Transmission inner cavity oil liquid distribution calculation method and device, vehicle and storage medium

Abstract

The invention provides a calculation method and device for oil liquid distribution in an inner cavity of a transmission, a vehicle and a storage medium, the method is applied to the field of vehicles, and the method comprises the steps that the oil liquid flow rate between a main oil cavity and each sub oil cavity is obtained according to the oil liquid height of the main oil cavity and the oil liquid height of each sub oil cavity, and then the current gravity driving flow rate of the main oil cavity is calculated; the current active oil pumping flow of the main oil cavity and the current lubricating flow of each sub oil cavity are obtained, and the new oil liquid height of the main oil cavity and the new oil liquid height of each sub oil cavity are determined based on the current gravity driving flow, the current active oil pumping flow and the current lubricating flow; and the step of obtaining the oil flow between the main oil cavity and each sub-oil cavity according to the oil height of the main oil cavity and the oil height of each sub-oil cavity is executed again until the new oil height of the main oil cavity and the new oil height of each sub-oil cavity meet the preset stable condition. According to the method, oil liquid distribution in the inner cavity of the transmission can be accurately calculated, calculation of full-dynamic working conditions is rapidly completed, and the design period is shortened.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and more particularly, to a calculation method, device, vehicle and storage medium for the oil distribution in the transmission cavity in the field of vehicles. Background Art

[0002] With the rapid development of new energy vehicles, the application of oil-cooled motors in transmissions is becoming more and more widespread, which puts forward higher requirements for the design of the overall oil level and oil quantity of the transmission. Since the oil distribution in the transmission cavity has an important impact on the running performance of the vehicle, unreasonable oil distribution may lead to problems such as cavitation noise, power interruption, vehicle jerk, and motor overheating. Therefore, it is very necessary to accurately calculate the oil distribution in the transmission cavity.

[0003] In the related art, the oil distribution in the transmission cavity is mainly calculated by methods such as transparent shell bench tests, CAD (Computer-Aided Design) software measurement, and CFD (Computational Fluid Dynamics) simulation.

[0004] However, the above calculation methods cannot quickly and accurately calculate the oil distribution in the transmission cavity, which may lead to problems such as cavitation noise, power interruption, vehicle jerk, and motor overheating during vehicle driving, and urgent solutions are needed. Summary of the Invention

[0005] The present application provides a calculation method, device, vehicle and storage medium for the oil distribution in the transmission cavity. The method can accurately calculate the oil distribution in the transmission cavity, quickly complete the calculation of the full dynamic working conditions, and at the same time, when the design scheme changes, the calculation model can be quickly corrected, so as to prevent the delay of the design cycle and shorten the design cycle.

[0006] First aspect, a method for calculating the oil fluid distribution in the transmission inner cavity is provided. The transmission inner cavity includes a main oil cavity and at least one sub-oil cavity. Wherein, the method includes: obtaining the oil fluid height of the main oil cavity and the oil fluid height of each sub-oil cavity, and obtaining the oil fluid flow rate between the main oil cavity and each sub-oil cavity according to the oil fluid height of the main oil cavity and the oil fluid height of each sub-oil cavity; calculating the current gravity-driven flow rate of the main oil cavity based on the oil fluid height of the main oil cavity, the oil fluid height of each sub-oil cavity and the oil fluid flow rate between the main oil cavity and each sub-oil cavity, and obtaining the current active oil pumping flow rate of the main oil cavity and the current lubrication flow rate of each sub-oil cavity; determining the new oil fluid height of the main oil cavity and the new oil fluid height of each sub-oil cavity based on the current gravity-driven flow rate, the current active oil pumping flow rate and the current lubrication flow rate, and based on the new oil fluid height of the main oil cavity and the new oil fluid height of each sub-oil cavity, re-executing the step of obtaining the oil fluid flow rate between the main oil cavity and each sub-oil cavity according to the oil fluid height of the main oil cavity and the oil fluid height of each sub-oil cavity until the new oil fluid height of the main oil cavity and the new oil fluid height of each sub-oil cavity both meet the preset stable conditions.

[0007] Through the above technical solution, by calculating the gravity-driven flow rate, the active oil pumping flow rate and the lubrication flow rate step by step and dynamically iteratively updating in combination with the time step, it can comprehensively reflect the behavior of the system under transient and steady states and the oil fluid distribution in the transmission inner cavity, so as to ensure that the transmission can meet the hydraulic function requirements under various working conditions. At the same time, when the design scheme changes, the calculation model can be quickly corrected, thus preventing the delay of the design cycle and shortening the design cycle.

[0008] Combined with the first aspect, in some possible implementation manners, the determining the new oil fluid height of the main oil cavity and the new oil fluid height of each sub-oil cavity based on the current gravity-driven flow rate, the current active oil pumping flow rate and the current lubrication flow rate includes: continuously updating the target oil fluid volume of the main oil cavity and the target oil fluid volume of each sub-oil cavity within a preset time step based on the current gravity-driven flow rate, the current active oil pumping flow rate and the current lubrication flow rate; obtaining the new oil fluid height of the main oil cavity according to the target oil fluid volume of the main oil cavity and obtaining the new oil fluid height of each sub-oil cavity according to the target oil fluid volume of each sub-oil cavity based on the preset oil fluid height-volume mapping relationship function.

[0009] Through the above technical solution, by calculating the final gravity-driven flow rate, the final active pumping flow rate, and the final lubrication flow rate within the total time step, the variation relationships of the gravity-driven flow rate, the final active pumping flow rate, and the final lubrication flow rate with time can be obtained, enabling a comprehensive understanding of the behavior of the system under transient and steady states, contributing to the optimization design, and ensuring that the system can meet the hydraulic function requirements under various working conditions.

[0010] Combined with the first aspect and the above implementation manners, in some possible implementation manners, continuously updating the target oil volume of the main oil chamber and the target oil volume of each sub-oil chamber within a preset time step includes: reading the initial gravity-driven flow rate of the main oil chamber, the initial active pumping flow rate of the main oil chamber, and the initial lubrication flow rate of each sub-oil chamber within the first time step; calculating the change amount of the oil volume of the main oil chamber within the first time step based on the initial gravity-driven flow rate, the initial active pumping flow rate, and the initial lubrication flow rate, and updating the target oil volume of the main oil chamber and the target oil volume of each sub-oil chamber based on the change amount of the oil volume of the main oil chamber.

[0011] Through the above technical solution, by calculating the final gravity-driven flow rate, the final active pumping flow rate, and the final lubrication flow rate within the total time step, the variation relationships of the gravity-driven flow rate, the final active pumping flow rate, and the final lubrication flow rate with time can be obtained, enabling a comprehensive understanding of the behavior of the system under transient and steady states, contributing to the optimization design, and ensuring that the system can meet the hydraulic function requirements under various working conditions.

[0012] Combined with the first aspect and the above implementation manners, in some possible implementation manners, the gravity-driven flow rate is

[0013] Q Gravity =(h2 - h1)*Q / Δh;

[0014] where, Q Gravity is the gravity-driven flow rate, h2 is the oil height of each sub-oil chamber, h1 is the oil height of the main oil chamber, Q is the oil flow rate, and Δh = |h2 - h1| is the absolute value of the difference in oil heights between the main oil chamber and each sub-oil chamber.

[0015] Through the above technical solution, the calculation of the gravity-driven flow rate is based on physical laws (such as Torricelli's law), which can accurately reflect the natural flow characteristics of the oil caused by the height difference, providing a reliable flow rate input for the entire dynamic simulation and ensuring the accuracy of the simulation.

[0016] Combined with the first aspect and the above implementation manners, in some possible implementation manners, obtaining the oil flow rate between the main oil chamber and each sub-oil chamber according to the oil height of the main oil chamber and the oil height of each sub-oil chamber includes: calculating the height difference between the oil height of the main oil chamber and the oil height of each sub-oil chamber; based on a preset oil chamber flow rate - height difference relationship, obtaining the oil flow rate between the main oil chamber and each sub-oil chamber according to the height difference between the oil height of the main oil chamber and the oil height of each sub-oil chamber.

[0017] Through the above technical solution, by calculating the oil height difference between the main oil chamber and each sub-oil chamber and combining with a preset oil chamber flow rate - height difference relationship, the oil flow rate between the main oil chamber and each sub-oil chamber can be accurately estimated, thereby improving the accuracy of flow rate calculation, avoiding the errors that may be brought by traditional empirical formulas, and providing basic data for subsequent volume update and height iteration.

[0018] Combined with the first aspect and the above implementation manners, in some possible implementation manners, the oil flow rate is

[0019]

[0020] where Q is the oil flow rate, Δh = |h2 - h1| is the absolute value of the oil height difference between the main oil chamber and each sub-oil chamber, S flow area is the area of the oil return hole, and g is the acceleration due to gravity.

[0021] Through the above technical solution, the oil flow rate between the main oil chamber and each sub-oil chamber, thereby improving the accuracy of flow rate calculation, avoiding the errors that may be brought by traditional empirical formulas, and providing basic data for subsequent volume update and height iteration.

[0022] Combined with the first aspect and the above implementation manners, in some possible implementation manners, obtaining the current active oil pumping flow rate of the main oil chamber and the current lubrication flow rate of each sub-oil chamber includes: calculating the current active oil pumping flow rate of the main oil chamber based on a preset simulation technology; determining the current lubrication flow rate of each sub-oil chamber according to the operating parameters of the transmission.

[0023] Through the above technical solution, by calculating the current active oil pumping flow rate of the main oil chamber based on a preset simulation technology (such as CFD computational fluid dynamics simulation), complex fluid dynamics characteristics can be comprehensively considered, such as pump wheel speed, oil return hole geometry, oil viscosity, etc., and the lubrication flow rate can be dynamically adjusted according to the operating parameters of the transmission (such as input speed, load torque, oil temperature, etc.), so as to ensure its matching with the actual working conditions.

[0024] Second aspect, a calculating device for the oil fluid distribution in the transmission inner cavity is provided. The transmission inner cavity includes a main oil cavity and at least one sub-oil cavity. Wherein, the device includes: a first obtaining module, configured to obtain the oil fluid height of the main oil cavity and the oil fluid height of each sub-oil cavity, and obtain the oil fluid flow rate between the main oil cavity and each sub-oil cavity according to the oil fluid height of the main oil cavity and the oil fluid height of each sub-oil cavity; a calculating module, configured to calculate the current gravity-driven flow rate of the main oil cavity based on the oil fluid height of the main oil cavity, the oil fluid height of each sub-oil cavity, and the oil fluid flow rate between the main oil cavity and each sub-oil cavity, and obtain the current active oil pumping flow rate of the main oil cavity and the current lubricating flow rate of each sub-oil cavity; a second obtaining module, configured to determine the new oil fluid height of the main oil cavity and the new oil fluid height of each sub-oil cavity based on the current gravity-driven flow rate, the current active oil pumping flow rate, and the current lubricating flow rate, and re-execute the step of obtaining the oil fluid flow rate between the main oil cavity and each sub-oil cavity according to the oil fluid height of the main oil cavity and the oil fluid height of each sub-oil cavity based on the new oil fluid height of the main oil cavity and the new oil fluid height of each sub-oil cavity until the new oil fluid height of the main oil cavity and the new oil fluid height of each sub-oil cavity both meet the preset stability conditions.

[0025] In combination with the second aspect, in some possible implementation manners, the second obtaining module includes: an updating unit, configured to continuously update the target oil fluid volume of the main oil cavity and the target oil fluid volume of each sub-oil cavity within a preset time step based on the current gravity-driven flow rate, the current active oil pumping flow rate, and the current lubricating flow rate; a first obtaining unit, configured to obtain the new oil fluid height of the main oil cavity according to the target oil fluid volume of the main oil cavity and obtain the new oil fluid height of each sub-oil cavity according to the target oil fluid volume of each sub-oil cavity based on a preset oil fluid height-volume mapping relationship function.

[0026] In combination with the second aspect and the above implementation manners, in some possible implementation manners, the updating unit includes: a reading sub-unit, configured to read the initial gravity-driven flow rate of the main oil cavity, the initial active oil pumping flow rate of the main oil cavity, and the initial lubricating flow rate of each sub-oil cavity within a first time step; a calculating sub-unit, configured to calculate the oil fluid volume change amount of the main oil cavity within the first time step based on the initial gravity-driven flow rate, the initial active oil pumping flow rate, and the initial lubricating flow rate, and update the target oil fluid volume of the main oil cavity and the target oil fluid volume of each sub-oil cavity based on the oil fluid volume change amount of the main oil cavity.

[0027] In combination with the second aspect and the above implementation manners, in some possible implementation manners, the gravity-driven flow rate is

[0028] Q Gravity=(h2 - h1)*Q / Δh;

[0029] Wherein, Q Gravity is the gravity-driven flow rate, h2 is the oil height of each sub-oil chamber, h1 is the oil height of the main oil chamber, Q is the oil flow rate, and Δh = |h2 - h1| is the absolute value of the difference in oil height between the main oil chamber and each sub-oil chamber.

[0030] Combined with the second aspect and the above implementation manners, in some possible implementation manners, the first acquisition module includes: a first calculation unit configured to calculate the height difference between the oil height of the main oil chamber and the oil height of each sub-oil chamber; and a second acquisition unit configured to obtain the oil flow rate between the main oil chamber and each sub-oil chamber based on a preset oil chamber flow rate-height difference relationship according to the height difference between the oil height of the main oil chamber and the oil height of each sub-oil chamber.

[0031] Combined with the second aspect and the above implementation manners, in some possible implementation manners, the oil flow rate is

[0032]

[0033] Wherein, Q is the oil flow rate, Δh = |h2 - h1| is the absolute value of the difference in oil height between the main oil chamber and each sub-oil chamber, S flow area is the area of the oil return hole, and g is the acceleration due to gravity.

[0034] Combined with the second aspect and the above implementation manners, in some possible implementation manners, the calculation module includes: a second calculation unit configured to calculate the current active oil pumping flow rate of the main oil chamber based on a preset simulation technique; and a determination unit configured to determine the current lubrication flow rate of each sub-oil chamber according to the operating parameters of the transmission.

[0035] In a third aspect, a vehicle is provided, including the calculation method for the oil distribution in the transmission cavity described in the above embodiments.

[0036] In a fourth aspect, a computer program product is provided, which includes: computer program code, when the computer program code runs on a computer, causing the computer to execute the method in the first aspect or any one of the possible implementation manners of the first aspect.

[0037] In a fifth aspect, a computer-readable storage medium is provided, which stores computer program code, when the computer program code runs on a computer, causing the computer to execute the method in the first aspect or any one of the possible implementation manners of the first aspect. Description of the Drawings

[0038] Figure 1 It is a schematic flowchart of a calculation method for the oil fluid distribution in the transmission inner cavity provided by an embodiment of the present application;

[0039] Figure 2 It is a schematic diagram of the principle of an oil fluid distribution model in the transmission inner cavity according to an embodiment of the present application;

[0040] Figure 3 It is a schematic flowchart of a CFD data evaluation process according to an embodiment of the present application;

[0041] Figure 4 It is a schematic diagram of the result of the oil fluid height distribution in the transmission inner cavity according to an embodiment of the present application;

[0042] Figure 5 It is a schematic block diagram of a calculation device for the oil fluid distribution in the transmission inner cavity provided by an embodiment of the present application;

[0043] Figure 6 It is a schematic diagram of the structure of a vehicle according to an embodiment of the present application. Detailed implementation manners

[0044] Next, the technical solutions in the present application will be clearly and elaborately described in conjunction with the accompanying drawings. Among them, in the description of the embodiments of the present application, unless otherwise specified, " / " means "or". For example, A / B may mean A or B. The "and / or" in the text is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B may mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality of" means two or more than two.

[0045] Hereinafter, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as implying or indicating relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0046] With the rapid development of new energy vehicles, the application of oil-cooled motors in transmissions has become increasingly widespread. The design of the oil level and oil quantity in the transmission has become more complex, and at the same time, higher requirements have been put forward for the overall oil level and oil quantity design of the transmission. Since the oil distribution in the transmission cavity has an important impact on the operating performance of the vehicle, unreasonable oil distribution may lead to problems such as suction noise, power interruption, vehicle jerk, and motor overheating. In related technologies, the calculation methods for the oil distribution in the transmission cavity mainly include transparent shell bench tests, CAD software measurements, and CFD simulation technologies. However, these methods have the following problems: (1) Transparent shell bench test: The production cycle of the transparent shell is long. When the design changes, a new transparent shell needs to be made, resulting in high costs. Moreover, due to factors such as complex shell features, occlusion by internal components or bench panels, and light refraction, the test observations are not clear or some positions cannot be observed, resulting in limited value for guiding design; (2) CAD software measurement: Since the volume of the oil splashing in the air cannot be accurately measured during the measurement process, the oil quantity measurement error is large; (3) CFD simulation technology: Its mesh size is small and the finite element calculation accuracy is high, but due to slow calculation speed, high hardware requirements, and long simulation cycle, the design cycle will be extended. Therefore, based on the problems existing in the above calculation methods, the embodiments of the present application provide a method that can quickly and accurately calculate the oil distribution in the transmission cavity, that is, a calculation method combining CFD and 1D coupling, which can accurately calculate the internal oil distribution of the transmission and quickly complete the calculation of the full dynamic working conditions. At the same time, when the design scheme changes, the calculation model can be quickly corrected to prevent delays in the design cycle and shorten the design cycle.

[0047] Figure 1 FIG. 4 is a schematic flow chart of a calculation method for the oil distribution in the transmission cavity provided by the embodiments of the present application, where the transmission cavity includes a main oil cavity and at least one sub-oil cavity.

[0048] Exemplarily, as Figure 1 shown, the method includes:

[0049] In step S101, obtain the oil height of the main oil cavity and the oil height of each sub-oil cavity, and obtain the oil flow rate between the main oil cavity and each sub-oil cavity according to the oil height of the main oil cavity and the oil height of each sub-oil cavity.

[0050] Optionally, in an embodiment of the present application, obtaining the oil flow rate between the main oil cavity and each sub-oil cavity according to the oil height of the main oil cavity and the oil height of each sub-oil cavity includes: calculating the height difference between the oil height of the main oil cavity and the oil height of each sub-oil cavity; based on the preset oil cavity flow rate - height difference relationship, obtain the oil flow rate between the main oil cavity and each sub-oil cavity according to the height difference between the oil height of the main oil cavity and the oil height of each sub-oil cavity.

[0051] Specifically, the oil distribution in the transmission inner cavity has an important impact on the vehicle's operating performance. Therefore, to avoid problems such as suction cavitation noise, power interruption, vehicle jerk, and motor overheating that may be caused by unreasonable oil distribution, the embodiments of the present application use a calculation method that combines CFD and 1D coupling, so as to accurately calculate the oil distribution inside the transmission.

[0052] Furthermore, in the embodiments of the present application, the transmission inner cavity can be divided into multiple cavities according to requirements. Among them, it can be designed as a main oil chamber Chamber1 and at least one sub-oil chamber. Each sub-oil chamber can be designed to surround the main oil chamber. Each sub-oil chamber can be represented as Chamber2. Or, it can be designed as multiple main oil chambers and multiple sub-oil chambers. Taking two cavities, Chamber1 and Chamber2, as a combination, where Chamber1 can be regarded as the main oil chamber and Chamber2 as the sub-oil chamber, the specific design method can be set according to actual engineering requirements and will not be specifically limited here. It should be noted that this process only increases the number of variables required for calculation, and the calculation principle remains unchanged. As Figure 2 shown, the embodiments of the present application take two cavities, namely a main oil chamber Chamber1 and a sub-oil chamber Chamber2, as an example. The following will specifically introduce the specific meanings of the relevant parameters involved in the embodiments of the present application in combination with Figure 2 the following content.

[0053] Among them, the oil height in the main oil chamber Chamber1 can be represented as h1, and the oil height in the sub-oil chamber Chamber2 can be represented as h2; the volume corresponding to the oil height h1 in the main oil chamber Chamber1 can be represented as V1, and the volume corresponding to the oil height h2 in the sub-oil chamber Chamber2 can be represented as V2; the oil height difference between the main oil chamber Chamber1 and the sub-oil chamber Chamber2 can be represented as Δh; the oil flow rate between the main oil chamber Chamber1 and the sub-oil chamber Chamber2 can be represented as Q; the oil return flow rate from the sub-oil chamber Chamber2 to the main oil chamber Chamber1, that is, the gravity-driven flow rate, can be represented as Q Gravity , and there is an oil return hole with a flow area of S between the main oil chamber Chamber1 and the sub-oil chamber Chamber2 to achieve the reflux filling of the main oil chamber Chamber1; the lubrication flow rate of the oil always pumped from the main oil chamber Chamber1 to the sub-oil chamber Chamber2 for component lubrication can be represented as Q flow area Lube ​; An active pump wheel with a pump-back function is installed in the sub-oil chamber Chamber2 to accelerate the return flow of the oil fluid from a separate oil passage to the oil sump. Among them, the flow rate provided by the active pump oil function that enhances the oil return capacity, that is, the active pump oil flow rate, can be expressed as Q Active-pump .

[0054] It should be noted that the flow rate value of the active pump oil flow rate is related to the oil fluid height h2 in the sub-oil chamber Chamber2 and the rotational speed of the pump wheel Active-pump wheel. When the rotational speed of the pump wheel Active-pump wheel remains unchanged, the greater the oil fluid height h2 in the sub-oil chamber Chamber2, the easier it is for the pump wheel to stir the oil, and the better the oil return effect, that is, the active pump oil flow rate Q Active-pump The larger the numerical value. Among them, the active pump oil flow rate Q Active-pump , the gravity-driven flow rate Q Gravity and the lubrication flow rate Q Lube are all in liters per minute

[0055] Specifically, in the embodiments of the present application, first, the oil volume V1 of the initial main oil chamber Chamber1 and the oil volume V2 of the initial sub - oil chamber Chamber2 are both known. Then, the mapping relationship between the oil volume V1 of the main oil chamber Chamber1 and the corresponding oil height h1, and the mapping relationship between the oil volume V2 of the sub - oil chamber Chamber2 and the corresponding oil height h2 can be confirmed by means of experiments or CAD software measurements. Their function expressions can be respectively expressed as V1 = F(h1) and V2 = F(h2). Secondly, based on the mapping relationship between the oil volume V1 of the main oil chamber Chamber1 and the corresponding oil height h1, the oil height h1 corresponding to the oil volume V1 of the main oil chamber Chamber1 can be obtained, and based on the mapping relationship between the oil volume V2 of the sub - oil chamber Chamber2 and the corresponding oil height h2, the oil height h2 corresponding to the oil volume V2 of the sub - oil chamber Chamber2 can be obtained. Thus, their function relationships can also be expressed as h1 = F(V1) and h2 = F(V2). Finally, from the oil height h1 of the main oil chamber Chamber1 and the oil height h2 of the sub - oil chamber Chamber2, the height difference Δh between the oil height h1 of the main oil chamber Chamber1 and the oil height h2 of the sub - oil chamber Chamber2 is calculated. Since the oil flow rate Q between the main oil chamber Chamber1 and the sub - oil chamber Chamber2 is related to the height difference Δh, a preset oil chamber flow rate - height difference relationship between the main oil chamber Chamber1 and the sub - oil chamber Chamber2 can be obtained. Then, according to Torricelli's law, based on the preset oil chamber flow rate - height difference relationship between the main oil chamber Chamber1 and the sub - oil chamber Chamber2 and the height difference Δh between the oil height h1 of the main oil chamber Chamber1 and the oil height h2 of the sub - oil chamber Chamber2, the oil flow rate Q between the main oil chamber Chamber1 and the sub - oil chamber Chamber2 can be calculated. Among them, the expression of the oil flow rate Q is as follows:

[0056]

[0057] Where Q is the oil flow rate, Δh = |h2 - h1| is the absolute value of the difference in oil heights between the main oil chamber Chamber1 and the sub - oil chamber Chamber2, S flow area is the area of the oil return hole, and g is the acceleration due to gravity.

[0058] By calculating the oil height difference between the main oil chamber Chamber1 and each sub - oil chamber Chamber2, and combining with the preset oil chamber flow - height difference relationship, the oil flow rate Q between the main oil chamber Chamber1 and each sub - oil chamber Chamber2 can be accurately estimated, thereby improving the accuracy of flow rate calculation, avoiding the errors that may be brought by traditional empirical formulas, and providing basic data for subsequent volume update and height iteration.

[0059] Among them, the main calculation method of the oil flow rate Q is as follows:

[0060] First, the oil volume V1 of the main oil chamber Chamber1 and the oil volume V2 of the sub - oil chamber Chamber2 at the first moment (T1 moment) are known, that is, the initial oil volume V1 of the main oil chamber Chamber1 and the initial oil volume V2 of the sub - oil chamber Chamber2. At this time, based on the mapping relationship V1 = F(h1) between the oil volume V1 of the main oil chamber Chamber1 and the corresponding oil height h1, and the mapping relationship V2 = F(h2) between the oil volume V2 of the sub - oil chamber Chamber2 and the corresponding oil height h2, the oil height h1 corresponding to the main oil chamber Chamber1 and the oil height h2 corresponding to the sub - oil chamber Chamber2 at the first moment are obtained; Secondly, the oil height difference Δh between the main oil chamber Chamber1 and the sub - oil chamber Chamber2 at the first moment is calculated according to the oil height h1 corresponding to the main oil chamber Chamber1 at the first moment and the oil height h2 corresponding to the sub - oil chamber Chamber2 at the first moment. At this time, according to the preset oil chamber flow - height difference relationship between the main oil chamber Chamber1 and the sub - oil chamber Chamber2, the oil flow rate Q at the first moment can be obtained, that is, Q = F(Δh);Finally, based on the oil volume V1 corresponding to the main oil chamber Chamber1 at the first moment, the oil volume V2 corresponding to the sub-oil chamber Chamber2, the oil flow rate Q, and the time interval step, calculate the oil volume V1' corresponding to the main oil chamber Chamber1 at the second moment (T2 moment) and the oil volume V2' corresponding to the sub-oil chamber Chamber2 at the second moment. At this time, if h2 > h1, then V1' = V1 + Q * step and V2' = V2 - Q * step. Then, according to the mapping relationship between the oil volume and the oil height, obtain the oil height h1' of the main oil chamber Chamber1 at the second moment and the oil height h2' of the sub-oil chamber Chamber2 respectively, and obtain the oil height difference Δh' between the main oil chamber Chamber1 and the sub-oil chamber Chamber2 at the second moment, that is, Δh' = |h2' - h1'|. At this time, the oil flow rate Q' at the second moment can be obtained according to the preset oil chamber flow rate - height difference relationship between the main oil chamber Chamber1 and the sub-oil chamber Chamber2, that is, Q' = F(Δh'). Furthermore, based on the oil volume V1' corresponding to the main oil chamber Chamber1 at the second moment, the oil volume V2' corresponding to the sub-oil chamber Chamber2, the oil flow rate Q', and the time interval step, calculate the oil volume V1" corresponding to the main oil chamber Chamber1 at the third moment and the oil volume V2" corresponding to the sub-oil chamber Chamber2 at the third moment. After obtaining the oil height h1" of the main oil chamber Chamber1 at the third moment and the oil height h2" of the sub-oil chamber Chamber2, further calculate the oil flow rate Q" at the third moment. That is to say, the oil flow rate Q at each moment is obtained based on the oil height h1 of the main oil chamber Chamber1 at each moment and the oil height h2 of the sub-oil chamber Chamber2 at each moment. Furthermore, after obtaining the oil height h1 of the main oil chamber Chamber1, the oil height h2 of the sub-oil chamber Chamber2, and the oil flow rate Q at each moment, iteratively calculate the oil volume at the next moment until the oil height h1 of the main oil chamber Chamber1 and the oil height h2 of the sub-oil chamber Chamber2 are stable.;

[0061] Specifically, first, during the period from the first moment to the second moment, that is, from the T1 moment to the T2 moment, taking 10 s from the T1 moment to the T2 moment as an example, it is necessary to calculate the oil volume V flowing from the main oil chamber Chamber1 into the sub-oil chamber Chamber2 within 10 s Gravity , and its flow rate per second is Q with the unit of liters per second, then Q Gravity=(h2 - h1)*Q / Δh, at this time, V Gravity = Q Gravity *(T2 - T1); Secondly, to represent the change of the oil flow rate Q and the main oil chamber Chamber1 and the sub - oil chamber Chamber2, when the oil height h2 in the sub - oil chamber Chamber2 - the oil height h1 in the main oil chamber Chamber1 is negative, at this time, the oil volume V2 in the sub - oil chamber Chamber2 is less, and the oil flows from the main oil chamber Chamber1 to the sub - oil chamber Chamber2, and the flow rate is negative. When the oil height h2 in the sub - oil chamber Chamber2 - the oil height h1 in the main oil chamber Chamber1 is positive, at this time, the oil volume V2 in the sub - oil chamber Chamber2 is more, and the oil flows from the sub - oil chamber Chamber2 to the main oil chamber Chamber1, and the flow rate is positive. Thus, when calculating the oil volume V1 in the main oil chamber Chamber1 and the oil volume V2 in the sub - oil chamber Chamber2 at the second moment, it can be further determined whether the oil flows from the main oil chamber Chamber1 into the sub - oil chamber Chamber2 or the oil flows from the sub - oil chamber Chamber2 into the main oil chamber Chamber1. For example, taking h2 > h1 as an example, when h2 > h1, the sum of the oil volume V1' in the main oil chamber Chamber1 at the second moment and V Gravity can be calculated, that is, V1' = V1 + V Gravity , and the difference between the oil volume V2' in the sub - oil chamber Chamber2 and V Gravity , that is, V2' = V2 - V Gravity ; Finally, based on the current V1' and V2', and the relevant parameters of the pump itself, calculate the current lubrication flow rate Q Lube and the current active pump oil flow rate Q Active-pump , so that V Lube = Q Lube *(T2 - T1), V Active-pump = Q Active-pump *(T2 - T1), at this time, the oil volume in the main oil chamber Chamber1 at the second moment is V1 T2 , the oil volume in the sub - oil chamber Chamber2 at the second moment is V2 T2 , that is, V1 T2 = V1 - V Gravity - V Active-pump + V Lube , V2 at the second moment T2 = V2 + V Gravity + V Active-pump - V Lube, so as to respectively obtain the oil height h1' of the main oil chamber Chamber1 and the oil height h2' of the sub - oil chamber Chamber2 at the second moment according to the mapping relationship between the oil volume and the oil height, and so on. Finally, the oil heights of the two chambers reach dynamic equilibrium.

[0062] Among them, the functional expression of the current gravity - driven flow rate is:

[0063] Q Gravity =(h2 - h1)*Q / Δh;

[0064] Among them, Q Gravity is the current gravity - driven flow rate, h2 is the oil height of the sub - oil chamber Chamber2, h1 is the oil height of the main oil chamber Chamber1, Q is the oil flow rate, and Δh = |h2 - h1| is the absolute value of the difference in oil heights between the main oil chamber Chamber1 and the sub - oil chamber Chamber2.

[0065] It should be noted that Torricelli's law is used to calculate the velocity or flow rate of a liquid flowing out of a container. It is mainly based on the principle of conservation of energy. When the oil flows from a height difference Δh, its potential energy is converted into kinetic energy. The relationship between kinetic energy and velocity can be expressed as:

[0066]

[0067] Among them, v is the velocity of the oil flowing out, Δh = |h2 - h1| is the absolute value of the difference in oil heights between the main oil chamber Chamber1 and each sub - oil chamber Chamber2, and g is the acceleration due to gravity.

[0068] At this time, the oil flow rate Q is determined by the velocity v of the oil flowing out and the area S of the oil return hole flow area decide.

[0069] Therefore, the calculation of the gravity - driven flow rate is based on physical laws (such as Torricelli's law), which can accurately reflect the natural flow characteristics of the oil due to the height difference, provide a reliable flow rate input for the entire dynamic simulation, and ensure the accuracy of the simulation.

[0070] In step S102, based on the oil height of the main oil chamber, the oil height of each sub - oil chamber, and the oil flow rate between the main oil chamber and each sub - oil chamber, calculate the current gravity - driven flow rate of the main oil chamber, and obtain the current active pumping flow rate of the main oil chamber and the current lubrication flow rate of each sub - oil chamber.

[0071] Specifically, based on the oil level h1 in the main oil chamber Chamber1 and the oil level h2 in the sub-oil chamber Chamber2 at the first moment obtained above, the oil level difference Δh between the oil level h1 in the main oil chamber Chamber1 and the oil level h2 in the sub-oil chamber Chamber2 at the first moment can be calculated, and the current gravity-driven flow rate Q of the main oil chamber Chamber1 can be calculated according to the oil level difference Δh and the oil flow rate Q. Gravity , and the specific function expression has been described above. To avoid redundancy, it will not be elaborated here.

[0072] Optionally, in an embodiment of the present application, obtaining the current active oil pumping flow rate of the main oil chamber and the current lubrication flow rate of each sub-oil chamber includes: calculating the current active oil pumping flow rate of the main oil chamber based on a preset simulation technique; determining the current lubrication flow rate of each sub-oil chamber according to the operating parameters of the transmission.

[0073] Among them, the preset simulation technique can be selected by those skilled in the art based on actual test requirements, and no specific limitation is made here.

[0074] Specifically, as Figure 3 shown, in the calculation method of the oil fluid distribution in the transmission inner cavity, the current active oil pumping flow rate Q Active-pump is an important parameter describing the oil return ability of the active pump from the sub-oil chamber Chamber2 to the main oil chamber Chamber1. Since the oil flow rate Q involves complex hydrodynamic characteristics and cannot be directly calculated by a simple theoretical formula, it is necessary to use a preset simulation technique, such as CFD simulation, for numerical evaluation.

[0075] Specifically, first, according to the actual structure of the transmission, a three-dimensional geometric model of the active pump area is established, mainly including key components such as the pump impeller, oil return holes, and oil chamber wall surfaces, and ensuring that the accuracy of the geometric model meets the actual physical dimensions. Second, mesh generation is carried out, and the geometric model is discretized using structured or unstructured meshes, and the meshes are refined near the pump impeller and in the oil return hole area to improve the calculation accuracy of the key areas. Third, the oil is defined as an incompressible Newtonian fluid, and its medium parameters are set, such as oil density and viscosity, pump impeller speed, etc., and a suitable turbulence model (such as the k-ε model or the SST k-ω model) is selected to simulate the turbulence effect, and then boundary conditions are selected. At the inlet boundary, the initial oil height and pressure of the sub-oil chamber Chamber2 are set. At the outlet boundary, the pressure or flow rate of the main oil chamber Chamber1 is set, and the no-slip conditions of the inner wall of the chamber and the surface of the pump impeller are defined. Third, based on the above selection of medium parameters and boundary conditions, simulation calculations are carried out, and the calculation results are processed. Among them, if transient flow is involved, a suitable time step needs to be set to capture the dynamic changes, ensuring that the numerical solution meets the residual convergence criterion and avoiding result deviations. Finally, a sensitivity analysis is carried out on the medium parameters (such as pump impeller speed, oil viscosity, oil return hole area, etc.). By changing the input parameters, their influence on the current active pump oil flow rate Q Active-pump is evaluated, and relevant curves or data tables are generated, and then the numerical value of the active pump oil flow rate Q Active-pump is extracted, and the variation trend of the flow rate with time and the stable values under different working conditions are analyzed. The numerical value of the current active pump oil flow rate Q Active-pump obtained by CFD is used as input for subsequent dynamic simulations, and by adjusting the pump impeller structure or the geometric shape of the oil return holes, the performance of the current active pump oil flow rate Q Active-pump is optimized. The CFD results are compared with the experimental data to verify the reliability of the model. If the numerical value of the current active pump oil flow rate Q Active-pump obtained by CFD is available, then the current active pump oil flow rate Q Active-pump and the oil height h2 of the sub-oil chamber Chamber2 are converted into a functional relationship. If the numerical value of the current active pump oil flow rate Q Active-pump obtained by CFD is not available, that is, the data is incorrect, then the CFD simulation is checked and recalculated. Among them, the functional relationship between the current active pump oil flow rate Q Active-pump and the oil height h2 of the sub-oil chamber Chamber2 can be expressed as:

[0076] Q Active-pump = F(h2)

[0077] It should be noted that during the CFD simulation of the current active pump oil flow rate Q Active-pump data, the amount of oil adhered to the components has been taken into account. Therefore, there is no need to artificially increase the data of the adhered oil amount based on empirical values.

[0078] Further, in the calculation method of the oil fluid distribution in the transmission inner cavity, the lubrication flow rate Q Lube refers to the amount of oil fluid pumped from the main oil chamber Chamber1 to the sub - oil chamber Chamber2, which is used to lubricate the gears, bearings and other moving parts inside the transmission, provide sufficient oil fluid for the components inside the transmission, thereby reducing friction, reducing wear and taking away heat. Since the operating conditions of the transmission (such as rotational speed, load, etc.) will constantly change, the lubrication flow rate also needs to be adjusted accordingly to meet different lubrication requirements. Therefore, the current lubrication flow rate Q Lube of the embodiment of the present application needs to be dynamically adjusted according to the operating parameters of the transmission (such as input and output rotational speeds, load conditions, oil temperature, oil pressure, etc.) to ensure that the lubrication requirements of the system under different operating conditions are met.

[0079] Thus, by calculating the current active oil pumping flow rate of the main oil chamber Chamber1 based on a preset simulation technology (such as CFD computational fluid dynamics simulation), complex fluid dynamics characteristics can be comprehensively considered, such as pump impeller rotational speed, oil return hole geometry, oil fluid viscosity, etc. The lubrication flow rate is dynamically adjusted according to the operating parameters of the transmission (such as input rotational speed, load torque, oil temperature, etc.), so as to ensure its matching with the actual operating conditions.

[0080] In step S103, based on the current gravity - driven flow rate, the current active oil pumping flow rate and the current lubrication flow rate, determine the new oil fluid height of the main oil chamber and the new oil fluid height of each sub - oil chamber, and based on the new oil fluid height of the main oil chamber and the new oil fluid height of each sub - oil chamber, re - execute the step of obtaining the oil fluid flow rate between the main oil chamber and each sub - oil chamber according to the oil fluid height of the main oil chamber and the oil fluid height of each sub - oil chamber until the new oil fluid height of the main oil chamber and the new oil fluid height of each sub - oil chamber both meet the preset stable conditions.

[0081] Among them, the preset stable conditions can be defined by those skilled in the art according to actual test requirements, and no specific limitation is made here.

[0082] Specifically, in order to comprehensively reflect the behavior of the system in transient and steady states, the embodiment of the present application can calculate the gravity - driven flow rate Q Gravity , the active oil pumping flow rate Q Active-pump and the lubrication flow rate Q Lube at each moment step - by - step, and perform dynamic iterative update in combination with the time step, and finally obtain the latest gravity - driven flow rate Q Gravity , the active oil pumping flow rate Q Active-pump and the lubrication flow rate Q Lube , that is, the final gravity - driven flow rate Q Gravity of the main oil chamber, the final active oil pumping flow rate Q Active-pumpThe final lubrication flow rate Q of the sub-oil chamber Lube , so as to determine the final gravity-driven flow rate Q of the main oil chamber Gravity , the final active oil pumping flow rate Q of the main oil chamber Active-pump and the final lubrication flow rate Q of the sub-oil chamber Lube , the final oil volume V1 of the main oil chamber and the final oil volume V2 of the sub-oil chamber can be obtained. Then, according to the mapping relationship between the oil volume and the oil height, the final oil height h1 corresponding to the final oil volume V1 of the main oil chamber and the final oil height h2 corresponding to the final oil volume V2 of the sub-oil chamber can be obtained. Finally, the liquid levels of the two chambers reach dynamic equilibrium to ensure that the transmission can meet the hydraulic function requirements under various working conditions.

[0083] Optionally, in an embodiment of the present application, based on the current gravity-driven flow rate, the current active oil pumping flow rate, and the current lubrication flow rate, the new oil height of the main oil chamber and the new oil height of each sub-oil chamber are determined, including: based on the current gravity-driven flow rate, the current active oil pumping flow rate, and the current lubrication flow rate, continuously update the target oil volume of the main oil chamber and the target oil volume of each sub-oil chamber within a preset time step; based on the preset oil height-volume mapping relationship function, obtain the new oil height of the main oil chamber according to the target oil volume of the main oil chamber, and at the same time obtain the new oil height of each sub-oil chamber according to the target oil volume of each sub-oil chamber.

[0084] Optionally, in an embodiment of the present application, continuously updating the target oil volume of the main oil chamber and the target oil volume of each sub-oil chamber within a preset time step includes: reading the initial gravity-driven flow rate of the main oil chamber, the initial active oil pumping flow rate of the main oil chamber, and the initial lubrication flow rate of each sub-oil chamber within the first time step; calculating the oil volume change amount of the main oil chamber within the first time step based on the initial gravity-driven flow rate, the initial active oil pumping flow rate, and the initial lubrication flow rate, and updating the target oil volume of the main oil chamber and the target oil volume of each sub-oil chamber based on the oil volume change amount of the main oil chamber.

[0085] Among them, the preset time step can be defined by those skilled in the art according to actual test requirements, or obtained through a limited number of computer simulations, and will not be specifically defined here.

[0086] Specifically, in the embodiment of the present application, based on the above calculation method, the oil flow rate Q, the current gravity-driven flow rate Q Gravity , the current active oil pumping flow rate Q Active-pump and the current lubrication flow rate Q Lube, iterative calculations need to be carried out within a preset time step to simulate the change of the oil distribution in the transmission inner cavity over time. Before the simulation calculation, the following definitions are made for relevant parameters. Set the maximum calculation time Tmax, which represents the total time length of the entire calculation process, and the preset time step, that is, the total number of time steps Steps, which means dividing the maximum calculation time Tmax into multiple time steps. Thus, the time interval Step can be obtained according to the maximum calculation time Tmax and the total number of time steps Steps. The time interval Step represents the time length of each time step, and its calculation formula can be expressed as Step = Tmax / Steps. The current time is T, which represents the current calculation time point, with an initial value of 0. The current time step is N, which represents the current calculation time step number, with an initial value of 1.

[0087] Specifically, first, change the current time T to T + step, and record T. Read the initial gravity-driven flow rate Q of the main oil chamber Chamber1 within the first time step, that is, at the time step N = N - 1. Gravity , the initial active oil pumping flow rate Q of the main oil chamber Chamber1 Active-pump and the initial lubrication flow rate Q of the sub-oil chamber Chamber2 Lube . At this time, the change in the oil volume V of the main oil chamber within the first time step can be calculated based on the initial gravity-driven flow rate, the initial active oil pumping flow rate, and the initial lubrication flow rate. change , and its expression can be V change = (Q Gravity + Q Active-pump - Q Lube ) / 60 * step.

[0088] Secondly, based on the change in the oil volume V of the main oil chamber Chamber1 change update the target oil volume V1 of the main oil chamber and the target oil volume V2 of the sub-oil chamber Chamber2. That is to say, within the first time step, the target oil volume V1 of the main oil chamber Chamber1 is updated to V1 + V change . At this time, the target oil volume V2 of the sub-oil chamber Chamber2 is updated to V2 - V change , and record the updated V1 and V2.

[0089] Again, based on the preset oil height - volume mapping relationship function, that is, the mapping relationship between the oil volume and the oil height, the new oil height h1 of the main oil chamber Chamber1 corresponding to the target oil volume of the main oil chamber Chamber1 obtained after the above update within the first time step is obtained, and the new oil height h2 of the sub - oil chamber Chamber2 corresponding to the updated target oil volume of the sub - oil chamber Chamber2 within the first time step is obtained, and the new oil height h1 of the main oil chamber Chamber1 and the new oil height h2 of the sub - oil chamber Chamber2 are recorded.

[0090] Finally, according to Q Gravity =(h2 - h1)*Q / Δh, Q Active-pump =F(h2) functional relationship and the determination method of Q Lube Based on the new oil height h1 of the main oil chamber Chamber1 and the new oil height h2 of the sub - oil chamber Chamber2 obtained within the first time step above, the new gravity - driven flow rate Q Gravity , the new active pumping flow rate Q Active-pump and the new lubrication flow rate Q Lube within the first time step are respectively re - confirmed, and the new gravity - driven flow rate Q Gravity , the new active pumping flow rate Q Active-pump and the new lubrication flow rate Q Lube within the first time step are recorded. After the recording is completed, the calculation of the next time step is entered, that is, the current time step becomes N = N + 1. At the same time, the new gravity - driven flow rate Q Gravity , the new active pumping flow rate Q Active-pump and the new lubrication flow rate Q Lube within the second time step are obtained according to the above calculation steps. By analogy, until the new oil heights of the main oil chamber Chamber1 and the sub - oil chamber Chamber2 both meet the preset stable conditions. At this time, the final oil volume V1 of the main oil chamber and the final oil volume V2 of the sub - oil chamber can be obtained according to the final gravity - driven flow rate Q Gravity of the main oil chamber, the final active pumping flow rate Q Active-pump of the main oil chamber and the final lubrication flow rate Q Lube of the sub - oil chamber. Furthermore, according to the mapping relationship between the oil volume and the oil height, the final oil height h1 corresponding to the final oil volume V1 of the main oil chamber and the final oil height h2 corresponding to the final oil volume V2 of the sub - oil chamber are obtained, and finally the dynamic balance of the oil heights in the two chambers is achieved.

[0091] Furthermore, as Figure 4As shown, after obtaining the final gravity-driven flow rate of the main oil chamber Chamber1, the final active oil pumping flow rate of the main oil chamber Chamber1, and the final lubrication flow rate of the sub-oil chamber Chamber2 within a preset time step, the flow rate values after the oil level stabilizes can be obtained. These flow rate values reflect the dynamic behavior of the system at different time points, including the transient changes in the initial stage and the finally stabilized state, to determine whether the hydraulic function requirements meet the design criteria. At this time, when the working conditions and the digital model change, the digital model change of the working conditions can be flexibly responded to. That is to say, when the working conditions (such as input speed, load, etc.) or the digital model (such as geometric structure, oil characteristics, etc.) change, only the relevant function data affected in the calculation model needs to be adjusted, and the calculation model can be quickly corrected.

[0092] Thus, by calculating the final gravity-driven flow rate Q Gravity 、the final active oil pumping flow rate Q Active-pump and the final lubrication flow rate Q Lube within the total time step, the variation relationship of the gravity-driven flow rate Q Gravity 、the final active oil pumping flow rate Q Active-pump and the final lubrication flow rate Q Lube with time can be obtained, enabling a comprehensive understanding of the system's behavior in the transient and steady states, which helps optimize the design and ensure that the system can meet the hydraulic function requirements under various working conditions.

[0093] In summary, based on the analysis of the above specific embodiments, the present application can achieve the following beneficial effects:

[0094] (1) Provide accurate dynamic analysis capabilities. By calculating the gravity-driven flow rate Q Gravity 、the active oil pumping flow rate Q Active-pump and the lubrication flow rate Q Lube step by step and dynamically iteratively updating in combination with the time step, the behavior of the system in the transient and steady states can be comprehensively reflected to ensure that the transmission can meet the hydraulic function requirements under various working conditions;

[0095] (2) Achieve efficient time management. By defining the maximum time Tmax, the total time step Steps, and the time interval Step, the time framework of the simulation process is clarified, and then the calculation is gradually advanced based on the time step, which not only ensures the calculation accuracy but also avoids unnecessary redundant calculations and improves the simulation efficiency;

[0096] (3) Have good adaptability and flexibility. When the working conditions (such as input speed, load, etc.) or the digital model (such as geometric structure, oil characteristics, etc.) change, only the relevant function data affected in the calculation model needs to be adjusted. The modular design of the model allows local adjustment without affecting the overall framework, simplifies the correction process, and significantly improves the work efficiency;

[0097] (4) Support standardized verification. By extracting the values after the oil level stabilizes, it is possible to directly determine whether the system meets the standards for hydraulic function requirements, thus providing a clear basis for design and avoiding errors that may be caused by subjective judgment.

[0098] In summary, according to the calculation method of the oil distribution in the transmission inner cavity according to the embodiments of the present application, the oil flow rate between the main oil cavity and each sub - oil cavity is obtained based on the oil level of the main oil cavity and the oil level of each sub - oil cavity. Then, the current gravity - driven flow rate of the main oil cavity is calculated, and the current active oil - pumping flow rate of the main oil cavity and the current lubrication flow rate of each sub - oil cavity are obtained. Based on the current gravity - driven flow rate, the current active oil - pumping flow rate, and the current lubrication flow rate, the new oil levels of the main oil cavity and each sub - oil cavity are determined respectively, and the step of obtaining the oil flow rate between the main oil cavity and each sub - oil cavity based on the oil level of the main oil cavity and the oil level of each sub - oil cavity is re - executed until the new oil levels of the main oil cavity and each sub - oil cavity both meet the preset stability conditions. This method can accurately calculate the oil distribution in the transmission inner cavity and quickly complete the calculation of the full - dynamic working conditions, shortening the design cycle.

[0099] Figure 5 It is a schematic structural diagram of a calculation device for the oil distribution in the transmission inner cavity provided by the embodiments of the present application.

[0100] Exemplarily, as Figure 5 shown, the device may include: a first acquisition module 100, a calculation module 200, and a second acquisition module 300.

[0101] Among them, the first acquisition module 100 is used to acquire the oil level of the main oil cavity and the oil level of each sub - oil cavity, and obtain the oil flow rate between the main oil cavity and each sub - oil cavity according to the oil level of the main oil cavity and the oil level of each sub - oil cavity;

[0102] The calculation module 200 is used to calculate the current gravity - driven flow rate of the main oil cavity based on the oil level of the main oil cavity, the oil level of each sub - oil cavity, and the oil flow rate between the main oil cavity and each sub - oil cavity, and obtain the current active oil - pumping flow rate of the main oil cavity and the current lubrication flow rate of each sub - oil cavity;

[0103] The second acquisition module 300 is used to determine the new oil level of the main oil cavity and the new oil level of each sub - oil cavity based on the current gravity - driven flow rate, the current active oil - pumping flow rate, and the current lubrication flow rate, and re - execute the step of obtaining the oil flow rate between the main oil cavity and each sub - oil cavity according to the oil level of the main oil cavity and the oil level of each sub - oil cavity based on the new oil level of the main oil cavity and the new oil level of each sub - oil cavity until the new oil levels of the main oil cavity and each sub - oil cavity both meet the preset stability conditions.

[0104] Optionally, in an embodiment of the present application, the second acquisition module 300 includes:

[0105] An update unit, configured to continuously update the target oil volume of the main oil chamber and the target oil volume of each sub-oil chamber within a preset time step based on the current gravity-driven flow rate, the current active pump oil flow rate, and the current lubrication flow rate;

[0106] A first acquisition unit, configured to obtain the new oil height of the main oil chamber based on the target oil volume of the main oil chamber according to a preset oil height-volume mapping relationship function, and at the same time obtain the new oil height of each sub-oil chamber according to the target oil volume of each sub-oil chamber.

[0107] Optionally, in an embodiment of the present application, the update unit includes:

[0108] A reading subunit, configured to read the initial gravity-driven flow rate of the main oil chamber, the initial active pump oil flow rate of the main oil chamber, and the initial lubrication flow rate of each sub-oil chamber within the first time step;

[0109] A calculation subunit, configured to calculate the oil volume change amount of the main oil chamber within the first time step based on the initial gravity-driven flow rate, the initial active pump oil flow rate, and the initial lubrication flow rate, and update the target oil volume of the main oil chamber and the target oil volume of each sub-oil chamber based on the oil volume change amount of the main oil chamber.

[0110] Optionally, in an embodiment of the present application, the gravity-driven flow rate is

[0111] Q Gravity =(h2 - h1)*Q / Δh;

[0112] Wherein, Q Gravity is the gravity-driven flow rate, h2 is the oil height of each sub-oil chamber, h1 is the oil height of the main oil chamber, Q is the oil flow rate, and Δh = |h2 - h1| is the absolute value of the difference in oil height between the main oil chamber and each sub-oil chamber.

[0113] Optionally, in an embodiment of the present application, the first acquisition module 100 includes:

[0114] A first calculation unit, configured to calculate the height difference between the oil height of the main oil chamber and the oil height of each sub-oil chamber;

[0115] A second acquisition unit, configured to obtain the oil flow rate between the main oil chamber and each sub-oil chamber based on a preset oil chamber flow rate-height difference relationship according to the height difference between the oil height of the main oil chamber and the oil height of each sub-oil chamber.

[0116] Optionally, in an embodiment of the present application, the oil flow rate is

[0117]

[0118] Wherein, Q is the oil flow rate, Δh = |h2 - h1| is the absolute value of the difference in oil height between the main oil chamber and each sub-oil chamber, and S flow area is the area of the oil return hole, and g is the acceleration due to gravity.

[0119] Optionally, in an embodiment of the present application, the calculation module 200 includes:

[0120] A second calculation unit for calculating the current active oil pumping flow rate of the main oil chamber based on a preset simulation technique;

[0121] A determination unit for determining the current lubrication flow rate of each sub-oil chamber according to the operating parameters of the transmission.

[0122] In summary, according to the calculation device for the oil distribution in the transmission inner cavity of the embodiment of the present application, the oil flow rate between the main oil chamber and each sub-oil chamber is obtained based on the oil height of the main oil chamber and the oil height of each sub-oil chamber, and then the current gravity-driven flow rate of the main oil chamber is calculated, and the current active oil pumping flow rate of the main oil chamber and the current lubrication flow rate of each sub-oil chamber are obtained. Based on the current gravity-driven flow rate, the current active oil pumping flow rate and the current lubrication flow rate, the new oil heights of the main oil chamber and each sub-oil chamber are respectively determined, and the step of obtaining the oil flow rate between the main oil chamber and each sub-oil chamber based on the oil height of the main oil chamber and the oil height of each sub-oil chamber is re-executed until the new oil heights of the main oil chamber and each sub-oil chamber both meet the preset stability conditions. This method can accurately calculate the oil distribution in the transmission inner cavity and quickly complete the calculation of the full dynamic working conditions, shortening the design cycle.

[0123] Figure 6 A schematic structural diagram of a vehicle provided by an embodiment of the present application.

[0124] It should be understood that the method introduced above can be applied to Figure 6 the vehicle with the structure shown.

[0125] In addition, an embodiment of the present application also protects a device, which may include a memory and a processor. Among them, the memory stores executable program code, and the processor is used to call and execute the executable program code to execute the calculation method for the oil distribution in the transmission inner cavity provided by the embodiment of the present application.

[0126] Furthermore, the device further includes: a communication interface 603 for communication between the memory 601 and the processor 602.

[0127] In this embodiment, the device can be divided into functional modules according to the above method examples. For example, it can correspond to each functional module, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware. It should be noted that the division of modules in this embodiment is illustrative, only a logical function division, and there can be other division methods in actual implementation.

[0128] It should be noted that all relevant contents of each step involved in the above method embodiment can be cited in the function description of the corresponding functional module, and will not be elaborated here.

[0129] It should be understood that the device provided in this embodiment is used to execute the above method for calculating the oil fluid distribution in the transmission inner cavity, so the same effect as the above implementation method can be achieved.

[0130] In the case of adopting an integrated unit, the device can include a processing module and a storage module. Among them, when the device is applied to a vehicle, the processing module can be used to control and manage the actions of the vehicle. The storage module can be used to support the vehicle to execute mutual program codes, etc.

[0131] Among them, the processing module can be a processor 602 or a controller, which can implement or execute various exemplary logical blocks, modules and circuits described in combination with the disclosure of this application. The processor 602 can also be a combination for implementing computing functions, such as including a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc. The storage module can be a memory 601.

[0132] In addition, the device provided in the embodiment of this application can specifically be a chip, a component or a module. The chip can include a connected processor 602 and a memory 601; among them, the memory 601 is used to store instructions. When the processor calls and executes the instructions, the chip can execute the method for calculating the oil fluid distribution in the transmission inner cavity provided in the above embodiment.

[0133] This embodiment also provides a computer-readable storage medium. Computer program code is stored in the computer-readable storage medium. When the computer program code runs on a computer, it causes the computer to execute the above relevant method steps to implement the method for calculating the oil fluid distribution in the transmission inner cavity provided in the above embodiment.

[0134] This embodiment also provides a computer program product. When the computer program product runs on a computer, it causes the computer to execute the above relevant steps to implement the method for calculating the oil fluid distribution in the transmission inner cavity provided in the above embodiment.

[0135] Among them, the device, computer-readable storage medium, computer program product or chip provided in this embodiment are all used to execute the corresponding method provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding method provided above, and will not be elaborated here.

[0136] Through the description of the above embodiments, those skilled in the art can understand that for the convenience and brevity of description, only the above division of each functional module is used as an example. In actual applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0137] In the embodiments provided in this application, it should be understood that the disclosed device and method can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection of the device or unit can be electrical, mechanical or other forms.

[0138] The above content is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application, and all should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A method for calculating the oil distribution in a transmission cavity, characterized in that: The transmission inner cavity includes a main oil cavity and at least one sub-oil cavity, wherein the method includes the following steps: Obtaining the oil height of the main oil chamber and the oil height of each sub-oil chamber, and obtaining the oil flow rate between the main oil chamber and each sub-oil chamber according to the oil height of the main oil chamber and the oil height of each sub-oil chamber; Calculating the current gravity-driven flow rate of the main oil chamber based on the oil height of the main oil chamber, the oil height of each sub-oil chamber, and the oil flow rate between the main oil chamber and each sub-oil chamber, and obtaining the current active pump oil flow rate of the main oil chamber and the current lubrication flow rate of each sub-oil chamber; Based on the current gravity-driven flow, the current active pump oil flow and the current lubrication flow, the new oil height of the main oil chamber and the new oil height of each sub-oil chamber are determined, and based on the new oil height of the main oil chamber and the new oil height of each sub-oil chamber, the step of obtaining the oil flow rate between the main oil chamber and each sub-oil chamber according to the oil height of the main oil chamber and the oil height of each sub-oil chamber is re-executed until the new oil height of the main oil chamber and the new oil height of each sub-oil chamber meet the preset stability conditions.

2. The method according to claim 1, characterized in that: The determining of the new oil height of the main oil chamber and the new oil height of each sub-oil chamber based on the current gravity-driven flow, the current active pump oil flow and the current lubrication flow comprises: Based on the current gravity-driven flow rate, the current active pump oil flow rate, and the current lubrication flow rate, continuously updating the target oil volume of the main oil chamber and the target oil volume of each sub-oil chamber within a preset time step; Based on a preset oil height-volume mapping relationship function, the new oil height of the main oil chamber is obtained according to the target oil volume of the main oil chamber, and the new oil height of each sub-oil chamber is obtained according to the target oil volume of each sub-oil chamber.

3. The method according to claim 2, characterized in that The continuously updating the target oil volume of the main oil chamber and the target oil volume of each sub-oil chamber within a preset time step includes: Reading the initial gravity-driven flow rate of the main oil chamber, the initial active pump oil flow rate of the main oil chamber, and the initial lubrication flow rate of each sub-oil chamber within the first time step; The oil volume change of the main oil chamber within the first time step is calculated based on the initial gravity-driven flow, the initial active pump oil flow and the initial lubrication flow, and the target oil volume of the main oil chamber and the target oil volume of each sub-oil chamber are updated based on the oil volume change of the main oil chamber.

4. The method according to claim 3, characterized in that The gravity driven flow rate is, Q Gravity =(h2-h1)*Q / Δh; Among them, Q Gravity is the gravity driven flow rate, h2 is the oil height of each sub-oil chamber, h1 is the oil height of the main oil chamber, Q is the oil flow rate, and Δh=|h2-h1| is the absolute value of the difference in oil height between the main oil chamber and each sub-oil chamber.

5. The method according to claim 1, characterized in that The step of obtaining the oil flow rate between the main oil chamber and each sub-oil chamber according to the oil height of the main oil chamber and the oil height of each sub-oil chamber comprises: Calculating the height difference between the oil height of the main oil chamber and the oil height of each sub-oil chamber; Based on a preset oil chamber flow-height difference relationship, the oil flow rate between the main oil chamber and each sub-oil chamber is obtained according to the height difference between the oil height of the main oil chamber and the oil height of each sub-oil chamber.

6. The method according to claim 4, characterized in that The oil flow rate is, Where Q is the oil flow rate, Δh = |h2-h1| is the absolute value of the oil height difference between the main oil chamber and each sub-oil chamber, S flowarea is the oil return hole area, g is the acceleration due to gravity.

7. The method according to claim 1, characterized in that The obtaining of the current active pump oil flow of the main oil chamber and the current lubrication flow of each sub-oil chamber includes: Calculating the current active pump oil flow rate of the main oil chamber based on a preset simulation technology; The current lubrication flow rate of each oil sub-chamber is determined according to the operating parameters of the transmission.

8. A device for calculating the oil distribution in a transmission cavity, characterized in that: The transmission inner cavity includes a main oil cavity and at least one sub-oil cavity, wherein the device includes: A first acquisition module is used to acquire the oil height of the main oil chamber and the oil height of each sub-oil chamber, and obtain the oil flow rate between the main oil chamber and each sub-oil chamber according to the oil height of the main oil chamber and the oil height of each sub-oil chamber; a calculation module, configured to calculate a current gravity-driven flow rate of the main oil chamber based on the oil height of the main oil chamber, the oil height of each sub-oil chamber, and the oil flow rate between the main oil chamber and each sub-oil chamber, and to obtain a current active pump oil flow rate of the main oil chamber and a current lubrication flow rate of each sub-oil chamber; The second acquisition module is used to determine the new oil height of the main oil chamber and the new oil height of each sub-oil chamber based on the current gravity-driven flow, the current active pump oil flow and the current lubrication flow, and based on the new oil height of the main oil chamber and the new oil height of each sub-oil chamber, re-execute the step of obtaining the oil flow rate between the main oil chamber and each sub-oil chamber according to the oil height of the main oil chamber and the oil height of each sub-oil chamber, until the new oil height of the main oil chamber and the new oil height of each sub-oil chamber meet the preset stability conditions.

9. A vehicle, characterized in that: The vehicle comprises: a method for calculating the oil distribution in the transmission cavity as described in any one of claims 1 to 7 above.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed, the method according to any one of claims 1 to 7 is implemented.

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