Motor bearing monitoring method and system, computer equipment, medium and vehicle

Abstract

The invention provides a motor bearing monitoring method and system, computer equipment, a medium and a vehicle, and the method comprises the steps: obtaining a motor bearing signal, and carrying out the state monitoring of a motor bearing based on the signal value reduction amount and the signal waveform of the motor bearing signal in a preset time period, and dynamically adjusting the lubricating oil flow of the motor bearing according to the state monitoring result of the motor bearing. The motor bearing signal comprises motor bearing current, and the state monitoring result of the motor bearing comprises that the lubricating oil flow of the motor bearing at the current moment is smaller than preset lubricating oil flow. The state of the motor bearing can be monitored in real time according to the motor bearing signal, the lubricating oil flow of the oil pump can be dynamically adjusted according to the state monitoring result of the motor bearing, and therefore precise lubrication and protection of the motor bearing are achieved. The lubricating oil flow of the oil pump can be dynamically adjusted, the lubricating efficiency of the motor bearing is improved, the operation power consumption of a power assembly is reduced, and meanwhile the service life of the motor bearing can be prolonged.

Description

Technical Field

[0001] This application relates to the technical field of vehicles, and particularly to a method and system for monitoring motor bearings, a computer device and a medium, and a vehicle. Background Art

[0002] In new energy vehicles, the motor bearing is one of the key components of the power system, and its working state directly affects the performance and reliability of the whole vehicle. Currently, the related lubrication method usually uses an electronic oil pump with a fixed rotation speed to spray lubricate the motor bearing along a fixed lubricating oil passage, which cannot dynamically adjust the lubricating oil flow according to the actual working conditions of the motor bearing, cannot monitor the state of the motor bearing in real time, and is prone to problems such as insufficient lubrication. For example, in the working condition where the real-time load is greater than the preset load or the real-time speed is greater than the preset speed, the fixed lubricating oil flow may cause insufficient lubrication of the motor bearing, which will accelerate the wear of the motor bearing. In addition, if the working state of the motor bearing cannot be monitored in real time, it is difficult to detect potential faults in time, thus affecting the service life of the motor bearing. Summary of the Invention

[0003] In view of the above-mentioned disadvantages of the prior art, the purpose of this application is to provide a method and system for monitoring motor bearings, a computer device and a medium, and a vehicle, which are used to solve the technical problems existing in the prior art.

[0004] To achieve the above purpose and other related purposes, this application provides a method for monitoring a motor bearing, including the following steps: Obtain motor bearing signals collected in advance or in real time, where the motor bearing signals include motor bearing current; Based on the signal value reduction amount and signal waveform of the motor bearing signal within a preset time period, monitor the state of the motor bearing, and dynamically adjust the lubricating oil flow of the motor bearing according to the state monitoring result of the motor bearing; wherein, the state monitoring result of the motor bearing includes that the lubricating oil flow of the motor bearing at the current moment is less than the preset lubricating oil flow.

[0005] In an embodiment of this application, the process of monitoring the state of the motor bearing based on the signal value reduction amount and signal waveform of the motor bearing signal within a preset time period includes: Within a preset time period, when the signal value reduction amount of the motor bearing signal is greater than or equal to a preset threshold, and the signal waveform of the motor bearing signal is different from the preset waveform, output the state monitoring result of the motor bearing as insufficient lubrication; under the condition of insufficient lubrication, the lubricating oil flow of the motor bearing at the current moment is less than the preset lubricating oil flow.

[0006] In an embodiment of the present application, the process of monitoring the state of the motor bearing based on the signal value reduction amount and signal waveform of the motor bearing signal within a preset time period further includes: Monitoring the state of the motor bearing based on the reduction amount and waveform of the mechanical spark discharge current corresponding to the motor bearing within a preset time period; wherein, the mechanical spark discharge current is formed under the condition that the motor shaft voltage breaks through the lubricating oil film of the motor bearing, and the motor shaft voltage is formed based on the potential differences at both ends of the motor shaft, at a local part of the motor shaft, and between the motor shaft and the ground; Alternatively, monitoring the state of the motor bearing based on the reduction amount and waveform of the circulating shaft current corresponding to the motor bearing within a preset time period; wherein, the circulating shaft current is obtained from the motor shaft voltage with flux asymmetry or the motor shaft voltage generated by variable frequency power supply; Alternatively, monitoring the state of the motor bearing based on the reduction amount and waveform of the rotor ground fault shaft current corresponding to the motor bearing within a preset time period; wherein, the rotor ground fault shaft current is formed under the conditions that the impedance between the rotor and the ground is less than the impedance between the stator and the ground and the current flows along a preset path, and the preset path includes passing through the stator winding, stator core, motor bearing, motor shaft, and ground point.

[0007] In an embodiment of the present application, the process of dynamically adjusting the lubricating oil flow rate of the motor bearing according to the state monitoring result of the motor bearing includes: When the vehicle powertrain includes the motor bearing, transmitting a first potential difference and a second potential difference to an electronic control unit in the vehicle; wherein, the first potential difference is obtained based on the potential difference between a first voltage test point and the motor housing, the second potential difference is obtained based on the potential difference between a second voltage test point and the motor housing, the first voltage test point is located at one end of the motor shaft, and the second voltage test point is located at the motor bearing at the other end of the motor shaft; If the lubricating oil flow rate of the motor bearing at the current moment is less than the preset lubricating oil flow rate, then the electronic control unit increases the pump speed according to the first potential difference and the second potential difference, and increases the lubricating oil flow rate sprayed on the motor bearing.

[0008] In an embodiment of the present application, the method further includes: Obtaining the real-time lubricating oil flow rate of the motor bearing after increasing the lubricating oil flow rate; When the real-time lubricating oil flow rate is less than the preset lubricating oil flow rate, comparing the current speed of the oil pump with the maximum speed; Under the condition that the current speed of the oil pump is equal to the maximum speed, a warning message is sent through the electronic control unit; wherein, the warning message is used to indicate that the motor bearing is damaged or to prompt the replacement of the lubricating oil.

[0009] In an embodiment of the present application, the method further includes: Obtain the minimum speed of the oil pump when mechanical spark discharge current or circulating shaft current appears under the conditions of fixed speed and torque. Conduct a lubricating oil flow test on the motor bearing according to the minimum speed of the oil pump, add the corresponding test data as a reference limit value to a pre-set or real-time database, and dynamically adjust the lubricating oil flow of the motor bearing according to the reference limit value in the database.

[0010] The present application also provides a motor bearing monitoring system, which includes: A signal acquisition module, configured to acquire motor bearing signals collected in advance or in real time, where the motor bearing signals include motor bearing current. A motor bearing monitoring module, configured to monitor the state of the motor bearing based on the signal value reduction amount and signal waveform of the motor bearing signals within a preset time period; wherein, the state monitoring result of the motor bearing includes that the lubricating oil flow of the motor bearing at the current moment is less than the preset lubricating oil flow. A dynamic adjustment module, configured to dynamically adjust the lubricating oil flow of the motor bearing according to the state monitoring result of the motor bearing.

[0011] The present application also provides a computer device, including a memory, a processor, and a computer program stored on the memory, and the processor executes the computer program to implement the steps of the motor bearing monitoring method described in any one of the above.

[0012] The present application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the motor bearing monitoring method described in any one of the above are implemented.

[0013] The present application also provides a vehicle, which includes the motor bearing monitoring system described above, or includes the computer device described above.

[0014] As described above, the present application provides a method and system for monitoring an electric machine bearing, a computer device and a medium, and a vehicle, which have the following beneficial effects: by acquiring the electric machine bearing signals collected in advance or in real time, and then based on the signal value reduction amount and the signal waveform of the electric machine bearing signals within a preset time period, the state of the electric machine bearing is monitored, and the lubricating oil flow rate of the electric machine bearing is dynamically adjusted according to the state monitoring result of the electric machine bearing; wherein, the electric machine bearing signals include the electric machine bearing current, and the state monitoring result of the electric machine bearing includes that the lubricating oil flow rate of the electric machine bearing at the current moment is less than the preset lubricating oil flow rate. It can be seen from this that the present application can monitor the state of the electric machine bearing in real time according to the electric machine bearing signals, and can also dynamically adjust the lubricating oil flow rate of the oil pump according to the state monitoring result of the electric machine bearing, so as to achieve precise lubrication and protection of the electric machine bearing. Therefore, the present application can dynamically adjust the lubricating oil flow rate of the oil pump, improve the lubrication efficiency of the electric machine bearing, reduce the operating power consumption of the power assembly, and at the same time extend the service life of the electric machine bearing. In addition, if the electric machine bearing is applied to the vehicle power assembly, the present application has a positive promoting effect on the development of the vehicle industry and has important practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic flow chart of the method for monitoring an electric machine bearing provided in an embodiment of the present application; Figure 2 It is a schematic diagram of the equivalent capacitance of the electric machine bearing provided in an embodiment of the present application; Figure 3 It is a schematic diagram of the electrical erosion of the electric machine bearing provided in an embodiment of the present application; Figure 4 It is a schematic diagram of collecting the first potential difference and the second potential difference provided in an embodiment of the present application; Figure 5 It is a schematic hardware structure diagram of the electric machine bearing monitoring system provided in an embodiment of the present application; Figure 6 It is a schematic hardware structure diagram of a computer device suitable for implementing one or more embodiments of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following uses specific concrete examples to illustrate the implementation manners of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It can be understood that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. In addition, it can be understood that the drawings provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner. Therefore, only the components related to the present application are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The types, quantities, and proportions of the components in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0017] Figure 1 The flowchart of a method for monitoring a motor bearing is shown. Specifically, in an exemplary embodiment, as Figure 1 shown, this embodiment provides a method for monitoring a motor bearing, and the method includes the following steps: S110, obtaining the motor bearing signals collected in advance or in real time, where the motor bearing signals include but are not limited to the motor bearing current; S120, performing state monitoring on the motor bearing based on the signal value reduction amount and the signal waveform of the motor bearing signals within a preset time period; where the state monitoring result of the motor bearing includes that the lubricating oil flow rate of the motor bearing at the current moment is less than the preset lubricating oil flow rate; S130, dynamically adjusting the lubricating oil flow rate of the motor bearing according to the state monitoring result of the motor bearing.

[0018] In some exemplary embodiments, the motor bearing current includes, but is not limited to, capacitive charging and discharging current, mechanical spark discharge current, circulating shaft current, rotor grounding shaft current, etc. Among them, the capacitive charging and discharging current, mechanical spark discharge current, circulating shaft current, and rotor grounding shaft current can be obtained through calculation or directly collected by instruments. For example, they can be directly collected by an oscilloscope. As an example, if the aforementioned motor bearing is a motor bearing in a new energy vehicle powertrain or a hybrid box of a new energy vehicle, the motor bearing current can be divided into differential mode shaft current and common mode shaft current according to the formation mechanism. The circulation path of the differential mode shaft current: the loop formed by the motor shaft → the motor bearing → the housing → the other end motor bearing, mainly represented by capacitive charging and discharging current, and no charge crosses the actual oil film insulation layer. The circulation path of the common mode current: the motor shaft → the motor bearing → the housing → the grounding point, mainly represented by mechanical spark discharge current (Electrical Discharge Machining, abbreviated as EDM), circulating shaft current, and rotor grounding shaft current. In all these cases, the oil film breakdown phenomenon occurs, which seriously affects the operation of the motor bearing and needs to be eliminated. Since there is an oil film between the inner and outer rings and the balls at the position of the motor bearing in the hybrid box, similar to a capacitive medium, the inner and outer rings of the motor bearing and the balls form capacitor plates and are in a non-conductive state. Therefore, the schematic diagram of the equivalent capacitance of the motor bearing can be referred to Figure 2 as shown. In Figure 2 , C0 can represent the equivalent capacitance of the inner and outer rings of the motor bearing, C b0 can represent the equivalent capacitance between the ball and the outer ring of the motor bearing, and C bi can represent the equivalent capacitance between the ball and the inner ring of the motor bearing. The insulation of the equivalent capacitance is determined by the thickness of the oil film between the inner and outer rings of the motor bearing and the balls. When the lubrication state is good and the insulation is high, the equivalent capacitance does not break down and no breakdown current is generated. When there is poor lubrication and low insulation, the equivalent capacitance is easily broken down and a breakdown current is generated. This breakdown current is likely to cause electrical erosion of the motor bearing, and the occurrence of electrical erosion will affect the reliability and stability of the operation of the motor bearing, as shown in Figure 3 . Figure 3 In (1), (2), (3), and (4) in r , they respectively represent different electrical erosion situations. In addition, the different content of the dielectric in the capacitor can be used to affect the insulation of the capacitor. The basic principle is to utilize the different insulation properties of lubricating oil films with different thicknesses. The thicker the oil film, the better the insulation, the higher the breakdown voltage required, and the less likely it is to form a breakdown current. The corresponding calculation formula for the equivalent capacitance can be: C = (ɛ0 * ɛ r * A) / d, where C is the equivalent capacitance, ɛ0 is the vacuum permittivity, ɛ r is the relative permittivity of the lubricating oil, A is the electrode area, and d is the oil film thickness.

[0019] According to the above description, in some exemplary embodiments, the process of monitoring the state of the motor bearing based on the signal value reduction and signal waveform of the motor bearing signal within a preset time period includes: within the preset time period, when the signal value reduction of the motor bearing signal is greater than or equal to a preset threshold and the signal waveform of the motor bearing signal is different from the preset waveform, output the state monitoring result of the motor bearing as insufficient lubrication; under the condition of insufficient lubrication, the lubricating oil flow rate of the motor bearing at the current moment is less than the preset lubricating oil flow rate. In some examples, the preset time period and the preset threshold can be set and selected according to the actual situation, and no specific numerical limitations are imposed here. For example, the preset time period can be set as the single sampling time of the motor bearing signal. Another example is that when the motor bearing signal is the motor bearing current, the preset threshold can be set to 0.2A, 0.25A, 0.3A, etc. In some examples, the preset waveform can be set and selected according to the actual situation, and no specific limitations are imposed on the preset waveform here. For example, the preset waveform can be a cosine waveform. As an example, within the single sampling time of the motor bearing signal, if the motor bearing current exceeds 0.2A and then rapidly drops to 0A, that is, the reduction amount of the motor bearing current within the single sampling time is greater than the preset threshold of 0.2A, and at the same time the waveform of the motor bearing current is not a complete cosine waveform or no longer has the characteristics of a cosine wave, it can be determined that the motor bearing has an electrical erosion phenomenon, and at this time the output state monitoring result of the motor bearing is insufficient lubrication. And under the condition of insufficient lubrication, the lubricating oil flow rate of the motor bearing at the current moment is less than the preset lubricating oil flow rate. In addition, in some examples, if within the preset time period, the signal value reduction of the motor bearing signal is less than the preset threshold and the signal waveform of the motor bearing signal is the same as the preset waveform, the output state monitoring result of the motor bearing at this time can be recorded as normal lubrication. Under the condition of normal lubrication, the lubricating oil flow rate of the motor bearing at the current moment is greater than or equal to the preset lubricating oil flow rate. The process of obtaining the state monitoring result that the lubrication of the motor bearing is normal based on the motor bearing current can refer to the foregoing process, and will not be elaborated here.

[0020] According to the above description, in some examples, the definitions and classifications of currents such as capacitive charge and discharge current, mechanical spark discharge current, circulating shaft current, and rotor ground shaft current can refer to Table 1 below.

[0021] Table 1 Definitions and Classifications of Motor Bearing Currents

[0022] Since a motor shaft voltage will be generated on the motor shaft of a new energy vehicle hybrid box assembly during operation, and the motor shaft voltage can be the potential difference between both ends of the motor shaft, at a local part of the motor shaft, and between the motor shaft and the ground, the potential difference that appears between the inner and outer rings of the motor bearing is the motor bearing oil film voltage. At the same time, according to the relevant standards, the effective value of the motor shaft voltage is not greater than 0.5V. The motor bearing oil film voltage is mainly generated by the potential difference caused by variable frequency power supply, and its essence is alternating current. After combining with the equivalent capacitance on the motor bearing, a simple AC circuit is formed. Therefore, in Table 1, i can represent the capacitive charge and discharge current, C can represent the equivalent capacitance, and dv / dt can represent the differential result of the motor bearing oil film voltage with respect to time.

[0023] In some exemplary embodiments, when the lubrication of the motor bearing is poor, the insulation of the lubricating oil covering the inner and outer rings and the balls of the motor bearing decreases, resulting in a gradual decrease in the equivalent capacitance bearing capacity of the motor bearing, and it is very easy to occur the phenomenon of capacitance breakdown. At this time, it is necessary to increase the lubrication at the motor bearing, increase the oil film thickness, enhance the equivalent capacitance insulation, and improve the capacitance breakdown bearing capacity. At the same time, it can be obtained from Table 1 that the capacitive charge and discharge is actually the current formed by repeatedly charging and discharging the equivalent capacitance, and there is no capacitance breakdown phenomenon, and no electro-erosion of the motor bearing will occur. The other three shaft currents have all occurred capacitance breakdown and short-time discharge, and electro-erosion will occur in all cases, which endangers the stable operation of the motor bearing. Therefore, the process of monitoring the state of the motor bearing based on the signal value reduction amount and the signal waveform of the motor bearing signal within a preset time period may further include: monitoring the state of the motor bearing based on the mechanical spark discharge current reduction amount and the mechanical spark discharge current waveform corresponding to the motor bearing within a preset time period; wherein, the mechanical spark discharge current is formed under the condition that the motor shaft voltage breaks through the lubricating oil film of the motor bearing, and the motor shaft voltage is formed based on the potential difference between both ends of the motor rotating shaft, the local part of the motor rotating shaft, and the motor rotating shaft to the ground. As shown in Table 1, when the motor shaft voltage is large enough to break through the lubricating oil film of the motor bearing, a breakdown will occur at this time and a mechanical spark discharge current will be generated. As another example, the process of monitoring the state of the motor bearing based on the signal value reduction amount and the signal waveform of the motor bearing signal within a preset time period may further include: monitoring the state of the motor bearing based on the circulating shaft current reduction amount and the circulating shaft current waveform corresponding to the motor bearing within a preset time period; wherein, the circulating shaft current is obtained from the motor shaft voltage with flux asymmetry or the motor shaft voltage generated by variable frequency power supply. As shown in Table 1, the classical circulating shaft current can be caused by the motor shaft voltage with flux asymmetry, and the high-frequency circulating shaft current can be caused by the motor shaft voltage generated by variable frequency power supply. As yet another example, the process of monitoring the state of the motor bearing based on the signal value reduction amount and the signal waveform of the motor bearing signal within a preset time period may further include: monitoring the state of the motor bearing based on the rotor ground fault shaft current reduction amount and the rotor ground fault shaft current waveform corresponding to the motor bearing within a preset time period; wherein, the rotor ground fault shaft current is formed under the condition that the impedance between the rotor and the ground is less than the impedance between the stator and the ground and the current flows along a preset path, and the preset path includes passing through the stator winding, the stator core, the motor bearing, the motor rotating shaft, and the ground point. As shown in Table 1, when the impedance Z 转子 is less than the impedance Z 定子 of the stator to the ground, part of the common-mode current can flow along the path of the stator winding - stator core - motor bearing - motor rotating shaft - ground to form the rotor ground fault shaft current. Since the characteristic of the rotor ground fault shaft current is that it requires the impedance Z 转子 <Z 定子It can only occur when the conditions are met. Therefore, when conducting electrical signal monitoring and analysis, based on the current characteristics corresponding to the three harmful shaft currents, with the mechanical spark discharge current and the circulating shaft current as the main focus, the condition monitoring of the motor bearing can be carried out. The specific monitoring process can be referred to the above description and will not be elaborated here.

[0024] In some exemplary embodiments, if the motor bearing is from the motor bearing in the new energy vehicle powertrain or the new energy vehicle hybrid box, the process of dynamically adjusting the lubricating oil flow rate of the motor bearing according to the condition monitoring result of the motor bearing may include: under the condition that the vehicle powertrain includes the motor bearing, transmitting the first potential difference and the second potential difference to the electronic control unit in the vehicle; wherein, the first potential difference is obtained based on the potential difference between the first voltage test point and the motor housing, the second potential difference is obtained based on the potential difference between the second voltage test point and the motor housing, the first voltage test point is located at one end of the motor shaft, and the second voltage test point is located on the motor bearing at the other end of the motor shaft; if the lubricating oil flow rate of the motor bearing at the current moment is less than the preset lubricating oil flow rate, the electronic control unit increases the pump speed according to the first potential difference and the second potential difference to increase the lubricating oil flow rate sprayed on the motor bearing. As an example, as Figure 4 shown, the test point a in Figure 4 can be used as the first voltage test point, and the test point b and / or the test point c in Figure 4 can be used as the second voltage test point. Then, the potential difference between the test point a and the motor housing can be used as the first potential difference, and the potential difference between the test point b and / or the test point c and the motor housing can be used as the second potential difference. Specifically, as Figure 4As shown, due to the high rotational speed of the motor in the hybrid powertrain of new energy vehicles and the high working load of the motor bearings, special lubricating oil nozzles are designed at the motor bearing positions to ensure the lubrication of the motor bearings. Therefore, test points a, b, and c for the electrical signals of the motor rotating shaft are added in the new energy powertrain. The potential differences between test point a and the motor housing, and between test points b / c and the motor housing are collected in real time and then transmitted to the electronic control unit ECU (Electric Control Unit, abbreviated as ECU). The electronic control unit ECU determines whether to issue an instruction to increase the rotational speed of the oil pump in the current vehicle based on the received potential differences. If during the operation of the vehicle, the electronic control unit ECU detects that the motor bearing current exceeds 0.2A and then rapidly drops to 0A, that is, the decrease in the motor bearing current within a preset time period is greater than the preset threshold of 0.2A, and the current waveform does not have a cosine waveform, at this time the electronic control unit ECU will issue an instruction so that the oil pump responds to this instruction and rapidly increases its rotational speed, increasing the lubricating oil flow rate sprayed on the motor bearings, thereby increasing the lubrication of the motor bearings. If during the operation of the vehicle, the electronic control unit ECU detects that the motor bearing current exceeds 0.2A and then rapidly drops to 0A, that is, the decrease in the motor bearing current within a preset time period is greater than the preset threshold of 0.2A, and the current waveform has a cosine waveform, at this time the electronic control unit ECU may not issue an instruction and maintain the current state.

[0025] In some exemplary embodiments, the motor bearing monitoring method may further include: obtaining the real-time lubricating oil flow rate of the motor bearings after increasing the lubricating oil flow rate; comparing the current rotational speed of the oil pump with the maximum rotational speed under the condition that the real-time lubricating oil flow rate is less than the preset lubricating oil flow rate; issuing a warning prompt message through the electronic control unit under the condition that the current rotational speed of the oil pump is equal to the maximum rotational speed; wherein the warning prompt message is used to prompt that the motor bearings are damaged or to prompt to replace the lubricating oil. In addition, under the condition that the current rotational speed of the oil pump is less than the maximum rotational speed, the current rotational speed of the oil pump can be first increased to the maximum rotational speed, and then the lubricating oil flow rate sprayed on the motor bearings is increased according to the maximum rotational speed. At the same time, the real-time lubricating oil flow rate of the motor bearings after increasing the lubricating oil flow rate is obtained again and compared with the preset lubricating oil flow rate. If the real-time lubricating oil flow rate obtained by increasing the lubricating oil flow rate sprayed on the motor bearings according to the maximum rotational speed is less than the preset lubricating oil flow rate, a warning prompt message is issued through the electronic control unit. Thus, it can be known that when the electronic oil pump has lubricated at the maximum flow rate, the electronic control unit ECU still determines that there is an electro-erosion situation through the analysis of the current motor bearing signals. At this time, the electronic control unit ECU needs to issue an alarm prompt, such as issuing an alarm prompt message for prompting to replace the lubricating oil or prompting that the motor bearings are damaged to the vehicle management personnel, so as to facilitate the vehicle management personnel to carry out maintenance as soon as possible and avoid greater losses caused by the continuous operation of the hybrid box. Among them, the vehicle management personnel can be vehicle drivers or other professional maintenance personnel.

[0026] In some exemplary embodiments, the method for monitoring an electric motor bearing may further include: obtaining the lowest rotational speed of an oil pump when mechanical spark discharge current or circulating shaft current appears under the conditions of a fixed rotational speed and torque; conducting a lubricating oil flow rate test on the electric motor bearing according to the lowest rotational speed of the oil pump, and adding the corresponding test data as a reference limit value to a database set in advance or in real time, and dynamically adjusting the lubricating oil flow rate of the electric motor bearing according to the reference limit value in the database. Specifically, the lowest rotational speed of the oil pump when mechanical spark discharge current or circulating shaft current appears under the conditions of a fixed rotational speed and torque can be obtained by conducting a hardware-in-the-loop bench test. Meanwhile, when conducting a lubricating oil flow rate test on the electric motor bearing according to the lowest rotational speed of the oil pump, the corresponding test data can be obtained by conducting a hardware-in-the-loop bench test. For example, when running the actual vehicle working condition spectrum on the bench, manually control the rotational speed of the electric oil pump and control the oil pumping flow rate. Then add the corresponding test data as a reference limit value to a database set in advance or in real time, so that during the actual operation of the vehicle, the electronic control unit (ECU) dynamically adjusts the lubricating oil flow rate of the electric motor bearing according to the actual operation conditions of the whole vehicle according to the reference limit value in the database, effectively avoiding the occurrence of electro-erosion.

[0027] In summary, the present application provides a method for monitoring an electric motor bearing. By obtaining the electric motor bearing signals collected in advance or in real time, and then based on the reduction amount of the signal values and the signal waveforms of the electric motor bearing signals within a preset time period, the state of the electric motor bearing is monitored, and the lubricating oil flow rate of the electric motor bearing is dynamically adjusted according to the state monitoring result of the electric motor bearing; wherein, the electric motor bearing signals include the electric motor bearing current, and the state monitoring result of the electric motor bearing includes that the lubricating oil flow rate of the electric motor bearing at the current moment is less than the preset lubricating oil flow rate. It can be seen that this method can monitor the state of the electric motor bearing in real time according to the electric motor bearing signals, and can also dynamically adjust the lubricating oil flow rate of the oil pump according to the state monitoring result of the electric motor bearing, thereby achieving precise lubrication and protection of the electric motor bearing. Therefore, this method can dynamically adjust the lubricating oil flow rate of the oil pump, improve the lubrication efficiency of the electric motor bearing, reduce the operating power consumption of the power assembly, and at the same time can also extend the service life of the electric motor bearing. In addition, if the electric motor bearing is applied to a vehicle power assembly, this method has a positive promoting effect on the development of the vehicle industry and has important practical application value. Moreover, for the vehicle industry, this method is simple to operate, low in cost, and more practical.

[0028] In another exemplary embodiment of the present application, as Figure 5 shown, this embodiment provides a system for monitoring an electric motor bearing, including: A signal acquisition module 510, configured to obtain the electric motor bearing signals collected in advance or in real time, and the electric motor bearing signals include the electric motor bearing current; The motor bearing monitoring module 520 is used to monitor the state of the motor bearing based on the signal value reduction and signal waveform of the motor bearing signal within a preset time period; wherein, the state monitoring result of the motor bearing includes that the lubricating oil flow rate of the motor bearing at the current moment is less than the preset lubricating oil flow rate. The dynamic adjustment module 530 is used to dynamically adjust the lubricating oil flow rate of the motor bearing according to the state monitoring result of the motor bearing.

[0029] It can be understood that the motor bearing monitoring system provided in the above embodiment and the motor bearing monitoring method provided in the above embodiment belong to the same concept. The specific manner of performing operations in the motor bearing monitoring method has been described in detail in the above embodiment and will not be elaborated here. In actual application, the motor bearing monitoring system provided in the above embodiment can, as needed, allocate the above functions to different functional modules, that is, divide the internal structure of the motor bearing monitoring system into different functional modules, and then implement all or part of the functions of the corresponding functional modules through the motor bearing monitoring method described in the above embodiment. For example, all or part of the functions of the acquisition module 510 can be implemented or executed through the relevant step processes of step S110, all or part of the functions of the motor bearing monitoring module 520 can be implemented or executed through the relevant step processes of step S120, and all or part of the functions of the dynamic adjustment module 530 can be implemented or executed through the relevant step processes of step S130. For the specific implementation or execution process, refer to the above embodiment and will not be specifically elaborated here.

[0030] Therefore, the present application provides a motor bearing monitoring system. The motor bearing signal is obtained in advance or in real time through the signal acquisition module, and then the motor bearing monitoring module monitors the state of the motor bearing based on the signal value reduction and signal waveform of the motor bearing signal within a preset time period. Finally, the dynamic adjustment module dynamically adjusts the lubricating oil flow rate of the motor bearing according to the state monitoring result of the motor bearing; wherein, the motor bearing signal includes the motor bearing current, and the state monitoring result of the motor bearing includes that the lubricating oil flow rate of the motor bearing at the current moment is less than the preset lubricating oil flow rate. It can be seen from this that this system can monitor the state of the motor bearing in real time according to the motor bearing signal, and can also dynamically adjust the lubricating oil flow rate of the oil pump according to the state monitoring result of the motor bearing, so as to achieve precise lubrication and protection of the motor bearing. Therefore, this system can dynamically adjust the lubricating oil flow rate of the oil pump, improve the lubrication efficiency of the motor bearing, reduce the operating power consumption of the power assembly, and at the same time extend the service life of the motor bearing. In addition, if the motor bearing is applied to a vehicle power assembly, this system has a positive promoting effect on the development of the vehicle industry and has important practical application value. Moreover, for the vehicle industry, this system is simple to operate, low in cost, and more practical.

[0031] In another exemplary embodiment of the present application, a computer device is further provided. The computer device may include a memory, a processor, and a computer program stored on the memory. The processor executes the computer program to cause the computer device to execute Figure 1 the steps of the motor bearing monitoring method described above. Figure 6 FIG. shows a schematic structural diagram of a computer device 1000. Refer to Figure 6 As shown, the computer device 1000 includes: a processor 1010, a memory 1020, a power supply 1030, a display unit 1040, and an input unit 1060.

[0032] The processor 1010 is the control center of the computer device 1000, connects various components through various interfaces and lines, and executes various functions of the computer device 1000 by running or executing computer programs / instructions stored in the memory 1020, thereby performing overall monitoring of the computer device 1000. In the embodiment of the present application, when the processor 1010 calls the computer program stored in the memory 1020, it executes the steps of Figure 1 the motor bearing monitoring method described above. Optionally, the processor 1010 may include one or more processing units; preferably, the processor 1010 may integrate an application processor and a modem processor. Among them, the application processor mainly processes the operating system, user interface, applications, etc., and the modem processor mainly processes wireless communication. In some embodiments, the processor and the memory may be implemented on a single chip, and in some embodiments, they may also be separately implemented on independent chips.

[0033] The memory 1020 may mainly include a program storage area and a data storage area. Among them, the program storage area may store an operating system, various applications, etc.; the data storage area may store instruction data created according to the use of the computer device 1000, etc. In addition, the memory 1020 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices, etc.

[0034] The computer device 1000 further includes a power supply 1030 (such as a battery) for powering each component. The power supply may be logically connected to the processor 1010 through a power management system, so as to manage functions such as charging, discharging, and power consumption through the power management system.

[0035] The display unit 1040 can be used to display information input by the user or information provided to the user, as well as various menus of the computer device 1000, etc. In the embodiments of the present application, it is mainly used to display the display interfaces of various applications in the computer device 1000 and objects such as text and pictures displayed in the display interfaces. The display unit 1040 may include a display panel 1050. The display panel 1050 can be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), etc.

[0036] The input unit 1060 can be used to receive information such as numbers or characters input by the user. The input unit 1060 may include a touch panel 1070 and other input devices 1080. Among them, the touch panel 1070, also known as a touch screen, can collect touch operations of the user on or near it (such as operations of the user using a finger, a stylus, or any suitable object or accessory on or near the touch panel 1070).

[0037] Specifically, the touch panel 1070 can detect the touch operation of the user, detect the signals brought by the touch operation, convert these signals into contact coordinates, send them to the processor 1010, and receive and execute the commands sent by the processor 1010. In addition, the touch panel 1070 can be implemented in multiple types such as resistive, capacitive, infrared, and surface acoustic wave. The other input devices 1080 may include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control keys, power on / off keys, etc.), a trackball, a mouse, a joystick, etc.

[0038] Of course, the touch panel 1070 can cover the display panel 1050. After the touch panel 1070 detects a touch operation on or near it, it is transmitted to the processor 1010 to determine the type of touch event. Subsequently, the processor 1010 provides a corresponding visual output on the display panel 1050 according to the type of touch event. Although in Figure 6 the touch panel 1070 and the display panel 1050 are implemented as two independent components to realize the input and output functions of the computer device 1000, in some embodiments, the touch panel 1070 and the display panel 1050 can be integrated to realize the input and output functions of the computer device 1000.

[0039] The computer device 1000 may further include one or more sensors, such as a pressure sensor, a gravitational acceleration sensor, a proximity light sensor, etc. Of course, according to the needs in specific applications, the above computer device 1000 may further include other components such as a camera.

[0040] In another exemplary embodiment of the present application, a computer-readable storage medium is further provided. A computer program / instructions are stored in the storage medium. When the computer program / instructions are executed by a processor, the above-mentioned device can execute the steps of the motor bearing monitoring method as described in Figure 1 the present application.

[0041] Those skilled in the art can understand that Figure 6 merely examples of computer devices are provided and do not constitute a limitation on the device. The device may include more or fewer components than shown in the figure, or combine certain components, or different components. For the convenience of description, the above parts are divided into various modules (or units) according to functions and described separately. Of course, when implementing the present application, the functions of the various modules (or units) can be implemented in the same or multiple software or hardware.

[0042] Those skilled in the art can understand that the present application can be implemented in the form of a computer program product on one or more computer-usable storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program codes. The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be applied to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks. These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks. These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0043] In another exemplary embodiment of the present application, a vehicle is further provided. The vehicle includes the motor bearing monitoring system described in the above embodiment or includes the computer device described in the above embodiment. It can be understood that since the specific manners in which the motor bearing monitoring system and the computer device perform operations have been described in detail in the embodiments, the technical functions and effects of the vehicle provided in this embodiment can be referred to the above embodiments, and will not be elaborated herein.

[0044] It can be understood that although terms such as first and second may be used in the embodiments of the present application to describe the potential difference, etc., these terms are only used to distinguish the potential differences from each other. For example, without departing from the scope of the embodiments of the present application, the first potential difference may also be referred to as the second potential difference, and similarly, the second potential difference may also be referred to as the first potential difference.

[0045] The above embodiments are only illustrative of the principles and effects of the present application, and are not intended to limit the present application. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present application should still be covered by the claims of the present application.

Claims

1. A motor bearing monitoring method, characterized in that: The method comprises the following steps: Acquire a motor bearing signal collected in advance or in real time, wherein the motor bearing signal includes a motor bearing current; The state of the motor bearing is monitored based on the signal value reduction and the signal waveform of the motor bearing signal within a preset time period, and the lubricating oil flow rate of the motor bearing is dynamically adjusted according to the state monitoring result of the motor bearing; wherein the state monitoring result of the motor bearing includes that the lubricating oil flow rate of the motor bearing at the current moment is less than the preset lubricating oil flow rate.

2. The motor bearing monitoring method according to claim 1, characterized in that: The process of monitoring the state of the motor bearing based on the signal value reduction and signal waveform of the motor bearing signal within a preset time period includes: Within a preset time period, when the decrease in the signal value of the motor bearing signal is greater than or equal to a preset threshold value, and when the signal waveform of the motor bearing signal is different from the preset waveform, the state monitoring result of the motor bearing is output as insufficient lubrication; under the condition of insufficient lubrication, the lubricating oil flow rate of the motor bearing at the current moment is less than the preset lubricating oil flow rate.

3. The motor bearing monitoring method according to claim 1 or 2, characterized in that: Based on the signal value reduction and signal waveform of the motor bearing signal within the preset time period, the process of monitoring the state of the motor bearing also includes: Based on the mechanical spark discharge current reduction amount and mechanical spark discharge current waveform corresponding to the motor bearing within a preset time period, the motor bearing is monitored in state; wherein the mechanical spark discharge current is formed under the condition that the lubricating oil film of the motor bearing is broken through by the motor shaft voltage, and the motor shaft voltage is formed based on the potential difference between the two ends of the motor shaft, the local part of the motor shaft, and the motor shaft to the ground; Alternatively, the motor bearing is monitored based on the decrease in the circulating shaft current corresponding to the motor bearing within a preset time period and the circulating shaft current waveform; wherein the circulating shaft current is obtained by the motor shaft voltage with asymmetric magnetic flux or the motor shaft voltage generated by variable frequency power supply; Alternatively, the state of the motor bearing is monitored based on the reduction in the rotor grounding shaft current corresponding to the motor bearing within a preset time period and the rotor grounding shaft current waveform; wherein the rotor grounding shaft current is formed under the condition that the rotor-to-ground impedance is less than the stator-to-ground impedance and the current flows along a preset path, and the preset path includes the stator winding, stator core, motor bearing, motor shaft and grounding point.

4. The motor bearing monitoring method according to claim 1 or 2, characterized in that: The process of dynamically adjusting the lubricating oil flow rate of the motor bearing according to the state monitoring result of the motor bearing includes: Under the condition that the vehicle powertrain includes the motor bearing, the first potential difference and the second potential difference are transmitted to an electronic control unit in the vehicle; wherein the first potential difference is obtained based on the potential difference between the first voltage test point and the motor housing, the second potential difference is obtained based on the potential difference between the second voltage test point and the motor housing, the first voltage test point is located at one end of the motor shaft, and the second voltage test point is located at the motor bearing at the other end of the motor shaft; If the lubricating oil flow rate of the motor bearing at the current moment is less than the preset lubricating oil flow rate, the oil pump speed is increased by the electronic control unit according to the first potential difference and the second potential difference to increase the lubricating oil flow rate sprayed on the motor bearing.

5. The motor bearing monitoring method according to claim 4, characterized in that: The method further comprises: Acquire the real-time lubricating oil flow rate of the motor bearing after the lubricating oil flow rate is increased; Under the condition that the real-time lubricating oil flow rate is less than the preset lubricating oil flow rate, comparing the current rotation speed of the oil pump with the maximum rotation speed; Under the condition that the current rotation speed of the oil pump is equal to the maximum rotation speed, the electronic control unit issues a warning prompt message; wherein the warning prompt message is used to prompt that the motor bearing is damaged or to prompt the replacement of lubricating oil.

6. The motor bearing monitoring method according to claim 3, characterized in that: The method further comprises: Obtain the minimum speed of the oil pump when mechanical spark discharge current or circulating shaft current occurs under the conditions of fixed speed and torque; The lubricating oil flow rate of the motor bearing is tested according to the minimum speed of the oil pump, and the corresponding test data is added as a reference limit to a pre- or real-time set database, and the lubricating oil flow rate of the motor bearing is dynamically adjusted according to the reference limit in the database.

7. A motor bearing monitoring system, characterized in that: The system comprises: A signal acquisition module, used to acquire a motor bearing signal acquired in advance or in real time, wherein the motor bearing signal includes a motor bearing current; A motor bearing monitoring module, used to monitor the state of the motor bearing based on the signal value reduction and signal waveform of the motor bearing signal within a preset time period; wherein the state monitoring result of the motor bearing includes that the lubricating oil flow rate of the motor bearing at the current moment is less than the preset lubricating oil flow rate; A dynamic adjustment module is used to dynamically adjust the lubricating oil flow of the motor bearing according to the state monitoring result of the motor bearing.

8. A computer device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the motor bearing monitoring method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed by a processor, the steps of the motor bearing monitoring method described in any one of claims 1 to 6 are implemented.

10. A vehicle, characterized in that: The vehicle comprises the motor bearing monitoring system according to claim 7 , or comprises the computer device according to claim 8 .

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