Heating control method, device and equipment for lubricating oil and storage medium

Abstract

The invention discloses a heating control method and device for lubricating oil, equipment and a storage medium. When the method provided by the embodiment of the invention is executed, firstly, the controller can obtain the temperature of the lubricating oil in real time so as to monitor the current state of the lubricating oil; and when it is detected that the temperature of the lubricating oil is lower than or equal to a set first temperature threshold value, a duty ratio signal used for controlling the target motor is calculated. Next, a high-frequency pulse voltage vector is generated using the acquired duty cycle signal, and is injected into the winding of the target motor. And in the process, the motor winding generates large-amplitude alternating current, so that the lubricating oil is effectively heated. The heating efficiency and speed of the lubricating oil are improved, and damage to vehicle equipment is reduced.

Description

Technical Field

[0001] This application relates to the field of vehicle engineering technology, specifically to a method, apparatus, equipment, and storage medium for heating lubricating oil. Background Technology

[0002] In frigid environments, the viscosity of the lubricating oil in the oil-cooled electric drive axle of heavy-duty trucks increases dramatically. This causes the electric oil pump, which provides cooling and lubrication, to face enormous starting resistance torque, making it difficult to start normally. This situation severely impacts the overall performance and reliability of the vehicle. To address this problem, a common approach is to heat the lubricating oil by generating heat from the motor in a DC stall state. However, this method is inefficient, heats up slowly, and can damage vehicle equipment (such as the motor, power switching devices, battery pack, and drive unit), further affecting its operational capability and lifespan.

[0003] Therefore, how to improve the heating efficiency and speed of lubricating oil and reduce damage to vehicle equipment is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of the above problems, this application provides a heating control method, device, equipment and storage medium for lubricating oil, which can improve the efficiency and speed of lubricating oil heating, reduce damage to equipment and ensure rapid start-up of electronic oil pump.

[0005] The embodiments of this application disclose the following technical solutions: A method for controlling the heating of lubricating oil, applied to a controller, the method comprising: To obtain the oil temperature of the lubricating oil in the oil-cooled electric drive axle of a heavy-duty truck; If the oil temperature is less than or equal to the first temperature threshold, then the duty cycle signal for controlling the target motor is calculated; the target motor is the electronic oil pump drive motor of the heavy truck oil-cooled electric drive bridge. A high-frequency pulse voltage vector is generated based on the duty cycle signal; The high-frequency pulse voltage vector is injected into the windings of the target motor to generate a large-amplitude alternating current in the windings, thereby heating the lubricating oil.

[0006] In one possible implementation, generating the high-frequency pulse voltage vector based on the duty cycle signal includes: Analyze the power demand corresponding to the duty cycle signal; Based on the power requirement, the basic waveform of the high-frequency pulse voltage vector is determined; The high-frequency pulse voltage is obtained by setting the amplitude and frequency corresponding to the duty cycle signal to the amplitude and frequency of the basic waveform.

[0007] In one possible implementation, the method further includes: Real-time monitoring of the winding temperature; When the temperature of the winding is greater than or equal to the second temperature threshold, the amplitude and frequency of the high-frequency pulse voltage vector are reduced to obtain a new high-frequency pulse voltage vector, so as to re-inject the latest high-frequency pulse voltage vector into the winding.

[0008] In one possible implementation, When the amplitude of the high-frequency pulse voltage vector is reduced for the first time, both the amplitude and frequency of the high-frequency pulse voltage vector are reduced by 80% to obtain the first derating voltage vector; When the amplitude of the high-frequency pulse voltage vector is reduced for the second time, the amplitude and frequency of the first derating voltage vector are both reduced by 60% to obtain the second derating voltage vector. When the amplitude of the high-frequency pulse voltage vector is reduced three times, the amplitude and frequency of the second derating voltage vector are both reduced by 40% to obtain the third derating voltage vector. When the amplitude and frequency of the high-frequency pulse voltage vector are reduced four times, the amplitude and frequency of the third derating voltage vector are both reduced by 20% to obtain the fourth derating voltage vector. If the temperature of the winding is still greater than or equal to the second temperature threshold after the amplitude and frequency of the high-frequency pulse voltage vector are reduced four times, then the high-frequency pulse voltage vector is set to 0 to stop heating.

[0009] In one possible implementation, after injecting the high-frequency pulse voltage vector into the windings of the target motor to generate a large-amplitude alternating current in the windings, thereby heating the lubricating oil, the method further includes: Based on the injected high-frequency pulse voltage vector and feedback current signal, the equivalent load torque of the target motor is estimated using the Extended Kalman Filter (EKF) sensorless observer algorithm; the feedback current signal is the real-time current signal of the target motor. When the equivalent load torque is less than the rated torque, it is determined that the starting conditions of the target motor are met, and the high-frequency pulse voltage vector is set to 0 to stop heating; When the equivalent load torque is greater than or equal to the rated torque, it is determined that the starting conditions of the target motor are not met. The amplitude and frequency parameters of the high-frequency pulse voltage vector are increased to obtain a new high-frequency pulse voltage vector. The pulse injection and equivalent load torque estimation steps are repeated using the latest high-frequency pulse voltage vector until the starting conditions of the target motor are met.

[0010] A heating control device for lubricating oil, the device comprising: The oil temperature acquisition unit is used to acquire the oil temperature of the lubricating oil in the oil-cooled electric drive axle of heavy-duty trucks; The duty cycle acquisition unit is used to calculate the duty cycle signal for controlling the target motor if the oil temperature is less than or equal to a first temperature threshold; the target motor is the electronic oil pump drive motor of the heavy truck oil-cooled electric drive bridge. A voltage vector generation unit is used to generate a high-frequency pulse voltage vector based on the duty cycle signal; An injection unit is used to inject the high-frequency pulse voltage vector into the windings of the target motor to generate a large-value alternating current in the windings, thereby heating the lubricating oil.

[0011] In one possible implementation, the voltage vector generation unit is specifically used for: Analyze the power demand corresponding to the duty cycle signal; Based on the power requirement, the basic waveform of the high-frequency pulse voltage vector is determined; The high-frequency pulse voltage is obtained by setting the amplitude and frequency corresponding to the duty cycle signal to the amplitude and frequency of the basic waveform.

[0012] In one possible implementation, the device further includes: Temperature monitoring unit, used to monitor the temperature of the winding in real time; An adjustment unit is used to reduce the amplitude and frequency of the high-frequency pulse voltage vector to obtain a new high-frequency pulse voltage vector when the temperature of the winding is greater than or equal to a second temperature threshold, so as to re-inject the latest high-frequency pulse voltage vector into the winding.

[0013] A heating control device for lubricating oil includes: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the heating control method for lubricating oil as described above.

[0014] A computer-readable storage medium storing instructions that, when executed on a terminal device, cause the terminal device to perform the lubricating oil heating control method as described above.

[0015] Compared with the prior art, this application has the following beneficial effects: This application provides a method, apparatus, device, and storage medium for heating control of lubricating oil. Specifically, when implementing the lubricating oil heating control method provided in this application, real-time oil temperature data of the lubricating oil can first be collected as the core judgment basis for low-temperature heating start-up. When the oil temperature is detected to drop to or below a first temperature threshold, the duty cycle signal for controlling the target motor (i.e., the electronic oil pump drive motor of the heavy-duty truck oil-cooled electric drive bridge) is calculated. This signal can dynamically reflect the heating power demand under different operating conditions. Subsequently, a high-frequency pulse voltage vector is generated based on the duty cycle signal. Finally, the high-frequency pulse voltage vector is injected into the winding of the electronic oil pump drive motor, causing the winding to generate a large-value alternating current. By utilizing the Joule effect of the alternating current and the eddy current loss of the iron core, efficient and uniform heat release is achieved, rapidly increasing the oil temperature of the lubricating oil to reduce its viscosity. This application obtains the temperature of the lubricating oil in the heavy-duty truck oil-cooled electric drive bridge in real time and triggers targeted heating logic based on this, using the duty cycle signal to generate a high-frequency pulse voltage vector, which is injected into the winding of the electronic oil pump drive motor, thereby generating a large-value alternating current. This method not only utilizes the Joule effect of current to achieve efficient heating, but also improves heat conversion efficiency by linking the eddy current loss of the iron core, effectively solving the problems of heat concentration and slow transfer in traditional heating methods, and significantly improving heating efficiency. Simultaneously, the high-frequency pulse characteristics ensure uniform heat distribution, reducing the risk of localized overheating and avoiding prolonged DC stall, thereby reducing the impact on power devices, batteries, and motor drivers, and extending equipment lifespan. Furthermore, the dynamic adaptability of the duty cycle signal allows for flexible adjustment of the amplitude and frequency of the high-frequency pulse voltage vector, quickly meeting the characteristics of large oil volume and high heat capacity of the heavy-duty truck oil-cooled electric drive bridge, shortening preheating time, and ensuring rapid start-up of the electronic oil pump in extremely cold environments. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this embodiment or the prior art, the drawings used in the description of the embodiment or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A flowchart illustrating a method for controlling the heating of lubricating oil, as provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a heating control device for lubricating oil provided in an embodiment of this application. Detailed Implementation

[0018] To facilitate understanding of the technical solutions provided in the embodiments of this application, the background technology involved in the embodiments of this application will be described below.

[0019] In frigid environments, the viscosity of the lubricating oil inside the oil-cooled electric drive axle of heavy-duty trucks rises sharply due to low temperatures. This causes the electronic oil pump, which provides cooling and lubrication for the axle, to face significant starting resistance torque, making normal starting difficult. Currently, a common industry solution is "self-stalling heating," where the motor is in a DC stall state, using its own heat to heat the oil. However, this method has significant drawbacks: low heating efficiency, heat concentrated in the stator windings, slow heat transfer to the oil, and a tendency to cause localized overheating; the heating speed is insufficient for demanding applications, especially for heavy-duty truck electric drive axles with large oil volumes and heat capacities, resulting in excessively long preheating times, making it unsuitable for rapid start-up scenarios. Furthermore, prolonged DC stall conditions place a significant burden on power devices and batteries, causing considerable stress on the motor and drive unit, potentially damaging the stator windings of the electronic oil pump drive motor, power switching devices, battery pack, and the core components of the drive unit.

[0020] To address this issue, this application provides a method, apparatus, device, and storage medium for heating and controlling lubricating oil. First, the lubricating oil temperature is acquired in real time. This step is crucial for ensuring the lubricating oil maintains appropriate fluidity. If the detected oil temperature is less than or equal to a first temperature threshold, a heating mechanism is activated. At this point, a duty cycle signal for controlling the target motor can be calculated. Here, the target motor refers to the motor used to drive the electronic oil pump. Next, a high-frequency pulse voltage vector is generated based on the acquired duty cycle signal. This voltage vector can generate a large-amplitude alternating current. The generated high-frequency pulse voltage vector is then injected into the motor windings, causing the windings to generate a large-amplitude alternating current. In this way, the lubricating oil can be effectively heated, increasing its temperature and thus reducing its viscosity, ensuring the normal start-up and operation of the electronic oil pump in low-temperature environments. This application, by generating a large-amplitude alternating current in the motor windings, can heat the lubricating oil more evenly, avoiding heat concentration in specific areas. Simultaneously, the use of a high-frequency pulse voltage vector reduces the burden on power devices and batteries caused by prolonged DC stall, lowering the impact on the motor and driver. In addition, this application can rapidly increase the temperature of the lubricating oil, shorten the preheating time, and ensure that the electronic oil pump can start quickly, thereby meeting the requirements for rapid start-up.

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] See Figure 1The figure is a flowchart of a method for controlling the heating of lubricating oil according to an embodiment of this application. Figure 1 As shown, the heating control method for the lubricating oil may include steps S101-S104: S101: Obtain the oil temperature of the lubricating oil in the oil-cooled electric drive axle of a heavy-duty truck.

[0023] To ensure smooth start-up and operation of the electric drive axle under various environmental conditions, the controller first monitors the lubricating oil temperature in real time. The temperature of the lubricating oil directly affects its viscosity and fluidity; at low temperatures, the lubricating oil may become too thick, increasing the risk of wear on the motor and other mechanical components, and even causing the equipment to malfunction. Therefore, high-precision sensors can acquire real-time lubricating oil temperature data to promptly assess the status of the lubrication system.

[0024] S102: If the oil temperature is less than or equal to the first temperature threshold, calculate the duty cycle signal used to control the target motor.

[0025] To achieve precise low-temperature start control of the heavy-duty truck oil-cooled electric drive axle electronic oil pump in frigid environments, after completing the lubricating oil temperature acquisition, the controller can trigger a mode based on a preset threshold: when the monitored oil temperature is less than or equal to the first temperature threshold (this threshold is selected as needed within the range of -10~20℃ to adapt to the start requirements of different frigid environments), the system determines that the electronic oil pump is facing low-temperature start resistance, and then starts the pulse active heating control logic to synchronously and directionally acquire the duty cycle signal of the target motor.

[0026] The target motor refers to the electronic oil pump drive motor that provides cooling and lubrication for the oil-cooled electric drive bridge, and is the core actuator for achieving oil heating. The calculated duty cycle signal is essentially a pulse width modulation (PWM) signal used to precisely control the motor's operating speed and output torque. It transmits different heating power demand commands by dynamically adjusting the high-level duty cycle, providing a core basis for the subsequent parameter optimization configuration of the high-frequency pulse voltage vector. This ensures that the heating power is precisely matched with the current low-temperature operating conditions, avoiding both insufficient power leading to heating inefficiency and excessive power causing equipment damage.

[0027] S103: Generate a high-frequency pulse voltage vector based on the duty cycle signal.

[0028] To achieve efficient and precise heating of lubricating oil, the controller can generate a suitable high-frequency pulse voltage vector based on the duty cycle signal. First, it analyzes the heating power requirement mapped by the duty cycle signal. Combining this with the large oil volume and high heat capacity characteristics of the heavy-duty truck oil-cooled electric drive bridge, it selects the optimal base waveform from sine waves, square waves, or space vector pulses. Then, it dynamically adjusts the amplitude and frequency of the waveform according to the duty cycle, while simultaneously optimizing the magnetic field coupling efficiency through a phase calibration algorithm. This ensures that the frequency of the generated high-frequency pulse voltage vector is much higher than the fundamental frequency of the electronic oil pump drive motor, thereby enabling the motor windings to generate a large-amplitude alternating current to meet the heating requirements.

[0029] S104: Inject the high-frequency pulse voltage vector into the winding of the target motor to generate a large-scale alternating current in the winding, thereby heating the lubricating oil.

[0030] Finally, the controller injects the generated high-frequency pulse voltage vector into the windings of the electronic oil pump drive motor of the heavy-duty truck's oil-cooled electric drive bridge. The frequency of this voltage vector is much higher than the motor's fundamental frequency, thus forcing a large-scale alternating current to form inside the windings while ensuring the motor rotor remains stationary. As the alternating current flows through the windings, it releases a large amount of heat through the Joule effect, simultaneously causing eddy current losses in the motor core and generating heat. This dual heating mechanism ensures that heat is evenly distributed between the windings and the core, preventing localized overheating. The heat generated by the motor windings is quickly transferred to the surrounding lubricating oil, resulting in a rapid increase in oil temperature and effectively reducing the viscosity of the lubricating oil.

[0031] Based on the content of S101-S104, the oil temperature of the lubricating oil in the oil-cooled electric drive axle of the heavy-duty truck is first obtained. If the oil temperature is less than or equal to a first temperature threshold, the duty cycle signal used to control the target motor is calculated. Next, a high-frequency pulse voltage vector is generated based on the duty cycle signal. Finally, the high-frequency pulse voltage vector is injected into the windings of the target motor to generate a large-amplitude alternating current in the windings, thereby heating the lubricating oil. This application significantly improves heating efficiency and vehicle equipment reliability.

[0032] In one possible implementation, the specific process of generating a high-frequency pulse voltage vector based on the duty cycle signal includes: First, the acquired PWM duty cycle signal is decoded and analyzed. Combining the large oil volume and high heat capacity characteristics of the heavy-duty truck oil-cooled electric drive bridge with real-time monitoring of bus current and ambient temperature data, the required heating power under the current low-temperature operating conditions is derived in reverse, providing a core basis for subsequent voltage vector parameter design. Then, based on the analyzed power requirement, the optimal base waveform is selected from a preset waveform library (including sine waves, square waves, and space vector pulses). For example, square waves with higher energy density are prioritized for high power requirements, while sine waves are used when heating uniformity is desired, ensuring that waveform characteristics match the power requirement. Finally, the amplitude parameter (reflecting power output intensity) and frequency parameter (ensuring rotor stationary and generating a large-amplitude alternating current) mapped by the duty cycle signal are precisely assigned to the selected base waveform. A complete high-frequency pulse voltage vector is generated through a waveform synthesis algorithm, satisfying both the requirement of maximizing heating efficiency and avoiding equipment damage caused by excessive power.

[0033] In one possible implementation, the method further includes a winding temperature closed-loop protection process to prevent damage to the motor and power devices due to localized overheating during the heating process: A temperature sensing element integrated into the stator winding of the electronic oil pump drive motor is used to collect the winding's operating temperature data in real time. This sensing element has a fast response characteristic and can accurately detect abnormal operating conditions such as sudden temperature rises. Temperature signals are continuously received and analyzed. When the winding temperature is detected to be greater than or equal to a preset second temperature threshold (e.g., 120°C, adapted to the motor's heat resistance limit design), power derating control logic is immediately triggered.

[0034] The derating control logic works as follows: The amplitude and frequency of the high-frequency pulse voltage vector are reduced to generate a new high-frequency pulse voltage vector adapted to the current temperature conditions, ensuring that the heating power dynamically decreases with temperature changes and preventing continuous heat accumulation. The adjusted new high-frequency pulse voltage vector is then re-injected into the windings, effectively controlling the winding temperature within a safe range while maintaining basic heating functionality, thus balancing heating efficiency and equipment operational safety.

[0035] In one possible implementation, to achieve precise, graded protection of winding temperature and prevent equipment damage due to overheating during heating, a stepped derating control strategy is adopted: When the winding temperature is detected to reach or exceed the second temperature threshold (e.g., 120°C) for the first time, a first-level derating is immediately triggered, reducing the amplitude and frequency of the current high-frequency pulse voltage vector by 80% to generate an appropriate first derating voltage vector, which is continuously injected into the winding; if the winding temperature does not drop after derating, it remains at or above the second temperature threshold, triggering a second-level derating, further reducing the amplitude and frequency of the first derating voltage vector by 60% to generate a second derating voltage vector; if the temperature still does not meet the standard after second-level derating, a third-level derating is executed, reducing the amplitude and frequency of the second derating voltage vector by 40% to generate a third derating voltage vector; if the high temperature condition is still not alleviated after third-level derating, a fourth-level derating is initiated, further reducing the amplitude and frequency of the third derating voltage vector by 20% to generate a fourth derating voltage vector.

[0036] If the winding temperature is still greater than or equal to the second temperature threshold after four step-by-step derating adjustments, it indicates that the current operating condition has exceeded the safe heating range. The high-frequency pulse voltage vector can be set to 0 directly to stop all heating operations and trigger an overheat protection alarm to maximize the safety of core components such as the electronic oil pump drive motor, power devices, and battery pack.

[0037] For example, assume that the system presets a second temperature threshold of 120°C, and the initial high-frequency pulse voltage vector has an amplitude of 300V and a frequency of 2kHz.

[0038] First derating trigger: When the winding temperature reaches 120℃, the first-level derating is triggered, reducing both amplitude and frequency by 80%. The calculated new vector parameters are: amplitude = 300V × (1-80%) = 60V, frequency = 2kHz × (1-80%) = 400Hz. After the new vector is injected, heating continues while the temperature is monitored in real time. Secondary derating trigger: If the winding temperature remains at or above 120°C after 10 seconds, secondary derating is triggered, reducing the current 60V and 400Hz by 60%. The new parameters are: amplitude = 60V × (1-60%) = 24V, frequency = 400Hz × (1-60%) = 160Hz. Heating continues and monitoring continues. Three-stage derating trigger: If the temperature does not drop after 5 seconds of monitoring, a third-stage derating is triggered, reducing the voltage by 40% from the base of 24V and 160Hz. The new parameters are: amplitude = 24V × (1-40%) = 14.4V, frequency = 160Hz × (1-40%) = 96Hz. Four-stage derating trigger: If the temperature does not fall below 120℃, a fourth-stage derating is triggered, reducing the voltage by 20% from 14.4V and 96Hz. The final parameters are: amplitude = 14.4V × (1-20%) = 11.52V, frequency = 96Hz × (1-20%) = 76.8Hz.

[0039] In one possible implementation, after injecting the high-frequency pulse voltage vector into the windings of the target motor to generate a large-amplitude alternating current in the windings, thereby heating the lubricating oil, the method further includes the following steps: A1: Based on the injected high-frequency pulse voltage vector and feedback current signal, the equivalent load torque of the target motor is estimated using the EKF sensorless observer algorithm.

[0040] During pulse heating, the injected high-frequency pulse voltage vector parameters (including amplitude, frequency, and phase) and the real-time feedback current signal of the target motor can be collected simultaneously. Using these two types of data as input, the sensorless observer algorithm of the Extended Kalman Filter (EKF) is used for dynamic calculation to accurately estimate the current equivalent load torque of the target motor (i.e., the electronic oil pump drive motor of the heavy truck oil-cooled electric drive axle). This torque directly reflects the starting resistance after the lubricating oil viscosity decreases and is the core indicator for judging the starting conditions.

[0041] A21: When the equivalent load torque is less than the rated torque, it is determined that the starting conditions of the target motor are met, and the high-frequency pulse voltage vector is set to 0 to stop heating.

[0042] The estimated equivalent load torque is compared with the motor's rated torque. If the equivalent load torque is less than the rated torque, it indicates that the lubricating oil viscosity has dropped to a reasonable range, and the motor output torque can overcome the starting resistance, thus determining that the starting conditions of the target motor are met. At this point, the high-frequency pulse voltage vector can be set to 0 to stop the pulse heating process and prepare for subsequent start-up switching.

[0043] A22: When the equivalent load torque is greater than or equal to the rated torque, it is determined that the starting conditions of the target motor are not met. The amplitude and frequency parameters of the high-frequency pulse voltage vector are increased to obtain a new high-frequency pulse voltage vector. The pulse injection and equivalent load torque estimation steps are repeated using the latest high-frequency pulse voltage vector until the starting conditions of the target motor are met.

[0044] If the estimated equivalent load torque is greater than or equal to the rated torque, it indicates that the lubricating oil viscosity is still too high, the starting resistance has not reached the starting threshold, and the starting conditions are not met. At this time, the amplitude and frequency of the high-frequency pulse voltage vector can be increased through a closed-loop adjustment algorithm to generate a new high-frequency pulse voltage vector with stronger power, which is then re-injected into the target motor winding to enhance the heating effect. The "pulse injection-current feedback-equivalent load torque estimation" cycle is then repeated until the estimated equivalent load torque is less than the rated torque and the starting conditions are met. Then, heating is stopped and the subsequent starting procedure is triggered to ensure that the electronic oil pump starts smoothly under controllable resistance.

[0045] The above steps, through the closed-loop logic of "torque comparison - dynamic power control", avoid both underheating and overheating, and do not require additional sensors.

[0046] See Figure 2 , Figure 2 This is a schematic diagram of a heating control device for lubricating oil provided in an embodiment of this application. Figure 2 As shown, the heating control device for the lubricating oil includes: The oil temperature acquisition unit 201 is used to acquire the oil temperature of the lubricating oil in the oil-cooled electric drive axle of the heavy truck; Duty cycle acquisition unit 202 is used to calculate the duty cycle signal for controlling the target motor if the oil temperature is less than or equal to the first temperature threshold; the target motor is the electronic oil pump drive motor of the heavy truck oil-cooled electric drive bridge. Voltage vector generation unit 203 is used to generate a high-frequency pulse voltage vector based on the duty cycle signal; The injection unit 204 is used to inject the high-frequency pulse voltage vector into the winding of the target motor so that the winding generates a large-value alternating current, thereby heating the lubricating oil.

[0047] In one possible implementation, the voltage vector generation unit 203 is specifically used for: Analyze the power demand corresponding to the duty cycle signal; Based on the power requirement, the basic waveform of the high-frequency pulse voltage vector is determined; The high-frequency pulse voltage is obtained by setting the amplitude and frequency corresponding to the duty cycle signal to the amplitude and frequency of the basic waveform.

[0048] In one possible implementation, the device further includes: Temperature monitoring unit, used to monitor the temperature of the winding in real time; An adjustment unit is used to reduce the amplitude and frequency of the high-frequency pulse voltage vector to obtain a new high-frequency pulse voltage vector when the temperature of the winding is greater than or equal to a second temperature threshold, so as to re-inject the latest high-frequency pulse voltage vector into the winding.

[0049] In one possible implementation, When the amplitude of the high-frequency pulse voltage vector is reduced for the first time, both the amplitude and frequency of the high-frequency pulse voltage vector are reduced by 80% to obtain the first derating voltage vector; When the amplitude of the high-frequency pulse voltage vector is reduced for the second time, the amplitude and frequency of the first derating voltage vector are both reduced by 60% to obtain the second derating voltage vector. When the amplitude of the high-frequency pulse voltage vector is reduced three times, the amplitude and frequency of the second derating voltage vector are both reduced by 40% to obtain the third derating voltage vector. When the amplitude and frequency of the high-frequency pulse voltage vector are reduced four times, the amplitude and frequency of the third derating voltage vector are both reduced by 20% to obtain the fourth derating voltage vector. If the temperature of the winding is still greater than or equal to the second temperature threshold after the amplitude and frequency of the high-frequency pulse voltage vector are reduced four times, then the high-frequency pulse voltage vector is set to 0 to stop heating.

[0050] In one possible implementation, the device further includes: A torque estimation unit is used to estimate the equivalent load torque of the target motor based on the injected high-frequency pulse voltage vector and the feedback current signal using the EKF sensorless observer algorithm; the feedback current signal is the real-time current signal of the target motor. The first integrated unit is used to determine that the starting conditions of the target motor are met when the equivalent load torque is less than the rated torque, and to set the high-frequency pulse voltage vector to 0 in order to stop heating; The second integrated unit is used to determine that the starting conditions of the target motor are not met when the equivalent load torque is greater than or equal to the rated torque, increase the amplitude and frequency parameters of the high-frequency pulse voltage vector to obtain a new high-frequency pulse voltage vector, and repeatedly execute the pulse injection and equivalent load torque estimation steps using the latest high-frequency pulse voltage vector until the starting conditions of the target motor are met, and then stop.

[0051] In addition, this application embodiment also provides a heating control device for lubricating oil, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the heating control method for lubricating oil as described above.

[0052] In addition, this application embodiment also provides a computer-readable storage medium storing instructions that, when executed on a terminal device, cause the terminal device to perform the lubricating oil heating control method as described above.

[0053] This embodiment of the application obtains the lubricating oil temperature of the heavy-duty truck oil-cooled electric drive bridge and triggers targeted heating logic. A high-frequency pulse voltage vector is generated based on the duty cycle signal, and injected into the windings of the electronic oil pump drive motor to produce a large-scale alternating current. This not only utilizes the Joule effect of current for efficient heating but also improves heat conversion efficiency by linking the eddy current losses in the iron core, solving the problems of heat concentration and slow transfer in traditional heating methods, thus significantly improving heating efficiency. Simultaneously, the high-frequency pulse characteristics result in more uniform heat distribution, avoiding the risk of localized overheating, and eliminating the need to maintain a DC stall state for extended periods, significantly reducing the impact on power devices, motors, batteries, and drivers, and extending equipment lifespan. Furthermore, the duty cycle signal can dynamically adapt to power requirements, and the amplitude and frequency of the high-frequency pulse voltage vector can be flexibly adjusted, thereby quickly adapting to the characteristics of the heavy-duty truck oil-cooled electric drive bridge with its large oil volume and high heat capacity, shortening preheating time, and ensuring rapid start-up of the electronic oil pump.

[0054] The above provides a detailed description of a heating control method, apparatus, device, and storage medium for lubricating oil provided in this application. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0055] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0056] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A method for controlling the heating of lubricating oil, characterized in that, Applied to a controller, the method includes: To obtain the oil temperature of the lubricating oil in the oil-cooled electric drive axle of a heavy-duty truck; If the oil temperature is less than or equal to the first temperature threshold, then the duty cycle signal for controlling the target motor is calculated; the target motor is the electronic oil pump drive motor of the heavy truck oil-cooled electric drive bridge. A high-frequency pulse voltage vector is generated based on the duty cycle signal; The high-frequency pulse voltage vector is injected into the windings of the target motor to generate a large-amplitude alternating current in the windings, thereby heating the lubricating oil.

2. The method according to claim 1, characterized in that, The generation of a high-frequency pulse voltage vector based on the duty cycle signal includes: Analyze the power demand corresponding to the duty cycle signal; Based on the power requirement, the basic waveform of the high-frequency pulse voltage vector is determined; The high-frequency pulse voltage is obtained by setting the amplitude and frequency corresponding to the duty cycle signal to the amplitude and frequency of the basic waveform.

3. The method according to claim 1, characterized in that, The method further includes: Real-time monitoring of the winding temperature; When the temperature of the winding is greater than or equal to the second temperature threshold, the amplitude and frequency of the high-frequency pulse voltage vector are reduced to obtain a new high-frequency pulse voltage vector, so as to re-inject the latest high-frequency pulse voltage vector into the winding.

4. The method according to claim 3, characterized in that, When the amplitude of the high-frequency pulse voltage vector is reduced for the first time, both the amplitude and frequency of the high-frequency pulse voltage vector are reduced by 80% to obtain the first derating voltage vector; When the amplitude of the high-frequency pulse voltage vector is reduced for the second time, the amplitude and frequency of the first derating voltage vector are both reduced by 60% to obtain the second derating voltage vector. When the amplitude of the high-frequency pulse voltage vector is reduced three times, the amplitude and frequency of the second derating voltage vector are both reduced by 40% to obtain the third derating voltage vector. When the amplitude and frequency of the high-frequency pulse voltage vector are reduced four times, the amplitude and frequency of the third derating voltage vector are both reduced by 20% to obtain the fourth derating voltage vector. If the temperature of the winding is still greater than or equal to the second temperature threshold after the amplitude and frequency of the high-frequency pulse voltage vector are reduced four times, then the high-frequency pulse voltage vector is set to 0 to stop heating.

5. The method according to claim 1, characterized in that, After injecting the high-frequency pulse voltage vector into the windings of the target motor to generate a large-amplitude alternating current in the windings, thereby heating the lubricating oil, the method further includes: Based on the injected high-frequency pulse voltage vector and feedback current signal, the equivalent load torque of the target motor is estimated using the Extended Kalman Filter (EKF) sensorless observer algorithm; the feedback current signal is the real-time current signal of the target motor. When the equivalent load torque is less than the rated torque, it is determined that the starting conditions of the target motor are met, and the high-frequency pulse voltage vector is set to 0 to stop heating; When the equivalent load torque is greater than or equal to the rated torque, it is determined that the starting conditions of the target motor are not met. The amplitude and frequency parameters of the high-frequency pulse voltage vector are increased to obtain a new high-frequency pulse voltage vector. The pulse injection and equivalent load torque estimation steps are repeated using the latest high-frequency pulse voltage vector until the starting conditions of the target motor are met.

6. A heating control device for lubricating oil, characterized in that, The device includes: The oil temperature acquisition unit is used to acquire the oil temperature of the lubricating oil in the oil-cooled electric drive axle of heavy-duty trucks; The duty cycle acquisition unit is used to calculate the duty cycle signal for controlling the target motor if the oil temperature is less than or equal to a first temperature threshold; the target motor is the electronic oil pump drive motor of the heavy truck oil-cooled electric drive bridge. A voltage vector generation unit is used to generate a high-frequency pulse voltage vector based on the duty cycle signal; An injection unit is used to inject the high-frequency pulse voltage vector into the windings of the target motor to generate a large-value alternating current in the windings, thereby heating the lubricating oil.

7. The apparatus according to claim 6, characterized in that, The voltage vector generation unit is specifically used for: Analyze the power demand corresponding to the duty cycle signal; Based on the power requirement, the basic waveform of the high-frequency pulse voltage vector is determined; The high-frequency pulse voltage is obtained by setting the amplitude and frequency corresponding to the duty cycle signal to the amplitude and frequency of the basic waveform.

8. The apparatus according to claim 6, characterized in that, The device further includes: Temperature monitoring unit, used to monitor the temperature of the winding in real time; An adjustment unit is used to reduce the amplitude and frequency of the high-frequency pulse voltage vector to obtain a new high-frequency pulse voltage vector when the temperature of the winding is greater than or equal to a second temperature threshold, so as to re-inject the latest high-frequency pulse voltage vector into the winding.

9. A heating control device for lubricating oil, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the heating control method for lubricating oil as described in any one of claims 1-5.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions that, when executed on a terminal device, cause the terminal device to perform the heating control method for lubricating oil as described in any one of claims 1-5.

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