Method and device for measuring temperature of lubricating oil of vehicle gearbox, vehicle and medium

Abstract

The invention discloses a method and device for measuring the temperature of lubricating oil of a vehicle gearbox, a vehicle and a medium. The method comprises the steps that the quality of target lubricating oil, the pressure of current lubricating oil and the actual flow are obtained; determining the viscosity of the current lubricating oil according to the quality of the target lubricating oil, the pressure of the current lubricating oil and the actual flow; when the current viscosity of the lubricating oil is smaller than or equal to a preset viscosity threshold value, the current temperature of the lubricating oil is determined according to the current viscosity of the lubricating oil. According to the measuring method, holes do not need to be reserved in a gearbox structure, a temperature sensor does not need to be arranged, cables do not need to be laid in the gearbox structure, the relation between the flow and pressure of the lubricating oil and the viscosity of the lubricating oil is determined by calibrating work analysis data, and the viscosity of the lubricating oil is calculated by measuring the actual flow and pressure of the lubricating oil. And determining the lubricating oil temperature according to the lubricating oil viscosity and logic judgment. Therefore, the reliability of the gearbox is improved, the design difficulty and the manufacturing cost are reduced, and the temperature measurement accuracy of the lubricating oil is improved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a method for measuring the temperature of a vehicle transmission lubricating oil, a device for measuring the temperature of a vehicle transmission lubricating oil, a computer-readable storage medium and a vehicle. Background Art

[0002] At present, the number of commercial vehicles is increasing year by year. Compared with passenger cars, the working environment of commercial vehicles is often more severe. Working conditions such as high temperature, high cold, high altitude, and high load make commercial vehicles have higher requirements for the performance of transmission lubricants. Insufficient lubricant performance or deterioration of performance due to long-term use, and thus the inability to fully lubricate commercial vehicle parts is an important reason for the damage and failure of commercial vehicle parts. The temperature of the lubricating oil is an important parameter that can be used to judge the lubricating effect of the lubricating oil, so a variety of controllers require transmission oil temperature data to realize fault diagnosis and determine whether overheating and other faults occur. In order to obtain the lubricating oil temperature, a temperature sensor is generally installed in the transmission oil pool or oil circuit for measurement. This requires reserving space and corresponding structures for installing the transmission during the design of the transmission hardware structure, which increases the design difficulty and manufacturing cost. In addition, installing a temperature sensor in the oil pool or oil circuit also requires reserving holes for installing cables in the transmission structure, which reduces the reliability of the transmission.

[0003] The related technology is to establish multiple temperature measurement points located in the gearbox and not in the oil pool, and multiple ambient temperature measurement points located outside the gearbox during the calibration work, and then measure the oil pool temperature value under different temperature values ​​of the temperature measurement points outside the oil pool in the gearbox and the temperature values ​​of the ambient temperature measurement points outside the gearbox, and make a relationship table of three temperature values. During the actual operation of the gearbox, the temperature values ​​of the temperature measurement points outside the oil pool in different gearboxes and the temperature values ​​of the ambient temperature measurement points outside the gearbox are collected in real time to look up the table and obtain the corresponding oil pool temperature value. Although this method saves the cost of installing temperature sensors in the oil pool and laying cables, it is necessary to install multiple temperature sensors and their cables inside and outside the gearbox, which undoubtedly increases the cost of measuring oil temperature. At the same time, the measurement value of the temperature sensor is affected by many factors, such as the size of the ambient wind speed, whether the temperature sensor is splashed with liquid, etc., which makes the measured temperature value inaccurate, and then the oil temperature obtained by looking up the table is also inaccurate. With the increase of the use time of the lubricating oil, especially in some harsh working conditions, impurities will penetrate into it due to oxidation, hydrolysis and other reasons of the lubricating oil, causing the lubricating oil to deteriorate and affect the performance. The properties of lubricating oil will change with the increase of usage time, causing the actual temperature of the lubricating oil to change under the same working conditions, which in turn causes an increasing deviation between the lubricating oil temperature value obtained by looking up the table and the actual temperature value that changes due to the deterioration of the lubricating oil performance. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the first purpose of the present invention is to propose a method for measuring the temperature of the lubricating oil in a vehicle gearbox, obtain the quality of the target lubricating oil, the pressure of the current lubricating oil and the actual flow rate; determine the viscosity of the current lubricating oil according to the quality of the target lubricating oil, the pressure of the current lubricating oil and the actual flow rate; when the viscosity of the current lubricating oil is less than or equal to the preset viscosity threshold, determine the temperature of the current lubricating oil according to the viscosity of the current lubricating oil. The measurement method of the present invention does not require holes for installing cables in the gearbox structure, and the temperature sensor is set, that is, the cable is laid. The relationship between the flow rate and pressure of the lubricating oil and the viscosity of the lubricating oil is determined by calibrating the work analysis data, and the viscosity of the lubricating oil is calculated by measuring the actual flow rate and pressure of the lubricating oil, and the temperature of the gearbox is determined according to the viscosity of the lubricating oil and logical judgment. In this way, the reliability of the gearbox is improved, the design difficulty and manufacturing cost are reduced, and the accuracy of the temperature measurement of the lubricating oil is improved.

[0005] A second object of the present invention is to provide a device for measuring the temperature of lubricating oil in a vehicle transmission.

[0006] A third object of the present invention is to provide a computer-readable storage medium.

[0007] A fourth object of the present invention is to provide a vehicle.

[0008] To achieve the above-mentioned objectives, the first aspect of the present invention proposes a method for measuring the temperature of a vehicle transmission lubricating oil, obtaining the quality of the target lubricating oil, the current pressure of the lubricating oil and the actual flow rate; determining the viscosity of the current lubricating oil according to the quality of the target lubricating oil, the current pressure of the lubricating oil and the actual flow rate; and determining the temperature of the current lubricating oil according to the viscosity of the current lubricating oil when the viscosity of the current lubricating oil is less than or equal to a preset viscosity threshold.

[0009] According to an embodiment of the present invention, when the current viscosity of the lubricating oil is greater than a preset viscosity threshold, the current temperature of the lubricating oil is determined according to the current pressure and actual flow of the lubricating oil.

[0010] According to one embodiment of the present invention, the temperature of the current lubricating oil is determined according to the viscosity of the current lubricating oil, including: determining a viscosity-temperature relationship according to the quality of the target lubricating oil, wherein the viscosity-temperature relationship is used to express the relationship between the viscosity of the lubricating oil and the temperature of the lubricating oil under the same quality of the lubricating oil; determining the temperature of the current lubricating oil according to the viscosity of the current lubricating oil and the viscosity-temperature relationship.

[0011] According to one embodiment of the present invention, the quality of a target lubricant is obtained, including: when the time elapsed since the last operation of the vehicle is greater than a first preset time threshold and the current operation time of the vehicle is less than or equal to a second preset time threshold, obtaining the temperature of the lubricant, the pressure of the lubricant and the actual flow rate of the current lubricant, wherein the temperature of the lubricant is the housing temperature of the gearbox and the pressure of the lubricant is the housing pressure of the gearbox; determining the calculated flow rates of multiple lubricants according to the temperature of the lubricant and the pressure of the lubricant; and determining the quality of the target lubricant according to the actual flow rate of the current lubricant and the calculated flow rates of multiple lubricants.

[0012] According to one embodiment of the present invention, the quality of a target lubricant is determined based on an actual flow rate of a current lubricant and a calculated flow rate of multiple lubricants, including: obtaining the absolute value of the difference between the actual flow rate of the current lubricant and the calculated flow rate of each lubricant; and taking the quality of the lubricant corresponding to the minimum absolute value as the quality of the target lubricant.

[0013] According to one embodiment of the present invention, the above method also includes: when the time elapsed since the last operation of the vehicle is less than or equal to a first preset time threshold or the current operation time of the vehicle is greater than a second preset time threshold, stopping obtaining the quality of the target lubricant and using the quality of the target lubricant obtained last time as the quality of the target lubricant.

[0014] According to one embodiment of the present invention, the above method also includes: obtaining the mileage of the vehicle; determining a relationship table of lubricants of different qualities based on the mileage of the vehicle, wherein the relationship table is used to express the correspondence between the temperature of the lubricant, the pressure of the lubricant, the flow rate of the lubricant and the viscosity of the lubricant.

[0015] To achieve the above-mentioned purpose, the second aspect of the present invention proposes a device for measuring the temperature of a vehicle transmission lubricating oil, the device comprising: a first acquisition module for acquiring the quality of a target lubricating oil; a second acquisition module for acquiring the pressure of a current lubricating oil; a third acquisition module for acquiring the actual flow rate of the current lubricating oil; a first determination module for determining the viscosity of the current lubricating oil based on the quality of the target lubricating oil, the pressure of the current lubricating oil and the actual flow rate; and a second determination module for determining the temperature of the current lubricating oil based on the viscosity of the current lubricating oil when the viscosity of the current lubricating oil is less than or equal to a preset viscosity threshold.

[0016] To achieve the above-mentioned purpose, the third aspect of the present invention proposes a computer-readable storage medium, on which a vehicle transmission lubricating oil temperature measurement program is stored. When the vehicle transmission lubricating oil temperature measurement program is executed by a processor, the aforementioned vehicle transmission lubricating oil temperature measurement method is implemented.

[0017] To achieve the above-mentioned purpose, the fourth aspect of the present invention proposes a vehicle, including a memory, a processor, and a vehicle transmission lubricating oil temperature measurement program stored in the memory and executable on the processor. When the processor executes the vehicle transmission lubricating oil temperature measurement program, the aforementioned vehicle transmission lubricating oil temperature measurement method is implemented.

[0018] According to the vehicle gearbox lubricant temperature measurement method, device, vehicle and medium of the embodiment of the present invention, the quality of the target lubricant, the pressure of the current lubricant and the actual flow rate are obtained; the viscosity of the current lubricant is determined according to the quality of the target lubricant, the pressure of the current lubricant and the actual flow rate; when the viscosity of the current lubricant is less than or equal to the preset viscosity threshold, the temperature of the current lubricant is determined according to the viscosity of the current lubricant. The measurement method of the present invention does not require holes for installing cables in the gearbox structure. The temperature sensor is set up, that is, the cable is laid. The relationship between the flow rate and pressure of the lubricant and the viscosity of the lubricant is determined by calibrating the work analysis data, and the viscosity of the lubricant is calculated by measuring the actual flow rate and pressure of the lubricant. The temperature of the gearbox is determined according to the viscosity of the lubricant and logical judgment. In this way, the reliability of the gearbox is improved, the design difficulty and manufacturing cost are reduced, and the accuracy of the temperature measurement of the lubricant is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a flow chart of a vehicle gearbox calibration method according to some embodiments of the present invention;

[0020] Figure 2 is a flow chart of a method for measuring the temperature of lubricating oil in a vehicle gearbox according to some embodiments of the present invention;

[0021] Figure 3 A flow chart of a method for measuring the temperature of lubricating oil in a vehicle gearbox according to some other embodiments of the present invention;

[0022] Figure 4 A schematic diagram of the structure of a device for measuring the lubricating oil temperature of a vehicle transmission according to some embodiments of the present invention;

[0023] Figure 5 A block diagram of a device for measuring the temperature of lubricating oil in a vehicle transmission according to some embodiments of the present invention;

[0024] Figure 6 FIG. 1 is a schematic block diagram of a vehicle according to some embodiments of the present invention. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which 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 invention, and should not be construed as limiting the present invention.

[0026] The following describes in detail the method, device, vehicle and medium for measuring the temperature of the vehicle transmission lubricating oil according to the embodiments of the present invention with reference to the accompanying drawings.

[0027] In some embodiments, Figure 1 Flowchart of a method for calibrating a vehicle transmission according to some embodiments of the present invention.

[0028] Reference Figure 1 The vehicle gearbox calibration method of the embodiment of the present application may include the following steps:

[0029] S110, obtaining the corresponding relationship between viscosity and temperature of lubricating oils of different qualities, and establishing a temperature-viscosity relationship formula for lubricating oils of different qualities.

[0030] Specifically, the lubricating oil will produce an oil film on each friction pair of the transmission system to complete its lubrication function, and viscosity is the decisive indicator for evaluating its strength and fluidity. In actual use, the lubricating oil will undergo oxidative cracking and polymerization due to high temperature to produce colloid, which will increase the viscosity, reduce the lubricating performance of the lubricating oil, and cause excessive wear. During use, the lubricating oil will undergo condensation reactions to produce condensation products such as sludge and paint film, which will stick the components together, affect the relative movement between the components in the gearbox, and reduce the power transmission efficiency. Therefore, the viscosity of the lubricating oil is selected as the main physical and chemical indicator to measure the deterioration of the lubricating oil quality. The viscosity of the lubricating oil is represented by V, and the unit is square millimeters per second (mm 2 / s), the viscosity of the lubricating oil at t℃ is V t Indicates. The quality of lubricating oil is evaluated based on the viscosity change rate. The viscosity V at t℃ t Value range [V t1 ,V tn ] from the minimum value V t1 Take n viscosity values ​​evenly at regular intervals, and the viscosity value V at the ith t℃ ti The corresponding lubricant quality is q i Represents, where i=1,2,…,n.

[0031] For example, assuming n is 7, that is, from [V t1 ,V tn ], and they are V t1 、V t2 、V t3 、V t4 、V t5、V t6 、V t7 , lubricant quality i Viscosity value V at t℃ ti The relationship is shown in Table 1:

[0032] Table 1

[0033]

[0034] As can be seen from Table 1, lubricating oil quality can be divided into n types.

[0035] The viscosity of lubricating oil changes with temperature. This characteristic is called the viscosity-temperature characteristic of lubricating oil, and the quantitative index is the viscosity index. The viscosity of the same type of lubricating oil of different qualities at different temperatures is tested by a viscosity testing system, and the temperature-viscosity relationship formula of lubricating oil of different qualities is analyzed based on the test data. Among them, the temperature-viscosity relationship formula can be Soulder formula, Andrade formula, Namburu formula and Walther formula, etc. In the embodiment of the present invention, the temperature-viscosity relationship formula is taken as an example of Walther formula for illustration, but it is not intended to limit the present invention.

[0036] Exemplarily, the Walther formula is as follows:

[0037] log log(V+0.7)=A+BlogT

[0038] Where V represents the viscosity of the lubricating oil, in mm 2 / s, T represents the temperature of the lubricating oil in °C, and A and B represent constants.

[0039] A and B are calculated by fitting the viscosity data of the same type of lubricants of different qualities at different temperatures, and then the viscosity-temperature relationship formula of lubricants of different qualities is obtained.

[0040] S120, selecting the measurement range of the lubricating oil temperature, pressure and flow rate during the calibration process according to the type and properties of the selected lubricating oil, the vehicle working environment and hardware design parameters.

[0041] Specifically, different types of lubricants have different viscosity characteristics. Therefore, when measuring temperature, pressure, and flow, it is necessary to select an appropriate measurement range based on the type and properties of the lubricant. The vehicle working environment includes operating temperature and pressure changes. For example, the operating temperature of the vehicle in different environments may vary greatly. A high temperature environment (such as a desert) may require a higher temperature range, while a low temperature environment (such as a cold area) requires a lower temperature range. The vehicle may experience different pressure changes under different working conditions (such as high-speed driving, climbing, etc.), and a pressure range that can cover these changes should be selected for measurement. In addition, when selecting the measurement range, hardware design parameters also need to be considered. For example, the design pressure of the lubrication system should be used as the basis for selecting the pressure measurement range, that is, the range of the pressure sensor should be higher than the maximum working pressure of the system to avoid exceeding the measurement range of the sensor. The flow demand of the lubrication system also affects the selection of the flow sensor, that is, the range of the flow sensor should be determined based on the minimum and maximum flow requirements of the system.

[0042] For example, the measurement range of lubricating oil temperature may be -40°C to 100°C, the measurement range of lubricating oil pressure may be 10kPa to 2000kPa, and the measurement range of lubricating oil flow may be 10ml / s to 800ml / s. It should be noted that the measurement ranges of lubricating oil temperature, pressure, and flow may be determined according to actual conditions and are not specifically limited here.

[0043] S130, during the gearbox calibration work, the flow rate and viscosity data measured when using different qualities of lubricating oil under different temperature and pressure conditions are collected.

[0044] Specifically, each quality of lubricant needs to be measured. The measured temperature value T is selected at a certain interval within the temperature measurement range. k , select s temperature values ​​in total, where k = 1, 2, ..., s. Select the measured pressure P at regular intervals within the pressure measurement range l , select t pressure values ​​in total, where l = 1, 2, ..., t. Lubricating oil flow Q kl For a certain lubricating oil temperature T k and a certain pressure P l The corresponding flow Q kl , lubricating oil viscosity V kl For a certain lubricating oil temperature T k and a certain pressure P l The corresponding flow Q kl Each time the temperature T is collected k 、Pressure P l 、Flow Q kl and viscosity V kl Record once and collect the same temperature T multiple times k 、Pressure Pl Flow rate Q under conditions kl and viscosity V kl , take the average value of multiple measurement results as the actual flow rate Q kl and viscosity V kl , until at all temperatures T k 、Pressure P l Flow rate Q under the condition kl and viscosity V 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 Flow rate Q under conditions kl and viscosity V kl Collection of.

[0045] It should be noted that during the gearbox calibration process, the lubricating oil temperature T, pressure P, flow Q and viscosity V are collected using different sensors. The lubricating oil temperature T is measured by a temperature sensor installed in the gearbox oil pool or oil circuit. After the calibration work is completed, it is no longer necessary to install a temperature sensor and lay related cables in the gearbox; the pressure P is obtained by measuring the system oil circuit pressure through a pressure sensor; the flow Q is obtained by measuring the lubricating oil flow in the oil circuit through a flow sensor; the lubricating oil viscosity V can be measured directly through a viscosity sensor, or it can be measured in the laboratory using the same model gearbox with the same quality lubricating oil under the same temperature T, pressure P and flow Q conditions.

[0046] It is worth noting that the model, quantity and installation location of each sensor can be determined according to the actual situation, and there is no specific restriction here. However, the collected data must correspond to the model, quantity and installation location of the sensor. If the sensor model is changed, the quantity is increased or decreased, or the installation location is changed, the data must be collected again. This can prevent errors in the measurement results caused by changing the sensor model, increasing or decreasing the quantity, or changing the installation location. In addition, the lubricating oil temperature is measured by a temperature sensor installed in the gearbox oil pool or oil circuit. After the calibration work is completed, the temperature sensor is no longer installed in the gearbox and the related cables are no longer laid. If the viscosity sensor is used directly to measure the viscosity of the lubricating oil, the viscosity sensor is no longer installed in the gearbox and the related cables are no longer laid after the calibration work is completed. Because the viscosity sensor also needs to design the installation space and installation structure in the hardware structure, it increases the design difficulty and manufacturing cost, and installing the viscosity sensor in the oil pool or oil circuit also requires reserving holes for installing cables in the gearbox structure, which reduces the reliability of the gearbox.

[0047] S140, establishing a corresponding relationship table between oil temperature, pressure, flow rate and viscosity and lubricating oil quality.

[0048] Specifically, based on the data obtained in step S130, establish the relationship between temperature T, pressure P, flow rate Q and viscosity V and lubricating oil quality q i Relationship table.

[0049] For example, s=7 (seven temperature values) and t=7 (seven pressure values) are used for illustration, but they are not intended to limit the present invention. That is, within the measurement range of lubricating oil temperature (-40°C to 100°C), seven temperature values ​​are selected at regular intervals, namely T1, T2, T3, T4, T5, T6, and T7. Within the measurement range of lubricating oil pressure (10 kPa to 2000 kPa), seven pressure values ​​are selected at regular intervals, namely P1, P2, P3, P4, P5, P6, and P7. i The relationship between oil temperature, pressure, flow rate and viscosity corresponding to high-quality lubricating oil is shown in Table 2.

[0050] Table 2

[0051]

[0052] S150, establish a multivariate nonlinear function model of temperature, pressure and flow of lubricating oils of different qualities.

[0053] Specifically, according to the correspondence table between oil temperature, pressure, flow rate and viscosity and lubricant quality, the multivariate nonlinear regression method was used to take temperature T and pressure P as independent variables and flow rate Q as dependent variable to establish a multivariate nonlinear function model of temperature, pressure and flow rate of lubricants of different qualities.

[0054] S160, establish a multivariate nonlinear function model of pressure, flow and temperature of lubricating oils of different qualities.

[0055] Specifically, according to the correspondence table between oil temperature, pressure, flow rate and viscosity and lubricant quality, the multivariate nonlinear regression method was used to take pressure P and flow rate Q as independent variables and temperature T as dependent variable to establish a multivariate nonlinear function model of pressure, flow rate and temperature of lubricants of different qualities.

[0056] S170, establish a multivariate nonlinear function model of pressure, flow and viscosity of lubricating oils of different qualities.

[0057] Specifically, according to the correspondence table between oil temperature, pressure, flow rate and viscosity and lubricating oil quality, the multivariate nonlinear regression method was used to take pressure P and flow rate Q as independent variables and viscosity V as dependent variable to establish a multivariate nonlinear function model of pressure, flow rate and viscosity of lubricating oils of different qualities.

[0058] It should be noted that the multivariate nonlinear regression method can be polynomial regression, exponential regression, logarithmic regression, and artificial neural network, etc. The corresponding generated multivariate nonlinear function model can be a polynomial regression model, an exponential regression model, a logarithmic regression model, and an artificial neural network model, etc. The specific multivariate nonlinear regression method used can be determined according to actual conditions, and no specific restrictions are made here.

[0059] S180, after each vehicle has traveled a certain mileage, it is recalibrated to obtain a corresponding relationship table between oil temperature, pressure, flow rate and viscosity corresponding to different mileages and lubricant quality, a multivariate nonlinear function model of temperature, pressure and flow rate of lubricants of different qualities, a multivariate nonlinear function model of pressure, flow rate and temperature of lubricants of different qualities, and a multivariate nonlinear function model of pressure, flow rate and viscosity of lubricants of different qualities.

[0060] Specifically, as the vehicle mileage increases, the gearbox hardware structure and performance may change, and the sensor may age, resulting in distortion of the measurement data. To avoid this problem, the vehicle is required to be recalibrated every time it travels a certain mileage to obtain a corresponding relationship table between the oil temperature, pressure, flow rate, viscosity and lubricant quality corresponding to different mileages, and then obtain the multivariate nonlinear function model of temperature, pressure and flow rate of lubricants of different qualities with different mileages, the multivariate nonlinear function model of pressure, flow rate and temperature of lubricants of different qualities, and the multivariate nonlinear function model of pressure, flow rate and viscosity of lubricants of different qualities.

[0061] In this way, the calibration of the vehicle gearbox was completed, and the temperature-viscosity relationship formula of lubricants of different qualities was obtained, the corresponding relationship table of oil temperature, pressure, flow rate and viscosity corresponding to different mileage and lubricant quality, as well as the multivariate nonlinear function model of temperature, pressure and flow rate of lubricants of different qualities corresponding to different mileage, the multivariate nonlinear function model of pressure, flow rate and temperature of lubricants of different qualities, and the multivariate nonlinear function model of pressure, flow rate and viscosity of lubricants of different qualities were obtained.

[0062] Based on this, during the actual driving process of the vehicle, by collecting mileage data, initial ambient temperature, lubricating oil flow and pressure information, the lubricating oil quality and real-time temperature value are calculated through the above-mentioned pre-calibrated multivariate nonlinear function model and the temperature-viscosity relationship formula of the lubricating oil. In this way, there is no need to reserve holes for installing cables in the gearbox structure, and setting up temperature sensors means laying cables, which improves the reliability of the gearbox and the accuracy of lubricating oil temperature measurement, and reduces the design difficulty and manufacturing cost; determining the temperature of the lubricating oil based on the lubricating oil quality can to a certain extent avoid the influence of impurities infiltrating into the lubricating oil due to oxidation, hydrolysis and other reasons, which causes the lubricating oil to deteriorate and deteriorate, and further improves the accuracy of lubricating oil temperature measurement; in addition, the function of online measurement of lubricating oil quality can also be realized, effectively preventing excessive wear of gearbox parts caused by deterioration of lubricating oil quality, resulting in too fast reduction of service life, and even the possibility of causing safety accidents.

[0063] Figure 2 FIG. 1 is a flow chart of a method for measuring the temperature of a vehicle transmission lubricating oil according to some embodiments of the present invention. Figure 2 The method for measuring the temperature of the vehicle transmission lubricating oil of the embodiment of the present application may include the following steps:

[0064] S210, obtaining the quality of the target lubricating oil, the current pressure and the actual flow rate of the lubricating oil.

[0065] Specifically, the housing temperature and pressure of the gearbox are used as the temperature and pressure of the lubricating oil, and the multivariate nonlinear function model of the temperature, pressure and flow of lubricating oils of different qualities is input to calculate the calculated flow corresponding to multiple lubricating oils of different qualities, and the quality of the target lubricating oil is determined by comparing the multiple calculated flow rates with the actual flow rate of the current lubricating oil. The current lubricating oil pressure can be obtained by measuring the system oil circuit pressure through a pressure sensor, and the actual flow rate of the current lubricating oil can be obtained by measuring the lubricating oil flow rate in the oil circuit through a flow sensor. The specific acquisition method is not specifically limited here.

[0066] S220, determining the viscosity of the current lubricating oil according to the quality of the target lubricating oil, the pressure of the current lubricating oil, and the actual flow rate.

[0067] Specifically, after determining the quality of the target lubricant, a multivariate nonlinear function model of pressure, flow and viscosity corresponding to the quality of the target lubricant is selected, and the pressure and actual flow of the current lubricant are input into the multivariate nonlinear function model of pressure, flow and viscosity to calculate the viscosity of the current lubricant.

[0068] S230: When the viscosity of the current lubricating oil is less than or equal to a preset viscosity threshold, determine the temperature of the current lubricating oil according to the viscosity of the current lubricating oil. The preset viscosity threshold can be determined according to actual conditions and is not specifically limited here.

[0069] Specifically, the viscosity-temperature relationship curves of most types of lubricants show that the viscosity decreases as the temperature increases, and its trend is similar to the change of the exponential function curve. This means that when the temperature of the lubricant is in a lower temperature range, the viscosity of the lubricant is very sensitive to temperature changes, that is, as the temperature increases, the viscosity of the lubricant will drop sharply; and when the temperature reaches a higher temperature range, the sensitivity of the lubricant viscosity to temperature changes decreases, that is, the viscosity is less affected by temperature, the temperature changes greatly and the viscosity changes very little. This results in that when the temperature of the lubricant reaches a higher range, when the calculated viscosity fluctuates, the temperature change calculated by the viscosity-temperature relationship will be large, affecting the control effect. Therefore, a method for determining the temperature of the current lubricant is determined by comparing the viscosity of the current lubricant with a preset viscosity threshold, for example, determining the temperature of the current lubricant based on the viscosity of the current lubricant, or determining the temperature of the current lubricant based on the pressure and actual flow of the current lubricant.

[0070] Exemplarily, when the viscosity of the current lubricating oil is less than or equal to a preset viscosity threshold, the temperature of the current lubricating oil is determined according to the viscosity of the current lubricating oil, and the viscosity of the current lubricating oil is input into a viscosity-temperature relationship to calculate the temperature of the current lubricating oil.

[0071] The measurement method of the present invention does not require pre-set holes in the gearbox structure, the installation of temperature sensors, and the laying of cables. The relationship between the flow rate and pressure of the lubricating oil and the viscosity of the lubricating oil is determined by calibrating the work analysis data, the viscosity of the lubricating oil is calculated by measuring the actual flow rate and pressure of the lubricating oil, and the temperature of the lubricating oil is determined according to the viscosity of the lubricating oil and logical judgment. In this way, the reliability of the gearbox is improved, the design difficulty and manufacturing cost are reduced, and the accuracy of the lubricating oil temperature measurement is improved.

[0072] In some embodiments, when the viscosity of the current lubricating oil is greater than a preset viscosity threshold, the temperature of the current lubricating oil is determined according to the pressure and actual flow rate of the current lubricating oil.

[0073] Exemplarily, when the viscosity of the current lubricating oil is greater than a preset viscosity threshold, the temperature of the current lubricating oil is determined based on the pressure and actual flow of the current lubricating oil. For example, a corresponding multivariate nonlinear function model of pressure, flow and temperature is selected according to the quality of the target lubricating oil, and the pressure and actual flow of the current lubricating oil are input into the multivariate nonlinear function model of pressure, flow and temperature to calculate the temperature of the current lubricating oil.

[0074] In some embodiments, determining the temperature of the current lubricating oil based on the current viscosity of the lubricating oil includes: determining a viscosity-temperature equation based on the quality of the target lubricating oil, wherein the viscosity-temperature equation is used to express the relationship between the viscosity of the lubricating oil and the temperature of the lubricating oil under the same quality of the lubricating oil; determining the temperature of the current lubricating oil based on the viscosity of the current lubricating oil and the viscosity-temperature equation.

[0075] For example, when determining the temperature of the current lubricating oil according to the viscosity of the current lubricating oil, a corresponding viscosity-temperature relationship is selected according to the quality of the target lubricating oil, and the viscosity of the current lubricating oil is input into the viscosity-temperature relationship for calculation to obtain the temperature of the current lubricating oil. For example, the calculation formula for the temperature of the current lubricating oil is as follows:

[0076]

[0077] Wherein, T represents the current temperature of the lubricating oil, V represents the current viscosity of the lubricating oil, and A and B represent constants.

[0078] In some embodiments, obtaining the quality of the target lubricant includes: obtaining the temperature, pressure and actual flow rate of the lubricant when the time from the last end of the vehicle's operation is greater than a first preset time threshold and the vehicle's current operation time is less than or equal to a second preset time threshold, wherein the temperature of the lubricant is the housing temperature of the gearbox and the pressure of the lubricant is the housing pressure of the gearbox; determining the calculated flow rates of multiple lubricants according to the temperature and pressure of the lubricant; and determining the quality of the target lubricant according to the actual flow rate of the current lubricant and the calculated flow rates of multiple lubricants. The first preset time threshold and the second preset time threshold can be determined according to actual conditions and are not specifically limited here.

[0079] Specifically, after the vehicle stops running, the heat in the gearbox stops increasing, and as the gearbox discharges heat to the outside through heat exchange, convection, thermal radiation and other forms of heat transfer, the temperature of the lubricating oil decreases and eventually reaches the same temperature as the ambient temperature. If the time elapsed since the last time the vehicle ended running is greater than the first preset time threshold, it can be considered that the temperature of the lubricating oil in the gearbox has been reduced to the same as the ambient temperature through natural cooling or other cooling methods. After the vehicle starts running, the heat in the gearbox gradually begins to increase, but if the vehicle's running time this time is less than or equal to the second preset time threshold, it is considered that the lubricating oil temperature is not higher than the ambient temperature. Therefore, when the time elapsed since the last time the vehicle ended running is greater than the first preset time threshold and the vehicle's running time this time is less than or equal to the second preset time threshold, it can be considered that the temperature of the lubricating oil in the gearbox is consistent with the ambient temperature at this time, that is, the shell temperature of the gearbox is used as the temperature of the lubricating oil to determine the quality of the target lubricating oil.

[0080] Exemplarily, the temperature and pressure of the gearbox housing are detected by a temperature sensor and a pressure sensor arranged on the gearbox housing, and the gearbox housing temperature is used as the temperature of the lubricating oil, and the gearbox housing pressure is used as the pressure of the lubricating oil. The temperature and pressure of the lubricating oil are input into a multivariate nonlinear function model of the temperature, pressure and flow of lubricating oils of different qualities to calculate and obtain the calculated flow rates of multiple lubricating oils, and then the calculated flow rates of the multiple lubricating oils are compared with the actual flow rates of the current lubricating oils, and the lubricating oil quality corresponding to the calculated flow rate of the lubricating oil closest to the actual flow rate of the current lubricating oil is used as the quality of the target lubricating oil, and the quality of the target lubricating oil is recorded.

[0081] In some embodiments, the quality of the target lubricant is determined based on the actual flow rate of the current lubricant and the calculated flow rates of multiple lubricants, including: obtaining the absolute value of the difference between the actual flow rate of the current lubricant and the calculated flow rate of each lubricant; and taking the quality of the lubricant corresponding to the minimum absolute value as the quality of the target lubricant.

[0082] For example, the actual flow rate of the current lubricant is defined as Q, and the lubricants of different qualities q i The corresponding calculated flow rate Q i , where i = 1, 2, ..., n. The difference between the current actual flow rate and the calculated flow rate of each lubricant Z Q,i =Q-Q i The absolute value of the difference between the current actual flow rate and the calculated flow rate of each lubricating oil | Z Q,i ∣Sort in ascending order, and the quality of the lubricant corresponding to the minimum absolute value is the quality of the target lubricant.

[0083] In this way, determining the temperature of the lubricating oil based on its quality can, to a certain extent, avoid the influence of the lubricating oil temperature measurement caused by the infiltration of impurities into the lubricating oil due to oxidation, hydrolysis, etc., which leads to the deterioration of the lubricating oil, thereby improving the accuracy of the lubricating oil temperature measurement; it can also realize the function of online measurement of the lubricating oil quality, effectively preventing excessive wear of the gearbox parts caused by the deterioration of the lubricating oil quality, resulting in a rapid reduction in service life, and even the possibility of causing safety accidents.

[0084] In some embodiments, the above method also includes: when the time elapsed since the last operation of the vehicle is less than or equal to a first preset time threshold or the current operation time of the vehicle is greater than a second preset time threshold, stopping obtaining the quality of the target lubricant and using the quality of the target lubricant obtained last time as the quality of the target lubricant.

[0085] Specifically, when the time elapsed since the last end of the vehicle's operation is less than or equal to the first preset time threshold, it is considered that the gearbox cooling time is insufficient and the temperature of the lubricating oil in the gearbox has not dropped to the same level as the ambient temperature. When the vehicle's current running time is greater than the second preset time threshold, it is considered that the lubricating oil temperature is already higher than the ambient temperature due to the increase in the vehicle's operating heat. Therefore, when the time elapsed since the last end of the vehicle's operation is less than or equal to the first preset time threshold or the vehicle's current running time is greater than the second preset time threshold, the gearbox housing temperature cannot be used as the lubricating oil temperature, and the target lubricating oil quality is stopped at this time. Considering that the quality of the lubricating oil will hardly deteriorate significantly in a short period of time, the quality of the target lubricating oil obtained and saved last time is used as the target lubricating oil quality.

[0086] In some embodiments, the method further includes: obtaining the mileage of the vehicle; determining a relationship table of lubricants of different qualities according to the mileage of the vehicle, wherein the relationship table is used to express the corresponding relationship between the temperature of the lubricant, the pressure of the lubricant, the flow rate of the lubricant, and the viscosity of the lubricant. The mileage of the vehicle can be obtained through the vehicle information system equipped with the vehicle, and no specific limitation is made here.

[0087] Specifically, assuming that the design service life of the gearbox is 400,000 kilometers, it is set to be calibrated every 40,000 kilometers. Each calibration obtains a relationship table of lubricants of different qualities. Based on the relationship table of lubricants of different qualities, a multivariate nonlinear function model of temperature, pressure and flow of lubricants of different qualities with different mileages, a multivariate nonlinear function model of pressure, flow and temperature of lubricants of different qualities, and a multivariate nonlinear function model of pressure, flow and viscosity of lubricants of different qualities are established. In this way, a total of ten calibrations are performed to obtain ten sets of relationship tables of lubricants of different qualities and multivariate nonlinear function models corresponding to the relationship tables of each set of lubricants of different qualities.

[0088] Exemplarily, when the transmission mileage is within 40,000 kilometers, the relationship table and multivariate nonlinear function model corresponding to the mileage of 0-40,000 kilometers are used; when the transmission mileage is between 40,000 and 80,000 kilometers, the relationship table and multivariate nonlinear function model corresponding to the mileage of 40,000 to 80,000 kilometers are used, and so on.

[0089] In this way, by selecting a relationship table of lubricating oils of different qualities according to the mileage of the vehicle, the accuracy of the temperature measurement of the lubricating oil can be improved.

[0090] As a specific example, see Figure 3 The method for measuring the temperature of the vehicle transmission lubricating oil of the embodiment of the present application may further include the following steps:

[0091] S301, start.

[0092] S302, obtaining the mileage of the vehicle, and determining a relationship table and a function model for lubricants of different qualities according to the mileage of the vehicle.

[0093] S303, determining whether the time elapsed since the last end of the vehicle operation is greater than a first preset time threshold. If yes, executing S304; otherwise, executing S308.

[0094] S304: The housing temperature of the gearbox is regarded as the temperature of the lubricating oil.

[0095] S305, based on the collected temperature and pressure of the gearbox housing, the flow rates of lubricants of different qualities at the current temperature and pressure are calculated through a multivariate nonlinear function model of temperature, pressure and flow rate of lubricants of different qualities.

[0096] S306, comparing the calculated flow rate with the actual flow rate, calculating the error, taking the quality of the lubricating oil with the smallest absolute value of the error as the current quality of the lubricating oil, and recording the quality of the lubricating oil.

[0097] S307, determine whether the vehicle's current running time is greater than a second preset time threshold. If yes, execute S309; ​​otherwise, execute S304.

[0098] S308, the quality of the lubricating oil saved last time is used as the quality of the current lubricating oil.

[0099] S309, stop detecting the quality of the lubricating oil, obtain the current pressure and actual flow of the lubricating oil, select the corresponding viscosity-temperature relationship and the multivariate nonlinear function model of pressure, flow and viscosity according to the quality of the current lubricating oil, and calculate the viscosity of the current lubricating oil.

[0100] S310, determining whether the current viscosity of the lubricating oil is greater than a preset viscosity threshold. If yes, executing S311; otherwise, executing S312.

[0101] S311, obtaining the current pressure and actual flow of the lubricating oil, and calculating and obtaining the current temperature of the lubricating oil through a multivariate nonlinear function model of pressure, flow and temperature corresponding to the quality of the current lubricating oil.

[0102] S312, according to the viscosity of the current lubricating oil, the temperature of the current lubricating oil is calculated by using the viscosity-temperature relationship corresponding to the quality of the current lubricating oil.

[0103] S313, end.

[0104] As another specific example, see Figure 4The temperature sensor 1 is installed outside the gearbox housing or other parts of the vehicle. Its function is to measure the temperature data of the environment in which the vehicle is located in real time and send the data to the controller 4. The pressure sensor 2 can be installed in the oil circuit. Its function is to measure the pressure data of the lubricating oil in the gearbox in real time and send the data to the controller 4. The flow sensor 3 can be installed in the oil circuit to obtain the oil pump. 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. The controller 4 can be a separately designed single-chip microcomputer or an automatic transmission control unit (Transmission Control Unit, referred to as TCU) integrated in the gearbox. Its function is to summarize the temperature data input by the temperature sensor 1, the pressure data input by the pressure sensor 2, and the flow data input by the flow sensor 3, and at the same time obtain the current mileage data from the storage 5, comprehensively analyze the above data, calculate the quality and temperature of the current lubricating oil, send the lubricating oil quality to the storage 5, and send the lubricating oil quality, pressure, flow and temperature data to the CAN (Controller Area Network) bus 6 for use by other controllers of the vehicle. The storage 5 is used to store the lubricating oil quality data and take it out when the controller 4 needs it. The function of CAN bus 6 is to transmit data such as lubricating oil quality, pressure, flow and temperature.

[0105] In summary, the measurement method of the present invention does not require holes to be reserved in the gearbox structure for installing cables. Setting a temperature sensor means laying cables, which improves the reliability of the gearbox, reduces design difficulty and manufacturing cost, and improves market competitiveness. Determining the temperature of the lubricating oil based on the quality of the lubricating oil can, to a certain extent, avoid the influence of impurities infiltrating into the lubricating oil due to oxidation, hydrolysis, etc., which causes the lubricating oil to deteriorate and deteriorate, thereby improving the accuracy of the lubricating oil temperature measurement. In addition, the function of online measurement of the quality of the lubricating oil can also be realized, effectively preventing excessive wear of the gearbox parts caused by the deterioration of the lubricating oil quality, resulting in a rapid reduction in service life, and even the possibility of causing safety accidents.

[0106] Corresponding to the above-mentioned embodiment, the present application also proposes a device for measuring the temperature of the lubricating oil of a vehicle transmission.

[0107] Reference Figure 5 The device 400 for measuring the temperature of lubricating oil in a vehicle transmission includes: a first acquisition module 410 , a second acquisition module 420 , a third acquisition module 430 , a first determination module 440 and a second determination module 450 .

[0108] The first acquisition module 410 is used to acquire the quality of the target lubricant. The second acquisition module 420 is used to acquire the pressure of the current lubricant. The third acquisition module 430 is used to acquire the actual flow rate of the current lubricant. The first determination module 440 is used to determine the viscosity of the current lubricant according to the quality of the target lubricant, the pressure of the current lubricant and the actual flow rate. The second determination module 450 is used to determine the temperature of the current lubricant according to the viscosity of the current lubricant when the viscosity of the current lubricant is less than or equal to a preset viscosity threshold.

[0109] According to an embodiment of the present invention, the second determination module 450 is further configured to determine the current temperature of the lubricating oil according to the current pressure and actual flow of the lubricating oil when the viscosity of the current lubricating oil is greater than a preset viscosity threshold.

[0110] According to one embodiment of the present invention, the second determination module 450 is also used to determine a viscosity-temperature relationship according to the quality of the target lubricant, wherein the viscosity-temperature relationship is used to express the relationship between the viscosity of the lubricant and the temperature of the lubricant under the same quality of the lubricant; and determine the temperature of the current lubricant according to the viscosity of the current lubricant and the viscosity-temperature relationship.

[0111] According to one embodiment of the present invention, the first acquisition module 410 is specifically used to obtain the temperature of the lubricating oil, the pressure of the lubricating oil and the actual flow rate of the current lubricating oil when the time elapsed since the last operation of the vehicle is greater than a first preset time threshold and the current operation time of the vehicle is less than or equal to a second preset time threshold, wherein the temperature of the lubricating oil is the housing temperature of the gearbox and the pressure of the lubricating oil is the housing pressure of the gearbox; determine the calculated flow rates of multiple lubricating oils according to the temperature of the lubricating oil and the pressure of the lubricating oil; and determine the quality of the target lubricating oil according to the actual flow rate of the current lubricating oil and the calculated flow rates of multiple lubricating oils.

[0112] According to one embodiment of the present invention, the first acquisition module 410 is further used to obtain the absolute value of the difference between the actual flow rate of the current lubricant and the calculated flow rate of each lubricant; and the quality of the lubricant corresponding to the minimum absolute value is used as the quality of the target lubricant.

[0113] According to one embodiment of the present invention, the first acquisition module 410 is also used to stop acquiring the quality of the target lubricant when the time elapsed since the last operation of the vehicle is less than or equal to a first preset time threshold or the current operation time of the vehicle is greater than a second preset time threshold, and use the quality of the target lubricant acquired last time as the quality of the target lubricant.

[0114] According to one embodiment of the present invention, the mileage of a vehicle is obtained; and a relationship table of lubricants of different qualities is determined based on the mileage of the vehicle, wherein the relationship table is used to express the corresponding relationship between the temperature of the lubricant, the pressure of the lubricant, the flow rate of the lubricant, and the viscosity of the lubricant.

[0115] It should be pointed out that the above-mentioned explanation of the embodiment and beneficial effects of the method for measuring the lubricating oil temperature of a vehicle transmission is also applicable to the device for measuring the lubricating oil temperature of a vehicle transmission according to the embodiment of the present invention, and will not be elaborated here in order to avoid redundancy.

[0116] Corresponding to the above embodiments, the present application also proposes a computer-readable storage medium.

[0117] The computer-readable storage medium of the present application stores a vehicle transmission lubricating oil temperature measurement program thereon, and when the vehicle transmission lubricating oil temperature measurement program is executed by a processor, the aforementioned vehicle transmission lubricating oil temperature measurement method is implemented.

[0118] It should be pointed out that the above-mentioned explanation of the embodiment and beneficial effects of the method for measuring the temperature of the lubricating oil of a vehicle transmission is also applicable to the computer-readable storage medium of the embodiment of the present invention, and will not be elaborated here in order to avoid redundancy.

[0119] Corresponding to the above embodiments, the present application also proposes a vehicle.

[0120] See also Figure 6 As shown, the vehicle 600 of the present application includes a memory 610, a processor 620, and a vehicle transmission lubricating oil temperature measurement program stored in the memory 610 and executable on the processor 620. When the processor executes the vehicle transmission lubricating oil temperature measurement program, the aforementioned vehicle transmission lubricating oil temperature measurement method is implemented.

[0121] It should be pointed out that the above-mentioned explanation of the embodiment and beneficial effects of the method for measuring the temperature of the lubricating oil of a vehicle transmission is also applicable to the vehicle of the embodiment of the present invention, and will not be elaborated here in detail to avoid redundancy.

[0122] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented 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 purposes 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 portion with one or more wirings (electronic device), 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), an optical fiber 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, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0123] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of 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.

[0124] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" 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 invention. In this specification, the schematic representation of the above terms does 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 more embodiments or examples in a suitable manner.

[0125] 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 the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0126] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0127] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for measuring the temperature of lubricating oil in a vehicle gearbox, characterized in that: The method comprises: Obtain the quality of the target lubricant, the current lubricant pressure and the actual flow rate; determining the viscosity of the current lubricating oil according to the quality of the target lubricating oil, the pressure of the current lubricating oil and the actual flow rate; When the viscosity of the current lubricating oil is less than or equal to a preset viscosity threshold, the temperature of the current lubricating oil is determined according to the viscosity of the current lubricating oil.

2. The method for measuring the temperature of the vehicle transmission lubricating oil according to claim 1, characterized in that: The method further comprises: When the viscosity of the current lubricating oil is greater than the preset viscosity threshold, the temperature of the current lubricating oil is determined according to the pressure of the current lubricating oil and the actual flow rate.

3. The method for measuring the temperature of the vehicle gearbox lubricating oil according to claim 2, characterized in that: Determining the temperature of the current lubricating oil according to the current viscosity of the lubricating oil includes: Determining a viscosity-temperature relationship according to the quality of the target lubricating oil, wherein the viscosity-temperature relationship is used to express the relationship between the viscosity of the lubricating oil and the temperature of the lubricating oil under the same quality of the lubricating oil; The current temperature of the lubricating oil is determined according to the current viscosity of the lubricating oil and the viscosity-temperature relationship.

4. The method for measuring the temperature of the vehicle transmission lubricating oil according to claim 1, characterized in that: Obtain the quality of the target lubricant, including: When the time elapsed since the last operation of the vehicle is greater than a first preset time threshold and the current operation time of the vehicle is less than or equal to a second preset time threshold, obtaining the temperature of the lubricating oil, the pressure of the lubricating oil and the actual flow rate of the current lubricating oil, wherein the temperature of the lubricating oil is the shell temperature of the gearbox, and the pressure of the lubricating oil is the shell pressure of the gearbox; determining a calculated flow rate of a plurality of lubricating oils according to a temperature of the lubricating oil and a pressure of the lubricating oil; The quality of the target lubricating oil is determined according to the actual flow rate of the current lubricating oil and the calculated flow rates of the plurality of lubricating oils.

5. The method for measuring the temperature of the vehicle transmission lubricating oil according to claim 4, characterized in that: Determining the quality of the target lubricating oil according to the actual flow rate of the current lubricating oil and the calculated flow rates of the plurality of lubricating oils comprises: Obtaining the absolute value of the difference between the actual flow rate of the current lubricating oil and the calculated flow rate of each lubricating oil; The quality of the lubricating oil corresponding to the minimum absolute value is used as the quality of the target lubricating oil.

6. The method for measuring the temperature of the vehicle transmission lubricating oil according to claim 4, characterized in that: The method further comprises: When the time elapsed since the last operation of the vehicle is less than or equal to the first preset time threshold or the current operation time of the vehicle is greater than the second preset time threshold, the quality of the target lubricant is stopped from being acquired, and the quality of the target lubricant acquired last time is used as the quality of the target lubricant.

7. The method for measuring the temperature of the vehicle transmission lubricating oil according to any one of claims 1 to 6, characterized in that: Also includes: Obtaining the mileage of the vehicle; A relationship table of lubricants of different qualities is determined according to the mileage of the vehicle, wherein the relationship table is used to express the corresponding relationship between the temperature of the lubricant, the pressure of the lubricant, the flow rate of the lubricant, and the viscosity of the lubricant.

8. A device for measuring the temperature of lubricating oil in a vehicle gearbox, characterized in that: The device comprises: A first acquisition module, used for acquiring the quality of the target lubricating oil; The second acquisition module is used to obtain the current lubricating oil pressure; The third acquisition module is used to obtain the actual flow rate of the current lubricating oil; A first determination module, configured to determine the viscosity of the current lubricating oil according to the quality of the target lubricating oil, the pressure of the current lubricating oil and the actual flow rate; The second determination module is used to determine the temperature of the current lubricating oil according to the viscosity of the current lubricating oil when the viscosity of the current lubricating oil is less than or equal to a preset viscosity threshold.

9. A computer-readable storage medium, characterized in that: A vehicle gearbox lubricating oil temperature measurement program is stored thereon, and when the vehicle gearbox lubricating oil temperature measurement program is executed by a processor, a vehicle gearbox lubricating oil temperature measurement method according to any one of claims 1-7 is implemented.

10. A vehicle, characterized in that: The invention comprises a memory, a processor and a vehicle transmission lubricating oil temperature measurement program stored in the memory and executable on the processor. When the processor executes the vehicle transmission lubricating oil temperature measurement program, the vehicle transmission lubricating oil temperature measurement method according to any one of claims 1 to 7 is implemented.

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