Hybrid power box lubricating oil quality detection method, system, equipment and medium

Abstract

The invention provides a hybrid power box lubricating oil quality detection method, system and device and a medium, the method is characterized in that an electric signal detection point is arranged on a motor rotating shaft, current and voltage data between the motor shaft and a shell are acquired in real time, and the detected current and the detected voltage are sent to an electronic control unit; the electronic control unit judges whether the quality state of the lubricating oil is normal or not based on the data, and if it is detected that the quality state of the lubricating oil is abnormal, an instrument panel is triggered to give an alarm and the motor is limited to output the rotating speed; according to the method, by detecting the quality state of the lubricating oil, resource waste caused by excessive and frequent replacement of the lubricating oil is avoided, and timely treatment can be ensured when the lubricating oil actually needs to be replaced, so that long-term stable operation of a vehicle is ensured.

Description

Technical Field

[0001] This application relates to the technical field of new energy vehicles, and particularly to a method, system, device and medium for detecting the quality of lubricating oil in a hybrid transmission case. Background Art

[0002] In the power system of new energy vehicles, as one of the key components, the hybrid transmission case not only undertakes the important responsibility of power conversion, but also has a direct impact on the overall performance and driving experience of the vehicle. The lubricating oil in the hybrid transmission case plays a crucial role in this process. Its function is not only to cool the internal components, but more importantly, to effectively lubricate the transmission components, reduce wear, and ensure the integrity of the oil film on the surface of the transmission components, which is crucial for maintaining the performance of the hybrid transmission case assembly and extending its service life.

[0003] However, during the long-term use of new energy vehicles, problems such as metal particles generated due to friction between transmission components, external impurities, and moisture that may enter the hybrid transmission case will inevitably occur. These substances will damage the oil film bearing capacity in the lubricating oil, thereby reducing the lubricating performance of the lubricating oil, and further affecting the working state and service life of the hybrid transmission case assembly. Currently, almost all new energy vehicles do not have a clear quantitative standard for the replacement of lubricating oil in the hybrid transmission case. In most cases, it is replaced regularly according to the specified mileage or the specified time interval of the vehicle. This method has certain limitations: on the one hand, it may lead to the replacement of the lubricating oil before it reaches its actual service life, causing unnecessary economic losses; on the other hand, if the lubricating oil has deteriorated but has not reached the predetermined replacement cycle, continuing to use this deteriorated lubricating oil may cause irreversible damage to the hybrid transmission case assembly, seriously affecting driving safety. Summary of the Invention

[0004] In view of the above-mentioned disadvantages of the prior art, this application provides a method, system, device and medium for detecting the quality of lubricating oil in a hybrid transmission case to solve the above technical problems.

[0005] A method for detecting the quality of lubricating oil in a hybrid transmission case provided by this application includes: obtaining the current and voltage between the electrical signal detection point and the motor shaft housing to obtain the detected current and detected voltage; sending the detected voltage and the detected current to an electronic control unit, so that the electronic control unit determines the quality state of the lubricating oil based on the detected current and the detected voltage, and the quality state includes normal and abnormal; when the quality state of the lubricating oil is abnormal, triggering a dashboard alarm and restricting the motor output speed.

[0006] In one embodiment of the present application, determining the quality state of the lubricating oil based on the detected current and the detected voltage includes: identifying the phase difference between the detected voltage and the detected current, and comparing the detected voltage with a preset voltage critical value; if the phase difference is less than a preset phase difference threshold and the detected voltage is less than or equal to the preset voltage critical value, it is determined that the quality state of the lubricating oil in the hybrid power box where the detected motor shaft is located is abnormal.

[0007] In one embodiment of the present application, determining the quality state of the lubricating oil based on the detected current and the detected voltage further includes: if the phase difference is less than a preset phase difference threshold and the detected voltage is greater than the preset voltage critical value; calculating the voltage difference between the current voltage and the previous voltage, where the current voltage and the previous voltage are the detected voltages obtained at the current electrical signal acquisition moment and the previous electrical signal acquisition moment respectively; if the voltage difference is greater than or equal to a preset voltage difference threshold, it is determined that the quality state of the lubricating oil in the hybrid power box where the detected motor shaft is located is abnormal.

[0008] In one embodiment of the present application, before obtaining the current and voltage between the electrical signal detection point and the motor shaft housing, the method further includes: setting a test experiment for testing the correlation between the quality state of the lubricating oil in the hybrid power box and the pollutant concentration, and conducting multiple groups of experiments to obtain experimental data; generating an experimental database based on the experimental data, where the experimental database includes the shaft voltage characteristic parameters corresponding to different pollutant concentrations; wherein, the test experiment includes: simulating the actual operating conditions of the vehicle, and adding pollutants to the lubricating oil in the hybrid power box based on a preset simulation rule; monitoring in real time the change state of the shaft voltage between the motor rotating shaft and the housing as the concentration of the pollutants increases; recording the critical point when the shaft voltage drops to a preset voltage threshold and the phase difference between the shaft voltage waveform and the current waveform is less than a preset phase difference threshold, and determining the critical point as a sign of the lubricating oil insulation failure.

[0009] In one embodiment of the present application, after obtaining the detected current and the detected voltage, the method further includes: determining the detected current and the detected voltage as the target current and the target voltage; identifying the target phase difference between the target current and the target voltage, and matching from the experimental database the shaft voltage characteristic parameters that are the same as the target phase difference; determining the lubricating oil quality stage based on the shaft voltage characteristic parameters, and predicting the remaining service life of the lubricating oil.

[0010] In an embodiment of the present application, the dashboard alarm is triggered and the motor output speed is restricted. Among them, the alarm strategy includes at least one of the following: triggering the fault warning light of the dashboard and restricting the maximum output speed of the motor by adjusting the control signal; continuously detecting the quality state of the lubricating oil. If the continuous duration of the abnormal quality state exceeds the preset duration, continuously reduce the maximum output speed of the motor until the motor output stops; generate a fault report and send the fault report to the vehicle maintenance system.

[0011] The present application provides a lubricating oil quality detection system for a hybrid transmission. The system is used to implement the lubricating oil quality detection method for the hybrid transmission as described above. The system includes: an electrical signal probe, which is arranged on the motor shaft and is used to collect the shaft voltage signal between the motor shaft and the housing; an electronic control unit, which receives the shaft voltage signal and judges the lubricating oil quality state based on the voltage amplitude and waveform phase; an alarm module, when the lubricating oil quality state detected by the electronic control unit is abnormal, triggers the dashboard warning light to alarm and restricts the motor output speed.

[0012] In an embodiment of the present application, the electrical signal probe is arranged at the bearing position of the motor shaft. The bearing position is designed with a lubricating oil nozzle to ensure the lubrication of the bearing of the motor shaft, and the quality state of the lubricating oil at the lubricating oil nozzle position is used to represent the overall lubricating oil quality state of the hybrid transmission.

[0013] The present application provides an electronic device. The electronic device includes: one or more processors; a storage device, which is used to store one or more programs. When the one or more programs are executed by the one or more processors, the electronic device implements the lubricating oil quality detection method for the hybrid transmission as described above.

[0014] The present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by the processor of the computer, the computer executes the lubricating oil quality detection method for the hybrid transmission as described above.

[0015] Advantages of the present application: The method for detecting the quality of the lubricating oil in the hybrid box of the present application aims to evaluate the quality status of the lubricating oil by monitoring the electrical signals of the motor shaft, ensuring the stable operation of the power system of new energy vehicles. The method first sets an electrical signal detection point on the motor rotating shaft to obtain the current and voltage data between the motor shaft and the housing in real time. These detected currents and detected voltages are then sent to the electronic control unit (ECU), and the ECU determines whether the quality status of the lubricating oil is normal based on these data. If the quality status of the lubricating oil is detected to be abnormal, that is, it indicates that the lubricating oil may have deteriorated or been contaminated, a dashboard alarm is triggered and the motor output speed is restricted to prevent further damage. On the one hand, this method can monitor the status of the lubricating oil in real time, and immediately issue an alarm and take restrictive measures when the quality of the lubricating oil drops to an abnormal level, thus effectively avoiding power system failures caused by lubricating oil deterioration and greatly improving the driving safety and reliability; on the other hand, it can accurately replace the lubricating oil according to the actual condition of the lubricating oil, avoiding waste of resources caused by unnecessary frequent replacement, and at the same time reducing the expensive maintenance costs caused by overdue replacement of the lubricating oil.

[0016] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. Brief Description of the Drawings

[0017] The drawings here are incorporated into the specification and constitute a part of this specification, showing embodiments in line with the present application, and are used together with the specification to explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0018] Figure 1 is a schematic diagram of the equivalent capacitance of the motor bearing shown in an exemplary embodiment of the present application;

[0019] Figure 2 is a schematic diagram of shaft voltage measurement shown in an exemplary embodiment of the present application;

[0020] Figure 3 is a schematic diagram of capacitive charge and discharge characteristics shown in an exemplary embodiment of the present application;

[0021] Figure 4 is a schematic diagram of capacitive breakdown discharge characteristics shown in an exemplary embodiment of the present application;

[0022] Figure 5 is a schematic diagram of the implementation environment of the method for detecting the quality of the lubricating oil in the hybrid box shown in an exemplary embodiment of the present application;

[0023] Figure 6It is a flowchart of a method for detecting the quality of lubricating oil in a hybrid transmission box shown in an exemplary embodiment of the present application;

[0024] Figure 7 It is a block diagram of a system for detecting the quality of lubricating oil in a hybrid transmission box shown in an exemplary embodiment of the present application;

[0025] Figure 8 It shows a schematic structural diagram of a computer system of an electronic device suitable for implementing the embodiments of the present application.

[0026] Reference numerals:

[0027] 1 - bearing housing; 2 - insulating gasket; 3 - metal gasket; 4 - insulating gasket; 5 - rotor; U1 voltage at both ends of the rotating shaft; U2 bearing oil film voltage; U3 voltage of the bearing housing to the ground; U4 voltage of the rotor to the ground. Detailed implementation manners

[0028] The following will describe the embodiments of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for explaining the present application, rather than for limiting the protection scope of the present application.

[0029] It should be noted 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 type, number, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0030] In the following description, a large number of details are discussed to provide a more thorough explanation of the embodiments of the present application. However, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present application difficult to understand.

[0031] First of all, it should be noted that there are oil films between the inner and outer rings and the rollers at the bearing position of the motor shaft in the hybrid transmission box. Similar to a capacitive medium, the inner and outer rings of the bearing and the rollers form capacitor plates with each other and are in a non-conductive state. Its structure can be simplified as Figure 1As shown. Moreover, when the new energy hybrid box assembly is operating, an axial voltage will be generated on the motor shaft. According to the definition, the axial voltage is the potential difference between the two ends of the motor shaft, the local part of the rotating shaft, and the rotating shaft to the ground. The specific voltage measurement schematic diagram is as Figure 2 shown, where the potential difference U2 between the inner and outer rings of the motor shaft bearing is the bearing oil film voltage. According to the national standard, the axial voltage shall not be greater than 0.5V (rms). U2 is mainly the potential difference generated by variable frequency power supply. In essence, it is an alternating current. Combining with the equivalent capacitance on the bearing, a simple AC circuit is formed.

[0032] Therefore, when the lubricating oil has good quality and the equivalent capacitance dielectric has good insulation, and the voltage across the capacitor is U2, the circuit formed at this time is a pure capacitance circuit, and U2 presents the characteristic waveform of capacitive charge and discharge (as Figure 3 shown). The capacitance impedance is calculated as Z = 1 / (jωC) in units of Ω. Then the current I is calculated based on the extended Ohm's law I = U / Z, and it presents the characteristic waveform of capacitive charge and discharge like U2, and there is a 90° phase difference between the two waveforms.

[0033] When the metal micro-particle impurities, moisture, etc. in the lubricating oil gradually increase, the quality of the lubricating oil decreases, the insulation of the capacitor dielectric served by the lubricating oil decreases, and the bearing equivalent capacitance load capacity gradually decreases. When the voltage U2 across the capacitor exceeds the capacitance load capacity, a breakdown phenomenon will occur. After breakdown, the capacitor is approximately a conductor and only has a tiny resistance. Then after breakdown, U2 drops to 0V and fluctuates, and the voltage no longer has the characteristics of a wave. The waveform diagram presents the characteristic of capacitive breakdown discharge (as Figure 4 shown). The circuit formed by the voltage U2 and the breakdown capacitor is a pure resistance circuit. The current is calculated according to Ohm's law I = U / R, and the resistance R is a conductor with a tiny resistance. And the current waveform is in the same phase as the voltage waveform.

[0034] Therefore, based on the foregoing principle, the present application proposes a method for detecting the quality of the lubricating oil in a hybrid box. This method first sets an electrical signal detection point on the motor shaft to obtain the current and voltage data between the motor shaft and the housing in real time; then, based on the voltage data and current data, the quality state of the lubricating oil is identified, and a series of subsequent operations such as alarm or restricting the motor speed are performed according to the identification result.

[0035] Figure 5 is a schematic diagram of the implementation environment of the method for detecting the quality of the lubricating oil in a hybrid box shown in an exemplary embodiment of the present application.

[0036] As Figure 5As shown in the figure, the implementation environment of the hybrid box lubricating oil quality detection method includes a data acquisition module 501 and a computer device 502. Among them, the data acquisition module 501 is installed inside the hybrid box of a new energy vehicle, specifically near the motor shaft. This module includes an electrical signal probe for collecting the current and voltage signals of the motor shaft relative to the housing in real time. The current and voltage signals collected by it represent the electrical characteristic changes between the motor shaft and the housing, directly reflecting the quality state of the lubricating oil. For example, when there are excessive metal particles, impurities or moisture in the lubricating oil, it will cause a change in the voltage value between the motor shaft and the housing. The data acquisition module 501 sends the collected current and voltage information to the computer device 502 through the in-vehicle communication network (such as CAN bus) for further analysis.

[0037] The computer device 502 usually refers to the electronic control unit (ECU) in the vehicle. It receives the data from the data acquisition module 501 and processes and analyzes these data based on a preset algorithm to determine the quality state (normal or abnormal) of the lubricating oil. Once the ECU determines that the lubricating oil quality is abnormal (for example, the shaft voltage U2 drops to 0V and the voltage waveform is in the same phase as the current waveform), it will immediately trigger an alarm and prompt the driver through the dashboard warning light; at the same time, the ECU will also limit the motor output speed to prevent further damage caused by poor-quality lubricating oil. In addition, in order to more accurately evaluate the lubricating oil quality, the ECU has a failure model database built in, which contains shaft voltage data under different lubricating oil quality states to provide more scientific and reasonable replacement suggestions.

[0038] It can be understood that in the implementation environment as shown in Figure 5 the figure, the data acquisition module 501 closely cooperates with the motor shaft to ensure that it can accurately capture the electrical signal changes caused by the lubricating oil quality change; while the computer device 502 serves as the data analysis and decision-making center, using its computing power and database resources to quickly respond and take necessary protection measures. The two are connected through an efficient communication mechanism, jointly constituting a complete hybrid box lubricating oil quality monitoring system, aiming to ensure the safe and efficient operation of new energy vehicles.

[0039] As shown in Figure 6 the figure, in an exemplary embodiment, the hybrid box lubricating oil quality detection method at least includes steps S610 to S630, which are introduced in detail as follows:

[0040] Step S610, obtain the current and voltage between the electrical signal detection point and the motor shaft housing to obtain the detected current and the detected voltage.

[0041] In an embodiment of the present application, a bearing position designed with a lubricating oil nozzle on the motor shaft is selected as a specific position, and a high-precision electrical signal probe is installed at this specific position. Further, the electrical signal probe is connected to an electronic control unit (ECU) through a special cable. At the same time, a fixed reference point is selected on the motor shaft housing as the ground connection point to ensure that the measured electrical signal data is the voltage value relative to the housing.

[0042] When the new energy vehicle is running, the electrical signal probe starts to work, and in real time, it collects the current and voltage signals of the motor shaft relative to the housing. Then, it performs preliminary filtering on the collected current and voltage signals to remove high-frequency noise and other interference factors. After that, the filtered signals are transmitted to the ECU, so that the ECU calculates specific detection current and detection voltage values according to the built-in algorithm, and these data are used to evaluate the quality state of the lubricating oil.

[0043] Step S620: Send the detected voltage and detected current to the electronic control unit, so that the electronic control unit determines the quality state of the lubricating oil based on the detected current and detected voltage. The quality state includes normal and abnormal.

[0044] In an embodiment of the present application, inside the ECU, first, the received original signal is preprocessed. This includes filtering operations to remove noise, amplifying weak signals, and analog-to-digital conversion to convert analog signals into digital signals for subsequent processing. In addition, a specially designed data analysis algorithm is included inside the ECU to evaluate the quality state of the lubricating oil according to the change patterns of the detected current and detected voltage. This algorithm compares the current measured values with a preset normal operating range. Then, according to the analysis results, the ECU classifies the quality state of the lubricating oil as "normal" or "abnormal". Specifically, if both the detected voltage and current are within the normal range and no abnormal waveform features appear (such as the shaft voltage U2 not dropping to 0V and the voltage and current waveform phases being inconsistent), it is determined that the lubricating oil quality is "normal"; if it is found that the shaft voltage U2 drops to 0V and the voltage waveform is in the same phase as the current waveform, or other abnormal conditions are detected (such as the metal particle content exceeding 0.01% or the water content exceeding 0.1%), it is determined that the lubricating oil quality is "abnormal". Among them, the preset normal operating range is established based on laboratory tests or historical data, and the present application does not impose any restrictions on the specific values and determination methods of the "normal operating range" data.

[0045] It can be understood that through the method proposed in this embodiment, the quality of the lubricating oil of the motor shaft can be monitored in real time. Moreover, since the quality change state of the lubricating oil of the motor shaft can be equivalent to the quality change state of the lubricating oil of the hybrid power box. Therefore, based on the method proposed in this embodiment, the quality state of the lubricating oil of the hybrid power box can be monitored in real time, so as to propose corresponding measures based on its quality change state, such as alarming, restricting the motor output, and replacing the lubricating oil, etc.

[0046] Step S630, when the quality state of the lubricating oil is abnormal, trigger the dashboard alarm and limit the motor output speed.

[0047] In an embodiment of the present application, triggering the dashboard alarm and limiting the motor output speed includes at least one of the following: triggering the fault warning light of the dashboard and restricting the maximum output speed of the motor by adjusting the control signal; continuously detecting the quality state of the lubricating oil, if the continuous duration of the abnormal quality state exceeds the preset duration, then continuously reduce the maximum output speed of the motor until the motor output stops; generating a fault report and sending the fault report to the vehicle maintenance system.

[0048] In a specific embodiment of the present application, when the quality state of the lubricating oil is determined to be "abnormal", the ECU immediately activates the alarm system on the dashboard. The specific operations include: triggering the dedicated warning light on the dashboard, such as the red fault light is on, to visually prompt the driver to pay attention to the current problem; optionally, the driver can also be further reminded by a sound alarm or other forms of notification (such as a pop-up message of the in-vehicle infotainment system).

[0049] In another specific embodiment of the present application, while triggering the alarm, the ECU sends an instruction to the motor control system to require restricting the maximum output speed of the motor to reduce the risk of power system wear caused by lubricating oil failure. In addition, the ECU can adjust the degree of restriction according to the specific situation. For example, the maximum speed of the motor can be restricted within a safe range (such as 50%-70% of the original design maximum speed), ensuring that the vehicle can still maintain the basic driving function but reducing the potential mechanical damage risk.

[0050] In another specific embodiment of the present application, the ECU records all relevant data regarding the abnormal quality state of the lubricating oil, including information such as timestamps and specific parameter values detected. This relevant data can be used for subsequent maintenance inspections or fault troubleshooting. Additionally, the fault information can also be transmitted to external devices or service centers through the on-board diagnostic system (OBD) interface for remote monitoring and service support. Moreover, after triggering an alarm, in addition to the physical warning, the ECU can also provide specific guidance and suggestions to the driver through the in-vehicle infotainment system, such as suggesting to go to the nearest service center to replace the lubricating oil as soon as possible, or elaborating on the purpose and impact of the current restriction measures.

[0051] It can be understood that the method proposed based on the above embodiments can not only respond quickly when the quality of the lubricating oil is abnormal, ensuring the safety and reliability of driving, but also take effective preventive measures to avoid more serious mechanical damage caused by the failure of the lubricating oil.

[0052] In an embodiment of the present application, determining the quality state of the lubricating oil based on the detected current and detected voltage includes: identifying the phase difference between the detected voltage and the detected current, and comparing the detected voltage with a preset voltage critical value; if the phase difference is less than a preset phase difference threshold and the detected voltage is less than or equal to the preset voltage critical value, it is determined that the quality state of the lubricating oil in the hybrid power box where the detected motor shaft is located is abnormal.

[0053] In a specific embodiment of the present application, a high-precision electrical signal probe is installed on the motor shaft to collect the detected voltage and detected current of the motor shaft relative to the housing in real time, and these signals are transmitted to the electronic control unit (ECU) through a shielded cable. Subsequently, the ECU calculates the phase difference between the detected voltage and the detected current, compares it with the preset phase difference threshold, and at the same time compares the detected voltage with the preset voltage critical value. If the phase difference is less than the preset phase difference threshold and the detected voltage is less than or equal to the preset voltage critical value, it is determined that the quality state of the lubricating oil is "abnormal". Among them, the preset phase difference threshold and the preset voltage critical value are standard values set based on experimental data and practical application experience, which can effectively reflect whether the lubricating oil deteriorates due to contaminants such as moisture and metal particles. Once it is determined that the quality state of the lubricating oil is "abnormal", the ECU will immediately trigger response measures, such as lighting the red fault light on the dashboard, emitting a sound alarm, and restricting the motor output speed to prevent further damage to the power system.

[0054] It can be understood that in the actual application process, the preset phase difference threshold can be 0°, and the preset voltage critical value is 0V, that is, when the detected current and the detected voltage are in the same phase and the detected voltage is less than or equal to 0V, it is determined that the quality state of the lubricating oil is "abnormal". In addition, through the above method, the present invention realizes the precise monitoring and timely warning of the quality state of the lubricating oil, significantly improves the safety and reliability of the vehicle, and at the same time optimizes the maintenance cost and resource utilization efficiency.

[0055] In an embodiment of the present application, determining the quality state of the lubricating oil based on the detected current and the detected voltage further includes: when the phase difference is less than the preset phase difference threshold and the detection is greater than the preset voltage critical value; calculating the voltage difference between the current voltage and the previous voltage, where the current voltage and the previous voltage are the detected voltages obtained at the current electrical signal acquisition moment and the previous electrical signal acquisition moment respectively; if the voltage difference is greater than or equal to the preset voltage difference threshold, it is determined that the quality state of the lubricating oil in the hybrid power box where the detected motor shaft is located is abnormal.

[0056] In a specific embodiment of the present application, the ECU first calculates the phase difference between the detected voltage and the detected current and compares it with the preset phase difference threshold. At the same time, the ECU also compares the detected voltage with the preset voltage critical value. If the phase difference is less than the preset phase difference threshold and the detected voltage is greater than the preset voltage critical value, then enter the next step of analysis: for each new electrical signal acquisition moment, the ECU records the current detected voltage as the "current voltage" and the detected voltage obtained at the previous electrical signal acquisition moment as the "previous voltage"; then calculates the voltage difference between the current voltage and the previous voltage. Compare the calculated voltage difference with the preset voltage difference threshold. If the voltage difference is greater than or equal to the preset voltage difference threshold, this indicates that a significant voltage drop has occurred in a short period of time, which may be due to the emergence of new contaminants in the lubricating oil or the deterioration of the insulation performance caused by the increase in the concentration of existing contaminants. It should be noted that the preset voltage difference threshold is a standard value set according to experimental data and historical experience, used to distinguish normal fluctuations and sharp changes that may have problems. The present application does not make any specific restrictions on its specific value and determination method.

[0057] In summary, when all of the following conditions are met, the ECU determines that the quality state of the lubricating oil in the hybrid power box where the detected motor shaft is located is "abnormal":

[0058] Phase difference < preset phase difference threshold;

[0059] Detected voltage > preset voltage critical value;

[0060] Voltage difference ≥ preset voltage difference threshold.

[0061] Once it is determined that the quality status of the lubricating oil is "abnormal", the ECU will immediately take a series of response measures, including but not limited to: triggering the alarm system on the dashboard, such as lighting up the red fault light and emitting an audible alarm. Sending instructions to limit the motor output speed to prevent further damage to the power system

[0062] In an embodiment of the present application, before obtaining the current and voltage between the electrical signal detection point and the motor shaft housing, the method further includes: setting a test experiment for testing the correlation between the quality status of the lubricating oil in the hybrid power box and the pollutant concentration, and conducting multiple groups of experiments to obtain experimental data; generating an experimental database based on the experimental data, where the experimental database includes the shaft voltage characteristic parameters corresponding to different pollutant concentrations; wherein, the test experiment includes: simulating the actual operating conditions of the vehicle, and adding pollutants to the lubricating oil in the hybrid power box based on a preset simulation rule; real-time monitoring the change state of the shaft voltage between the motor rotating shaft and the housing with the increase in the concentration of pollutants; recording the critical point when the shaft voltage drops to a preset voltage threshold and the phase difference between the shaft voltage waveform and the current waveform is less than a preset differential phase threshold, and determining the critical point as a sign of the failure of the lubricating oil insulation

[0063] In a specific embodiment of the present application, to accurately evaluate the quality status of the lubricating oil in the hybrid power box of a new energy vehicle and establish a scientific and reasonable replacement strategy, the present invention provides a detailed implementation method based on experimental tests. First, before obtaining the current and voltage between the electrical signal detection point and the motor shaft housing, a series of test experiments are set up to study the correlation between the quality status of the lubricating oil in the hybrid power box and the pollutant concentration. This experiment is usually carried out in a hardware-in-the-loop bench test environment, which can simulate the actual operating conditions of the vehicle and precisely control various operating parameters

[0064] During the experiment, different types of pollutants, such as metal microparticles or moisture, are gradually added to the pure lubricating oil in the hybrid power box according to a preset rule. After each addition, it is necessary to stir well to ensure uniform distribution, and the concentration range of pollutants should cover various situations that may be encountered in actual use. Subsequently, under the simulated actual operating conditions, the change of the shaft voltage between the motor rotating shaft and the housing is real-time monitored by using a high-precision electrical signal probe installed on the motor rotating shaft. As the concentration of pollutants gradually increases, the change trend of the shaft voltage and its phase difference from the current waveform are continuously recorded. Generally, when the content of metal microparticles is greater than 0.01% or the water content is greater than 0.1%, the insulation performance of the lubricating oil significantly decreases

[0065] When it is detected that the shaft voltage drops to a preset voltage threshold (e.g., 0V), and the phase difference between the shaft voltage waveform and the current waveform is less than a preset phase difference threshold, record the pollutant concentration, shaft voltage value, and phase difference information at this time. This critical point is regarded as a sign of the failure of the lubricating oil insulation, indicating that the lubricating oil can no longer effectively protect the transmission components from wear and other damages. By sorting and analyzing multiple sets of experimental data, an experimental database is constructed, which contains key information such as pollutant types, concentration levels, shaft voltage change trend charts, and specific values of the critical points.

[0066] In addition, based on the data in the experimental database, an algorithm model is developed to predict the quality state of the lubricating oil at a given pollutant concentration. By comparing the results under different experimental conditions, the algorithm model is optimized to improve its accuracy and reliability. In addition, an additional experimental data set is used to verify the algorithm model to ensure that it can work stably under different operating conditions. Adjust the experimental parameters and model parameters according to the verification results to further improve the experimental database and the algorithm model.

[0067] In an embodiment of the present application, after obtaining the detected current and the detected voltage, the method further includes: determining the detected current and the detected voltage as the target current and the target voltage; identifying the target phase difference between the target current and the target voltage, and matching from the experimental database to obtain the shaft voltage characteristic parameters that are the same as the target phase difference; determining the lubricating oil quality stage based on the shaft voltage characteristic parameters, and predicting the remaining service life of the lubricating oil.

[0068] In a specific embodiment of the present application, to accurately evaluate the quality state of the lubricating oil in the hybrid power box of a new energy vehicle and predict its remaining service life, the present invention provides a method for matching and analyzing based on an experimental database. First, a high-precision electrical signal probe is installed on the motor shaft to real-time collect the detected current and the detected voltage of the motor shaft relative to the housing, and transmit these signals to the electronic control unit (ECU) through a shielded cable. After receiving the original data, the ECU defines it as the target current and the target voltage for subsequent analysis.

[0069] Subsequently, the ECU calculates the phase difference between the target current and the target voltage, that is, the target phase difference. This phase difference reflects the change in the electrical characteristics of the current lubricating oil under actual operating conditions and is an important indicator for judging the state of the lubricating oil. Then, the ECU searches the previously established experimental database for the shaft voltage characteristic parameters that are closest to or the same as this phase difference according to the calculated target phase difference. The experimental database contains the shaft voltage characteristic parameters corresponding to different pollutant concentration conditions, as well as information on different lubricating oil quality stages corresponding to each parameter.

[0070] Based on the matched shaft voltage characteristic parameters, the ECU determines the quality stage of the current lubricating oil. For example, if the matching result shows that the shaft voltage drops and the phase difference between the waveform and the current waveform is less than the preset threshold, it indicates that the lubricating oil may have entered the deterioration stage.

[0071] Furthermore, by using the matched shaft voltage characteristic parameters, combined with historical data and model algorithms, the ECU can predict the remaining service life of the lubricating oil. The prediction model comprehensively considers various factors, such as pollutant type, concentration growth trend, and vehicle mileage, etc., to give a relatively accurate estimate of the remaining service life. In addition, the ECU can provide the driver with the recommended time to replace the lubricating oil according to the prediction result, avoiding power system failures caused by lubricating oil failure.

[0072] Finally, the ECU records all relevant data, including timestamp, target current, target voltage, target phase difference, the matched shaft voltage characteristic parameters and their corresponding life stages, the predicted remaining service life, etc., and stores them in a log file for subsequent analysis. This relevant data not only helps to optimize the maintenance strategy but also provides a basis for future improvements.

[0073] It can be understood that through the above continuous steps, the precise monitoring and scientific evaluation of the lubricating oil quality state are achieved, significantly improving the safety and reliability of the vehicle, while reducing the maintenance cost, which has important application value.

[0074] Figure 7 is a block diagram of a lubricating oil quality detection device for a hybrid box shown in an exemplary embodiment of the present application. This device can be applied to Figure 5 the shown implementation environment. This device can also be applicable to other exemplary implementation environments and is specifically configured in other devices. This embodiment does not limit the implementation environment applicable to this device.

[0075] As Figure 7 shown, this exemplary lubricating oil quality detection device for a hybrid box includes: an electrical signal probe 710, an electronic control unit 720, and an alarm module 730.

[0076] The electrical signal probe 710 is arranged on the motor shaft and is used to collect the shaft voltage signal between the motor shaft and the housing; the electronic control unit 720 receives the shaft voltage signal and judges the lubricating oil quality state based on the voltage amplitude and waveform phase; the alarm module 730 triggers the dashboard warning light to alarm and limits the motor output speed when the lubricating oil quality state of the electronic control unit is abnormal.

[0077] In one embodiment of the present application, the electrical signal probe is disposed at the bearing position of the motor rotating shaft. The bearing position is designed with a lubricating oil nozzle to ensure the lubrication of the bearing of the motor rotating shaft, and the quality state of the lubricating oil at the lubricating oil nozzle position is used to represent the overall lubricating oil quality state of the hybrid power box.

[0078] It should be noted that the hybrid power box lubricating oil quality detection device provided in the above embodiment and the hybrid power box lubricating oil quality detection method provided in the above embodiment belong to the same concept. The specific manners in which each module and unit perform operations have been described in detail in the method embodiment, and will not be elaborated here. In actual application, the hybrid power box lubricating oil quality detection device provided in the above embodiment can, according to needs, allocate the above functions to different functional modules, that is, divide the internal structure of the device into different functional modules to complete all or part of the functions described above. This is not limited here either.

[0079] An embodiment of the present application also provides an electronic device, including: one or more processors; a storage device for storing one or more programs, which, when executed by the one or more processors, cause the electronic device to implement the hybrid power box lubricating oil quality detection method provided in each of the above embodiments.

[0080] Figure 8 The structural schematic diagram of a computer system of an electronic device suitable for implementing the embodiments of the present application is shown. It should be noted that Figure 8 The computer system 800 of the electronic device shown is only an example and should not impose any limitation on the functions and usage scope of the embodiments of the present application.

[0081] As Figure 8 shown, the computer system 800 includes a central processing unit (CPU) 801, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 802 or the program loaded from the storage section 808 into the random access memory (RAM) 803, such as executing the method described in the above embodiment. In the RAM 803, various programs and data required for system operation are also stored. The CPU 801, ROM 802, and RAM 803 are connected to each other through a bus 804. The input / output (I / O) interface 805 is also connected to the bus 804.

[0082] The following components are connected to the I / O interface 805: an input section 806 including a keyboard, a mouse, etc.; an output section 807 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc. and a speaker, etc.; a storage section 808 including a hard disk, etc.; and a communication section 809 including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication section 809 performs communication processing via a network such as the Internet. A drive 810 is also connected to the I / O interface 805 as required. A removable medium 811 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc. is mounted on the drive 810 as required so that a computer program read therefrom is installed into the storage section 808 as required.

[0083] Specifically, according to an embodiment of the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, an embodiment of the present application includes a computer program product including a computer program carried on a computer-readable medium, the computer program including a computer program for performing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via the communication section 809, and / or installed from the removable medium 811. When the computer program is executed by a central processing unit (CPU) 801, various functions defined in the system of the present application are executed.

[0084] It should be noted that the computer-readable medium shown in the embodiments of the present application can be a computer-readable signal medium, a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable computer program. Such a propagated data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The computer program contained on the computer-readable medium can be transmitted using any appropriate medium, including but not limited to: wireless, wired, etc., or any suitable combination of the above.

[0085] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of the present application. Among them, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and the above module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than marked in the accompanying drawings. For example, two consecutive blocks shown may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram or flowchart, and the combination of blocks in the block diagram or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0086] The units involved in the embodiments described in this application can be implemented in software or in hardware, and the described units can also be provided in a processor. Among them, the names of these units do not, in some cases, constitute a limitation on the unit itself.

[0087] Another aspect of this application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor of the computer, the computer is caused to execute the hybrid gearbox lubricating oil quality detection method as described above. The computer-readable storage medium can be included in the electronic device described in the above embodiments, or can exist alone without being assembled into the electronic device.

[0088] Another aspect of this application also provides a computer program product or a computer program. The computer program product or the computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the hybrid gearbox lubricating oil quality detection method provided in the above various embodiments.

[0089] The above embodiments are only used to exemplarily illustrate the principles and effects of this application, rather than to limit this application. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in this application should still be covered by the claims of this application.

Claims

1. A method for detecting the quality of lubricating oil in a hybrid transmission, characterized in that, The method includes: Obtaining the current and voltage between the electrical signal detection point and the motor shaft housing to obtain the detected current and the detected voltage; Sending the detected voltage and the detected current to an electronic control unit so that the electronic control unit determines the quality state of the lubricating oil based on the detected current and the detected voltage, and the quality state includes normal and abnormal; When the quality state of the lubricating oil is abnormal, trigger a dashboard alarm and limit the motor output speed.

2. The method for detecting the quality of the lubricating oil of the hybrid transmission according to claim 1, characterized in that Determining the quality state of the lubricating oil based on the detected current and the detected voltage includes: Identifying the phase difference between the detected voltage and the detected current, and comparing the detected voltage with a preset voltage critical value; If the phase difference is less than a preset phase difference threshold and the detected voltage is less than or equal to the preset voltage critical value, it is determined that the quality state of the lubricating oil in the hybrid box where the detected motor shaft is located is abnormal.

3. The method for detecting the quality of the lubricating oil of the hybrid transmission according to claim 2, wherein, Determining the quality state of the lubricating oil based on the detected current and the detected voltage further includes: If the phase difference is less than a preset phase difference threshold and the detected voltage is greater than the preset voltage critical value; Calculating the voltage difference between the current voltage and the previous voltage, where the current voltage and the previous voltage are the detected voltages obtained at the current electrical signal acquisition time and the previous electrical signal acquisition time respectively; If the voltage difference is greater than or equal to a preset voltage difference threshold, it is determined that the quality state of the lubricating oil in the hybrid box where the detected motor shaft is located is abnormal.

4. The method for detecting the quality of the lubricating oil of the hybrid gearbox according to claim 1, wherein, Before obtaining the current and voltage between the electrical signal detection point and the motor shaft housing, the method further includes: Setting a test experiment for testing the correlation between the quality state of the lubricating oil in the hybrid box and the pollutant concentration, and conducting multiple groups of experiments to obtain experimental data; Generating an experimental database based on the experimental data, where the experimental database includes shaft voltage characteristic parameters corresponding to different pollutant concentrations; Wherein, the test experiment includes: Simulating the actual operating conditions of the vehicle and adding pollutants to the lubricating oil in the hybrid box based on a preset simulation rule; Real-time monitoring the change state of the shaft voltage between the motor rotating shaft and the housing as the concentration of the pollutant increases; Recording the critical point when the shaft voltage drops to a preset voltage threshold and the phase difference between the shaft voltage waveform and the current waveform is less than a preset difference phase threshold, and determining the critical point as a sign of lubricating oil insulation failure.

5. The method for detecting the quality of the lubricating oil of the hybrid transmission according to claim 4, wherein, After obtaining the detected current and the detected voltage, the method further includes: Determining the detected current and the detected voltage as the target current and the target voltage; Identifying the target phase difference between the target current and the target voltage, and matching the shaft voltage characteristic parameter identical to the target phase difference from the experimental database; Determining the lubricating oil quality stage based on the shaft voltage characteristic parameter and predicting the remaining service life of the lubricating oil.

6. The method for detecting the quality of the lubricating oil of the hybrid gearbox according to any one of claims 1-5, characterized in that, Triggering a dashboard alarm and limiting the motor output speed, where the alarm strategy includes at least one of the following: Triggering the fault warning light on the dashboard and limiting the maximum output speed of the motor by adjusting the control signal; Continuously detecting the quality state of the lubricating oil. If the duration of the abnormal quality state exceeds a preset duration, continuously reduce the maximum output speed of the motor until the motor output stops. Generate a fault report and send the fault report to the vehicle maintenance system.

7. A quality detection system for the lubricating oil of a hybrid transmission, characterized in that, The system is used to implement the hybrid transmission lubricating oil quality detection method according to any one of claims 1-6. The system includes: An electrical signal probe, which is arranged on the motor rotating shaft and is used to collect the shaft voltage signal between the motor rotating shaft and the housing. An electronic control unit, which receives the shaft voltage signal and judges the lubricating oil quality state based on the voltage amplitude and waveform phase. An alarm module, when the lubricating oil quality state of the electronic control unit is abnormal, triggers the dashboard warning light to alarm and limits the motor output speed.

8. The hybrid transmission lubricating oil quality detection system according to claim 7, wherein The electrical signal probe is arranged at the bearing position of the motor rotating shaft. The bearing position is designed with a lubricating oil nozzle, and the quality state of the lubricating oil at the lubricating oil nozzle position is used to represent the overall lubricating oil quality state of the hybrid transmission.

9. An electronic device, characterized in that, The electronic device includes: One or more processors; A storage device, which is used to store one or more programs. When the one or more programs are executed by the one or more processors, the electronic device realizes the hybrid transmission lubricating oil quality detection method according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that, A computer program is stored thereon. When the computer program is executed by the processor of the computer, the computer executes the hybrid transmission lubricating oil quality detection method according to any one of claims 1 to 6.

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