uncertainty caused by factors such as computational errors and model simplifications. This accuracy makes the correction coefficients more reliable, thereby ensuring the accuracy of the corrected e-drive coolant temperature estimate. This provides reliable and accurate data support for leak warnings, reducing the risk of false alarms and missed alerts.

[0050] When adjusting or optimizing the relationship between the correction coefficient and ambient temperature, the table lookup approach offers significant advantages. Simply modifying, supplementing, or updating the data in the second relative relationship table is sufficient, eliminating the need for extensive changes to the entire correction algorithm or program. For example, if the heat dissipation performance of an electric drive system changes with upgrades, simply re-measuring and updating the corresponding correction coefficient data in the table can quickly adapt to the new system characteristics, reducing the difficulty and cost of system maintenance and improving system scalability and flexibility.

[0051] The table lookup method for obtaining the second relative relationship is highly versatile. Regardless of the type of electric drive system, as long as the corresponding relationship between ambient temperature and correction coefficient is determined and tabulated, this method can be applied to perform temperature correction. It is also easy to integrate with other existing monitoring and control systems without requiring major adjustments to the existing system architecture. It is highly compatible with electric drive equipment from different manufacturers, facilitating its application across the industry and promoting the widespread adoption of electric drive leakage warning technology.

[0052] In one embodiment, the present invention also discloses an electric drive leakage warning device, see Figure 4 As shown, the early warning device 10 includes an acquisition module 11, a calculation module 12 and an execution module 13. The acquisition module 11 is used to obtain electric drive operating condition data and the actual measured temperature of the electric drive coolant; the calculation module 12 is used to obtain the estimated temperature of the electric drive coolant based on the electric drive operating condition data, and calculate the absolute value of the temperature difference between the actual measured temperature of the electric drive coolant and the estimated temperature of the electric drive coolant; the execution module 13 is used to generate an electric drive leakage early warning signal in response to the absolute value of the temperature difference exceeding a preset temperature threshold and the duration of the motor torque exceeding the preset torque threshold exceeding a preset time threshold, and otherwise no electric drive leakage early warning signal is generated.

[0053] As a preferred embodiment of the present invention, the calculation module 12 further includes a correction unit, which is used to correct the estimated temperature of the electric drive coolant based on the ambient temperature after obtaining the estimated temperature of the electric drive coolant.

[0054] In one embodiment, the present invention also discloses a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the above-mentioned electric drive leakage warning method is implemented.

[0055] In one embodiment, the present invention also discloses a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned electric drive leakage warning method is implemented.

[0056] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the above-mentioned method embodiments. Among them, any reference to a memory, storage, database, or other medium used in the various embodiments provided in the present application can include non-volatile and / or volatile memories. Non-volatile memories can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memories can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0057] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0058] The above embodiments are only preferred embodiments given to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention.

Claims

1. An electric drive leakage warning method, characterized in that, including: Obtain the operating condition data of the electric drive and the measured temperature of the electric drive coolant; Based on the operating condition data of the electric drive, obtain the estimated temperature of the electric drive coolant, and calculate the absolute value of the temperature difference between the measured temperature of the electric drive coolant and the estimated temperature of the electric drive coolant; In response to the absolute value of the temperature difference exceeding the preset temperature threshold and the duration of the motor torque exceeding the preset torque threshold exceeding the preset time threshold, generate an electric drive liquid leakage warning signal, otherwise do not generate an electric drive liquid leakage warning signal.

2. The electric drive leakage warning method according to claim 1, wherein: The operating condition data of the electric drive includes the motor speed and the motor torque; The obtaining the estimated temperature of the electric drive coolant based on the operating condition data of the electric drive includes: Obtain the first relative relationship between the motor speed, the motor torque and the estimated temperature of the electric drive coolant; Collect the motor speed and the motor torque of the target electric drive, and determine the estimated temperature of the electric drive coolant according to the first relative relationship and the collected motor speed and motor torque.

3. The electric drive leakage warning method according to claim 2, wherein: The first relative relationship between the motor speed, the motor torque and the estimated temperature of the electric drive coolant is obtained by looking up a table.

4. The electric drive leakage warning method according to claim 1, wherein: After obtaining the estimated temperature of the electric drive coolant, correct the estimated temperature of the electric drive coolant based on the ambient temperature.

5. The electric drive leakage warning method according to claim 4, wherein Correcting the estimated temperature of the electric drive coolant based on the ambient temperature includes: obtaining the second relative relationship between the ambient temperature and the correction coefficient; Collect the current ambient temperature, and determine a correction factor based on the second relative relationship and the current ambient temperature K ; Based on the calculation formula K · T 估算 correct the estimated temperature of the electric drive coolant T 估算 Perform correction 6. The electric drive leakage warning method according to claim 5, wherein: The correction coefficient is positively correlated with the ambient temperature.

7. The electric drive leakage warning method according to claim 5, wherein: The second relative relationship between the correction coefficient and the ambient temperature is obtained by looking up a table.

8. An electric drive liquid leakage warning device, characterized in that, including: An obtaining module, configured to obtain the operating condition data of the electric drive and the measured temperature of the electric drive coolant; A calculation module, configured to obtain the estimated temperature of the electric drive coolant based on the operating condition data of the electric drive, and calculate the absolute value of the temperature difference between the measured temperature of the electric drive coolant and the estimated temperature of the electric drive coolant; An execution module, configured to generate an electric drive liquid leakage warning signal in response to the absolute value of the temperature difference exceeding the preset temperature threshold and the duration of the motor torque exceeding the preset torque threshold exceeding the preset time threshold, otherwise do not generate an electric drive liquid leakage warning signal.

9. A computer device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the electric drive liquid leakage warning method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the electric drive liquid leakage warning method according to any one of claims 1 to 7.

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