Vehicle oil pump locked-rotor control method and device

Abstract

The invention relates to the technical field of vehicle safety control, in particular to a vehicle oil pump locked-rotor control method and device.The method comprises the steps that the current motor temperature and the actual motor rotating speed of a motor are collected, and the actual phase current and the actual oil pump output pressure of a vehicle oil pump are obtained; based on the actual phase current, the current motor temperature, the actual oil pump output pressure and the actual motor rotating speed, whether the vehicle oil pump meets the preset locked-rotor occurrence condition or not is judged; and if the vehicle oil pump meets the preset locked-rotor occurrence condition, the vehicle oil pump is controlled to execute a preset protection action. Therefore, the problems that in existing locked-rotor detection of the electric oil pump, misinformation and missed information are likely to occur through single current judgment, and the protection strategy after locked-rotor is difficult to meet the cooling and lubricating requirements, so that the locked-rotor fault recognition precision of the oil pump is affected, and abnormal shutdown is caused are solved.

Description

Technical Field

[0001] This application relates to the field of vehicle safety control technology, and in particular to a method and device for controlling the stall of a vehicle oil pump. Background Technology

[0002] In related technologies, to avoid losses caused by vehicle oil pump stalling, the industry generally uses current monitoring to determine the stalling status of electric oil pumps. The core principle is to preset the current threshold range for normal operation of the electric oil pump, and collect the operating current of the electric oil pump in real time through a current detection module. When the detected current exceeds the preset threshold, it is determined that the electric oil pump has stalled and triggers the protection mechanism. The current protection logic usually controls the electric oil pump to attempt to restart a limited number of times (such as 3-5 times) after detecting the "stalling signal". If the stalling status is not resolved after restarting, in order to avoid damage to the electric oil pump due to high temperature caused by continuous stalling, the system will directly control the electric oil pump to stop.

[0003] However, the single current disk judgment method in related technologies has obvious limitations, specifically in the following aspects: False alarm risk: Under special conditions such as low temperature start-up and high load operation (such as rapid acceleration and hill climbing of hybrid vehicles, the demand for lubrication and cooling of the assembly surges, and the electric oil pump needs to operate at full load), the resistance of the electric oil pump motor windings decreases due to the temperature drop, or the motor needs to output more torque to meet the flow demand. This will cause the operating current to temporarily increase and exceed the preset threshold. At this time, the system is prone to misjudging the stall fault, triggering unnecessary protection actions, and affecting the normal operation switching of the hybrid transmission and electric drive assembly.

[0004] Risk of missed detection: When the electric oil pump shows signs of stalling due to slight rotor jamming, but other faults such as short circuit between motor windings and abnormally low power supply voltage exist at the same time, the operating current of the electric oil pump may not reach the preset stall detection threshold due to the decrease in motor output power. This will cause the system to fail to identify the stall fault, miss the best intervention time, and ultimately lead to complete damage to the electric oil pump and a shutdown of the entire assembly.

[0005] In addition to the drawbacks mentioned above, the shutdown protection method will cause the hybrid transmission and electric drive assembly to lose the supply of cooling and lubrication media. Even if other components of the assembly are not faulty, they will be forced to shut down because the cooling and lubrication requirements cannot be met, which seriously affects the driving safety and reliability of hybrid vehicles. Especially in scenarios such as high-speed driving and complex road conditions, it may cause more serious safety hazards, which urgently need to be improved. Summary of the Invention

[0006] This application provides a vehicle oil pump stall control method and device to solve the problems in the related technology, such as the fact that in the existing electric oil pump stall detection, the single current judgment is prone to false alarms and missed alarms, and the protection strategy after stall is difficult to meet the cooling and lubrication requirements, which in turn affects the accuracy of oil pump stall fault identification and leads to abnormal shutdown.

[0007] The first aspect of this application provides a vehicle oil pump stall control method, comprising the following steps: collecting the current motor temperature and actual motor speed of the motor, and obtaining the actual phase current and actual oil pump output pressure of the vehicle oil pump; determining whether the vehicle oil pump meets preset stall conditions based on the actual phase current, the current motor temperature, the actual oil pump output pressure and the actual motor speed; if the vehicle oil pump meets the preset stall conditions, controlling the vehicle oil pump to perform a preset protection action.

[0008] Through the aforementioned technical means, this embodiment of the application can accurately identify the stall state of a vehicle's oil pump by integrating multi-dimensional data such as motor temperature, speed, phase current, and output pressure. It employs a triple-based criterion of current, speed, and pressure, combined with a temperature-adaptive dynamic threshold, effectively distinguishing between stall and normal heavy load, significantly reducing the false alarm rate. This system can quickly trigger protective actions in the early stages of stall, preventing serious malfunctions such as motor burnout and pump damage, thereby ensuring the safety of the hydraulic system, extending the lifespan of key components, and improving the reliability and intelligence level of the entire vehicle system.

[0009] Optionally, in one embodiment of this application, determining whether the vehicle oil pump meets the preset stall condition based on the actual phase current, the current motor temperature, the actual oil pump output pressure, and the actual motor speed includes: identifying the current operating condition of the vehicle; matching the phase current threshold of the vehicle oil pump according to the current operating condition; determining whether the actual phase current is greater than the phase current threshold; if the actual phase current is greater than the phase current threshold, determining whether the vehicle oil pump meets at least two of the following conditions: the current motor temperature is greater than a preset temperature, the actual oil pump output pressure is less than a preset pressure threshold, and the actual motor speed is less than a preset speed threshold and the duration is greater than a first preset duration; if at least two conditions are met, it is determined that the preset stall condition is met.

[0010] Through the above-mentioned technical means, the embodiments of this application can overcome the limitations of single parameter misjudgment and poor adaptability of fixed threshold by using a stall judgment logic that dynamically matches the phase current threshold under working conditions and verifies the combination of multiple parameters. It can accurately identify the risk of oil pump stall under different working conditions, and avoid false triggering through cross-verification of multiple indicators and continuous monitoring. It can identify the fault trend in advance before the oil pump is completely stalled, reserve response time for protection actions, effectively avoid chain failures such as oil pump burnout and motor overload, and significantly improve the safety and reliability of the vehicle power system.

[0011] Optionally, in one embodiment of this application, controlling the vehicle oil pump to perform a preset protection action includes: sending a reverse operation command to the vehicle oil pump to control the motor to reverse and continue for a second preset duration.

[0012] Through the above-mentioned technical means, the embodiments of this application can, after determining that the vehicle oil pump meets the conditions for stalling, control the motor to reverse and continue for a second preset time by sending a reverse operation command. This can attempt to relieve the oil pump stalling fault without directly shutting down the device, breaking through the limitations of the traditional "fault-based shutdown" protection mode. It can quickly eliminate the hidden danger of oil pump jamming, reduce the life loss caused by frequent start-stop of the device, avoid the impact of shutdown on the continuous operation of the vehicle power system, and reduce the risk of motor overload and overheating caused by stalling. It can significantly improve the operational reliability and fault self-recovery capability of the oil pump and the vehicle power system.

[0013] Optionally, in one embodiment of this application, controlling the vehicle oil pump to perform a preset protection action further includes: detecting the actual temperature of the motor; if the actual temperature is detected to be less than a preset threshold, determining that the fault has been eliminated and controlling the vehicle oil pump to operate; otherwise, controlling the motor to operate in a pulsed manner using a preset pulse impact strategy until the actual temperature is less than the preset threshold. During the pulsed operation, if the actual temperature is greater than a preset high-temperature threshold, controlling the vehicle oil pump to enter a cooling mode to utilize the cooling system to cool the motor until it is below the preset threshold.

[0014] Through the above-mentioned technical means, the embodiments of this application can construct a hierarchical and progressive fault handling mechanism of "temperature detection - fault judgment - pulse impact - cooling protection" on the basis of oil pump stall triggering reverse operation protection. The actual motor temperature is monitored to determine whether the stall is relieved. When the temperature does not exceed the threshold, the pulse impact strategy is used to further eliminate the jamming risk. When the temperature exceeds the high temperature threshold, the cooling system is activated to force cooling. This can avoid the limitations of traditional single reverse operation or direct shutdown protection, realize precise and step-by-step handling of stall faults, and effectively prevent the motor from being damaged by overheating during fault handling. It can also significantly improve the self-recovery capability of oil pump faults and the safety and continuity of the vehicle power system operation, and reduce the impact of fault handling on the smoothness of vehicle driving.

[0015] Optionally, in one embodiment of this application, controlling the vehicle oil pump to perform a preset protection action further includes: counting the number of cycles of the vehicle oil pump during pulse operation; if the number of cycles is greater than a preset number, determining that the vehicle oil pump is in a state of failure that cannot be resolved by itself, controlling the motor to enter a low-speed maintenance mode, and sending a fault alarm signal.

[0016] Through the above-mentioned technical means, the embodiments of this application can count the number of cycles during the pulse operation of the oil pump and set a preset number threshold as the basis for judging the feasibility of fault self-recovery. When the number of cycles exceeds the limit, it is determined that the fault cannot be resolved by itself, and then the motor is controlled to enter the low-speed maintenance mode and a fault alarm signal is sent. This can avoid motor overheating and performance degradation caused by unlimited pulse impact, and ensure the basic operating requirements of the vehicle power system through the low-speed maintenance mode. At the same time, the fault alarm signal can realize timely early warning and location of faults, greatly improve the precision of oil pump stall fault handling and system maintainability, and effectively reduce the risk of fault escalation.

[0017] A second aspect of this application provides a vehicle oil pump stall control device, comprising: a data acquisition module for acquiring the current motor temperature and actual motor speed of the motor, and obtaining the actual phase current and actual oil pump output pressure of the vehicle oil pump; a judgment module for judging whether the vehicle oil pump meets a preset stall condition based on the actual phase current, the current motor temperature, the actual oil pump output pressure, and the actual motor speed; and a control module for controlling the vehicle oil pump to perform a preset protection action if the vehicle oil pump meets the preset stall condition.

[0018] Through the aforementioned technical means, this embodiment of the application can accurately identify the stall state of a vehicle's oil pump by integrating multi-dimensional data such as motor temperature, speed, phase current, and output pressure. It employs a triple-based criterion of current, speed, and pressure, combined with a temperature-adaptive dynamic threshold, effectively distinguishing between stall and normal heavy load, significantly reducing the false alarm rate. This system can quickly trigger protective actions in the early stages of stall, preventing serious malfunctions such as motor burnout and pump damage, thereby ensuring the safety of the hydraulic system, extending the lifespan of key components, and improving the reliability and intelligence level of the entire vehicle system.

[0019] Optionally, in one embodiment of this application, the judgment module includes: an identification unit for identifying the current operating condition of the vehicle; a matching unit for matching the phase current threshold of the vehicle oil pump according to the current operating condition; a first judgment unit for judging whether the actual phase current is greater than the phase current threshold; a second judgment unit for judging whether the vehicle oil pump satisfies at least two of the following if the actual phase current is greater than the phase current threshold: whether the current motor temperature is greater than a preset temperature, whether the actual oil pump output pressure is less than a preset pressure threshold, and whether the actual motor speed is less than a preset speed threshold and the duration is greater than a first preset duration; and a third judgment unit for judging whether the preset stall condition is met if the at least two conditions are met.

[0020] Through the above-mentioned technical means, the embodiments of this application can overcome the limitations of single parameter misjudgment and poor adaptability of fixed threshold by using a stall judgment logic that dynamically matches the phase current threshold under working conditions and verifies the combination of multiple parameters. It can accurately identify the risk of oil pump stall under different working conditions, and avoid false triggering through cross-verification of multiple indicators and continuous monitoring. It can identify the fault trend in advance before the oil pump is completely stalled, reserve response time for protection actions, effectively avoid chain failures such as oil pump burnout and motor overload, and significantly improve the safety and reliability of the vehicle power system.

[0021] Optionally, in one embodiment of this application, the control module includes: a sending unit, configured to send a reverse operation command to the vehicle oil pump to control the motor to reverse and continue for a second preset duration.

[0022] Through the above-mentioned technical means, the embodiments of this application can, after determining that the vehicle oil pump meets the conditions for stalling, control the motor to reverse and continue for a second preset time by sending a reverse operation command. This can attempt to relieve the oil pump stalling fault without directly shutting down the device, breaking through the limitations of the traditional "fault-based shutdown" protection mode. It can quickly eliminate the hidden danger of oil pump jamming, reduce the life loss caused by frequent start-stop of the device, avoid the impact of shutdown on the continuous operation of the vehicle power system, and reduce the risk of motor overload and overheating caused by stalling. It can significantly improve the operational reliability and fault self-recovery capability of the oil pump and the vehicle power system.

[0023] Optionally, in one embodiment of this application, the control module further includes: a detection unit for detecting the actual temperature of the motor; and a control unit for determining that the fault has been eliminated and controlling the vehicle oil pump to operate when the detected actual temperature is less than a preset threshold; otherwise, controlling the motor to operate in a pulsed manner using a preset pulse impact strategy until the actual temperature is less than the preset threshold. During the pulsed operation, if the actual temperature is greater than a preset high-temperature threshold, the vehicle oil pump is controlled to enter a cooling mode to utilize the cooling system to cool the motor until it is below the preset threshold.

[0024] Through the above-mentioned technical means, the embodiments of this application can construct a hierarchical and progressive fault handling mechanism of "temperature detection - fault judgment - pulse impact - cooling protection" on the basis of oil pump stall triggering reverse operation protection. The actual motor temperature is monitored to determine whether the stall is relieved. When the temperature does not exceed the threshold, the pulse impact strategy is used to further eliminate the jamming risk. When the temperature exceeds the high temperature threshold, the cooling system is activated to force cooling. This can avoid the limitations of traditional single reverse operation or direct shutdown protection, realize precise and step-by-step handling of stall faults, and effectively prevent the motor from being damaged by overheating during fault handling. It can also significantly improve the self-recovery capability of oil pump faults and the safety and continuity of the vehicle power system operation, and reduce the impact of fault handling on the smoothness of vehicle driving.

[0025] Optionally, in one embodiment of this application, the control module is further configured to: count the number of cycles of the vehicle oil pump during pulse operation; if the number of cycles is greater than a preset number, determine that the vehicle oil pump is in a state of failure that cannot be resolved by itself, control the motor to enter a low-speed maintenance mode, and send a fault alarm signal.

[0026] Through the above-mentioned technical means, the embodiments of this application can count the number of cycles during the pulse operation of the oil pump and set a preset number threshold as the basis for judging the feasibility of fault self-recovery. When the number of cycles exceeds the limit, it is determined that the fault cannot be resolved by itself, and then the motor is controlled to enter the low-speed maintenance mode and a fault alarm signal is sent. This can avoid motor overheating and performance degradation caused by unlimited pulse impact, and ensure the basic operating requirements of the vehicle power system through the low-speed maintenance mode. At the same time, the fault alarm signal can realize timely early warning and location of faults, greatly improve the precision of oil pump stall fault handling and system maintainability, and effectively reduce the risk of fault escalation.

[0027] A third aspect of this application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the vehicle oil pump stall control method as described in the above embodiments.

[0028] A fourth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the vehicle oil pump stall control method described above.

[0029] A fifth aspect of this application provides a computer program product that stores a computer program that, when executed by a processor, implements the vehicle oil pump stall control method described above.

[0030] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0031] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart of a vehicle oil pump stall control method provided according to an embodiment of this application; Figure 2 This is a schematic diagram of the vehicle oil pump stall control device according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of an electronic device according to an embodiment of this application. Detailed Implementation

[0032] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0033] In the operating system of hybrid transmissions and electric drive assemblies, the electric oil pump is one of the core functional components. Its main function is to provide cooling and lubrication media (such as lubricating oil) for key moving parts such as motors and gears inside the assembly. Through continuous circulation of the media, the heat generated by the operation of the parts is removed, and a lubricating film is formed on the surface of the parts to reduce friction loss. This ensures that the hybrid transmission and electric drive assembly can continuously and stably realize the power transmission and conversion function under preset operating conditions.

[0034] However, during the actual operation of the electric oil pump, impurities can easily enter the internal cavity of the electric oil pump due to factors such as the internal working conditions of the hybrid transmission and electric drive assembly (e.g., metal shavings generated by component wear) and the intrusion of external environmental impurities (e.g., foreign objects introduced during maintenance). When impurities accumulate or become stuck in key moving parts such as the meshing gap between the inner and outer rotors and the mating surface between the rotor and the pump body, the rotor rotation resistance will increase sharply, causing rotor jamming. If the jamming problem is not resolved in time, the electric oil pump will further enter a stalled state. At this time, the motor output torque will continue to act on the jammed rotor, causing the electric oil pump operating current to rise abnormally. At the same time, the motor windings and pump body will generate a large amount of Joule heat due to the excessive current. When the heat cannot be dissipated in time, the temperature of the electric oil pump will rise sharply, eventually leading to serious failures such as motor burnout and pump body damage, affecting the normal operation of the hybrid transmission and electric drive assembly.

[0035] Therefore, this application proposes a new method and device for controlling vehicle oil pump stall to avoid losses caused by the aforementioned stall failure.

[0036] The following description, with reference to the accompanying drawings, describes a vehicle oil pump stall control method and apparatus according to embodiments of this application. Addressing the issues raised in the background section of the aforementioned related technologies, where existing electric oil pump stall detection methods rely on single-current judgment, leading to false alarms and missed alarms, and where post-stall protection strategies fail to meet cooling and lubrication requirements, thus affecting the accuracy of oil pump stall fault identification and causing abnormal shutdowns, this application provides a vehicle oil pump stall control method. This method can accurately identify stall faults and reduce false alarms and missed alarms by adding stall judgment conditions; simultaneously, it optimizes the post-stall protection mechanism, improving the probability of fault elimination while effectively controlling the temperature rise of the electric oil pump motor, preventing abnormal shutdowns of the assembly due to oil pump problems, and ensuring the stable operation of the hybrid transmission and electric drive assembly. Therefore, this solves the problems in existing electric oil pump stall detection methods where single-current judgment easily leads to false alarms and missed alarms, and where post-stall protection strategies fail to meet cooling and lubrication requirements, thus affecting the accuracy of oil pump stall fault identification and causing abnormal shutdowns.

[0037] Specifically, Figure 1 This is a schematic flowchart illustrating a vehicle oil pump stall control method provided in an embodiment of this application.

[0038] like Figure 1 As shown, the vehicle's oil pump stall control method includes the following steps: In step S101, the current motor temperature and actual motor speed of the motor are collected, and the actual phase current and actual oil pump output pressure of the vehicle oil pump are obtained.

[0039] In actual implementation, the embodiments of this application can collect the current motor temperature by embedding a temperature sensor in the motor stator winding, install a Hall speed sensor at the motor shaft end to detect the rotor magnet pulse signal to calculate the actual motor speed, connect a current Hall sensor in series in the oil pump drive circuit to collect the actual phase current, and deploy a pressure sensor at the oil pump outlet to collect the actual output pressure, thereby realizing the synchronous collection of the core operating parameters of the motor and the oil pump.

[0040] Furthermore, after collecting the above parameters, it is possible to determine whether the vehicle's oil pump is stuck based on these parameters.

[0041] In step S102, based on the actual phase current, the current motor temperature, the actual oil pump output pressure, and the actual motor speed, it is determined whether the vehicle oil pump meets the preset stall conditions.

[0042] Optionally, in one embodiment of this application, determining whether the vehicle oil pump meets the preset stall condition based on the actual phase current, the current motor temperature, the actual oil pump output pressure, and the actual motor speed includes: identifying the current operating condition of the vehicle; matching the phase current threshold of the vehicle oil pump according to the current operating condition; determining whether the actual phase current is greater than the phase current threshold; if the actual phase current is greater than the phase current threshold, determining whether the vehicle oil pump meets at least two of the following conditions: the current motor temperature is greater than a preset temperature, the actual oil pump output pressure is less than a preset pressure threshold, and the actual motor speed is less than a preset speed threshold and the duration is greater than a first preset duration; if at least two conditions are met, it is determined that the preset stall condition is met.

[0043] For example, the stall detection strategy provided in the embodiments of this application can be summarized as follows: First, it can be determined whether the operating current of the electric oil pump exceeds the "operating condition adapted phase current threshold". Unlike the traditional fixed threshold, the embodiment of this application can pre-set the corresponding phase current threshold range Ia according to different operating conditions (such as low temperature start-up, high load, and normal operation). When the detected phase current exceeds the threshold range of the current operating condition, the next step of judgment is performed; if it does not exceed the threshold, it is determined to be a normal operating state, avoiding false alarms caused by differences in operating conditions. Fault confirmation criteria: A stall fault is determined when at least two of the following conditions are met in addition to the current exceeding the threshold: a. Motor winding temperature: The temperature exceeds the set threshold Ta; b. Oil pump output pressure: The output pressure is lower than the set threshold pressure (Pa); c. Motor speed: The actual speed is lower than the set threshold Qa, and the duration exceeds 2 seconds.

[0044] Motor sector: If the motor sector does not change within 5 seconds, it is directly judged as stalled.

[0045] Through the above-mentioned technical means, the embodiments of this application can overcome the limitations of single parameter misjudgment and poor adaptability of fixed threshold by using a stall judgment logic that dynamically matches the phase current threshold under working conditions and verifies the combination of multiple parameters. It can accurately identify the risk of oil pump stall under different working conditions, and avoid false triggering through cross-verification of multiple indicators and continuous monitoring. It can identify the fault trend in advance before the oil pump is completely stalled, reserve response time for protection actions, effectively avoid chain failures such as oil pump burnout and motor overload, and significantly improve the safety and reliability of the vehicle power system.

[0046] In step S103, if the vehicle oil pump meets the preset stall conditions, the vehicle oil pump is controlled to perform a preset protection action.

[0047] Optionally, in one embodiment of this application, controlling the vehicle oil pump to perform a preset protection action includes: sending a reverse operation command to the vehicle oil pump to control the motor to reverse and continue for a second preset duration.

[0048] In actual implementation, the embodiments of this application can set an automatic protection strategy after stalling, so as to better control the vehicle oil pump to perform preset protection actions. This protection strategy can not directly stop the machine after determining that the electric oil pump has stalled, but adopt a "graded intervention + cyclic trial" protection strategy to improve the probability of fault elimination while controlling the motor temperature rise.

[0049] Specifically, this embodiment can be used as the first stage of the above protection strategy. Specifically, the reverse flushing intervention first controls the electric oil pump to enter the "reverse operation mode" to control the motor to rotate in the reverse direction and run continuously for 5 seconds. In this mode, the reverse rotation uses the reverse flow of lubricating oil to impact the impurities stuck in the rotor gap or mating surface, and attempts to flush the impurities away from the critical parts.

[0050] Through the above-mentioned technical means, the embodiments of this application can, after determining that the vehicle oil pump meets the conditions for stalling, control the motor to reverse and continue for a second preset time by sending a reverse operation command. This can attempt to relieve the oil pump stalling fault without directly shutting down the device, breaking through the limitations of the traditional "fault-based shutdown" protection mode. It can quickly eliminate the hidden danger of oil pump jamming, reduce the life loss caused by frequent start-stop of the device, avoid the impact of shutdown on the continuous operation of the vehicle power system, and reduce the risk of motor overload and overheating caused by stalling. It can significantly improve the operational reliability and fault self-recovery capability of the oil pump and the vehicle power system.

[0051] Optionally, in one embodiment of this application, controlling the vehicle oil pump to perform a preset protection action further includes: detecting the actual temperature of the motor; if the actual temperature is detected to be less than a preset threshold, determining that the fault has been eliminated and controlling the vehicle oil pump to operate; otherwise, controlling the motor to operate in a pulsed manner using a preset pulse impact strategy until the actual temperature is less than the preset threshold. During the pulsed operation, if the actual temperature is greater than a preset high-temperature threshold, controlling the vehicle oil pump to enter a cooling mode to utilize the cooling system to cool the motor until it is below the preset threshold.

[0052] Specifically, this embodiment can serve as the second stage of the aforementioned protection strategy. Specifically, after completing the low-pressure reverse flushing, the operation is paused for 2 seconds to detect the motor winding temperature. If the temperature drops below Tb and the motor speed and current recover after restarting, the fault is determined to be eliminated, and the electric oil pump switches back to normal operating mode. If the temperature is still higher than Tb℃, or the normal operating conditions are still not met after restarting, the "pulse impact mode" is entered. The motor operates in a forward pulse mode (operating for 1 second, pausing for 0.5 seconds, and repeating 3 times). The pulse impact force is used to further clean impurities, while the pulse operation can avoid excessively rapid temperature rise caused by continuous high load.

[0053] Through the above-mentioned technical means, the embodiments of this application can construct a hierarchical and progressive fault handling mechanism of "temperature detection - fault judgment - pulse impact - cooling protection" on the basis of oil pump stall triggering reverse operation protection. The actual motor temperature is monitored to determine whether the stall is relieved. When the temperature does not exceed the threshold, the pulse impact strategy is used to further eliminate the jamming risk. When the temperature exceeds the high temperature threshold, the cooling system is activated to force cooling. This can avoid the limitations of traditional single reverse operation or direct shutdown protection, realize precise and step-by-step handling of stall faults, and effectively prevent the motor from being damaged by overheating during fault handling. It can also significantly improve the self-recovery capability of oil pump faults and the safety and continuity of the vehicle power system operation, and reduce the impact of fault handling on the smoothness of vehicle driving.

[0054] Optionally, in one embodiment of this application, controlling the vehicle oil pump to perform a preset protection action further includes: counting the number of cycles of the vehicle oil pump during pulse operation; if the number of cycles is greater than a preset number, determining that the vehicle oil pump is in a state of failure that cannot be resolved by itself, controlling the motor to enter a low-speed maintenance mode, and sending a fault alarm signal.

[0055] This embodiment can serve as the third stage of the automatic protection strategy. Specifically, the aforementioned "reverse flushing + pulse impact" constitutes one cycle. After each cycle, it checks whether the fault has been eliminated. If not, the cycle can be repeated up to 10 times. During the cycle, the motor winding temperature is monitored in real time. If the temperature exceeds Ta℃ at any moment, the cycle is paused and enters "cooling mode" (controlling the oil pump to stop running and using the cooling system within the assembly to cool the motor until the temperature drops below Tb℃), and then the cycle continues. If the fault is still not eliminated after 5 cycles, it is determined to be a fault that cannot be resolved through automatic intervention. The electric oil pump is controlled to enter "low-speed maintenance mode" (running at the set minimum speed to maintain a minimum level of lubrication and cooling, preventing the assembly from stopping immediately). At the same time, a fault signal is sent to the vehicle control system to prompt manual maintenance, maximizing the short-term normal operation of the assembly. Simultaneously, the electric drive assembly detects the motor temperature and controls the motor speed to decrease, ensuring that the overall temperature rise of the motor assembly is slowed down when the oil pump stalls and cannot provide cooling lubricating oil. Through the above-mentioned technical means, the embodiments of this application can count the number of cycles during the pulse operation of the oil pump and set a preset number threshold as the basis for judging the feasibility of fault self-recovery. When the number of cycles exceeds the limit, it is determined that the fault cannot be resolved by itself, and then the motor is controlled to enter the low-speed maintenance mode and a fault alarm signal is sent. This can avoid motor overheating and performance degradation caused by unlimited pulse impact, and ensure the basic operating requirements of the vehicle power system through the low-speed maintenance mode. At the same time, the fault alarm signal can realize timely early warning and location of faults, greatly improve the precision of oil pump stall fault handling and system maintainability, and effectively reduce the risk of fault escalation.

[0056] This application provides multiple methods to monitor whether the electric oil pump is stalled. For example, it can detect phase current, speed, and pressure. If both of these trigger a condition within a set time, a stall is determined. It can also detect the electric oil pump motor sector. The DC brushless motor controls the motor rotation by supplying three-phase alternating current. Different power supply forms correspond to different sectors. When the motor sector does not change, it indicates that the electric oil pump motor is no longer rotating, i.e., the electric oil pump has a stall fault. To determine the magnitude of the stalled phase current, actual measurement is required to find a reasonable phase current magnitude. After the electric pump sends a stall fault signal, the electric drive assembly controls the motor speed to decrease, detects the motor temperature, and controls it within the normal range to prevent the motor from overheating due to the electric pump stall, which could lead to damage to the assembly. At the same time, the electric oil pump continuously rotates forward and reverse to try to expel the stalled impurities from the electric oil pump and clear the stall fault.

[0057] The above embodiments can simultaneously monitor whether the electric oil pump is stalled using multiple methods. The stall judgment logic breaks through the limitations of traditional single current judgment. By constructing a "multi-parameter collaborative judgment model," key judgment conditions are added to achieve accurate identification of stall faults. Four core parameters are selected as the basis for stall judgment: electric oil pump phase current, motor temperature, oil pump output pressure, and motor speed. Each parameter can be collected in real time by the corresponding detection module (current detection module collects current, temperature sensor collects winding temperature, pressure sensor collects output pressure, and speed sensor collects motor speed), ensuring data real-time performance and accuracy. This increases the accuracy of judgment, and the protection measures after stalling take into account both the electric oil pump and the electric drive assembly, thereby reducing the probability of functional damage to the entire electric drive assembly.

[0058] The vehicle oil pump stall control method proposed in this application can accurately identify stall faults and reduce false alarms and missed alarms by adding stall judgment conditions. Simultaneously, it optimizes the protection mechanism after stalling, improving the probability of fault elimination while effectively controlling the temperature rise of the electric oil pump motor. This prevents abnormal shutdown of the assembly due to oil pump problems and ensures the stable operation of the hybrid transmission and electric drive assembly. Therefore, it solves the problems in related technologies where existing electric oil pump stall detection methods, such as the susceptibility to false alarms and missed alarms due to single current judgment, and the difficulty in meeting cooling and lubrication requirements through post-stall protection strategies, affect the accuracy of oil pump stall fault identification and lead to abnormal shutdowns.

[0059] Next, refer to the appendix. Figure 2 This application describes a vehicle oil pump stall control device according to an embodiment of the present application.

[0060] Figure 2 This is a block diagram of a vehicle oil pump stall control device according to an embodiment of this application.

[0061] like Figure 2 As shown, the vehicle oil pump stall control device 10 includes: a data acquisition module 100, a judgment module 200, and a control module 300.

[0062] The acquisition module 100 is used to acquire the current motor temperature and actual motor speed of the motor, and to obtain the actual phase current and actual oil pump output pressure of the vehicle oil pump.

[0063] The judgment module 200 is used to determine whether the vehicle oil pump meets the preset stall conditions based on the actual phase current, the current motor temperature, the actual oil pump output pressure and the actual motor speed.

[0064] The control module 300 is used to control the vehicle oil pump to perform a preset protection action if the vehicle oil pump meets the preset stall conditions.

[0065] Optionally, in one embodiment of this application, the judgment module 200 includes: an identification unit, a matching unit, and first, second, and third judgment units; wherein, the identification unit is used to identify the current operating condition of the vehicle; the matching unit is used to match the phase current threshold of the vehicle oil pump according to the current operating condition; the first judgment unit is used to determine whether the actual phase current is greater than the phase current threshold; the second judgment unit is used to determine whether the vehicle oil pump satisfies at least two of the following conditions if the actual phase current is greater than the phase current threshold: whether the current motor temperature is greater than a preset temperature, whether the actual oil pump output pressure is less than a preset pressure threshold, and whether the actual motor speed is less than a preset speed threshold and the duration is greater than a first preset duration; the third judgment unit is used to determine that the preset stall condition is met if the at least two conditions are met.

[0066] Optionally, in one embodiment of this application, the control module 300 includes: a sending unit, which is used to send a reverse operation command to the vehicle oil pump to control the motor to reverse and continue for a second preset duration.

[0067] Optionally, in one embodiment of this application, the control module 300 further includes: a detection unit and a control unit; wherein the detection unit is used to detect the actual temperature of the motor; the control unit is used to determine that the fault has been eliminated and control the vehicle oil pump to work when the detected actual temperature is less than a preset threshold; otherwise, the control unit controls the motor to operate in a pulsed manner with a preset pulse impact strategy until the actual temperature is less than the preset threshold. During the pulsed operation, if the actual temperature is greater than the preset high temperature threshold, the control unit controls the vehicle oil pump to enter a cooling mode to cool the motor using the cooling system until it is lower than the preset threshold.

[0068] Optionally, in one embodiment of this application, the control module 300 is further configured to: count the number of cycles of the vehicle oil pump during pulse operation; if the number of cycles is greater than a preset number, determine that the vehicle oil pump is in a state of failure that cannot be resolved by itself, control the motor to enter a low-speed maintenance mode, and send a fault alarm signal.

[0069] It should be noted that the foregoing explanation of the vehicle oil pump stall control method embodiment also applies to the vehicle oil pump stall control device of this embodiment, and will not be repeated here.

[0070] The vehicle oil pump stall control device proposed in this application can accurately identify stall faults and reduce false alarms and missed alarms by adding stall judgment conditions. Simultaneously, it optimizes the protection mechanism after stalling, improving the probability of fault elimination while effectively controlling the temperature rise of the electric oil pump motor, thus preventing abnormal shutdown of the assembly due to oil pump problems and ensuring the stable operation of the hybrid transmission and electric drive assembly. This solves the problems in related technologies, where existing electric oil pump stall detection methods, relying solely on current judgment, are prone to false alarms and missed alarms, and the post-stall protection strategies are insufficient to meet cooling and lubrication requirements, thereby affecting the accuracy of oil pump stall fault identification and leading to abnormal shutdowns.

[0071] Figure 3 A schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device may include: The memory 301, the processor 302, and the computer program stored on the memory 301 and capable of running on the processor 302.

[0072] When the processor 302 executes the program, it implements the vehicle oil pump stall control method provided in the above embodiments.

[0073] Furthermore, electronic devices also include: Communication interface 303 is used for communication between memory 301 and processor 302.

[0074] The memory 301 is used to store computer programs that can run on the processor 302.

[0075] The memory 301 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0076] If the memory 301, processor 302, and communication interface 303 are implemented independently, then the communication interface 303, memory 301, and processor 302 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, Figure 3 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0077] Optionally, in a specific implementation, if the memory 301, processor 302, and communication interface 303 are integrated on a single chip, then the memory 301, processor 302, and communication interface 303 can communicate with each other through an internal interface.

[0078] Processor 302 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0079] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the above-described vehicle oil pump stall control method.

[0080] This application also provides a computer program product storing a computer program that, when executed by a processor, implements the above-described vehicle oil pump stall control method.

[0081] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0082] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0083] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0084] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0085] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, it can be implemented using any one or more of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0086] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0087] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0088] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A method for controlling the stall of a vehicle oil pump, characterized in that, Includes the following steps: Collect the current motor temperature and actual motor speed of the motor, and obtain the actual phase current and actual output pressure of the vehicle oil pump; Based on the actual phase current, the current motor temperature, the actual oil pump output pressure, and the actual motor speed, determine whether the vehicle oil pump meets the preset stall conditions; If the vehicle oil pump meets the preset stall conditions, then the vehicle oil pump is controlled to perform a preset protection action.

2. The method according to claim 1, characterized in that, The step of determining whether the vehicle oil pump meets the preset stall conditions based on the actual phase current, the current motor temperature, the actual oil pump output pressure, and the actual motor speed includes: Identify the vehicle's current operating condition; Match the phase current threshold of the vehicle oil pump according to the current operating conditions; Determine whether the actual phase current is greater than the phase current threshold; If the actual phase current is greater than the phase current threshold, then determine whether the vehicle oil pump meets at least two of the following conditions: the current motor temperature is greater than a preset temperature, the actual oil pump output pressure is less than a preset pressure threshold, and the actual motor speed is less than a preset speed threshold and the duration is greater than a first preset duration. If at least two of the conditions are met, then the preset stall condition is determined to be met.

3. The method according to claim 1, characterized in that, The control of the vehicle oil pump to perform preset protection actions includes: A reverse operation command is sent to the vehicle's oil pump to control the motor to reverse and continue for a second preset duration.

4. The method according to claim 3, characterized in that, The method of controlling the vehicle oil pump to perform preset protection actions also includes: Detect the actual temperature of the motor; If the actual temperature is detected to be less than a preset threshold, the fault is determined to be eliminated, and the vehicle oil pump is controlled to work. Otherwise, the motor is controlled to operate in a pulsed manner using a preset pulse impact strategy until the actual temperature is less than the preset threshold. During the pulsed operation, if the actual temperature is greater than the preset high temperature threshold, the vehicle oil pump is controlled to enter a cooling mode to cool the motor using the cooling system until it is lower than the preset threshold.

5. The method according to claim 1, characterized in that, The method of controlling the vehicle oil pump to perform preset protection actions also includes: During the pulse operation, the number of cycles of the vehicle's oil pump is counted; If the number of cycles exceeds a preset number, the vehicle oil pump is determined to be in a state of unresolved fault, the motor is controlled to enter a low-speed maintenance mode, and a fault alarm signal is sent.

6. A vehicle oil pump stall control device, characterized in that, include: The data acquisition module is used to acquire the current motor temperature and actual motor speed of the motor, and to obtain the actual phase current and actual output pressure of the vehicle oil pump. The judgment module is used to determine whether the vehicle oil pump meets the preset stall conditions based on the actual phase current, the current motor temperature, the actual oil pump output pressure and the actual motor speed. The control module is used to control the vehicle oil pump to perform a preset protection action if the vehicle oil pump meets the preset stall conditions.

7. The apparatus according to claim 6, characterized in that, The judgment module includes: The identification unit is used to identify the current operating condition of the vehicle; A matching unit is used to match the phase current threshold of the vehicle oil pump according to the current operating conditions; The first judgment unit is used to determine whether the actual phase current is greater than the phase current threshold. The second judgment unit is used to determine whether the vehicle oil pump meets at least two of the following conditions if the actual phase current is greater than the phase current threshold: whether the current motor temperature is greater than a preset temperature, whether the actual oil pump output pressure is less than a preset pressure threshold, and whether the actual motor speed is less than a preset speed threshold and the duration is greater than a first preset duration. The third judgment unit is used to determine that the preset stall occurrence condition is met if at least two of the conditions are met.

8. An electronic device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the vehicle oil pump stall control method as described in any one of claims 1-5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the vehicle oil pump stall control method as described in any one of claims 1-5.

10. A computer program product, comprising a computer program, characterized in that, The computer program is executed to implement the vehicle oil pump stall control method as described in any one of claims 1-5.

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