Evaluation method and device for vehicle lubricating oil, vehicle and storage medium

Abstract

The invention relates to the technical field of vehicles, in particular to a vehicle lubricating oil evaluation method and device, a vehicle and a storage medium, and the method comprises the steps: obtaining a current mileage accumulated value of the vehicle, and matching a target evaluation function set of lubricating oil, calculating an estimation index parameter of the lubricating oil under each quality grade by utilizing the target evaluation function set and the at least one current environment parameter; and based on the current index parameter of the lubricating oil, extracting the estimation index parameter meeting a preset error condition from the estimation index parameters under each quality grade to determine a target index parameter, and generating an evaluation result of the lubricating oil. The function set used for analyzing the lubricating oil state can be confirmed according to the actual mileage condition of the vehicle engine, the deterioration degree of the lubricating oil is judged according to the current state of the engine and the physical and chemical indexes of the lubricating oil, efficient and accurate monitoring of the lubricating oil state is achieved, and therefore stable and safe work of the engine is guaranteed; the device is more convenient and practical.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a method and device for evaluating vehicle lubricating oil, a vehicle and a storage medium. Background Art

[0002] The good quality of lubricants is particularly important for the normal operation of vehicle transmission systems. Failure to replace high-quality lubricants in a timely manner may cause insufficient lubrication of parts and excessive wear of parts, thereby reducing their service life and even affecting the stability and safety of vehicle driving.

[0003] In the related art, the oil can be changed regularly after the vehicle has traveled a certain mileage, or the vehicle lubricant can be sampled and the quality of the sample tested to confirm whether the lubricant has expired, thereby ensuring the timely replacement of the vehicle lubricant.

[0004] However, the related technology has complicated equipment requirements for lubricant oil sampling and testing, which increases the manufacturing cost of lubricant oil testing. In addition, different vehicles have different working environments and work intensities, which leads to unstable vehicle lubricant oil replacement time, making it difficult to ensure the timeliness and efficiency of lubricant oil replacement, affecting the effective maintenance of vehicle parts and components. The safety is insufficient and needs to be addressed urgently. Summary of the invention

[0005] The present application provides a vehicle lubricant evaluation method, device, vehicle and storage medium to solve the problems that the related technology requires complicated equipment for sampling and testing lubricants, which increases the manufacturing cost of lubricant testing, and that different vehicles have different working environments and work intensities, resulting in unstable replacement time of vehicle lubricants, making it difficult to ensure the timeliness and efficiency of lubricant replacement, affecting the effective maintenance of vehicle parts, and insufficient safety.

[0006] The first aspect of the present application provides a method for evaluating a vehicle lubricant, comprising the following steps: obtaining a current mileage accumulation value of the vehicle and at least one current environmental parameter of the gearbox; matching a target evaluation function set of the lubricant based on the current mileage accumulation value, and calculating estimated index parameters of the lubricant at each quality level using the target evaluation function set and the at least one current environmental parameter; based on the current index parameters of the lubricant, extracting estimated index parameters that meet preset error conditions from the estimated index parameters at each quality level to determine target index parameters, and generating an evaluation result of the lubricant based on the actual quality level corresponding to the target index parameters.

[0007] Optionally, in one embodiment of the present application, before matching the target evaluation function set of the lubricant based on the current mileage cumulative value, it also includes: matching the current mileage interval of the vehicle based on the current mileage cumulative value; based on the current mileage interval, extracting the parameter estimation function corresponding to each quality level from a pre-constructed evaluation function library to obtain the target evaluation function set.

[0008] Optionally, in one embodiment of the present application, before extracting the parameter estimation function corresponding to each quality level from a pre-built evaluation function library based on the current mileage interval, it also includes: dividing the mileage life of the vehicle based on preset mileage intervals to obtain all mileage intervals of the vehicle; in each mileage interval, generating a parameter relationship table corresponding to environmental parameters and index parameters at each quality level; generating a parameter estimation function at each quality level in each mileage interval based on the parameter relationship table to obtain the evaluation function library.

[0009] Optionally, in one embodiment of the present application, extracting the estimated index parameters that meet the preset error conditions from the estimated index parameters at each quality level includes: respectively calculating the error values ​​of the estimated index parameters at each quality level and the current index parameters to obtain the error values ​​at all quality levels; and confirming the estimated index parameters that meet the preset error conditions based on the error values ​​at all quality levels.

[0010] Optionally, in one embodiment of the present application, the evaluation result of the lubricant is generated based on the actual quality grade corresponding to the target indicator parameter, including: judging whether the actual quality grade is greater than or equal to a preset grade threshold; if the actual quality grade is greater than or equal to the preset grade threshold, determining that the evaluation result is lubricant failure, and generating a reminder message corresponding to the actual quality grade, otherwise, determining that the evaluation result is lubricant validity.

[0011] Optionally, in one embodiment of the present application, the evaluation result of the lubricant is generated based on the actual quality level corresponding to the target indicator parameter, including: when the evaluation result is lubricant failure, detecting whether the actual quality level meets preset warning conditions; when it is detected that the actual quality level meets the preset warning conditions, sending an alarm message of the lubricant to the driver.

[0012] A second aspect of the present application provides an evaluation device for a vehicle lubricant, comprising: an acquisition module for acquiring a current mileage accumulation value of the vehicle and at least one current environmental parameter of a gearbox; a calculation module for matching a target evaluation function set of the lubricant based on the current mileage accumulation value, and calculating estimated index parameters of the lubricant at each quality level using the target evaluation function set and the at least one current environmental parameter; an evaluation module for extracting estimated index parameters that meet preset error conditions from the estimated index parameters at each quality level based on the current index parameters of the lubricant to determine target index parameters, and generating an evaluation result of the lubricant based on the actual quality level corresponding to the target index parameters.

[0013] Optionally, in one embodiment of the present application, the device further includes: a matching module for matching the current mileage interval of the vehicle based on the current mileage cumulative value before matching the target evaluation function set of the lubricant based on the current mileage cumulative value; an extraction module for extracting the parameter estimation function corresponding to each quality level in a pre-built evaluation function library based on the current mileage interval to obtain the target evaluation function set.

[0014] Optionally, in one embodiment of the present application, the device further includes: a division module, which is used to divide the mileage life of the vehicle based on preset mileage intervals, before extracting the parameter estimation function corresponding to each quality level from a pre-built evaluation function library based on the current mileage interval, to obtain all mileage intervals of the vehicle; a first generation module, which is used to generate a parameter relationship table corresponding to environmental parameters and index parameters at each quality level in each mileage interval; and a second generation module, which is used to generate a parameter estimation function at each quality level in each mileage interval based on the parameter relationship table, to obtain the evaluation function library.

[0015] Optionally, in one embodiment of the present application, the evaluation module includes: a calculation unit, used to respectively calculate the error value of the estimated index parameter and the current index parameter under each quality level to obtain the error value under all quality levels; a confirmation unit, used to confirm the estimated index parameter that meets the preset error condition based on the error value under all quality levels.

[0016] Optionally, in one embodiment of the present application, the evaluation module includes: a judgment unit, used to judge whether the actual quality level is greater than or equal to a preset level threshold; a generation unit, used to judge that the evaluation result is a lubricant failure when the actual quality level is greater than or equal to the preset level threshold, and generate a reminder message corresponding to the actual quality level; otherwise, judge that the evaluation result is that the lubricant is valid.

[0017] Optionally, in one embodiment of the present application, the evaluation module includes: a detection unit, used to detect whether the actual quality level meets the preset warning conditions when the evaluation result is lubricant failure; and a warning unit, used to send the lubricant alarm information to the driver when it is detected that the actual quality level meets the preset warning conditions.

[0018] A third aspect of the present application provides a vehicle, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the vehicle lubricant evaluation method as described in the above embodiment.

[0019] A fourth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, which, when executed by a processor, implements the above-mentioned vehicle lubricant evaluation method.

[0020] A fifth aspect of the present application provides a computer program, which, when executed, implements the above-mentioned vehicle lubricant evaluation method.

[0021] The embodiment of the present application can judge the degree of deterioration of the lubricant according to the current state of the engine and the physical and chemical indicators of the lubricant, and realizes efficient and accurate monitoring of the state of the lubricant, thereby ensuring the stable and safe operation of the engine, which is more convenient and practical. Thus, it solves the problem that the equipment requirements for sampling and testing lubricants in related technologies are relatively cumbersome, which increases the manufacturing cost of lubricant testing, and the differences in working environment and work intensity of different vehicles lead to unstable replacement time of vehicle lubricants, making it difficult to ensure the timeliness and efficiency of lubricant replacement, affecting the effective maintenance of vehicle parts, and insufficient safety.

[0022] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0024] Figure 1 A flow chart of a method for evaluating vehicle lubricating oil provided according to an embodiment of the present application;

[0025] Figure 2 A schematic diagram of a lubricating oil quality detection method according to an embodiment of the present application;

[0026] Figure 3 This is a schematic diagram of a process for determining the quality of lubricating oil according to an embodiment of the present application;

[0027] Figure 4 This is an interactive logic diagram of lubricating oil quality detection according to one embodiment of the present application;

[0028] Figure 5 It is a structural schematic diagram of a vehicle lubricant evaluation device according to an embodiment of the present application;

[0029] Figure 6 It is a schematic diagram of the structure of a vehicle according to an embodiment of the present application. DETAILED DESCRIPTION

[0030] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0031] The following describes the evaluation method, device, vehicle and storage medium of the vehicle lubricant of the embodiment of the present application with reference to the accompanying drawings. In view of the fact that the equipment requirements for sampling and testing lubricants in the related art mentioned in the above background technology are relatively cumbersome, which increases the manufacturing cost of lubricant testing, and there are differences in working environment and work intensity between different vehicles, resulting in unstable replacement time of vehicle lubricants, making it difficult to ensure the timeliness and efficiency of lubricant replacement, affecting the effective maintenance of vehicle parts, and insufficient safety, the present application provides a vehicle lubricant evaluation method, in which a function set for analyzing the state of lubricants can be determined based on the actual mileage of the vehicle engine, so as to judge the degree of deterioration of the lubricants according to the current state of the engine and the physical and chemical indicators of the lubricants, and realize efficient and accurate monitoring of the state of lubricants, thereby ensuring the stable and safe operation of the engine, which is more convenient and practical. Thus, the related art solves the problem that the equipment requirements for sampling and testing lubricants in the related art are relatively cumbersome, which increases the manufacturing cost of lubricant testing, and there are differences in working environment and work intensity between different vehicles, resulting in unstable replacement time of vehicle lubricants, making it difficult to ensure the timeliness and efficiency of lubricant replacement, affecting the effective maintenance of vehicle parts, and insufficient safety.

[0032] Specifically, Figure 1 A schematic flow chart of a method for evaluating vehicle lubricating oil provided in an embodiment of the present application.

[0033] like Figure 1 As shown, the evaluation method of the vehicle lubricant comprises the following steps:

[0034] In step S101 , the current accumulated mileage value of the vehicle and at least one current environmental parameter of the transmission are obtained.

[0035] It can be understood that in the embodiments of the present application, the current accumulated mileage value of the vehicle may be the total accumulated mileage of the vehicle, and the odometer data of the vehicle may be read by the engine control unit. At least one current environmental parameter of the gearbox may be parameters such as the current temperature and current pressure of the gearbox, which may be obtained by temperature sensors, oil pressure sensors, etc. on the gearbox.

[0036] In step S102 , a target evaluation function set of the lubricant is matched based on the current mileage accumulation value, and an estimated index parameter of the lubricant at each quality level is calculated using the target evaluation function set and at least one current environmental parameter.

[0037] It can be understood that in the embodiments of the present application, the quality grade of the lubricant can be uniformly defined based on pre-calibration, and the target evaluation function set includes all evaluation functions of the current environmental parameters and estimated index parameters under each lubricant quality grade. The estimated index parameters can be parameters reflecting the physical and chemical indicators of the lubricant, such as the dielectric constant and viscosity of the lubricant.

[0038] Specifically, for the selection of physical and chemical indicators of lubricating oil, the indicators for evaluating the quality of lubricating oil can be determined according to the oil change standard and the changes of the main indicators when the lubricating oil deteriorates, and a lubricating oil quality evaluation table can be established based on the indicators. The changes in the physical and chemical indicators for evaluating the quality of lubricating oil are mainly: acid value, water content, colloid content, wear particle content, viscosity value, and dielectric constant. The changes in the physical and chemical indicators when the quality of lubricating oil deteriorates are mainly: the acid value increases, the water content, colloid content, and wear particle content increase, and the viscosity value and dielectric constant increase.

[0039] When some of the above physical and chemical indicators change, other indicators will also be affected and change. With the use of lubricating oil, foreign water will penetrate, acidic substances and wear particles will be produced, resulting in an increase in the content of polar molecules in the lubricating oil, that is, changes in water content, acidity value, and number of abrasive particles will lead to changes in the dielectric constant, and the dielectric constants of water, acidic substances, and wear particles are often much larger than the dielectric constant of the lubricating oil. The change in the dielectric constant is manifested in that with the increase of water content, acidity value, and number of abrasive particles, the dielectric constant of the lubricating oil increases significantly. The dielectric constant can also reflect the insulating properties of the lubricating oil. In summary, the dielectric constant can be used as a comprehensive indicator to evaluate the degree of deterioration of the quality of the lubricating oil.

[0040] Through multiple experiments, we collected and analyzed experimental data, and based on the relevant lubricant replacement evaluation indicators, we found the dielectric constant value when the lubricant reaches the replacement index, and used its average or minimum value as the generally applicable lubricant replacement judgment standard. The dielectric constant of the lubricant is set to ε, with the unit of farad per meter (F / m). The dielectric constant value of a new, unused lubricant is ε0, and the dielectric constant value when the oil replacement standard is reached is ε *, that is, the allowable range of the dielectric constant ε of the lubricating oil is [ε0,ε * ], when the dielectric constant ε of the lubricating oil exceeds this range, the lubricating oil needs to be replaced.

[0041] Lubricating oil will produce an oil film between the friction pairs of the transmission system to complete its lubrication function, so viscosity is a decisive indicator for evaluating its strength and fluidity. During use, lubricating oil will undergo oxidation cracking and polymerization due to high temperature, producing colloids, which will increase viscosity and reduce the lubricating performance of the lubricating oil. In summary, lubricating oil viscosity is selected as the main physical and chemical indicator to measure the deterioration of lubricating oil quality. The viscosity of the lubricating oil to be replaced changes due to different applicable standards. Usually, at a fixed temperature t℃, if the change rate of the kinematic viscosity of the lubricating oil compared to the kinematic viscosity of a new, unused lubricating oil exceeds a certain range, then it is replaced.

[0042] The kinematic viscosity of the lubricating oil is expressed as V, in square millimeters per second (mm 2 / s), the kinematic viscosity of the lubricating oil at t℃ is V t It means that the kinematic viscosity of new unused lubricating oil at t℃ is V t0 The kinematic viscosity change rate is expressed as η (%), and the calculation formula is: According to the oil change index, the allowable range of the lubricating oil viscosity change rate at t℃ is set as [η min %,η max %], where η min is a negative number, η max is a positive number, that is, when the temperature of the lubricating oil is t℃, the allowable range of kinematic viscosity is The kinematic viscosity V of the lubricating oil at t℃ t If it exceeds this range, the lubricating oil needs to be replaced.

[0043] Furthermore, the lubricant quality evaluation table is formulated as follows: the lubricant quality is evaluated according to the dielectric constant and the viscosity change rate, and the dielectric constant value ε takes the range [ε1,ε n ], starting from the minimum value ε1, n dielectric constant values ​​are uniformly taken at regular intervals, and the kinematic viscosity V at t℃ t Value range [V t1 ,V tm ] from the minimum value V t1 Starting from this, m kinematic viscosity values ​​are uniformly taken at regular intervals, and the i-th dielectric constant value ε i And the kinematic viscosity value V at the jth t℃ tj The corresponding lubricant quality is q ij Indicates, where i = 1, 2, ..., n, j = 1, 2, ..., m. ε1, ε n The upper and lower limits of the dielectric constant of the custom lubricant oil satisfy the conditions ε1<ε0, ε n >ε* ; V t1 , V tm The upper and lower limits of the kinematic viscosity range at t℃ are defined by the user, and they meet the following conditions:

[0044] To further illustrate the lubricant quality ij The evaluation method is as follows: define n = 7, m = 7. Take 7 points in [ε1,ε7], namely: ε1, ε2, ε3, ε4, ε5, ε6, ε7, and set ε2 = ε0, ε4 = ε * ; [V t1 ,V t7 ], and they are V t1 、V t2 、V t3 、V t4 、V t5 、V t6 、V t7 ; Set it

[0045] Table 1 shows the dielectric constant ε, viscosity V and quality q of lubricating oil ij Corresponding relationship table, lubricant quality q ij The relationship with dielectric constant ε and viscosity V is as follows:

[0046] Table 1

[0047]

[0048] It can be seen from the table that the lubricant quality q ij There are n×m types; in this example, the lubricant quality is q 23 ,q 24 ,q 25 ,q 33 ,q 34 ,q 35 ,q 43 ,q 44 ,q 45 There is no need to change the oil at this time. Considering that the lubricating oil may not be replaced in time, calibration is also required when the quality does not meet the standards.

[0049] Optionally, in one embodiment of the present application, before matching the target evaluation function set of the lubricant based on the current mileage cumulative value, it also includes: matching the current mileage range of the vehicle based on the current mileage cumulative value; based on the current mileage range, extracting the parameter estimation function corresponding to each quality level in the pre-built evaluation function library to obtain the target evaluation function set.

[0050] In the actual implementation process, based on the vehicle mileage data obtained in the above steps, the corresponding relationship table and calculation function formula can be selected according to the mileage. Get the current mileage of the vehicle and select different qualities q corresponding to the current mileage ij The multivariate nonlinear function model of lubricating oil with temperature T and pressure P as independent variables and dielectric constant ε as dependent variable, as well as the multivariate nonlinear function model with temperature T and pressure P as independent variables and flow rate Q as dependent variable, obtain the target evaluation function set.

[0051] For example, if the vehicle mileage is 46,800 kilometers, then different qualities q corresponding to mileages of 40,000 to 80,000 kilometers are selected. ij The multivariate nonlinear function model of lubricating oil with temperature T and pressure P as independent variables, dielectric constant ε as dependent variable, and different quality q corresponding to mileage of 40,000-80,000 kilometers ij A multivariate nonlinear function model of lubricating oil with temperature T and pressure P as independent variables and flow rate Q as the dependent variable.

[0052] Furthermore, according to the current environmental parameters of the gearbox, namely the actual temperature and pressure data of the lubricating oil, the dielectric constant and flow rate of lubricating oils of different qualities at the current temperature and pressure are calculated. The actual temperature T and pressure P data of the lubricating oil are collected and input as independent variables, respectively, and the multivariate nonlinear function model with temperature T and pressure P as independent variables and dielectric constant ε as dependent variable is calculated, and the multivariate nonlinear function model with temperature T and pressure P as independent variables and flow rate Q as dependent variable is calculated to obtain the dielectric constants and flow rates of lubricating oils of different qualities q ij The estimated dielectric constant (expressed as ε) of the lubricating oil at the current temperature T and pressure P ij denoted by Q ij Get the estimated dielectric constant (expressed by ε) corresponding to the current temperature T and pressure P for each quality ij denoted by Q ij Represents a set of) to obtain the estimated indicator parameters.

[0053] Optionally, in one embodiment of the present application, before extracting the parameter estimation function corresponding to each quality level from a pre-built evaluation function library based on the current mileage interval, it also includes: dividing the mileage life of the vehicle based on preset mileage intervals to obtain all mileage intervals of the vehicle; in each mileage interval, generating a parameter relationship table corresponding to environmental parameters and index parameters at each quality level; generating a parameter estimation function at each quality level in each mileage interval based on the parameter relationship table to obtain an evaluation function library.

[0054] In the actual implementation process, all mileage intervals of the vehicle are divided, and the vehicle is recalibrated every time it travels a certain mileage to obtain the above relationship table and function model corresponding to different mileages. As the vehicle mileage increases, the gearbox hardware structure and performance may change, and the sensor may age and cause distortion of the measurement data. To avoid this problem, it is required that the vehicle be recalibrated every time it travels a certain mileage to obtain the corresponding lubricating oil temperature T, pressure P, dielectric constant ε, flow rate Q and lubricating oil quality q at different mileages. ij The corresponding relationship table of different qualities q ij A multivariate nonlinear function model of lubricating oil with temperature T and pressure P as independent variables and dielectric constant ε as dependent variable, as well as a multivariate nonlinear function model with temperature T and pressure P as independent variables and flow rate Q as dependent variable.

[0055] For example, if the gearbox is designed to have a service life of 400,000 kilometers, it is set to be calibrated every 40,000 kilometers. Each calibration will obtain a set of relationship tables and multivariate nonlinear function equations. A total of ten calibrations will be performed to obtain ten sets of relationship tables and multivariate nonlinear function equations. When the gearbox mileage is within 40,000 kilometers, the relationship table and multivariate nonlinear function equation corresponding to the mileage of 0-40,000 kilometers are used; when the gearbox mileage is between 40,000 and 80,000 kilometers, the relationship table and multivariate nonlinear function equation corresponding to the mileage of 40,000-80,000 kilometers are used, and so on.

[0056] Specifically, the calibration of the parameter relationship table corresponding to the environmental parameters and index parameters under each quality level includes: selecting the appropriate measurement temperature and pressure value range according to the type and properties of the selected lubricant, the vehicle working environment and hardware design parameters. According to the type and properties of the selected lubricant, the working scene and hardware parameters of the vehicle are designed, and the value range of the lubricant temperature T and pressure P measured during the calibration process is selected.

[0057] For example, the lubricating oil temperature T is selected to be in the range of -40 degrees Celsius to 100 degrees Celsius, and the pressure P is selected to be in the range of 10 kPa to 2000 kPa. The range of the measured temperature and pressure is not fixed and can be modified according to the actual situation.

[0058] Perform gearbox calibration work and collect dielectric constant and flow data of different quality lubricants under different temperature and pressure conditions. Each quality of lubricant needs to be measured. Select the measurement temperature value T at a certain interval within the measurement temperature range. k , select s temperature values ​​in total, where k = 1, 2, ... s. Select the measured pressure P at regular intervals within the range of measured pressure values l , select t pressure values ​​in total, where l = 1, 2, ..., t. Lubricating oil dielectric constant ε kl For a certain lubricating oil temperature Tk and a certain pressure P l The corresponding dielectric constant ε kl , lubricating oil flow Q kl For a certain lubricating oil temperature T k and a certain pressure P l The corresponding flow Q kl .

[0059] During the gearbox calibration process, the lubricating oil temperature T, pressure P, dielectric constant ε and flow Q are collected using different sensors. The lubricating oil temperature T is measured by a temperature sensor installed in the gearbox oil pool or at the oil pipeline. The pressure P is obtained by measuring the system oil circuit pressure with a pressure sensor. The dielectric constant ε is obtained by measuring the lubricating oil in the oil circuit with a dielectric sensor. The flow Q is obtained by measuring the lubricating oil flow in the oil circuit with a flow sensor.

[0060] Each time the temperature T is collected k 、Pressure P l , dielectric constant ε l and flow rate Q l Record once and collect the same temperature T multiple times k 、Pressure P l Dielectric constant ε under the condition kl and flow rate Q kl , take the average value of multiple measurement results as the actual recorded dielectric constant ε kl and flow rate Q kl , until at all temperatures T k 、Pressure P l Dielectric constant ε kl and flow rate Q kl Data collection is completed. After the collection is completed, change to other quality lubricants and repeat the above collection work until each quality lubricant completes different temperatures T k , pressure P l Dielectric constant ε under the condition kl and flow rate Q kl The application has no fixed requirements for the range of values ​​of the measured temperature and pressure, which can be changed according to actual needs; there is no restriction on the model, quantity and installation position of the sensor, but the collected data must correspond to the model, quantity and installation position of the sensor. If the sensor model is changed, the quantity is increased or decreased, or the installation position is changed, the data must be collected again to prevent errors in the measurement results caused by changing the sensor model, increasing or decreasing the quantity or changing the installation position; the flow rate Q of the lubricating oil is affected by the temperature T, pressure P and viscosity V, so the viscosity V of lubricating oils of different qualities is different at the same temperature T and pressure P, and the measured flow rate Q is also different, and the additional viscosity sensor to measure the viscosity V will increase the cost burden.

[0061] Furthermore, a corresponding relationship table between temperature, pressure, dielectric constant and flow rate of lubricating oil of different qualities is established. ij Table of the relationship between the temperature T, pressure P, dielectric constant ε and flow rate Q of the lubricating oil. For example: define s = 5, t = 5. Select 5 measured temperature values ​​at regular intervals between -40 degrees Celsius and 100 degrees Celsius, namely T1, T2, T3, T4, and T5; select 5 measured pressure values ​​at regular intervals between 10 kPa and 2000 kPa, namely P1, P2, P3, P4, and P5. Among them, Table 2 is q ij Relationship table of quality lubricating oil temperature T, pressure P, dielectric constant ε and flow rate Q:

[0062] Table 2

[0063]

[0064] Through the multivariate nonlinear regression method, a multivariate nonlinear function model of temperature, pressure and dielectric constant of lubricating oils of different qualities is established. Through the multivariate nonlinear regression method, temperature T and pressure P are used as independent variables, and dielectric constant ε is used as dependent variable to establish a multivariate nonlinear function model. Through the multivariate nonlinear regression method, a multivariate nonlinear function model of temperature, pressure and flow of lubricating oils of different qualities is established. According to the data obtained in step S104, through the multivariate nonlinear regression method, temperature T and pressure P are used as independent variables, and flow Q is used as dependent variable to establish a multivariate nonlinear function model. Among them, this application does not limit the type of multivariate nonlinear function model, which can be defined according to actual needs.

[0065] In step S103, based on the current index parameters of the lubricant, estimated index parameters that meet preset error conditions are extracted from the estimated index parameters at each quality level to determine the target index parameters, and the evaluation results of the lubricant are generated based on the actual quality level corresponding to the target index parameters.

[0066] It should be noted that the preset error condition can be set by those skilled in the art according to actual conditions and is not specifically limited here.

[0067] It can be understood that in the embodiment of the present application, the quality q of the lubricant currently in use is determined according to the target indicator parameter. ij , get the evaluation results of the lubricating oil to determine whether to issue the corresponding oil change reminder and early warning signal. The current index parameters can be collected in real time through sensors.

[0068] Optionally, in one embodiment of the present application, estimated index parameters that meet preset error conditions are extracted from the estimated index parameters at each quality level, including: respectively calculating the error values ​​of the estimated index parameters and the current index parameters at each quality level to obtain the error values ​​at all quality levels; and confirming the estimated index parameters that meet the preset error conditions based on the error values ​​at all quality levels.

[0069] In the actual implementation process, the actual dielectric constant and flow rate of the collected lubricating oil can be compared with the dielectric constant and flow rate of lubricating oil of different qualities to calculate the error. ij Dielectric constant of lubricating oil ε ij and flow rate Q ij Compare and calculate the error. Compare the estimated dielectric constant and flow rate calculated under each quality, select the estimated quantity with the smallest error between the estimated quantity and the actual measured value, and obtain the actual quality of the lubricant based on the quality corresponding to the estimated quantity.

[0070] Define the actual lubricating oil dielectric constant ε and calculate q ij Dielectric constant of quality lubricating oil ε ij The error is z ε.ij , the actual lubricating oil flow Q and the calculated q ij Quality lubricating oil flow Q ij The error is z Q.ij , where i = 1, 2, ..., n, j = 1, 2, ..., m. ε.ij and z Q.ij It can be calculated by the following formula:

[0071] z ε.ij =ε-ε ij ,

[0072] z Q.ij =QQ ij ,

[0073] The estimated index parameter with the smallest sum of the absolute values ​​of the errors is used as the estimated index parameter that meets the preset error conditions, and the target index parameter is obtained. The quality of the lubricating oil corresponding to the target index parameter is used as the actual quality of the current lubricating oil, and the lubricating oil quality record is recorded. Define the total error z ij is the error z ε.ij and error z Q.ij The sum of the absolute values ​​of , that is:

[0074] z ij =|z ε.ij |+|z Q.ij |=|ε-ε ij |+|QQ ij |,

[0075] Where i = 1, 2, ..., n, j = 1, 2, ..., m. Compare z ij The size of the minimum z ij The corresponding lubricant quality q ij That is the quality of the lubricant currently in use.

[0076] Optionally, in one embodiment of the present application, an evaluation result of the lubricant is generated based on the actual quality grade corresponding to the target indicator parameter, including: determining whether the actual quality grade is greater than or equal to a preset grade threshold; if the actual quality grade is greater than or equal to the preset grade threshold, the evaluation result is determined to be lubricant failure, and a reminder message corresponding to the actual quality grade is generated; otherwise, the evaluation result is determined to be lubricant validity.

[0077] It should be noted that the preset level threshold can be set by those skilled in the art according to actual conditions and is not specifically limited here.

[0078] In the actual implementation process, the preset grade threshold can be pre-set according to the performance standard of the lubricant and the vehicle maintenance requirements as a standard for judging whether the lubricant has expired. The current actual quality grade of the lubricant is determined using the estimated index parameters, and the actual quality grade is compared with the preset quality grade threshold to generate an evaluation result. If the actual quality grade is greater than or equal to the preset threshold, the lubricant is determined to be expired, and a corresponding reminder message is generated. For example, for expired lubricants, a reminder message can be generated for the user and displayed on the vehicle's central control screen instrument or the user's mobile electronic device, such as "The quality of the lubricant has deteriorated, please replace it as soon as possible" or "The lubricant has expired, replace it immediately to avoid damage."

[0079] Optionally, in one embodiment of the present application, an evaluation result of the lubricant is generated based on the actual quality level corresponding to the target indicator parameter, including: when the evaluation result is that the lubricant has failed, detecting whether the actual quality level meets preset warning conditions; and sending lubricant alarm information to the driver when it is detected that the actual quality level meets the preset warning conditions.

[0080] It should be noted that the preset warning conditions can be set by those skilled in the art according to actual conditions and are not specifically limited here.

[0081] In actual implementation, the preset warning condition may be when the quality level of the lubricant is lower than a certain value, for example, when the quality level of the lubricant reaches a level that makes the vehicle unsafe to drive. If the actual quality level meets the warning condition, an alarm message is generated, such as by lighting up the vehicle warning light or playing a warning voice through the vehicle audio system, so that when the lubricant quality drops to the warning level, the driver is notified in time to ensure that necessary maintenance measures are taken before the lubricant completely fails to prevent vehicle damage and driving risks.

[0082] like Figure 2-4 As shown, the working content of the embodiment of the present application is described in detail below with a specific embodiment. Figure 2 A schematic diagram of a lubricating oil quality detection method according to an embodiment of the present application.

[0083] Step S201, determining the index for evaluating the quality of the lubricating oil according to the oil change standard and the changes of the main indexes when the lubricating oil deteriorates, and establishing a lubricating oil quality evaluation table according to the indexes.

[0084] Step S202, selecting a suitable measurement temperature and pressure value range according to the type and properties of the selected lubricant, the vehicle working environment and hardware design parameters.

[0085] Step S203, during the gearbox calibration work, dielectric constant and flow rate data measured when using lubricating oils of different qualities under different temperature and pressure conditions are collected.

[0086] Step S204, establishing a corresponding relationship table between the temperature, pressure, dielectric constant and flow rate of lubricating oils of different qualities.

[0087] Step S205 , establishing a multivariate nonlinear function model of temperature, pressure and dielectric constant of lubricating oils of different qualities by using a multivariate nonlinear regression method.

[0088] Step S206, establishing a multivariate nonlinear function model of temperature, pressure and flow rate of lubricating oils of different qualities by using a multivariate nonlinear regression method.

[0089] Step S207, the vehicle is recalibrated every time it travels a certain mileage to obtain the above relationship table and function model corresponding to different mileages.

[0090] Step S208, during the actual driving process of the vehicle, mileage data, lubricant oil temperature, flow, pressure, and dielectric constant information are collected, the lubricant oil quality is obtained by table lookup and calculation, and it is determined whether to issue an oil change reminder and warning signal.

[0091] Among them, for step S208, if Figure 3 FIG. 2 is a schematic diagram of a process for determining the quality of lubricating oil according to an embodiment of the present application. The specific implementation process of step S208 is as follows:

[0092] Step S301: Start.

[0093] Among them, the process of judging the quality of the lubricant oil begins.

[0094] Step S302: Acquire vehicle mileage data, and select a corresponding relationship table and a calculation function formula according to the mileage.

[0095] Among them, obtain the current mileage of the vehicle and select different quality q ij A multivariate nonlinear function model of lubricating oil with temperature T and pressure P as independent variables and dielectric constant ε as dependent variable, as well as a multivariate nonlinear function model with temperature T and pressure P as independent variables and flow rate Q as dependent variable.

[0096] Step S303: Collect the actual temperature and pressure data of the lubricating oil for calculation, and obtain the dielectric constant and flow rate of lubricating oils of different qualities at the current temperature and pressure.

[0097] The actual temperature T and pressure P data of the lubricating oil are collected and input as independent variables respectively. The multivariate nonlinear function model with temperature T and pressure P as independent variables and dielectric constant ε as dependent variable is calculated, and the multivariate nonlinear function model with temperature T and pressure P as independent variables and flow rate Q as dependent variable is calculated to obtain different quality q ij The estimated dielectric constant (expressed as ε) of the lubricating oil at the current temperature T and pressure P ij denoted by Q ij express).

[0098] Step S304: Compare the actual dielectric constant and flow rate of the collected lubricating oil with the dielectric constant and flow rate of lubricating oils of different qualities obtained by calculation, and calculate the error.

[0099] The actual dielectric constant ε and flow rate Q of the lubricating oil collected are compared with the different qualities q calculated in step S203. ij Dielectric constant of lubricating oil ε ij and flow rate Q ij Compare and calculate the error.

[0100] Step S305: The quality of the lubricating oil with the smallest sum of absolute values ​​of errors is taken as the current lubricating oil quality, and the lubricating oil quality record is recorded.

[0101] Among them, the total error z ij The size of the minimum z ij The corresponding lubricant quality q ij That is the quality of the lubricant currently in use.

[0102] Step S306: Determine whether the lubricating oil quality exceeds a threshold.

[0103] If the lubricating oil quality exceeds the threshold, the process proceeds to step S307 , otherwise, the process proceeds to step S308 .

[0104] Step S307: Send an alarm to remind you to change the lubricating oil.

[0105] Among them, when the quality of the lubricant does not meet the standards, an alarm will be issued to remind the driver to replace the lubricant in time.

[0106] Step S308: Determine whether the vehicle stops running.

[0107] If the vehicle stops running, the lubricating oil quality judgment is no longer performed and step S309 is executed. If the vehicle is still running, step S302 is executed.

[0108] Step S309: End.

[0109] Herein, the process of judging the quality of the lubricating oil is completed.

[0110] Figure 4 This is an interactive logic diagram of lubricating oil quality detection according to an embodiment of the present application, which can be used to implement the process shown in 2-3.

[0111] Among them, the temperature sensor can be installed in the bottom of the gearbox oil pool or in the oil circuit. Its function is to measure the temperature data of the lubricating oil in the gearbox in real time and send the data to the controller.

[0112] The pressure sensor can be installed in the oil circuit. Its function is to measure the lubricating oil pressure data in the gearbox in real time and send the data to the controller.

[0113] The dielectric constant sensor can be installed in the oil pool or in the oil circuit. Its function is to measure the dielectric constant data of the lubricating oil in the gearbox in real time and send the data to the controller.

[0114] The flow sensor can be installed at the oil pump in the oil circuit. Its function is to measure the flow data of the lubricating oil in the gearbox in real time and send the data to the controller.

[0115] The controller can be a single-chip microcomputer designed separately or a transmission control unit (TCU) integrated in the transmission. Its function is to summarize the temperature data input by the temperature sensor, the pressure data input by the pressure sensor, the dielectric constant data input by the dielectric constant sensor, and the flow data input by the flow sensor. At the same time, it obtains the current mileage data from the CAN (Controller Area Network) bus, comprehensively analyzes the above data, determines the quality of the current lubricant, sends the lubricant quality to the storage, and sends the alarm information to the CAN bus. According to the vehicle mileage obtained from the CAN bus, select the multivariate nonlinear function of the temperature and pressure of lubricants of different qualities corresponding to the mileage and the dielectric constant and flow rate, calculate the dielectric constant and flow rate of lubricants of different qualities at this temperature and pressure according to the actual temperature and pressure collected in real time, and compare the actual dielectric constant and pressure with the calculated dielectric constant and pressure of lubricants of different qualities. The quality of the lubricant with the smallest error is used as the quality of the lubricant currently in use. The quality of the lubricant is sent to the storage for storage. If the quality is unqualified, an alarm is sent to the CAN bus.

[0116] The storage device is used to store vehicle mileage data and lubricant quality data.

[0117] The function of CAN bus is to transmit data signals and realize data communication between various nodes of the vehicle.

[0118] According to the vehicle lubricant evaluation method proposed in the embodiment of the present application, the degree of lubricant deterioration can be judged according to the current state of the engine and the physical and chemical indicators of the lubricant, and efficient and accurate monitoring of the state of the lubricant is achieved, thereby ensuring the stable and safe operation of the engine, which is more convenient and practical. As a result, the related technology solves the problem that the equipment requirements for sampling and testing lubricants are relatively cumbersome, which increases the manufacturing cost of lubricant testing, and the differences in working environment and work intensity of different vehicles lead to unstable replacement time of vehicle lubricants, making it difficult to ensure the timeliness and efficiency of lubricant replacement, affecting the effective maintenance of vehicle parts, and insufficient safety.

[0119] Next, the evaluation device for vehicle lubricating oil proposed in accordance with an embodiment of the present application will be described with reference to the accompanying drawings.

[0120] Figure 5 It is a schematic diagram of the structure of the evaluation device for vehicle lubricating oil according to an embodiment of the present application.

[0121] like Figure 5 As shown, the vehicle lubricant evaluation device 10 includes: an acquisition module 100 , a calculation module 200 and an evaluation module 300 .

[0122] The acquisition module 100 is used to acquire the current accumulated mileage value of the vehicle and at least one current environmental parameter of the gearbox.

[0123] The calculation module 200 is used to match the target evaluation function set of the lubricant based on the current mileage accumulation value, and calculate the estimated index parameter of the lubricant at each quality level by using the target evaluation function set and at least one current environmental parameter.

[0124] The evaluation module 300 is used to extract the estimated index parameters that meet the preset error conditions from the estimated index parameters at each quality level based on the current index parameters of the lubricant to determine the target index parameters, and generate the evaluation results of the lubricant based on the actual quality level corresponding to the target index parameters.

[0125] Optionally, in one embodiment of the present application, the device 10 further includes: an extraction module and a matching module.

[0126] The matching module is used to match the current mileage interval of the vehicle based on the current mileage cumulative value before matching the target evaluation function set of the lubricant based on the current mileage cumulative value.

[0127] The extraction module is used to extract the parameter estimation function corresponding to each quality level from the pre-built evaluation function library based on the current mileage interval to obtain a target evaluation function set.

[0128] Optionally, in one embodiment of the present application, the device 10 further includes: a division module, a first generation module and a second generation module.

[0129] Among them, the division module is used to divide the mileage life of the vehicle based on the preset mileage interval before extracting the parameter estimation function corresponding to each quality level in the pre-built evaluation function library based on the current mileage interval to obtain all mileage intervals of the vehicle.

[0130] The first generating module is used to generate a parameter relationship table corresponding to the environmental parameters and the index parameters under each quality level in each mileage interval.

[0131] The second generation module is used to generate a parameter estimation function for each quality level in each mileage interval based on the parameter relationship table to obtain an evaluation function library.

[0132] Optionally, in one embodiment of the present application, the evaluation module 300 includes: a calculation unit and a confirmation unit.

[0133] The calculation unit is used to calculate the error values ​​of the estimated index parameters and the current index parameters at each quality level respectively, and obtain the error values ​​at all quality levels.

[0134] The confirmation unit is used to confirm the estimation index parameters that meet the preset error conditions based on the error values ​​under all quality levels.

[0135] Optionally, in one embodiment of the present application, the evaluation module 300 includes: a judgment unit and a generation unit.

[0136] The judging unit is used to judge whether the actual quality level is greater than or equal to a preset level threshold.

[0137] The generating unit is used to determine the evaluation result as lubricant failure when the actual quality level is greater than or equal to the preset level threshold, and generate reminder information corresponding to the actual quality level; otherwise, the evaluation result is determined as lubricant validity.

[0138] Optionally, in one embodiment of the present application, the evaluation module 300 includes: a detection unit and an early warning unit.

[0139] Among them, the detection unit is used to detect whether the actual quality level meets the preset warning conditions when the evaluation result is that the lubricant has failed.

[0140] The early warning unit is used to send lubricant oil alarm information to the driver when it is detected that the actual quality level meets the preset early warning conditions.

[0141] It should be noted that the above explanations and descriptions of the embodiment of the vehicle lubricant oil evaluation method are also applicable to the vehicle lubricant oil evaluation device of this embodiment, and will not be repeated here.

[0142] According to the vehicle lubricant evaluation device proposed in the embodiment of the present application, the degree of lubricant deterioration can be judged according to the current state of the engine and the physical and chemical indicators of the lubricant, and efficient and accurate monitoring of the state of the lubricant is achieved, thereby ensuring the stable and safe operation of the engine, which is more convenient and practical. Thus, the related technology solves the problem that the equipment requirements for sampling and testing lubricants are relatively cumbersome, which increases the manufacturing cost of lubricant testing, and the differences in working environment and work intensity of different vehicles lead to unstable replacement time of vehicle lubricants, making it difficult to ensure the timeliness and efficiency of lubricant replacement, affecting the effective maintenance of vehicle parts, and insufficient safety.

[0143] Figure 6 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application. The vehicle may include:

[0144] A memory 601 , a processor 602 , and a computer program stored in the memory 601 and executable on the processor 602 .

[0145] When the processor 602 executes the program, the vehicle lubricant oil evaluation method provided in the above embodiment is implemented.

[0146] Furthermore, the vehicle also includes:

[0147] The communication interface 603 is used for communication between the memory 601 and the processor 602 .

[0148] The memory 601 is used to store computer programs that can be executed on the processor 602 .

[0149] The memory 601 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0150] If the memory 601, the processor 602 and the communication interface 603 are implemented independently, the communication interface 603, the memory 601 and the processor 602 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 6 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0151] Optionally, in a specific implementation, if the memory 601, the processor 602 and the communication interface 603 are integrated on a chip, the memory 601, the processor 602 and the communication interface 603 can communicate with each other through an internal interface.

[0152] The processor 602 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0153] This embodiment also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the above-mentioned vehicle lubricant evaluation method is implemented.

[0154] This embodiment also provides a computer program, which implements the above vehicle lubricant evaluation method when executed.

[0155] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0156] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0157] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0158] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways as necessary and then storing it in a computer memory.

[0159] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0160] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0161] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0162] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for evaluating vehicle lubricating oil, characterized in that: The following steps are involved: Acquiring a current mileage accumulation value of the vehicle and at least one current environmental parameter of a transmission; Matching a target evaluation function set of the lubricant based on the current mileage accumulation value, and calculating an estimated index parameter of the lubricant at each quality level using the target evaluation function set and the at least one current environmental parameter; Based on the current index parameters of the lubricating oil, estimated index parameters satisfying preset error conditions are extracted from the estimated index parameters under each quality level to determine target index parameters, and an evaluation result of the lubricating oil is generated based on the actual quality level corresponding to the target index parameters.

2. The method according to claim 1, characterized in that: Before matching the target evaluation function set of lubricating oil based on the current mileage accumulation value, the method further includes: matching a current mileage interval of the vehicle based on the current mileage cumulative value; Based on the current mileage interval, a parameter estimation function corresponding to each quality level is extracted from a pre-constructed evaluation function library to obtain the target evaluation function set.

3. The method according to claim 2, characterized in that Before extracting the parameter estimation function corresponding to each quality level from the pre-built evaluation function library based on the current mileage interval, the method further includes: Dividing the mileage life of the vehicle based on preset mileage intervals to obtain all mileage intervals of the vehicle; In each mileage interval, a parameter relationship table corresponding to the environmental parameters and indicator parameters under each quality level is generated; A parameter estimation function for each quality level in each mileage interval is generated based on the parameter relationship table to obtain the evaluation function library.

4. The method according to claim 1, characterized in that: The extracting of the estimation index parameters satisfying the preset error condition from the estimation index parameters at each quality level includes: Calculating the error values ​​of the estimated index parameter and the current index parameter at each quality level respectively, and obtaining the error values ​​at all quality levels; An estimation index parameter satisfying the preset error condition is determined based on the error values ​​at all quality levels.

5. The method according to claim 1, characterized in that The step of generating the evaluation result of the lubricating oil based on the actual quality level corresponding to the target indicator parameter includes: Determining whether the actual quality level is greater than or equal to a preset level threshold; If the actual quality level is greater than or equal to the preset level threshold, the evaluation result is determined to be that the lubricant is invalid, and a reminder message corresponding to the actual quality level is generated; otherwise, the evaluation result is determined to be that the lubricant is valid.

6. The method according to claim 5, characterized in that The step of generating the evaluation result of the lubricating oil based on the actual quality level corresponding to the target indicator parameter includes: In the case where the evaluation result is that the lubricant fails, detecting whether the actual quality level meets the preset warning condition; When it is detected that the actual quality level meets the preset warning condition, an alarm message of the lubricating oil is sent to the driver.

7. An evaluation device for vehicle lubricating oil, characterized in that: include: An acquisition module, used to acquire a current mileage accumulation value of the vehicle and at least one current environmental parameter of the gearbox; a calculation module, configured to match a target evaluation function set of the lubricant based on the current mileage accumulation value, and calculate an estimated index parameter of the lubricant at each quality level by using the target evaluation function set and the at least one current environmental parameter; An evaluation module is used to extract estimated index parameters that meet preset error conditions from the estimated index parameters under each quality level based on the current index parameters of the lubricant to determine the target index parameters, and generate an evaluation result of the lubricant based on the actual quality level corresponding to the target index parameters.

8. The device according to claim 7, characterized in that Also includes: a matching module, configured to match a current mileage interval of the vehicle based on the current mileage cumulative value before matching a target evaluation function set of lubricating oil based on the current mileage cumulative value; The extraction module is used to extract the parameter estimation function corresponding to each quality level from the pre-built evaluation function library based on the current mileage interval to obtain the target evaluation function set.

9. A vehicle, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the vehicle lubricant evaluation method according to any one of claims 1 to 6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the vehicle lubricant oil evaluation method according to any one of claims 1 to 6.

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